【資料整理】Python-簡単なepoll serverコード解読
Pythonの初心者として、他人のコードを学ぶことも必要です.
Pythonではepollを用いてサービスエンドプログラムを開発する
』のコードで、ソースコードの注釈説明を行います.コードから少なくとも以下の3つの点を学ぶことができます. loggingモジュールの使用; epollの使用; tryの利用方法...catchは「読み書き」を処理します.
======================
serverエンドコード:
Clientエンドコード(比較的簡単で、コメントなし):
実行結果:
Clientコマンドライン出力.
Clientログファイル.
serverログファイル.
======================
原作者ありがとう!
Pythonではepollを用いてサービスエンドプログラムを開発する
』のコードで、ソースコードの注釈説明を行います.コードから少なくとも以下の3つの点を学ぶことができます.
======================
serverエンドコード:
#!/usr/bin/python
#-*- coding:utf-8 -*-
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:
# TCP socket socket
listen_fd = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
except socket.error, msg:
logger.error("create socket failed")
try:
# SO_REUSEADDR
listen_fd.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
except socket.error, msg:
logger.error("setsocketopt SO_REUSEADDR failed")
try:
# bind -- ip ， bind ip
listen_fd.bind(('', 2003))
except socket.error, msg:
logger.error("bind failed")
try:
# listen backlog
listen_fd.listen(10)
except socket.error, msg:
logger.error(msg)
try:
# epoll
epoll_fd = select.epoll()
# epoll socket
epoll_fd.register(listen_fd.fileno(), select.EPOLLIN)
except select.error, msg:
logger.error(msg)
connections = {}
addresses = {}
datalist = {}
while True:
# epoll fd --
epoll_list = epoll_fd.poll()
for fd, events in epoll_list:
# fd
if fd == listen_fd.fileno():
# accept -- client ip port， socket
conn, addr = listen_fd.accept()
logger.debug("accept connection from %s, %d, fd = %d" % (addr[0], addr[1], conn.fileno()))
# socket
conn.setblocking(0)
# epoll socket
epoll_fd.register(conn.fileno(), select.EPOLLIN | select.EPOLLET)
# conn addr
connections[conn.fileno()] = conn
addresses[conn.fileno()] = addr
elif select.EPOLLIN & events:
#
datas = ''
while True:
try:
# fd recv 10
data = connections[fd].recv(10)
# ，
if not data and not datas:
# epoll fd
epoll_fd.unregister(fd)
# server fd
connections[fd].close()
logger.debug("%s, %d closed" % (addresses[fd][0], addresses[fd][1]))
break
else:
# datas
datas += data
except socket.error, msg:
# socket recv
#
if msg.errno == errno.EAGAIN:
logger.debug("%s receive %s" % (fd, datas))
#
datalist[fd] = datas
# epoll d
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:
# HUP
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 buf
while True:
# client -- sendLen
sendLen += connections[fd].send(datalist[fd][sendLen:])
# while
if sendLen == len(datalist[fd]):
break
# epoll fd
epoll_fd.modify(fd, select.EPOLLIN | select.EPOLLET)
else:
# epoll
continueClientエンドコード(比較的簡単で、コメントなし):
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(("127.0.0.1", 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()実行結果:
Clientコマンドライン出力.
[root@Betty Python]# python epoll_client.py
The Number is 1
The Number is 2
The Number is 3
The Number is 4
The Number is 5
The Number is 6
The Number is 7
The Number is 8
The Number is 9
The Number is 10
[root@Betty Python]#Clientログファイル.
[root@Betty Python]# vi network-client.log
2013-07-26 15:36:43,995 - network-client - DEBUG - connect to network server successserverログファイル.
[root@Betty Python]# vi network-server.log
2013-07-26 15:36:43,995 - network-server - DEBUG - accept connection from 127.0.0.1, 34861, fd = 6
2013-07-26 15:36:43,995 - network-server - DEBUG - 6 receive The Number is 1
2013-07-26 15:36:44,996 - network-server - DEBUG - 6 receive The Number is 2
2013-07-26 15:36:45,996 - network-server - DEBUG - 6 receive The Number is 3
2013-07-26 15:36:46,996 - network-server - DEBUG - 6 receive The Number is 4
2013-07-26 15:36:47,996 - network-server - DEBUG - 6 receive The Number is 5
2013-07-26 15:36:48,997 - network-server - DEBUG - 6 receive The Number is 6
2013-07-26 15:36:49,998 - network-server - DEBUG - 6 receive The Number is 7
2013-07-26 15:36:50,999 - network-server - DEBUG - 6 receive The Number is 8
2013-07-26 15:36:52,000 - network-server - DEBUG - 6 receive The Number is 9
2013-07-26 15:36:53,001 - network-server - DEBUG - 6 receive The Number is 10
2013-07-26 15:36:54,002 - network-server - DEBUG - 127.0.0.1, 34861 closed======================
原作者ありがとう!