uWebsockets

1 下载源码

https://github.com/uNetworking/uWebSockets

2 使用（服务端）

class Server {
public:
    std::promise<void> server_ready_promise;

    struct MyData
    {
       /* data */
       std::string custom_data;
    };

    void runServer() {
       uWS::App().ws<MyData>("/*", {
           .open = [](auto* ws) {
              MyData* myData = (MyData*)ws->getUserData();
              myData->custom_data = "initial data";
              std::cout << "Server: Client connected" << std::endl;
           },
           .message = [](auto* ws, std::string_view message, uWS::OpCode opCode) {
             std::cout << "Server: Received and broadcast message: " << message << std::endl;
              ws->publish("broadcast", message, opCode);
           },
           .close = [](auto* ws, int code, std::string_view message) {
              std::cout << "Server: Client disconnected" << std::endl;
           }
          }).listen(9001, [this](auto* listen_socket) {
             if (listen_socket) {
                std::cout << "Server listening on port 9001" << std::endl;
                server_ready_promise.set_value(); // 服务器已准备好
             }
             }).run();
    }
};

3 加到UE中

BUG:

1 Warning C4996 : 'getenv': This function or variable may be unsafe. Consider using _dupenv_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

使用_dupenv_s代替：// 原代码（产生警告）

const char* env_value = getenv("ENV_VAR_NAME");

// 替换为
char* env_value = nullptr;
size_t len = 0;
errno_t err = _dupenv_s(&env_value, &len, "ENV_VAR_NAME");

BUG:

2 HttpParser.h(359): Error C4459 : “err”的声明隐藏了全局声明

将局部变量名改为其他名称，避免与全局冲突：err->localerr

BUG:

3 从“unsigned char”到 bool 的隐式转换。信息可能丢失

使用 static_cast显示转换 

　　<bool>(numMessageIndices);

BUG:

4 从“int”到 bool 的隐式转换。信息可能丢失

protocol::formatMessage<isServer>(sendBuffer, message.data(), message.length(), opCode, message.length(), static_cast<bool>(compress), fin);

static_cast<bool>(compress)

BUG:

5 WebSocket.h(168): Error C4456 : “webSocketData”的声明隐藏了上一个本地声明

WebSocketData *webSocketData_ = (WebSocketData *) Super::getAsyncSocketData();