initial setup and convert entity_manipulation

client/src/lib.rs

@@ -1982,12 +1982,14 @@ impl Client {
             &self.connected_server_constants,
             |_, _| {},
         );
+        // TODO: TODO
         // TODO: avoid emitting these in the first place
-        let _ = self
-            .state
-            .ecs()
-            .fetch::<EventBus<common::event::ServerEvent>>()
-            .recv_all();
+        // let _ = self
+        //     .state
+        //     .ecs()
+        //     .fetch::<EventBus<common::event::ServerFrontendEvent>>()
+        //     .recv_all();
+
         // TODO: avoid emitting these in the first place OR actually use outcomes
         // generated locally on the client (if they can be deduplicated from
         // ones that the server generates or if the client can reliably generate

common/src/combat.rs

@@ -14,7 +14,10 @@ use crate::{
         Alignment, Body, Buffs, CharacterState, Combo, Energy, Group, Health, HealthChange,
         Inventory, Ori, Player, Poise, PoiseChange, SkillSet, Stats,
     },
-    event::ServerEvent,
+    event::{
+        BuffEvent, ComboChangeEvent, EmitExt, EnergyChangeEvent, EntityAttackedHookEvent,
+        HealthChangeEvent, KnockbackEvent, ParryHookEvent, PoiseChangeEvent,
+    },
     outcome::Outcome,
     resources::{Secs, Time},
     states::utils::StageSection,
@@ -144,7 +147,7 @@ impl Attack {
         dir: Dir,
         damage: Damage,
         msm: &MaterialStatManifest,
-        mut emit: impl FnMut(ServerEvent),
+        emitters: &mut impl EmitExt<ParryHookEvent>,
         mut emit_outcome: impl FnMut(Outcome),
     ) -> f32 {
         if damage.value > 0.0 {
@@ -164,7 +167,7 @@ impl Attack {
                                 pos: target.pos,
                                 uid: target.uid,
                             });
-                            emit(ServerEvent::ParryHook {
+                            emitters.emit(ParryHookEvent {
                                 defender: target.entity,
                                 attacker: attacker.map(|a| a.entity),
                                 source,
@@ -203,7 +206,16 @@ impl Attack {
         strength_modifier: f32,
         attack_source: AttackSource,
         time: Time,
-        mut emit: impl FnMut(ServerEvent),
+        emitters: &mut (
+                 impl EmitExt<HealthChangeEvent>
+                 + EmitExt<EnergyChangeEvent>
+                 + EmitExt<ParryHookEvent>
+                 + EmitExt<KnockbackEvent>
+                 + EmitExt<BuffEvent>
+                 + EmitExt<PoiseChangeEvent>
+                 + EmitExt<ComboChangeEvent>
+                 + EmitExt<EntityAttackedHookEvent>
+             ),
         mut emit_outcome: impl FnMut(Outcome),
         rng: &mut rand::rngs::ThreadRng,
         damage_instance_offset: u64,
@@ -255,7 +267,7 @@ impl Attack {
                 dir,
                 damage.damage,
                 msm,
-                &mut emit,
+                emitters,
                 &mut emit_outcome,
             );
             let change = damage.damage.calculate_health_change(
@@ -271,7 +283,7 @@ impl Attack {
             accumulated_damage += applied_damage;
 
             if change.amount.abs() > Health::HEALTH_EPSILON {
-                emit(ServerEvent::HealthChange {
+                emitters.emit(HealthChangeEvent {
                     entity: target.entity,
                     change,
                 });
@@ -293,12 +305,12 @@ impl Attack {
                                     precise: precision_mult.is_some(),
                                     instance: damage_instance,
                                 };
-                                emit(ServerEvent::HealthChange {
+                                emitters.emit(HealthChangeEvent {
                                     entity: target.entity,
                                     change: health_change,
                                 });
                             }
-                            emit(ServerEvent::EnergyChange {
+                            emitters.emit(EnergyChangeEvent {
                                 entity: target.entity,
                                 change: -energy_change,
                             });
@@ -344,12 +356,12 @@ impl Attack {
                                     precise: precision_mult.is_some(),
                                     time,
                                 };
-                                emit(ServerEvent::HealthChange {
+                                emitters.emit(HealthChangeEvent {
                                     entity: target.entity,
                                     change: health_change,
                                 });
                             } else {
-                                emit(ServerEvent::PoiseChange {
+                                emitters.emit(PoiseChangeEvent {
                                     entity: target.entity,
                                     change: poise_change,
                                 });
@@ -366,7 +378,7 @@ impl Attack {
                             let impulse =
                                 kb.calculate_impulse(dir, target.char_state) * strength_modifier;
                             if !impulse.is_approx_zero() {
-                                emit(ServerEvent::Knockback {
+                                emitters.emit(KnockbackEvent {
                                     entity: target.entity,
                                     impulse,
                                 });
@@ -374,7 +386,7 @@ impl Attack {
                         },
                         CombatEffect::EnergyReward(ec) => {
                             if let Some(attacker) = attacker {
-                                emit(ServerEvent::EnergyChange {
+                                emitters.emit(EnergyChangeEvent {
                                     entity: attacker.entity,
                                     change: *ec
                                         * compute_energy_reward_mod(attacker.inventory, msm)
@@ -385,7 +397,7 @@ impl Attack {
                         },
                         CombatEffect::Buff(b) => {
                             if rng.gen::<f32>() < b.chance {
-                                emit(ServerEvent::Buff {
+                                emitters.emit(BuffEvent {
                                     entity: target.entity,
                                     buff_change: BuffChange::Add(b.to_buff(
                                         time,
@@ -409,7 +421,7 @@ impl Attack {
                                     instance: rand::random(),
                                 };
                                 if change.amount.abs() > Health::HEALTH_EPSILON {
-                                    emit(ServerEvent::HealthChange {
+                                    emitters.emit(HealthChangeEvent {
                                         entity: attacker_entity,
                                         change,
                                     });
@@ -435,7 +447,7 @@ impl Attack {
                                     cause: Some(damage.damage.source),
                                     time,
                                 };
-                                emit(ServerEvent::PoiseChange {
+                                emitters.emit(PoiseChangeEvent {
                                     entity: target.entity,
                                     change: poise_change,
                                 });
@@ -451,7 +463,7 @@ impl Attack {
                                 instance: rand::random(),
                             };
                             if change.amount.abs() > Health::HEALTH_EPSILON {
-                                emit(ServerEvent::HealthChange {
+                                emitters.emit(HealthChangeEvent {
                                     entity: target.entity,
                                     change,
                                 });
@@ -460,7 +472,7 @@ impl Attack {
                         CombatEffect::Combo(c) => {
                             // Not affected by strength modifier as integer
                             if let Some(attacker_entity) = attacker.map(|a| a.entity) {
-                                emit(ServerEvent::ComboChange {
+                                emitters.emit(ComboChangeEvent {
                                     entity: attacker_entity,
                                     change: *c,
                                 });
@@ -476,7 +488,7 @@ impl Attack {
                                     change.amount *= damage;
                                     change
                                 };
-                                emit(ServerEvent::HealthChange {
+                                emitters.emit(HealthChangeEvent {
                                     entity: target.entity,
                                     change,
                                 });
@@ -484,7 +496,7 @@ impl Attack {
                         },
                         CombatEffect::RefreshBuff(chance, b) => {
                             if rng.gen::<f32>() < *chance {
-                                emit(ServerEvent::Buff {
+                                emitters.emit(BuffEvent {
                                     entity: target.entity,
                                     buff_change: BuffChange::Refresh(*b),
                                 });
@@ -497,7 +509,7 @@ impl Attack {
                                     change.amount *= damage;
                                     change
                                 };
-                                emit(ServerEvent::HealthChange {
+                                emitters.emit(HealthChangeEvent {
                                     entity: target.entity,
                                     change,
                                 });
@@ -510,7 +522,7 @@ impl Attack {
                                     change.amount *= damage;
                                     change
                                 };
-                                emit(ServerEvent::HealthChange {
+                                emitters.emit(HealthChangeEvent {
                                     entity: target.entity,
                                     change,
                                 });
@@ -543,7 +555,7 @@ impl Attack {
                     {
                         let sufficient_energy = e.current() >= *r;
                         if sufficient_energy {
-                            emit(ServerEvent::EnergyChange {
+                            emitters.emit(EnergyChangeEvent {
                                 entity,
                                 change: -*r,
                             });
@@ -563,7 +575,7 @@ impl Attack {
                     {
                         let sufficient_combo = c.counter() >= *r;
                         if sufficient_combo {
-                            emit(ServerEvent::ComboChange {
+                            emitters.emit(ComboChangeEvent {
                                 entity,
                                 change: -(*r as i32),
                             });
@@ -585,7 +597,7 @@ impl Attack {
                         let impulse =
                             kb.calculate_impulse(dir, target.char_state) * strength_modifier;
                         if !impulse.is_approx_zero() {
-                            emit(ServerEvent::Knockback {
+                            emitters.emit(KnockbackEvent {
                                 entity: target.entity,
                                 impulse,
                             });
@@ -593,7 +605,7 @@ impl Attack {
                     },
                     CombatEffect::EnergyReward(ec) => {
                         if let Some(attacker) = attacker {
-                            emit(ServerEvent::EnergyChange {
+                            emitters.emit(EnergyChangeEvent {
                                 entity: attacker.entity,
                                 change: ec
                                     * compute_energy_reward_mod(attacker.inventory, msm)
@@ -604,7 +616,7 @@ impl Attack {
                     },
                     CombatEffect::Buff(b) => {
                         if rng.gen::<f32>() < b.chance {
-                            emit(ServerEvent::Buff {
+                            emitters.emit(BuffEvent {
                                 entity: target.entity,
                                 buff_change: BuffChange::Add(b.to_buff(
                                     time,
@@ -628,7 +640,7 @@ impl Attack {
                                 instance: rand::random(),
                             };
                             if change.amount.abs() > Health::HEALTH_EPSILON {
-                                emit(ServerEvent::HealthChange {
+                                emitters.emit(HealthChangeEvent {
                                     entity: attacker_entity,
                                     change,
                                 });
@@ -654,7 +666,7 @@ impl Attack {
                                 cause: Some(attack_source.into()),
                                 time,
                             };
-                            emit(ServerEvent::PoiseChange {
+                            emitters.emit(PoiseChangeEvent {
                                 entity: target.entity,
                                 change: poise_change,
                             });
@@ -670,7 +682,7 @@ impl Attack {
                             instance: rand::random(),
                         };
                         if change.amount.abs() > Health::HEALTH_EPSILON {
-                            emit(ServerEvent::HealthChange {
+                            emitters.emit(HealthChangeEvent {
                                 entity: target.entity,
                                 change,
                             });
@@ -679,7 +691,7 @@ impl Attack {
                     CombatEffect::Combo(c) => {
                         // Not affected by strength modifier as integer
                         if let Some(attacker_entity) = attacker.map(|a| a.entity) {
-                            emit(ServerEvent::ComboChange {
+                            emitters.emit(ComboChangeEvent {
                                 entity: attacker_entity,
                                 change: c,
                             });
@@ -689,7 +701,7 @@ impl Attack {
                     CombatEffect::StageVulnerable(_, _) => {},
                     CombatEffect::RefreshBuff(chance, b) => {
                         if rng.gen::<f32>() < chance {
-                            emit(ServerEvent::Buff {
+                            emitters.emit(BuffEvent {
                                 entity: target.entity,
                                 buff_change: BuffChange::Refresh(b),
                             });
@@ -704,7 +716,7 @@ impl Attack {
         // Emits event to handle things that should happen for any successful attack,
         // regardless of if the attack had any damages or effects in it
         if is_applied {
-            emit(ServerEvent::EntityAttackedHook {
+            emitters.emit(EntityAttackedHookEvent {
                 entity: target.entity,
                 attacker: attacker.map(|a| a.entity),
             });

common/src/comp/character_state.rs

@@ -4,7 +4,8 @@ use crate::{
         ability::Capability, inventory::item::armor::Friction, item::ConsumableKind, ControlAction,
         Density, Energy, InputAttr, InputKind, Ori, Pos, Vel,
     },
-    event::{LocalEvent, ServerEvent},
+    event::{self, EmitExt, LocalEvent},
+    event_emitters,
     resources::Time,
     states::{
         self,
@@ -34,19 +35,46 @@ pub struct StateUpdate {
     pub character_activity: CharacterActivity,
 }
 
-pub struct OutputEvents<'a> {
-    local: &'a mut Vec<LocalEvent>,
-    server: &'a mut Vec<ServerEvent>,
+event_emitters! {
+    pub struct CharacterStateEvents[CharacterStateEventEmitters] {
+        combo: event::ComboChangeEvent,
+        event: event::AuraEvent,
+        shoot: event::ShootEvent,
+        teleport_to: event::TeleportToEvent,
+        shockwave: event::ShockwaveEvent,
+        explosion: event::ExplosionEvent,
+        buff: event::BuffEvent,
+        inventory_manip: event::InventoryManipEvent,
+        sprite_summon: event::CreateSpriteEvent,
+        change_stance: event::ChangeStanceEvent,
+        create_npc: event::CreateNpcEvent,
+        energy_change: event::EnergyChangeEvent,
+        knockback: event::KnockbackEvent,
+        sprite_light: event::ToggleSpriteLightEvent,
+    }
 }
 
-impl<'a> OutputEvents<'a> {
-    pub fn new(local: &'a mut Vec<LocalEvent>, server: &'a mut Vec<ServerEvent>) -> Self {
+pub struct OutputEvents<'a, 'b> {
+    local: &'a mut Vec<LocalEvent>,
+    server: &'a mut CharacterStateEventEmitters<'b>,
+}
+
+impl<'a, 'b: 'a> OutputEvents<'a, 'b> {
+    pub fn new(
+        local: &'a mut Vec<LocalEvent>,
+        server: &'a mut CharacterStateEventEmitters<'b>,
+    ) -> Self {
         Self { local, server }
     }
 
     pub fn emit_local(&mut self, event: LocalEvent) { self.local.push(event); }
 
-    pub fn emit_server(&mut self, event: ServerEvent) { self.server.push(event); }
+    pub fn emit_server<E>(&mut self, event: E)
+    where
+        CharacterStateEventEmitters<'b>: EmitExt<E>,
+    {
+        self.server.emit(event);
+    }
 }
 
 impl From<&JoinData<'_>> for StateUpdate {

common/src/comp/chat.rs

@@ -217,6 +217,13 @@ impl<G> GenericChatMsg<G> {
         Self { chat_type, content }
     }
 
+    pub fn death(kill_source: KillSource, victim: Uid) -> Self {
+        Self {
+            chat_type: ChatType::Kill(kill_source, victim),
+            content: Content::Plain(String::new()),
+        }
+    }
+
     pub fn map_group<T>(self, mut f: impl FnMut(G) -> T) -> GenericChatMsg<T> {
         let chat_type = match self.chat_type {
             ChatType::Online(a) => ChatType::Online(a),

common/src/comp/group.rs

@@ -2,7 +2,7 @@ use crate::{comp::Alignment, uid::Uid};
 use hashbrown::HashMap;
 use serde::{Deserialize, Serialize};
 use slab::Slab;
-use specs::{Component, DerefFlaggedStorage, Join, LendJoin};
+use specs::{storage::GenericReadStorage, Component, DerefFlaggedStorage, Join, LendJoin};
 use tracing::{error, warn};
 
 // Primitive group system
@@ -82,7 +82,6 @@ impl<E> ChangeNotification<E> {
 }
 
 type GroupsMut<'a> = specs::WriteStorage<'a, Group>;
-type Groups<'a> = specs::ReadStorage<'a, Group>;
 type Alignments<'a> = specs::ReadStorage<'a, Alignment>;
 type Uids<'a> = specs::ReadStorage<'a, Uid>;
 
@@ -98,7 +97,7 @@ fn pets(
     entity: specs::Entity,
     uid: Uid,
     alignments: &Alignments,
-    entities: &specs::Entities,
+    entities: &specs::world::EntitiesRes,
 ) -> Vec<specs::Entity> {
     (entities, alignments)
         .join()
@@ -112,7 +111,7 @@ fn pets(
 pub fn members<'a>(
     group: Group,
     groups: impl Join<Type = &'a Group> + 'a,
-    entities: &'a specs::Entities,
+    entities: &'a specs::world::EntitiesRes,
     alignments: &'a Alignments,
     uids: &'a Uids,
 ) -> impl Iterator<Item = (specs::Entity, Role)> + 'a {
@@ -331,7 +330,7 @@ impl GroupManager {
         groups: &mut GroupsMut,
         alignments: &Alignments,
         uids: &Uids,
-        entities: &specs::Entities,
+        entities: &specs::world::EntitiesRes,
         notifier: &mut impl FnMut(specs::Entity, ChangeNotification<specs::Entity>),
     ) {
         self.remove_from_group(member, groups, alignments, uids, entities, notifier, true);
@@ -346,7 +345,7 @@ impl GroupManager {
         groups: &mut GroupsMut,
         alignments: &Alignments,
         uids: &Uids,
-        entities: &specs::Entities,
+        entities: &specs::world::EntitiesRes,
         notifier: &mut impl FnMut(specs::Entity, ChangeNotification<specs::Entity>),
         to_be_deleted: bool,
     ) {
@@ -493,13 +492,13 @@ impl GroupManager {
 
     // Assign new group leader
     // Does nothing if new leader is not part of a group
-    pub fn assign_leader(
+    pub fn assign_leader<'a>(
         &mut self,
         new_leader: specs::Entity,
-        groups: &Groups,
-        entities: &specs::Entities,
-        alignments: &Alignments,
-        uids: &Uids,
+        groups: impl GenericReadStorage<Component = Group> + Join<Type = &'a Group> + 'a,
+        entities: &'a specs::Entities,
+        alignments: &'a Alignments,
+        uids: &'a Uids,
         mut notifier: impl FnMut(specs::Entity, ChangeNotification<specs::Entity>),
     ) {
         let group = match groups.get(new_leader) {

common/src/event.rs

@@ -7,7 +7,7 @@ use crate::{
         dialogue::Subject,
         invite::{InviteKind, InviteResponse},
         misc::PortalData,
-        DisconnectReason, Ori, Pos,
+        DisconnectReason, LootOwner, Ori, Pos, UnresolvedChatMsg, Vel,
     },
     lottery::LootSpec,
     mounting::VolumePos,
@@ -20,7 +20,7 @@ use crate::{
     Explosion,
 };
 use serde::{Deserialize, Serialize};
-use specs::Entity as EcsEntity;
+use specs::{Entity as EcsEntity, World};
 use std::{collections::VecDeque, ops::DerefMut, sync::Mutex};
 use uuid::Uuid;
 use vek::*;
@@ -132,82 +132,145 @@ impl NpcBuilder {
     }
 }
 
-#[allow(clippy::large_enum_variant)] // TODO: Pending review in #587
-#[derive(strum::EnumDiscriminants)]
-#[strum_discriminants(repr(usize))]
-#[strum_discriminants(derive(strum::EnumVariantNames))]
-pub enum ServerEvent {
-    Explosion {
-        pos: Vec3<f32>,
-        explosion: Explosion,
-        owner: Option<Uid>,
-    },
-    Bonk {
-        pos: Vec3<f32>,
-        owner: Option<Uid>,
-        target: Option<Uid>,
-    },
-    HealthChange {
-        entity: EcsEntity,
-        change: comp::HealthChange,
-    },
-    PoiseChange {
-        entity: EcsEntity,
-        change: comp::PoiseChange,
-    },
-    Delete(EcsEntity),
-    Destroy {
-        entity: EcsEntity,
-        cause: comp::HealthChange,
-    },
-    InventoryManip(EcsEntity, comp::InventoryManip),
-    GroupManip(EcsEntity, comp::GroupManip),
-    Respawn(EcsEntity),
-    Shoot {
-        entity: EcsEntity,
-        pos: Pos,
-        dir: Dir,
-        body: comp::Body,
-        light: Option<comp::LightEmitter>,
-        projectile: comp::Projectile,
-        speed: f32,
-        object: Option<comp::Object>,
-    },
-    Shockwave {
-        properties: comp::shockwave::Properties,
-        pos: Pos,
-        ori: Ori,
-    },
-    Knockback {
-        entity: EcsEntity,
-        impulse: Vec3<f32>,
-    },
-    LandOnGround {
-        entity: EcsEntity,
-        vel: Vec3<f32>,
-        surface_normal: Vec3<f32>,
-    },
-    EnableLantern(EcsEntity),
-    DisableLantern(EcsEntity),
-    NpcInteract(EcsEntity, EcsEntity, Subject),
-    InviteResponse(EcsEntity, InviteResponse),
-    InitiateInvite(EcsEntity, Uid, InviteKind),
-    ProcessTradeAction(EcsEntity, TradeId, TradeAction),
-    Mount(EcsEntity, EcsEntity),
-    MountVolume(EcsEntity, VolumePos),
-    Unmount(EcsEntity),
-    SetPetStay(EcsEntity, EcsEntity, bool),
-    Possess(Uid, Uid),
-    /// Inserts default components for a character when loading into the game
-    InitCharacterData {
-        entity: EcsEntity,
-        character_id: CharacterId,
-        requested_view_distances: crate::ViewDistances,
-    },
-    InitSpectator(EcsEntity, crate::ViewDistances),
-    UpdateCharacterData {
-        entity: EcsEntity,
-        components: (
+pub struct ClientConnectedEvent {
+    pub entity: EcsEntity,
+}
+pub struct ClientDisconnectEvent(pub EcsEntity, pub DisconnectReason);
+pub struct ClientDisconnectWithoutPersistenceEvent(pub EcsEntity);
+
+pub struct ChatEvent(pub UnresolvedChatMsg);
+pub struct CommandEvent(pub EcsEntity, pub String, pub Vec<String>);
+
+// Entity Creation
+pub struct CreateWaypointEvent(pub Vec3<f32>);
+pub struct CreateTeleporterEvent(pub Vec3<f32>, pub PortalData);
+
+pub struct CreateNpcEvent {
+    pub pos: Pos,
+    pub ori: Ori,
+    pub npc: NpcBuilder,
+    pub rider: Option<NpcBuilder>,
+}
+
+pub struct CreateShipEvent {
+    pub pos: Pos,
+    pub ori: Ori,
+    pub ship: comp::ship::Body,
+    pub rtsim_entity: Option<RtSimEntity>,
+    pub driver: Option<NpcBuilder>,
+}
+
+pub struct CreateItemDropEvent {
+    pub pos: Pos,
+    pub vel: Vel,
+    pub ori: Ori,
+    pub item: comp::Item,
+    pub loot_owner: Option<LootOwner>,
+}
+pub struct CreateObjectEvent {
+    pub pos: Pos,
+    pub vel: Vel,
+    pub body: comp::object::Body,
+    pub object: Option<comp::Object>,
+    pub item: Option<comp::Item>,
+    pub light_emitter: Option<comp::LightEmitter>,
+    pub stats: Option<comp::Stats>,
+}
+
+pub struct ExplosionEvent {
+    pub pos: Vec3<f32>,
+    pub explosion: Explosion,
+    pub owner: Option<Uid>,
+}
+
+pub struct BonkEvent {
+    pub pos: Vec3<f32>,
+    pub owner: Option<Uid>,
+    pub target: Option<Uid>,
+}
+
+pub struct HealthChangeEvent {
+    pub entity: EcsEntity,
+    pub change: comp::HealthChange,
+}
+
+pub struct PoiseChangeEvent {
+    pub entity: EcsEntity,
+    pub change: comp::PoiseChange,
+}
+
+pub struct DeleteEvent(pub EcsEntity);
+
+pub struct DestroyEvent {
+    pub entity: EcsEntity,
+    pub cause: comp::HealthChange,
+}
+
+pub struct InventoryManipEvent(pub EcsEntity, pub comp::InventoryManip);
+
+pub struct GroupManipEvent(pub EcsEntity, pub comp::GroupManip);
+
+pub struct RespawnEvent(pub EcsEntity);
+
+pub struct ShootEvent {
+    pub entity: EcsEntity,
+    pub pos: Pos,
+    pub dir: Dir,
+    pub body: comp::Body,
+    pub light: Option<comp::LightEmitter>,
+    pub projectile: comp::Projectile,
+    pub speed: f32,
+    pub object: Option<comp::Object>,
+}
+
+pub struct ShockwaveEvent {
+    pub properties: comp::shockwave::Properties,
+    pub pos: Pos,
+    pub ori: Ori,
+}
+
+pub struct KnockbackEvent {
+    pub entity: EcsEntity,
+    pub impulse: Vec3<f32>,
+}
+
+pub struct LandOnGroundEvent {
+    pub entity: EcsEntity,
+    pub vel: Vec3<f32>,
+    pub surface_normal: Vec3<f32>,
+}
+
+pub struct SetLanternEvent(pub EcsEntity, pub bool);
+
+pub struct NpcInteractEvent(pub EcsEntity, pub EcsEntity, pub Subject);
+
+pub struct InviteResponseEvent(pub EcsEntity, pub InviteResponse);
+
+pub struct InitiateInviteEvent(pub EcsEntity, pub Uid, pub InviteKind);
+
+pub struct ProcessTradeActionEvent(pub EcsEntity, pub TradeId, pub TradeAction);
+
+pub struct MountEvent(pub EcsEntity, pub EcsEntity);
+
+pub struct MountVolumeEvent(pub EcsEntity, pub VolumePos);
+
+pub struct UnmountEvent(pub EcsEntity);
+
+pub struct SetPetStayEvent(pub EcsEntity, pub EcsEntity, pub bool);
+
+pub struct PossessEvent(pub Uid, pub Uid);
+
+pub struct InitializeCharacterEvent {
+    pub entity: EcsEntity,
+    pub character_id: CharacterId,
+    pub requested_view_distances: crate::ViewDistances,
+}
+
+pub struct InitializeSpectatorEvent(pub EcsEntity, pub crate::ViewDistances);
+
+pub struct UpdateCharacterDataEvent {
+    pub entity: EcsEntity,
+    pub components: (
         comp::Body,
         comp::Stats,
         comp::SkillSet,
@@ -217,132 +280,133 @@ pub enum ServerEvent {
         comp::ActiveAbilities,
         Option<comp::MapMarker>,
     ),
-        metadata: UpdateCharacterMetadata,
-    },
-    ExitIngame {
-        entity: EcsEntity,
-    },
-    // TODO: to avoid breakage when adding new fields, perhaps have an `NpcBuilder` type?
-    CreateNpc {
-        pos: Pos,
-        ori: Ori,
-        npc: NpcBuilder,
-        rider: Option<NpcBuilder>,
-    },
-    CreateShip {
-        pos: Pos,
-        ori: Ori,
-        ship: comp::ship::Body,
-        rtsim_entity: Option<RtSimEntity>,
-        driver: Option<NpcBuilder>,
-    },
-    CreateWaypoint(Vec3<f32>),
-    CreateTeleporter(Vec3<f32>, PortalData),
-    ClientDisconnect(EcsEntity, DisconnectReason),
-    ClientDisconnectWithoutPersistence(EcsEntity),
-    Command(EcsEntity, String, Vec<String>),
-    /// Send a chat message to the player from an npc or other player
-    Chat(comp::UnresolvedChatMsg),
-    Aura {
-        entity: EcsEntity,
-        aura_change: comp::AuraChange,
-    },
-    Buff {
-        entity: EcsEntity,
-        buff_change: comp::BuffChange,
-    },
-    EnergyChange {
-        entity: EcsEntity,
-        change: f32,
-    },
-    ComboChange {
-        entity: EcsEntity,
-        change: i32,
-    },
-    ParryHook {
-        defender: EcsEntity,
-        attacker: Option<EcsEntity>,
-        source: AttackSource,
-    },
-    RequestSiteInfo {
-        entity: EcsEntity,
-        id: SiteId,
-    },
+    pub metadata: UpdateCharacterMetadata,
+}
+
+pub struct ExitIngameEvent {
+    pub entity: EcsEntity,
+}
+
+pub struct AuraEvent {
+    pub entity: EcsEntity,
+    pub aura_change: comp::AuraChange,
+}
+
+pub struct BuffEvent {
+    pub entity: EcsEntity,
+    pub buff_change: comp::BuffChange,
+}
+
+pub struct EnergyChangeEvent {
+    pub entity: EcsEntity,
+    pub change: f32,
+}
+
+pub struct ComboChangeEvent {
+    pub entity: EcsEntity,
+    pub change: i32,
+}
+
+pub struct ParryHookEvent {
+    pub defender: EcsEntity,
+    pub attacker: Option<EcsEntity>,
+    pub source: AttackSource,
+}
+
+pub struct RequestSiteInfoEvent {
+    pub entity: EcsEntity,
+    pub id: SiteId,
+}
+
 // Attempt to mine a block, turning it into an item
-    MineBlock {
-        entity: EcsEntity,
-        pos: Vec3<i32>,
-        tool: Option<comp::tool::ToolKind>,
-    },
-    TeleportTo {
-        entity: EcsEntity,
-        target: Uid,
-        max_range: Option<f32>,
-    },
-    CreateSafezone {
-        range: Option<f32>,
-        pos: Pos,
-    },
-    Sound {
-        sound: Sound,
-    },
-    CreateSprite {
-        pos: Vec3<i32>,
-        sprite: SpriteKind,
-        del_timeout: Option<(f32, f32)>,
-    },
-    TamePet {
-        pet_entity: EcsEntity,
-        owner_entity: EcsEntity,
-    },
-    EntityAttackedHook {
-        entity: EcsEntity,
-        attacker: Option<EcsEntity>,
-    },
-    ChangeAbility {
-        entity: EcsEntity,
-        slot: usize,
-        auxiliary_key: comp::ability::AuxiliaryKey,
-        new_ability: comp::ability::AuxiliaryAbility,
-    },
-    UpdateMapMarker {
-        entity: EcsEntity,
-        update: comp::MapMarkerChange,
-    },
-    MakeAdmin {
-        entity: EcsEntity,
-        admin: comp::Admin,
-        uuid: Uuid,
-    },
-    DeleteCharacter {
-        entity: EcsEntity,
-        requesting_player_uuid: String,
-        character_id: CharacterId,
-    },
-    ChangeStance {
-        entity: EcsEntity,
-        stance: comp::Stance,
-    },
-    ChangeBody {
-        entity: EcsEntity,
-        new_body: comp::Body,
-    },
-    RemoveLightEmitter {
-        entity: EcsEntity,
-    },
-    TeleportToPosition {
-        entity: EcsEntity,
-        position: Vec3<f32>,
-    },
-    StartTeleporting {
-        entity: EcsEntity,
-        portal: EcsEntity,
-    },
-    ToggleSpriteLight {
-        entity: EcsEntity,
-        pos: Vec3<i32>,
-        enable: bool,
-    },
+pub struct MineBlockEvent {
+    pub entity: EcsEntity,
+    pub pos: Vec3<i32>,
+    pub tool: Option<comp::tool::ToolKind>,
+}
+
+pub struct TeleportToEvent {
+    pub entity: EcsEntity,
+    pub target: Uid,
+    pub max_range: Option<f32>,
+}
+
+pub struct CreateSafezoneEvent {
+    pub range: Option<f32>,
+    pub pos: Pos,
+}
+
+pub struct SoundEvent {
+    pub sound: Sound,
+}
+
+pub struct CreateSpriteEvent {
+    pub pos: Vec3<i32>,
+    pub sprite: SpriteKind,
+    pub del_timeout: Option<(f32, f32)>,
+}
+
+pub struct TamePetEvent {
+    pub pet_entity: EcsEntity,
+    pub owner_entity: EcsEntity,
+}
+
+pub struct EntityAttackedHookEvent {
+    pub entity: EcsEntity,
+    pub attacker: Option<EcsEntity>,
+}
+
+pub struct ChangeAbilityEvent {
+    pub entity: EcsEntity,
+    pub slot: usize,
+    pub auxiliary_key: comp::ability::AuxiliaryKey,
+    pub new_ability: comp::ability::AuxiliaryAbility,
+}
+
+pub struct UpdateMapMarkerEvent {
+    pub entity: EcsEntity,
+    pub update: comp::MapMarkerChange,
+}
+
+pub struct MakeAdminEvent {
+    pub entity: EcsEntity,
+    pub admin: comp::Admin,
+    pub uuid: Uuid,
+}
+
+pub struct DeleteCharacterEvent {
+    pub entity: EcsEntity,
+    pub requesting_player_uuid: String,
+    pub character_id: CharacterId,
+}
+
+pub struct ChangeStanceEvent {
+    pub entity: EcsEntity,
+    pub stance: comp::Stance,
+}
+
+pub struct ChangeBodyEvent {
+    pub entity: EcsEntity,
+    pub new_body: comp::Body,
+}
+
+pub struct RemoveLightEmitterEvent {
+    pub entity: EcsEntity,
+}
+
+pub struct TeleportToPositionEvent {
+    pub entity: EcsEntity,
+    pub position: Vec3<f32>,
+}
+
+pub struct StartTeleportingEvent {
+    pub entity: EcsEntity,
+    pub portal: EcsEntity,
+}
+pub struct ToggleSpriteLightEvent {
+    pub entity: EcsEntity,
+    pub pos: Vec3<i32>,
+    pub enable: bool,
 }
 
 pub struct EventBus<E> {
@@ -370,11 +434,15 @@ impl<E> EventBus<E> {
     pub fn recv_all(&self) -> impl ExactSizeIterator<Item = E> {
         std::mem::take(self.queue.lock().unwrap().deref_mut()).into_iter()
     }
+
+    pub fn recv_all_mut(&mut self) -> impl ExactSizeIterator<Item = E> {
+        std::mem::take(self.queue.get_mut().unwrap()).into_iter()
+    }
 }
 
 pub struct Emitter<'a, E> {
     bus: &'a EventBus<E>,
-    events: VecDeque<E>,
+    pub events: VecDeque<E>,
 }
 
 impl<'a, E> Emitter<'a, E> {
@@ -395,3 +463,134 @@ impl<'a, E> Drop for Emitter<'a, E> {
         }
     }
 }
+
+pub trait EmitExt<E> {
+    fn emit(&mut self, event: E);
+    fn emit_many(&mut self, events: impl IntoIterator<Item = E>);
+}
+
+pub fn register_event_busses(ecs: &mut World) {
+    ecs.insert(EventBus::<ClientConnectedEvent>::default());
+    ecs.insert(EventBus::<ClientDisconnectEvent>::default());
+    ecs.insert(EventBus::<ClientDisconnectWithoutPersistenceEvent>::default());
+    ecs.insert(EventBus::<ChatEvent>::default());
+    ecs.insert(EventBus::<CommandEvent>::default());
+    ecs.insert(EventBus::<CreateWaypointEvent>::default());
+    ecs.insert(EventBus::<CreateTeleporterEvent>::default());
+    ecs.insert(EventBus::<CreateNpcEvent>::default());
+    ecs.insert(EventBus::<CreateShipEvent>::default());
+    ecs.insert(EventBus::<CreateItemDropEvent>::default());
+    ecs.insert(EventBus::<CreateObjectEvent>::default());
+    ecs.insert(EventBus::<ExplosionEvent>::default());
+    ecs.insert(EventBus::<BonkEvent>::default());
+    ecs.insert(EventBus::<HealthChangeEvent>::default());
+    ecs.insert(EventBus::<PoiseChangeEvent>::default());
+    ecs.insert(EventBus::<DeleteEvent>::default());
+    ecs.insert(EventBus::<DestroyEvent>::default());
+    ecs.insert(EventBus::<InventoryManipEvent>::default());
+    ecs.insert(EventBus::<GroupManipEvent>::default());
+    ecs.insert(EventBus::<RespawnEvent>::default());
+    ecs.insert(EventBus::<ShootEvent>::default());
+    ecs.insert(EventBus::<ShockwaveEvent>::default());
+    ecs.insert(EventBus::<KnockbackEvent>::default());
+    ecs.insert(EventBus::<LandOnGroundEvent>::default());
+    ecs.insert(EventBus::<SetLanternEvent>::default());
+    ecs.insert(EventBus::<NpcInteractEvent>::default());
+    ecs.insert(EventBus::<InviteResponseEvent>::default());
+    ecs.insert(EventBus::<InitiateInviteEvent>::default());
+    ecs.insert(EventBus::<ProcessTradeActionEvent>::default());
+    ecs.insert(EventBus::<MountEvent>::default());
+    ecs.insert(EventBus::<MountVolumeEvent>::default());
+    ecs.insert(EventBus::<UnmountEvent>::default());
+    ecs.insert(EventBus::<SetPetStayEvent>::default());
+    ecs.insert(EventBus::<PossessEvent>::default());
+    ecs.insert(EventBus::<InitializeCharacterEvent>::default());
+    ecs.insert(EventBus::<InitializeSpectatorEvent>::default());
+    ecs.insert(EventBus::<UpdateCharacterDataEvent>::default());
+    ecs.insert(EventBus::<ExitIngameEvent>::default());
+    ecs.insert(EventBus::<AuraEvent>::default());
+    ecs.insert(EventBus::<BuffEvent>::default());
+    ecs.insert(EventBus::<EnergyChangeEvent>::default());
+    ecs.insert(EventBus::<ComboChangeEvent>::default());
+    ecs.insert(EventBus::<ParryHookEvent>::default());
+    ecs.insert(EventBus::<RequestSiteInfoEvent>::default());
+    ecs.insert(EventBus::<MineBlockEvent>::default());
+    ecs.insert(EventBus::<TeleportToEvent>::default());
+    ecs.insert(EventBus::<CreateSafezoneEvent>::default());
+    ecs.insert(EventBus::<SoundEvent>::default());
+    ecs.insert(EventBus::<CreateSpriteEvent>::default());
+    ecs.insert(EventBus::<TamePetEvent>::default());
+    ecs.insert(EventBus::<EntityAttackedHookEvent>::default());
+    ecs.insert(EventBus::<ChangeAbilityEvent>::default());
+    ecs.insert(EventBus::<UpdateMapMarkerEvent>::default());
+    ecs.insert(EventBus::<MakeAdminEvent>::default());
+    ecs.insert(EventBus::<DeleteCharacterEvent>::default());
+    ecs.insert(EventBus::<ChangeStanceEvent>::default());
+    ecs.insert(EventBus::<ChangeBodyEvent>::default());
+    ecs.insert(EventBus::<RemoveLightEmitterEvent>::default());
+    ecs.insert(EventBus::<TeleportToPositionEvent>::default());
+    ecs.insert(EventBus::<StartTeleportingEvent>::default());
+    ecs.insert(EventBus::<ToggleSpriteLightEvent>::default());
+}
+
+/// Define ecs read data for event busses. And a way to convert them all to
+/// emitters.
+///
+/// # Example:
+/// ```
+/// struct Foo;
+/// struct Bar;
+/// struct Baz;
+/// event_emitters!(
+///     pub struct ReadEvents[EventEmitters] {
+///         foo: Foo, bar: Bar, baz: Baz,
+///     }
+/// );
+/// ```
+#[macro_export]
+macro_rules! event_emitters {
+    ($($vis:vis struct $read_data:ident[$emitters:ident] { $($ev_ident:ident: $ty:ty),+ $(,)? })+) => {
+        mod event_emitters {
+            use super::*;
+            use specs::shred;
+            $(
+            #[derive(specs::SystemData)]
+            pub struct $read_data<'a> {
+                $($ev_ident: specs::Read<'a, $crate::event::EventBus<$ty>>),+
+            }
+
+            impl<'a> $read_data<'a> {
+                #[allow(unused)]
+                pub fn get_emitters(&self) -> $emitters {
+                    $emitters {
+                        $($ev_ident: self.$ev_ident.emitter()),+
+                    }
+                }
+            }
+
+            pub struct $emitters<'a> {
+                $($ev_ident: $crate::event::Emitter<'a, $ty>),+
+            }
+
+            impl<'a> $emitters<'a> {
+                #[allow(unused)]
+                pub fn append(&mut self, mut other: Self) {
+                    $(
+                        self.$ev_ident.append(&mut other.$ev_ident.events);
+                    )+
+                }
+            }
+
+            $(
+                impl<'a> $crate::event::EmitExt<$ty> for $emitters<'a> {
+                    fn emit(&mut self, event: $ty) { self.$ev_ident.emit(event) }
+                    fn emit_many(&mut self, events: impl IntoIterator<Item = $ty>) { self.$ev_ident.emit_many(events) }
+                }
+            )+
+            )+
+        }
+        $(
+            $vis use event_emitters::{$read_data, $emitters};
+        )+
+    }
+}

common/src/states/basic_aura.rs

@@ -5,7 +5,7 @@ use crate::{
         character_state::OutputEvents,
         CharacterState, StateUpdate,
     },
-    event::ServerEvent,
+    event::{AuraEvent, ComboChangeEvent},
     resources::Secs,
     states::{
         behavior::{CharacterBehavior, JoinData},
@@ -95,12 +95,12 @@ impl CharacterBehavior for Data {
                                         (self.static_data.combo_at_cast.max(1) as f32).sqrt();
                                 },
                             }
-                            output_events.emit_server(ServerEvent::ComboChange {
+                            output_events.emit_server(ComboChangeEvent {
                                 entity: data.entity,
                                 change: -(self.static_data.combo_at_cast as i32),
                             });
                         }
-                        output_events.emit_server(ServerEvent::Aura {
+                        output_events.emit_server(AuraEvent {
                             entity: data.entity,
                             aura_change: AuraChange::Add(aura),
                         });

common/src/states/basic_ranged.rs

@@ -5,7 +5,7 @@ use crate::{
         object::Body::{GrenadeClay, LaserBeam},
         Body, CharacterState, LightEmitter, Pos, ProjectileConstructor, StateUpdate,
     },
-    event::{LocalEvent, ServerEvent},
+    event::{LocalEvent, ShootEvent},
     outcome::Outcome,
     states::{
         behavior::{CharacterBehavior, JoinData},
@@ -127,7 +127,7 @@ impl CharacterBehavior for Data {
                         }))
                         .unwrap_or(data.inputs.look_dir);
                         // Tells server to create and shoot the projectile
-                        output_events.emit_server(ServerEvent::Shoot {
+                        output_events.emit_server(ShootEvent {
                             entity: data.entity,
                             pos,
                             dir,

common/src/states/basic_summon.rs

@@ -9,7 +9,7 @@ use crate::{
         Body::Object,
         CharacterState, Projectile, StateUpdate,
     },
-    event::{LocalEvent, NpcBuilder, ServerEvent},
+    event::{CreateNpcEvent, LocalEvent, NpcBuilder},
     npc::NPC_NAMES,
     outcome::Outcome,
     skillset_builder::{self, SkillSetBuilder},
@@ -197,7 +197,7 @@ impl CharacterBehavior for Data {
 
                         let mut rng = rand::thread_rng();
                         // Send server event to create npc
-                        output_events.emit_server(ServerEvent::CreateNpc {
+                        output_events.emit_server(CreateNpcEvent {
                             pos: comp::Pos(
                                 collision_vector - Vec3::unit_z() * obstacle_z + extra_height,
                             ),

common/src/states/blink.rs

@@ -1,6 +1,6 @@
 use crate::{
     comp::{character_state::OutputEvents, CharacterState, StateUpdate},
-    event::ServerEvent,
+    event::TeleportToEvent,
     states::{
         behavior::{CharacterBehavior, JoinData},
         utils::*,
@@ -52,7 +52,7 @@ impl CharacterBehavior for Data {
                     // provided
                     if let Some(input_attr) = self.static_data.ability_info.input_attr {
                         if let Some(target) = input_attr.target_entity {
-                            output_events.emit_server(ServerEvent::TeleportTo {
+                            output_events.emit_server(TeleportToEvent {
                                 entity: data.entity,
                                 target,
                                 max_range: Some(self.static_data.max_range),

common/src/states/charged_ranged.rs

@@ -4,7 +4,7 @@ use crate::{
         character_state::OutputEvents, projectile::ProjectileConstructor, Body, CharacterState,
         LightEmitter, Pos, StateUpdate,
     },
-    event::ServerEvent,
+    event::ShootEvent,
     states::{
         behavior::{CharacterBehavior, JoinData},
         utils::*,
@@ -123,7 +123,7 @@ impl CharacterBehavior for Data {
                         tool_stats,
                         self.static_data.damage_effect,
                     );
-                    output_events.emit_server(ServerEvent::Shoot {
+                    output_events.emit_server(ShootEvent {
                         entity: data.entity,
                         pos,
                         dir: data.inputs.look_dir,

common/src/states/leap_shockwave.rs

@@ -9,7 +9,7 @@ use crate::{
         shockwave::{self, ShockwaveDodgeable},
         CharacterState, StateUpdate,
     },
-    event::{LocalEvent, ServerEvent},
+    event::{ExplosionEvent, LocalEvent, ShockwaveEvent},
     outcome::Outcome,
     states::{
         behavior::{CharacterBehavior, JoinData},
@@ -182,7 +182,7 @@ impl CharacterBehavior for Data {
                         owner: Some(*data.uid),
                         specifier: self.static_data.specifier,
                     };
-                    output_events.emit_server(ServerEvent::Shockwave {
+                    output_events.emit_server(ShockwaveEvent {
                         properties,
                         pos: *data.pos,
                         ori: *data.ori,
@@ -214,7 +214,7 @@ impl CharacterBehavior for Data {
                                 reagent: Some(Reagent::White),
                                 min_falloff: 0.5,
                             };
-                            output_events.emit_server(ServerEvent::Explosion {
+                            output_events.emit_server(ExplosionEvent {
                                 pos: data.pos.0,
                                 explosion,
                                 owner: Some(*data.uid),

common/src/states/rapid_melee.rs

@@ -1,7 +1,7 @@
 use crate::{
     combat,
     comp::{character_state::OutputEvents, CharacterState, MeleeConstructor, StateUpdate},
-    event::ServerEvent,
+    event::ComboChangeEvent,
     states::{
         behavior::{CharacterBehavior, JoinData},
         utils::*,
@@ -117,7 +117,7 @@ impl CharacterBehavior for Data {
 
                 // Consume combo if any was required
                 if self.static_data.minimum_combo > 0 {
-                    output_events.emit_server(ServerEvent::ComboChange {
+                    output_events.emit_server(ComboChangeEvent {
                         entity: data.entity,
                         change: -data.combo.map_or(0, |c| c.counter() as i32),
                     });

common/src/states/repeater_ranged.rs

@@ -4,7 +4,7 @@ use crate::{
         character_state::OutputEvents, Body, CharacterState, LightEmitter, Pos,
         ProjectileConstructor, StateUpdate,
     },
-    event::ServerEvent,
+    event::{EnergyChangeEvent, ShootEvent},
     states::{
         behavior::{CharacterBehavior, JoinData},
         utils::{StageSection, *},
@@ -144,7 +144,7 @@ impl CharacterBehavior for Data {
                         tool_stats,
                         self.static_data.damage_effect,
                     );
-                    output_events.emit_server(ServerEvent::Shoot {
+                    output_events.emit_server(ShootEvent {
                         entity: data.entity,
                         pos,
                         dir: direction,
@@ -156,7 +156,7 @@ impl CharacterBehavior for Data {
                     });
 
                     // Removes energy from character when arrow is fired
-                    output_events.emit_server(ServerEvent::EnergyChange {
+                    output_events.emit_server(EnergyChangeEvent {
                         entity: data.entity,
                         change: -self.static_data.energy_cost,
                     });

common/src/states/roll.rs

@@ -4,7 +4,7 @@ use crate::{
         character_state::{AttackFilters, OutputEvents},
         CharacterState, StateUpdate,
     },
-    event::ServerEvent,
+    event::BuffEvent,
     states::{
         behavior::{CharacterBehavior, JoinData},
         utils::*,
@@ -69,7 +69,7 @@ impl CharacterBehavior for Data {
                     });
                 } else {
                     // Remove burning effect if active
-                    output_events.emit_server(ServerEvent::Buff {
+                    output_events.emit_server(BuffEvent {
                         entity: data.entity,
                         buff_change: BuffChange::RemoveByKind(BuffKind::Burning),
                     });

common/src/states/self_buff.rs

@@ -4,7 +4,7 @@ use crate::{
         character_state::OutputEvents,
         CharacterState, StateUpdate,
     },
-    event::{LocalEvent, ServerEvent},
+    event::{BuffEvent, ComboChangeEvent, LocalEvent},
     outcome::Outcome,
     resources::Secs,
     states::{
@@ -79,7 +79,7 @@ impl CharacterBehavior for Data {
                     } else {
                         self.static_data.combo_cost
                     };
-                    output_events.emit_server(ServerEvent::ComboChange {
+                    output_events.emit_server(ComboChangeEvent {
                         entity: data.entity,
                         change: -(combo_consumption as i32),
                     });
@@ -106,7 +106,7 @@ impl CharacterBehavior for Data {
                     if self.static_data.enforced_limit {
                         buff_cat_ids.push(BuffCategory::SelfBuff);
 
-                        output_events.emit_server(ServerEvent::Buff {
+                        output_events.emit_server(BuffEvent {
                             entity: data.entity,
                             buff_change: BuffChange::RemoveByCategory {
                                 all_required: vec![BuffCategory::SelfBuff],
@@ -128,7 +128,7 @@ impl CharacterBehavior for Data {
                         *data.time,
                         Some(data.stats),
                     );
-                    output_events.emit_server(ServerEvent::Buff {
+                    output_events.emit_server(BuffEvent {
                         entity: data.entity,
                         buff_change: BuffChange::Add(buff),
                     });

common/src/states/shockwave.rs

@@ -8,7 +8,7 @@ use crate::{
         shockwave::{self, ShockwaveDodgeable},
         CharacterState, StateUpdate,
     },
-    event::{LocalEvent, ServerEvent},
+    event::{LocalEvent, ShockwaveEvent},
     outcome::Outcome,
     states::{
         behavior::{CharacterBehavior, JoinData},
@@ -124,7 +124,7 @@ impl CharacterBehavior for Data {
                         owner: Some(*data.uid),
                         specifier: self.static_data.specifier,
                     };
-                    output_events.emit_server(ServerEvent::Shockwave {
+                    output_events.emit_server(ShockwaveEvent {
                         properties,
                         pos: *data.pos,
                         ori: *data.ori,

common/src/states/sprite_interact.rs

@@ -4,7 +4,7 @@ use crate::{
         character_state::OutputEvents, controller::InputKind, item::ItemDefinitionIdOwned,
         slot::InvSlotId, CharacterState, InventoryManip, StateUpdate,
     },
-    event::{LocalEvent, ServerEvent},
+    event::{InventoryManipEvent, LocalEvent, ToggleSpriteLightEvent},
     outcome::Outcome,
     states::behavior::{CharacterBehavior, JoinData},
     terrain::SpriteKind,
@@ -117,17 +117,16 @@ impl CharacterBehavior for Data {
                             sprite_pos: self.static_data.sprite_pos,
                             required_item: inv_slot,
                         };
-
                         match self.static_data.sprite_kind {
                             SpriteInteractKind::ToggleLight(enable) => {
-                                output_events.emit_server(ServerEvent::ToggleSpriteLight {
+                                output_events.emit_server(ToggleSpriteLightEvent {
                                     entity: data.entity,
                                     pos: self.static_data.sprite_pos,
                                     enable,
                                 })
                             },
                             _ => output_events
-                                .emit_server(ServerEvent::InventoryManip(data.entity, inv_manip)),
+                                .emit_server(InventoryManipEvent(data.entity, inv_manip)),
                         }
 
                         if matches!(self.static_data.sprite_kind, SpriteInteractKind::Unlock) {

common/src/states/sprite_summon.rs

@@ -1,6 +1,6 @@
 use crate::{
     comp::{character_state::OutputEvents, CharacterState, StateUpdate},
-    event::{LocalEvent, ServerEvent},
+    event::{CreateSpriteEvent, LocalEvent},
     outcome::Outcome,
     spiral::Spiral2d,
     states::{
@@ -173,7 +173,7 @@ impl CharacterBehavior for Data {
                                 };
                                 for i in 0..layers {
                                     // Send server event to create sprite
-                                    output_events.emit_server(ServerEvent::CreateSprite {
+                                    output_events.emit_server(CreateSpriteEvent {
                                         pos: Vec3::new(sprite_pos.x, sprite_pos.y, z + i),
                                         sprite: self.static_data.sprite,
                                         del_timeout: self.static_data.del_timeout,

common/src/states/use_item.rs

@@ -10,7 +10,7 @@ use crate::{
         },
         CharacterState, InventoryManip, StateUpdate,
     },
-    event::ServerEvent,
+    event::{BuffEvent, InventoryManipEvent},
     states::behavior::{CharacterBehavior, JoinData},
 };
 use serde::{Deserialize, Serialize};
@@ -141,11 +141,11 @@ impl CharacterBehavior for Data {
 
         if matches!(update.character, CharacterState::Roll(_)) {
             // Remove potion/saturation effect if left the use item state early by rolling
-            output_events.emit_server(ServerEvent::Buff {
+            output_events.emit_server(BuffEvent {
                 entity: data.entity,
                 buff_change: BuffChange::RemoveByKind(BuffKind::Potion),
             });
-            output_events.emit_server(ServerEvent::Buff {
+            output_events.emit_server(BuffEvent {
                 entity: data.entity,
                 buff_change: BuffChange::RemoveByKind(BuffKind::Saturation),
             });
@@ -217,6 +217,6 @@ fn use_item(data: &JoinData, output_events: &mut OutputEvents, state: &Data) {
     if item_is_same {
         // Create inventory manipulation event
         let inv_manip = InventoryManip::Use(Slot::Inventory(state.static_data.inv_slot));
-        output_events.emit_server(ServerEvent::InventoryManip(data.entity, inv_manip));
+        output_events.emit_server(InventoryManipEvent(data.entity, inv_manip));
     }
 }

common/src/states/utils.rs

@@ -19,7 +19,7 @@ use crate::{
         StateUpdate,
     },
     consts::{FRIC_GROUND, GRAVITY, MAX_PICKUP_RANGE},
-    event::{LocalEvent, ServerEvent},
+    event::{BuffEvent, ChangeStanceEvent, ComboChangeEvent, InventoryManipEvent, LocalEvent},
     mounting::Volume,
     outcome::Outcome,
     states::{behavior::JoinData, utils::CharacterState::Idle, *},
@@ -1058,7 +1058,7 @@ pub fn handle_manipulate_loadout(
             } else {
                 // Else emit inventory action instantaneously
                 let inv_manip = InventoryManip::Use(slot);
-                output_events.emit_server(ServerEvent::InventoryManip(data.entity, inv_manip));
+                output_events.emit_server(InventoryManipEvent(data.entity, inv_manip));
             }
         },
         InventoryAction::Collect(sprite_pos) => {
@@ -1137,21 +1137,18 @@ pub fn handle_manipulate_loadout(
         // For inventory actions without a dedicated character state, just do action instantaneously
         InventoryAction::Swap(equip, slot) => {
             let inv_manip = InventoryManip::Swap(Slot::Equip(equip), slot);
-            output_events.emit_server(ServerEvent::InventoryManip(data.entity, inv_manip));
+            output_events.emit_server(InventoryManipEvent(data.entity, inv_manip));
         },
         InventoryAction::Drop(equip) => {
             let inv_manip = InventoryManip::Drop(Slot::Equip(equip));
-            output_events.emit_server(ServerEvent::InventoryManip(data.entity, inv_manip));
+            output_events.emit_server(InventoryManipEvent(data.entity, inv_manip));
         },
         InventoryAction::Sort => {
-            output_events.emit_server(ServerEvent::InventoryManip(
-                data.entity,
-                InventoryManip::Sort,
-            ));
+            output_events.emit_server(InventoryManipEvent(data.entity, InventoryManip::Sort));
         },
         InventoryAction::Use(slot @ Slot::Equip(_)) => {
             let inv_manip = InventoryManip::Use(slot);
-            output_events.emit_server(ServerEvent::InventoryManip(data.entity, inv_manip));
+            output_events.emit_server(InventoryManipEvent(data.entity, inv_manip));
         },
         InventoryAction::Use(Slot::Overflow(_)) => {
             // Items in overflow slots cannot be used until moved to a real slot
@@ -1279,7 +1276,7 @@ fn handle_ability(
             if let Some(init_event) = ability.ability_meta().init_event {
                 match init_event {
                     AbilityInitEvent::EnterStance(stance) => {
-                        output_events.emit_server(ServerEvent::ChangeStance {
+                        output_events.emit_server(ChangeStanceEvent {
                             entity: data.entity,
                             stance,
                         });
@@ -1614,7 +1611,7 @@ impl HandInfo {
 
 pub fn leave_stance(data: &JoinData<'_>, output_events: &mut OutputEvents) {
     if !matches!(data.stance, Some(Stance::None)) {
-        output_events.emit_server(ServerEvent::ChangeStance {
+        output_events.emit_server(ChangeStanceEvent {
             entity: data.entity,
             stance: Stance::None,
         });
@@ -1653,7 +1650,7 @@ impl ComboConsumption {
             Self::All => combo,
             Self::Half => (combo + 1) / 2,
         };
-        output_events.emit_server(ServerEvent::ComboChange {
+        output_events.emit_server(ComboChangeEvent {
             entity: data.entity,
             change: -(to_consume as i32),
         });
@@ -1663,13 +1660,13 @@ impl ComboConsumption {
 fn loadout_change_hook(data: &JoinData<'_>, output_events: &mut OutputEvents, clear_combo: bool) {
     if clear_combo {
         // Reset combo to 0
-        output_events.emit_server(ServerEvent::ComboChange {
+        output_events.emit_server(ComboChangeEvent {
             entity: data.entity,
             change: -data.combo.map_or(0, |c| c.counter() as i32),
         });
     }
     // Clear any buffs from equipped weapons
-    output_events.emit_server(ServerEvent::Buff {
+    output_events.emit_server(BuffEvent {
         entity: data.entity,
         buff_change: BuffChange::RemoveByCategory {
             all_required: vec![BuffCategory::RemoveOnLoadoutChange],

common/state/src/lib.rs

@@ -8,4 +8,4 @@ mod special_areas;
 mod state;
 // TODO: breakup state module and remove glob
 pub use special_areas::*;
-pub use state::{BlockChange, BlockDiff, State, TerrainChanges};
+pub use state::{BlockChange, BlockDiff, ScheduledBlockChange, State, TerrainChanges};

common/state/src/state.rs

@@ -8,7 +8,7 @@ use common::uid::IdMaps;
 use common::{
     calendar::Calendar,
     comp,
-    event::{EventBus, LocalEvent, ServerEvent},
+    event::{register_event_busses, EventBus, LocalEvent},
     link::Is,
     mounting::{Mount, Rider, VolumeRider, VolumeRiders},
     outcome::Outcome,
@@ -331,7 +331,7 @@ impl State {
         ecs.insert(SlowJobPool::new(slow_limit, 10_000, thread_pool));
 
         // TODO: only register on the server
-        ecs.insert(EventBus::<ServerEvent>::default());
+        register_event_busses(&mut ecs);
         ecs.insert(comp::group::GroupManager::default());
         ecs.insert(SysMetrics::default());
         ecs.insert(PhysicsMetrics::default());
@@ -417,6 +417,15 @@ impl State {
         self.ecs.read_storage().get(entity).copied()
     }
 
+    /// # Panics
+    /// Panics if `EventBus<E>` is borrowed
+    pub fn emit_event_now<E>(&self, event: E)
+    where
+        EventBus<E>: Resource,
+    {
+        self.ecs.write_resource::<EventBus<E>>().emit_now(event)
+    }
+
     /// Given mutable access to the resource R, assuming the resource
     /// component exists (this is already the behavior of functions like `fetch`
     /// and `write_component_ignore_entity_dead`).  Since all of our resources
@@ -685,9 +694,7 @@ impl State {
         self.dispatcher.dispatch(&self.ecs);
         drop(guard);
 
-        section_span!(guard, "maintain ecs");
-        self.ecs.maintain();
-        drop(guard);
+        self.maintain_ecs();
 
         if update_terrain {
             self.apply_terrain_changes_internal(true, block_update);
@@ -730,6 +737,11 @@ impl State {
         drop(guard);
     }
 
+    pub fn maintain_ecs(&mut self) {
+        span!(_guard, "maintain ecs");
+        self.ecs.maintain();
+    }
+
     /// Clean up the state after a tick.
     pub fn cleanup(&mut self) {
         span!(_guard, "cleanup", "State::cleanup");

common/systems/src/aura.rs

@@ -6,19 +6,27 @@ use common::{
         group::Group,
         Alignment, Aura, Auras, BuffKind, Buffs, CharacterState, Health, Player, Pos, Stats,
     },
-    event::{Emitter, EventBus, ServerEvent},
+    event::{AuraEvent, BuffEvent, EmitExt},
+    event_emitters,
     resources::Time,
     uid::{IdMaps, Uid},
 };
 use common_ecs::{Job, Origin, Phase, System};
 use specs::{shred, Entities, Entity as EcsEntity, Join, Read, ReadStorage, SystemData};
 
+event_emitters! {
+    struct Events[Emitters] {
+        aura: AuraEvent,
+        buff: BuffEvent,
+    }
+}
+
 #[derive(SystemData)]
 pub struct ReadData<'a> {
     entities: Entities<'a>,
     players: ReadStorage<'a, Player>,
     time: Read<'a, Time>,
-    server_bus: Read<'a, EventBus<ServerEvent>>,
+    events: Events<'a>,
     id_maps: Read<'a, IdMaps>,
     cached_spatial_grid: Read<'a, common::CachedSpatialGrid>,
     positions: ReadStorage<'a, Pos>,
@@ -42,7 +50,7 @@ impl<'a> System<'a> for Sys {
     const PHASE: Phase = Phase::Create;
 
     fn run(_job: &mut Job<Self>, read_data: Self::SystemData) {
-        let mut server_emitter = read_data.server_bus.emitter();
+        let mut emitters = read_data.events.get_emitters();
 
         // Iterate through all entities with an aura
         for (entity, pos, auras_comp, uid) in (
@@ -118,14 +126,14 @@ impl<'a> System<'a> for Sys {
                                 target_buffs,
                                 stats,
                                 &read_data,
-                                &mut server_emitter,
+                                &mut emitters,
                             );
                         }
                     }
                 });
             }
             if !expired_auras.is_empty() {
-                server_emitter.emit(ServerEvent::Aura {
+                emitters.emit(AuraEvent {
                     entity,
                     aura_change: AuraChange::RemoveByKey(expired_auras),
                 });
@@ -145,7 +153,7 @@ fn activate_aura(
     target_buffs: &Buffs,
     stats: Option<&Stats>,
     read_data: &ReadData,
-    server_emitter: &mut Emitter<ServerEvent>,
+    emitters: &mut impl EmitExt<BuffEvent>,
 ) {
     let should_activate = match aura.aura_kind {
         AuraKind::Buff { kind, source, .. } => {
@@ -223,7 +231,7 @@ fn activate_aura(
                     && buff.data.strength >= data.strength
             });
             if emit_buff {
-                server_emitter.emit(ServerEvent::Buff {
+                emitters.emit(BuffEvent {
                     entity: target,
                     buff_change: BuffChange::Add(Buff::new(
                         kind,

common/systems/src/beam.rs

@@ -5,7 +5,8 @@ use common::{
         Alignment, Beam, Body, Buffs, CharacterState, Combo, Energy, Group, Health, Inventory, Ori,
         Player, Pos, Scale, Stats,
     },
-    event::{EventBus, ServerEvent},
+    event::{self, EmitExt, EventBus},
+    event_emitters,
     outcome::Outcome,
     resources::{DeltaTime, Time},
     terrain::TerrainGrid,
@@ -21,11 +22,24 @@ use specs::{
 };
 use vek::*;
 
+event_emitters! {
+    struct ReadAttackEvents[AttackEmitters] {
+        health_change: event::HealthChangeEvent,
+        energy_change: event::EnergyChangeEvent,
+        poise_change: event::PoiseChangeEvent,
+        sound: event::SoundEvent,
+        parry_hook: event::ParryHookEvent,
+        kockback: event::KnockbackEvent,
+        entity_attack_hoow: event::EntityAttackedHookEvent,
+        combo_change: event::ComboChangeEvent,
+        buff: event::BuffEvent,
+    }
+}
+
 #[derive(SystemData)]
 pub struct ReadData<'a> {
     entities: Entities<'a>,
     players: ReadStorage<'a, Player>,
-    server_bus: Read<'a, EventBus<ServerEvent>>,
     time: Read<'a, Time>,
     dt: Read<'a, DeltaTime>,
     terrain: ReadExpect<'a, TerrainGrid>,
@@ -46,6 +60,7 @@ pub struct ReadData<'a> {
     character_states: ReadStorage<'a, CharacterState>,
     buffs: ReadStorage<'a, Buffs>,
     outcomes: Read<'a, EventBus<Outcome>>,
+    events: ReadAttackEvents<'a>,
 }
 
 /// This system is responsible for handling beams that heal or do damage
@@ -59,7 +74,6 @@ impl<'a> System<'a> for Sys {
     const PHASE: Phase = Phase::Create;
 
     fn run(job: &mut Job<Self>, (read_data, mut beams): Self::SystemData) {
-        let mut server_emitter = read_data.server_bus.emitter();
         let mut outcomes_emitter = read_data.outcomes.emitter();
 
         (
@@ -100,7 +114,8 @@ impl<'a> System<'a> for Sys {
         job.cpu_stats.measure(ParMode::Rayon);
 
         // Beams
-        let (server_events, add_hit_entities, new_outcomes) = (
+        // Emitters will append their events when dropped.
+        let (_emitters, add_hit_entities, new_outcomes) = (
             &read_data.entities,
             &read_data.positions,
             &read_data.orientations,
@@ -109,14 +124,14 @@ impl<'a> System<'a> for Sys {
         )
             .par_join()
             .fold(
-                || (Vec::new(), Vec::new(), Vec::new()),
-                |(mut server_events, mut add_hit_entities, mut outcomes),
+                || (read_data.events.get_emitters(), Vec::new(), Vec::new()),
+                |(mut emitters, mut add_hit_entities, mut outcomes),
                  (entity, pos, ori, uid, beam)| {
                     // Note: rayon makes it difficult to hold onto a thread-local RNG, if grabbing
                     // this becomes a bottleneck we can look into alternatives.
                     let mut rng = rand::thread_rng();
                     if rng.gen_bool(0.005) {
-                        server_events.push(ServerEvent::Sound {
+                        emitters.emit(event::SoundEvent {
                             sound: Sound::new(SoundKind::Beam, pos.0, 13.0, read_data.time.0),
                         });
                     }
@@ -273,7 +288,7 @@ impl<'a> System<'a> for Sys {
                                 1.0,
                                 AttackSource::Beam,
                                 *read_data.time,
-                                |e| server_events.push(e),
+                                &mut emitters,
                                 |o| outcomes.push(o),
                                 &mut rng,
                                 0,
@@ -282,14 +297,14 @@ impl<'a> System<'a> for Sys {
                             add_hit_entities.push((entity, target));
                         }
                     });
-                    (server_events, add_hit_entities, outcomes)
+                    (emitters, add_hit_entities, outcomes)
                 },
             )
             .reduce(
-                || (Vec::new(), Vec::new(), Vec::new()),
+                || (read_data.events.get_emitters(), Vec::new(), Vec::new()),
                 |(mut events_a, mut hit_entities_a, mut outcomes_a),
-                 (mut events_b, mut hit_entities_b, mut outcomes_b)| {
-                    events_a.append(&mut events_b);
+                 (events_b, mut hit_entities_b, mut outcomes_b)| {
+                    events_a.append(events_b);
                     hit_entities_a.append(&mut hit_entities_b);
                     outcomes_a.append(&mut outcomes_b);
                     (events_a, hit_entities_a, outcomes_a)
@@ -298,7 +313,6 @@ impl<'a> System<'a> for Sys {
         job.cpu_stats.measure(ParMode::Single);
 
         outcomes_emitter.emit_many(new_outcomes);
-        server_emitter.emit_many(server_events);
 
         for (entity, hit_entity) in add_hit_entities {
             if let Some(ref mut beam) = beams.get_mut(entity) {

common/systems/src/buff.rs

@@ -13,7 +13,11 @@ use common::{
         Energy, Group, Health, HealthChange, Inventory, LightEmitter, ModifierKind, PhysicsState,
         Pos, Stats,
     },
-    event::{Emitter, EventBus, ServerEvent},
+    event::{
+        BuffEvent, ChangeBodyEvent, CreateSpriteEvent, EmitExt, EnergyChangeEvent,
+        HealthChangeEvent, RemoveLightEmitterEvent, SoundEvent,
+    },
+    event_emitters,
     outcome::Outcome,
     resources::{DeltaTime, Secs, Time},
     terrain::SpriteKind,
@@ -29,12 +33,24 @@ use specs::{
 };
 use vek::Vec3;
 
+event_emitters! {
+    struct Events[EventEmitters] {
+        buff: BuffEvent,
+        change_body: ChangeBodyEvent,
+        remove_light: RemoveLightEmitterEvent,
+        health_change: HealthChangeEvent,
+        energy_change: EnergyChangeEvent,
+        sound: SoundEvent,
+        create_sprite: CreateSpriteEvent,
+        outcome: Outcome,
+    }
+}
+
 #[derive(SystemData)]
 pub struct ReadData<'a> {
     entities: Entities<'a>,
     dt: Read<'a, DeltaTime>,
-    server_bus: Read<'a, EventBus<ServerEvent>>,
-    outcome_bus: Read<'a, EventBus<Outcome>>,
+    events: Events<'a>,
     inventories: ReadStorage<'a, Inventory>,
     healths: ReadStorage<'a, Health>,
     energies: ReadStorage<'a, Energy>,
@@ -60,8 +76,7 @@ impl<'a> System<'a> for Sys {
     const PHASE: Phase = Phase::Create;
 
     fn run(job: &mut Job<Self>, (read_data, mut stats): Self::SystemData) {
-        let mut server_emitter = read_data.server_bus.emitter();
-        let mut outcome = read_data.outcome_bus.emitter();
+        let mut emitters = read_data.events.get_emitters();
         let dt = read_data.dt.0;
         // Set to false to avoid spamming server
         stats.set_event_emission(false);
@@ -116,11 +131,11 @@ impl<'a> System<'a> for Sys {
             // slower than parallel checking above
             for e in to_put_out_campfires {
                 {
-                    server_emitter.emit(ServerEvent::ChangeBody {
+                    emitters.emit(ChangeBodyEvent {
                         entity: e,
                         new_body: Body::Object(object::Body::Campfire),
                     });
-                    server_emitter.emit(ServerEvent::RemoveLightEmitter { entity: e });
+                    emitters.emit(RemoveLightEmitterEvent { entity: e });
                 }
             }
         }
@@ -144,7 +159,7 @@ impl<'a> System<'a> for Sys {
                     Some(SpriteKind::EnsnaringVines) | Some(SpriteKind::EnsnaringWeb)
                 ) {
                     // If on ensnaring vines, apply ensnared debuff
-                    server_emitter.emit(ServerEvent::Buff {
+                    emitters.emit(BuffEvent {
                         entity,
                         buff_change: BuffChange::Add(Buff::new(
                             BuffKind::Ensnared,
@@ -161,7 +176,7 @@ impl<'a> System<'a> for Sys {
                     Some(SpriteKind::SeaUrchin)
                 ) {
                     // If touching Sea Urchin apply Bleeding buff
-                    server_emitter.emit(ServerEvent::Buff {
+                    emitters.emit(BuffEvent {
                         entity,
                         buff_change: BuffChange::Add(Buff::new(
                             BuffKind::Bleeding,
@@ -181,17 +196,17 @@ impl<'a> System<'a> for Sys {
                     // TODO: Determine a better place to emit sprite change events
                     if let Some(pos) = read_data.positions.get(entity) {
                         // If touching Trap - change sprite and apply Bleeding buff
-                        server_emitter.emit(ServerEvent::CreateSprite {
+                        emitters.emit(CreateSpriteEvent {
                             pos: Vec3::new(pos.0.x as i32, pos.0.y as i32, pos.0.z as i32 - 1),
                             sprite: SpriteKind::HaniwaTrapTriggered,
                             del_timeout: Some((4.0, 1.0)),
                         });
-                        server_emitter.emit(ServerEvent::Sound {
+                        emitters.emit(SoundEvent {
                             sound: Sound::new(SoundKind::Trap, pos.0, 12.0, read_data.time.0),
                         });
-                        outcome.emit(Outcome::Slash { pos: pos.0 });
+                        emitters.emit(Outcome::Slash { pos: pos.0 });
 
-                        server_emitter.emit(ServerEvent::Buff {
+                        emitters.emit(BuffEvent {
                             entity,
                             buff_change: BuffChange::Add(Buff::new(
                                 BuffKind::Bleeding,
@@ -209,7 +224,7 @@ impl<'a> System<'a> for Sys {
                     Some(SpriteKind::IronSpike | SpriteKind::HaniwaTrapTriggered)
                 ) {
                     // If touching Iron Spike apply Bleeding buff
-                    server_emitter.emit(ServerEvent::Buff {
+                    emitters.emit(BuffEvent {
                         entity,
                         buff_change: BuffChange::Add(Buff::new(
                             BuffKind::Bleeding,
@@ -226,7 +241,7 @@ impl<'a> System<'a> for Sys {
                     Some(SpriteKind::HotSurface)
                 ) {
                     // If touching a hot surface apply Burning buff
-                    server_emitter.emit(ServerEvent::Buff {
+                    emitters.emit(BuffEvent {
                         entity,
                         buff_change: BuffChange::Add(Buff::new(
                             BuffKind::Burning,
@@ -243,7 +258,7 @@ impl<'a> System<'a> for Sys {
                     Some(SpriteKind::IceSpike)
                 ) {
                     // When standing on IceSpike, apply bleeding
-                    server_emitter.emit(ServerEvent::Buff {
+                    emitters.emit(BuffEvent {
                         entity,
                         buff_change: BuffChange::Add(Buff::new(
                             BuffKind::Bleeding,
@@ -255,7 +270,7 @@ impl<'a> System<'a> for Sys {
                         )),
                     });
                     // When standing on IceSpike also apply Frozen
-                    server_emitter.emit(ServerEvent::Buff {
+                    emitters.emit(BuffEvent {
                         entity,
                         buff_change: BuffChange::Add(Buff::new(
                             BuffKind::Frozen,
@@ -272,7 +287,7 @@ impl<'a> System<'a> for Sys {
                     Some(SpriteKind::FireBlock)
                 ) {
                     // If on FireBlock vines, apply burning buff
-                    server_emitter.emit(ServerEvent::Buff {
+                    emitters.emit(BuffEvent {
                         entity,
                         buff_change: BuffChange::Add(Buff::new(
                             BuffKind::Burning,
@@ -293,7 +308,7 @@ impl<'a> System<'a> for Sys {
                     })
                 ) {
                     // If in lava fluid, apply burning debuff
-                    server_emitter.emit(ServerEvent::Buff {
+                    emitters.emit(BuffEvent {
                         entity,
                         buff_change: BuffChange::Add(Buff::new(
                             BuffKind::Burning,
@@ -313,7 +328,7 @@ impl<'a> System<'a> for Sys {
                 ) && buff_comp.kinds[BuffKind::Burning].is_some()
                 {
                     // If in water fluid and currently burning, remove burning debuffs
-                    server_emitter.emit(ServerEvent::Buff {
+                    emitters.emit(BuffEvent {
                         entity,
                         buff_change: BuffChange::RemoveByKind(BuffKind::Burning),
                     });
@@ -363,7 +378,7 @@ impl<'a> System<'a> for Sys {
                     };
                     if replace {
                         expired_buffs.push(buff_key);
-                        server_emitter.emit(ServerEvent::Buff {
+                        emitters.emit(BuffEvent {
                             entity,
                             buff_change: BuffChange::Add(Buff::new(
                                 buff.kind,
@@ -458,7 +473,7 @@ impl<'a> System<'a> for Sys {
                                 energy,
                                 entity,
                                 buff_owner,
-                                &mut server_emitter,
+                                &mut emitters,
                                 dt,
                                 *read_data.time,
                                 expired_buffs.contains(&buff_key),
@@ -472,12 +487,12 @@ impl<'a> System<'a> for Sys {
             // Update body if needed.
             let new_body = body_override.unwrap_or(stat.original_body);
             if new_body != *body {
-                server_emitter.emit(ServerEvent::ChangeBody { entity, new_body });
+                emitters.emit(ChangeBodyEvent { entity, new_body });
             }
 
             // Remove buffs that expire
             if !expired_buffs.is_empty() {
-                server_emitter.emit(ServerEvent::Buff {
+                emitters.emit(BuffEvent {
                     entity,
                     buff_change: BuffChange::RemoveByKey(expired_buffs),
                 });
@@ -485,7 +500,7 @@ impl<'a> System<'a> for Sys {
 
             // Remove buffs that don't persist on death
             if health.is_dead {
-                server_emitter.emit(ServerEvent::Buff {
+                emitters.emit(BuffEvent {
                     entity,
                     buff_change: BuffChange::RemoveByCategory {
                         all_required: vec![],
@@ -515,7 +530,9 @@ fn execute_effect(
     energy: &Energy,
     entity: Entity,
     buff_owner: Option<Uid>,
-    server_emitter: &mut Emitter<ServerEvent>,
+    server_emitter: &mut (
+             impl EmitExt<HealthChangeEvent> + EmitExt<EnergyChangeEvent> + EmitExt<BuffEvent>
+         ),
     dt: f32,
     time: Time,
     buff_will_expire: bool,
@@ -577,7 +594,7 @@ fn execute_effect(
                         DamageContributor::new(uid, read_data.groups.get(entity).cloned())
                     })
                 });
-                server_emitter.emit(ServerEvent::HealthChange {
+                server_emitter.emit(HealthChangeEvent {
                     entity,
                     change: HealthChange {
                         amount,
@@ -602,7 +619,7 @@ fn execute_effect(
                     ModifierKind::Additive => amount,
                     ModifierKind::Multiplicative => energy.maximum() * amount,
                 };
-                server_emitter.emit(ServerEvent::EnergyChange {
+                server_emitter.emit(EnergyChangeEvent {
                     entity,
                     change: amount,
                 });
@@ -718,7 +735,7 @@ fn execute_effect(
         },
         BuffEffect::BuffImmunity(buff_kind) => {
             if buffs_comp.contains(*buff_kind) {
-                server_emitter.emit(ServerEvent::Buff {
+                server_emitter.emit(BuffEvent {
                     entity,
                     buff_change: BuffChange::RemoveByKind(*buff_kind),
                 });

common/systems/src/character_behavior.rs

@@ -5,13 +5,13 @@ use specs::{
 use common::{
     comp::{
         self,
-        character_state::OutputEvents,
+        character_state::{CharacterStateEvents, OutputEvents},
         inventory::item::{tool::AbilityMap, MaterialStatManifest},
         ActiveAbilities, Beam, Body, CharacterActivity, CharacterState, Combo, Controller, Density,
         Energy, Health, Inventory, InventoryManip, Mass, Melee, Ori, PhysicsState, Poise, Pos,
         Scale, SkillSet, Stance, StateUpdate, Stats, Vel,
     },
-    event::{EventBus, LocalEvent, ServerEvent},
+    event::{self, EventBus, KnockbackEvent, LocalEvent},
     link::Is,
     mounting::{Rider, VolumeRider},
     outcome::Outcome,
@@ -28,7 +28,7 @@ use common_ecs::{Job, Origin, Phase, System};
 #[derive(SystemData)]
 pub struct ReadData<'a> {
     entities: Entities<'a>,
-    server_bus: Read<'a, EventBus<ServerEvent>>,
+    events: CharacterStateEvents<'a>,
     local_bus: Read<'a, EventBus<LocalEvent>>,
     dt: Read<'a, DeltaTime>,
     time: Read<'a, Time>,
@@ -96,13 +96,12 @@ impl<'a> System<'a> for Sys {
             outcomes,
         ): Self::SystemData,
     ) {
-        let mut server_emitter = read_data.server_bus.emitter();
         let mut local_emitter = read_data.local_bus.emitter();
         let mut outcomes_emitter = outcomes.emitter();
+        let mut emitters = read_data.events.get_emitters();
 
         let mut local_events = Vec::new();
-        let mut server_events = Vec::new();
-        let mut output_events = OutputEvents::new(&mut local_events, &mut server_events);
+        let mut output_events = OutputEvents::new(&mut local_events, &mut emitters);
 
         let join = (
             &read_data.entities,
@@ -179,7 +178,7 @@ impl<'a> System<'a> for Sys {
                         state: poise_state,
                     });
                     if let Some(impulse_strength) = impulse_strength {
-                        server_emitter.emit(ServerEvent::Knockback {
+                        output_events.emit_server(KnockbackEvent {
                             entity,
                             impulse: impulse_strength * *poise.knockback(),
                         });
@@ -255,7 +254,6 @@ impl<'a> System<'a> for Sys {
         });
 
         local_emitter.append_vec(local_events);
-        server_emitter.append_vec(server_events);
     }
 }
 
@@ -297,7 +295,7 @@ impl Sys {
             join.controller.queued_inputs.remove(&input);
         }
         if state_update.swap_equipped_weapons {
-            output_events.emit_server(ServerEvent::InventoryManip(
+            output_events.emit_server(event::InventoryManipEvent(
                 join.entity,
                 InventoryManip::SwapEquippedWeapons,
             ));

common/systems/src/controller.rs

@@ -4,7 +4,8 @@ use common::{
         agent::{Sound, SoundKind},
         Body, BuffChange, Collider, ControlEvent, Controller, Pos, Scale,
     },
-    event::{EventBus, ServerEvent},
+    event::{self, EmitExt},
+    event_emitters,
     terrain::TerrainGrid,
     uid::IdMaps,
 };
@@ -12,11 +13,33 @@ use common_ecs::{Job, Origin, Phase, System};
 use specs::{shred, Entities, Join, Read, ReadExpect, ReadStorage, SystemData, WriteStorage};
 use vek::*;
 
+event_emitters! {
+    struct Events[EventEmitters] {
+        mount: event::MountEvent,
+        mount_volume: event::MountVolumeEvent,
+        set_pet_stay: event::SetPetStayEvent,
+        unmount: event::UnmountEvent,
+        lantern: event::SetLanternEvent,
+        npc_interact: event::NpcInteractEvent,
+        initiate_invite: event::InitiateInviteEvent,
+        invite_response: event::InviteResponseEvent,
+        process_trade_action: event::ProcessTradeActionEvent,
+        inventory_manip: event::InventoryManipEvent,
+        group_manip: event::GroupManipEvent,
+        respawn: event::RespawnEvent,
+        sound: event::SoundEvent,
+        change_ability: event::ChangeAbilityEvent,
+        change_stance: event::ChangeStanceEvent,
+        start_teleporting: event::StartTeleportingEvent,
+        buff: event::BuffEvent,
+    }
+}
+
 #[derive(SystemData)]
 pub struct ReadData<'a> {
     entities: Entities<'a>,
     id_maps: Read<'a, IdMaps>,
-    server_bus: Read<'a, EventBus<ServerEvent>>,
+    events: Events<'a>,
     terrain_grid: ReadExpect<'a, TerrainGrid>,
     positions: ReadStorage<'a, Pos>,
     bodies: ReadStorage<'a, Body>,
@@ -35,7 +58,7 @@ impl<'a> System<'a> for Sys {
     const PHASE: Phase = Phase::Create;
 
     fn run(_job: &mut Job<Self>, (read_data, mut controllers): Self::SystemData) {
-        let mut server_emitter = read_data.server_bus.emitter();
+        let mut emitters = read_data.events.get_emitters();
 
         for (entity, controller) in (&read_data.entities, &mut controllers).join() {
             // Sanitize inputs to avoid clients sending bad data
@@ -46,7 +69,7 @@ impl<'a> System<'a> for Sys {
                 match event {
                     ControlEvent::Mount(mountee_uid) => {
                         if let Some(mountee_entity) = read_data.id_maps.uid_entity(mountee_uid) {
-                            server_emitter.emit(ServerEvent::Mount(entity, mountee_entity));
+                            emitters.emit(event::MountEvent(entity, mountee_entity));
                         }
                     },
                     ControlEvent::MountVolume(volume) => {
@@ -56,51 +79,49 @@ impl<'a> System<'a> for Sys {
                             &read_data.colliders,
                         ) {
                             if block.is_mountable() {
-                                server_emitter.emit(ServerEvent::MountVolume(entity, volume));
+                                emitters.emit(event::MountVolumeEvent(entity, volume));
                             }
                         }
                     },
                     ControlEvent::SetPetStay(pet_uid, stay) => {
                         if let Some(pet_entity) = read_data.id_maps.uid_entity(pet_uid) {
-                            server_emitter.emit(ServerEvent::SetPetStay(entity, pet_entity, stay));
+                            emitters.emit(event::SetPetStayEvent(entity, pet_entity, stay));
                         }
                     },
                     ControlEvent::RemoveBuff(buff_id) => {
-                        server_emitter.emit(ServerEvent::Buff {
+                        emitters.emit(event::BuffEvent {
                             entity,
                             buff_change: BuffChange::RemoveFromController(buff_id),
                         });
                     },
-                    ControlEvent::Unmount => server_emitter.emit(ServerEvent::Unmount(entity)),
+                    ControlEvent::Unmount => emitters.emit(event::UnmountEvent(entity)),
                     ControlEvent::EnableLantern => {
-                        server_emitter.emit(ServerEvent::EnableLantern(entity))
+                        emitters.emit(event::SetLanternEvent(entity, true))
                     },
                     ControlEvent::DisableLantern => {
-                        server_emitter.emit(ServerEvent::DisableLantern(entity))
+                        emitters.emit(event::SetLanternEvent(entity, false))
                     },
                     ControlEvent::Interact(npc_uid, subject) => {
                         if let Some(npc_entity) = read_data.id_maps.uid_entity(npc_uid) {
-                            server_emitter
-                                .emit(ServerEvent::NpcInteract(entity, npc_entity, subject));
+                            emitters.emit(event::NpcInteractEvent(entity, npc_entity, subject));
                         }
                     },
                     ControlEvent::InitiateInvite(inviter_uid, kind) => {
-                        server_emitter.emit(ServerEvent::InitiateInvite(entity, inviter_uid, kind));
+                        emitters.emit(event::InitiateInviteEvent(entity, inviter_uid, kind));
                     },
                     ControlEvent::InviteResponse(response) => {
-                        server_emitter.emit(ServerEvent::InviteResponse(entity, response));
+                        emitters.emit(event::InviteResponseEvent(entity, response));
                     },
                     ControlEvent::PerformTradeAction(trade_id, action) => {
-                        server_emitter
-                            .emit(ServerEvent::ProcessTradeAction(entity, trade_id, action));
+                        emitters.emit(event::ProcessTradeActionEvent(entity, trade_id, action));
                     },
                     ControlEvent::InventoryEvent(event) => {
-                        server_emitter.emit(ServerEvent::InventoryManip(entity, event.into()));
+                        emitters.emit(event::InventoryManipEvent(entity, event.into()));
                     },
                     ControlEvent::GroupManip(manip) => {
-                        server_emitter.emit(ServerEvent::GroupManip(entity, manip))
+                        emitters.emit(event::GroupManipEvent(entity, manip))
                     },
-                    ControlEvent::Respawn => server_emitter.emit(ServerEvent::Respawn(entity)),
+                    ControlEvent::Respawn => emitters.emit(event::RespawnEvent(entity)),
                     ControlEvent::Utterance(kind) => {
                         if let (Some(pos), Some(body), scale) = (
                             read_data.positions.get(entity),
@@ -114,7 +135,7 @@ impl<'a> System<'a> for Sys {
                                 8.0, // TODO: Come up with a better way of determining this
                                 1.0,
                             );
-                            server_emitter.emit(ServerEvent::Sound { sound });
+                            emitters.emit(event::SoundEvent { sound });
                         }
                     },
                     ControlEvent::ChangeAbility {
@@ -122,7 +143,7 @@ impl<'a> System<'a> for Sys {
                         auxiliary_key,
                         new_ability,
                     } => {
-                        server_emitter.emit(ServerEvent::ChangeAbility {
+                        emitters.emit(event::ChangeAbilityEvent {
                             entity,
                             slot,
                             auxiliary_key,
@@ -130,14 +151,14 @@ impl<'a> System<'a> for Sys {
                         });
                     },
                     ControlEvent::LeaveStance => {
-                        server_emitter.emit(ServerEvent::ChangeStance {
+                        emitters.emit(event::ChangeStanceEvent {
                             entity,
                             stance: Stance::None,
                         });
                     },
                     ControlEvent::ActivatePortal(portal_uid) => {
                         if let Some(portal) = read_data.id_maps.uid_entity(portal_uid) {
-                            server_emitter.emit(ServerEvent::StartTeleporting { entity, portal });
+                            emitters.emit(event::StartTeleportingEvent { entity, portal });
                         }
                     },
                 }

common/systems/src/melee.rs

@@ -6,7 +6,8 @@ use common::{
         Alignment, Body, Buffs, CharacterState, Combo, Energy, Group, Health, Inventory, Melee,
         Ori, Player, Pos, Scale, Stats,
     },
-    event::{EventBus, ServerEvent},
+    event::{self, EmitExt, EventBus},
+    event_emitters,
     outcome::Outcome,
     resources::Time,
     terrain::TerrainGrid,
@@ -22,6 +23,21 @@ use specs::{
 };
 use vek::*;
 
+event_emitters! {
+    struct ReadAttackEvents[AttackEmitters] {
+        health_change: event::HealthChangeEvent,
+        energy_change: event::EnergyChangeEvent,
+        poise_change: event::PoiseChangeEvent,
+        sound: event::SoundEvent,
+        mine_block: event::MineBlockEvent,
+        parry_hook: event::ParryHookEvent,
+        kockback: event::KnockbackEvent,
+        entity_attack_hook: event::EntityAttackedHookEvent,
+        combo_change: event::ComboChangeEvent,
+        buff: event::BuffEvent,
+    }
+}
+
 #[derive(SystemData)]
 pub struct ReadData<'a> {
     time: Read<'a, Time>,
@@ -40,10 +56,10 @@ pub struct ReadData<'a> {
     inventories: ReadStorage<'a, Inventory>,
     groups: ReadStorage<'a, Group>,
     char_states: ReadStorage<'a, CharacterState>,
-    server_bus: Read<'a, EventBus<ServerEvent>>,
     stats: ReadStorage<'a, Stats>,
     combos: ReadStorage<'a, Combo>,
     buffs: ReadStorage<'a, Buffs>,
+    events: ReadAttackEvents<'a>,
 }
 
 /// This system is responsible for handling accepted inputs like moving or
@@ -63,7 +79,7 @@ impl<'a> System<'a> for Sys {
     const PHASE: Phase = Phase::Create;
 
     fn run(_job: &mut Job<Self>, (read_data, mut melee_attacks, outcomes): Self::SystemData) {
-        let mut server_emitter = read_data.server_bus.emitter();
+        let mut emitters = read_data.events.get_emitters();
         let mut outcomes_emitter = outcomes.emitter();
         let mut rng = rand::thread_rng();
 
@@ -82,7 +98,7 @@ impl<'a> System<'a> for Sys {
             if melee_attack.applied {
                 continue;
             }
-            server_emitter.emit(ServerEvent::Sound {
+            emitters.emit(event::SoundEvent {
                 sound: Sound::new(SoundKind::Melee, pos.0, 2.0, read_data.time.0),
             });
             melee_attack.applied = true;
@@ -103,7 +119,7 @@ impl<'a> System<'a> for Sys {
                 if eye_pos.distance_squared(block_pos.map(|e| e as f32 + 0.5))
                     < (rad + scale * melee_attack.range).powi(2)
                 {
-                    server_emitter.emit(ServerEvent::MineBlock {
+                    emitters.emit(event::MineBlockEvent {
                         entity: attacker,
                         pos: block_pos,
                         tool,
@@ -270,7 +286,7 @@ impl<'a> System<'a> for Sys {
                             strength,
                             AttackSource::Melee,
                             *read_data.time,
-                            |e| server_emitter.emit(e),
+                            &mut emitters,
                             |o| outcomes_emitter.emit(o),
                             &mut rng,
                             offset as u64,

common/systems/src/phys.rs

@@ -7,7 +7,7 @@ use common::{
         PosVelOriDefer, PreviousPhysCache, Projectile, Scale, Stats, Sticky, Vel,
     },
     consts::{AIR_DENSITY, FRIC_GROUND, GRAVITY},
-    event::{EventBus, ServerEvent},
+    event::{EventBus, LandOnGroundEvent},
     link::Is,
     mounting::{Rider, VolumeRider},
     outcome::Outcome,
@@ -133,7 +133,7 @@ pub struct PhysicsRead<'a> {
     uids: ReadStorage<'a, Uid>,
     terrain: ReadExpect<'a, TerrainGrid>,
     dt: Read<'a, DeltaTime>,
-    event_bus: Read<'a, EventBus<ServerEvent>>,
+    land_on_ground_event: Read<'a, EventBus<LandOnGroundEvent>>,
     game_mode: ReadExpect<'a, GameMode>,
     scales: ReadStorage<'a, Scale>,
     stickies: ReadStorage<'a, Sticky>,
@@ -1364,11 +1364,11 @@ impl<'a> PhysicsData<'a> {
         }
         drop(guard);
 
-        let mut event_emitter = read.event_bus.emitter();
+        let mut event_emitter = read.land_on_ground_event.emitter();
         land_on_grounds
             .into_iter()
             .for_each(|(entity, vel, surface_normal)| {
-                event_emitter.emit(ServerEvent::LandOnGround {
+                event_emitter.emit(LandOnGroundEvent {
                     entity,
                     vel: vel.0,
                     surface_normal,

common/systems/src/projectile.rs

@@ -5,7 +5,12 @@ use common::{
         projectile, Alignment, Body, Buffs, CharacterState, Combo, Energy, Group, Health,
         Inventory, Ori, PhysicsState, Player, Pos, Projectile, Stats, Vel,
     },
-    event::{Emitter, EventBus, ServerEvent},
+    event::{
+        BonkEvent, BuffEvent, ComboChangeEvent, DeleteEvent, EmitExt, Emitter, EnergyChangeEvent,
+        EntityAttackedHookEvent, EventBus, ExplosionEvent, HealthChangeEvent, KnockbackEvent,
+        ParryHookEvent, PoiseChangeEvent, PossessEvent, SoundEvent,
+    },
+    event_emitters,
     outcome::Outcome,
     resources::{DeltaTime, Time},
     uid::{IdMaps, Uid},
@@ -25,6 +30,24 @@ use vek::*;
 
 use common::terrain::TerrainGrid;
 
+event_emitters! {
+    struct Events[Emitters] {
+        sound: SoundEvent,
+        delete: DeleteEvent,
+        explosion: ExplosionEvent,
+        health_change: HealthChangeEvent,
+        energy_change: EnergyChangeEvent,
+        poise_change: PoiseChangeEvent,
+        parry_hook: ParryHookEvent,
+        kockback: KnockbackEvent,
+        entity_attack_hoow: EntityAttackedHookEvent,
+        combo_change: ComboChangeEvent,
+        buff: BuffEvent,
+        bonk: BonkEvent,
+        possess: PossessEvent,
+    }
+}
+
 #[derive(SystemData)]
 pub struct ReadData<'a> {
     time: Read<'a, Time>,
@@ -32,7 +55,7 @@ pub struct ReadData<'a> {
     players: ReadStorage<'a, Player>,
     dt: Read<'a, DeltaTime>,
     id_maps: Read<'a, IdMaps>,
-    server_bus: Read<'a, EventBus<ServerEvent>>,
+    events: Events<'a>,
     uids: ReadStorage<'a, Uid>,
     positions: ReadStorage<'a, Pos>,
     alignments: ReadStorage<'a, Alignment>,
@@ -69,7 +92,7 @@ impl<'a> System<'a> for Sys {
         _job: &mut Job<Self>,
         (read_data, mut orientations, mut projectiles, outcomes): Self::SystemData,
     ) {
-        let mut server_emitter = read_data.server_bus.emitter();
+        let mut emitters = read_data.events.get_emitters();
         let mut outcomes_emitter = outcomes.emitter();
         let mut rng = rand::thread_rng();
 
@@ -88,7 +111,7 @@ impl<'a> System<'a> for Sys {
                 .and_then(|uid| read_data.id_maps.uid_entity(uid));
 
             if physics.on_surface().is_none() && rng.gen_bool(0.05) {
-                server_emitter.emit(ServerEvent::Sound {
+                emitters.emit(SoundEvent {
                     sound: Sound::new(SoundKind::Projectile, pos.0, 4.0, read_data.time.0),
                 });
             }
@@ -174,7 +197,7 @@ impl<'a> System<'a> for Sys {
                         &read_data,
                         &mut projectile_vanished,
                         &mut outcomes_emitter,
-                        &mut server_emitter,
+                        &mut emitters,
                         &mut rng,
                     );
                 }
@@ -200,18 +223,18 @@ impl<'a> System<'a> for Sys {
                                 .get(entity)
                                 .map_or_else(Vec3::zero, |ori| ori.look_vec());
                             let offset = -0.2 * projectile_direction;
-                            server_emitter.emit(ServerEvent::Explosion {
+                            emitters.emit(ExplosionEvent {
                                 pos: pos.0 + offset,
                                 explosion: e,
                                 owner: projectile.owner,
                             });
                         },
                         projectile::Effect::Vanish => {
-                            server_emitter.emit(ServerEvent::Delete(entity));
+                            emitters.emit(DeleteEvent(entity));
                             projectile_vanished = true;
                         },
                         projectile::Effect::Bonk => {
-                            server_emitter.emit(ServerEvent::Bonk {
+                            emitters.emit(BonkEvent {
                                 pos: pos.0,
                                 owner: projectile.owner,
                                 target: None,
@@ -231,7 +254,7 @@ impl<'a> System<'a> for Sys {
             }
 
             if projectile.time_left == Duration::default() {
-                server_emitter.emit(ServerEvent::Delete(entity));
+                emitters.emit(DeleteEvent(entity));
             }
             projectile.time_left = projectile
                 .time_left
@@ -264,7 +287,7 @@ fn dispatch_hit(
     read_data: &ReadData,
     projectile_vanished: &mut bool,
     outcomes_emitter: &mut Emitter<Outcome>,
-    server_emitter: &mut Emitter<ServerEvent>,
+    emitters: &mut Emitters,
     rng: &mut rand::rngs::ThreadRng,
 ) {
     match projectile_info.effect {
@@ -437,7 +460,7 @@ fn dispatch_hit(
                 1.0,
                 AttackSource::Projectile,
                 *read_data.time,
-                |e| server_emitter.emit(e),
+                emitters,
                 |o| outcomes_emitter.emit(o),
                 rng,
                 0,
@@ -446,7 +469,7 @@ fn dispatch_hit(
         projectile::Effect::Explode(e) => {
             let Pos(pos) = *projectile_info.pos;
             let owner_uid = projectile_info.owner_uid;
-            server_emitter.emit(ServerEvent::Explosion {
+            emitters.emit(ExplosionEvent {
                 pos,
                 explosion: e,
                 owner: owner_uid,
@@ -455,7 +478,7 @@ fn dispatch_hit(
         projectile::Effect::Bonk => {
             let Pos(pos) = *projectile_info.pos;
             let owner_uid = projectile_info.owner_uid;
-            server_emitter.emit(ServerEvent::Bonk {
+            emitters.emit(BonkEvent {
                 pos,
                 owner: owner_uid,
                 target: Some(projectile_target_info.uid),
@@ -463,7 +486,7 @@ fn dispatch_hit(
         },
         projectile::Effect::Vanish => {
             let entity = projectile_info.entity;
-            server_emitter.emit(ServerEvent::Delete(entity));
+            emitters.emit(DeleteEvent(entity));
             *projectile_vanished = true;
         },
         projectile::Effect::Possess => {
@@ -471,7 +494,7 @@ fn dispatch_hit(
             let owner_uid = projectile_info.owner_uid;
             if let Some(owner_uid) = owner_uid {
                 if target_uid != owner_uid {
-                    server_emitter.emit(ServerEvent::Possess(owner_uid, target_uid));
+                    emitters.emit(PossessEvent(owner_uid, target_uid));
                 }
             }
         },

common/systems/src/shockwave.rs

@@ -6,7 +6,12 @@ use common::{
         Alignment, Body, Buffs, CharacterState, Combo, Energy, Group, Health, Inventory, Ori,
         PhysicsState, Player, Pos, Scale, Shockwave, ShockwaveHitEntities, Stats,
     },
-    event::{EventBus, ServerEvent},
+    event::{
+        BuffEvent, ComboChangeEvent, DeleteEvent, EmitExt, EnergyChangeEvent,
+        EntityAttackedHookEvent, EventBus, HealthChangeEvent, KnockbackEvent, MineBlockEvent,
+        ParryHookEvent, PoiseChangeEvent, SoundEvent,
+    },
+    event_emitters,
     outcome::Outcome,
     resources::{DeltaTime, Time},
     uid::{IdMaps, Uid},
@@ -18,10 +23,26 @@ use rand::Rng;
 use specs::{shred, Entities, Join, LendJoin, Read, ReadStorage, SystemData, WriteStorage};
 use vek::*;
 
+event_emitters! {
+    struct Events[Emitters] {
+        health_change: HealthChangeEvent,
+        energy_change: EnergyChangeEvent,
+        poise_change: PoiseChangeEvent,
+        sound: SoundEvent,
+        mine_block: MineBlockEvent,
+        parry_hook: ParryHookEvent,
+        kockback: KnockbackEvent,
+        entity_attack_hoow: EntityAttackedHookEvent,
+        combo_change: ComboChangeEvent,
+        buff: BuffEvent,
+        delete: DeleteEvent,
+    }
+}
+
 #[derive(SystemData)]
 pub struct ReadData<'a> {
     entities: Entities<'a>,
-    server_bus: Read<'a, EventBus<ServerEvent>>,
+    events: Events<'a>,
     time: Read<'a, Time>,
     players: ReadStorage<'a, Player>,
     dt: Read<'a, DeltaTime>,
@@ -63,7 +84,7 @@ impl<'a> System<'a> for Sys {
         _job: &mut Job<Self>,
         (read_data, mut shockwaves, mut shockwave_hit_lists, outcomes): Self::SystemData,
     ) {
-        let mut server_emitter = read_data.server_bus.emitter();
+        let mut emitters = read_data.events.get_emitters();
         let mut outcomes_emitter = outcomes.emitter();
         let mut rng = rand::thread_rng();
 
@@ -93,7 +114,7 @@ impl<'a> System<'a> for Sys {
                 .and_then(|uid| read_data.id_maps.uid_entity(uid));
 
             if rng.gen_bool(0.05) {
-                server_emitter.emit(ServerEvent::Sound {
+                emitters.emit(SoundEvent {
                     sound: Sound::new(SoundKind::Shockwave, pos.0, 40.0, time),
                 });
             }
@@ -101,7 +122,7 @@ impl<'a> System<'a> for Sys {
             // If shockwave is out of time emit destroy event but still continue since it
             // may have traveled and produced effects a bit before reaching it's end point
             if time > end_time {
-                server_emitter.emit(ServerEvent::Delete(entity));
+                emitters.emit(DeleteEvent(entity));
                 continue;
             }
 
@@ -249,7 +270,7 @@ impl<'a> System<'a> for Sys {
                         1.0,
                         shockwave.dodgeable.to_attack_source(),
                         *read_data.time,
-                        |e| server_emitter.emit(e),
+                        &mut emitters,
                         |o| outcomes_emitter.emit(o),
                         &mut rng,
                         0,

common/systems/src/stats.rs

@@ -7,7 +7,8 @@ use common::{
         Body, CharacterState, Combo, Energy, Health, Inventory, Poise, Pos, SkillSet, Stats,
         StatsModifier,
     },
-    event::{EventBus, ServerEvent},
+    event::{DestroyEvent, EmitExt},
+    event_emitters,
     resources::{DeltaTime, EntitiesDiedLastTick, Time},
 };
 use common_ecs::{Job, Origin, Phase, System};
@@ -19,12 +20,18 @@ const ENERGY_REGEN_ACCEL: f32 = 1.0;
 const SIT_ENERGY_REGEN_ACCEL: f32 = 2.5;
 const POISE_REGEN_ACCEL: f32 = 2.0;
 
+event_emitters! {
+    struct Events[Emitters] {
+        destroy: DestroyEvent,
+    }
+}
+
 #[derive(SystemData)]
 pub struct ReadData<'a> {
     entities: Entities<'a>,
     dt: Read<'a, DeltaTime>,
     time: Read<'a, Time>,
-    server_bus: Read<'a, EventBus<ServerEvent>>,
+    events: Events<'a>,
     positions: ReadStorage<'a, Pos>,
     bodies: ReadStorage<'a, Body>,
     char_states: ReadStorage<'a, CharacterState>,
@@ -65,7 +72,7 @@ impl<'a> System<'a> for Sys {
         ): Self::SystemData,
     ) {
         entities_died_last_tick.0.clear();
-        let mut server_event_emitter = read_data.server_bus.emitter();
+        let mut emitters = read_data.events.get_emitters();
         let dt = read_data.dt.0;
 
         // Update stats
@@ -84,7 +91,7 @@ impl<'a> System<'a> for Sys {
             if set_dead {
                 let cloned_entity = (entity, *pos);
                 entities_died_last_tick.0.push(cloned_entity);
-                server_event_emitter.emit(ServerEvent::Destroy {
+                emitters.emit(DestroyEvent {
                     entity,
                     cause: health.last_change,
                 });

server/agent/src/action_nodes.rs

@@ -3,7 +3,7 @@ use crate::{
         AVG_FOLLOW_DIST, DEFAULT_ATTACK_RANGE, IDLE_HEALING_ITEM_THRESHOLD, MAX_PATROL_DIST,
         PARTIAL_PATH_DIST, SEPARATION_BIAS, SEPARATION_DIST, STD_AWARENESS_DECAY_RATE,
     },
-    data::{AgentData, AttackData, Path, ReadData, Tactic, TargetData},
+    data::{AgentData, AgentEmitters, AttackData, Path, ReadData, Tactic, TargetData},
     util::{
         aim_projectile, are_our_owners_hostile, entities_have_line_of_sight, get_attacker,
         get_entity_by_id, is_dead_or_invulnerable, is_dressed_as_cultist, is_invulnerable,
@@ -28,7 +28,7 @@ use common::{
     },
     consts::MAX_MOUNT_RANGE,
     effect::{BuffEffect, Effect},
-    event::{Emitter, ServerEvent},
+    event::{ChatEvent, EmitExt, SoundEvent},
     mounting::VolumePos,
     path::TraversalConfig,
     rtsim::NpcActivity,
@@ -180,7 +180,7 @@ impl<'a> AgentData<'a> {
         agent: &mut Agent,
         controller: &mut Controller,
         read_data: &ReadData,
-        event_emitter: &mut Emitter<ServerEvent>,
+        emitters: &mut AgentEmitters,
         rng: &mut impl Rng,
     ) {
         enum ActionTimers {
@@ -430,7 +430,7 @@ impl<'a> AgentData<'a> {
                             agent,
                             controller,
                             read_data,
-                            event_emitter,
+                            emitters,
                             AgentData::is_hunting_animal,
                         );
                     }
@@ -807,7 +807,7 @@ impl<'a> AgentData<'a> {
         agent: &mut Agent,
         controller: &mut Controller,
         read_data: &ReadData,
-        event_emitter: &mut Emitter<ServerEvent>,
+        emitters: &mut AgentEmitters,
         is_enemy: fn(&Self, EcsEntity, &ReadData) -> bool,
     ) {
         enum ActionStateTimers {
@@ -856,7 +856,7 @@ impl<'a> AgentData<'a> {
                     self.chat_npc_if_allowed_to_speak(
                         Content::localized("npc-speech-ambush"),
                         agent,
-                        event_emitter,
+                        emitters,
                     );
                     aggro_on = true;
                     Some((entity, true))
@@ -1666,13 +1666,13 @@ impl<'a> AgentData<'a> {
         agent: &mut Agent,
         controller: &mut Controller,
         read_data: &ReadData,
-        event_emitter: &mut Emitter<ServerEvent>,
+        emitters: &mut AgentEmitters,
         rng: &mut impl Rng,
     ) {
         agent.forget_old_sounds(read_data.time.0);
 
         if is_invulnerable(*self.entity, read_data) {
-            self.idle(agent, controller, read_data, event_emitter, rng);
+            self.idle(agent, controller, read_data, emitters, rng);
             return;
         }
 
@@ -1705,13 +1705,13 @@ impl<'a> AgentData<'a> {
                 } else if self.below_flee_health(agent) || !follows_threatening_sounds {
                     self.flee(agent, controller, read_data, &sound_pos);
                 } else {
-                    self.idle(agent, controller, read_data, event_emitter, rng);
+                    self.idle(agent, controller, read_data, emitters, rng);
                 }
             } else {
-                self.idle(agent, controller, read_data, event_emitter, rng);
+                self.idle(agent, controller, read_data, emitters, rng);
             }
         } else {
-            self.idle(agent, controller, read_data, event_emitter, rng);
+            self.idle(agent, controller, read_data, emitters, rng);
         }
     }
 
@@ -1720,7 +1720,7 @@ impl<'a> AgentData<'a> {
         agent: &mut Agent,
         read_data: &ReadData,
         controller: &mut Controller,
-        event_emitter: &mut Emitter<ServerEvent>,
+        emitters: &mut AgentEmitters,
         rng: &mut impl Rng,
     ) {
         if let Some(Target { target, .. }) = agent.target {
@@ -1750,7 +1750,7 @@ impl<'a> AgentData<'a> {
                                     Some(tgt_pos.0),
                                 ));
 
-                                self.idle(agent, controller, read_data, event_emitter, rng);
+                                self.idle(agent, controller, read_data, emitters, rng);
                             } else {
                                 let target_data = TargetData::new(tgt_pos, target, read_data);
                                 // TODO: Reimplement this in rtsim
@@ -1774,25 +1774,23 @@ impl<'a> AgentData<'a> {
         &self,
         msg: Content,
         agent: &Agent,
-        event_emitter: &mut Emitter<'_, ServerEvent>,
+        emitters: &mut AgentEmitters,
     ) -> bool {
         if agent.allowed_to_speak() {
-            self.chat_npc(msg, event_emitter);
+            self.chat_npc(msg, emitters);
             true
         } else {
             false
         }
     }
 
-    pub fn chat_npc(&self, content: Content, event_emitter: &mut Emitter<'_, ServerEvent>) {
-        event_emitter.emit(ServerEvent::Chat(UnresolvedChatMsg::npc(
-            *self.uid, content,
-        )));
+    pub fn chat_npc(&self, content: Content, emitters: &mut AgentEmitters) {
+        emitters.emit(ChatEvent(UnresolvedChatMsg::npc(*self.uid, content)));
     }
 
-    fn emit_scream(&self, time: f64, event_emitter: &mut Emitter<'_, ServerEvent>) {
+    fn emit_scream(&self, time: f64, emitters: &mut AgentEmitters) {
         if let Some(body) = self.body {
-            event_emitter.emit(ServerEvent::Sound {
+            emitters.emit(SoundEvent {
                 sound: Sound::new(
                     SoundKind::Utterance(UtteranceKind::Scream, *body),
                     self.pos.0,
@@ -1803,12 +1801,7 @@ impl<'a> AgentData<'a> {
         }
     }
 
-    pub fn cry_out(
-        &self,
-        agent: &Agent,
-        event_emitter: &mut Emitter<'_, ServerEvent>,
-        read_data: &ReadData,
-    ) {
+    pub fn cry_out(&self, agent: &Agent, emitters: &mut AgentEmitters, read_data: &ReadData) {
         let has_enemy_alignment = matches!(self.alignment, Some(Alignment::Enemy));
 
         if has_enemy_alignment {
@@ -1817,28 +1810,24 @@ impl<'a> AgentData<'a> {
             self.chat_npc_if_allowed_to_speak(
                 Content::localized("npc-speech-cultist_low_health_fleeing"),
                 agent,
-                event_emitter,
+                emitters,
             );
         } else if is_villager(self.alignment) {
             self.chat_npc_if_allowed_to_speak(
                 Content::localized("npc-speech-villager_under_attack"),
                 agent,
-                event_emitter,
+                emitters,
             );
-            self.emit_scream(read_data.time.0, event_emitter);
+            self.emit_scream(read_data.time.0, emitters);
         }
     }
 
-    pub fn exclaim_relief_about_enemy_dead(
-        &self,
-        agent: &Agent,
-        event_emitter: &mut Emitter<'_, ServerEvent>,
-    ) {
+    pub fn exclaim_relief_about_enemy_dead(&self, agent: &Agent, emitters: &mut AgentEmitters) {
         if is_villager(self.alignment) {
             self.chat_npc_if_allowed_to_speak(
                 Content::localized("npc-speech-villager_enemy_killed"),
                 agent,
-                event_emitter,
+                emitters,
             );
         }
     }
@@ -2002,7 +1991,7 @@ impl<'a> AgentData<'a> {
         controller: &mut Controller,
         target: EcsEntity,
         read_data: &ReadData,
-        event_emitter: &mut Emitter<ServerEvent>,
+        emitters: &mut AgentEmitters,
         rng: &mut impl Rng,
         remembers_fight_with_target: bool,
     ) {
@@ -2011,7 +2000,7 @@ impl<'a> AgentData<'a> {
         let move_dir_mag = move_dir.magnitude();
         let small_chance = rng.gen::<f32>() < read_data.dt.0 * 0.25;
         let mut chat = |content: Content| {
-            self.chat_npc_if_allowed_to_speak(content, agent, event_emitter);
+            self.chat_npc_if_allowed_to_speak(content, agent, emitters);
         };
         let mut chat_villager_remembers_fighting = || {
             let tgt_name = read_data.stats.get(target).map(|stats| stats.name.clone());

server/agent/src/data.rs

@@ -17,6 +17,7 @@ use common::{
         Stats, Vel,
     },
     consts::GRAVITY,
+    event, event_emitters,
     link::Is,
     mounting::{Mount, Rider, VolumeRider},
     path::TraversalConfig,
@@ -28,6 +29,14 @@ use common::{
 };
 use specs::{shred, Entities, Entity as EcsEntity, Read, ReadExpect, ReadStorage, SystemData};
 
+event_emitters! {
+    pub struct AgentEvents[AgentEmitters] {
+        chat: event::ChatEvent,
+        sound: event::SoundEvent,
+        process_trade_action: event::ProcessTradeActionEvent,
+    }
+}
+
 // TODO: Move rtsim back into AgentData after rtsim2 when it has a separate
 // crate
 pub struct AgentData<'a> {

server/src/cmd.rs

@@ -40,7 +40,10 @@ use common::{
     },
     depot,
     effect::Effect,
-    event::{EventBus, ServerEvent},
+    event::{
+        ClientDisconnectEvent, CreateWaypointEvent, EventBus, ExplosionEvent, GroupManipEvent,
+        InitiateInviteEvent, TamePetEvent,
+    },
     generation::{EntityConfig, EntityInfo},
     link::Is,
     mounting::{Rider, Volume, VolumeRider},
@@ -1804,9 +1807,7 @@ fn handle_spawn(
 
                 // Add to group system if a pet
                 if matches!(alignment, comp::Alignment::Owned { .. }) {
-                    let server_eventbus =
-                        server.state.ecs().read_resource::<EventBus<ServerEvent>>();
-                    server_eventbus.emit_now(ServerEvent::TamePet {
+                    server.state.emit_event_now(TamePetEvent {
                         owner_entity: target,
                         pet_entity: new_entity,
                     });
@@ -2079,8 +2080,8 @@ fn handle_spawn_campfire(
     server
         .state
         .ecs()
-        .read_resource::<EventBus<ServerEvent>>()
-        .emit_now(ServerEvent::CreateWaypoint(pos.0));
+        .read_resource::<EventBus<CreateWaypointEvent>>()
+        .emit_now(CreateWaypointEvent(pos.0));
 
     server.notify_client(
         client,
@@ -2907,10 +2908,7 @@ fn handle_explosion(
         .read_storage::<Uid>()
         .get(target)
         .copied();
-    server
-        .state
-        .mut_resource::<EventBus<ServerEvent>>()
-        .emit_now(ServerEvent::Explosion {
+    server.state.emit_event_now(ExplosionEvent {
         pos: pos.0,
         explosion: Explosion {
             effects: vec![
@@ -3261,8 +3259,7 @@ fn handle_group_invite(
 
         server
             .state
-            .mut_resource::<EventBus<ServerEvent>>()
-            .emit_now(ServerEvent::InitiateInvite(target, uid, InviteKind::Group));
+            .emit_event_now(InitiateInviteEvent(target, uid, InviteKind::Group));
 
         if client != target {
             server.notify_client(
@@ -3301,8 +3298,7 @@ fn handle_group_kick(
 
         server
             .state
-            .mut_resource::<EventBus<ServerEvent>>()
-            .emit_now(ServerEvent::GroupManip(target, comp::GroupManip::Kick(uid)));
+            .emit_event_now(GroupManipEvent(target, comp::GroupManip::Kick(uid)));
         Ok(())
     } else {
         Err(Content::Plain(action.help_string()))
@@ -3318,8 +3314,7 @@ fn handle_group_leave(
 ) -> CmdResult<()> {
     server
         .state
-        .mut_resource::<EventBus<ServerEvent>>()
-        .emit_now(ServerEvent::GroupManip(target, comp::GroupManip::Leave));
+        .emit_event_now(GroupManipEvent(target, comp::GroupManip::Leave));
     Ok(())
 }
 
@@ -3337,11 +3332,7 @@ fn handle_group_promote(
 
         server
             .state
-            .mut_resource::<EventBus<ServerEvent>>()
-            .emit_now(ServerEvent::GroupManip(
-                target,
-                comp::GroupManip::AssignLeader(uid),
-            ));
+            .emit_event_now(GroupManipEvent(target, comp::GroupManip::AssignLeader(uid)));
         Ok(())
     } else {
         Err(Content::Plain(action.help_string()))
@@ -3944,8 +3935,8 @@ fn kick_player(
     );
     server
         .state
-        .mut_resource::<EventBus<ServerEvent>>()
-        .emit_now(ServerEvent::ClientDisconnect(
+        .mut_resource::<EventBus<ClientDisconnectEvent>>()
+        .emit_now(ClientDisconnectEvent(
             target_player,
             comp::DisconnectReason::Kicked,
         ));

server/src/events/entity_creation.rs

@@ -3,25 +3,24 @@ use crate::{
     presence::RepositionOnChunkLoad, sys, CharacterUpdater, Server, StateExt,
 };
 use common::{
-    character::CharacterId,
     comp::{
         self,
         aura::{Aura, AuraKind, AuraTarget},
         buff::{BuffCategory, BuffData, BuffKind, BuffSource},
-        misc::PortalData,
         ship::figuredata::VOXEL_COLLIDER_MANIFEST,
-        shockwave, Alignment, BehaviorCapability, Body, ItemDrops, LightEmitter, Object, Ori, Pos,
-        Projectile, TradingBehavior, Vel, WaypointArea,
+        Alignment, BehaviorCapability, ItemDrops, LightEmitter, Ori, Pos, TradingBehavior, Vel,
+        WaypointArea,
+    },
+    event::{
+        CreateNpcEvent, CreateShipEvent, CreateTeleporterEvent, CreateWaypointEvent, EventBus,
+        InitializeCharacterEvent, InitializeSpectatorEvent, ShockwaveEvent, ShootEvent,
+        UpdateCharacterDataEvent,
     },
-    event::{EventBus, NpcBuilder, UpdateCharacterMetadata},
     mounting::{Mounting, Volume, VolumeMounting, VolumePos},
     outcome::Outcome,
     resources::{Secs, Time},
-    rtsim::RtSimEntity,
     uid::{IdMaps, Uid},
-    util::Dir,
     vol::IntoFullVolIterator,
-    ViewDistances,
 };
 use common_net::{msg::ServerGeneral, sync::WorldSyncExt};
 use specs::{Builder, Entity as EcsEntity, WorldExt};
@@ -29,56 +28,57 @@ use vek::{Rgb, Vec3};
 
 use super::group_manip::update_map_markers;
 
-pub fn handle_initialize_character(
-    server: &mut Server,
-    entity: EcsEntity,
-    character_id: CharacterId,
-    requested_view_distances: ViewDistances,
-) {
+pub fn handle_initialize_character(server: &mut Server, ev: InitializeCharacterEvent) {
     let updater = server.state.ecs().fetch::<CharacterUpdater>();
-    let pending_database_action = updater.has_pending_database_action(character_id);
+    let pending_database_action = updater.has_pending_database_action(ev.character_id);
     drop(updater);
 
     if !pending_database_action {
-        let clamped_vds = requested_view_distances.clamp(server.settings().max_view_distance);
+        let clamped_vds = ev
+            .requested_view_distances
+            .clamp(server.settings().max_view_distance);
         server
             .state
-            .initialize_character_data(entity, character_id, clamped_vds);
+            .initialize_character_data(ev.entity, ev.character_id, clamped_vds);
         // Correct client if its requested VD is too high.
-        if requested_view_distances.terrain != clamped_vds.terrain {
-            server.notify_client(entity, ServerGeneral::SetViewDistance(clamped_vds.terrain));
+        if ev.requested_view_distances.terrain != clamped_vds.terrain {
+            server.notify_client(
+                ev.entity,
+                ServerGeneral::SetViewDistance(clamped_vds.terrain),
+            );
         }
     } else {
         // A character delete or update was somehow initiated after the login commenced,
         // so kick the client out of "ingame" without saving any data and abort
         // the character loading process.
-        handle_exit_ingame(server, entity, true);
+        handle_exit_ingame(server, ev.entity, true);
     }
 }
 
-pub fn handle_initialize_spectator(
-    server: &mut Server,
-    entity: EcsEntity,
-    requested_view_distances: ViewDistances,
-) {
-    let clamped_vds = requested_view_distances.clamp(server.settings().max_view_distance);
-    server.state.initialize_spectator_data(entity, clamped_vds);
+pub fn handle_initialize_spectator(server: &mut Server, ev: InitializeSpectatorEvent) {
+    let clamped_vds = ev.1.clamp(server.settings().max_view_distance);
+    server.state.initialize_spectator_data(ev.0, clamped_vds);
     // Correct client if its requested VD is too high.
-    if requested_view_distances.terrain != clamped_vds.terrain {
-        server.notify_client(entity, ServerGeneral::SetViewDistance(clamped_vds.terrain));
+    if ev.1.terrain != clamped_vds.terrain {
+        server.notify_client(ev.0, ServerGeneral::SetViewDistance(clamped_vds.terrain));
     }
-    sys::subscription::initialize_region_subscription(server.state.ecs(), entity);
+    sys::subscription::initialize_region_subscription(server.state.ecs(), ev.0);
 }
 
-pub fn handle_loaded_character_data(
-    server: &mut Server,
-    entity: EcsEntity,
-    loaded_components: PersistedComponents,
-    metadata: UpdateCharacterMetadata,
-) {
+pub fn handle_loaded_character_data(server: &mut Server, ev: UpdateCharacterDataEvent) {
+    let loaded_components = PersistedComponents {
+        body: ev.components.0,
+        stats: ev.components.1,
+        skill_set: ev.components.2,
+        inventory: ev.components.3,
+        waypoint: ev.components.4,
+        pets: ev.components.5,
+        active_abilities: ev.components.6,
+        map_marker: ev.components.7,
+    };
     if let Some(marker) = loaded_components.map_marker {
         server.notify_client(
-            entity,
+            ev.entity,
             ServerGeneral::MapMarker(comp::MapMarkerUpdate::Owned(comp::MapMarkerChange::Update(
                 marker.0,
             ))),
@@ -87,68 +87,62 @@ pub fn handle_loaded_character_data(
 
     let result_msg = if let Err(err) = server
         .state
-        .update_character_data(entity, loaded_components)
+        .update_character_data(ev.entity, loaded_components)
     {
-        handle_exit_ingame(server, entity, false); // remove client from in-game state
+        handle_exit_ingame(server, ev.entity, false); // remove client from in-game state
         ServerGeneral::CharacterDataLoadResult(Err(err))
     } else {
-        sys::subscription::initialize_region_subscription(server.state.ecs(), entity);
+        sys::subscription::initialize_region_subscription(server.state.ecs(), ev.entity);
         // We notify the client with the metadata result from the operation.
-        ServerGeneral::CharacterDataLoadResult(Ok(metadata))
+        ServerGeneral::CharacterDataLoadResult(Ok(ev.metadata))
     };
-    server.notify_client(entity, result_msg);
+    server.notify_client(ev.entity, result_msg);
 }
 
-pub fn handle_create_npc(
-    server: &mut Server,
-    pos: Pos,
-    ori: Ori,
-    mut npc: NpcBuilder,
-    rider: Option<NpcBuilder>,
-) -> EcsEntity {
+pub fn handle_create_npc(server: &mut Server, mut ev: CreateNpcEvent) -> EcsEntity {
     let entity = server
         .state
         .create_npc(
-            pos,
-            ori,
-            npc.stats,
-            npc.skill_set,
-            npc.health,
-            npc.poise,
-            npc.inventory,
-            npc.body,
+            ev.pos,
+            ev.ori,
+            ev.npc.stats,
+            ev.npc.skill_set,
+            ev.npc.health,
+            ev.npc.poise,
+            ev.npc.inventory,
+            ev.npc.body,
         )
-        .with(npc.scale);
+        .with(ev.npc.scale);
 
-    if let Some(agent) = &mut npc.agent {
-        if let Alignment::Owned(_) = &npc.alignment {
+    if let Some(agent) = &mut ev.npc.agent {
+        if let Alignment::Owned(_) = &ev.npc.alignment {
             agent.behavior.allow(BehaviorCapability::TRADE);
             agent.behavior.trading_behavior = TradingBehavior::AcceptFood;
         }
     }
 
-    let entity = entity.with(npc.alignment);
+    let entity = entity.with(ev.npc.alignment);
 
-    let entity = if let Some(agent) = npc.agent {
+    let entity = if let Some(agent) = ev.npc.agent {
         entity.with(agent)
     } else {
         entity
     };
 
-    let entity = if let Some(drop_items) = npc.loot.to_items() {
+    let entity = if let Some(drop_items) = ev.npc.loot.to_items() {
         entity.with(ItemDrops(drop_items))
     } else {
         entity
     };
 
-    let entity = if let Some(home_chunk) = npc.anchor {
+    let entity = if let Some(home_chunk) = ev.npc.anchor {
         entity.with(home_chunk)
     } else {
         entity
     };
 
     // Rtsim entity added to IdMaps below.
-    let entity = if let Some(rtsim_entity) = npc.rtsim_entity {
+    let entity = if let Some(rtsim_entity) = ev.npc.rtsim_entity {
         entity.with(rtsim_entity).with(RepositionOnChunkLoad {
             needs_ground: false,
         })
@@ -156,7 +150,7 @@ pub fn handle_create_npc(
         entity
     };
 
-    let entity = if let Some(projectile) = npc.projectile {
+    let entity = if let Some(projectile) = ev.npc.projectile {
         entity.with(projectile)
     } else {
         entity
@@ -164,7 +158,7 @@ pub fn handle_create_npc(
 
     let new_entity = entity.build();
 
-    if let Some(rtsim_entity) = npc.rtsim_entity {
+    if let Some(rtsim_entity) = ev.npc.rtsim_entity {
         server
             .state()
             .ecs()
@@ -173,7 +167,7 @@ pub fn handle_create_npc(
     }
 
     // Add to group system if a pet
-    if let comp::Alignment::Owned(owner_uid) = npc.alignment {
+    if let comp::Alignment::Owned(owner_uid) = ev.npc.alignment {
         let state = server.state();
         let uids = state.ecs().read_storage::<Uid>();
         let clients = state.ecs().read_storage::<Client>();
@@ -204,7 +198,7 @@ pub fn handle_create_npc(
                 },
             );
         }
-    } else if let Some(group) = match npc.alignment {
+    } else if let Some(group) = match ev.npc.alignment {
         Alignment::Wild => None,
         Alignment::Passive => None,
         Alignment::Enemy => Some(comp::group::ENEMY),
@@ -214,8 +208,13 @@ pub fn handle_create_npc(
         let _ = server.state.ecs().write_storage().insert(new_entity, group);
     }
 
-    if let Some(rider) = rider {
-        let rider_entity = handle_create_npc(server, pos, Ori::default(), rider, None);
+    if let Some(rider) = ev.rider {
+        let rider_entity = handle_create_npc(server, CreateNpcEvent {
+            pos: ev.pos,
+            ori: Ori::default(),
+            npc: rider,
+            rider: None,
+        });
         let uids = server.state().ecs().read_storage::<Uid>();
         let link = Mounting {
             mount: *uids.get(new_entity).expect("We just created this entity"),
@@ -231,21 +230,13 @@ pub fn handle_create_npc(
     new_entity
 }
 
-pub fn handle_create_ship(
-    server: &mut Server,
-    pos: Pos,
-    ori: Ori,
-    ship: comp::ship::Body,
-    rtsim_entity: Option<RtSimEntity>,
-    driver: Option<NpcBuilder>,
-    passengers: Vec<NpcBuilder>,
-) {
-    let collider = ship.make_collider();
+pub fn handle_create_ship(server: &mut Server, ev: CreateShipEvent) {
+    let collider = ev.ship.make_collider();
     let voxel_colliders_manifest = VOXEL_COLLIDER_MANIFEST.read();
 
     // TODO: Find better solution for this, maybe something like a serverside block
     // of interests.
-    let (mut steering, mut seats) = {
+    let (mut steering, mut _seats) = {
         let mut steering = Vec::new();
         let mut seats = Vec::new();
 
@@ -263,7 +254,9 @@ pub fn handle_create_ship(
         (steering.into_iter(), seats.into_iter())
     };
 
-    let mut entity = server.state.create_ship(pos, ori, ship, |_| collider);
+    let mut entity = server
+        .state
+        .create_ship(ev.pos, ev.ori, ev.ship, |_| collider);
     /*
     if let Some(mut agent) = agent {
         let (kp, ki, kd) = pid_coefficients(&Body::Ship(ship));
@@ -273,13 +266,18 @@ pub fn handle_create_ship(
         entity = entity.with(agent);
     }
     */
-    if let Some(rtsim_vehicle) = rtsim_entity {
+    if let Some(rtsim_vehicle) = ev.rtsim_entity {
         entity = entity.with(rtsim_vehicle);
     }
     let entity = entity.build();
 
-    if let Some(driver) = driver {
-        let npc_entity = handle_create_npc(server, pos, ori, driver, None);
+    if let Some(driver) = ev.driver {
+        let npc_entity = handle_create_npc(server, CreateNpcEvent {
+            pos: ev.pos,
+            ori: ev.ori,
+            npc: driver,
+            rider: None,
+        });
 
         let uids = server.state.ecs().read_storage::<Uid>();
         let (rider_uid, mount_uid) = uids
@@ -312,14 +310,14 @@ pub fn handle_create_ship(
         }
     }
 
-    for passenger in passengers {
-        let npc_entity = handle_create_npc(
-            server,
-            Pos(pos.0 + Vec3::unit_z() * 5.0),
-            ori,
-            passenger,
-            None,
-        );
+    /*
+    for passenger in ev.passengers {
+        let npc_entity = handle_create_npc(server, CreateNpcEvent {
+            pos: Pos(ev.pos.0 + Vec3::unit_z() * 5.0),
+            ori: ev.ori,
+            npc: passenger,
+            rider: None,
+        });
         if let Some((rider_pos, rider_block)) = seats.next() {
             let uids = server.state.ecs().read_storage::<Uid>();
             let (rider_uid, mount_uid) = uids
@@ -342,62 +340,54 @@ pub fn handle_create_ship(
                 .expect("Failed to link passanger to ship");
         }
     }
+    */
 }
 
-pub fn handle_shoot(
-    server: &mut Server,
-    entity: EcsEntity,
-    pos: Pos,
-    dir: Dir,
-    body: Body,
-    light: Option<LightEmitter>,
-    projectile: Projectile,
-    speed: f32,
-    object: Option<Object>,
-) {
+pub fn handle_shoot(server: &mut Server, ev: ShootEvent) {
     let state = server.state_mut();
 
-    let pos = pos.0;
+    let pos = ev.pos.0;
 
-    let vel = *dir * speed
+    let vel = *ev.dir * ev.speed
         + state
             .ecs()
             .read_storage::<Vel>()
-            .get(entity)
+            .get(ev.entity)
             .map_or(Vec3::zero(), |v| v.0);
 
     // Add an outcome
     state
         .ecs()
         .read_resource::<EventBus<Outcome>>()
-        .emit_now(Outcome::ProjectileShot { pos, body, vel });
+        .emit_now(Outcome::ProjectileShot {
+            pos,
+            body: ev.body,
+            vel,
+        });
 
-    let mut builder = state.create_projectile(Pos(pos), Vel(vel), body, projectile);
-    if let Some(light) = light {
+    let mut builder = state.create_projectile(Pos(pos), Vel(vel), ev.body, ev.projectile);
+    if let Some(light) = ev.light {
         builder = builder.with(light)
     }
-    if let Some(object) = object {
+    if let Some(object) = ev.object {
         builder = builder.with(object)
     }
 
     builder.build();
 }
 
-pub fn handle_shockwave(
-    server: &mut Server,
-    properties: shockwave::Properties,
-    pos: Pos,
-    ori: Ori,
-) {
+pub fn handle_shockwave(server: &mut Server, ev: ShockwaveEvent) {
     let state = server.state_mut();
-    state.create_shockwave(properties, pos, ori).build();
+    state
+        .create_shockwave(ev.properties, ev.pos, ev.ori)
+        .build();
 }
 
-pub fn handle_create_waypoint(server: &mut Server, pos: Vec3<f32>) {
+pub fn handle_create_waypoint(server: &mut Server, ev: CreateWaypointEvent) {
     let time = server.state.get_time();
     server
         .state
-        .create_object(Pos(pos), comp::object::Body::CampfireLit)
+        .create_object(Pos(ev.0), comp::object::Body::CampfireLit)
         .with(LightEmitter {
             col: Rgb::new(1.0, 0.3, 0.1),
             strength: 5.0,
@@ -435,9 +425,9 @@ pub fn handle_create_waypoint(server: &mut Server, pos: Vec3<f32>) {
         .build();
 }
 
-pub fn handle_create_teleporter(server: &mut Server, pos: Vec3<f32>, portal: PortalData) {
+pub fn handle_create_teleporter(server: &mut Server, ev: CreateTeleporterEvent) {
     server
         .state
-        .create_teleporter(comp::Pos(pos), portal)
+        .create_teleporter(comp::Pos(ev.0), ev.1)
         .build();
 }

server/src/events/group_manip.rs

@@ -1,4 +1,4 @@
-use crate::{client::Client, Server};
+use crate::client::Client;
 use common::{
     comp::{
         self,
@@ -6,26 +6,24 @@ use common::{
         invite::{InviteKind, PendingInvites},
         ChatType, GroupManip,
     },
-    uid::Uid,
-};
-use common_net::{msg::ServerGeneral, sync::WorldSyncExt};
-use common_state::State;
-use specs::{
-    world::{Entity, WorldExt},
-    ReadStorage, WriteStorage,
+    event::GroupManipEvent,
+    uid::{IdMaps, Uid},
 };
+use common_net::msg::ServerGeneral;
+use specs::{world::Entity, Entities, ReadExpect, ReadStorage, WriteExpect, WriteStorage};
+
+use super::ServerEvent;
 
 pub fn can_invite(
-    state: &State,
     clients: &ReadStorage<'_, Client>,
+    groups: &ReadStorage<'_, Group>,
+    group_manager: &GroupManager,
     pending_invites: &mut WriteStorage<'_, PendingInvites>,
     max_group_size: u32,
     inviter: Entity,
     invitee: Entity,
 ) -> bool {
     // Disallow inviting entity that is already in your group
-    let groups = state.ecs().read_storage::<Group>();
-    let group_manager = state.ecs().read_resource::<GroupManager>();
     let already_in_same_group = groups.get(inviter).map_or(false, |group| {
         group_manager
             .group_info(*group)
@@ -45,9 +43,7 @@ pub fn can_invite(
 
     // Check if group max size is already reached
     // Adding the current number of pending invites
-    let group_size_limit_reached = state
-        .ecs()
-        .read_storage()
+    let group_size_limit_reached = groups
         .get(inviter)
         .copied()
         .and_then(|group| {
@@ -112,21 +108,31 @@ pub fn update_map_markers<'a>(
     }
 }
 
-// TODO: turn chat messages into enums
-pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
+impl ServerEvent for GroupManipEvent {
+    type SystemData<'a> = (
+        Entities<'a>,
+        WriteExpect<'a, GroupManager>,
+        ReadExpect<'a, IdMaps>,
+        WriteStorage<'a, Group>,
+        ReadStorage<'a, Client>,
+        ReadStorage<'a, Uid>,
+        ReadStorage<'a, comp::Alignment>,
+        ReadStorage<'a, comp::MapMarker>,
+    );
+
+    fn handle(
+        events: impl ExactSizeIterator<Item = Self>,
+        (entities, mut group_manager, id_maps, mut groups, clients, uids, alignments, map_markers): Self::SystemData<'_>,
+    ) {
+        for GroupManipEvent(entity, manip) in events {
             match manip {
                 GroupManip::Leave => {
-            let state = server.state_mut();
-            let clients = state.ecs().read_storage::<Client>();
-            let uids = state.ecs().read_storage::<Uid>();
-            let mut group_manager = state.ecs().write_resource::<GroupManager>();
-            let map_markers = state.ecs().read_storage::<comp::MapMarker>();
                     group_manager.leave_group(
                         entity,
-                &mut state.ecs().write_storage(),
-                &state.ecs().read_storage(),
+                        &mut groups,
+                        &alignments,
                         &uids,
-                &state.ecs().entities(),
+                        &entities,
                         &mut |entity, group_change| {
                             clients
                                 .get(entity)
@@ -143,12 +149,7 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                     );
                 },
                 GroupManip::Kick(uid) => {
-            let state = server.state_mut();
-            let clients = state.ecs().read_storage::<Client>();
-            let uids = state.ecs().read_storage::<Uid>();
-            let alignments = state.ecs().read_storage::<comp::Alignment>();
-
-            let target = match state.ecs().entity_from_uid(uid) {
+                    let target = match id_maps.uid_entity(uid) {
                         Some(t) => t,
                         None => {
                             // Inform of failure
@@ -184,9 +185,6 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                         return;
                     }
 
-            let mut groups = state.ecs().write_storage::<Group>();
-            let mut group_manager = state.ecs().write_resource::<GroupManager>();
-            let map_markers = state.ecs().read_storage::<comp::MapMarker>();
                     // Make sure kicker is the group leader
                     match groups
                         .get(target)
@@ -197,9 +195,9 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                             group_manager.leave_group(
                                 target,
                                 &mut groups,
-                        &state.ecs().read_storage(),
+                                &alignments,
                                 &uids,
-                        &state.ecs().entities(),
+                                &entities,
                                 &mut |entity, group_change| {
                                     clients
                                         .get(entity)
@@ -209,7 +207,12 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                                                 .map(|g| (g, c))
                                         })
                                         .map(|(g, c)| {
-                                    update_map_markers(&map_markers, &uids, c, &group_change);
+                                            update_map_markers(
+                                                &map_markers,
+                                                &uids,
+                                                c,
+                                                &group_change,
+                                            );
                                             c.send_fallible(ServerGeneral::GroupUpdate(g));
                                         });
                                 },
@@ -251,10 +254,7 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                     }
                 },
                 GroupManip::AssignLeader(uid) => {
-            let state = server.state_mut();
-            let clients = state.ecs().read_storage::<Client>();
-            let uids = state.ecs().read_storage::<Uid>();
-            let target = match state.ecs().entity_from_uid(uid) {
+                    let target = match id_maps.uid_entity(uid) {
                         Some(t) => t,
                         None => {
                             // Inform of failure
@@ -267,9 +267,6 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                             return;
                         },
                     };
-            let groups = state.ecs().read_storage::<Group>();
-            let mut group_manager = state.ecs().write_resource::<GroupManager>();
-            let map_markers = state.ecs().read_storage::<comp::MapMarker>();
                     // Make sure assigner is the group leader
                     match groups
                         .get(target)
@@ -280,8 +277,8 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                             group_manager.assign_leader(
                                 target,
                                 &groups,
-                        &state.ecs().entities(),
-                        &state.ecs().read_storage(),
+                                &entities,
+                                &alignments,
                                 &uids,
                                 |entity, group_change| {
                                     clients
@@ -292,7 +289,12 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                                                 .map(|g| (g, c))
                                         })
                                         .map(|(g, c)| {
-                                    update_map_markers(&map_markers, &uids, c, &group_change);
+                                            update_map_markers(
+                                                &map_markers,
+                                                &uids,
+                                                c,
+                                                &group_change,
+                                            );
                                             c.send_fallible(ServerGeneral::GroupUpdate(g));
                                         });
                                 },
@@ -317,7 +319,8 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                             if let Some(client) = clients.get(entity) {
                                 client.send_fallible(ServerGeneral::server_msg(
                                     ChatType::Meta,
-                            "Transfer failed: You are not the leader of the target's group.",
+                                    "Transfer failed: You are not the leader of the target's \
+                                     group.",
                                 ));
                             }
                         },
@@ -334,3 +337,5 @@ pub fn handle_group(server: &mut Server, entity: Entity, manip: GroupManip) {
                 },
             }
         }
+    }
+}

server/src/events/information.rs

@@ -1,12 +1,21 @@
-use crate::{client::Client, Server};
+use crate::client::Client;
+use common::event::RequestSiteInfoEvent;
 use common_net::msg::{world_msg::EconomyInfo, ServerGeneral};
-use specs::{Entity as EcsEntity, WorldExt};
+use specs::{ReadExpect, ReadStorage};
 use std::collections::HashMap;
+use world::IndexOwned;
+
+use super::ServerEvent;
 
 #[cfg(not(feature = "worldgen"))]
-pub fn handle_site_info(server: &Server, entity: EcsEntity, id: u64) {
+impl ServerEvent for RequestSiteInfoEvent {
+    type SystemData<'a> = ReadStorage<'a, Client>;
+
+    fn handle(events: impl ExactSizeIterator<Item = Self>, clients: Self::SystemData<'_>) {
+        for ev in events {
+            if let Some(client) = clients.get(ev.entity) {
                 let info = EconomyInfo {
-        id,
+                    id: ev.id,
                     population: 0,
                     stock: HashMap::new(),
                     labor_values: HashMap::new(),
@@ -16,23 +25,26 @@ pub fn handle_site_info(server: &Server, entity: EcsEntity, id: u64) {
                     resources: HashMap::new(),
                 };
                 let msg = ServerGeneral::SiteEconomy(info);
-    server
-        .state
-        .ecs()
-        .read_storage::<Client>()
-        .get(entity)
-        .map(|c| c.send(msg));
+                client.send_fallible(msg);
+            }
+        }
+    }
 }
 
 #[cfg(feature = "worldgen")]
-pub fn handle_site_info(server: &Server, entity: EcsEntity, id: u64) {
-    let site_id = server.index.sites.recreate_id(id);
+impl ServerEvent for RequestSiteInfoEvent {
+    type SystemData<'a> = (ReadExpect<'a, IndexOwned>, ReadStorage<'a, Client>);
+
+    fn handle(events: impl ExactSizeIterator<Item = Self>, (index, clients): Self::SystemData<'_>) {
+        for ev in events {
+            if let Some(client) = clients.get(ev.entity) {
+                let site_id = index.sites.recreate_id(ev.id);
                 let info = if let Some(site_id) = site_id {
-        let site = server.index.sites.get(site_id);
+                    let site = index.sites.get(site_id);
                     site.economy.get_information(site_id)
                 } else {
                     EconomyInfo {
-            id,
+                        id: ev.id,
                         population: 0,
                         stock: HashMap::new(),
                         labor_values: HashMap::new(),
@@ -43,10 +55,8 @@ pub fn handle_site_info(server: &Server, entity: EcsEntity, id: u64) {
                     }
                 };
                 let msg = ServerGeneral::SiteEconomy(info);
-    server
-        .state
-        .ecs()
-        .read_storage::<Client>()
-        .get(entity)
-        .map(|c| c.send(msg));
+                client.send_fallible(msg);
+            }
+        }
+    }
 }

server/src/events/interaction.rs

@@ -1,64 +1,74 @@
-use specs::{world::WorldExt, Entity as EcsEntity, Join};
+use common_state::{BlockChange, ScheduledBlockChange};
+use specs::{DispatcherBuilder, Join, ReadExpect, ReadStorage, WriteExpect, WriteStorage};
 use vek::*;
 
 use common::{
     assets::{self, Concatenate},
     comp::{
         self,
-        agent::{AgentEvent, Sound, SoundKind},
-        dialogue::Subject,
+        agent::{AgentEvent, SoundKind},
         inventory::slot::EquipSlot,
         item::{flatten_counted_items, MaterialStatManifest},
         loot_owner::LootOwnerKind,
-        pet::is_mountable,
-        tool::{AbilityMap, ToolKind},
-        Inventory, LootOwner, Pos, SkillGroupKind,
+        tool::AbilityMap,
     },
-    consts::{
-        MAX_INTERACT_RANGE, MAX_MOUNT_RANGE, MAX_NPCINTERACT_RANGE, MAX_SPRITE_MOUNT_RANGE,
-        SOUND_TRAVEL_DIST_PER_VOLUME,
+    consts::{MAX_INTERACT_RANGE, MAX_NPCINTERACT_RANGE, SOUND_TRAVEL_DIST_PER_VOLUME},
+    event::{
+        CreateItemDropEvent, CreateSpriteEvent, EventBus, MineBlockEvent, NpcInteractEvent,
+        SetLanternEvent, SetPetStayEvent, SoundEvent, TamePetEvent, ToggleSpriteLightEvent,
     },
-    event::EventBus,
     link::Is,
-    mounting::{Mount, Mounting, Rider, VolumeMounting, VolumePos, VolumeRider},
+    mounting::Mount,
     outcome::Outcome,
-    rtsim::RtSimEntity,
-    terrain::{Block, SpriteKind},
-    uid::{IdMaps, Uid},
+    terrain::{Block, SpriteKind, TerrainGrid},
+    uid::Uid,
+    util::Dir,
     vol::ReadVol,
 };
-use common_net::sync::WorldSyncExt;
 
-use crate::{rtsim::RtSim, state_ext::StateExt, Server, Time};
+use crate::{Server, Time};
 
 use crate::pet::tame_pet;
 use hashbrown::{HashMap, HashSet};
 use lazy_static::lazy_static;
 use serde::Deserialize;
-use std::{iter::FromIterator, sync::Arc};
+use std::iter::FromIterator;
 
-pub fn handle_lantern(server: &mut Server, entity: EcsEntity, enable: bool) {
-    let ecs = server.state_mut().ecs();
+use super::{event_dispatch, mounting::within_mounting_range, ServerEvent};
 
-    let lantern_exists = ecs
-        .read_storage::<comp::LightEmitter>()
+pub(super) fn register_event_systems(builder: &mut DispatcherBuilder) {
+    event_dispatch::<SetLanternEvent>(builder);
+    event_dispatch::<NpcInteractEvent>(builder);
+    event_dispatch::<SetPetStayEvent>(builder);
+    event_dispatch::<MineBlockEvent>(builder);
+    event_dispatch::<SoundEvent>(builder);
+    event_dispatch::<CreateSpriteEvent>(builder);
+    event_dispatch::<ToggleSpriteLightEvent>(builder);
+}
+
+impl ServerEvent for SetLanternEvent {
+    type SystemData<'a> = (
+        WriteStorage<'a, comp::LightEmitter>,
+        ReadStorage<'a, comp::Inventory>,
+        ReadStorage<'a, comp::Health>,
+    );
+
+    fn handle(
+        events: impl ExactSizeIterator<Item = Self>,
+        (mut light_emitters, inventories, healths): Self::SystemData<'_>,
+    ) {
+        for SetLanternEvent(entity, enable) in events {
+            let lantern_exists = light_emitters
                 .get(entity)
                 .map_or(false, |light| light.strength > 0.0);
 
             if lantern_exists != enable {
                 if !enable {
-            server
-                .state_mut()
-                .ecs()
-                .write_storage::<comp::LightEmitter>()
-                .remove(entity);
-        } else if ecs // Only enable lantern if entity is alive
-            .read_storage::<comp::Health>()
-            .get(entity)
-            .map_or(true, |h| !h.is_dead)
-        {
-            let inventory_storage = ecs.read_storage::<Inventory>();
-            let lantern_info = inventory_storage
+                    light_emitters.remove(entity);
+                }
+                // Only enable lantern if entity is alive
+                else if healths.get(entity).map_or(true, |h| !h.is_dead) {
+                    let lantern_info = inventories
                         .get(entity)
                         .and_then(|inventory| inventory.equipped(EquipSlot::Lantern))
                         .and_then(|item| {
@@ -69,192 +79,74 @@ pub fn handle_lantern(server: &mut Server, entity: EcsEntity, enable: bool) {
                             }
                         });
                     if let Some((col, strength, flicker)) = lantern_info {
-                let _ =
-                    ecs.write_storage::<comp::LightEmitter>()
-                        .insert(entity, comp::LightEmitter {
+                        let _ = light_emitters.insert(entity, comp::LightEmitter {
                             col,
                             strength,
                             flicker,
                             animated: true,
                         });
+
+                    }
+                }
             }
         }
     }
 }
 
-pub fn handle_npc_interaction(
-    server: &mut Server,
-    interactor: EcsEntity,
-    npc_entity: EcsEntity,
-    subject: Subject,
+impl ServerEvent for NpcInteractEvent {
+    type SystemData<'a> = (
+        WriteStorage<'a, comp::Agent>,
+        ReadStorage<'a, comp::Pos>,
+        ReadStorage<'a, Uid>,
+    );
+
+    fn handle(
+        events: impl ExactSizeIterator<Item = Self>,
+        (mut agents, positions, uids): Self::SystemData<'_>,
     ) {
-    let state = server.state_mut();
+        for NpcInteractEvent(interactor, npc_entity, subject) in events {
             let within_range = {
-        let positions = state.ecs().read_storage::<Pos>();
                 positions
                     .get(interactor)
                     .zip(positions.get(npc_entity))
                     .map_or(false, |(interactor_pos, npc_pos)| {
-                interactor_pos.0.distance_squared(npc_pos.0) <= MAX_NPCINTERACT_RANGE.powi(2)
+                        interactor_pos.0.distance_squared(npc_pos.0)
+                            <= MAX_NPCINTERACT_RANGE.powi(2)
                     })
             };
 
-    if within_range
-        && let Some(agent) = state
-            .ecs()
-            .write_storage::<comp::Agent>()
-            .get_mut(npc_entity)
-        && agent.target.is_none()
+            if within_range && let Some(agent) = agents
+                .get_mut(npc_entity) && agent.target.is_none()
             {
-        if let Some(interactor_uid) = state.ecs().uid_from_entity(interactor) {
+                if let Some(interactor_uid) = uids.get(interactor) {
                     agent
                         .inbox
-                .push_back(AgentEvent::Talk(interactor_uid, subject));
+                        .push_back(AgentEvent::Talk(*interactor_uid, subject));
                 }
             }
         }
-
-pub fn handle_mount(server: &mut Server, rider: EcsEntity, mount: EcsEntity) {
-    let state = server.state_mut();
-
-    let within_range = {
-        let positions = state.ecs().read_storage::<Pos>();
-        within_mounting_range(positions.get(rider), positions.get(mount))
-    };
-
-    if within_range {
-        let uids = state.ecs().read_storage::<Uid>();
-        if let (Some(rider_uid), Some(mount_uid)) =
-            (uids.get(rider).copied(), uids.get(mount).copied())
-        {
-            let is_pet_of = |mount, rider_uid| {
-                matches!(
-                    state
-                        .ecs()
-                        .read_storage::<comp::Alignment>()
-                        .get(mount),
-                    Some(comp::Alignment::Owned(owner)) if *owner == rider_uid,
-                )
-            };
-
-            let can_ride = state
-                .ecs()
-                .read_storage()
-                .get(mount)
-                .map_or(false, |mount_body| {
-                    is_mountable(mount_body, state.ecs().read_storage().get(rider))
-                });
-
-            let is_stay = state
-                .ecs()
-                .read_storage::<comp::Agent>()
-                .get(mount)
-                .and_then(|x| x.stay_pos)
-                .is_some();
-
-            if (is_pet_of(mount, rider_uid) || is_pet_of(rider, mount_uid)) && can_ride && !is_stay
-            {
-                drop(uids);
-                let _ = state.link(Mounting {
-                    mount: mount_uid,
-                    rider: rider_uid,
-                });
-            }
-        }
     }
 }
 
-pub fn handle_mount_volume(server: &mut Server, rider: EcsEntity, volume_pos: VolumePos) {
-    let state = server.state_mut();
-
-    let block_transform = volume_pos.get_block_and_transform(
-        &state.terrain(),
-        &state.ecs().read_resource(),
-        |e| {
-            state
-                .read_storage()
-                .get(e)
-                .copied()
-                .zip(state.read_storage().get(e).copied())
-        },
-        &state.read_storage(),
+impl ServerEvent for SetPetStayEvent {
+    type SystemData<'a> = (
+        WriteStorage<'a, comp::Agent>,
+        WriteStorage<'a, comp::CharacterActivity>,
+        ReadStorage<'a, comp::Pos>,
+        ReadStorage<'a, comp::Alignment>,
+        ReadStorage<'a, Is<Mount>>,
+        ReadStorage<'a, Uid>,
     );
 
-    if let Some((mat, _, block)) = block_transform
-        && let Some(mount_offset) = block.mount_offset()
-    {
-        let mount_pos = (mat * mount_offset.0.with_w(1.0)).xyz();
-        let within_range = {
-            let positions = state.ecs().read_storage::<Pos>();
-            positions.get(rider).map_or(false, |pos| {
-                pos.0.distance_squared(mount_pos) < MAX_SPRITE_MOUNT_RANGE.powi(2)
-            })
-        };
-
-        let maybe_uid = state.ecs().read_storage::<Uid>().get(rider).copied();
-
-        if let Some(rider) = maybe_uid
-            && within_range
-        {
-            let _link_successful = state
-                .link(VolumeMounting {
-                    pos: volume_pos,
-                    block,
-                    rider,
-                })
-                .is_ok();
-            #[cfg(feature = "worldgen")]
-            if _link_successful {
-                let uid_allocator = state.ecs().read_resource::<IdMaps>();
-                if let Some(rider_entity) = uid_allocator.uid_entity(rider)
-                    && let Some(rider_actor) = state.entity_as_actor(rider_entity)
-                    && let Some(volume_pos) = volume_pos.try_map_entity(|uid| {
-                        let entity = uid_allocator.uid_entity(uid)?;
-                        state.read_storage::<RtSimEntity>().get(entity).map(|v| v.0)
-                    })
-                {
-                    state
-                        .ecs()
-                        .write_resource::<RtSim>()
-                        .hook_character_mount_volume(
-                            &state.ecs().read_resource::<Arc<world::World>>(),
-                            state
-                                .ecs()
-                                .read_resource::<world::IndexOwned>()
-                                .as_index_ref(),
-                            volume_pos,
-                            rider_actor,
-                        );
-                }
-            }
-        }
-    }
-}
-
-pub fn handle_unmount(server: &mut Server, rider: EcsEntity) {
-    let state = server.state_mut();
-    state.ecs().write_storage::<Is<Rider>>().remove(rider);
-    state.ecs().write_storage::<Is<VolumeRider>>().remove(rider);
-}
-
-pub fn handle_set_pet_stay(
-    server: &mut Server,
-    command_giver: EcsEntity,
-    pet: EcsEntity,
-    stay: bool,
+    fn handle(
+        events: impl ExactSizeIterator<Item = Self>,
+        (mut agents, mut character_activities, positions, alignments, is_mounts, uids): Self::SystemData<'_>,
     ) {
-    let state = server.state_mut();
-    let positions = state.ecs().read_storage::<Pos>();
-    let is_owner = state
-        .ecs()
-        .uid_from_entity(command_giver)
-        .map_or(false, |owner_uid| {
+        for SetPetStayEvent(command_giver, pet, stay) in events {
+            let is_owner = uids.get(command_giver).map_or(false, |owner_uid| {
                 matches!(
-                state
-                    .ecs()
-                    .read_storage::<comp::Alignment>()
-                    .get(pet),
-                Some(comp::Alignment::Owned(pet_owner)) if *pet_owner == owner_uid,
+                    alignments.get(pet),
+                    Some(comp::Alignment::Owned(pet_owner)) if *pet_owner == *owner_uid,
                 )
             });
 
@@ -262,25 +154,16 @@ pub fn handle_set_pet_stay(
             let stay = stay && current_pet_position.is_some();
             if is_owner
                 && within_mounting_range(positions.get(command_giver), positions.get(pet))
-        && state.ecs().read_storage::<Is<Mount>>().get(pet).is_none()
+                && is_mounts.get(pet).is_none()
             {
-        state
-            .ecs()
-            .write_storage::<comp::CharacterActivity>()
+                character_activities
                     .get_mut(pet)
                     .map(|mut activity| activity.is_pet_staying = stay);
-        state
-            .ecs()
-            .write_storage::<comp::Agent>()
+                agents
                     .get_mut(pet)
                     .map(|s| s.stay_pos = current_pet_position.filter(|_| stay));
             }
         }
-
-fn within_mounting_range(player_position: Option<&Pos>, mount_position: Option<&Pos>) -> bool {
-    match (player_position, mount_position) {
-        (Some(ppos), Some(ipos)) => ppos.0.distance_squared(ipos.0) < MAX_MOUNT_RANGE.powi(2),
-        _ => false,
     }
 }
 
@@ -303,30 +186,50 @@ lazy_static! {
         );
 }
 
-pub fn handle_mine_block(
-    server: &mut Server,
-    entity: EcsEntity,
-    pos: Vec3<i32>,
-    tool: Option<ToolKind>,
+impl ServerEvent for MineBlockEvent {
+    type SystemData<'a> = (
+        WriteExpect<'a, BlockChange>,
+        ReadExpect<'a, TerrainGrid>,
+        ReadExpect<'a, MaterialStatManifest>,
+        ReadExpect<'a, AbilityMap>,
+        ReadExpect<'a, EventBus<CreateItemDropEvent>>,
+        ReadExpect<'a, EventBus<Outcome>>,
+        WriteStorage<'a, comp::SkillSet>,
+        ReadStorage<'a, Uid>,
+    );
+
+    fn handle(
+        events: impl ExactSizeIterator<Item = Self>,
+        (
+            mut block_change,
+            terrain,
+            msm,
+            ability_map,
+            create_item_drop_events,
+            outcomes,
+            mut skill_sets,
+            uids,
+        ): Self::SystemData<'_>,
     ) {
-    let state = server.state_mut();
-    if state.can_set_block(pos) {
-        let block = state.terrain().get(pos).ok().copied();
-        if let Some(block) = block.filter(|b| b.mine_tool().map_or(false, |t| Some(t) == tool)) {
+        use rand::Rng;
+        let mut rng = rand::thread_rng();
+        let mut create_item_drop_emitter = create_item_drop_events.emitter();
+        let mut outcome_emitter = outcomes.emitter();
+        for ev in events {
+            if block_change.can_set_block(ev.pos) {
+                let block = terrain.get(ev.pos).ok().copied();
+                if let Some(block) =
+                    block.filter(|b| b.mine_tool().map_or(false, |t| Some(t) == ev.tool))
+                {
                     // Drop item if one is recoverable from the block
                     if let Some(items) = comp::Item::try_reclaim_from_block(block) {
-                let msm = &MaterialStatManifest::load().read();
-                let ability_map = &AbilityMap::load().read();
-                let mut items: Vec<_> = flatten_counted_items(&items, ability_map, msm).collect();
-                let maybe_uid = state.ecs().uid_from_entity(entity);
+                        let mut items: Vec<_> =
+                            flatten_counted_items(&items, &ability_map, &msm).collect();
+                        let maybe_uid = uids.get(ev.entity).copied();
 
-                if let Some(mut skillset) = state
-                    .ecs()
-                    .write_storage::<comp::SkillSet>()
-                    .get_mut(entity)
-                {
+                        if let Some(mut skillset) = skill_sets.get_mut(ev.entity) {
                             if let (Some(tool), Some(uid), exp_reward @ 1..) = (
-                        tool,
+                                ev.tool,
                                 maybe_uid,
                                 items
                                     .iter()
@@ -337,26 +240,23 @@ pub fn handle_mine_block(
                                     })
                                     .sum(),
                             ) {
-                        let skill_group = SkillGroupKind::Weapon(tool);
-                        let outcome_bus = state.ecs().read_resource::<EventBus<Outcome>>();
+                                let skill_group = comp::SkillGroupKind::Weapon(tool);
                                 if let Some(level_outcome) =
                                     skillset.add_experience(skill_group, exp_reward)
                                 {
-                            outcome_bus.emit_now(Outcome::SkillPointGain {
+                                    outcome_emitter.emit(Outcome::SkillPointGain {
                                         uid,
                                         skill_tree: skill_group,
                                         total_points: level_outcome,
                                     });
                                 }
-                        outcome_bus.emit_now(Outcome::ExpChange {
+                                outcome_emitter.emit(Outcome::ExpChange {
                                     uid,
                                     exp: exp_reward,
                                     xp_pools: HashSet::from_iter(vec![skill_group]),
                                 });
                             }
                             use common::comp::skills::{MiningSkill, Skill, SKILL_MODIFIERS};
-                    use rand::Rng;
-                    let mut rng = rand::thread_rng();
 
                             let need_double_ore = |rng: &mut rand::rngs::ThreadRng| {
                                 let chance_mod = f64::from(SKILL_MODIFIERS.mining_tree.ore_gain);
@@ -378,7 +278,8 @@ pub fn handle_mine_block(
                                 let double_gain =
                                     item.item_definition_id().itemdef_id().map_or(false, |id| {
                                         (id.contains("mineral.ore.") && need_double_ore(&mut rng))
-                                    || (id.contains("mineral.gem.") && need_double_gem(&mut rng))
+                                            || (id.contains("mineral.gem.")
+                                                && need_double_gem(&mut rng))
                                     });
 
                                 if double_gain {
@@ -390,36 +291,44 @@ pub fn handle_mine_block(
                         for item in items {
                             let loot_owner = maybe_uid
                                 .map(LootOwnerKind::Player)
-                        .map(|owner| LootOwner::new(owner, false));
-                    state.create_item_drop(
-                        Pos(pos.map(|e| e as f32) + Vec3::new(0.5, 0.5, 0.0)),
-                        comp::Vel(Vec3::zero()),
+                                .map(|owner| comp::LootOwner::new(owner, false));
+                            create_item_drop_emitter.emit(CreateItemDropEvent {
+                                pos: comp::Pos(ev.pos.map(|e| e as f32) + Vec3::new(0.5, 0.5, 0.0)),
+                                vel: comp::Vel(Vec3::zero()),
+                                ori: comp::Ori::from(Dir::random_2d(&mut rng)),
                                 item,
                                 loot_owner,
-                    );
+                            });
                         }
                     }
 
-            state.set_block(pos, block.into_vacant());
-            state
-                .ecs()
-                .read_resource::<EventBus<Outcome>>()
-                .emit_now(Outcome::BreakBlock {
-                    pos,
+                    block_change.set(ev.pos, block.into_vacant());
+                    outcome_emitter.emit(Outcome::BreakBlock {
+                        pos: ev.pos,
                         color: block.get_color(),
                     });
                 }
             }
         }
+    }
+}
 
-pub fn handle_sound(server: &mut Server, sound: &Sound) {
-    let ecs = &server.state.ecs();
-    let positions = &ecs.read_storage::<Pos>();
-    let agents = &mut ecs.write_storage::<comp::Agent>();
+impl ServerEvent for SoundEvent {
+    type SystemData<'a> = (
+        ReadExpect<'a, EventBus<Outcome>>,
+        WriteStorage<'a, comp::Agent>,
+        ReadStorage<'a, comp::Pos>,
+    );
 
+    fn handle(
+        events: impl ExactSizeIterator<Item = Self>,
+        (outcomes, mut agents, positions): Self::SystemData<'_>,
+    ) {
+        let mut outcome_emitter = outcomes.emitter();
+        for SoundEvent { sound } in events {
             // TODO: Reduce the complexity of this problem by using spatial partitioning
             // system
-    for (agent, agent_pos) in (agents, positions).join() {
+            for (agent, agent_pos) in (&mut agents, &positions).join() {
                 // TODO: Use pathfinding for more dropoff around obstacles
                 let agent_dist_sqrd = agent_pos.0.distance_squared(sound.pos);
                 let sound_travel_dist_sqrd = (sound.vol * SOUND_TRAVEL_DIST_PER_VOLUME).powi(2);
@@ -446,66 +355,75 @@ pub fn handle_sound(server: &mut Server, sound: &Sound) {
                 }),
                 _ => None,
             } {
-        ecs.read_resource::<EventBus<Outcome>>().emit_now(outcome);
+                outcome_emitter.emit(outcome);
+            }
+        }
     }
 }
 
-pub fn handle_create_sprite(
-    server: &mut Server,
-    pos: Vec3<i32>,
-    sprite: SpriteKind,
-    del_timeout: Option<(f32, f32)>,
+impl ServerEvent for CreateSpriteEvent {
+    type SystemData<'a> = (
+        WriteExpect<'a, BlockChange>,
+        WriteExpect<'a, ScheduledBlockChange>,
+        ReadExpect<'a, TerrainGrid>,
+        ReadExpect<'a, Time>,
+    );
+
+    fn handle(
+        events: impl ExactSizeIterator<Item = Self>,
+        (mut block_change, mut scheduled_block_change, terrain, time): Self::SystemData<'_>,
     ) {
-    let state = server.state_mut();
-    if state.can_set_block(pos) {
-        let block = state.terrain().get(pos).ok().copied();
+        for ev in events {
+            if block_change.can_set_block(ev.pos) {
+                let block = terrain.get(ev.pos).ok().copied();
                 if block.map_or(false, |b| (*b).is_fluid()) {
                     let old_block = block.unwrap_or_else(|| Block::air(SpriteKind::Empty));
-            let new_block = old_block.with_sprite(sprite);
-            state.set_block(pos, new_block);
+                    let new_block = old_block.with_sprite(ev.sprite);
+                    block_change.set(ev.pos, new_block);
                     // Remove sprite after del_timeout and offset if specified
-            if let Some((timeout, del_offset)) = del_timeout {
+                    if let Some((timeout, del_offset)) = ev.del_timeout {
                         use rand::Rng;
                         let mut rng = rand::thread_rng();
                         let offset = rng.gen_range(0.0..del_offset);
-                let current_time: f64 = state.ecs().read_resource::<Time>().0;
+                        let current_time: f64 = time.0;
                         let replace_time = current_time + (timeout + offset) as f64;
                         if old_block != new_block {
-                    server
-                        .state
-                        .schedule_set_block(pos, old_block, new_block, replace_time)
+                            scheduled_block_change.set(ev.pos, old_block, replace_time);
+                            scheduled_block_change.outcome_set(ev.pos, new_block, replace_time);
+                        }
+                    }
                 }
             }
         }
     }
 }
 
-pub fn handle_tame_pet(server: &mut Server, pet_entity: EcsEntity, owner_entity: EcsEntity) {
-    // TODO: Raise outcome to send to clients to play sound/render an indicator
-    // showing taming success?
-    tame_pet(server.state.ecs(), pet_entity, owner_entity);
-}
+impl ServerEvent for ToggleSpriteLightEvent {
+    type SystemData<'a> = (
+        WriteExpect<'a, BlockChange>,
+        ReadExpect<'a, TerrainGrid>,
+        ReadStorage<'a, comp::Pos>,
+    );
 
-pub fn handle_toggle_sprite_light(
-    server: &mut Server,
-    entity: EcsEntity,
-    pos: Vec3<i32>,
-    enable: bool,
+    fn handle(
+        events: impl ExactSizeIterator<Item = Self>,
+        (mut block_change, terrain, positions): Self::SystemData<'_>,
     ) {
-    let state = server.state_mut();
-    // TODO: Implement toggling lights on volume entities
-    if let Some(entity_pos) = state.ecs().read_storage::<Pos>().get(entity)
-        && entity_pos.0.distance_squared(pos.as_()) < MAX_INTERACT_RANGE.powi(2)
-        && state.can_set_block(pos)
-    {
-        if let Some(new_block) = state
-            .terrain()
-            .get(pos)
-            .ok()
-            .and_then(|block| block.with_toggle_light(enable))
-        {
-            state.set_block(pos, new_block);
+        for ev in events.into_iter() {
+            if let Some(entity_pos) = positions.get(ev.entity)
+            && entity_pos.0.distance_squared(ev.pos.as_()) < MAX_INTERACT_RANGE.powi(2)
+            && block_change.can_set_block(ev.pos) {
+                if let Some(new_block) = terrain.get(ev.pos).ok().and_then(|block| block.with_toggle_light(ev.enable)) {
+                    block_change.set(ev.pos, new_block);
                     // TODO: Emit outcome
                 }
             }
         }
+    }
+}
+
+pub fn handle_tame_pet(server: &mut Server, ev: TamePetEvent) {
+    // TODO: Raise outcome to send to clients to play sound/render an indicator
+    // showing taming success?
+    tame_pet(server.state.ecs(), ev.pet_entity, ev.owner_entity);
+}

server/src/events/invite.rs

@@ -1,23 +1,27 @@
-use super::group_manip::{self, update_map_markers};
-use crate::{client::Client, Server};
+use super::{
+    event_dispatch,
+    group_manip::{self, update_map_markers},
+    ServerEvent,
+};
+use crate::{client::Client, Settings};
 use common::{
     comp::{
         self,
         agent::{Agent, AgentEvent},
         group::GroupManager,
         invite::{Invite, InviteKind, InviteResponse, PendingInvites},
-        ChatType, Pos,
+        ChatType, Group, Pos,
     },
     consts::MAX_TRADE_RANGE,
+    event::{InitiateInviteEvent, InviteResponseEvent},
     trade::{TradeResult, Trades},
-    uid::Uid,
+    uid::{IdMaps, Uid},
 };
-use common_net::{
-    msg::{InviteAnswer, ServerGeneral},
-    sync::WorldSyncExt,
+use common_net::msg::{InviteAnswer, ServerGeneral};
+use specs::{
+    shred, DispatcherBuilder, Entities, Entity, ReadExpect, ReadStorage, SystemData, WriteExpect,
+    WriteStorage,
 };
-use common_state::State;
-use specs::{world::WorldExt, Entity};
 use std::time::{Duration, Instant};
 use tracing::{error, warn};
 
@@ -26,11 +30,45 @@ const INVITE_TIMEOUT_DUR: Duration = Duration::from_secs(31);
 /// Reduced duration shown to the client to help alleviate latency issues
 const PRESENTED_INVITE_TIMEOUT_DUR: Duration = Duration::from_secs(30);
 
-pub fn handle_invite(server: &mut Server, inviter: Entity, invitee_uid: Uid, kind: InviteKind) {
-    let max_group_size = server.settings().max_player_group_size;
-    let state = server.state_mut();
-    let clients = state.ecs().read_storage::<Client>();
-    let invitee = match state.ecs().entity_from_uid(invitee_uid) {
+pub(super) fn register_event_systems(builder: &mut DispatcherBuilder) {
+    event_dispatch::<InitiateInviteEvent>(builder);
+    event_dispatch::<InviteResponseEvent>(builder);
+}
+
+impl ServerEvent for InitiateInviteEvent {
+    type SystemData<'a> = (
+        WriteExpect<'a, Trades>,
+        ReadExpect<'a, Settings>,
+        ReadExpect<'a, IdMaps>,
+        ReadExpect<'a, GroupManager>,
+        WriteStorage<'a, PendingInvites>,
+        WriteStorage<'a, Agent>,
+        WriteStorage<'a, Invite>,
+        ReadStorage<'a, Uid>,
+        ReadStorage<'a, Client>,
+        ReadStorage<'a, Pos>,
+        ReadStorage<'a, Group>,
+    );
+
+    fn handle(
+        events: impl ExactSizeIterator<Item = Self>,
+        (
+            mut trades,
+            settings,
+            id_maps,
+            group_manager,
+            mut pending_invites,
+            mut agents,
+            mut invites,
+            uids,
+            clients,
+            positions,
+            groups,
+        ): Self::SystemData<'_>,
+    ) {
+        for InitiateInviteEvent(inviter, invitee_uid, kind) in events {
+            let max_group_size = settings.max_player_group_size;
+            let invitee = match id_maps.uid_entity(invitee_uid) {
                 Some(t) => t,
                 None => {
                     // Inform of failure
@@ -44,8 +82,6 @@ pub fn handle_invite(server: &mut Server, inviter: Entity, invitee_uid: Uid, kin
                 },
             };
 
-    let uids = state.ecs().read_storage::<Uid>();
-
             // Check if entity is trying to invite themselves
             if uids
                 .get(inviter)
@@ -55,13 +91,8 @@ pub fn handle_invite(server: &mut Server, inviter: Entity, invitee_uid: Uid, kin
                 return;
             }
 
-    let mut pending_invites = state.ecs().write_storage::<PendingInvites>();
-    let mut agents = state.ecs().write_storage::<Agent>();
-    let mut invites = state.ecs().write_storage::<Invite>();
-
-    if let InviteKind::Trade = kind {
+            if matches!(kind, InviteKind::Trade) {
                 // Check whether the inviter is in range of the invitee
-        let positions = state.ecs().read_storage::<Pos>();
                 if !within_trading_range(positions.get(inviter), positions.get(invitee)) {
                     return;
                 }
@@ -69,8 +100,9 @@ pub fn handle_invite(server: &mut Server, inviter: Entity, invitee_uid: Uid, kin
 
             if let InviteKind::Group = kind {
                 if !group_manip::can_invite(
-            state,
                     &clients,
+                    &groups,
+                    &group_manager,
                     &mut pending_invites,
                     max_group_size,
                     inviter,
@@ -80,21 +112,21 @@ pub fn handle_invite(server: &mut Server, inviter: Entity, invitee_uid: Uid, kin
                 }
             } else {
                 // cancel current trades for inviter before inviting someone else to trade
-        let mut trades = state.ecs().write_resource::<Trades>();
                 if let Some(inviter_uid) = uids.get(inviter).copied() {
                     if let Some(active_trade) = trades.entity_trades.get(&inviter_uid).copied() {
                         trades
                             .decline_trade(active_trade, inviter_uid)
-                    .and_then(|u| state.ecs().entity_from_uid(u))
+                            .and_then(|u| id_maps.uid_entity(u))
                             .map(|e| {
                                 if let Some(client) = clients.get(e) {
-                            client
-                                .send_fallible(ServerGeneral::FinishedTrade(TradeResult::Declined));
+                                    client.send_fallible(ServerGeneral::FinishedTrade(
+                                        TradeResult::Declined,
+                                    ));
                                 }
                                 if let Some(agent) = agents.get_mut(e) {
-                            agent
-                                .inbox
-                                .push_back(AgentEvent::FinishedTrade(TradeResult::Declined));
+                                    agent.inbox.push_back(AgentEvent::FinishedTrade(
+                                        TradeResult::Declined,
+                                    ));
                                 }
                             });
                     }
@@ -146,7 +178,9 @@ pub fn handle_invite(server: &mut Server, inviter: Entity, invitee_uid: Uid, kin
             };
 
             // If client comp
-    if let (Some(client), Some(inviter)) = (clients.get(invitee), uids.get(inviter).copied()) {
+            if let (Some(client), Some(inviter)) =
+                (clients.get(invitee), uids.get(inviter).copied())
+            {
                 if send_invite() {
                     client.send_fallible(ServerGeneral::Invite {
                         inviter,
@@ -175,57 +209,87 @@ pub fn handle_invite(server: &mut Server, inviter: Entity, invitee_uid: Uid, kin
                 }
             }
         }
-pub fn handle_invite_response(server: &mut Server, entity: Entity, response: InviteResponse) {
-    match response {
-        InviteResponse::Accept => handle_invite_accept(server, entity),
-        InviteResponse::Decline => handle_invite_decline(server, entity),
     }
 }
 
-pub fn handle_invite_accept(server: &mut Server, entity: Entity) {
-    let index = server.index.clone();
-    let state = server.state_mut();
-    if let Some((inviter, kind)) = get_inviter_and_kind(entity, state) {
-        handle_invite_answer(state, inviter, entity, InviteAnswer::Accepted, kind);
-        let clients = state.ecs().read_storage::<Client>();
-        let uids = state.ecs().read_storage::<Uid>();
-        let mut agents = state.ecs().write_storage::<Agent>();
+#[derive(SystemData)]
+pub struct InviteResponseData<'a> {
+    entities: Entities<'a>,
+    group_manager: WriteExpect<'a, GroupManager>,
+    trades: WriteExpect<'a, Trades>,
+    index: ReadExpect<'a, world::IndexOwned>,
+    id_maps: ReadExpect<'a, IdMaps>,
+    invites: WriteStorage<'a, Invite>,
+    pending_invites: WriteStorage<'a, PendingInvites>,
+    groups: WriteStorage<'a, Group>,
+    agents: WriteStorage<'a, comp::Agent>,
+    uids: ReadStorage<'a, Uid>,
+    clients: ReadStorage<'a, Client>,
+    alignments: ReadStorage<'a, comp::Alignment>,
+    map_markers: ReadStorage<'a, comp::MapMarker>,
+}
+
+impl ServerEvent for InviteResponseEvent {
+    type SystemData<'a> = InviteResponseData<'a>;
+
+    fn handle(events: impl ExactSizeIterator<Item = Self>, mut data: Self::SystemData<'_>) {
+        for InviteResponseEvent(entity, response) in events {
+            match response {
+                InviteResponse::Accept => handle_invite_accept(&mut data, entity),
+                InviteResponse::Decline => handle_invite_decline(&mut data, entity),
+            }
+        }
+    }
+}
+
+pub fn handle_invite_accept(data: &mut InviteResponseData, entity: Entity) {
+    if let Some((inviter, kind)) = get_inviter_and_kind(entity, data) {
+        handle_invite_answer(data, inviter, entity, InviteAnswer::Accepted, kind);
 
         match kind {
             InviteKind::Group => {
-                let map_markers = state.ecs().read_storage::<comp::MapMarker>();
-                let mut group_manager = state.ecs().write_resource::<GroupManager>();
-                group_manager.add_group_member(
+                data.group_manager.add_group_member(
                     inviter,
                     entity,
-                    &state.ecs().entities(),
-                    &mut state.ecs().write_storage(),
-                    &state.ecs().read_storage(),
-                    &uids,
+                    &data.entities,
+                    &mut data.groups,
+                    &data.alignments,
+                    &data.uids,
                     |entity, group_change| {
-                        clients
+                        data.clients
                             .get(entity)
                             .and_then(|c| {
                                 group_change
-                                    .try_map_ref(|e| uids.get(*e).copied())
+                                    .try_map_ref(|e| data.uids.get(*e).copied())
                                     .map(|g| (g, c))
                             })
                             .map(|(g, c)| {
-                                update_map_markers(&map_markers, &uids, c, &group_change);
+                                update_map_markers(&data.map_markers, &data.uids, c, &group_change);
                                 c.send_fallible(ServerGeneral::GroupUpdate(g));
                             });
                     },
                 );
             },
             InviteKind::Trade => {
-                if let (Some(inviter_uid), Some(invitee_uid)) =
-                    (uids.get(inviter).copied(), uids.get(entity).copied())
-                {
-                    let mut trades = state.ecs().write_resource::<Trades>();
+                if let (Some(inviter_uid), Some(invitee_uid)) = (
+                    data.uids.get(inviter).copied(),
+                    data.uids.get(entity).copied(),
+                ) {
                     // check if the person that invited me has started a new trade since the
                     // invitation was sent
-                    if trades.entity_trades.get(&inviter_uid).copied().is_some() {
-                        for client in clients.get(entity).into_iter().chain(clients.get(inviter)) {
+                    if data
+                        .trades
+                        .entity_trades
+                        .get(&inviter_uid)
+                        .copied()
+                        .is_some()
+                    {
+                        for client in data
+                            .clients
+                            .get(entity)
+                            .into_iter()
+                            .chain(data.clients.get(inviter))
+                        {
                             client.send_fallible(ServerGeneral::server_msg(
                                 ChatType::Meta,
                                 "Trade failed, inviter initiated new trade since sending trade \
@@ -234,39 +298,40 @@ pub fn handle_invite_accept(server: &mut Server, entity: Entity) {
                         }
                         return;
                     }
-                    let id = trades.begin_trade(inviter_uid, invitee_uid);
-                    let trade = trades.trades[&id].clone();
-                    if let Some(agent) = agents.get_mut(inviter) {
+                    let id = data.trades.begin_trade(inviter_uid, invitee_uid);
+                    let trade = data.trades.trades[&id].clone();
+                    if let Some(agent) = data.agents.get_mut(inviter) {
                         agent
                             .inbox
                             .push_back(AgentEvent::TradeAccepted(invitee_uid));
                     }
                     #[cfg(feature = "worldgen")]
-                    let pricing = agents
+                    let pricing = data
+                        .agents
                         .get(inviter)
                         .and_then(|a| {
                             a.behavior
                                 .trade_site()
-                                .and_then(|id| index.get_site_prices(id))
+                                .and_then(|id| data.index.get_site_prices(id))
                         })
                         .or_else(|| {
-                            agents.get(entity).and_then(|a| {
+                            data.agents.get(entity).and_then(|a| {
                                 a.behavior
                                     .trade_site()
-                                    .and_then(|id| index.get_site_prices(id))
+                                    .and_then(|id| data.index.get_site_prices(id))
                             })
                         });
                     #[cfg(not(feature = "worldgen"))]
                     let pricing = None;
 
-                    clients.get(inviter).map(|c| {
+                    data.clients.get(inviter).map(|c| {
                         c.send(ServerGeneral::UpdatePendingTrade(
                             id,
                             trade.clone(),
                             pricing.clone(),
                         ))
                     });
-                    clients
+                    data.clients
                         .get(entity)
                         .map(|c| c.send(ServerGeneral::UpdatePendingTrade(id, trade, pricing)));
                 }
@@ -275,18 +340,19 @@ pub fn handle_invite_accept(server: &mut Server, entity: Entity) {
     }
 }
 
-fn get_inviter_and_kind(entity: Entity, state: &mut State) -> Option<(Entity, InviteKind)> {
-    let mut invites = state.ecs().write_storage::<Invite>();
-    invites.remove(entity).and_then(|invite| {
+fn get_inviter_and_kind(
+    entity: Entity,
+    data: &mut InviteResponseData,
+) -> Option<(Entity, InviteKind)> {
+    data.invites.remove(entity).and_then(|invite| {
         let Invite { inviter, kind } = invite;
-        let mut pending_invites = state.ecs().write_storage::<PendingInvites>();
-        let pending = &mut pending_invites.get_mut(inviter)?.0;
+        let pending = &mut data.pending_invites.get_mut(inviter)?.0;
         // Check that inviter has a pending invite and remove it from the list
         let invite_index = pending.iter().position(|p| p.0 == entity)?;
         pending.swap_remove(invite_index);
         // If no pending invites remain remove the component
         if pending.is_empty() {
-            pending_invites.remove(inviter);
+            data.pending_invites.remove(inviter);
         }
 
         Some((inviter, kind))
@@ -294,28 +360,25 @@ fn get_inviter_and_kind(entity: Entity, state: &mut State) -> Option<(Entity, In
 }
 
 fn handle_invite_answer(
-    state: &mut State,
+    data: &mut InviteResponseData,
     inviter: Entity,
     entity: Entity,
     invite_answer: InviteAnswer,
     kind: InviteKind,
 ) {
-    let clients = state.ecs().read_storage::<Client>();
-    let uids = state.ecs().read_storage::<Uid>();
     if matches!(kind, InviteKind::Trade) && matches!(invite_answer, InviteAnswer::Accepted) {
         // invitee must close current trade if one exists before accepting new one
-        if let Some(invitee_uid) = uids.get(entity).copied() {
-            let mut trades = state.ecs().write_resource::<Trades>();
-            if let Some(active_trade) = trades.entity_trades.get(&invitee_uid).copied() {
-                trades
+        if let Some(invitee_uid) = data.uids.get(entity).copied() {
+            if let Some(active_trade) = data.trades.entity_trades.get(&invitee_uid).copied() {
+                data.trades
                     .decline_trade(active_trade, invitee_uid)
-                    .and_then(|u| state.ecs().entity_from_uid(u))
+                    .and_then(|u| data.id_maps.uid_entity(u))
                     .map(|e| {
-                        if let Some(client) = clients.get(e) {
+                        if let Some(client) = data.clients.get(e) {
                             client
                                 .send_fallible(ServerGeneral::FinishedTrade(TradeResult::Declined));
                         }
-                        if let Some(agent) = state.ecs().write_storage::<Agent>().get_mut(e) {
+                        if let Some(agent) = data.agents.get_mut(e) {
                             agent
                                 .inbox
                                 .push_back(AgentEvent::FinishedTrade(TradeResult::Declined));
@@ -324,7 +387,9 @@ fn handle_invite_answer(
             }
         };
     }
-    if let (Some(client), Some(target)) = (clients.get(inviter), uids.get(entity).copied()) {
+    if let (Some(client), Some(target)) =
+        (data.clients.get(inviter), data.uids.get(entity).copied())
+    {
         client.send_fallible(ServerGeneral::InviteComplete {
             target,
             answer: invite_answer,
@@ -333,11 +398,10 @@ fn handle_invite_answer(
     }
 }
 
-pub fn handle_invite_decline(server: &mut Server, entity: Entity) {
-    let state = server.state_mut();
-    if let Some((inviter, kind)) = get_inviter_and_kind(entity, state) {
+pub fn handle_invite_decline(data: &mut InviteResponseData, entity: Entity) {
+    if let Some((inviter, kind)) = get_inviter_and_kind(entity, data) {
         // Inform inviter of rejection
-        handle_invite_answer(state, inviter, entity, InviteAnswer::Declined, kind)
+        handle_invite_answer(data, inviter, entity, InviteAnswer::Declined, kind)
     }
 }
 

server/src/events/mod.rs

@@ -1,43 +1,31 @@
-use crate::{
-    events::{
-        entity_creation::handle_create_teleporter,
-        entity_manipulation::{handle_start_teleporting, handle_teleport_to_position},
-        interaction::{handle_mount_volume, handle_tame_pet},
-    },
-    persistence::PersistedComponents,
-    state_ext::StateExt,
-    Server,
-};
-use common::event::{EventBus, ServerEvent, ServerEventDiscriminants};
-use common_base::span;
-use entity_creation::{
-    handle_create_npc, handle_create_ship, handle_create_waypoint, handle_initialize_character,
-    handle_initialize_spectator, handle_loaded_character_data, handle_shockwave, handle_shoot,
-};
-use entity_manipulation::{
-    handle_aura, handle_bonk, handle_buff, handle_change_ability, handle_change_body,
-    handle_combo_change, handle_delete, handle_destroy, handle_energy_change,
-    handle_entity_attacked_hook, handle_explosion, handle_health_change, handle_knockback,
-    handle_land_on_ground, handle_make_admin, handle_parry_hook, handle_poise,
-    handle_remove_light_emitter, handle_respawn, handle_stance_change, handle_teleport_to,
-    handle_update_map_marker,
-};
-use group_manip::handle_group;
-use information::handle_site_info;
-use interaction::{
-    handle_create_sprite, handle_lantern, handle_mine_block, handle_mount, handle_npc_interaction,
-    handle_set_pet_stay, handle_sound, handle_toggle_sprite_light, handle_unmount,
-};
-use inventory_manip::handle_inventory;
-use invite::{handle_invite, handle_invite_response};
-use player::{handle_client_disconnect, handle_exit_ingame, handle_possess};
-use specs::{Builder, Entity as EcsEntity, WorldExt};
-use trade::handle_process_trade_action;
+use std::{marker::PhantomData, sync::Arc};
+
+use crate::{state_ext::StateExt, Server};
+use common::event::{
+    ChatEvent, ClientDisconnectEvent, ClientDisconnectWithoutPersistenceEvent, CommandEvent,
+    EventBus, ExitIngameEvent,
+};
+use common_base::span;
+use common_ecs::{dispatch, System};
+use specs::{DispatcherBuilder, Entity as EcsEntity, ReadExpect, WorldExt};
 
-use crate::events::player::handle_character_delete;
 pub use group_manip::update_map_markers;
 pub(crate) use trade::cancel_trades_for;
 
+use self::{
+    entity_creation::{
+        handle_create_npc, handle_create_ship, handle_create_teleporter, handle_create_waypoint,
+        handle_initialize_character, handle_initialize_spectator, handle_loaded_character_data,
+        handle_shockwave, handle_shoot,
+    },
+    interaction::handle_tame_pet,
+    mounting::{handle_mount, handle_mount_volume, handle_unmount},
+    player::{
+        handle_character_delete, handle_client_disconnect, handle_exit_ingame, handle_possess,
+    },
+    trade::handle_process_trade_action,
+};
+
 mod entity_creation;
 mod entity_manipulation;
 mod group_manip;
@@ -45,9 +33,56 @@ mod information;
 mod interaction;
 mod inventory_manip;
 mod invite;
+mod mounting;
 mod player;
 mod trade;
 
+pub trait ServerEvent: Send + Sync + 'static {
+    type SystemData<'a>: specs::SystemData<'a>;
+
+    const NAME: &'static str = std::any::type_name::<Self>();
+
+    fn handle(events: impl ExactSizeIterator<Item = Self>, data: Self::SystemData<'_>);
+}
+
+struct EventHandler<T>(PhantomData<T>);
+impl<T> Default for EventHandler<T> {
+    fn default() -> Self { Self(PhantomData) }
+}
+
+impl<'a, T: ServerEvent> System<'a> for EventHandler<T> {
+    type SystemData = (
+        ReadExpect<'a, crate::metrics::ServerEventMetrics>,
+        ReadExpect<'a, EventBus<T>>,
+        T::SystemData<'a>,
+    );
+
+    const NAME: &'static str = T::NAME;
+    const ORIGIN: common_ecs::Origin = common_ecs::Origin::Server;
+    // TODO: Maybe do another phase here?
+    const PHASE: common_ecs::Phase = common_ecs::Phase::Apply;
+
+    fn run(_job: &mut common_ecs::Job<Self>, (metrics, ev, data): Self::SystemData) {
+        let events = ev.recv_all();
+        metrics
+            .event_count
+            .with_label_values(&[Self::NAME])
+            .inc_by(events.len() as u64);
+        T::handle(events, data)
+    }
+}
+
+fn event_dispatch<T: ServerEvent>(builder: &mut DispatcherBuilder) {
+    dispatch::<EventHandler<T>>(builder, &[])
+}
+
+pub fn register_event_systems(builder: &mut DispatcherBuilder) {
+    inventory_manip::register_event_systems(builder);
+    entity_manipulation::register_event_systems(builder);
+    interaction::register_event_systems(builder);
+    invite::register_event_systems(builder);
+}
+
 pub enum Event {
     ClientConnected {
         entity: EcsEntity,
@@ -62,280 +97,91 @@ pub enum Event {
 }
 
 impl Server {
-    pub fn handle_events(&mut self) -> Vec<Event> {
-        span!(_guard, "handle_events", "Server::handle_events");
-        let mut frontend_events = Vec::new();
-
-        let mut commands = Vec::new();
-        let mut chat_messages = Vec::new();
-
-        let events = self
-            .state
-            .ecs()
-            .read_resource::<EventBus<ServerEvent>>()
-            .recv_all();
-
-        use strum::VariantNames;
-        let mut event_counts = vec![0u32; ServerEventDiscriminants::VARIANTS.len()];
-
-        for event in events {
-            // Count events by variant for metrics
-            event_counts[ServerEventDiscriminants::from(&event) as usize] += 1;
-
-            match event {
-                ServerEvent::Explosion {
-                    pos,
-                    explosion,
-                    owner,
-                } => handle_explosion(self, pos, explosion, owner),
-                ServerEvent::Bonk { pos, owner, target } => handle_bonk(self, pos, owner, target),
-                ServerEvent::Shoot {
-                    entity,
-                    pos,
-                    dir,
-                    body,
-                    light,
-                    projectile,
-                    speed,
-                    object,
-                } => handle_shoot(
-                    self, entity, pos, dir, body, light, projectile, speed, object,
-                ),
-                ServerEvent::Shockwave {
-                    properties,
-                    pos,
-                    ori,
-                } => handle_shockwave(self, properties, pos, ori),
-                ServerEvent::Knockback { entity, impulse } => {
-                    handle_knockback(self, entity, impulse)
-                },
-                ServerEvent::HealthChange { entity, change } => {
-                    handle_health_change(self, entity, change)
-                },
-                ServerEvent::PoiseChange { entity, change } => handle_poise(self, entity, change),
-                ServerEvent::Delete(entity) => handle_delete(self, entity),
-                ServerEvent::Destroy { entity, cause } => handle_destroy(self, entity, cause),
-                ServerEvent::InventoryManip(entity, manip) => handle_inventory(self, entity, manip),
-                ServerEvent::GroupManip(entity, manip) => handle_group(self, entity, manip),
-                ServerEvent::Respawn(entity) => handle_respawn(self, entity),
-                ServerEvent::LandOnGround {
-                    entity,
-                    vel,
-                    surface_normal,
-                } => handle_land_on_ground(self, entity, vel, surface_normal),
-                ServerEvent::EnableLantern(entity) => handle_lantern(self, entity, true),
-                ServerEvent::DisableLantern(entity) => handle_lantern(self, entity, false),
-                ServerEvent::NpcInteract(interactor, target, subject) => {
-                    handle_npc_interaction(self, interactor, target, subject)
-                },
-                ServerEvent::InitiateInvite(interactor, target, kind) => {
-                    handle_invite(self, interactor, target, kind)
-                },
-                ServerEvent::InviteResponse(entity, response) => {
-                    handle_invite_response(self, entity, response)
-                },
-                ServerEvent::ProcessTradeAction(entity, trade_id, action) => {
-                    handle_process_trade_action(self, entity, trade_id, action);
-                },
-                ServerEvent::Mount(mounter, mountee) => handle_mount(self, mounter, mountee),
-                ServerEvent::MountVolume(mounter, volume) => {
-                    handle_mount_volume(self, mounter, volume)
-                },
-                ServerEvent::Unmount(mounter) => handle_unmount(self, mounter),
-                ServerEvent::SetPetStay(command_giver, pet, stay) => {
-                    handle_set_pet_stay(self, command_giver, pet, stay)
-                },
-                ServerEvent::Possess(possessor_uid, possesse_uid) => {
-                    handle_possess(self, possessor_uid, possesse_uid)
-                },
-                ServerEvent::InitCharacterData {
-                    entity,
-                    character_id,
-                    requested_view_distances,
-                } => handle_initialize_character(
-                    self,
-                    entity,
-                    character_id,
-                    requested_view_distances,
-                ),
-                ServerEvent::InitSpectator(entity, requested_view_distances) => {
-                    handle_initialize_spectator(self, entity, requested_view_distances)
-                },
-                ServerEvent::DeleteCharacter {
-                    entity,
-                    requesting_player_uuid,
-                    character_id,
-                } => handle_character_delete(self, entity, requesting_player_uuid, character_id),
-                ServerEvent::UpdateCharacterData {
-                    entity,
-                    components,
-                    metadata,
-                } => {
-                    let (
-                        body,
-                        stats,
-                        skill_set,
-                        inventory,
-                        waypoint,
-                        pets,
-                        active_abilities,
-                        map_marker,
-                    ) = components;
-                    let components = PersistedComponents {
-                        body,
-                        stats,
-                        skill_set,
-                        inventory,
-                        waypoint,
-                        pets,
-                        active_abilities,
-                        map_marker,
-                    };
-                    handle_loaded_character_data(self, entity, components, metadata);
-                },
-                ServerEvent::ExitIngame { entity } => {
-                    handle_exit_ingame(self, entity, false);
-                },
-                ServerEvent::CreateNpc {
-                    pos,
-                    ori,
-                    npc,
-                    rider,
-                } => {
-                    handle_create_npc(self, pos, ori, npc, rider);
-                },
-                ServerEvent::CreateShip {
-                    pos,
-                    ori,
-                    ship,
-                    rtsim_entity,
-                    driver,
-                } => handle_create_ship(self, pos, ori, ship, rtsim_entity, driver, Vec::new()),
-                ServerEvent::CreateWaypoint(pos) => handle_create_waypoint(self, pos),
-                ServerEvent::CreateTeleporter(pos, portal) => {
-                    handle_create_teleporter(self, pos, portal)
-                },
-                ServerEvent::ClientDisconnect(entity, reason) => {
-                    frontend_events.push(handle_client_disconnect(self, entity, reason, false))
-                },
-                ServerEvent::ClientDisconnectWithoutPersistence(entity) => {
-                    frontend_events.push(handle_client_disconnect(
-                        self,
-                        entity,
-                        common::comp::DisconnectReason::Kicked,
-                        true,
-                    ))
-                },
-                ServerEvent::Command(entity, name, args) => {
-                    commands.push((entity, name, args));
-                },
-                ServerEvent::Chat(msg) => {
-                    chat_messages.push(msg);
-                },
-                ServerEvent::Aura {
-                    entity,
-                    aura_change,
-                } => handle_aura(self, entity, aura_change),
-                ServerEvent::Buff {
-                    entity,
-                    buff_change,
-                } => handle_buff(self, entity, buff_change),
-                ServerEvent::EnergyChange { entity, change } => {
-                    handle_energy_change(self, entity, change)
-                },
-                ServerEvent::ComboChange { entity, change } => {
-                    handle_combo_change(self, entity, change)
-                },
-                ServerEvent::ParryHook {
-                    defender,
-                    attacker,
-                    source,
-                } => handle_parry_hook(self, defender, attacker, source),
-                ServerEvent::RequestSiteInfo { entity, id } => handle_site_info(self, entity, id),
-                ServerEvent::MineBlock { entity, pos, tool } => {
-                    handle_mine_block(self, entity, pos, tool)
-                },
-                ServerEvent::TeleportTo {
-                    entity,
-                    target,
-                    max_range,
-                } => handle_teleport_to(self, entity, target, max_range),
-                ServerEvent::CreateSafezone { range, pos } => {
-                    self.state.create_safezone(range, pos).build();
-                },
-                ServerEvent::Sound { sound } => handle_sound(self, &sound),
-                ServerEvent::CreateSprite {
-                    pos,
-                    sprite,
-                    del_timeout,
-                } => handle_create_sprite(self, pos, sprite, del_timeout),
-                ServerEvent::TamePet {
-                    pet_entity,
-                    owner_entity,
-                } => handle_tame_pet(self, pet_entity, owner_entity),
-                ServerEvent::EntityAttackedHook { entity, attacker } => {
-                    handle_entity_attacked_hook(self, entity, attacker)
-                },
-                ServerEvent::ChangeAbility {
-                    entity,
-                    slot,
-                    auxiliary_key,
-                    new_ability,
-                } => handle_change_ability(self, entity, slot, auxiliary_key, new_ability),
-                ServerEvent::UpdateMapMarker { entity, update } => {
-                    handle_update_map_marker(self, entity, update)
-                },
-                ServerEvent::MakeAdmin {
-                    entity,
-                    admin,
-                    uuid,
-                } => handle_make_admin(self, entity, admin, uuid),
-                ServerEvent::ChangeStance { entity, stance } => {
-                    handle_stance_change(self, entity, stance)
-                },
-                ServerEvent::ChangeBody { entity, new_body } => {
-                    handle_change_body(self, entity, new_body)
-                },
-                ServerEvent::RemoveLightEmitter { entity } => {
-                    handle_remove_light_emitter(self, entity)
-                },
-                ServerEvent::TeleportToPosition { entity, position } => {
-                    handle_teleport_to_position(self, entity, position)
-                },
-                ServerEvent::StartTeleporting { entity, portal } => {
-                    handle_start_teleporting(self, entity, portal)
-                },
-                ServerEvent::ToggleSpriteLight {
-                    entity,
-                    pos,
-                    enable,
-                } => handle_toggle_sprite_light(self, entity, pos, enable),
-            }
-        }
-
-        {
+    fn handle_serial_events<T: Send + 'static, F: FnMut(&mut Self, T)>(&mut self, mut f: F) {
+        if let Some(bus) = self.state.ecs_mut().get_mut::<EventBus<T>>() {
+            let events = bus.recv_all_mut();
             let server_event_metrics = self
                 .state
                 .ecs()
                 .read_resource::<crate::metrics::ServerEventMetrics>();
-            event_counts
-                .into_iter()
-                .zip(ServerEventDiscriminants::VARIANTS)
-                .for_each(|(count, event_name)| {
             server_event_metrics
                 .event_count
-                        .with_label_values(&[event_name])
-                        .inc_by(count.into());
-                })
+                .with_label_values(&[std::any::type_name::<T>()])
+                .inc_by(events.len() as u64);
+            drop(server_event_metrics);
+
+            for ev in events {
+                f(self, ev)
+            }
+        }
     }
 
-        for (entity, name, args) in commands {
-            self.process_command(entity, name, args);
+    fn handle_all_serial_events(&mut self, frontend_events: &mut Vec<Event>) {
+        self.handle_serial_events(handle_initialize_character);
+        self.handle_serial_events(handle_initialize_spectator);
+        self.handle_serial_events(handle_loaded_character_data);
+        self.handle_serial_events(|this, ev| {
+            handle_create_npc(this, ev);
+        });
+        self.handle_serial_events(handle_create_ship);
+        self.handle_serial_events(handle_shoot);
+        self.handle_serial_events(handle_shockwave);
+        self.handle_serial_events(handle_create_waypoint);
+        self.handle_serial_events(handle_create_teleporter);
+
+        self.handle_serial_events(handle_character_delete);
+        self.handle_serial_events(|this, ev: ExitIngameEvent| {
+            handle_exit_ingame(this, ev.entity, false)
+        });
+        self.handle_serial_events(|this, ev: ClientDisconnectEvent| {
+            handle_client_disconnect(this, ev.0, ev.1, false);
+        });
+        self.handle_serial_events(|this, ev: ClientDisconnectEvent| {
+            frontend_events.push(handle_client_disconnect(this, ev.0, ev.1, false));
+        });
+        self.handle_serial_events(|this, ev: ClientDisconnectWithoutPersistenceEvent| {
+            frontend_events.push(handle_client_disconnect(
+                this,
+                ev.0,
+                common::comp::DisconnectReason::Kicked,
+                true,
+            ));
+        });
+        self.handle_serial_events(handle_possess);
+        self.handle_serial_events(|this, ev: CommandEvent| {
+            this.process_command(ev.0, ev.1, ev.2);
+        });
+        self.handle_serial_events(|this, ev: ChatEvent| {
+            this.state.send_chat(ev.0);
+        });
+        self.handle_serial_events(handle_mount);
+        self.handle_serial_events(handle_mount_volume);
+        self.handle_serial_events(handle_unmount);
+        self.handle_serial_events(handle_tame_pet);
+        self.handle_serial_events(handle_process_trade_action);
     }
 
-        for msg in chat_messages {
-            self.state.send_chat(msg);
-        }
+    pub fn handle_events(&mut self) -> Vec<Event> {
+        let mut frontend_events = Vec::new();
+        span!(guard, "create event dispatcher");
+        // Run systems to handle events.
+        // Create and run a dispatcher for ecs systems.
+        let mut dispatch_builder =
+            DispatcherBuilder::new().with_pool(Arc::clone(self.state.thread_pool()));
+        register_event_systems(&mut dispatch_builder);
+        // This dispatches all the systems in parallel.
+        let mut dispatcher = dispatch_builder.build();
+        drop(guard);
+
+        span!(guard, "run event systems");
+        dispatcher.dispatch(self.state.ecs());
+        drop(guard);
+
+        span!(guard, "handle serial events");
+        self.handle_all_serial_events(&mut frontend_events);
+        drop(guard);
+
+        self.state.maintain_ecs();
 
         frontend_events
     }

server/src/events/mounting.rs

@@ -0,0 +1,137 @@
+use std::sync::Arc;
+
+use common::{
+    comp::{self, pet::is_mountable},
+    consts::{MAX_MOUNT_RANGE, MAX_SPRITE_MOUNT_RANGE},
+    event::{MountEvent, MountVolumeEvent, UnmountEvent},
+    link::Is,
+    mounting::{Mounting, Rider, VolumeMounting, VolumeRider},
+    rtsim::RtSimEntity,
+    uid::IdMaps,
+};
+use plugin_api::Uid;
+use specs::WorldExt;
+
+use crate::{rtsim::RtSim, state_ext::StateExt, Server};
+
+pub fn within_mounting_range(
+    player_position: Option<&comp::Pos>,
+    mount_position: Option<&comp::Pos>,
+) -> bool {
+    match (player_position, mount_position) {
+        (Some(ppos), Some(ipos)) => ppos.0.distance_squared(ipos.0) < MAX_MOUNT_RANGE.powi(2),
+        _ => false,
+    }
+}
+
+pub fn handle_mount(server: &mut Server, MountEvent(rider, mount): MountEvent) {
+    let state = server.state_mut();
+
+    let within_range = {
+        let positions = state.ecs().read_storage::<comp::Pos>();
+        within_mounting_range(positions.get(rider), positions.get(mount))
+    };
+
+    if within_range {
+        let uids = state.ecs().read_storage::<Uid>();
+        if let (Some(rider_uid), Some(mount_uid)) =
+            (uids.get(rider).copied(), uids.get(mount).copied())
+        {
+            let is_pet_of = |mount, rider_uid| {
+                matches!(
+                    state
+                        .ecs()
+                        .read_storage::<comp::Alignment>()
+                        .get(mount),
+                    Some(comp::Alignment::Owned(owner)) if *owner == rider_uid,
+                )
+            };
+
+            let can_ride = state
+                .ecs()
+                .read_storage()
+                .get(mount)
+                .map_or(false, |mount_body| {
+                    is_mountable(mount_body, state.ecs().read_storage().get(rider))
+                });
+
+            let is_stay = state
+                .ecs()
+                .read_storage::<comp::Agent>()
+                .get(mount)
+                .and_then(|x| x.stay_pos)
+                .is_some();
+
+            if (is_pet_of(mount, rider_uid) || is_pet_of(rider, mount_uid)) && can_ride && !is_stay
+            {
+                drop(uids);
+                let _ = state.link(Mounting {
+                    mount: mount_uid,
+                    rider: rider_uid,
+                });
+            }
+        }
+    }
+}
+
+pub fn handle_mount_volume(
+    server: &mut Server,
+    MountVolumeEvent(rider, volume_pos): MountVolumeEvent,
+) {
+    let state = server.state_mut();
+
+    let block_transform = volume_pos.get_block_and_transform(
+        &state.terrain(),
+        &state.ecs().read_resource(),
+        |e| {
+            state
+                .read_storage()
+                .get(e)
+                .copied()
+                .zip(state.read_storage().get(e).copied())
+        },
+        &state.read_storage(),
+    );
+
+    if let Some((mat, _, block)) = block_transform
+    && let Some(mount_offset) = block.mount_offset() {
+        let mount_pos = (mat * mount_offset.0.with_w(1.0)).xyz();
+        let within_range = {
+            let positions = state.ecs().read_storage::<comp::Pos>();
+            positions.get(rider).map_or(false, |pos| pos.0.distance_squared(mount_pos) < MAX_SPRITE_MOUNT_RANGE.powi(2))
+        };
+
+        let maybe_uid = state.ecs().read_storage::<Uid>().get(rider).copied();
+
+        if let Some(rider) = maybe_uid && within_range {
+            let _link_successful = state.link(VolumeMounting {
+                pos: volume_pos,
+                block,
+                rider,
+            }).is_ok();
+            #[cfg(feature = "worldgen")]
+            if _link_successful {
+                let uid_allocator = state.ecs().read_resource::<IdMaps>();
+                if let Some(rider_entity) = uid_allocator.uid_entity(rider)
+                    && let Some(rider_actor) = state.entity_as_actor(rider_entity)
+                    && let Some(volume_pos) = volume_pos.try_map_entity(|uid| {
+                        let entity = uid_allocator.uid_entity(uid)?;
+                        state.read_storage::<RtSimEntity>().get(entity).map(|v| v.0)
+                    }) {
+                    state.ecs().write_resource::<RtSim>().hook_character_mount_volume(
+                            &state.ecs().read_resource::<Arc<world::World>>(),
+                            state.ecs().read_resource::<world::IndexOwned>().as_index_ref(),
+                            volume_pos,
+                            rider_actor,
+                    );
+                }
+            }
+        }
+    }
+}
+
+pub fn handle_unmount(server: &mut Server, UnmountEvent(rider): UnmountEvent) {
+    let state = server.state_mut();
+    state.ecs().write_storage::<Is<Rider>>().remove(rider);
+    state.ecs().write_storage::<Is<VolumeRider>>().remove(rider);
+}

server/src/events/player.rs

@@ -4,9 +4,9 @@ use crate::{
     state_ext::StateExt, BattleModeBuffer, Server,
 };
 use common::{
-    character::CharacterId,
     comp,
     comp::{group, pet::is_tameable, Presence, PresenceKind},
+    event::{DeleteCharacterEvent, PossessEvent},
     resources::Time,
     uid::{IdMaps, Uid},
 };
@@ -16,12 +16,7 @@ use common_state::State;
 use specs::{Builder, Entity as EcsEntity, Join, WorldExt};
 use tracing::{debug, error, trace, warn, Instrument};
 
-pub fn handle_character_delete(
-    server: &mut Server,
-    entity: EcsEntity,
-    requesting_player_uuid: String,
-    character_id: CharacterId,
-) {
+pub fn handle_character_delete(server: &mut Server, ev: DeleteCharacterEvent) {
     // Can't process a character delete for a player that has an in-game presence,
     // so kick them out before processing the delete.
     // NOTE: This relies on StateExt::handle_initialize_character adding the
@@ -29,19 +24,19 @@ pub fn handle_character_delete(
     // is in-game.
     let has_presence = {
         let presences = server.state.ecs().read_storage::<Presence>();
-        presences.get(entity).is_some()
+        presences.get(ev.entity).is_some()
     };
     if has_presence {
         warn!(
-            ?requesting_player_uuid,
-            ?character_id,
+            ?ev.requesting_player_uuid,
+            ?ev.character_id,
             "Character delete received while in-game, disconnecting client."
         );
-        handle_exit_ingame(server, entity, true);
+        handle_exit_ingame(server, ev.entity, true);
     }
 
     let mut updater = server.state.ecs().fetch_mut::<CharacterUpdater>();
-    updater.queue_character_deletion(requesting_player_uuid, character_id);
+    updater.queue_character_deletion(ev.requesting_player_uuid, ev.character_id);
 }
 
 pub fn handle_exit_ingame(server: &mut Server, entity: EcsEntity, skip_persistence: bool) {
@@ -341,7 +336,10 @@ fn persist_entity(state: &mut State, entity: EcsEntity) -> EcsEntity {
 /// FIXME: This code is dangerous and needs to be refactored.  We can't just
 /// comment it out, but it needs to be fixed for a variety of reasons.  Get rid
 /// of this ASAP!
-pub fn handle_possess(server: &mut Server, possessor_uid: Uid, possessee_uid: Uid) {
+pub fn handle_possess(
+    server: &mut Server,
+    PossessEvent(possessor_uid, possessee_uid): PossessEvent,
+) {
     use crate::presence::RegionSubscription;
     use common::{
         comp::{inventory::slot::EquipSlot, item, slot::Slot, Inventory},

server/src/events/trade.rs

@@ -7,7 +7,8 @@ use common::{
             Inventory,
         },
     },
-    trade::{PendingTrade, ReducedInventory, TradeAction, TradeId, TradeResult, Trades},
+    event::ProcessTradeActionEvent,
+    trade::{PendingTrade, ReducedInventory, TradeAction, TradeResult, Trades},
 };
 use common_net::{
     msg::ServerGeneral,
@@ -19,8 +20,8 @@ use std::cmp::Ordering;
 use tracing::{error, trace};
 use world::IndexOwned;
 
-fn notify_agent_simple(
-    mut agents: specs::WriteStorage<Agent>,
+pub fn notify_agent_simple(
+    agents: &mut specs::WriteStorage<Agent>,
     entity: EcsEntity,
     event: AgentEvent,
 ) {
@@ -55,9 +56,7 @@ fn notify_agent_prices(
 /// Invoked when the trade UI is up, handling item changes, accepts, etc
 pub(super) fn handle_process_trade_action(
     server: &mut Server,
-    entity: EcsEntity,
-    trade_id: TradeId,
-    action: TradeAction,
+    ProcessTradeActionEvent(entity, trade_id, action): ProcessTradeActionEvent,
 ) {
     if let Some(uid) = server.state.ecs().uid_from_entity(entity) {
         let mut trades = server.state.ecs().write_resource::<Trades>();
@@ -68,7 +67,7 @@ pub(super) fn handle_process_trade_action(
                 .map(|e| {
                     server.notify_client(e, ServerGeneral::FinishedTrade(TradeResult::Declined));
                     notify_agent_simple(
-                        server.state.ecs().write_storage::<Agent>(),
+                        &mut server.state.ecs().write_storage(),
                         e,
                         AgentEvent::FinishedTrade(TradeResult::Declined),
                     );
@@ -95,7 +94,7 @@ pub(super) fn handle_process_trade_action(
                         if let Some(e) = server.state.ecs().entity_from_uid(*party) {
                             server.notify_client(e, ServerGeneral::FinishedTrade(result.clone()));
                             notify_agent_simple(
-                                server.state.ecs().write_storage::<Agent>(),
+                                &mut server.state.ecs().write_storage(),
                                 e,
                                 AgentEvent::FinishedTrade(result.clone()),
                             );
@@ -185,7 +184,7 @@ pub(crate) fn cancel_trades_for(state: &mut common_state::State, entity: EcsEnti
                 c.send_fallible(ServerGeneral::FinishedTrade(TradeResult::Declined));
             }
             notify_agent_simple(
-                ecs.write_storage::<Agent>(),
+                &mut ecs.write_storage::<Agent>(),
                 e,
                 AgentEvent::FinishedTrade(TradeResult::Declined),
             );

server/src/lib.rs

@@ -5,7 +5,14 @@
     clippy::needless_pass_by_ref_mut //until we find a better way for specs
 )]
 #![deny(clippy::clone_on_ref_ptr)]
-#![feature(box_patterns, let_chains, never_type, option_zip, unwrap_infallible)]
+#![feature(
+    box_patterns,
+    let_chains,
+    never_type,
+    option_zip,
+    unwrap_infallible,
+    const_type_name
+)]
 
 pub mod automod;
 mod character_creator;
@@ -72,7 +79,10 @@ use common::{
     character::{CharacterId, CharacterItem},
     cmd::ServerChatCommand,
     comp,
-    event::{EventBus, ServerEvent},
+    event::{
+        register_event_busses, ClientDisconnectEvent, ClientDisconnectWithoutPersistenceEvent,
+        EventBus, ExitIngameEvent, UpdateCharacterDataEvent,
+    },
     link::Is,
     mounting::{Volume, VolumeRider},
     region::RegionMap,
@@ -324,7 +334,8 @@ impl Server {
         state.ecs_mut().insert(DataDir {
             path: data_dir.to_owned(),
         });
-        state.ecs_mut().insert(EventBus::<ServerEvent>::default());
+
+        register_event_busses(state.ecs_mut());
         state.ecs_mut().insert(Vec::<ChunkRequest>::new());
         state
             .ecs_mut()
@@ -989,7 +1000,7 @@ impl Server {
                             ),
                         },
                         CharacterScreenResponseKind::CharacterData(result) => {
-                            let message = match *result {
+                            match *result {
                                 Ok((character_data, skill_set_persistence_load_error)) => {
                                     let PersistedComponents {
                                         body,
@@ -1013,11 +1024,11 @@ impl Server {
                                     );
                                     // TODO: Does this need to be a server event? E.g. we could
                                     // just handle it here.
-                                    ServerEvent::UpdateCharacterData {
+                                    self.state.emit_event_now(UpdateCharacterDataEvent {
                                         entity: response.target_entity,
                                         components: character_data,
                                         metadata: skill_set_persistence_load_error,
-                                    }
+                                    })
                                 },
                                 Err(error) => {
                                     // We failed to load data for the character from the DB. Notify
@@ -1031,16 +1042,11 @@ impl Server {
                                     );
 
                                     // Clean up the entity data on the server
-                                    ServerEvent::ExitIngame {
+                                    self.state.emit_event_now(ExitIngameEvent {
                                         entity: response.target_entity,
-                                    }
+                                    })
                                 },
-                            };
-
-                            self.state
-                                .ecs()
-                                .read_resource::<EventBus<ServerEvent>>()
-                                .emit_now(message);
+                            }
                         },
                     }
                 },
@@ -1194,15 +1200,15 @@ impl Server {
             );
             for (_, entity) in (&clients, &entities).join() {
                 info!("Emitting client disconnect event for entity: {:?}", entity);
-                let event = if with_persistence {
-                    ServerEvent::ClientDisconnect(entity, comp::DisconnectReason::Kicked)
+                if with_persistence {
+                    self.state.emit_event_now(ClientDisconnectEvent(
+                        entity,
+                        comp::DisconnectReason::Kicked,
+                    ))
                 } else {
-                    ServerEvent::ClientDisconnectWithoutPersistence(entity)
-                };
                     self.state
-                    .ecs()
-                    .read_resource::<EventBus<ServerEvent>>()
-                    .emit_now(event);
+                        .emit_event_now(ClientDisconnectWithoutPersistenceEvent(entity))
+                };
             }
 
             self.disconnect_all_clients_requested = false;

server/src/rtsim/tick.rs

@@ -5,7 +5,7 @@ use crate::sys::terrain::NpcData;
 use common::{
     calendar::Calendar,
     comp::{self, Agent, Body, Presence, PresenceKind},
-    event::{EventBus, NpcBuilder, ServerEvent},
+    event::{CreateNpcEvent, CreateShipEvent, DeleteEvent, EventBus, NpcBuilder},
     generation::{BodyBuilder, EntityConfig, EntityInfo},
     resources::{DeltaTime, Time, TimeOfDay},
     rtsim::{Actor, NpcId, RtSimEntity},
@@ -236,7 +236,9 @@ impl<'a> System<'a> for Sys {
         Read<'a, DeltaTime>,
         Read<'a, Time>,
         Read<'a, TimeOfDay>,
-        Read<'a, EventBus<ServerEvent>>,
+        Read<'a, EventBus<CreateShipEvent>>,
+        Read<'a, EventBus<CreateNpcEvent>>,
+        Read<'a, EventBus<DeleteEvent>>,
         WriteExpect<'a, RtSim>,
         ReadExpect<'a, Arc<world::World>>,
         ReadExpect<'a, world::IndexOwned>,
@@ -259,7 +261,9 @@ impl<'a> System<'a> for Sys {
             dt,
             time,
             time_of_day,
-            server_event_bus,
+            create_ship_events,
+            create_npc_events,
+            delete_events,
             mut rtsim,
             world,
             index,
@@ -271,7 +275,9 @@ impl<'a> System<'a> for Sys {
             calendar,
         ): Self::SystemData,
     ) {
-        let mut emitter = server_event_bus.emitter();
+        let mut create_ship_emitter = create_ship_events.emitter();
+        let mut create_npc_emitter = create_npc_events.emitter();
+        let mut delete_emitter = delete_events.emitter();
         let rtsim = &mut *rtsim;
         let calendar_data = (*time_of_day, (*calendar).clone());
 
@@ -317,7 +323,7 @@ impl<'a> System<'a> for Sys {
 
         let mut create_event = |id: NpcId, npc: &Npc, steering: Option<NpcBuilder>| match npc.body {
             Body::Ship(body) => {
-                emitter.emit(ServerEvent::CreateShip {
+                create_ship_emitter.emit(CreateShipEvent {
                     pos: comp::Pos(npc.wpos),
                     ori: comp::Ori::from(Dir::new(npc.dir.with_z(0.0))),
                     ship: body,
@@ -333,7 +339,7 @@ impl<'a> System<'a> for Sys {
                     Some(&calendar_data),
                 );
 
-                emitter.emit(match NpcData::from_entity_info(entity_info) {
+                create_npc_emitter.emit(match NpcData::from_entity_info(entity_info) {
                     NpcData::Data {
                         pos,
                         stats,
@@ -346,7 +352,7 @@ impl<'a> System<'a> for Sys {
                         alignment,
                         scale,
                         loot,
-                    } => ServerEvent::CreateNpc {
+                    } => CreateNpcEvent {
                         pos,
                         ori: comp::Ori::from(Dir::new(npc.dir.with_z(0.0))),
                         npc: NpcBuilder::new(stats, body, alignment)
@@ -458,7 +464,6 @@ impl<'a> System<'a> for Sys {
             }
         }
 
-        let mut emitter = server_event_bus.emitter();
         // Synchronise rtsim NPC with entity data
         for (entity, pos, rtsim_entity, agent) in (
             &entities,
@@ -489,7 +494,7 @@ impl<'a> System<'a> for Sys {
                         }
                     },
                     SimulationMode::Simulated => {
-                        emitter.emit(ServerEvent::Delete(entity));
+                        delete_emitter.emit(DeleteEvent(entity));
                     },
                 }
             }

server/src/state_ext.rs

@@ -42,7 +42,10 @@ use common_net::{
 };
 use common_state::State;
 use rand::prelude::*;
-use specs::{Builder, Entity as EcsEntity, EntityBuilder as EcsEntityBuilder, Join, WorldExt};
+use specs::{
+    storage::{GenericReadStorage, GenericWriteStorage},
+    Builder, Entity as EcsEntity, EntityBuilder as EcsEntityBuilder, Join, WorldExt, WriteStorage,
+};
 use std::time::{Duration, Instant};
 use tracing::{error, trace, warn};
 use vek::*;
@@ -1253,28 +1256,47 @@ impl StateExt for State {
         dismount_volume: bool,
         f: impl for<'a> FnOnce(&'a mut comp::Pos) -> T,
     ) -> Result<T, Content> {
-        if dismount_volume {
-            self.ecs().write_storage::<Is<VolumeRider>>().remove(entity);
+        let ecs = self.ecs_mut();
+        position_mut(
+            entity,
+            dismount_volume,
+            f,
+            &ecs.read_resource(),
+            &mut ecs.write_storage(),
+            ecs.write_storage(),
+            ecs.write_storage(),
+            ecs.read_storage(),
+            ecs.read_storage(),
+            ecs.read_storage(),
+        )
+    }
 }
 
-        let entity = self
-            .read_storage::<Is<Rider>>()
+pub fn position_mut<T>(
+    entity: EcsEntity,
+    dismount_volume: bool,
+    f: impl for<'a> FnOnce(&'a mut comp::Pos) -> T,
+    id_maps: &IdMaps,
+    is_volume_riders: &mut WriteStorage<Is<VolumeRider>>,
+    mut positions: impl GenericWriteStorage<Component = comp::Pos>,
+    mut force_updates: impl GenericWriteStorage<Component = comp::ForceUpdate>,
+    is_riders: impl GenericReadStorage<Component = Is<Rider>>,
+    presences: impl GenericReadStorage<Component = Presence>,
+    clients: impl GenericReadStorage<Component = Client>,
+) -> Result<T, Content> {
+    if dismount_volume {
+        is_volume_riders.remove(entity);
+    }
+
+    let entity = is_riders
         .get(entity)
-            .and_then(|is_rider| {
-                self.ecs()
-                    .read_resource::<IdMaps>()
-                    .uid_entity(is_rider.mount)
-            })
+        .and_then(|is_rider| id_maps.uid_entity(is_rider.mount))
         .map(Ok)
         .or_else(|| {
-                self.read_storage::<Is<VolumeRider>>()
-                    .get(entity)
-                    .and_then(|volume_rider| {
+            is_volume_riders.get(entity).and_then(|volume_rider| {
                 Some(match volume_rider.pos.kind {
                     common::mounting::Volume::Terrain => Err("Tried to move the world."),
-                            common::mounting::Volume::Entity(uid) => {
-                                Ok(self.ecs().read_resource::<IdMaps>().uid_entity(uid)?)
-                            },
+                    common::mounting::Volume::Entity(uid) => Ok(id_maps.uid_entity(uid)?),
                 })
             })
         })
@@ -1282,9 +1304,7 @@ impl StateExt for State {
 
     let mut maybe_pos = None;
 
-        let res = self
-            .ecs()
-            .write_storage::<comp::Pos>()
+    let res = positions
         .get_mut(entity)
         .map(|pos| {
             let res = f(pos);
@@ -1297,19 +1317,16 @@ impl StateExt for State {
         ));
 
     if let Some(pos) = maybe_pos {
-            if self
-                .ecs()
-                .read_storage::<Presence>()
+        if presences
             .get(entity)
             .map(|presence| presence.kind == PresenceKind::Spectator)
             .unwrap_or(false)
         {
-                self.read_storage::<Client>().get(entity).map(|client| {
+            clients.get(entity).map(|client| {
                 client.send_fallible(ServerGeneral::SpectatePosition(pos));
             });
         } else {
-                self.ecs()
-                    .write_storage::<comp::ForceUpdate>()
+            force_updates
                 .get_mut(entity)
                 .map(|force_update| force_update.update());
         }
@@ -1317,7 +1334,6 @@ impl StateExt for State {
 
     res
 }
-}
 
 fn send_to_group(g: &Group, ecs: &specs::World, msg: &comp::ChatMsg) {
     for (client, group) in (&ecs.read_storage::<Client>(), &ecs.read_storage::<Group>()).join() {

server/src/sys/agent.rs

@@ -1,4 +1,5 @@
 pub mod behavior_tree;
+use server_agent::data::AgentEvents;
 pub use server_agent::{action_nodes, attack, consts, data, util};
 use vek::Vec3;
 
@@ -11,7 +12,6 @@ use common::{
         self, inventory::slot::EquipSlot, item::ItemDesc, Agent, Alignment, Body, CharacterState,
         Controller, Health, InputKind, Scale,
     },
-    event::{EventBus, ServerEvent},
     mounting::Volume,
     path::TraversalConfig,
 };
@@ -19,7 +19,7 @@ use common_base::prof_span;
 use common_ecs::{Job, Origin, ParMode, Phase, System};
 use rand::thread_rng;
 use rayon::iter::ParallelIterator;
-use specs::{LendJoin, ParJoin, Read, WriteStorage};
+use specs::{LendJoin, ParJoin, WriteStorage};
 
 /// This system will allow NPCs to modify their controller
 #[derive(Default)]
@@ -27,7 +27,7 @@ pub struct Sys;
 impl<'a> System<'a> for Sys {
     type SystemData = (
         ReadData<'a>,
-        Read<'a, EventBus<ServerEvent>>,
+        AgentEvents<'a>,
         WriteStorage<'a, Agent>,
         WriteStorage<'a, Controller>,
     );
@@ -38,7 +38,7 @@ impl<'a> System<'a> for Sys {
 
     fn run(
         job: &mut Job<Self>,
-        (read_data, event_bus, mut agents, mut controllers): Self::SystemData,
+        (read_data, events, mut agents, mut controllers): Self::SystemData,
     ) {
         job.cpu_stats.measure(ParMode::Rayon);
 
@@ -97,7 +97,7 @@ impl<'a> System<'a> for Sys {
                     rtsim_entity,
                     (_, is_rider, is_volume_rider),
                 )| {
-                    let mut event_emitter = event_bus.emitter();
+                    let mut emitters = events.get_emitters();
                     let mut rng = thread_rng();
 
                     // The entity that is moving, if riding it's the mount, otherwise it's itself
@@ -263,7 +263,7 @@ impl<'a> System<'a> for Sys {
                         agent,
                         agent_data: data,
                         read_data: &read_data,
-                        event_emitter: &mut event_emitter,
+                        emitters: &mut emitters,
                         controller,
                         rng: &mut rng,
                     };

server/src/sys/agent/behavior_tree.rs

@@ -8,11 +8,11 @@ use common::{
         Agent, Alignment, BehaviorCapability, BehaviorState, Body, BuffKind, ControlAction,
         ControlEvent, Controller, InputKind, InventoryEvent, Pos, UtteranceKind,
     },
-    event::{Emitter, ServerEvent},
     path::TraversalConfig,
     rtsim::{NpcAction, RtSimEntity},
 };
 use rand::{prelude::ThreadRng, thread_rng, Rng};
+use server_agent::data::AgentEmitters;
 use specs::Entity as EcsEntity;
 use vek::{Vec2, Vec3};
 
@@ -39,7 +39,7 @@ pub struct BehaviorData<'a, 'b, 'c> {
     pub agent: &'a mut Agent,
     pub agent_data: AgentData<'a>,
     pub read_data: &'a ReadData<'a>,
-    pub event_emitter: &'a mut Emitter<'c, ServerEvent>,
+    pub emitters: &'a mut AgentEmitters<'c>,
     pub controller: &'a mut Controller,
     pub rng: &'b mut ThreadRng,
 }
@@ -454,7 +454,7 @@ fn attack_if_owner_hurt(bdata: &mut BehaviorData) -> bool {
                     bdata.agent,
                     bdata.read_data,
                     bdata.controller,
-                    bdata.event_emitter,
+                    bdata.emitters,
                     bdata.rng,
                 );
                 return true;
@@ -519,7 +519,7 @@ fn handle_rtsim_actions(bdata: &mut BehaviorData) -> bool {
                         }
                     }
                     bdata.controller.push_utterance(UtteranceKind::Greeting);
-                    bdata.agent_data.chat_npc(msg, bdata.event_emitter);
+                    bdata.agent_data.chat_npc(msg, bdata.emitters);
                 }
             },
             NpcAction::Attack(target) => {
@@ -574,7 +574,7 @@ fn handle_timed_events(bdata: &mut BehaviorData) -> bool {
                     bdata.agent,
                     bdata.controller,
                     bdata.read_data,
-                    bdata.event_emitter,
+                    bdata.emitters,
                     AgentData::is_enemy,
                 );
             } else {
@@ -582,7 +582,7 @@ fn handle_timed_events(bdata: &mut BehaviorData) -> bool {
                     bdata.agent,
                     bdata.controller,
                     bdata.read_data,
-                    bdata.event_emitter,
+                    bdata.emitters,
                     bdata.rng,
                 );
             }
@@ -728,7 +728,7 @@ fn do_combat(bdata: &mut BehaviorData) -> bool {
         agent,
         agent_data,
         read_data,
-        event_emitter,
+        emitters,
         controller,
         rng,
     } = bdata;
@@ -777,7 +777,7 @@ fn do_combat(bdata: &mut BehaviorData) -> bool {
                     [ActionStateBehaviorTreeTimers::TimerBehaviorTree as usize]
                     == 0.0
                 {
-                    agent_data.cry_out(agent, event_emitter, read_data);
+                    agent_data.cry_out(agent, emitters, read_data);
                     agent.behavior_state.timers
                         [ActionStateBehaviorTreeTimers::TimerBehaviorTree as usize] = 0.01;
                     agent.flee_from_pos = {
@@ -803,12 +803,12 @@ fn do_combat(bdata: &mut BehaviorData) -> bool {
                         [ActionStateBehaviorTreeTimers::TimerBehaviorTree as usize] = 0.0;
                     agent.target = None;
                     agent.flee_from_pos = None;
-                    agent_data.idle(agent, controller, read_data, event_emitter, rng);
+                    agent_data.idle(agent, controller, read_data, emitters, rng);
                 }
             } else if is_dead(target, read_data) {
-                agent_data.exclaim_relief_about_enemy_dead(agent, event_emitter);
+                agent_data.exclaim_relief_about_enemy_dead(agent, emitters);
                 agent.target = None;
-                agent_data.idle(agent, controller, read_data, event_emitter, rng);
+                agent_data.idle(agent, controller, read_data, emitters, rng);
             } else if is_invulnerable(target, read_data)
                 || stop_pursuing(
                     dist_sqrd,
@@ -820,7 +820,7 @@ fn do_combat(bdata: &mut BehaviorData) -> bool {
                 )
             {
                 agent.target = None;
-                agent_data.idle(agent, controller, read_data, event_emitter, rng);
+                agent_data.idle(agent, controller, read_data, emitters, rng);
             } else {
                 let is_time_to_retarget =
                     read_data.time.0 - selected_at > RETARGETING_THRESHOLD_SECONDS;
@@ -830,7 +830,7 @@ fn do_combat(bdata: &mut BehaviorData) -> bool {
                         agent,
                         controller,
                         read_data,
-                        event_emitter,
+                        emitters,
                         AgentData::is_enemy,
                     );
                 }
@@ -849,7 +849,7 @@ fn do_combat(bdata: &mut BehaviorData) -> bool {
                         controller,
                         target,
                         read_data,
-                        event_emitter,
+                        emitters,
                         rng,
                         remembers_fight_with(agent_data.rtsim_entity, read_data, target),
                     );

server/src/sys/agent/behavior_tree/interaction.rs

@@ -9,7 +9,7 @@ use common::{
         BehaviorState, Content, ControlAction, Item, TradingBehavior, UnresolvedChatMsg,
         UtteranceKind,
     },
-    event::ServerEvent,
+    event::{ChatEvent, EmitExt, ProcessTradeActionEvent},
     rtsim::{Actor, NpcInput, PersonalityTrait},
     trade::{TradeAction, TradePhase, TradeResult},
 };
@@ -76,7 +76,7 @@ pub fn handle_inbox_talk(bdata: &mut BehaviorData) -> bool {
         agent,
         agent_data,
         read_data,
-        event_emitter,
+        emitters,
         controller,
         ..
     } = bdata;
@@ -171,7 +171,7 @@ pub fn handle_inbox_talk(bdata: &mut BehaviorData) -> bool {
                                     standard_response_msg()
                                 };
                                 // TODO: Localise
-                                agent_data.chat_npc(Content::Plain(msg), event_emitter);
+                                agent_data.chat_npc(Content::Plain(msg), emitters);
                             } else {
                                 let mut rng = thread_rng();
                                 agent_data.chat_npc(
@@ -179,7 +179,7 @@ pub fn handle_inbox_talk(bdata: &mut BehaviorData) -> bool {
                                         .rtsim_controller
                                         .personality
                                         .get_generic_comment(&mut rng),
-                                    event_emitter,
+                                    emitters,
                                 );
                             }
                         }
@@ -191,13 +191,13 @@ pub fn handle_inbox_talk(bdata: &mut BehaviorData) -> bool {
                                 agent_data.chat_npc_if_allowed_to_speak(
                                     Content::localized("npc-speech-merchant_advertisement"),
                                     agent,
-                                    event_emitter,
+                                    emitters,
                                 );
                             } else {
                                 agent_data.chat_npc_if_allowed_to_speak(
                                     Content::localized("npc-speech-merchant_busy"),
                                     agent,
-                                    event_emitter,
+                                    emitters,
                                 );
                             }
                         } else {
@@ -206,7 +206,7 @@ pub fn handle_inbox_talk(bdata: &mut BehaviorData) -> bool {
                             agent_data.chat_npc_if_allowed_to_speak(
                                 Content::localized("npc-speech-villager_decline_trade"),
                                 agent,
-                                event_emitter,
+                                emitters,
                             );
                         }
                     },
@@ -224,7 +224,7 @@ pub fn handle_inbox_talk(bdata: &mut BehaviorData) -> bool {
                                 "{} ? I think it's {} {} from here!",
                                 location.name, dist, dir
                             );
-                            agent_data.chat_npc(Content::Plain(msg), event_emitter);
+                            agent_data.chat_npc(Content::Plain(msg), emitters);
                         }
                     },
                     Subject::Person(person) => {
@@ -259,7 +259,7 @@ pub fn handle_inbox_talk(bdata: &mut BehaviorData) -> bool {
                                     person.name()
                                 )
                             };
-                            agent_data.chat_npc(Content::Plain(msg), event_emitter);
+                            agent_data.chat_npc(Content::Plain(msg), emitters);
                         }
                     },
                     Subject::Work => {},
@@ -276,7 +276,7 @@ pub fn handle_inbox_trade_invite(bdata: &mut BehaviorData) -> bool {
         agent,
         agent_data,
         read_data,
-        event_emitter,
+        emitters,
         controller,
         ..
     } = bdata;
@@ -313,7 +313,7 @@ pub fn handle_inbox_trade_invite(bdata: &mut BehaviorData) -> bool {
                 agent_data.chat_npc_if_allowed_to_speak(
                     Content::localized("npc-speech-merchant_busy"),
                     agent,
-                    event_emitter,
+                    emitters,
                 );
             }
         } else {
@@ -322,7 +322,7 @@ pub fn handle_inbox_trade_invite(bdata: &mut BehaviorData) -> bool {
             agent_data.chat_npc_if_allowed_to_speak(
                 Content::localized("npc-speech-villager_decline_trade"),
                 agent,
-                event_emitter,
+                emitters,
             );
         }
     }
@@ -364,7 +364,7 @@ pub fn handle_inbox_finished_trade(bdata: &mut BehaviorData) -> bool {
     let BehaviorData {
         agent,
         agent_data,
-        event_emitter,
+        emitters,
         ..
     } = bdata;
 
@@ -379,14 +379,14 @@ pub fn handle_inbox_finished_trade(bdata: &mut BehaviorData) -> bool {
                     agent_data.chat_npc_if_allowed_to_speak(
                         Content::localized("npc-speech-merchant_trade_successful"),
                         agent,
-                        event_emitter,
+                        emitters,
                     );
                 },
                 _ => {
                     agent_data.chat_npc_if_allowed_to_speak(
                         Content::localized("npc-speech-merchant_trade_declined"),
                         agent,
-                        event_emitter,
+                        emitters,
                     );
                 },
             }
@@ -404,7 +404,7 @@ pub fn handle_inbox_update_pending_trade(bdata: &mut BehaviorData) -> bool {
         agent,
         agent_data,
         read_data,
-        event_emitter,
+        emitters,
         ..
     } = bdata;
 
@@ -422,13 +422,13 @@ pub fn handle_inbox_update_pending_trade(bdata: &mut BehaviorData) -> bool {
                     .as_ref()
                     .and_then(|tgt_data| read_data.uids.get(tgt_data.target))
                 {
-                    event_emitter.emit(ServerEvent::Chat(UnresolvedChatMsg::npc_tell(
+                    emitters.emit(ChatEvent(UnresolvedChatMsg::npc_tell(
                         *agent_data.uid,
                         *with,
                         content,
                     )));
                 } else {
-                    event_emitter.emit(ServerEvent::Chat(UnresolvedChatMsg::npc_say(
+                    emitters.emit(ChatEvent(UnresolvedChatMsg::npc_say(
                         *agent_data.uid,
                         content,
                     )));
@@ -457,7 +457,7 @@ pub fn handle_inbox_update_pending_trade(bdata: &mut BehaviorData) -> bool {
                                 // the phase is included in the message, this shouldn't
                                 // result in fully accepting an unfavourable trade))
                                 if !pending.accept_flags[who] && !pending.is_empty_trade() {
-                                    event_emitter.emit(ServerEvent::ProcessTradeAction(
+                                    emitters.emit(ProcessTradeActionEvent(
                                         *agent_data.entity,
                                         tradeid,
                                         TradeAction::Accept(pending.phase),
@@ -482,7 +482,7 @@ pub fn handle_inbox_update_pending_trade(bdata: &mut BehaviorData) -> bool {
                                     // decline
                                     agent.behavior.unset(BehaviorState::TRADING);
                                     agent.target = None;
-                                    event_emitter.emit(ServerEvent::ProcessTradeAction(
+                                    emitters.emit(ProcessTradeActionEvent(
                                         *agent_data.entity,
                                         tradeid,
                                         TradeAction::Decline,
@@ -517,7 +517,7 @@ pub fn handle_inbox_update_pending_trade(bdata: &mut BehaviorData) -> bool {
                         && !pending.offers[1 - who].is_empty()
                         && only_food
                     {
-                        event_emitter.emit(ServerEvent::ProcessTradeAction(
+                        emitters.emit(ProcessTradeActionEvent(
                             *agent_data.entity,
                             tradeid,
                             TradeAction::Accept(pending.phase),
@@ -527,7 +527,7 @@ pub fn handle_inbox_update_pending_trade(bdata: &mut BehaviorData) -> bool {
                 TradingBehavior::None => {
                     agent.behavior.unset(BehaviorState::TRADING);
                     agent.target = None;
-                    event_emitter.emit(ServerEvent::ProcessTradeAction(
+                    emitters.emit(ProcessTradeActionEvent(
                         *agent_data.entity,
                         tradeid,
                         TradeAction::Decline,
@@ -549,7 +549,7 @@ pub fn handle_inbox_cancel_interactions(bdata: &mut BehaviorData) -> bool {
     let BehaviorData {
         agent,
         agent_data,
-        event_emitter,
+        emitters,
         controller,
         ..
     } = bdata;
@@ -566,7 +566,7 @@ pub fn handle_inbox_cancel_interactions(bdata: &mut BehaviorData) -> bool {
                     agent_data.chat_npc_if_allowed_to_speak(
                         Content::localized("npc-speech-villager_busy"),
                         agent,
-                        event_emitter,
+                        emitters,
                     );
                 }
             },
@@ -581,13 +581,13 @@ pub fn handle_inbox_cancel_interactions(bdata: &mut BehaviorData) -> bool {
                             agent_data.chat_npc_if_allowed_to_speak(
                                 Content::localized("npc-speech-merchant_busy"),
                                 agent,
-                                event_emitter,
+                                emitters,
                             );
                         } else {
                             agent_data.chat_npc_if_allowed_to_speak(
                                 Content::localized("npc-speech-villager_busy"),
                                 agent,
-                                event_emitter,
+                                emitters,
                             );
                         }
                     }
@@ -602,14 +602,14 @@ pub fn handle_inbox_cancel_interactions(bdata: &mut BehaviorData) -> bool {
                             agent_data.chat_npc_if_allowed_to_speak(
                                 Content::localized("npc-speech-merchant_trade_successful"),
                                 agent,
-                                event_emitter,
+                                emitters,
                             );
                         },
                         _ => {
                             agent_data.chat_npc_if_allowed_to_speak(
                                 Content::localized("npc-speech-merchant_trade_declined"),
                                 agent,
-                                event_emitter,
+                                emitters,
                             );
                         },
                     }
@@ -622,7 +622,7 @@ pub fn handle_inbox_cancel_interactions(bdata: &mut BehaviorData) -> bool {
                 let (tradeid, _pending, _prices, _inventories) = &**boxval;
                 agent.behavior.unset(BehaviorState::TRADING);
                 agent.target = None;
-                event_emitter.emit(ServerEvent::ProcessTradeAction(
+                emitters.emit(ProcessTradeActionEvent(
                     *agent_data.entity,
                     *tradeid,
                     TradeAction::Decline,
@@ -630,7 +630,7 @@ pub fn handle_inbox_cancel_interactions(bdata: &mut BehaviorData) -> bool {
                 agent_data.chat_npc_if_allowed_to_speak(
                     Content::localized("npc-speech-merchant_trade_cancelled_hostile"),
                     agent,
-                    event_emitter,
+                    emitters,
                 );
             },
             AgentEvent::ServerSound(_) | AgentEvent::Hurt => return false,

server/src/sys/msg/character_screen.rs

@@ -12,21 +12,35 @@ use crate::{
 };
 use common::{
     comp::{Admin, AdminRole, ChatType, Player, Presence, Waypoint},
-    event::{EventBus, ServerEvent},
+    event::{
+        ChatEvent, ClientDisconnectEvent, DeleteCharacterEvent, EmitExt, InitializeCharacterEvent,
+        InitializeSpectatorEvent,
+    },
+    event_emitters,
     resources::Time,
     terrain::TerrainChunkSize,
     uid::Uid,
 };
 use common_ecs::{Job, Origin, Phase, System};
 use common_net::msg::{ClientGeneral, ServerGeneral};
-use specs::{Entities, Join, Read, ReadExpect, ReadStorage, WriteExpect, WriteStorage};
+use specs::{Entities, Join, ReadExpect, ReadStorage, WriteExpect, WriteStorage};
 use std::sync::{atomic::Ordering, Arc};
 use tracing::{debug, error};
 
+event_emitters! {
+    struct Events[Emitters] {
+        init_spectator: InitializeSpectatorEvent,
+        init_character_data: InitializeCharacterEvent,
+        delete_character: DeleteCharacterEvent,
+        client_disconnect: ClientDisconnectEvent,
+        chat: ChatEvent,
+    }
+}
+
 impl Sys {
     #[allow(clippy::too_many_arguments)] // Shhhh, go bother someone else clippy
     fn handle_client_character_screen_msg(
-        server_emitter: &mut common::event::Emitter<'_, ServerEvent>,
+        emitters: &mut Emitters,
         entity: specs::Entity,
         client: &Client,
         character_loader: &ReadExpect<'_, CharacterLoader>,
@@ -65,9 +79,7 @@ impl Sys {
 
             if !client.login_msg_sent.load(Ordering::Relaxed) {
                 if let Some(player_uid) = uids.get(entity) {
-                    server_emitter.emit(ServerEvent::Chat(
-                        ChatType::Online(*player_uid).into_plain_msg(""),
-                    ));
+                    emitters.emit(ChatEvent(ChatType::Online(*player_uid).into_plain_msg("")));
 
                     client.login_msg_sent.store(true, Ordering::Relaxed);
                 }
@@ -82,8 +94,7 @@ impl Sys {
                 {
                     send_join_messages()?;
 
-                    server_emitter
-                        .emit(ServerEvent::InitSpectator(entity, requested_view_distances));
+                    emitters.emit(InitializeSpectatorEvent(entity, requested_view_distances));
                 } else {
                     debug!("dropped Spectate msg from unprivileged client")
                 }
@@ -131,7 +142,7 @@ impl Sys {
 
                         // Start inserting non-persisted/default components for the entity
                         // while we load the DB data
-                        server_emitter.emit(ServerEvent::InitCharacterData {
+                        emitters.emit(InitializeCharacterEvent {
                             entity,
                             character_id,
                             requested_view_distances,
@@ -242,7 +253,7 @@ impl Sys {
             },
             ClientGeneral::DeleteCharacter(character_id) => {
                 if let Some(player) = players.get(entity) {
-                    server_emitter.emit(ServerEvent::DeleteCharacter {
+                    emitters.emit(DeleteCharacterEvent {
                         entity,
                         requesting_player_uuid: player.uuid().to_string(),
                         character_id,
@@ -251,7 +262,7 @@ impl Sys {
             },
             _ => {
                 debug!("Kicking possibly misbehaving client due to invalid character request");
-                server_emitter.emit(ServerEvent::ClientDisconnect(
+                emitters.emit(ClientDisconnectEvent(
                     entity,
                     common::comp::DisconnectReason::NetworkError,
                 ));
@@ -267,7 +278,7 @@ pub struct Sys;
 impl<'a> System<'a> for Sys {
     type SystemData = (
         Entities<'a>,
-        Read<'a, EventBus<ServerEvent>>,
+        Events<'a>,
         ReadExpect<'a, CharacterLoader>,
         WriteExpect<'a, CharacterUpdater>,
         ReadStorage<'a, Uid>,
@@ -291,7 +302,7 @@ impl<'a> System<'a> for Sys {
         _job: &mut Job<Self>,
         (
             entities,
-            server_event_bus,
+            events,
             character_loader,
             mut character_updater,
             uids,
@@ -307,12 +318,12 @@ impl<'a> System<'a> for Sys {
             world,
         ): Self::SystemData,
     ) {
-        let mut server_emitter = server_event_bus.emitter();
+        let mut emitters = events.get_emitters();
 
         for (entity, client) in (&entities, &mut clients).join() {
             let _ = super::try_recv_all(client, 1, |client, msg| {
                 Self::handle_client_character_screen_msg(
-                    &mut server_emitter,
+                    &mut emitters,
                     entity,
                     client,
                     &character_loader,

server/src/sys/msg/general.rs

@@ -1,7 +1,8 @@
 use crate::client::Client;
 use common::{
     comp::{ChatMode, ChatType, Content, Group, Player},
-    event::{EventBus, ServerEvent},
+    event::{self, EmitExt},
+    event_emitters,
     resources::ProgramTime,
     uid::Uid,
 };
@@ -11,9 +12,18 @@ use rayon::prelude::*;
 use specs::{Entities, LendJoin, ParJoin, Read, ReadStorage, WriteStorage};
 use tracing::{debug, error, warn};
 
+event_emitters! {
+    struct Events[Emitters] {
+        command: event::CommandEvent,
+        client_disconnect: event::ClientDisconnectEvent,
+        chat: event::ChatEvent,
+
+    }
+}
+
 impl Sys {
     fn handle_general_msg(
-        server_emitter: &mut common::event::Emitter<'_, ServerEvent>,
+        emitters: &mut Emitters,
         entity: specs::Entity,
         client: &Client,
         player: Option<&Player>,
@@ -35,7 +45,7 @@ impl Sys {
                             groups.get(entity).copied(),
                         ) {
                             Ok(message) => {
-                                server_emitter.emit(ServerEvent::Chat(message));
+                                emitters.emit(event::ChatEvent(message));
                             },
                             Err(error) => {
                                 client.send_fallible(ServerGeneral::ChatMsg(
@@ -52,19 +62,19 @@ impl Sys {
             },
             ClientGeneral::Command(name, args) => {
                 if player.is_some() {
-                    server_emitter.emit(ServerEvent::Command(entity, name, args));
+                    emitters.emit(event::CommandEvent(entity, name, args));
                 }
             },
             ClientGeneral::Terminate => {
                 debug!(?entity, "Client send message to terminate session");
-                server_emitter.emit(ServerEvent::ClientDisconnect(
+                emitters.emit(event::ClientDisconnectEvent(
                     entity,
                     common::comp::DisconnectReason::ClientRequested,
                 ));
             },
             _ => {
                 debug!("Kicking possible misbehaving client due to invalid message request");
-                server_emitter.emit(ServerEvent::ClientDisconnect(
+                emitters.emit(event::ClientDisconnectEvent(
                     entity,
                     common::comp::DisconnectReason::NetworkError,
                 ));
@@ -80,7 +90,7 @@ pub struct Sys;
 impl<'a> System<'a> for Sys {
     type SystemData = (
         Entities<'a>,
-        Read<'a, EventBus<ServerEvent>>,
+        Events<'a>,
         Read<'a, ProgramTime>,
         ReadStorage<'a, Uid>,
         ReadStorage<'a, ChatMode>,
@@ -95,16 +105,16 @@ impl<'a> System<'a> for Sys {
 
     fn run(
         _job: &mut Job<Self>,
-        (entities, server_event_bus, program_time, uids, chat_modes, players, groups, mut clients): Self::SystemData,
+        (entities, events, program_time, uids, chat_modes, players, groups, mut clients): Self::SystemData,
     ) {
         (&entities, &mut clients, players.maybe())
             .par_join()
             .for_each_init(
-                || server_event_bus.emitter(),
-                |server_emitter, (entity, client, player)| {
+                || events.get_emitters(),
+                |emitters, (entity, client, player)| {
                     let res = super::try_recv_all(client, 3, |client, msg| {
                         Self::handle_general_msg(
-                            server_emitter,
+                            emitters,
                             entity,
                             client,
                             player,

server/src/sys/msg/in_game.rs

@@ -6,7 +6,8 @@ use common::{
         Admin, AdminRole, CanBuild, ControlEvent, Controller, ForceUpdate, Health, Ori, Player,
         Pos, Presence, PresenceKind, SkillSet, Vel,
     },
-    event::{EventBus, ServerEvent},
+    event::{self, EmitExt},
+    event_emitters,
     link::Is,
     mounting::{Rider, VolumeRider},
     resources::{DeltaTime, PlayerPhysicsSetting, PlayerPhysicsSettings},
@@ -42,10 +43,19 @@ struct RareWrites<'a, 'b> {
     _terrain_persistence: &'b mut TerrainPersistenceData<'a>,
 }
 
+event_emitters! {
+    struct Events[Emitters] {
+        exit_ingame: event::ExitIngameEvent,
+        request_site_info: event::RequestSiteInfoEvent,
+        update_map_marker: event::UpdateMapMarkerEvent,
+        client_disconnect: event::ClientDisconnectEvent,
+    }
+}
+
 impl Sys {
     #[allow(clippy::too_many_arguments)]
     fn handle_client_in_game_msg(
-        server_emitter: &mut common::event::Emitter<'_, ServerEvent>,
+        emitters: &mut Emitters,
         entity: specs::Entity,
         client: &Client,
         maybe_presence: &mut Option<&mut Presence>,
@@ -78,7 +88,7 @@ impl Sys {
         match msg {
             // Go back to registered state (char selection screen)
             ClientGeneral::ExitInGame => {
-                server_emitter.emit(ServerEvent::ExitIngame { entity });
+                emitters.emit(event::ExitIngameEvent { entity });
                 client.send(ServerGeneral::ExitInGameSuccess)?;
                 *maybe_presence = None;
             },
@@ -212,7 +222,7 @@ impl Sys {
                     .transpose();
             },
             ClientGeneral::RequestSiteInfo(id) => {
-                server_emitter.emit(ServerEvent::RequestSiteInfo { entity, id });
+                emitters.emit(event::RequestSiteInfoEvent { entity, id });
             },
             ClientGeneral::RequestPlayerPhysics {
                 server_authoritative,
@@ -227,7 +237,7 @@ impl Sys {
                 presence.lossy_terrain_compression = lossy_terrain_compression;
             },
             ClientGeneral::UpdateMapMarker(update) => {
-                server_emitter.emit(ServerEvent::UpdateMapMarker { entity, update });
+                emitters.emit(event::UpdateMapMarkerEvent { entity, update });
             },
             ClientGeneral::SpectatePosition(pos) => {
                 if let Some(admin) = maybe_admin
@@ -251,7 +261,7 @@ impl Sys {
             | ClientGeneral::Command(..)
             | ClientGeneral::Terminate => {
                 debug!("Kicking possibly misbehaving client due to invalid client in game request");
-                server_emitter.emit(ServerEvent::ClientDisconnect(
+                emitters.emit(event::ClientDisconnectEvent(
                     entity,
                     common::comp::DisconnectReason::NetworkError,
                 ));
@@ -268,7 +278,7 @@ impl<'a> System<'a> for Sys {
     #[allow(clippy::type_complexity)]
     type SystemData = (
         Entities<'a>,
-        Read<'a, EventBus<ServerEvent>>,
+        Events<'a>,
         ReadExpect<'a, TerrainGrid>,
         ReadExpect<'a, SlowJobPool>,
         ReadStorage<'a, CanBuild>,
@@ -301,7 +311,7 @@ impl<'a> System<'a> for Sys {
         _job: &mut Job<Self>,
         (
             entities,
-            server_event_bus,
+            events,
             terrain,
             slow_jobs,
             can_build,
@@ -353,8 +363,8 @@ impl<'a> System<'a> for Sys {
             // NOTE: Required because Specs has very poor work splitting for sparse joins.
             .par_bridge()
             .map_init(
-                || server_event_bus.emitter(),
-                |server_emitter, (
+                || events.get_emitters(),
+                |emitters, (
                     entity,
                     client,
                     mut maybe_presence,
@@ -382,7 +392,7 @@ impl<'a> System<'a> for Sys {
                     let mut player_physics = None;
                     let _ = super::try_recv_all(client, 2, |client, msg| {
                         Self::handle_client_in_game_msg(
-                            server_emitter,
+                            emitters,
                             entity,
                             client,
                             &mut clearable_maybe_presence,

server/src/sys/msg/ping.rs

@@ -1,6 +1,6 @@
 use crate::{client::Client, Settings};
 use common::{
-    event::{EventBus, ServerEvent},
+    event::{ClientDisconnectEvent, EventBus},
     resources::ProgramTime,
 };
 use common_ecs::{Job, Origin, Phase, System};
@@ -25,7 +25,7 @@ pub struct Sys;
 impl<'a> System<'a> for Sys {
     type SystemData = (
         Entities<'a>,
-        Read<'a, EventBus<ServerEvent>>,
+        Read<'a, EventBus<ClientDisconnectEvent>>,
         Read<'a, ProgramTime>,
         WriteStorage<'a, Client>,
         Read<'a, Settings>,
@@ -37,11 +37,11 @@ impl<'a> System<'a> for Sys {
 
     fn run(
         _job: &mut Job<Self>,
-        (entities, server_event_bus, program_time, mut clients, settings): Self::SystemData,
+        (entities, client_disconnect, program_time, mut clients, settings): Self::SystemData,
     ) {
         (&entities, &mut clients).par_join().for_each_init(
-            || server_event_bus.emitter(),
-            |server_emitter, (entity, client)| {
+            || client_disconnect.emitter(),
+            |client_disconnect_emitter, (entity, client)| {
                 // ignore network events
                 while let Some(Ok(Some(_))) =
                     client.participant.as_mut().map(|p| p.try_fetch_event())
@@ -52,7 +52,7 @@ impl<'a> System<'a> for Sys {
                 match res {
                     Err(e) => {
                         debug!(?entity, ?e, "network error with client, disconnecting");
-                        server_emitter.emit(ServerEvent::ClientDisconnect(
+                        client_disconnect_emitter.emit(ClientDisconnectEvent(
                             entity,
                             common::comp::DisconnectReason::NetworkError,
                         ));
@@ -67,7 +67,7 @@ impl<'a> System<'a> for Sys {
                         // Timeout
                         {
                             info!(?entity, "timeout error with client, disconnecting");
-                            server_emitter.emit(ServerEvent::ClientDisconnect(
+                            client_disconnect_emitter.emit(ClientDisconnectEvent(
                                 entity,
                                 common::comp::DisconnectReason::Timeout,
                             ));

server/src/sys/msg/register.rs

@@ -7,7 +7,7 @@ use crate::{
 };
 use common::{
     comp::{self, Admin, Player, Stats},
-    event::{EventBus, ServerEvent},
+    event::{ClientDisconnectEvent, EventBus, MakeAdminEvent},
     recipe::{default_component_recipe_book, default_recipe_book, default_repair_recipe_book},
     resources::TimeOfDay,
     shared_server_config::ServerConstants,
@@ -42,7 +42,8 @@ pub struct ReadData<'a> {
     entities: Entities<'a>,
     stats: ReadStorage<'a, Stats>,
     uids: ReadStorage<'a, Uid>,
-    server_event_bus: Read<'a, EventBus<ServerEvent>>,
+    client_disconnect_events: Read<'a, EventBus<ClientDisconnectEvent>>,
+    make_admin_events: Read<'a, EventBus<MakeAdminEvent>>,
     login_provider: ReadExpect<'a, LoginProvider>,
     player_metrics: ReadExpect<'a, PlayerMetrics>,
     settings: ReadExpect<'a, Settings>,
@@ -62,7 +63,6 @@ pub struct ReadData<'a> {
 pub struct Sys;
 impl<'a> System<'a> for Sys {
     type SystemData = (
-        Read<'a, EventBus<ServerEvent>>,
         ReadData<'a>,
         WriteStorage<'a, Client>,
         WriteStorage<'a, Player>,
@@ -75,8 +75,9 @@ impl<'a> System<'a> for Sys {
 
     fn run(
         _job: &mut Job<Self>,
-        (event_bus, read_data, mut clients, mut players, mut pending_logins): Self::SystemData,
+        (read_data, mut clients, mut players, mut pending_logins): Self::SystemData,
     ) {
+        let mut make_admin_emitter = read_data.make_admin_events.emitter();
         // Player list to send new players, and lookup from UUID to entity (so we don't
         // have to do a linear scan over all entities on each login to see if
         // it's a duplicate).
@@ -165,8 +166,8 @@ impl<'a> System<'a> for Sys {
             // NOTE: Required because Specs has very poor work splitting for sparse joins.
             .par_bridge()
             .for_each_init(
-                || read_data.server_event_bus.emitter(),
-                |server_emitter, (entity, uid, client, _, pending)| {
+                || read_data.client_disconnect_events.emitter(),
+                |client_disconnect_emitter, (entity, uid, client, _, pending)| {
                     prof_span!("msg::register login");
                     if let Err(e) = || -> Result<(), crate::error::Error> {
                         let extra_checks = |username: String, uuid: authc::Uuid| {
@@ -238,7 +239,7 @@ impl<'a> System<'a> for Sys {
                                         // NOTE: Done only on error to avoid doing extra work within
                                         // the lock.
                                         trace!(?e, "pending login returned error");
-                                        server_emitter.emit(ServerEvent::ClientDisconnect(
+                                        client_disconnect_emitter.emit(ClientDisconnectEvent(
                                             entity,
                                             common::comp::DisconnectReason::Kicked,
                                         ));
@@ -302,7 +303,7 @@ impl<'a> System<'a> for Sys {
                                     );
                                 }
                                 // Remove old client
-                                server_emitter.emit(ServerEvent::ClientDisconnect(
+                                client_disconnect_emitter.emit(ClientDisconnectEvent(
                                     old_entity,
                                     common::comp::DisconnectReason::NewerLogin,
                                 ));
@@ -408,7 +409,7 @@ impl<'a> System<'a> for Sys {
                 if let Some(admin) = admin {
                     // We need to defer writing to the Admin storage since it's borrowed immutably
                     // by this system via TrackedStorages.
-                    event_bus.emit_now(ServerEvent::MakeAdmin {
+                    make_admin_emitter.emit(MakeAdminEvent {
                         entity,
                         admin: Admin(admin.role.into()),
                         uuid,

server/src/sys/msg/terrain.rs

@@ -4,7 +4,7 @@ use crate::{
 };
 use common::{
     comp::{Pos, Presence},
-    event::{EventBus, ServerEvent},
+    event::{ClientDisconnectEvent, EventBus},
     spiral::Spiral2d,
     terrain::{CoordinateConversions, TerrainChunkSize, TerrainGrid},
     vol::RectVolSize,
@@ -21,7 +21,7 @@ pub struct Sys;
 impl<'a> System<'a> for Sys {
     type SystemData = (
         Entities<'a>,
-        Read<'a, EventBus<ServerEvent>>,
+        Read<'a, EventBus<ClientDisconnectEvent>>,
         ReadExpect<'a, EventBus<ChunkSendEntry>>,
         ReadExpect<'a, TerrainGrid>,
         ReadExpect<'a, Lod>,
@@ -40,7 +40,7 @@ impl<'a> System<'a> for Sys {
         job: &mut Job<Self>,
         (
             entities,
-            server_event_bus,
+            client_disconnect_events,
             chunk_send_bus,
             terrain,
             lod,
@@ -57,8 +57,8 @@ impl<'a> System<'a> for Sys {
             // NOTE: Required because Specs has very poor work splitting for sparse joins.
             .par_bridge()
             .map_init(
-                || (chunk_send_bus.emitter(), server_event_bus.emitter()),
-                |(chunk_send_emitter, server_emitter), (entity, client, maybe_presence)| {
+                || (chunk_send_bus.emitter(), client_disconnect_events.emitter()),
+                |(chunk_send_emitter, client_disconnect_emitter), (entity, client, maybe_presence)| {
                     let mut chunk_requests = Vec::new();
                     let _ = super::try_recv_all(client, 5, |client, msg| {
                         // SPECIAL CASE: LOD zone requests can be sent by non-present players
@@ -112,7 +112,7 @@ impl<'a> System<'a> for Sys {
                                         "Kicking possibly misbehaving client due to invalud terrain \
                                          request"
                                     );
-                                    server_emitter.emit(ServerEvent::ClientDisconnect(
+                                    client_disconnect_emitter.emit(ClientDisconnectEvent(
                                         entity,
                                         common::comp::DisconnectReason::NetworkError,
                                     ));

server/src/sys/object.rs

@@ -2,7 +2,8 @@ use common::{
     comp::{object, Body, Object, PhysicsState, Pos, Teleporting, Vel},
     consts::TELEPORTER_RADIUS,
     effect::Effect,
-    event::{EventBus, ServerEvent},
+    event::{ChangeBodyEvent, DeleteEvent, EmitExt, EventBus, ExplosionEvent, ShootEvent},
+    event_emitters,
     outcome::Outcome,
     resources::{DeltaTime, Time},
     CachedSpatialGrid, Damage, DamageKind, DamageSource, Explosion, RadiusEffect,
@@ -11,15 +12,24 @@ use common_ecs::{Job, Origin, Phase, System};
 use specs::{Entities, Join, LendJoin, Read, ReadStorage};
 use vek::Rgb;
 
+event_emitters! {
+    struct Events[Emitters] {
+        delete: DeleteEvent,
+        explosion: ExplosionEvent,
+        shoot: ShootEvent,
+        change_body: ChangeBodyEvent,
+    }
+}
+
 /// This system is responsible for handling misc object behaviours
 #[derive(Default)]
 pub struct Sys;
 impl<'a> System<'a> for Sys {
     type SystemData = (
         Entities<'a>,
+        Events<'a>,
         Read<'a, DeltaTime>,
         Read<'a, Time>,
-        Read<'a, EventBus<ServerEvent>>,
         Read<'a, EventBus<Outcome>>,
         Read<'a, CachedSpatialGrid>,
         ReadStorage<'a, Pos>,
@@ -38,9 +48,9 @@ impl<'a> System<'a> for Sys {
         _job: &mut Job<Self>,
         (
             entities,
+            events,
             _dt,
             time,
-            server_bus,
             outcome_bus,
             spatial_grid,
             positions,
@@ -51,7 +61,7 @@ impl<'a> System<'a> for Sys {
             teleporting,
         ): Self::SystemData,
     ) {
-        let mut server_emitter = server_bus.emitter();
+        let mut emitters = events.get_emitters();
 
         // Objects
         for (entity, pos, vel, physics, object, body) in (
@@ -67,8 +77,8 @@ impl<'a> System<'a> for Sys {
             match object {
                 Object::Bomb { owner } => {
                     if physics.on_surface().is_some() {
-                        server_emitter.emit(ServerEvent::Delete(entity));
-                        server_emitter.emit(ServerEvent::Explosion {
+                        emitters.emit(DeleteEvent(entity));
+                        emitters.emit(ExplosionEvent {
                             pos: pos.0,
                             explosion: Explosion {
                                 effects: vec![
@@ -132,7 +142,7 @@ impl<'a> System<'a> for Sys {
                                     phi.sin(),
                                 ))
                                 .expect("nonzero vector should normalize");
-                                server_emitter.emit(ServerEvent::Shoot {
+                                emitters.emit(ShootEvent {
                                     entity,
                                     pos: *pos,
                                     dir,
@@ -160,8 +170,8 @@ impl<'a> System<'a> for Sys {
                                 });
                             }
                         }
-                        server_emitter.emit(ServerEvent::Delete(entity));
-                        server_emitter.emit(ServerEvent::Explosion {
+                        emitters.emit(DeleteEvent(entity));
+                        emitters.emit(ExplosionEvent {
                             pos: pos.0,
                             explosion: Explosion {
                                 effects: vec![
@@ -186,7 +196,7 @@ impl<'a> System<'a> for Sys {
                     timeout,
                 } => {
                     if (time.0 - spawned_at.0).max(0.0) > timeout.as_secs_f64() {
-                        server_emitter.emit(ServerEvent::Delete(entity));
+                        emitters.emit(DeleteEvent(entity));
                     }
                 },
                 Object::Portal { .. } => {
@@ -204,7 +214,7 @@ impl<'a> System<'a> for Sys {
                         });
 
                     if (*body == Body::Object(object::Body::PortalActive)) != is_active {
-                        server_bus.emit_now(ServerEvent::ChangeBody {
+                        emitters.emit(ChangeBodyEvent {
                             entity,
                             new_body: Body::Object(if is_active {
                                 outcome_bus.emit_now(Outcome::PortalActivated { pos: pos.0 });

server/src/sys/teleporter.rs

@@ -1,7 +1,7 @@
 use common::{
     comp::{Agent, Alignment, CharacterState, Object, Pos, Teleporting},
     consts::TELEPORTER_RADIUS,
-    event::{EventBus, ServerEvent},
+    event::{EventBus, TeleportToPositionEvent},
     outcome::Outcome,
     resources::Time,
     uid::Uid,
@@ -33,7 +33,7 @@ impl<'a> System<'a> for Sys {
         ReadStorage<'a, CharacterState>,
         Read<'a, CachedSpatialGrid>,
         Read<'a, Time>,
-        Read<'a, EventBus<ServerEvent>>,
+        Read<'a, EventBus<TeleportToPositionEvent>>,
         Read<'a, EventBus<Outcome>>,
     );
 
@@ -54,10 +54,12 @@ impl<'a> System<'a> for Sys {
             character_states,
             spatial_grid,
             time,
-            server_bus,
+            teleport_to_position_events,
             outcome_bus,
         ): Self::SystemData,
     ) {
+        let mut teleport_to_position_emitter = teleport_to_position_events.emitter();
+        let mut outcome_emitter = outcome_bus.emitter();
         let check_aggro = |entity, pos: Vec3<f32>| {
             spatial_grid
                 .0
@@ -126,11 +128,11 @@ impl<'a> System<'a> for Sys {
 
                 for entity in nearby {
                     cancel_teleporting.push(entity);
-                    server_bus.emit_now(ServerEvent::TeleportToPosition {
+                    teleport_to_position_emitter.emit(TeleportToPositionEvent {
                         entity,
                         position: *target,
                     });
-                    outcome_bus.emit_now(Outcome::TeleportedByPortal { pos: *target });
+                    outcome_emitter.emit(Outcome::TeleportedByPortal { pos: *target });
                 }
             }
         }

server/src/sys/terrain.rs

@@ -15,7 +15,10 @@ use common::{
         self, agent, biped_small, bird_medium, misc::PortalData, skillset::skills,
         BehaviorCapability, ForceUpdate, Pos, Presence, Waypoint,
     },
-    event::{EventBus, NpcBuilder, ServerEvent},
+    event::{
+        CreateNpcEvent, CreateTeleporterEvent, CreateWaypointEvent, EmitExt, EventBus, NpcBuilder,
+    },
+    event_emitters,
     generation::{EntityInfo, SpecialEntity},
     lottery::LootSpec,
     resources::{Time, TimeOfDay},
@@ -51,6 +54,14 @@ type RtSimData<'a> = WriteExpect<'a, rtsim::RtSim>;
 #[cfg(not(feature = "worldgen"))]
 type RtSimData<'a> = ();
 
+event_emitters! {
+    struct Events[Emitters] {
+        create_npc: CreateNpcEvent,
+        create_waypoint: CreateWaypointEvent,
+        create_teleporter: CreateTeleporterEvent,
+    }
+}
+
 /// This system will handle loading generated chunks and unloading
 /// unneeded chunks.
 ///     1. Inserts newly generated chunks into the TerrainGrid
@@ -62,7 +73,7 @@ pub struct Sys;
 impl<'a> System<'a> for Sys {
     #[allow(clippy::type_complexity)]
     type SystemData = (
-        Read<'a, EventBus<ServerEvent>>,
+        Events<'a>,
         Read<'a, Tick>,
         Read<'a, Settings>,
         Read<'a, TimeOfDay>,
@@ -94,7 +105,7 @@ impl<'a> System<'a> for Sys {
     fn run(
         _job: &mut Job<Self>,
         (
-            server_event_bus,
+            events,
             tick,
             server_settings,
             time_of_day,
@@ -119,7 +130,7 @@ impl<'a> System<'a> for Sys {
             time,
         ): Self::SystemData,
     ) {
-        let mut server_emitter = server_event_bus.emitter();
+        let mut emitters = events.get_emitters();
 
         // Generate requested chunks
         //
@@ -196,7 +207,7 @@ impl<'a> System<'a> for Sys {
                 let data = NpcData::from_entity_info(entity);
                 match data {
                     NpcData::Waypoint(pos) => {
-                        server_emitter.emit(ServerEvent::CreateWaypoint(pos));
+                        emitters.emit(CreateWaypointEvent(pos));
                     },
                     NpcData::Data {
                         pos,
@@ -211,7 +222,7 @@ impl<'a> System<'a> for Sys {
                         scale,
                         loot,
                     } => {
-                        server_emitter.emit(ServerEvent::CreateNpc {
+                        emitters.emit(CreateNpcEvent {
                             pos,
                             ori: comp::Ori::from(Dir::random_2d(&mut rng)),
                             npc: NpcBuilder::new(stats, body, alignment)
@@ -227,7 +238,7 @@ impl<'a> System<'a> for Sys {
                         });
                     },
                     NpcData::Teleporter(pos, teleporter) => {
-                        server_emitter.emit(ServerEvent::CreateTeleporter(pos, teleporter));
+                        emitters.emit(CreateTeleporterEvent(pos, teleporter));
                     },
                 }
             }

server/src/sys/wiring.rs

@@ -1,7 +1,7 @@
 use crate::wiring::{Circuit, WiringElement};
 use common::{
     comp::{LightEmitter, PhysicsState, Pos},
-    event::{EventBus, ServerEvent},
+    event, event_emitters,
     resources::EntitiesDiedLastTick,
 };
 use common_ecs::{Job, Origin, Phase, System};
@@ -20,13 +20,19 @@ pub struct ReadData<'a> {
     entities_died_last_tick: Read<'a, EntitiesDiedLastTick>,
 }
 
+event_emitters! {
+    struct Events[Emitters] {
+        shoot: event::ShootEvent,
+    }
+}
+
 /// This system is responsible for handling wiring (signals and wiring systems)
 #[derive(Default)]
 pub struct Sys;
 impl<'a> System<'a> for Sys {
     type SystemData = (
         ReadData<'a>,
-        Read<'a, EventBus<ServerEvent>>,
+        Events<'a>,
         WriteStorage<'a, WiringElement>,
         WriteStorage<'a, LightEmitter>, // maybe
         Write<'a, BlockChange>,
@@ -38,9 +44,9 @@ impl<'a> System<'a> for Sys {
 
     fn run(
         _job: &mut Job<Self>,
-        (read_data, event_bus, mut wiring_elements, mut light_emitters, mut block_change): Self::SystemData,
+        (read_data, events, mut wiring_elements, mut light_emitters, mut block_change): Self::SystemData,
     ) {
-        let mut server_emitter = event_bus.emitter();
+        let mut emitters = events.get_emitters();
 
         // Compute the output for each wiring element by computing
         // the output for each `OutputFormula` and store each value per output per
@@ -128,7 +134,7 @@ impl<'a> System<'a> for Sys {
                                 &wiring_element.inputs,
                                 physics_state,
                                 &read_data.entities_died_last_tick.0,
-                                &mut server_emitter,
+                                &mut emitters,
                                 pos,
                                 &mut block_change,
                                 light_emitter.as_deref_mut(),

server/src/wiring.rs

@@ -1,6 +1,6 @@
 use common::{
     comp::{item::tool, object, Body, LightEmitter, PhysicsState, Pos, ProjectileConstructor},
-    event::{Emitter, ServerEvent},
+    event::{EmitExt, ShootEvent},
     terrain::{Block, TerrainChunkSize},
     util::Dir,
     vol::RectVolSize,
@@ -162,7 +162,7 @@ impl WiringAction {
         inputs: &HashMap<String, f32>,
         physics_state: Option<&PhysicsState>,
         entities_died_last_tick: &Vec<(Entity, Pos)>,
-        server_emitter: &mut Emitter<'_, ServerEvent>,
+        emitters: &mut impl EmitExt<ShootEvent>,
         pos: Option<&Pos>,
         block_change: &mut BlockChange,
         mut light_emitter: Option<&mut LightEmitter>,
@@ -183,7 +183,7 @@ impl WiringAction {
                 },
                 WiringActionEffect::SpawnProjectile { constr } => {
                     if let Some(&pos) = pos {
-                        server_emitter.emit(ServerEvent::Shoot {
+                        emitters.emit(ShootEvent {
                             entity,
                             pos,
                             dir: Dir::forward(),