Python Tcp断开检测

Question

我有一个simpletcp示例:

import socket
import time


TCP_IP = '127.0.0.1'
TCP_PORT = 81
BUFFER_SIZE = 1024

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))

while True:
    s.send(bytes('hello', 'UTF-8'))
    time.sleep(1)

s.close()

如果我丢失了与服务器的连接,我该如何检测,以及如何安全地重新连接呢？

是否有必要等待服务器的答案？

更新:

import socket
import time

TCP_IP = '127.0.0.1'
TCP_PORT = 81
BUFFER_SIZE = 1024

def reconnect():
    toBreak = False
    while True:
        s.close()
        try:
            s.connect((TCP_IP, TCP_PORT))
            toBreak = True
        except:
            print ("except")        
        if toBreak:
            break
        time.sleep(1)


s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))

while True:
    try:    
        s.send(bytes('hello', 'UTF-8'))
        print ("sent hello")
    except socket.error as e:
        reconnect()

    time.sleep(1)

s.close()

如果我断开连接,它会引发错误(并不重要),然后进入重新连接循环.但在我恢复连接后,连接会返回此错误:

OSError:[WinError 10038]尝试对非套接字的操作进行操作

如果我重新启动调用相同s.connect((TCP_IP,TCP_PORT))的脚本,它可以正常工作.

Answer 1

在任何调用或连接丢失或断开连接时,您将获得socket.error:[Errno 104] Connection reset by peerexception(aka ECONNRESET).所以为了检测它,只需捕获该异常:send()recv()

while True:
    try:
        s.send(bytes('hello', 'UTF-8'))
    except socket.error, e:
        if e.errno == errno.ECONNRESET:
            # Handle disconnection -- close & reopen socket etc.
        else:
            # Other error, re-raise
            raise
    time.sleep(1)