axmol/core/network/WebSocket-wasm.cpp

/****************************************************************************
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2019-present Axmol Engine contributors (see AUTHORS.md).
 
 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/
 
#include "network/WebSocket-wasm.h"
#include "yasio/errc.hpp"
#include "base/Logging.h"

NS_AX_BEGIN

namespace network
{

EM_BOOL WebSocket::em_ws_onopen(int eventType, const EmscriptenWebSocketOpenEvent* websocketEvent, void* userData)
{
    auto ws = static_cast<WebSocket*>(userData);
    if (!ws || !ws->_delegate)
        return EM_TRUE;
    ws->_state = WebSocket::State::OPEN;
    ws->_delegate->onOpen(ws);
    return EM_TRUE;
}

EM_BOOL WebSocket::em_ws_onerror(int eventType, const EmscriptenWebSocketErrorEvent* websocketEvent, void* userData)
{
    auto ws = static_cast<WebSocket*>(userData);
    if (!ws || !ws->_delegate)
        return EM_TRUE;
    ws->_state = WebSocket::State::CLOSED;
    ws->_delegate->onError(ws, ErrorCode::CONNECTION_FAILURE);
    return EM_TRUE;
}

EM_BOOL WebSocket::em_ws_onclose(int eventType, const EmscriptenWebSocketCloseEvent* websocketEvent, void* userData)
{
    auto ws = static_cast<WebSocket*>(userData);
    if (!ws || !ws->_delegate)
        return EM_TRUE;
    ws->_state = WebSocket::State::CLOSED;
    ws->_delegate->onClose(ws);
    return EM_TRUE;
}

EM_BOOL WebSocket::em_ws_onmessage(int eventType, const EmscriptenWebSocketMessageEvent* websocketEvent, void* userData)
{
    auto ws = static_cast<WebSocket*>(userData);
    if (!ws || !ws->_delegate)
        return EM_TRUE;
    WebSocket::Data dataView;
    dataView.bytes    = reinterpret_cast<const char*>(websocketEvent->data);
    dataView.isBinary = !websocketEvent->isText;
    dataView.len      = websocketEvent->numBytes;
    ws->_delegate->onMessage(ws, dataView);
    return EM_TRUE;
}

WebSocket::WebSocket() {}

WebSocket::~WebSocket() {}

bool WebSocket::open(Delegate* delegate, std::string_view url, std::string_view caFilePath, std::string_view protocols)
{
    if (url.empty())
    {
        AXLOGW("ws open fail, url is empty!");
        return false;
    }

    _delegate = delegate;

    _url          = url;
    _subProtocols = protocols;

    EmscriptenWebSocketCreateAttributes ws_attrs = {_url.c_str(),
                                                    _subProtocols.empty() ? nullptr : _subProtocols.c_str(), EM_TRUE};

    AXLOGD("ws open url: {}, protocols: {}", ws_attrs.url, ws_attrs.protocols);

    _state = WebSocket::State::CONNECTING;
    _wsfd = emscripten_websocket_new(&ws_attrs);

    // chrome/edge can't connect
    // firefox works with "Sec-Fetch-Site: cross-site" in request header
    // refer: https://github.com/emscripten-core/emscripten/issues/19100
    // wasm websocket callback thread same with axmol render thread
    emscripten_websocket_set_onopen_callback(_wsfd, this, em_ws_onopen);
    emscripten_websocket_set_onerror_callback(_wsfd, this, em_ws_onerror);
    emscripten_websocket_set_onclose_callback(_wsfd, this, em_ws_onclose);
    emscripten_websocket_set_onmessage_callback(_wsfd, this, em_ws_onmessage);
    return true;
}
/**
 *  @brief Sends string data to websocket server.
 *
 *  @param message string data.
 *  @lua sendstring
 */
void WebSocket::send(std::string_view message)
{
    auto error = emscripten_websocket_send_utf8_text(_wsfd, message.data());
    if (error)
        AXLOGW("Failed to emscripten_websocket_send_binary(): {}", error);
}

/**
 *  @brief Sends binary data to websocket server.
 *
 *  @param binaryMsg binary string data.
 *  @param len the size of binary string data.
 *  @lua sendstring
 */
void WebSocket::send(const void* data, unsigned int len)
{
    auto error = emscripten_websocket_send_binary(_wsfd, const_cast<void*>(data), len);
    if (error)
        AXLOGW("Failed to emscripten_websocket_send_binary(): {}", error);
}

/**
 *  @brief Closes the connection to server synchronously.
 *  @note It's a synchronous method, it will not return until websocket thread exits.
 */
void WebSocket::close()
{
    closeAsync();  // TODO
}

/**
 *  @brief Closes the connection to server asynchronously.
 *  @note It's an asynchronous method, it just notifies websocket thread to exit and returns directly,
 *        If using 'closeAsync' to close websocket connection,
 *        be careful of not using destructed variables in the callback of 'onClose'.
 */
void WebSocket::closeAsync()
{
    // close code: Uncaught DOMException: Failed to execute 'close' on 'WebSocket':
    // The code must be either 1000, or between 3000 and 4999. 1024 is neither.
    EMSCRIPTEN_RESULT error =
        emscripten_websocket_close(_wsfd, 3000 - yasio::errc::shutdown_by_localhost, "shutdown by localhost");
    if (!error)
        _state = WebSocket::State::CLOSING;
    else
        AXLOGW("Failed to emscripten_websocket_close(): {}", error);
}

}  // namespace network

NS_AX_END