python使用epoll实现服务端的方法

如下所示：

#!/usr/bin/python# -*- coding: UTF-8 -*-import socketimport selectsend_data = "hello world!"send_len = len(send_data)recv_len = 1024tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)tcp_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)addr = ("0.0.0.0", 8765)tcp_socket.bind(addr)tcp_socket.listen(5)tcp_socket.setblocking(False)epoll = select.epoll()'''(边缘触发)select.EPOLLIN | select.EPOLLET'''epoll.register(tcp_socket.fileno(), select.EPOLLIN)'''因为epoll返回的触发事件对应的是套接字文件描述符，所以需要在字典中加入对应关系'''fd_to_socket = {tcp_socket.fileno():tcp_socket}while True : events = epoll.poll(-1) for fd, event in events:  fd_socket = fd_to_socket[fd]  if fd == tcp_socket.fileno():   while True:    try:     new_socket, new_addr = fd_socket.accept()    except socket.error as e:     (errno, err_msg) = e     print errno     print err_msg     if errno == 11:      break    print "new accpet:", new_addr    new_socket.setblocking(False)    new_socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)    epoll.register(new_socket.fileno(), select.EPOLLIN)    fd_to_socket[new_socket.fileno()] = new_socket  elif event&select.EPOLLIN:   recv_datas = []   recd = 0   while (recd < recv_len):    try:     recv_data = fd_socket.recv(recv_len - recd)     '''处理读的正常关闭'''     if recv_data == "":      print "close socket"      epoll.unregister(fd)      fd_to_socket[fd].close()      del fd_to_socket[fd]      break     else:      recv_datas.append(recv_data)      recd = recd + len(recv_data)    '''处理异常关闭(EAGAIN,EINTR)'''    except socket.error as e:     (errno, err_msg) = e     print errno     print err_msg     '''因为用的水平触发，EAGAIN我们跳出循环，等待下次触发再读就好了'''     if errno == 11:      break     '''软中断打断了还要继续读'''     elif errno == 4:      continue     '''其它错误我们直接关闭套接字'''     else:      print "close socket"      epoll.unregister(fd)      fd_to_socket[fd].close()      del fd_to_socket[fd]      break    print repr(recv_datas)    total_send = 0    while total_send < send_len:     sent = fd_socket.send(send_data[total_send:])     if sent == 0:      print "close socket"      epoll.unregister(fd)      fd_to_socket[fd].close()      del fd_to_socket[fd]      break     else:      print repr(send_data[total_send:])      total_send = total_send + sent

其实这里的异常处理我们也可以用

except IOError as e:  print e.errno  print e.strerror

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