Python threads passing parameters

Question

I'm trying to passing some parameter to the server tread, but I have no idea how?

this is my code:

HOST, PORT = socket.gethostbyname( socket.gethostname() ), 31000
self.server = SocketServer.ThreadingTCPServer( ( HOST, PORT ), MCRequestHandler )
ip, port = self.server.server_address        
self.server_thread = threading.Thread( target = self.server.serve_forever )

this is the MCRequestHandler

class MCRequestHandler( SocketServer.BaseRequestHandler ):

    global Lidars, clientsLock, postbox
    Lidars = []
    postbox = {}
    clientsLock = threading.RLock()    

    def setup( self ):
        clientsLock.acquire()

How can I pass one or two parameter to the MCRequestHandler class?

Mikko Ohtamaa · Accepted Answer · 2011-06-17 19:15:41Z

3

I think the second parameter of ThreadingTCPServer is a factory:

  SocketServer.ThreadingTCPServer( ( HOST, PORT ), MCRequestHandler )

What you could do is your own factory here. Class will contstuct a callable object. when the object is called it will initialize MCRequestHandler with parameters given to the factory:

class MyRequestHandlerFactory(object):

  def __init__(self, param1, param2): 
            self.param1 = param1
            self.param2 = param2

  def __call__(self):
            handler = MCRequestHandler()
            handler.param1 = param1
            handler.param2 = param2

Then initialize:

  factory = MyRequestHandlerFactory("x", "y")
  SocketServer.ThreadingTCPServer( ( HOST, PORT ), factory)

answered Jun 17, 2011 at 19:15

Mikko Ohtamaa

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5 Comments

cangrejo Over a year ago

I did this, but get this error. TypeError: __call__() takes 1 positional argument but 4 were given. Does anyone know what could be the reason?

jfs Over a year ago

@bronco: try this signature def __call__(self, *args, **kwargs) and pass the args to the handler transparently: YourRequestHandler(*args, **kwargs)

cangrejo Over a year ago

If I do that I get ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host

jfs Over a year ago

@broncoAbierto: add return handler to the __call__.

cangrejo Over a year ago

@J.F. Sebastian Still complaining about the arg count (takes 3, 4 given). I find threading in this ServerSocket framework a little weird. I'm gonna go with Twisted, I think.

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