Add a public API like twisted.internet.test.connectionmixins.serverFactoryFor

[exarkun]

These two lines are simple but typing them out gets tedious:

    factory = ServerFactory()
    factory.protocol = protocol

It would be nice to have this API provided by Twisted somewhere. Ideally it would just be ServerFactory(protocol), but ServerFactory has no __init__ and giving it one breaks this pattern:

class Foo:
    def __init__(self):
        self.stuff = things

class Bar(ServerFactory, Foo):
    pass

(since suddenly Bar.__init__ means ServerFactory.__init__ instead of Foo.__init__).

Perhaps we could add a class method, though. ServerFactory.forProtocol(protocol, *args, **kwargs).

Maybe this belongs on Factory rather than ServerFactory, too.

[Julian]

Here's a patch along with some changes in a few places that this cleans up a tiny bit.

[therve]

(In [37858]) Branching to 'factory-for-5016'

[therve]

Looks good, applying!

[therve]

(In [37864]) Merge factory-for-5016

Author: Julian Reviewer: therve Fixes: #5016

Add a forProtocol classmethod to factory to easily build a Factory instance for a protocol class.