diff --git a/.idea/appflowy_client.iml b/.idea/appflowy_client.iml
index 94f61ad366..42434a43ef 100644
--- a/.idea/appflowy_client.iml
+++ b/.idea/appflowy_client.iml
@@ -10,6 +10,7 @@
       <sourceFolder url="file://$MODULE_DIR$/rust-lib/dart-ffi/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/rust-lib/flowy-log/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/rust-lib/flowy-sdk/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/rust-lib/flowy-user/src" isTestSource="false" />
       <excludeFolder url="file://$MODULE_DIR$/app_flowy/packages/af_protobuf/.pub" />
       <excludeFolder url="file://$MODULE_DIR$/app_flowy/packages/af_protobuf/.dart_tool" />
       <excludeFolder url="file://$MODULE_DIR$/app_flowy/packages/af_protobuf/build" />
diff --git a/rust-lib/Cargo.toml b/rust-lib/Cargo.toml
index 3424af727f..b2d90e77fb 100644
--- a/rust-lib/Cargo.toml
+++ b/rust-lib/Cargo.toml
@@ -4,6 +4,7 @@ members = [
   "flowy-sdk",
   "dart-ffi",
   "flowy-log",
+  "flowy-user",
 ]
 
 [profile.dev]
diff --git a/rust-lib/flowy-log/src/lib.rs b/rust-lib/flowy-log/src/lib.rs
index d402821c00..af26c09d0a 100644
--- a/rust-lib/flowy-log/src/lib.rs
+++ b/rust-lib/flowy-log/src/lib.rs
@@ -1,10 +1,9 @@
-use log::SetLoggerError;
 use tracing::subscriber::set_global_default;
 use tracing_bunyan_formatter::{BunyanFormattingLayer, JsonStorageLayer};
 use tracing_log::LogTracer;
 use tracing_subscriber::{layer::SubscriberExt, EnvFilter};
 
-pub fn init_log(name: &str, env_filter: &str) -> std::Result<(), SetLoggerError> {
+pub fn init_log(name: &str, env_filter: &str) -> std::result::Result<(), String> {
     let env_filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(env_filter.to_owned()));
     let formatting_layer = BunyanFormattingLayer::new(name.to_owned(), std::io::stdout);
     let subscriber = tracing_subscriber::fmt()
@@ -17,8 +16,8 @@ pub fn init_log(name: &str, env_filter: &str) -> std::Result<(), SetLoggerError>
         .with(JsonStorageLayer)
         .with(formatting_layer);
 
-    let _ = LogTracer::init()?;
-    let _ = set_global_default(subscriber)?;
+    let _ = LogTracer::init().map_err(|e| format!("{:?}", e))?;
+    let _ = set_global_default(subscriber).map_err(|e| format!("{:?}", e))?;
     Ok(())
 }
 
@@ -28,7 +27,7 @@ mod tests {
 
     #[test]
     fn test_log() {
-        init_log("flowy-log", "info");
+        init_log("flowy-log", "info").unwrap();
         tracing::info!("😁 Tracing info log");
         log::info!("😁 bridge 'log' to 'tracing'");
     }
diff --git a/rust-lib/flowy-sdk/Cargo.toml b/rust-lib/flowy-sdk/Cargo.toml
index 197f6ed2d6..a4576af753 100644
--- a/rust-lib/flowy-sdk/Cargo.toml
+++ b/rust-lib/flowy-sdk/Cargo.toml
@@ -6,4 +6,5 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-flowy-sys = { path = "../flowy-sys" }
\ No newline at end of file
+flowy-sys = { path = "../flowy-sys" }
+flowy-log = { path = "../flowy-log" }
\ No newline at end of file
diff --git a/rust-lib/flowy-sys/src/module/module.rs b/rust-lib/flowy-sys/src/module/module.rs
index 01bad43ae8..4f2b57fd43 100644
--- a/rust-lib/flowy-sys/src/module/module.rs
+++ b/rust-lib/flowy-sys/src/module/module.rs
@@ -17,14 +17,22 @@ use futures_core::{future::LocalBoxFuture, ready};
 use pin_project::pin_project;
 use std::{
     collections::HashMap,
+    fmt::{Debug, Display},
     future::Future,
+    hash::Hash,
     pin::Pin,
     rc::Rc,
     task::{Context, Poll},
 };
 use tokio::sync::mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender};
 
-pub type Event = String;
+#[derive(PartialEq, Eq, Hash, Debug, Clone)]
+pub struct Event(String);
+
+impl<T: Display + Eq + Hash + Debug + Clone> std::convert::From<T> for Event {
+    fn from(t: T) -> Self { Event(format!("{}", t)) }
+}
+
 pub type EventServiceFactory = BoxServiceFactory<(), ServiceRequest, ServiceResponse, SystemError>;
 
 pub struct Module {
@@ -57,15 +65,17 @@ impl Module {
         self
     }
 
-    pub fn event<H, T, R>(mut self, event: Event, handler: H) -> Self
+    pub fn event<E, H, T, R>(mut self, event: E, handler: H) -> Self
     where
         H: Handler<T, R>,
         T: FromRequest + 'static,
         R: Future + 'static,
         R::Output: Responder + 'static,
+        E: Eq + Hash + Debug + Clone + Display,
     {
+        let event: Event = event.into();
         if self.service_map.contains_key(&event) {
-            log::error!("Duplicate Event: {}", &event);
+            log::error!("Duplicate Event: {:?}", &event);
         }
 
         Rc::get_mut(&mut self.service_map)
diff --git a/rust-lib/flowy-sys/src/request/request.rs b/rust-lib/flowy-sys/src/request/request.rs
index 12aafd415a..68b7800c02 100644
--- a/rust-lib/flowy-sys/src/request/request.rs
+++ b/rust-lib/flowy-sys/src/request/request.rs
@@ -2,22 +2,30 @@ use std::future::Future;
 
 use crate::{
     error::SystemError,
+    module::Event,
     request::payload::Payload,
     util::ready::{ready, Ready},
 };
+use std::{
+    fmt::{Debug, Display},
+    hash::Hash,
+};
 
 #[derive(Clone, Debug)]
 pub struct EventRequest {
     id: String,
-    event: String,
+    event: Event,
     data: Option<Vec<u8>>,
 }
 
 impl EventRequest {
-    pub fn new(event: String) -> EventRequest {
+    pub fn new<E>(event: E) -> EventRequest
+    where
+        E: Eq + Hash + Debug + Clone + Display,
+    {
         Self {
             id: uuid::Uuid::new_v4().to_string(),
-            event,
+            event: event.into(),
             data: None,
         }
     }
@@ -27,7 +35,7 @@ impl EventRequest {
         self
     }
 
-    pub fn get_event(&self) -> &str { &self.event }
+    pub fn get_event(&self) -> &Event { &self.event }
 
     pub fn get_id(&self) -> &str { &self.id }
 
diff --git a/rust-lib/flowy-sys/src/response/data.rs b/rust-lib/flowy-sys/src/response/data.rs
index 4be2edd98f..7602701166 100644
--- a/rust-lib/flowy-sys/src/response/data.rs
+++ b/rust-lib/flowy-sys/src/response/data.rs
@@ -1,3 +1,4 @@
+use bytes::{Buf, Bytes};
 use serde::{Deserialize, Serialize};
 use std::{fmt, fmt::Formatter};
 
@@ -20,6 +21,14 @@ impl std::convert::Into<ResponseData> for String {
     fn into(self) -> ResponseData { ResponseData::Bytes(self.into_bytes()) }
 }
 
+impl std::convert::Into<ResponseData> for &'_ String {
+    fn into(self) -> ResponseData { ResponseData::Bytes(self.to_owned().into_bytes()) }
+}
+
+impl std::convert::Into<ResponseData> for Bytes {
+    fn into(self) -> ResponseData { ResponseData::Bytes(self.bytes().to_vec()) }
+}
+
 impl std::convert::Into<ResponseData> for &str {
     fn into(self) -> ResponseData { self.to_string().into() }
 }
diff --git a/rust-lib/flowy-sys/src/response/responder.rs b/rust-lib/flowy-sys/src/response/responder.rs
index 98d4a261c6..03348d4e95 100644
--- a/rust-lib/flowy-sys/src/response/responder.rs
+++ b/rust-lib/flowy-sys/src/response/responder.rs
@@ -1,7 +1,9 @@
 use crate::{
+    error::SystemError,
     request::EventRequest,
     response::{EventResponse, EventResponseBuilder},
 };
+use bytes::Bytes;
 
 pub trait Responder {
     fn respond_to(self, req: &EventRequest) -> EventResponse;
@@ -17,3 +19,18 @@ macro_rules! impl_responder {
 
 impl_responder!(&'static str);
 impl_responder!(String);
+impl_responder!(&'_ String);
+impl_responder!(Bytes);
+
+impl<T, E> Responder for Result<T, E>
+where
+    T: Responder,
+    E: Into<SystemError>,
+{
+    fn respond_to(self, request: &EventRequest) -> EventResponse {
+        match self {
+            Ok(val) => val.respond_to(request),
+            Err(e) => e.into().into(),
+        }
+    }
+}
diff --git a/rust-lib/flowy-sys/src/stream.rs b/rust-lib/flowy-sys/src/stream.rs
index 91c6cc515c..56cbf2ce55 100644
--- a/rust-lib/flowy-sys/src/stream.rs
+++ b/rust-lib/flowy-sys/src/stream.rs
@@ -6,7 +6,7 @@ use crate::{
     system::ModuleMap,
 };
 use futures_core::{future::LocalBoxFuture, ready, task::Context};
-use std::future::Future;
+use std::{future::Future, hash::Hash};
 use tokio::{
     macros::support::{Pin, Poll},
     sync::mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender},
@@ -38,7 +38,10 @@ struct CommandSenderService {
     module_map: ModuleMap,
 }
 
-impl<T: 'static> Service<CommandData<T>> for CommandSenderService {
+impl<T> Service<CommandData<T>> for CommandSenderService
+where
+    T: 'static,
+{
     type Response = EventResponse;
     type Error = SystemError;
     type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;
@@ -109,7 +112,10 @@ where
 
 service_factor_impl!(CommandSender);
 
-impl<T> CommandSender<T> {
+impl<T> CommandSender<T>
+where
+    T: 'static,
+{
     pub fn new(module_map: ModuleMap) -> Self {
         let (data_tx, data_rx) = unbounded_channel::<CommandData<T>>();
         Self {
@@ -135,14 +141,20 @@ impl<T> CommandSender<T> {
     pub fn take_data_rx(&mut self) -> UnboundedReceiver<CommandData<T>> { self.data_rx.take().unwrap() }
 }
 
-pub struct CommandSenderRunner<T: 'static> {
+pub struct CommandSenderRunner<T>
+where
+    T: 'static,
+{
     module_map: ModuleMap,
     data_rx: UnboundedReceiver<CommandData<T>>,
 }
 
 service_factor_impl!(CommandSenderRunner);
 
-impl<T: 'static> CommandSenderRunner<T> {
+impl<T> CommandSenderRunner<T>
+where
+    T: 'static,
+{
     pub fn new(module_map: ModuleMap, data_rx: UnboundedReceiver<CommandData<T>>) -> Self {
         Self { module_map, data_rx }
     }
diff --git a/rust-lib/flowy-sys/src/system.rs b/rust-lib/flowy-sys/src/system.rs
index 2db8c18fd6..d300aaac84 100644
--- a/rust-lib/flowy-sys/src/system.rs
+++ b/rust-lib/flowy-sys/src/system.rs
@@ -4,7 +4,7 @@ use crate::{
     stream::CommandSenderRunner,
 };
 use futures_core::{ready, task::Context};
-use std::{cell::RefCell, collections::HashMap, future::Future, io, rc::Rc, sync::Arc};
+use std::{cell::RefCell, collections::HashMap, fmt::Debug, future::Future, io, rc::Rc, sync::Arc};
 use tokio::{
     macros::support::{Pin, Poll},
     sync::{
@@ -30,6 +30,7 @@ pub struct FlowySystem {
 impl FlowySystem {
     pub fn construct<F, S, T>(module_factory: F, sender_factory: S) -> SystemRunner
     where
+        // E: Into<Event<E>> + Eq + Hash + Debug + Clone + 'static,
         F: FnOnce() -> Vec<Module>,
         S: FnOnce(ModuleMap) -> CommandSenderRunner<T>,
         T: 'static,
diff --git a/rust-lib/flowy-sys/tests/api/helper.rs b/rust-lib/flowy-sys/tests/api/helper.rs
index d8c43c976d..3b9ea955ce 100644
--- a/rust-lib/flowy-sys/tests/api/helper.rs
+++ b/rust-lib/flowy-sys/tests/api/helper.rs
@@ -1,9 +1,5 @@
 use flowy_sys::prelude::{CommandData, CommandSender, CommandSenderRunner, EventResponse, FlowySystem, Module};
-use std::{
-    cell::RefCell,
-    sync::{Once, RwLock},
-    task::Context,
-};
+use std::{cell::RefCell, sync::Once};
 
 #[allow(dead_code)]
 pub fn setup_env() {
diff --git a/rust-lib/flowy-sys/tests/api/main.rs b/rust-lib/flowy-sys/tests/api/main.rs
index 21ac62726e..6147b588f8 100644
--- a/rust-lib/flowy-sys/tests/api/main.rs
+++ b/rust-lib/flowy-sys/tests/api/main.rs
@@ -1,2 +1,2 @@
 mod helper;
-mod module_event;
+mod module;
diff --git a/rust-lib/flowy-sys/tests/api/module.rs b/rust-lib/flowy-sys/tests/api/module.rs
new file mode 100644
index 0000000000..e7095b6809
--- /dev/null
+++ b/rust-lib/flowy-sys/tests/api/module.rs
@@ -0,0 +1,23 @@
+use crate::helper::*;
+use flowy_sys::prelude::*;
+
+pub async fn hello() -> String { "say hello".to_string() }
+#[test]
+fn test_init() {
+    setup_env();
+
+    let event = "1";
+    let modules = vec![Module::new().event(event, hello)];
+
+    init_system(modules, move || {
+        let request = EventRequest::new(event);
+        let stream_data = CommandData::new(1, Some(request)).with_callback(Box::new(|_config, response| {
+            log::info!("async resp: {:?}", response);
+        }));
+
+        let resp = sync_send(stream_data);
+        log::info!("sync resp: {:?}", resp);
+
+        stop_system();
+    });
+}
diff --git a/rust-lib/flowy-sys/tests/api/module_event.rs b/rust-lib/flowy-sys/tests/api/module_event.rs
deleted file mode 100644
index 5cf14a570a..0000000000
--- a/rust-lib/flowy-sys/tests/api/module_event.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-use crate::helper::*;
-use flowy_sys::prelude::*;
-
-pub async fn no_params() -> String { "no params function call".to_string() }
-pub async fn one_params(_s: String) -> String { "one params function call".to_string() }
-pub async fn two_params(_s1: String, _s2: String) -> String { "two params function call".to_string() }
-
-#[test]
-fn test_init() {
-    setup_env();
-
-    let no_params_command = "no params".to_string();
-    let one_params_command = "one params".to_string();
-    let two_params_command = "two params".to_string();
-
-    let modules = vec![Module::new()
-        .event(no_params_command.clone(), no_params)
-        .event(one_params_command.clone(), one_params)
-        .event(two_params_command.clone(), two_params)];
-
-    init_system(modules, || {
-        let request = EventRequest::new(no_params_command);
-        let stream_data = CommandData::new(1, Some(request)).with_callback(Box::new(|_config, response| {
-            log::info!("async resp: {:?}", response);
-        }));
-
-        let resp = sync_send(stream_data);
-        log::info!("sync resp: {:?}", resp);
-
-        stop_system();
-    });
-}
diff --git a/rust-lib/flowy-user/Cargo.toml b/rust-lib/flowy-user/Cargo.toml
new file mode 100644
index 0000000000..ce7ed6966d
--- /dev/null
+++ b/rust-lib/flowy-user/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "flowy-user"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+derive_more = {version = "0.99", features = ["display"]}
+flowy-sys = { path = "../flowy-sys" }
+flowy-log = { path = "../flowy-log" }
\ No newline at end of file
diff --git a/rust-lib/flowy-user/src/error.rs b/rust-lib/flowy-user/src/error.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/rust-lib/flowy-user/src/error.rs
@@ -0,0 +1 @@
+
diff --git a/rust-lib/flowy-user/src/event.rs b/rust-lib/flowy-user/src/event.rs
new file mode 100644
index 0000000000..230dfe94e1
--- /dev/null
+++ b/rust-lib/flowy-user/src/event.rs
@@ -0,0 +1,10 @@
+use derive_more::Display;
+
+#[derive(Clone, Copy, PartialEq, Eq, Debug, Display, Hash)]
+pub enum UserEvent {
+    #[display(fmt = "AuthCheck")]
+    AuthCheck = 0,
+    SignIn    = 1,
+    SignUp    = 2,
+    SignOut   = 3,
+}
diff --git a/rust-lib/flowy-user/src/handlers/auth.rs b/rust-lib/flowy-user/src/handlers/auth.rs
new file mode 100644
index 0000000000..50b2b55ab7
--- /dev/null
+++ b/rust-lib/flowy-user/src/handlers/auth.rs
@@ -0,0 +1,2 @@
+// #[tracing::instrument(name = "Adding a new subscriber")]
+pub async fn user_check() -> String { "".to_owned() }
diff --git a/rust-lib/flowy-user/src/handlers/mod.rs b/rust-lib/flowy-user/src/handlers/mod.rs
new file mode 100644
index 0000000000..ca51de07ab
--- /dev/null
+++ b/rust-lib/flowy-user/src/handlers/mod.rs
@@ -0,0 +1,3 @@
+mod auth;
+
+pub use auth::*;
diff --git a/rust-lib/flowy-user/src/lib.rs b/rust-lib/flowy-user/src/lib.rs
new file mode 100644
index 0000000000..41ae48f870
--- /dev/null
+++ b/rust-lib/flowy-user/src/lib.rs
@@ -0,0 +1,4 @@
+mod error;
+mod event;
+mod handlers;
+pub mod module;
diff --git a/rust-lib/flowy-user/src/module.rs b/rust-lib/flowy-user/src/module.rs
new file mode 100644
index 0000000000..22f6d05e2f
--- /dev/null
+++ b/rust-lib/flowy-user/src/module.rs
@@ -0,0 +1,10 @@
+use crate::{event::UserEvent::*, handlers::*};
+use flowy_sys::prelude::*;
+
+pub fn create() -> Module {
+    Module::new()
+        .event(AuthCheck, user_check)
+        .event(SignIn, user_check)
+        .event(SignUp, user_check)
+        .event(SignOut, user_check)
+}