Python socket error: An object that is not a socket

Question

Here I am confused to initialize the socket when the instance is initialized, and I use it to transfer data through it in a loop.

class Server2:
    host = "localhost"
    port = 44444
    s = ""
    sock = ""
    addr = ""


    def __init__(self,voitingSistem,voitingInterfece,voiting,sql):
        self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.s.bind((self.host, self.port))
        self.s.listen(5)
        self.sock, self.addr =self.s.accept()
        self.client = WorkWithClient()
        self.voitingSistem = voitingSistem()
        self.voitingInterfece = voitingInterfece()
        self.voiting = Voiting("d")
        super().__init__()

     def mainLoop(self):
         while True:
             buf = self.sock.recv(1024) # receive and decode a command
             print("getting command: "+(buf.decode('utf8')))
             ansver = self.client.AcceptCommand(buf.decode('utf8')) # act upon the command

             if buf.decode('utf8') == "exit":
                 self.sock.send("bye")
                 break
             elif buf:
                 self.sock.send(buf)
                 print(buf.decode('utf8'))
                 self.sock.close()

Error:

An attempt was made to perform an operation on an object that is not a socket

The program receives the first data. But the next bit of data crashes with such a mistake. — Dmitry
– Dmitry, Commented Jul 30, 2017 at 16:53
Please indent your code correctly in the paste. (4 spaces missing before mainLoop). Also it will take the whole stacktrace to help you. — Julien Palard
– Julien Palard, Commented Jul 31, 2017 at 0:10

u354356007 · Accepted Answer · 2017-07-31 16:26:02Z

1

The following condition is always true and the code will always be executed unless buf is equal to exit:

elif buf:
    self.sock.send(buf)
    print(buf.decode('utf8'))
    self.sock.close()

Earlier in the code you obtain buf by calling self.sock.recv(1024). For a usual socket in blocking mode it will return at least one byte. There are no circumstances under which buf will be empty. Program execution will be simply blocked until some data arrives. If something really bad happens, like disconnect, you'll be notified by an exception, not by receiving an empty buffer.

So essentially you close a connection to a client after the first chunk of data is received. I believe you meant to have self.sock.close() in == 'exit' section.

answered Jul 31, 2017 at 16:26

u354356007

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