CODEWITHSUNDEEP
pythonmultithreadingsockets
MD RAIHAN WALI
MD RAIHAN WALI

Reputation: 1

Socket programming in Python error: "group argument must be None for now" and "SocketErr Errno. 111"

I am trying to implement socket programming using Python.

server.py

import socket
from threading import Thread
try:
    from SocketServer import ThreadingMixIn, ForkingMixIn
    from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
except ImportError:
    from socketserver import ThreadingMixIn, ForkingMixIn
    from http.server import HTTPServer, BaseHTTPRequestHandler



#from SocketServer import ThreadingMIxIn
class ClientThread(Thread):

    def _init_(self,ip,port):
        Thread._init_(self)
        self.ip=ip
        self.port= port
        print ("[+] New server socket thread started for " + + ":" + str(port))

    def run(self):
        while True :
            data = conn.recv(2048)
            print ("Server received data:", data)
            MESSAGE = raw_input("Multithreaded Python Server : Enter response from sever Enter exit:")

            if MESSAGE == 'exit' :
        #break
                conn.send(MESSAGE) 


TCP_IP ='0.0.0.0'
TCP_PORT = 2024
BUFFER_SIZE = 20

tcpServer = socket.socket()
tcpServer.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
tcpServer.bind((TCP_IP,TCP_PORT))
threads=[]


while True:
    tcpServer.listen(4)
    print ("Multithreaded python server: Waiting for connections from tcp clients...")
    (conn ,(ip,port)) = tcpServer.accept()
    newthread=ClientThread(ip,port)
    newthread.start()
    threads.append(newthread)


for t in threads:
    t.join() #end

client.py

import socket

host=socket.gethostname()
port=2024
BUFFER_SIZE= 2000
MESSAGE = raw_input("tcpClientB: Enter message / Enter exit:")

tcpClientB =socket.socket()
tcpClientB.connect((host, port))

while MESSAGE !='exit':
    tcpClientB.send(MESSAGE)
    data=tcpClientB.recv(BUFFER_SIZE)
    print ("Client received data",data)
    MESSAGE=raw_input("tcpClientB: Enter message to continue/ Enter exit:")

tcpClientB.close()

When I am trying to run this, first server.py and then client.py, I get this error for server.py

Multithreaded python server: Waiting for connections from tcp clients...
Traceback (most recent call last):
  File "mserver.py", line 47, in <module>
    newthread=ClientThread(ip,port)
  File "/usr/lib/python2.7/threading.py", line 670, in __init__
    assert group is None, "group argument must be None for now"
AssertionError: group argument must be None for now

and the following error from client.py:

python client2.py 
tcpClientB: Enter message / Enter exit:exit
Traceback (most recent call last):
  File "mclient2.py", line 10, in <module>
    tcpClientB.connect((host, port))
  File "/usr/lib/python2.7/socket.py", line 228, in meth
    return getattr(self._sock,name)(*args)
socket.error: [Errno 111] Connection refused

I don't understand what I am doing wrong. And when I am entering exit in client after running it gives me SocketErr Errno. 111.

Upvotes: 0

Views: 2804

Answers (1)

Zaboj Campula
Zaboj Campula

Reputation: 3360

The errno 111 means 'connection refused'. The server refuses the connection because it crashes due to error in the Thread constructor call. The constructor in python is __init__ (double double underscore).

Your program just defines a method init instead of constructor and the first argument of Thread constructor is a group.

Change your server to

def __init__(self,ip,port):
        Thread.__init__(self)

Upvotes: 1

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