【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:

#!/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        
                continue

Client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 success

server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!