cocos-enhance-kit/cocos2d-x/cocos/network/WebSocket.h

/****************************************************************************
 Copyright (c) 2010-2012 cocos2d-x.org
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 http://www.cocos2d-x.org

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 of this software and associated documentation files (the "Software"), to deal
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 ****************************************************************************/

#pragma once

#include "base/ccMacros.h"
#include "platform/CCStdC.h"
#include "base/CCRef.h"

#include <string>
#include <vector>
#include <algorithm>

#ifndef OBJC_CLASS
#ifdef __OBJC__
#define OBJC_CLASS(name) @class name
#else
#define OBJC_CLASS(name) class name
#endif
#endif // OBJC_CLASS

OBJC_CLASS(WebSocketImpl);

/**
 * @addtogroup network
 * @{
 */

NS_CC_BEGIN

namespace network {


class WebSocketFrame;

/**
 * WebSocket is wrapper of the libwebsockets-protocol, let the develop could call the websocket easily.
 * Please note that all public methods of WebSocket have to be invoked on Cocos Thread.
 */
class CC_DLL WebSocket : public Ref
{
public:
    /**
     * Close all connections and wait for all websocket threads to exit
     * @note This method has to be invoked on Cocos Thread
     */
    static void closeAllConnections();
    
    /**
     * Constructor of WebSocket.
     *
     * @js ctor
     */
    WebSocket();

private:
    /**
     * Destructor of WebSocket.
     *
     * @js NA
     * @lua NA
     */
    virtual ~WebSocket();

public:
    /**
     * Data structure for message
     */
    struct Data
    {
        Data():bytes(nullptr), len(0), issued(0), isBinary(false), ext(nullptr){}
        char* bytes;
        ssize_t len, issued;
        bool isBinary;
        void* ext;
        ssize_t getRemain() { return std::max((ssize_t)0, len - issued); }
    };

    /**
     * ErrorCode enum used to represent the error in the websocket.
     */
    enum class ErrorCode
    {
        TIME_OUT,           /** &lt; value 0 */
        CONNECTION_FAILURE, /** &lt; value 1 */
        UNKNOWN,            /** &lt; value 2 */
    };

    /**
     *  State enum used to represent the Websocket state.
     */
    enum class State
    {
        CONNECTING,  /** &lt; value 0 */
        OPEN,        /** &lt; value 1 */
        CLOSING,     /** &lt; value 2 */
        CLOSED,      /** &lt; value 3 */
    };

    /**
     * The delegate class is used to process websocket events.
     *
     * The most member function are pure virtual functions,they should be implemented the in subclass.
     * @lua NA
     */
    class Delegate
    {
    public:
        /** Destructor of Delegate. */
        virtual ~Delegate() {}
        /**
         * This function to be called after the client connection complete a handshake with the remote server.
         * This means that the WebSocket connection is ready to send and receive data.
         * 
         * @param ws The WebSocket object connected
         */
        virtual void onOpen(WebSocket* ws) = 0;
        /**
         * This function to be called when data has appeared from the server for the client connection.
         *
         * @param ws The WebSocket object connected.
         * @param data Data object for message.
         */
        virtual void onMessage(WebSocket* ws, const Data& data) = 0;
        /**
         * When the WebSocket object connected wants to close or the protocol won't get used at all and current _readyState is State::CLOSING,this function is to be called.
         *
         * @param ws The WebSocket object connected.
         */
        virtual void onClose(WebSocket* ws) = 0;
        /**
         * This function is to be called in the following cases:
         * 1. client connection is failed.
         * 2. the request client connection has been unable to complete a handshake with the remote server.
         * 3. the protocol won't get used at all after this callback and current _readyState is State::CONNECTING.
         * 4. when a socket descriptor needs to be removed from an external polling array. in is again the struct libwebsocket_pollargs containing the fd member to be removed. If you are using the internal polling loop, you can just ignore it and current _readyState is State::CONNECTING.
         *
         * @param ws The WebSocket object connected.
         * @param error WebSocket::ErrorCode enum,would be ErrorCode::TIME_OUT or ErrorCode::CONNECTION_FAILURE.
         */
        virtual void onError(WebSocket* ws, const ErrorCode& error) = 0;
    };

    /**
     *  @brief The initialized method for websocket.
     *         It needs to be invoked right after websocket instance is allocated.
     *  @param delegate The delegate which want to receive event from websocket.
     *  @param url The URL of websocket server.
     *  @param protocols The websocket protocols that agree with websocket server
     *  @param caFilePath The ca file path for wss connection
     *  @return true: Success, false: Failure.
     *  @lua NA
     */
    bool init(const Delegate& delegate,
              const std::string& url,
              const std::vector<std::string>* protocols = nullptr,
              const std::string& caFilePath = "");

    /**
     *  @brief Sends string data to websocket server.
     *  
     *  @param message string data.
     *  @lua sendstring
     */
    void send(const std::string& message);

    /**
     *  @brief Sends binary data to websocket server.
     *  
     *  @param binaryMsg binary string data.
     *  @param len the size of binary string data.
     *  @lua sendstring
     */
    void send(const unsigned char* binaryMsg, unsigned int len);

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

    /**
    *  @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'.
    *  @param code close reason
    *  @param reason reason text description
    */
    void closeAsync(int code, const std::string &reason);

    /**
     *  @brief Gets current state of connection.
     *  @return State the state value could be State::CONNECTING, State::OPEN, State::CLOSING or State::CLOSED
     */
    State getReadyState() const;

    /**
     *  @brief Gets the URL of websocket connection.
     */
    const std::string& getUrl() const;

    /**
    * @brief Returns the number of bytes of data that have been queued using calls to send() but not yet transmitted to the network.
    */
    size_t getBufferedAmount() const;

    /**
    * @brief Returns the extensions selected by the server.
    */
    std::string getExtensions() const;

    /**
     *  @brief Gets the protocol selected by websocket server.
     */
    const std::string& getProtocol() const;

    Delegate* getDelegate() const;
private:
    WebSocketImpl* _impl;
};

} // namespace network {

NS_CC_END

// end group
/// @}