python socket server 判断断开_如果服务器关闭连接，Python客户端将断开连接

I have server and client code in python in which client sends a request message to server and wait for the response. I have the server code to close the connection when the client doesn't send a proper request. When the server closes the request, the client still is listening forever for the response.

Below is the code

server.py

s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

s.bind((host, port))

s.listen(1)

while True:

c, addr = s.accept()

# Receive request

data = c.recv(1024)

if data != 'something'

c.close()

else

c.sendall("message"+"End")

c.close()

s.close()

Client.py

End='End'

def recv_end(the_socket):

# Snippet from http://code.activestate.com/recipes/408859-socketrecv-three-ways-to-turn-it-into-recvall/

total_data=[];data=''

while True:

data=the_socket.recv(8192)

if End in data:

total_data.append(data[:data.find(End)])

break

total_data.append(data)

if len(total_data)>1:

#check if end_of_data was split

last_pair=total_data[-2]+total_data[-1]

if End in last_pair:

total_data[-2]=last_pair[:last_pair.find(End)]

total_data.pop()

break

return ''.join(total_data)

s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

s.connect((host, port))

s.send("some_request")

data = s.recv_end(1024)

print "

s.close()

I'm new to python and wondering if there is a way for the client to know that the server closed the connection and terminate.

I understand that the client would disconnect if I use normal s.recv(1024). But in my case, I need to send large data to the client so I have used a different function I found from http://code.activestate.com/recipes/408859-socketrecv-three-ways-to-turn-it-into-recvall/.

Is it like the server sends a empty string reply during the close of a connection and in my case, it would send a empty string without the end limiter and hence the client is listening forever ?

解决方案

When you have a loop with recv or anything that reads from a socket or a pipe, you should stop reading as soon as you get a buffer with len 0 :

while True:

data=the_socket.recv(8192)

if len(data) == 0: break

...