Python中使用epoll开发服务端程序

这是个很简单的C/S模型的程序，流程其实和C语言相差不大，客户端发送字符串，服务端再将该字符串返回客户端，epoll中使用的边缘触发。

#服务端代码
import socket, logging
import select, errno
logger = logging.getLogger("network-server")
def InitLog():
logger.setLevel(logging.DEBUG)
fh = logging.FileHandler("network-server.log")
fh.setLevel(logging.DEBUG)
ch = logging.StreamHandler()
ch.setLevel(logging.ERROR)
formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
ch.setFormatter(formatter)
fh.setFormatter(formatter)
logger.addHandler(fh)
logger.addHandler(ch)
if __name__ == "__main__":
InitLog()
try:
listen_fd = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
except socket.error, msg:
logger.error("create a socket failed")
try:
listen_fd.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
except socket.error, msg:
logger.error("setsocketopt error")
try:
listen_fd.bind(('', 2003))
except socket.error, msg:
logger.error("listen file id bind ip error")
try:
listen_fd.listen(10)
except socket.error, msg:
logger.error(msg)
try:
epoll_fd = select.epoll()
epoll_fd.register(listen_fd.fileno(), select.EPOLLIN)
except select.error, msg:
logger.error(msg)
connections = {}
addresses = {}
datalist = {}
while True:
epoll_list = epoll_fd.poll()
for fd, events in epoll_list:
if fd == listen_fd.fileno():
conn, addr = listen_fd.accept()
logger.debug("accept connection from %s, %d, fd = %d" % (addr[0], addr[1], conn.fileno()))
conn.setblocking(0)
epoll_fd.register(conn.fileno(), select.EPOLLIN | select.EPOLLET)
connections[conn.fileno()] = conn
addresses[conn.fileno()] = addr
elif select.EPOLLIN & events:
datas = ''
while True:
try:
data = connections[fd].recv(10)
if not data and not datas:
epoll_fd.unregister(fd)
connections[fd].close()
logger.debug("%s, %d closed" % (addresses[fd][0], addresses[fd][1]))
break
else:
datas += data
except socket.error, msg:
if msg.errno == errno.EAGAIN:
logger.debug("%s receive %s" % (fd, datas))
datalist[fd] = datas
epoll_fd.modify(fd, select.EPOLLET | select.EPOLLOUT)
break
else:
epoll_fd.unregister(fd)
connections[fd].close()
logger.error(msg)
break
elif select.EPOLLHUP & events:
epoll_fd.unregister(fd)
connections[fd].close()
logger.debug("%s, %d closed" % (addresses[fd][0], addresses[fd][1]))
elif select.EPOLLOUT & events:
sendLen = 0
while True:
sendLen += connections[fd].send(datalist[fd][sendLen:])
if sendLen == len(datalist[fd]):
break
epoll_fd.modify(fd, select.EPOLLIN | select.EPOLLET)
else:
continue
#客户端程序,Python代码:
import socket
import time
import logging
logger = logging.getLogger("network-client")
logger.setLevel(logging.DEBUG)
fh = logging.FileHandler("network-client.log")
fh.setLevel(logging.DEBUG)
ch = logging.StreamHandler()
ch.setLevel(logging.ERROR)
formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
ch.setFormatter(formatter)
fh.setFormatter(formatter)
logger.addHandler(fh)
logger.addHandler(ch)
if __name__ == "__main__":
try:
connFd = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
except socket.error, msg:
logger.error(msg)
try:
connFd.connect(("192.168.31.226", 2003))
logger.debug("connect to network server success")
except socket.error,msg:
logger.error(msg)
for i in range(1, 11):
data = "The Number is %d" % i
if connFd.send(data) != len(data):
logger.error("send data to network server failed")
break
readData = connFd.recv(1024)
print readData
time.sleep(1)
connFd.close()

这个有一篇很权威的文章讲这个
http://scotdoyle.com/python-epoll-howto.html
附件

来源：oschina

链接：https://my.oschina.net/u/4000302/blog/3076335

标签

epoll

python