对于内网服务器的通信采用zmq来进行，对于和客户端的通信采用boost的asio来。这里先来搭建zmq的基础结构。
zmq相关的知识可以去zmq官方网站查询。
这里使用zmq的push 和pull来进行通信。
先放一张结构图：
其中PushZmq是推管道， PullZmq是拉管道：
对于Push的流程是：
zmq_init()----> zmq_socket()---->zmq_connect()---->zmq_init_size()----->zmq_init_data--->zmq_send()--->zmq_msg_close()--->zmq_close()---->zma_term()
具体见代码：
PushZmq.h
#ifndef __PUSH_ZMQ_H__
#define __PUSH_ZMQ_H__
#include <zmq.h>
#include <string.h>
#include <iostream>
#include <glog/logging.h>
using namespace std;
class PushZmq
{
public:
PushZmq(const char* url, void* zmqContext = NULL);
~PushZmq();
size_t Send(const char* buffer, size_t length);
private:
string _strUrl;
void* _ctx;
void* _socket;
};
#endif
PushZmq.cpp
#include "pushZmq.h"
#include "proto/hello.pb.h"
using namespace hello;
int main()
{
FLAGS_minloglevel = google::INFO;
google::InitGoogleLogging("");
google::SetLogDestination(google::INFO, "../");
google::SetLogFilenameExtension("log_");
google::LogToStderr();
string url = "tcp://127.0.0.1:5555";
PushZmq* push = new PushZmq(url.c_str());
//string sendContent = "Hello Pull.I am From Push!";
PbMsgHello helloMsg;
helloMsg.set_helloint(123456);
helloMsg.set_hellostring("ni hao wang peng ");
int length = helloMsg.ByteSize();
char* buffer = (char*)malloc(length);
helloMsg.SerializeToArray(buffer, length);
push->Send(buffer, length);
free(buffer);
return 0;
}
PushZmq::PushZmq( const char* url, void* zmqContext /*= NULL*/ )
:_strUrl(url)
,_ctx(zmqContext)
{
if(!_ctx)
{
_ctx = zmq_init(1);
}
_socket = zmq_socket(_ctx, ZMQ_PUSH);
if(!_socket)
{
cout << "Error int zmq_socket:" << zmq_strerror(errno) << endl;
return;
}
int rc = zmq_connect(_socket, _strUrl.c_str());
if(rc != 0 )
{
cout << "error in zmq_connect:" << zmq_strerror(errno) << endl;
return;
}
}
PushZmq::~PushZmq()
{
zmq_close(_socket);
zmq_term(_ctx);
}
size_t PushZmq::Send( const char* buffer, size_t length )
{
zmq_msg_t msg;
int rc = zmq_msg_init_size(&msg, length);
memcpy((char*)zmq_msg_data(&msg), buffer, length);
rc = zmq_send(_socket, &msg, ZMQ_NOBLOCK);
if(rc < 0)
{
cout << "error in zmq_send:" << zmq_strerror(errno) << endl;
zmq_msg_close(&msg);
return -1;
}
zmq_msg_close(&msg);
LOG(INFO) << "Send Hello success: rc=" << rc;
return rc;
}
对于Pull的流程是：
zmq_init()--->zmq_socket()--->zmq_bind()--->zmq_poll--->zmq_msg_init()---->zmq_recv()--->zmq_msg_data()--->zmq_msg_size()-------调用具体处理函数--->zmq_close-->zmq_msg_close--->zmq_close()--->zmq_term
PullZmq.h
#ifndef __PULL_ZMQ_H__
#define __PULL_ZMQ_H__
#include <zmq.h>
#include <iostream>
#include <string.h>
#include <glog/logging.h>
#include <boost/bind.hpp>
#include <boost/function.hpp>
using namespace std;
class PullZmq
{
public:
typedef boost::function<bool(const char*, size_t)> TypeOnMessage;
PullZmq(const char* url, TypeOnMessage onPipeMessage, void* zmqContext=NULL);
~PullZmq();
void Run();
private:
void* _ctx;
string _strUrl;
void* _socket;
TypeOnMessage _onMessage;
};
#endif
PullZmq.Cpp:
#include "PullZmq.h"
#include "proto/hello.pb.h"
using namespace hello;
bool TestOnMessage( const char* buffer, size_t length );
int main()
{
FLAGS_minloglevel = google::INFO;
google::InitGoogleLogging("");
google::SetLogDestination(google::INFO, "../");
google::SetLogFilenameExtension("log_");
google::LogToStderr();
string url = "tcp://*:5555";
PullZmq* pull = new PullZmq(url.c_str(),
boost::bind(TestOnMessage, _1, _2));
pull->Run();
return 0;
}
PullZmq::PullZmq( const char* url, TypeOnMessage onPipeMessage, void* zmqContext )
:_strUrl(url)
,_onMessage(onPipeMessage)
, _ctx(zmqContext)
{
if(!_ctx)
{
_ctx = zmq_init(1);
if(!_ctx)
{
cout << "error in zmq_init:" << zmq_strerror(errno) << endl;
return;
}
}
_socket = zmq_socket(_ctx, ZMQ_PULL);
if (!_socket)
{
LOG(ERROR) << "Error in zmq_socket:" << zmq_strerror(errno);
return;
}
int rc = zmq_bind(_socket, url);
if(rc != 0)
{
LOG(ERROR) << "error in zmq_bind:" << zmq_strerror(errno);
return;
}
}
PullZmq::~PullZmq()
{
int rc = zmq_close(_socket);
if(rc != 0)
{
LOG(ERROR) << "error in zmq_close:" << zmq_strerror(errno);
}
rc = zmq_term(_ctx);
if(rc !=0 )
{
LOG(ERROR) << "error in zmq_term:" << zmq_strerror(errno);
}
}
void PullZmq::Run()
{
zmq_pollitem_t item;
item.socket = _socket;
item.events = ZMQ_POLLIN;
long pollWaitTime = 1000;
bool bLoop = true;
while(bLoop)
{
int rc = zmq_poll(&item, 1, -1);
if(rc < 0)
{
LOG(ERROR) << "error in zmq_poll:" << zmq_strerror(errno);
}else if(rc ==0)
{
//LOG(ERROR) << "On Idle!";
}else
{
int msgCount = rc;
while(msgCount--)
{
zmq_msg_t msg;
rc = zmq_msg_init(&msg);
if (rc !=0 )
{
LOG(ERROR) << "error in zmq_msg_init:" << zmq_strerror(errno);
return;
}
rc = zmq_recv(_socket, &msg, 0);
if(rc != 0)
{
LOG(ERROR) << "error in zmq_recv:" << zmq_strerror(errno);
zmq_msg_close(&msg);
continue;
}
void* buffer = zmq_msg_data(&msg);
size_t len = zmq_msg_size(&msg);
bLoop = _onMessage((const char*)buffer, len);
zmq_msg_close(&msg);
}
}
}
}
bool TestOnMessage( const char* buffer, size_t length )
{
LOG(INFO) << "TestOnMessage:";
PbMsgHello helloMsg;
helloMsg.ParseFromArray(buffer, length);
LOG(INFO) << " helloInt = " << helloMsg.helloint()
<< " helloString = " << helloMsg.hellostring();
//string content;
//content.append(buffer);
//LOG(INFO) << "buffer = " << content << " length = " << length;
return true;
}
对应Makefile为：
all: pull push hello.o: g++ -c -o hello.o proto/hello.pb.cc pull: hello.o g++ -o pullZmq hello.o PullZmq.cpp -lzmq -lglog -lboost_filesystem -lprotobuf push: hello.o g++ -o pushZmq hello.o PushZmq.cpp -lzmq -lglog -lboost_filesystem -lprotobuf clean: rm -rf *.o rm -rf pullZmq rm -rf pushZmq
对于上文的cpp中，开启了Protobuffer的 因此需要导入protobuffer的支持，对应proto文件
hello.proto为：
package hello;
message PbMsgHello
{
required string helloString = 1;
required int32 helloInt =2;
}
运行以上cpp 可以实现 在push端包装一个Protobuffer的Message 在序列化之后Push到Pull端， Pull端接受到消息后进行解析 并读Message中的内容。
结果如下：
pull端：
Push端：
可见在Push端组装的 int 和string 在pull端成功解析。
下一步应该进行Message的包装，以及ProtoBuffer的反射解析。即根据类型来自动生成解析所需的Message类型。
1-6章节对于源码下载：http://download.csdn.net/detail/jcracker/6267125