mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-10-31 16:47:28 +08:00
243 lines
8.1 KiB
C++
243 lines
8.1 KiB
C++
/*
|
||
* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
|
||
*
|
||
* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
|
||
*
|
||
* Use of this source code is governed by MIT license that can be found in the
|
||
* LICENSE file in the root of the source tree. All contributing project authors
|
||
* may be found in the AUTHORS file in the root of the source tree.
|
||
*/
|
||
|
||
#ifndef ZLMEDIAKIT_WEBSOCKETSESSION_H
|
||
#define ZLMEDIAKIT_WEBSOCKETSESSION_H
|
||
|
||
#include "HttpSession.h"
|
||
#include "Network/TcpServer.h"
|
||
|
||
/**
|
||
* 数据发送拦截器
|
||
*/
|
||
class SendInterceptor{
|
||
public:
|
||
typedef function<ssize_t (const Buffer::Ptr &buf)> onBeforeSendCB;
|
||
SendInterceptor() = default;
|
||
virtual ~SendInterceptor() = default;
|
||
virtual void setOnBeforeSendCB(const onBeforeSendCB &cb) = 0;
|
||
};
|
||
|
||
/**
|
||
* 该类实现了TcpSession派生类发送数据的截取
|
||
* 目的是发送业务数据前进行websocket协议的打包
|
||
*/
|
||
template <typename TcpSessionType>
|
||
class TcpSessionTypeImp : public TcpSessionType, public SendInterceptor{
|
||
public:
|
||
typedef std::shared_ptr<TcpSessionTypeImp> Ptr;
|
||
|
||
TcpSessionTypeImp(const Parser &header, const HttpSession &parent, const Socket::Ptr &pSock) :
|
||
TcpSessionType(pSock), _identifier(parent.getIdentifier()) {}
|
||
|
||
~TcpSessionTypeImp() {}
|
||
|
||
/**
|
||
* 设置发送数据截取回调函数
|
||
* @param cb 截取回调函数
|
||
*/
|
||
void setOnBeforeSendCB(const onBeforeSendCB &cb) override {
|
||
_beforeSendCB = cb;
|
||
}
|
||
|
||
protected:
|
||
/**
|
||
* 重载send函数截取数据
|
||
* @param buf 需要截取的数据
|
||
* @return 数据字节数
|
||
*/
|
||
ssize_t send(Buffer::Ptr buf) override {
|
||
if (_beforeSendCB) {
|
||
return _beforeSendCB(buf);
|
||
}
|
||
return TcpSessionType::send(std::move(buf));
|
||
}
|
||
|
||
string getIdentifier() const override {
|
||
return _identifier;
|
||
}
|
||
|
||
private:
|
||
string _identifier;
|
||
onBeforeSendCB _beforeSendCB;
|
||
};
|
||
|
||
template <typename TcpSessionType>
|
||
class TcpSessionCreator {
|
||
public:
|
||
//返回的TcpSession必须派生于SendInterceptor，可以返回null
|
||
TcpSession::Ptr operator()(const Parser &header, const HttpSession &parent, const Socket::Ptr &pSock){
|
||
return std::make_shared<TcpSessionTypeImp<TcpSessionType> >(header,parent,pSock);
|
||
}
|
||
};
|
||
|
||
/**
|
||
* 通过该模板类可以透明化WebSocket协议，
|
||
* 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
|
||
*/
|
||
template<typename Creator, typename HttpSessionType = HttpSession, WebSocketHeader::Type DataType = WebSocketHeader::TEXT>
|
||
class WebSocketSessionBase : public HttpSessionType {
|
||
public:
|
||
WebSocketSessionBase(const Socket::Ptr &pSock) : HttpSessionType(pSock){}
|
||
virtual ~WebSocketSessionBase(){}
|
||
|
||
//收到eof或其他导致脱离TcpServer事件的回调
|
||
void onError(const SockException &err) override{
|
||
HttpSessionType::onError(err);
|
||
if(_session){
|
||
_session->onError(err);
|
||
}
|
||
}
|
||
//每隔一段时间触发，用来做超时管理
|
||
void onManager() override{
|
||
if(_session){
|
||
_session->onManager();
|
||
}else{
|
||
HttpSessionType::onManager();
|
||
}
|
||
}
|
||
|
||
void attachServer(const TcpServer &server) override{
|
||
HttpSessionType::attachServer(server);
|
||
_weak_server = const_cast<TcpServer &>(server).shared_from_this();
|
||
}
|
||
|
||
protected:
|
||
/**
|
||
* websocket客户端连接上事件
|
||
* @param header http头
|
||
* @return true代表允许websocket连接，否则拒绝
|
||
*/
|
||
bool onWebSocketConnect(const Parser &header) override{
|
||
//创建websocket session类
|
||
_session = _creator(header, *this,HttpSessionType::getSock());
|
||
if(!_session){
|
||
//此url不允许创建websocket连接
|
||
return false;
|
||
}
|
||
auto strongServer = _weak_server.lock();
|
||
if(strongServer){
|
||
_session->attachServer(*strongServer);
|
||
}
|
||
|
||
//此处截取数据并进行websocket协议打包
|
||
weak_ptr<WebSocketSessionBase> weakSelf = dynamic_pointer_cast<WebSocketSessionBase>(HttpSessionType::shared_from_this());
|
||
dynamic_pointer_cast<SendInterceptor>(_session)->setOnBeforeSendCB([weakSelf](const Buffer::Ptr &buf) {
|
||
auto strongSelf = weakSelf.lock();
|
||
if (strongSelf) {
|
||
WebSocketHeader header;
|
||
header._fin = true;
|
||
header._reserved = 0;
|
||
header._opcode = DataType;
|
||
header._mask_flag = false;
|
||
strongSelf->WebSocketSplitter::encode(header, buf);
|
||
}
|
||
return buf->size();
|
||
});
|
||
|
||
//允许websocket客户端
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* 开始收到一个webSocket数据包
|
||
*/
|
||
void onWebSocketDecodeHeader(const WebSocketHeader &packet) override{
|
||
//新包，原来的包残余数据清空掉
|
||
_payload_section.clear();
|
||
}
|
||
|
||
/**
|
||
* 收到websocket数据包负载
|
||
*/
|
||
void onWebSocketDecodePayload(const WebSocketHeader &packet,const uint8_t *ptr,size_t len,size_t recved) override {
|
||
_payload_section.append((char *)ptr,len);
|
||
}
|
||
|
||
/**
|
||
* 接收到完整的一个webSocket数据包后回调
|
||
* @param header 数据包包头
|
||
*/
|
||
void onWebSocketDecodeComplete(const WebSocketHeader &header_in) override {
|
||
WebSocketHeader& header = const_cast<WebSocketHeader&>(header_in);
|
||
auto flag = header._mask_flag;
|
||
header._mask_flag = false;
|
||
|
||
switch (header._opcode){
|
||
case WebSocketHeader::CLOSE:{
|
||
HttpSessionType::encode(header,nullptr);
|
||
HttpSessionType::shutdown(SockException(Err_shutdown, "recv close request from client"));
|
||
break;
|
||
}
|
||
|
||
case WebSocketHeader::PING:{
|
||
header._opcode = WebSocketHeader::PONG;
|
||
HttpSessionType::encode(header,std::make_shared<BufferString>(_payload_section));
|
||
break;
|
||
}
|
||
|
||
case WebSocketHeader::CONTINUATION:
|
||
case WebSocketHeader::TEXT:
|
||
case WebSocketHeader::BINARY:{
|
||
if (!header._fin) {
|
||
//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
|
||
_payload_cache.append(std::move(_payload_section));
|
||
if (_payload_cache.size() < MAX_WS_PACKET) {
|
||
//还有内存容量缓存分片数据
|
||
break;
|
||
}
|
||
//分片缓存太大，需要清空
|
||
}
|
||
|
||
//最后一个包
|
||
if (_payload_cache.empty()) {
|
||
//这个包是唯一个分片
|
||
_session->onRecv(std::make_shared<WebSocketBuffer>(header._opcode, header._fin, std::move(_payload_section)));
|
||
break;
|
||
}
|
||
|
||
//这个包由多个分片组成
|
||
_payload_cache.append(std::move(_payload_section));
|
||
_session->onRecv(std::make_shared<WebSocketBuffer>(header._opcode, header._fin, std::move(_payload_cache)));
|
||
_payload_cache.clear();
|
||
break;
|
||
}
|
||
|
||
default: break;
|
||
}
|
||
_payload_section.clear();
|
||
header._mask_flag = flag;
|
||
}
|
||
|
||
/**
|
||
* 发送数据进行websocket协议打包后回调
|
||
*/
|
||
void onWebSocketEncodeData(Buffer::Ptr buffer) override{
|
||
HttpSessionType::send(std::move(buffer));
|
||
}
|
||
|
||
private:
|
||
string _payload_cache;
|
||
string _payload_section;
|
||
weak_ptr<TcpServer> _weak_server;
|
||
TcpSession::Ptr _session;
|
||
Creator _creator;
|
||
};
|
||
|
||
|
||
template<typename TcpSessionType,typename HttpSessionType = HttpSession,WebSocketHeader::Type DataType = WebSocketHeader::TEXT>
|
||
class WebSocketSession : public WebSocketSessionBase<TcpSessionCreator<TcpSessionType>,HttpSessionType,DataType>{
|
||
public:
|
||
WebSocketSession(const Socket::Ptr &pSock) : WebSocketSessionBase<TcpSessionCreator<TcpSessionType>,HttpSessionType,DataType>(pSock){}
|
||
virtual ~WebSocketSession(){}
|
||
};
|
||
|
||
#endif //ZLMEDIAKIT_WEBSOCKETSESSION_H
|