mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-01 00:57:28 +08:00
243 lines
8.1 KiB
C++
243 lines
8.1 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef ZLMEDIAKIT_WEBSOCKETSESSION_H
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#define ZLMEDIAKIT_WEBSOCKETSESSION_H
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#include "HttpSession.h"
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#include "Network/TcpServer.h"
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/**
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* 数据发送拦截器
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*/
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class SendInterceptor{
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public:
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typedef function<int(const Buffer::Ptr &buf)> onBeforeSendCB;
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SendInterceptor() = default;
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virtual ~SendInterceptor() = default;
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virtual void setOnBeforeSendCB(const onBeforeSendCB &cb) = 0;
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};
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/**
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* 该类实现了TcpSession派生类发送数据的截取
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* 目的是发送业务数据前进行websocket协议的打包
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*/
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template <typename TcpSessionType>
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class TcpSessionTypeImp : public TcpSessionType, public SendInterceptor{
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public:
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typedef std::shared_ptr<TcpSessionTypeImp> Ptr;
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TcpSessionTypeImp(const Parser &header, const HttpSession &parent, const Socket::Ptr &pSock) :
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_identifier(parent.getIdentifier()), TcpSessionType(pSock) {}
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~TcpSessionTypeImp() {}
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/**
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* 设置发送数据截取回调函数
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* @param cb 截取回调函数
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*/
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void setOnBeforeSendCB(const onBeforeSendCB &cb) override {
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_beforeSendCB = cb;
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}
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protected:
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/**
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* 重载send函数截取数据
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* @param buf 需要截取的数据
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* @return 数据字节数
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*/
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int send(Buffer::Ptr buf) override {
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if (_beforeSendCB) {
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return _beforeSendCB(buf);
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}
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return TcpSessionType::send(std::move(buf));
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}
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string getIdentifier() const override {
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return _identifier;
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}
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private:
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onBeforeSendCB _beforeSendCB;
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string _identifier;
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};
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template <typename TcpSessionType>
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class TcpSessionCreator {
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public:
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//返回的TcpSession必须派生于SendInterceptor，可以返回null
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TcpSession::Ptr operator()(const Parser &header, const HttpSession &parent, const Socket::Ptr &pSock){
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return std::make_shared<TcpSessionTypeImp<TcpSessionType> >(header,parent,pSock);
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}
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};
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/**
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* 通过该模板类可以透明化WebSocket协议，
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* 用户只要实现WebSock协议下的具体业务协议，譬如基于WebSocket协议的Rtmp协议等
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*/
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template<typename Creator, typename HttpSessionType = HttpSession, WebSocketHeader::Type DataType = WebSocketHeader::TEXT>
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class WebSocketSessionBase : public HttpSessionType {
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public:
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WebSocketSessionBase(const Socket::Ptr &pSock) : HttpSessionType(pSock){}
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virtual ~WebSocketSessionBase(){}
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//收到eof或其他导致脱离TcpServer事件的回调
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void onError(const SockException &err) override{
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HttpSessionType::onError(err);
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if(_session){
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_session->onError(err);
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}
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}
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//每隔一段时间触发，用来做超时管理
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void onManager() override{
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if(_session){
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_session->onManager();
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}else{
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HttpSessionType::onManager();
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}
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}
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void attachServer(const TcpServer &server) override{
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HttpSessionType::attachServer(server);
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_weak_server = const_cast<TcpServer &>(server).shared_from_this();
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}
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protected:
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/**
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* websocket客户端连接上事件
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* @param header http头
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* @return true代表允许websocket连接，否则拒绝
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*/
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bool onWebSocketConnect(const Parser &header) override{
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//创建websocket session类
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_session = _creator(header, *this,HttpSessionType::getSock());
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if(!_session){
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//此url不允许创建websocket连接
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return false;
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}
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auto strongServer = _weak_server.lock();
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if(strongServer){
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_session->attachServer(*strongServer);
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}
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//此处截取数据并进行websocket协议打包
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weak_ptr<WebSocketSessionBase> weakSelf = dynamic_pointer_cast<WebSocketSessionBase>(HttpSessionType::shared_from_this());
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dynamic_pointer_cast<SendInterceptor>(_session)->setOnBeforeSendCB([weakSelf](const Buffer::Ptr &buf) {
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auto strongSelf = weakSelf.lock();
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if (strongSelf) {
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WebSocketHeader header;
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header._fin = true;
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header._reserved = 0;
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header._opcode = DataType;
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header._mask_flag = false;
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strongSelf->WebSocketSplitter::encode(header, buf);
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}
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return buf->size();
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});
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//允许websocket客户端
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return true;
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}
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/**
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* 开始收到一个webSocket数据包
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*/
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void onWebSocketDecodeHeader(const WebSocketHeader &packet) override{
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//新包，原来的包残余数据清空掉
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_payload_section.clear();
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}
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/**
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* 收到websocket数据包负载
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*/
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void onWebSocketDecodePayload(const WebSocketHeader &packet,const uint8_t *ptr,uint64_t len,uint64_t recved) override {
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_payload_section.append((char *)ptr,len);
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}
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/**
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* 接收到完整的一个webSocket数据包后回调
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* @param header 数据包包头
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*/
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void onWebSocketDecodeComplete(const WebSocketHeader &header_in) override {
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WebSocketHeader& header = const_cast<WebSocketHeader&>(header_in);
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auto flag = header._mask_flag;
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header._mask_flag = false;
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switch (header._opcode){
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case WebSocketHeader::CLOSE:{
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HttpSessionType::encode(header,nullptr);
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HttpSessionType::shutdown(SockException(Err_shutdown, "recv close request from client"));
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break;
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}
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case WebSocketHeader::PING:{
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header._opcode = WebSocketHeader::PONG;
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HttpSessionType::encode(header,std::make_shared<BufferString>(_payload_section));
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break;
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}
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case WebSocketHeader::CONTINUATION:
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case WebSocketHeader::TEXT:
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case WebSocketHeader::BINARY:{
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if (!header._fin) {
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//还有后续分片数据, 我们先缓存数据，所有分片收集完成才一次性输出
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_payload_cache.append(std::move(_payload_section));
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if (_payload_cache.size() < MAX_WS_PACKET) {
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//还有内存容量缓存分片数据
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break;
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}
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//分片缓存太大，需要清空
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}
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//最后一个包
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if (_payload_cache.empty()) {
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//这个包是唯一个分片
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_session->onRecv(std::make_shared<WebSocketBuffer>(header._opcode, header._fin, std::move(_payload_section)));
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break;
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}
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//这个包由多个分片组成
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_payload_cache.append(std::move(_payload_section));
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_session->onRecv(std::make_shared<WebSocketBuffer>(header._opcode, header._fin, std::move(_payload_cache)));
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_payload_cache.clear();
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break;
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}
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default: break;
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}
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_payload_section.clear();
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header._mask_flag = flag;
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}
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/**
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* 发送数据进行websocket协议打包后回调
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*/
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void onWebSocketEncodeData(Buffer::Ptr buffer) override{
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HttpSessionType::send(std::move(buffer));
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}
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private:
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string _payload_cache;
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string _payload_section;
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weak_ptr<TcpServer> _weak_server;
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TcpSession::Ptr _session;
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Creator _creator;
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};
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template<typename TcpSessionType,typename HttpSessionType = HttpSession,WebSocketHeader::Type DataType = WebSocketHeader::TEXT>
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class WebSocketSession : public WebSocketSessionBase<TcpSessionCreator<TcpSessionType>,HttpSessionType,DataType>{
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public:
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WebSocketSession(const Socket::Ptr &pSock) : WebSocketSessionBase<TcpSessionCreator<TcpSessionType>,HttpSessionType,DataType>(pSock){}
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virtual ~WebSocketSession(){}
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};
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#endif //ZLMEDIAKIT_WEBSOCKETSESSION_H
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