python之tcp自动重连

python之tcp自动重连

操作系统： CentOS 6.9_x64

python语言版本： 2.7.13

问题描述

现有一个tcp客户端程序，需定期从服务器取数据，但由于种种原因（网络不稳定等）需要自动重连。

测试服务器示例代码：

https://github.com/mike-zhang/pyExamples/blob/master/socketRelate/tcpServer1_multithread.py

解决方案

'''
tcp client with reconnect
E-Mail : Mike_Zhang@live.com
'''

#! /usr/bin/env python
#-*- coding:utf-8 -*-

import os,sys,time
import socket

def doConnect(host,port):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try :
        sock.connect((host,port))
    except :
        pass
    return sock

def main():
    host,port = "127.0.0.1",12345
    print host,port
    sockLocal = doConnect(host,port)

    while True :
        try :
            msg = str(time.time())
            sockLocal.send(msg)
            print "send msg ok : ",msg
            print "recv data :",sockLocal.recv(1024)
        except socket.error :
            print "
socket error,do reconnect "
            time.sleep(3)
            sockLocal = doConnect(host,port)
        except :
            print '
other error occur '
            time.sleep(3)
        time.sleep(1)

if __name__ == "__main__" :
    main()

运行效果：

(py27env) [root@local t1]# python tcpClient1_reconnect.py
127.0.0.1 12345
send msg ok :  1498891374.98
recv data : 1498891374.98
send msg ok :  1498891375.98
recv data : 1498891375.98
send msg ok :  1498891376.98
recv data :

socket error,do reconnect
send msg ok :  1498891381.99
recv data : 1498891381.99
send msg ok :  1498891382.99
recv data : 1498891382.99

讨论

这里只是个简单的示例代码，实现了python的tcp自动重连。

好，就这些了，希望对你有帮助。

本文github地址：

https://github.com/mike-zhang/mikeBlogEssays/blob/master/2017/20170701_python之tcp自动重连.rst

python socket [Errno 10054]的解决方法

 

 

在写一个传输文件的socket程序时，客户端实现了和服务端断开连接后重新自动连接功能，但是连接上服务端后再重启服务端，客户端出现了Errno 10054异常。出错的代码如下：

client.py:

import socket

ip = '192.168.0.124'
port = 8000
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

def run():
    while True:
        try:
            s.connect((ip, port))
            # do something:send, recv
        except socket.error, e:
            print "get connect error as", e
            continue
    s.close()
    
if __name__ == '__main__':
    run()

解决方案：调整 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)语句的位置，每次重新连接都生成新的socket实例。

client.py:

import socket

ip = '192.168.0.124'
port = 8000

def run():
    while True:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        try:
            s.connect((ip, port))
            # do something:send, recv
        except socket.error, e:
            print "get connect error as", e
            continue
    s.close()

if __name__ == '__main__':
    run()