1. 基于上一篇文章(
用epoll实现一个异步处理的模型(1)),来继续实现一个tcp服务器。
(1)构造一个监听socket(socket-> bind-> listen),将监听socket的fd加入到epoll的监听中,等待客户端的连接。
(2)客户端连接后,调用OnFDRead(),得到客户端socket的fd,并将fd加入到epoll的监听中。
(3)处理客户端fd的读写事件。
2. 代码
点击(此处)折叠或打开 tcpeventhandler.h
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#pragma once
-
#include "reactor.h"
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#include <sys/types.h> /* See NOTES */
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#include <sys/socket.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <netinet/tcp.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdio.h>
-
-
class SocketDataDecoderBase
-
{
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public:
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virtual int OnProcess(FDEventHanderBase* pSocket, const char* buf,
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unsigned int buf_len) = 0;
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};
-
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/********************************
-
* 处理tcpServer事件的类
-
********************************/
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class TcpServerEventHandler: public FDEventHanderBase
-
{
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public:
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TcpServerEventHandler(const char* ip, int port, SocketDataDecoderBase* decoder,
-
int fd, Reactor* pReactor) :
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FDEventHanderBase(fd, pReactor), m_pDecoder(decoder)
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{
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memset(m_ip, 0x00, sizeof(m_ip));
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strncpy(m_ip, ip, strlen(ip));
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m_port = port;
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}
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virtual ~TcpServerEventHandler() {
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}
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// create listen socket. return 0, success.
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int OnListen();
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int OnAccept(int fd);
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// 当epoll中有新的连接过来的时候,就会调用该函数
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virtual void OnFDRead();
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virtual void OnFDWrite();
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virtual void Close();
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protected:
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char m_ip[16]; //ipv4
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int m_port;
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SocketDataDecoderBase* m_pDecoder;
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};
-
-
/* **************************
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* 处理TCP客户端发过来的数据
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* 这个地方,可以开辟2块缓冲区(读缓冲区和写缓冲区)
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* (1)读,当socket可读时,epoll会被触发,回调OnFDRead(),
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* 将读取到的数据进行处理,或者放到读缓冲区
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* (2)写,当有数据需要通过socket发出去时,先将数据放到写缓冲区中,
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* 注册RegisterWriteEvent,之后,OnFDWrite就会被回调,
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* 若LT模式,当数据没有写完时,OnFDWrite一直会被回调,直到写完后,
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* 用户调用UnRegisteWriteEvent.
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* ************************/
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class TcpSocketHandler: public FDEventHanderBase
-
{
-
public:
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TcpSocketHandler(SocketDataDecoderBase* decoder, int fd, Reactor* pReactor) :
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FDEventHanderBase(fd, pReactor), m_dataDecoder(decoder)
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{
-
-
}
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virtual ~TcpSocketHandler() {
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}
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// 读被触发时,调用该函数,处理客户端发过来的数据
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virtual void OnFDRead();
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// 写被触发时,调用该函数
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virtual void OnFDWrite();
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// 关闭fd
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virtual void Close();
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// 可以通过该函数,向客户端发送数据
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virtual int SendBuf(const char* buf, int buf_len);
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private:
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SocketDataDecoderBase* m_dataDecoder;
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//Buffer* pReadBuf;
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//Buffer* pWriteBuf;
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};
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/* *********************************
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* TcpServerBase类
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* *********************************/
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class TcpServerBase
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{
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public:
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TcpServerBase(const char* ip, int port, SocketDataDecoderBase* pDecoder)
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{
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memset(m_ip, 0x00, sizeof(m_ip));
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strncpy(m_ip, ip, strlen(ip));
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m_port = port;
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m_pReactor = NULL;
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m_pDecoder = pDecoder;
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}
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virtual int Init(){
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m_pReactor = new LTReactor;
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return m_pReactor->Init();
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}
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virtual int Run(){
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TcpServerEventHandler h(m_ip, m_port, m_pDecoder, 0, m_pReactor);
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if (0 == h.OnListen()) {
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m_pReactor->Run();
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}
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return 0;
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}
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virtual int Exit(){
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delete m_pReactor;
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return 0;
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}
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private:
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char m_ip[16];//ipv4
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int m_port;
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Reactor* m_pReactor;
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SocketDataDecoderBase* m_pDecoder;
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};
点击(此处)折叠或打开 tcpeventhandler.cpp
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#include "tcpeventhandler.h"
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/********************************
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* 处理tcpServer事件的类
-
********************************/
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// create listen socket. return 0, success.
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int TcpServerEventHandler::OnListen() {
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m_fd = ::socket(AF_INET, SOCK_STREAM, 0);
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if (m_fd == -1)
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{
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std::cout << "create socket error." << strerror(errno) << std::endl;
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return -1;
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}
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sockaddr_in addr;
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memset(&addr, 0x00, sizeof(sockaddr_in));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(m_port);
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socklen_t len = sizeof(sockaddr_in);
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if (1 != inet_pton(AF_INET, m_ip, &addr.sin_addr))
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{
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std::cout << "inet_pton error." << strerror(errno) << std::endl;
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close(m_fd);
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return -1;
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}
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// 允许在同一端口上启动同一服务器的多个实例
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int opVal = 1;
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if (0 != setsockopt(m_fd, SOL_SOCKET, SO_REUSEADDR, &opVal, sizeof(opVal)))
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{
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std::cout << "socketopt error." << strerror(errno) << std::endl;
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close(m_fd);
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return -1;
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}
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// 设置非阻塞模式
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SetNonBlock(m_fd, true);
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// bind
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if (-1 == bind(m_fd, (struct sockaddr*) &addr, len))
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{
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std::cout << "bind error." << strerror(errno) << std::endl;
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close(m_fd);
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return -1;
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}
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// listen
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if (-1 == listen(m_fd, 200))
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{
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std::cout << "listen error." << strerror(errno) << std::endl;
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close(m_fd);
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return -1;
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}
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// 将该fd加入到 epoll中,监听客户端的连接
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if (0 != RegisterReadEvent())
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{
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std::cout << "RegisterReadEvent error." << std::endl;
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close(m_fd);
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return -1;
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}
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return 0;
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}
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int TcpServerEventHandler::OnAccept(int fd) {
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TcpSocketHandler* pHandler = new TcpSocketHandler(m_pDecoder, fd,
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this->m_pReactor);
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// 注册一个读事件,从TCP的客户端读取数据.
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if (0 != pHandler->RegisterReadEvent())
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{
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pHandler->Close();
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delete pHandler;
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pHandler = NULL;
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}
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// 需要delete pHandler
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return 0;
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}
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// 当epoll中有新的连接过来的时候,就会调用该函数
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void TcpServerEventHandler::OnFDRead() {
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sockaddr_in clientAddr;
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socklen_t len = sizeof(clientAddr);
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// 客户端的fd,这个地方,其实可以建立一个(fd -- 客户端)对应关系
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int sockFD = accept(m_fd, (struct sockaddr*) &clientAddr, &len);
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if (sockFD < 0)
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{
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std::cout << "accept error." << std::endl;
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return;
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}
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else
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{
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int port = ntohs(clientAddr.sin_port);
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char addr[256] =
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{ 0 };
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inet_ntop(AF_INET, &clientAddr.sin_addr.s_addr, addr,
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(socklen_t) sizeof(addr));
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printf("accept: [%s:%d] \n", addr, port);
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}
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OnAccept(sockFD);
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}
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void TcpServerEventHandler::OnFDWrite() {
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}
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void TcpServerEventHandler::Close() {
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UnRegisterReadEvent();
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UnRegisterWriteEvent();
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close(m_fd);
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}
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/* ***********************
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* 处理TCP客户端发过来的数据
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* ************************/
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// 读被触发时,调用该函数,处理客户端发过来的数据
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void TcpSocketHandler::OnFDRead() {
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// 在这个函数中,可以读取客户端发过来的数据,并对数据进行分析,TCP的数据,
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// 可能会出现半包的情况,所以一般会有一个缓存来保存没有处理完毕的数据
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char buf[1024] =
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{ 0 };
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int iRet = read(m_fd, buf, sizeof(buf));
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if (0 == iRet)
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{
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Close();// 客户端关闭socket.
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return;
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}
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// 回调处理函数,对数据进行处理
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m_dataDecoder->OnProcess(this, buf, iRet);
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}
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// 写被触发时,调用该函数
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void TcpSocketHandler::OnFDWrite() {
-
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}
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// 关闭fd
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void TcpSocketHandler::Close() {
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UnRegisterReadEvent();
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UnRegisterWriteEvent();
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close(m_fd);
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delete this;
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}
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// 可以通过该函数,向客户端发送数据
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int TcpSocketHandler::SendBuf(const char* buf, int buf_len) {
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RegisterWriteEvent();
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int iRet = write(m_fd, buf, buf_len);
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UnRegisterWriteEvent();
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return iRet;
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}
3. 测试代码
测试代码实现了一个基本的tcp回显服务器。
简单的测试,可以在命令行,nc localhost 56893
,然后输入,就能够看到回显的效果。
-
#include "tcpeventhandler.h"
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/* *********************
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* 处理客户端发过来的数据
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* ********************/
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class TcpDataDecoder_echo_test: public SocketDataDecoderBase
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{
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public:
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// 真正的处理数据的函数
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virtual int OnProcess(FDEventHanderBase* pSocket, const char* buf,
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unsigned int buf_len)
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{
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// 这个地方,将客户端的数据回写
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if (0 == pSocket->RegisterWriteEvent())
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{
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write(pSocket->GetFD(), buf, buf_len);
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pSocket->UnRegisterWriteEvent();
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}
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return 0;
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}
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};
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-
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void TcpServer_test() {
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SocketDataDecoderBase* pDecoder = new TcpDataDecoder_echo_test;
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TcpServerBase b("127.0.0.1", 56893, pDecoder);
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b.Init();
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b.Run();
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b.Exit();
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delete pDecoder;
-
-
}
4. 一些需要注意的地方
(1)服务器端,最好设置tcp keepalive,在服务器与客户端之间,维持一个心跳连接。防止一些假死的客户端占用服务器端资源。【上面的代码中,并没有体现出来】
(2)由于服务器端的fd,是连续回收使用的,所以当close(fd) 后,需要将该fd的已经注册的读写handler,从EventHanderSet中删除掉。
(3)在epoll的LT模式下,在写之前,需要注册RegistReadEvent(),之后,该fd可以一直写。当写完后,需要调用UnRegisterReadEvent()。
(4)通常的接收和发送,是需要接收/发送缓存的,上面的代码中,并没有体现出来。
5. 同样的,可以使用unix_socket连接。
unix socket,用于同一主机上不同进程间的交互。通过socket文件进行交互。
点击(此处)折叠或打开 unixsocketeventhandler.h
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#pragma once
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-
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h> /* See NOTES */
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/un.h>
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#include <iostream>
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#include <errno.h>
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#include <sys/stat.h>
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#include "reactor.h"
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#include "SocketDataDecoderBase.h"
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#define MAX_PATH 256
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/* ********************************
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* 处理 unix socket server事件
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* ********************************/
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class UnixSocketServerEventHandler: public FDEventHanderBase
-
{
-
public:
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UnixSocketServerEventHandler(const char* path, SocketDataDecoderBase* decoder, int fd, Reactor* pReactor) :
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FDEventHanderBase(fd, pReactor), m_pDecoder(decoder)
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{
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assert(strlen(path) > 0);
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strncpy(m_path, path, sizeof(m_path));
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unlink(m_path);
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}
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~UnixSocketServerEventHandler() {
-
-
}
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// create unix socket. return 0, success.
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int OnListen();
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int OnAccept(int fd);
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// 读被触发时,调用该函数
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virtual void OnFDRead();
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// 写被触发时,调用该函数
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virtual void OnFDWrite() {
-
-
}
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// 关闭fd
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virtual void Close() {
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unlink(m_path);
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close(m_fd);
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}
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private:
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char m_path[MAX_PATH];
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SocketDataDecoderBase* m_pDecoder;
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};
-
-
/* ********************************
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* 处理 unix socket 客户端事件
-
* ********************************/
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class UnixSocketHandler: public FDEventHanderBase
-
{
-
public:
-
UnixSocketHandler(SocketDataDecoderBase* decoder, int fd, Reactor* pReactor) :
-
FDEventHanderBase(fd, pReactor), m_pDecoder(decoder)
-
{
-
-
}
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~UnixSocketHandler(){}
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virtual void OnFDRead();
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virtual void OnFDWrite();
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virtual void Close();
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virtual int SendBuf(const char* buf, int buf_len);
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private:
-
SocketDataDecoderBase* m_pDecoder;
-
};
-
-
/* *********************************
-
* UnixSocketServerBase类
-
* *********************************/
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class UnixSocketServerBase
-
{
-
public:
-
explicit UnixSocketServerBase(const char* path, SocketDataDecoderBase* pDecoder)
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{
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memset(m_path, 0x00, sizeof(m_path));
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strncpy(m_path, path, strlen(path));
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m_pReactor = NULL;
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m_pDecoder = pDecoder;
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}
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virtual int Init()
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{
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m_pReactor = new LTReactor;
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return m_pReactor->Init();
-
}
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virtual int Run()
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{
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UnixSocketServerEventHandler h(m_path, m_pDecoder, 0, m_pReactor);
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if (0 == h.OnListen())
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{
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m_pReactor->Run();
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}
-
-
return 0;
-
}
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virtual int Exit()
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{
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delete m_pReactor;
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return 0;
-
}
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private:
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UnixSocketServerBase(const UnixSocketServerBase&);
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const UnixSocketServerBase& operator=(const UnixSocketServerBase&);
-
private:
-
char m_path[MAX_PATH];
-
Reactor* m_pReactor;
-
SocketDataDecoderBase* m_pDecoder;
-
};
点击(此处)折叠或打开 unixsocketeventhandler.cpp
-
#include "unixsocketeventhandler.h"
-
-
// create unix socket. return 0, success.
-
int UnixSocketServerEventHandler::OnListen() {
-
m_fd = socket(AF_UNIX, SOCK_STREAM, 0);
-
if (m_fd == -1)
-
{
-
std::cout << "create socket error." << strerror(errno) << std::endl;
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return -1;
-
}
-
-
sockaddr_un addr;
-
memset(&addr, 0, sizeof(addr));
-
addr.sun_family = AF_UNIX;
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strcpy(addr.sun_path, m_path);
-
-
// 设置非阻塞模式
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SetNonBlock(m_fd, true);
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// 在bind的时候,会生成socket文件。
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socklen_t len = offsetof(struct sockaddr_un, sun_path)+strlen(addr.sun_path);
-
if (bind(m_fd, (struct sockaddr *) &addr, len) != 0)
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{
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std::cout << "unix socket bind error,path = " << m_path << std::endl;
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return -1;
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}
-
-
if (listen(m_fd, 500) != 0)
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{
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std::cout << "unix listen error" << std::endl;
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return -1;
-
}
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// 更改socket文件的访问权限.
-
if (0 != chmod(m_path, 0777))
-
{
-
std::cout << "chmod[777] " << m_path << "error " << strerror(errno)
-
<< std::endl;
-
return -1;
-
}
-
-
// 将该fd加入到 epoll中,监听客户端的连接
-
if (0 != RegisterReadEvent())
-
{
-
std::cout << "RegisterReadEvent error." << std::endl;
-
close(m_fd);
-
return -1;
-
}
-
return 0;
-
}
-
-
// 读被触发时,调用该函数
-
void UnixSocketServerEventHandler::OnFDRead() {
-
sockaddr_un clientAddr;
-
memset(&clientAddr, 0x00, sizeof(sockaddr_un));
-
socklen_t len = sizeof(clientAddr);
-
// 客户端的fd,这个地方,其实可以建立一个(fd -- 客户端)对应关系
-
int sockFD = accept(m_fd, (struct sockaddr*) &clientAddr, &len);
-
if (sockFD < 0)
-
{
-
std::cout << "accept error." << std::endl;
-
return;
-
}
-
else
-
{
-
len -= offsetof(struct sockaddr_un, sun_path);
-
clientAddr.sun_path[len] = 0;
-
std::cout << "accpet path = " << clientAddr.sun_path << std::endl;
-
}
-
-
OnAccept(sockFD);
-
}
-
-
int UnixSocketServerEventHandler::OnAccept(int fd) {
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SetNonBlock(fd, true);
-
UnixSocketHandler* pHandler = new UnixSocketHandler(m_pDecoder, fd,
-
this->m_pReactor);
-
if (pHandler == NULL)
-
{
-
return -1;
-
}
-
if (0 != pHandler->RegisterReadEvent())
-
{
-
pHandler->Close();
-
delete pHandler;
-
pHandler = NULL;
-
return -1;
-
}
-
return 0;
-
}
-
-
/* ********************************
-
* 处理 unix socket 客户端事件
-
* ********************************/
-
void UnixSocketHandler::OnFDRead() {
-
char buf[1024] =
-
{ 0 };
-
int iRet = read(m_fd, buf, sizeof(buf));
-
if (0 == iRet)
-
{
-
Close();// 客户端关闭socket.
-
return;
-
}
-
// 回调处理函数,对数据进行处理
-
m_pDecoder->OnProcess(this, buf, iRet);
-
}
-
-
void UnixSocketHandler::Close() {
-
UnRegisterReadEvent();
-
UnRegisterWriteEvent();
-
close(m_fd);
-
delete this;
-
}
-
-
void UnixSocketHandler::OnFDWrite() {
-
-
}
-
-
// 可以通过该函数,向客户端发送数据
-
int UnixSocketHandler::SendBuf(const char* buf, int buf_len) {
-
RegisterWriteEvent();
-
int iRet = write(m_fd, buf, buf_len);
-
UnRegisterWriteEvent();
-
return iRet;
-
}
点击(此处)折叠或打开 测试代码: unixsocketeventhandler_test.cpp
-
#include "unixsocketeventhandler.h"
-
-
-
class UnixSocketDataDecoder_echo_test: public SocketDataDecoderBase
-
{
-
public:
-
virtual int OnProcess(FDEventHanderBase* pSocket, const char* buf,
-
unsigned int buf_len)
-
{
-
std::cout << "RecvString: " << buf << std::endl;
-
return ((UnixSocketHandler*)pSocket)->SendBuf(buf, buf_len);
-
}
-
};
-
-
void UnixSocketEventHandler_test()
-
{
-
const char* path = "/home/ll/work/min_heap/unix_path.sock";
-
UnixSocketDataDecoder_echo_test* pDecoder = new UnixSocketDataDecoder_echo_test;
-
UnixSocketServerBase server(path, pDecoder);
-
server.Init();
-
server.Run();
-
server.Exit();
-
-
delete pDecoder;
-
pDecoder = NULL;
-
}
-
-
// 客户端测试程序
-
int f_unix_socket_client()
-
{
-
const char* path = "/home/ll/work/min_heap/unix_path.sock";
-
int sockFd = socket(AF_UNIX, SOCK_STREAM, 0);
-
if ( sockFd < 0 )
-
{
-
std::cout << "socket Error:" << strerror(errno) << std::endl;
-
return -1;
-
}
-
-
sockaddr_un server;
-
server.sun_family = AF_UNIX;
-
strcpy(server.sun_path, path);
-
// 直接去connect就好了,不需要再bind,否则会再生成一个socket文件。
-
int iRet = connect(sockFd, (struct sockaddr*) &server, sizeof(server));
-
if ( 0 != iRet )
-
{
-
std::cout << "connect Error:" << strerror(errno) << std::endl;
-
close(sockFd);
-
return 0;
-
}
-
while(true)
-
{
-
char inBuf[1024] = {0};
-
std::cin >> inBuf;
-
write(sockFd, inBuf, strlen(inBuf));
-
-
char outBuf[1024] = {0};
-
read(sockFd, outBuf, sizeof(outBuf));
-
std::cout << "Echo: " << outBuf << std::endl;
-
}
-
-
return 0;
-
}
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