initial code

qchateau · Sep 12, 2020 · 55632a9 · 55632a9
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diff --git a/.clang-format b/.clang-format
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diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,6 @@
+build/
+.history/
+.vs-code/
+.clangd/
+
+compile_commands.json
diff --git a/README.md b/README.md
@@ -1 +1,19 @@
-# experimental-ws-game
+# experimental-ws-game
+
+Trying out boost.beast with C++20 coroutines and websockets.
+
+Maybe this will become a mini-game one day.
+
+# How to run
+
+```bash
+# build the server
+mkdir -p server/build
+cd server/build
+CXX=clang++-10 CC=clang-10 cmake .. -DCMAKE_BUILD_TYPE=Release
+make -j
+cd ../../
+
+# serve the application
+docker-compose up -d
+```
diff --git a/client/index.html b/client/index.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="UTF-8" />
+    <title>Test client</title>
+    <script src="index.js"></script>
+  </head>
+
+  <body>
+    <div>Hello !</div>
+    <canvas id="canvas"></canvas>
+  </body>
+</html>
diff --git a/client/index.js b/client/index.js
@@ -0,0 +1,62 @@
+class CanvasManager {
+  constructor(id) {
+    this.canvas = document.getElementById(id);
+    this.canvas.width = window.innerWidth;
+    this.canvas.height = window.innerHeight;
+    this.ctx = this.canvas.getContext("2d");
+  }
+
+  drawRect(x, y) {
+    const w = 100;
+    const h = 100;
+
+    this.clear();
+    this.ctx.fillStyle = "green";
+    this.ctx.fillRect(x - w / 2, y - h / 2, w, h);
+  }
+
+  clear() {
+    this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
+  }
+}
+
+class Engine {
+  constructor(url, canvasId) {
+    this.canvas = new CanvasManager(canvasId);
+    this.sock = new WebSocket(url);
+    this.sock.onopen = function () {
+      this.onOpen();
+    }.bind(this);
+
+    // Log errors
+    this.sock.onerror = function (error) {
+      this.onError(error);
+    }.bind(this);
+
+    // Log messages from the server
+    this.sock.onmessage = function (e) {
+      const msg = JSON.parse(e.data);
+      this.onMessage(msg);
+    }.bind(this);
+  }
+
+  onOpen() {
+    console.log("Starting communication");
+  }
+
+  onError(error) {
+    console.error("WebSocket error", error);
+  }
+
+  onMessage(msg) {
+    console.log(msg);
+    this.canvas.drawRect(msg.x, msg.y);
+  }
+}
+
+function main() {
+  console.log("Running ...");
+  engine = new Engine("ws://localhost:8080/ws", "canvas");
+}
+
+window.onload = main;
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -0,0 +1,20 @@
+version: "3.2"
+
+services:
+  nginx:
+    restart: always
+    image: nginx:1.19
+    volumes:
+      - ./nginx:/etc/nginx/templates
+      - ./client:/www/data
+    ports:
+      - "8080:80"
+    environment:
+      - WS_SERVER=ws_backend:5678
+
+  ws_backend:
+    restart: always
+    image: alpine:3.12
+    volumes:
+      - ./server/build/bin:/server/
+    command: /server/server 0.0.0.0 5678 1
diff --git a/nginx/default.conf.template b/nginx/default.conf.template
@@ -0,0 +1,25 @@
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    '' close;
+}
+
+upstream websocket {
+    server ${WS_SERVER};
+}
+
+server {
+    listen 80;
+
+    location / {
+        root /www/data;
+    }
+
+    location /ws {
+        proxy_pass http://websocket;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "Upgrade";
+        proxy_set_header Host $host;
+        proxy_cache_bypass $http_upgrade;
+    }
+}
diff --git a/server/CMakeLists.txt b/server/CMakeLists.txt
@@ -0,0 +1,51 @@
+cmake_minimum_required(VERSION 3.10.2)
+project(spaceinvader_server)
+
+include(cmake/conan.cmake)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+add_compile_options(-fcoroutines-ts -stdlib=libc++)
+# set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static  -stdlib=libc++ -lc++abi")
+
+# add this to have a working compile_commands.json ...
+include_directories(SYSTEM /usr/lib/llvm-10/include/c++/v1/)
+
+conan_cmake_run(
+    BASIC_SETUP
+    CMAKE_TARGETS
+    REQUIRES
+        fmt/7.0.1
+        spdlog/1.8.0
+        boost/1.74.0
+        nlohmann_json/3.9.1
+    INSTALL_ARGS
+        --build missing
+)
+
+add_executable(
+    server
+
+    main.cpp
+    listener.cpp
+    session.cpp
+)
+target_link_libraries(
+    server
+
+    CONAN_PKG::fmt
+    CONAN_PKG::spdlog
+    CONAN_PKG::boost
+    CONAN_PKG::nlohmann_json
+)
+target_link_options(
+    server
+    PUBLIC
+
+    -static
+    -stdlib=libc++
+    -lc++abi
+    -fuse-ld=lld
+)