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Python Why is this String Sent Twice
  • Xin
    Posts: 3,251 
    import asyncore
    import socket

    class EchoHandler(asyncore.dispatcher_with_send):
        
        def handle_read(self):
            self.send('Welcome\r\n')
            data = self.recv(8192)
            if data == 'help':
                self.send('Commands:\r\nuser\r\npass\r\n')
            elif data == 'user':
                self.send('Login\r\n')
            else:
                self.send('Invalid Command\r\n')
                        
                          
                         

    class EchoServer(asyncore.dispatcher):

        def __init__(self, host, port):
            asyncore.dispatcher.__init__(self)
            self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
            self.set_reuse_addr()
            self.bind((host, port))
            self.listen(5)

        def handle_accept(self):
            pair = self.accept()
            if pair is None:
                pass
            else:
                sock, addr = pair
                print 'Incoming connection from %s' % repr(addr)
                handler = EchoHandler(sock)
                

    server = EchoServer('localhost', 8080)
    asyncore.loop()


    This is a multi user socket listener im trying to make, when i send something that calls the invalid command thing it returns two invalid commands eg

    >> tautat
    Invalid Command
    Invalid Command


    Can anyone help me find out why it does this?
    Xin
  • Sh3llc0d3
    Posts: 1,910
    I don't suppose you are using a client you've made? If you are can you post the source?... I don't know python but it could be an issue with the sending of the invalid command and it's sending it twice and returning the error twice...?
  • chroniccommand
    Posts: 1,389
    Hm I don't know much about asyncore. But I'll try and fix the code up for you and clean it up.

    import asyncore
    import socket

    class EchoHandler(asyncore.dispatcher_with_send):
        
        def HandleRead(self): #Changed handle_read to HandleRead. More pythonic
            self.send('Welcome\r\n')
            data = self.recv(8192)
            if data == 'help':
                self.send('Commands:\r\nuser\r\npass\r\n')
            elif data == 'user':
                self.send('Login\r\n')
            else:
                self.send('Invalid Command\r\n')
                        
                          
                        

    class EchoServer(asyncore.dispatcher):

        def __init__(self, host, port):
            asyncore.dispatcher.__init__(self)
            self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
            self.set_reuse_addr()
            self.bind((host, port))
            self.listen(5)

        def HandleAccept(self):
            pair = self.accept()
            if pair is None:
                pass
            else:
                sock, addr = pair
                print 'Incoming connection from %s' % repr(addr)
                handler = EchoHandler(sock)
                

    server = EchoServer('localhost', 8080)
    asyncore.loop()


    Where did you get this source from? Also could you explain what asyncore is?
  • Sh3llc0d3
    Posts: 1,910
    http://effbot.org/librarybook/asyncore.htm
    http://docs.python.org/library/asyncore.html
  • Xin
    Posts: 3,251
    Just using raw putty as client.
    Xin
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