From 3cd48ba4681c9c2a9ff80ff1439c4676f10922d0 Mon Sep 17 00:00:00 2001
From: Joshua Barretto <joshua.s.barretto@gmail.com>
Date: Wed, 1 May 2019 10:22:48 +0100
Subject: [PATCH] Added lz4 compression to networking

Former-commit-id: 7910c933f110d595da70552716b6e8f0eb7544a1
---
 Cargo.lock              |  17 ++
 client/Cargo.lock       | 586 ++++++++++++++++++++++++++++++++++++++++
 client/src/lib.rs       |   6 +-
 common/Cargo.toml       |   1 +
 common/src/net/post2.rs |   7 +-
 common/src/sys/phys.rs  |   2 +-
 server/src/lib.rs       |   2 +-
 7 files changed, 614 insertions(+), 7 deletions(-)
 create mode 100644 client/Cargo.lock

diff --git a/Cargo.lock b/Cargo.lock
index 6419e24a3b..a4a7395b05 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -162,6 +162,11 @@ name = "block"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "byteorder"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
 version = "1.3.1"
@@ -1170,6 +1175,15 @@ dependencies = [
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "lz4-compress"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "lzw"
 version = "0.10.0"
@@ -2288,6 +2302,7 @@ dependencies = [
  "image 0.21.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lz4-compress 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-extras 2.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2576,6 +2591,7 @@ dependencies = [
 "checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
 "checksum blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6d530bdd2d52966a6d03b7a964add7ae1a288d25214066fd4b600f0f796400"
 "checksum block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0d8c1fef690941d3e7788d328517591fecc684c084084702d6ff1641e993699a"
+"checksum byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0fc10e8cc6b2580fda3f36eb6dc5316657f812a3df879a44a66fc9f0fdbc4855"
 "checksum byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a019b10a2a7cdeb292db131fc8113e57ea2a908f6e7894b0c3c671893b65dbeb"
 "checksum c_vec 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6237ac5a4b1e81c213c24c6437964c61e646df910a914b4ab1487b46df20bd13"
 "checksum cairo-rs 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0180a8b65dc13e78479c6a47c4d5f094d64dc34465a9433c6daef9ae2fbfb3ee"
@@ -2684,6 +2700,7 @@ dependencies = [
 "checksum linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "ae91b68aebc4ddb91978b11a1b02ddd8602a05ec19002801c5666000e05e0f83"
 "checksum lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "62ebf1391f6acad60e5c8b43706dde4582df75c06698ab44511d15016bc2442c"
 "checksum log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c84ec4b527950aa83a329754b01dbe3f58361d1c5efacd1f6d68c494d08a17c6"
+"checksum lz4-compress 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0f966533a922a9bba9e95e594c1fdb3b9bf5fdcdb11e37e51ad84cd76e468b91"
 "checksum lzw 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7d947cbb889ed21c2a84be6ffbaebf5b4e0f4340638cba0444907e38b56be084"
 "checksum malloc_buf 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "62bb907fe88d54d8d9ce32a3cceab4218ed2f6b7d35617cafe9adf84e43919cb"
 "checksum memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2efc7bc57c883d4a4d6e3246905283d8dae951bb3bd32f49d6ef297f546e1c39"
diff --git a/client/Cargo.lock b/client/Cargo.lock
new file mode 100644
index 0000000000..9a47c24bc9
--- /dev/null
+++ b/client/Cargo.lock
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diff --git a/client/src/lib.rs b/client/src/lib.rs
index 9df0e535fc..392aa4c3d7 100644
--- a/client/src/lib.rs
+++ b/client/src/lib.rs
@@ -195,7 +195,7 @@ impl Client {
             // Remove chunks that are too far from the player
             let mut chunks_to_remove = Vec::new();
             self.state.terrain().iter().for_each(|(key, _)| {
-                if (chunk_pos - key).map(|e| e.abs()).reduce_max() > 3 {
+                if (Vec2::from(chunk_pos) - Vec2::from(key)).map(|e: i32| e.abs()).reduce_max() > 3 {
                     chunks_to_remove.push(key);
                 }
             });
@@ -204,8 +204,8 @@ impl Client {
             }
 
             // Request chunks from the server
-            for i in chunk_pos.x - 0..chunk_pos.x + 1 {
-                for j in chunk_pos.y - 0..chunk_pos.y + 1 {
+            for i in chunk_pos.x - 2..chunk_pos.x + 3 {
+                for j in chunk_pos.y - 2..chunk_pos.y + 3 {
                     for k in 0..2 {
                         let key = Vec3::new(i, j, k);
                         if self.state.terrain().get_key(key).is_none()
diff --git a/common/Cargo.toml b/common/Cargo.toml
index 3237dba90a..750eaa4975 100644
--- a/common/Cargo.toml
+++ b/common/Cargo.toml
@@ -21,3 +21,4 @@ log = "0.4"
 rand = "0.5"
 rayon = "1.0"
 lazy_static = "1.3"
+lz4-compress = "0.1"
diff --git a/common/src/net/post2.rs b/common/src/net/post2.rs
index e861b010ed..88de025d57 100644
--- a/common/src/net/post2.rs
+++ b/common/src/net/post2.rs
@@ -193,7 +193,8 @@ impl<S: PostMsg, R: PostMsg> PostBox<S, R> {
                     match send_rx.try_recv() {
                         Ok(send_msg) => {
                             // Serialize message
-                            let mut msg_bytes = bincode::serialize(&send_msg).unwrap();
+                            let msg_bytes = bincode::serialize(&send_msg).unwrap();
+                            let mut msg_bytes = lz4_compress::compress(&msg_bytes);
 
                             // Assemble into packet
                             let mut packet_bytes = msg_bytes
@@ -274,7 +275,9 @@ impl<S: PostMsg, R: PostMsg> PostBox<S, R> {
 
                                 assert_eq!(checksum_found, checksum_expected, "Message checksum failed!");
 
-                                match bincode::deserialize(&incoming_buf[9..len + 9]) {
+                                let msg_bytes = lz4_compress::decompress(&incoming_buf[9..len + 9]).unwrap();
+
+                                match bincode::deserialize(&msg_bytes) {
                                     Ok(msg) => recv_tx.send(Ok(msg)).unwrap(),
                                     Err(err) => {
                                         println!("BINCODE ERROR: {:?}", err);
diff --git a/common/src/sys/phys.rs b/common/src/sys/phys.rs
index 32ba34b896..8e3bd1da3b 100644
--- a/common/src/sys/phys.rs
+++ b/common/src/sys/phys.rs
@@ -23,7 +23,7 @@ impl<'a> System<'a> for Sys {
     fn run(&mut self, (terrain, dt, mut positions, mut velocities): Self::SystemData) {
         for (pos, vel) in (&mut positions, &mut velocities).join() {
             // Gravity
-            vel.0.z -= GRAVITY * dt.0 as f32;
+            vel.0.z = (vel.0.z - GRAVITY * dt.0 as f32).max(-50.0);
 
             // Movement
             pos.0 += vel.0 * dt.0 as f32;
diff --git a/server/src/lib.rs b/server/src/lib.rs
index f25d62c468..f0b93fbc6d 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -191,7 +191,7 @@ impl Server {
                 .join()
             {
                 let chunk_pos = self.state.terrain().pos_key(pos.0.map(|e| e as i32));
-                let dist = (chunk_pos - key).map(|e| e.abs()).reduce_max();
+                let dist = (Vec2::from(chunk_pos) - Vec2::from(key)).map(|e: i32| e.abs()).reduce_max();
 
                 if dist < 4 {
                     self.clients.notify(