CODEWITHSUNDEEP
pythonsocketsloggingexceptiondisconnect
Mike111177
Mike111177

Reputation: 25

How to detect disconnection in python, without sending data

Ok, I have a socket and I'm handling one line at a time and logging it. The code below works great for that. The cout function is what I use to send data to the log. The for loop I use so I can process one line at a time.

socket.connect((host, port))
readbuffer = ""
while True:
    readbuffer = readbuffer+socket.recv(4096).decode("UTF-8")
    cout("RECEIVING: " + readbuffer) #Logs the buffer
    temp = str.split(readbuffer, "\n")
    readbuffer=temp.pop( )
    for line in temp:
        #Handle one line at a time.

The I ran into a problem where when the server disconnected me, all of the sudden I had a massive file full of the word "RECEIVING: ". I know this is because when a python socket disconnects the socket starts receiving blank data constantly.

I have tried inserting:

if "" == readbuffer:
    print("It disconnected!")
    break

All that did was immediately break the loop, and say that it disconnected, even on a successful connection.

I also know that I can detect a disconnection by sending data, but I can't do that, because anything I send gets broadcasted to all the other clients on the server, and this is meant to debug those clients so I it would interfere.

What do I do. Thank you in advanced.

Upvotes: 2

Views: 3808

Answers (1)

Tris Forster
Tris Forster

Reputation: 162

You need to check the result of the recv() separately to the readbuffer

while True:
  c = socket.recv(4096)
  if c == '': break # no more data
  readbuffer = readbuffer + c.decode("UTF-8")
  ...

Upvotes: 2

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