python使用epoll实现的服务端例子

#!/usr/bin/python
# -*- coding: UTF-8 -*-
import socket
import select

send_data = "hello world!"
send_len = len(send_data)
recv_len = 1024
tcp_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:
4000

(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

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