Wrapper for converting libWebSocket callback from static function to member function of webSocketServer class.-Go服务器开发

Here’s an example of how you can create a wrapper to convert a static function callback from libWebSocket to a member function of the webSocketServer class:

class webSocketServer {
public:
    void start() {
        // Create WebSocket server and set the callback to the wrapper function
        websocket_server = websocket_create_server(..., &webSocketCallbackWrapper, this);
    }

private:
    static int webSocketCallbackWrapper(struct lws* wsi, enum lws_callback_reasons reason, void* user, void* in, size_t len) {
        // Get the instance pointer from the user data
        webSocketServer* instance = static_cast<webSocketServer*>(user);

        // Call the non-static member function callback
        return instance->webSocketCallback(wsi, reason, in, len);
    }

    int webSocketCallback(struct lws* wsi, enum lws_callback_reasons reason, void* in, size_t len) {
        // Your member function implementation goes here

        // Return value according to libWebSocket callback requirements
        return 0;
    }

    struct lws_context* websocket_server;
};

In this example, we have a webSocketServer class with a start() method that creates a WebSocket server using libWebSocket. The key part is the webSocketCallbackWrapper static function which acts as an intermediate layer between the libWebSocket callback and the actual member function callback webSocketCallback. Inside the wrapper function, it retrieves the instance pointer from the user data and then calls the corresponding member function.

By passing this as user data when setting up the WebSocket server (websocket_create_server), we can access the instance of webSocketServer inside our member function. This allows us to use all non-static members and methods within our actual callback implementation.

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