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685 lines
18 KiB
Markdown
685 lines
18 KiB
Markdown
# Tars的push功能
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# 目录
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> * [1.环境和背景]
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> * [2.push模式的流程图]
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> * [3.服务端功能的实现]
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> * [4.客户端功能的实现]
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> * [5.测试结果]
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## 环境和背景
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但是在实际的应用场景中,需要在TARS服务框架中支持其他服务端到客户端的push模式
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具体程序示例,参见examples/pushDemo/.
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## push模式的流程图
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下面是push模式的示意图
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![tars](images/tars_flow.PNG)
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- 黑色线代表了数据流向:数据(客户端)-〉请求包的编码器(客户端)-〉协议解析器(服务端)-〉doRequest协议处理器(服务端)-〉生成返回数据(服务端)-〉响应包的解码器(客户端)-〉响应数据(客户端)
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- 黄色线代表客户端访问服务端
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- 蓝色线代表服务端向客户端push消息
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- 其中**请求包的编码器**(客户端)负责对客户端发送的数据进行打包编码,**协议解析器**(服务端)负责对收到的数据进行解包并交给*
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- **协议处理器**(服务端)去处理并生成返回数据,而**响应包的解码器**(客户端)负责对返回的数据进行解码。
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## Tars中实现服务端到客户端的push模式:
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- 对于服务端,首先服务端需要按照开发第三方协议的模式(即非tars协议),实现协议包的解析器,并将其加载到服务中,同时需要建立一个非TARS框架的服务对象,该类继续继承TARS框架的Servant类,通过重载Servant类中的doRequest方法建立客户端和服务端之间的协议处理器,同时在该方法中保存连接到服务端的客户信息,以便服务端向客户端push消息,另外需要重载Servant类中的doClose方法,在服务器得知客户关闭连接后,释放doRequest方法中保存的客户信息,这样就可以不需要对该客户进行push消息。另外,服务端需要建立一个专门用于向客户端push消息的线程。
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- 对应客户端,首先要按照第三方协议的模式,实现协议包的编解码函数,并将其设置到相应的ServantProxy代理的协议解析器中,通过ServantProxy类tars_set_protocol方法实现;然后需要自定义一个回调类,该类继承ServantProxyCallback类,(因为服务端push消息给客户端时,客户端收到消息是异步的,所以客户端对消息的处理以异步方法进行),同时需要重载其中的onDispatch方法,在该方法中,对客户端和服务端之间定义的协议进行解析处理;最后需要new一个上面自定义的回调类,然后将其作为参数传入到ServantProxy的tars_set_push_callback方法中。另外,客户端需要定期的发送消息给服务端(相当于心跳包),以便告诉服务端,客户端是存活的(因为服务端在一定时间内没收到来自客户端的消息,会自动关闭其之间的连接)。
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另外,在服务端与客户端push模式交互之前,客户端要访问服务,需要通过调用ServantProxy类的rpc相关函数。
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## 服务端功能的实现
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### 服务端实现概述
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首先我们按照第三方协议代码部署一个TestPushServant 服务
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如下图所示在管理平台部署一个服务端
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![tars](images/tars_push_deploy.PNG)
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参考tars 支持第三方协议
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- 其中TestPushServer类的initialize( ) 加载服务对象TestPushServantImp,并设置第三方协议解析器parse,这里解析器不做任何处理,把接收到的数据包原封不动的传给服务对象去处理(但通常情况下,要对数据进行解析后才交给服务对象去处理),
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- 而TestPushServantImp重载继承自Servant类的doRequest方法,该方法为第三方服务的协议处理器,该处理器负责处理协议解析器传送给其的数据,并负责生成返回给客户端的response(本服务为echo服务,因此直接让response等于收到的数据包),同时保存客户的信息状态,以便让pushThread线程对客户进行push消息;
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- 另外TestPushServantImp重载继承自Servant类的doClose方法,用于客户关闭连接或者连接超时后清除保存相关的客户信息。
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### 服务端代码实现
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TestPushServantImp.h
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```cpp
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#ifndef _TestPushServantImp_H_
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#define _TestPushServantImp_H_
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#include "servant/Application.h"
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//#include "TestPushServant.h"
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/**
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*
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*
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*/
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class TestPushServantImp : public tars::Servant
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{
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public:
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/**
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*
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*/
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virtual ~TestPushServantImp() {}
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/**
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*
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*/
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virtual void initialize();
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/**
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*
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*/
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virtual void destroy();
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/**
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*
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*/
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virtual int test(tars::TarsCurrentPtr current) { return 0;};
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//重载Servant的doRequest方法
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int doRequest(tars::TarsCurrentPtr current, vector<char>& response);
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//重载Servant的doClose方法
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int doClose(tars::TarsCurrentPtr current);
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};
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/////////////////////////////////////////////////////
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#endif
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```
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TestPushServantImp.cpp
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```cpp
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#include "TestPushServantImp.h"
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#include "servant/Application.h"
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#include "TestPushThread.h"
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using namespace std;
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//////////////////////////////////////////////////////
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void TestPushServantImp::initialize()
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{
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//initialize servant here:
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//...
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}
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//////////////////////////////////////////////////////
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void TestPushServantImp::destroy()
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{
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//destroy servant here:
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//...
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}
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int TestPushServantImp::doRequest(tars::TarsCurrentPtr current, vector<char>& response)
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{
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//保存客户端的信息,以便对客户端进行push消息
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(PushUser::mapMutex).lock();
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map<string, TarsCurrentPtr>::iterator it = PushUser::pushUser.find(current->getIp());
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if(it == PushUser::pushUser.end())
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{
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PushUser::pushUser.insert(map<string, TarsCurrentPtr>::value_type(current->getIp(), current));
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LOG->debug() << "connect ip: " << current->getIp() << endl;
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}
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(PushUser::mapMutex).unlock();
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//返回给客户端它自己请求的数据包,即原包返回
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const vector<char>& request = current->getRequestBuffer();
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response = request;
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return 0;
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}
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//客户端关闭到服务端的连接,或者服务端发现客户端长时间未发送包过来,然后超过60s就关闭连接
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//调用的方法
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int TestPushServantImp::doClose(TarsCurrentPtr current)
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{
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(PushUser::mapMutex).lock();
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map<string, TarsCurrentPtr>::iterator it = PushUser::pushUser.find(current->getIp());
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if(it != PushUser::pushUser.end())
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{
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PushUser::pushUser.erase(it);
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LOG->debug() << "close ip: " << current->getIp() << endl;
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}
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(PushUser::mapMutex).unlock();
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return 0;
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}
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```
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TestPushThread.h
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```cpp
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#ifndef __TEST_PUSH_THREAD_H
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#define __TEST_PUSH_THREAD_H
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#include "servant/Application.h"
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class PushUser
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{
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public:
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static map<string, TarsCurrentPtr> pushUser;
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static TC_ThreadMutex mapMutex;
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};
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class PushInfoThread : public TC_Thread, public TC_ThreadLock
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{
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public:
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PushInfoThread():_bTerminate(false),_tLastPushTime(0),_tInterval(10),_iId(0){}
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virtual void run();
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void terminate();
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void setPushInfo(const string &sInfo);
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private:
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bool _bTerminate;
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time_t _tLastPushTime;
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time_t _tInterval;
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unsigned int _iId;
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string _sPushInfo;
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};
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#endif
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```
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TestPushThread.cpp
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```cpp
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#include "TestPushThread.h"
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#include <arpa/inet.h>
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map<string, TarsCurrentPtr> PushUser::pushUser;
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TC_ThreadMutex PushUser::mapMutex;
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void PushInfoThread::terminate(void)
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{
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_bTerminate = true;
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{
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tars::TC_ThreadLock::Lock sync(*this);
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notifyAll();
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}
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}
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void PushInfoThread::setPushInfo(const string &sInfo)
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{
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unsigned int iBuffLength = htonl(sInfo.size()+8);
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unsigned char * pBuff = (unsigned char*)(&iBuffLength);
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_sPushInfo = "";
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for (int i = 0; i<4; ++i)
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{
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_sPushInfo += *pBuff++;
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}
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unsigned int iRequestId = htonl(_iId);
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unsigned char * pRequestId = (unsigned char*)(&iRequestId);
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for (int i = 0; i<4; ++i)
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{
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_sPushInfo += *pRequestId++;
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}
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_sPushInfo += sInfo;
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}
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//定期向客户push消息
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void PushInfoThread::run(void)
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{
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time_t iNow;
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setPushInfo("hello world");
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while (!_bTerminate)
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{
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iNow = TC_TimeProvider::getInstance()->getNow();
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if(iNow - _tLastPushTime > _tInterval)
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{
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_tLastPushTime = iNow;
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(PushUser::mapMutex).lock();
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for(map<string, TarsCurrentPtr>::iterator it = (PushUser::pushUser).begin(); it != (PushUser::pushUser).end(); ++it)
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{
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(it->second)->sendResponse(_sPushInfo.c_str(), _sPushInfo.size());
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LOG->debug() << "sendResponse: " << _sPushInfo.size() <<endl;
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}
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(PushUser::mapMutex).unlock();
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}
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{
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TC_ThreadLock::Lock sync(*this);
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timedWait(1000);
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}
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}
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}
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```
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TestPushServer.h
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```cpp
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#ifndef _TestPushServer_H_
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#define _TestPushServer_H_
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#include <iostream>
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#include "servant/Application.h"
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#include "TestPushThread.h"
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using namespace tars;
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/**
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*
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**/
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class TestPushServer : public Application
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{
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public:
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/**
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*
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**/
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virtual ~TestPushServer() {};
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/**
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*
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**/
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virtual void initialize();
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/**
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*
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**/
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virtual void destroyApp();
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private:
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//用于push消息的线程
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PushInfoThread pushThread;
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};
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extern TestPushServer g_app;
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////////////////////////////////////////////
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#endif
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```
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TestPushServer.cpp
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```cpp
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#include "TestPushServer.h"
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#include "TestPushServantImp.h"
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using namespace std;
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TestPushServer g_app;
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/////////////////////////////////////////////////////////////////
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static int parse(string &in, string &out)
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{
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if(in.length() < sizeof(unsigned int))
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{
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return TC_EpollServer::PACKET_LESS;
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}
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unsigned int iHeaderLen;
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memcpy(&iHeaderLen, in.c_str(), sizeof(unsigned int));
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iHeaderLen = ntohl(iHeaderLen);
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if(iHeaderLen < (unsigned int)(sizeof(unsigned int))|| iHeaderLen > 1000000)
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{
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return TC_EpollServer::PACKET_ERR;
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}
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if((unsigned int)in.length() < iHeaderLen)
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{
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return TC_EpollServer::PACKET_LESS;
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}
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out = in.substr(0, iHeaderLen);
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in = in.substr(iHeaderLen);
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return TC_EpollServer::PACKET_FULL;
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}
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void
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TestPushServer::initialize()
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{
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//initialize application here:
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//...
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addServant<TestPushServantImp>(ServerConfig::Application + "." + ServerConfig::ServerName + ".TestPushServantObj");
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addServantProtocol("Test.TestPushServer.TestPushServantObj", parse);
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pushThread.start();
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}
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/////////////////////////////////////////////////////////////////
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void
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TestPushServer::destroyApp()
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{
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//destroy application here:
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//...
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pushThread.terminate();
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pushThread.getThreadControl().join();
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}
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/////////////////////////////////////////////////////////////////
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int
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main(int argc, char* argv[])
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{
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try
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{
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g_app.main(argc, argv);
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g_app.waitForShutdown();
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}
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catch (std::exception& e)
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{
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cerr << "std::exception:" << e.what() << std::endl;
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}
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catch (...)
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{
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cerr << "unknown exception." << std::endl;
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}
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return -1;
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}
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/////////////////////////////////////////////////////////////////
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```
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## 客户端实现
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### 客户端实现概述
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本节介绍客户端通过proxy的方式来访问服务端,具体步骤如下:
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- 客户端首先建立通信器(Communicator _comm),并通过该通信器获取proxy,代码格式如下:
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```cpp
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string sObjName = "Test.TestPushServer.TestPushServantObj";
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string sObjHost = "tcp -h 10.120.129.226 -t 60000 -p 10099";
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_prx = _comm.stringToProxy<ServantPrx>(sObjName+"@"+sObjHost);
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```
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- 编写proxy的请求包的编码器和响应包的解码器并设置,代码格式如下:
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```
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请求包的编码器格式:
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static void FUN1(const RequestPacket& request, string& buff)
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响应包的解码器格式:
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static size_t FUN2(const char* recvBuffer, size_t length, list<ResponsePacket>& done)
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proxy设置代码为:
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ProxyProtocol prot;
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prot.requestFunc = FUN1;
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prot.responseFunc = FUN2 ;
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_prx->tars_set_protocol(prot);
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```
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- 同步方法或者异步方法访问服务端
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- 同步方法通过调用proxy的rpc_call方法访问服务
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```
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virtual void rpc_call(uint32_t requestId, const string& sFuncName,const char* buff, uint32_t len, ResponsePacket& rsp);
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```
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其中参数requestId需要在一个object内唯一,可以通过proxy的 uint32_t tars_gen_requestid()接口获得一个该object内唯一的id。sFuncName主要用于框架层对接口调用的统计分析,可以缺省为""。buff为要发送的内容,len为buff的长度。rsp则为本次调用得到的ResponsePacket包。
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- 异步方法通过调用proxy的rpc_call_asyc方法访问服务
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```
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virtual void rpc_call_async(uint32_t requestId, const string& sFuncName, const char* buff, uint32_t len, const ServantProxyCallbackPtr& callback);
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```
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其中参数requestId需要在一个object内唯一,可以通过proxy的 uint32_t tars_gen_requestid()接口获得一个该object内唯一的id。sFuncName为回调对象响应后调用的函数名。buff为要发送的内容,len为buff的长度。callback则为本次调用返回结果后,即服务端返回处理结果后,此回调对象会被响应。
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- 设置接受服务端的push消息方法:
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```
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TestPushCallBackPtr cbPush = new TestPushCallBack();
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_prx->tars_set_push_callback(cbPush);
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```
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### 客户端具体实现
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main.cpp
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```cpp
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#include "servant/Application.h"
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#include "TestRecvThread.h"
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#include <iostream>
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using namespace std;
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using namespace tars;
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int main(int argc,char**argv)
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{
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try
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{
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RecvThread thread;
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thread.start();
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int c;
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while((c = getchar()) != 'q');
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thread.terminate();
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thread.getThreadControl().join();
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}
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catch(std::exception&e)
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{
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cerr<<"std::exception:"<<e.what()<<endl;
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}
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catch(...)
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{
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cerr<<"unknown exception"<<endl;
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}
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return 0;
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}
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```
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TestRecvThread.h
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```
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#ifndef __TEST_RECV_THREAD_H
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#define __TEST_RECV_THREAD_H
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#include "servant/Application.h"
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class TestPushCallBack : public ServantProxyCallback
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{
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public:
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virtual int onDispatch(ReqMessagePtr msg);
|
||
};
|
||
typedef tars::TC_AutoPtr<TestPushCallBack> TestPushCallBackPtr;
|
||
|
||
class RecvThread : public TC_Thread, public TC_ThreadLock
|
||
{
|
||
public:
|
||
RecvThread();
|
||
|
||
virtual void run();
|
||
|
||
void terminate();
|
||
private:
|
||
bool _bTerminate;
|
||
|
||
Communicator _comm;
|
||
|
||
ServantPrx _prx;
|
||
};
|
||
#endif
|
||
|
||
```
|
||
TestRecvThread.cpp
|
||
```
|
||
#include "TestRecvThread.h"
|
||
#include <iostream>
|
||
#include <arpa/inet.h>
|
||
|
||
/*
|
||
响应包解码函数,根据特定格式解码从服务端收到的数据,解析为ResponsePacket
|
||
*/
|
||
static size_t pushResponse(const char* recvBuffer, size_t length, list<ResponsePacket>& done)
|
||
{
|
||
size_t pos = 0;
|
||
while (pos < length)
|
||
{
|
||
unsigned int len = length - pos;
|
||
if(len < sizeof(unsigned int))
|
||
{
|
||
break;
|
||
}
|
||
|
||
unsigned int iHeaderLen = ntohl(*(unsigned int*)(recvBuffer + pos));
|
||
|
||
//做一下保护,长度大于M
|
||
if (iHeaderLen > 100000 || iHeaderLen < sizeof(unsigned int))
|
||
{
|
||
throw TarsDecodeException("packet length too long or too short,len:" + TC_Common::tostr(iHeaderLen));
|
||
}
|
||
|
||
//包没有接收全
|
||
if (len < iHeaderLen)
|
||
{
|
||
break;
|
||
}
|
||
else
|
||
{
|
||
ResponsePacket rsp;
|
||
rsp.iRequestId = ntohl(*((unsigned int *)(recvBuffer + pos + sizeof(unsigned int))));
|
||
rsp.sBuffer.resize(iHeaderLen - 2*sizeof(unsigned int));
|
||
::memcpy(&rsp.sBuffer[0], recvBuffer + pos + 2*sizeof(unsigned int), iHeaderLen - 2*sizeof(unsigned int));
|
||
|
||
pos += iHeaderLen;
|
||
|
||
done.push_back(rsp);
|
||
}
|
||
}
|
||
|
||
return pos;
|
||
}
|
||
/*
|
||
请求包编码函数,本函数的打包格式为
|
||
整个包长度(字节)+iRequestId(字节)+包内容
|
||
*/
|
||
static void pushRequest(const RequestPacket& request, string& buff)
|
||
{
|
||
unsigned int net_bufflength = htonl(request.sBuffer.size()+8);
|
||
unsigned char * bufflengthptr = (unsigned char*)(&net_bufflength);
|
||
|
||
buff = "";
|
||
for (int i = 0; i<4; ++i)
|
||
{
|
||
buff += *bufflengthptr++;
|
||
}
|
||
|
||
unsigned int netrequestId = htonl(request.iRequestId);
|
||
unsigned char * netrequestIdptr = (unsigned char*)(&netrequestId);
|
||
|
||
for (int i = 0; i<4; ++i)
|
||
{
|
||
buff += *netrequestIdptr++;
|
||
}
|
||
|
||
string tmp;
|
||
tmp.assign((const char*)(&request.sBuffer[0]), request.sBuffer.size());
|
||
buff+=tmp;
|
||
}
|
||
|
||
static void printResult(int iRequestId, const string &sResponseStr)
|
||
{
|
||
cout << "request id: " << iRequestId << endl;
|
||
cout << "response str: " << sResponseStr << endl;
|
||
}
|
||
static void printPushInfo(const string &sResponseStr)
|
||
{
|
||
cout << "push message: " << sResponseStr << endl;
|
||
}
|
||
|
||
int TestPushCallBack::onDispatch(ReqMessagePtr msg)
|
||
{
|
||
if(msg->request.sFuncName == "printResult")
|
||
{
|
||
string sRet;
|
||
cout << "sBuffer: " << msg->response.sBuffer.size() << endl;
|
||
sRet.assign(&(msg->response.sBuffer[0]), msg->response.sBuffer.size());
|
||
printResult(msg->request.iRequestId, sRet);
|
||
return 0;
|
||
}
|
||
else if(msg->response.iRequestId == 0)
|
||
{
|
||
string sRet;
|
||
sRet.assign(&(msg->response.sBuffer[0]), msg->response.sBuffer.size());
|
||
printPushInfo(sRet);
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
cout << "no match func!" <<endl;
|
||
}
|
||
return -3;
|
||
}
|
||
|
||
RecvThread::RecvThread():_bTerminate(false)
|
||
{
|
||
string sObjName = "Test.TestPushServer.TestPushServantObj";
|
||
string sObjHost = "tcp -h 10.120.129.226 -t 60000 -p 10099";
|
||
|
||
_prx = _comm.stringToProxy<ServantPrx>(sObjName+"@"+sObjHost);
|
||
|
||
ProxyProtocol prot;
|
||
prot.requestFunc = pushRequest;
|
||
prot.responseFunc = pushResponse;
|
||
|
||
_prx->tars_set_protocol(prot);
|
||
}
|
||
|
||
void RecvThread::terminate()
|
||
{
|
||
_bTerminate = true;
|
||
{
|
||
tars::TC_ThreadLock::Lock sync(*this);
|
||
notifyAll();
|
||
}
|
||
}
|
||
|
||
void RecvThread::run(void)
|
||
{
|
||
TestPushCallBackPtr cbPush = new TestPushCallBack();
|
||
_prx->tars_set_push_callback(cbPush);
|
||
|
||
string buf("heartbeat");
|
||
|
||
while(!_bTerminate)
|
||
{
|
||
{
|
||
try
|
||
{
|
||
TestPushCallBackPtr cb = new TestPushCallBack();
|
||
_prx->rpc_call_async(_prx->tars_gen_requestid(), "printResult", buf.c_str(), buf.length(), cb);
|
||
}
|
||
catch(TarsException& e)
|
||
{
|
||
cout << "TarsException: " << e.what() << endl;
|
||
}
|
||
catch(...)
|
||
{
|
||
cout << "unknown exception" << endl;
|
||
}
|
||
}
|
||
|
||
{
|
||
TC_ThreadLock::Lock sync(*this);
|
||
timedWait(5000);
|
||
}
|
||
}
|
||
}
|
||
|
||
```
|
||
|
||
|
||
## 客户端测试结果
|
||
|
||
如果push 成功,结果如下
|
||
|
||
![tars](images/tars_result.PNG)
|
||
|
||
|
||
|
||
|
||
|
||
|