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POTwisted python: the correct way to pass a kwarg through the component system to a factory
 

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    <p>I need to pass a kwarg to the parent class of my equivalent of FingerFactoryFromService using super.</p> <p>I know I am actually passing the kwarg to IFingerFactory because that is also where I pass the service that ends up in <strong>init</strong> FingerFactoryFromService and I can understand that it is getting tripped up somewhere in the component system but I cannot think of any other way.</p> <p>The error I keep getting is </p> <pre><code>exceptions.TypeError: 'test' is an invalid keyword argument for this function </code></pre> <p>Versions of code in my virtualenv are:</p> <pre><code>pip (1.4.1) setuptools (1.1.6) Twisted (13.1.0) wsgiref (0.1.2) zope.interface (4.0.5) </code></pre> <p>This is a cutdown example from the finger tutorial demonstrating the issue:</p> <pre><code>from twisted.protocols import basic from twisted.application import internet, service from twisted.internet import protocol, reactor, defer from twisted.python import components from zope.interface import Interface, implements # @UnresolvedImport class IFingerService(Interface): def getUser(user): # @NoSelf """ Return a deferred returning a string. """ def getUsers(): # @NoSelf """ Return a deferred returning a list of strings. """ class IFingerFactory(Interface): def getUser(user): # @NoSelf """ Return a deferred returning a string. """ def buildProtocol(addr): # @NoSelf """ Return a protocol returning a string. """ def catchError(err): return "Internal error in server" class FingerProtocol(basic.LineReceiver): def lineReceived(self, user): d = self.factory.getUser(user) d.addErrback(catchError) def writeValue(value): self.transport.write(value + '\r\n') self.transport.loseConnection() d.addCallback(writeValue) class FingerService(service.Service): implements(IFingerService) def __init__(self, filename): self.filename = filename self.users = {} def _read(self): self.users.clear() for line in file(self.filename): user, status = line.split(':', 1) user = user.strip() status = status.strip() self.users[user] = status self.call = reactor.callLater(30, self._read) # @UndefinedVariable def getUser(self, user): print user return defer.succeed(self.users.get(user, "No such user")) def getUsers(self): return defer.succeed(self.users.keys()) def startService(self): self._read() service.Service.startService(self) def stopService(self): service.Service.stopService(self) self.call.cancel() class FingerFactoryFromService(protocol.ServerFactory): implements(IFingerFactory) protocol = FingerProtocol #def __init__(self, srv): def __init__(self, srv, test=None): self.service = srv ## I need to call super here because my equivalent of ServerFactory requires ## a kwarg but this cutdown example doesnt so I just assign it to a property # super(FingerFactoryFromService, self).__init__(test=test) self.test_thing = test or 'Default Something' def getUser(self, user): return self.service.getUser(user) components.registerAdapter(FingerFactoryFromService, IFingerService, IFingerFactory) application = service.Application('finger') serviceCollection = service.IServiceCollection(application) finger_service = FingerService('/etc/passwd') finger_service.setServiceParent(serviceCollection) #line_finger_factory = IFingerFactory(finger_service) line_finger_factory = IFingerFactory(finger_service, test='Something') line_finger_server = internet.TCPServer(1079, line_finger_factory) line_finger_server.setServiceParent(serviceCollection) </code></pre>
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