Added response callback to HubServer's invoke().

[Evolver]

Added response callback support to HubServer's invoke() function. Usage:

def ProcessResponse( **kwargs ):
    print "Response:", repr( kwargs )
myHub.server.invoke( "DoSomethingAndSendResponse", "arg1", "arg2", response = ProcessResponse )

[gabrielgrant]

Would very much like to see this land. @u-abramchuk are you still using/maintaining this at all?

[gabrielgrant]

I believe the reply is, in the general case, just a single value that should be passed directly to the function as a single parameter, not unfurled as kwargs. ie:

rspArg = kwargs['R'] if 'R' in kwargs else None 
rspHandlers[callId](rspArgs)

As it stands today, I'm getting errors from methods that don't return dicts:

Traceback (most recent call last):
  File "/home/gabriel/repos/coinbot/env/local/lib/python2.7/site-packages/gevent/greenlet.py", line 536, in run
    result = self._run(*self.args, **self.kwargs)
  File "/home/gabriel/repos/bot/env/local/lib/python2.7/site-packages/signalr/_connection.py", line 53, in wrapped_listener
    listener()
  File "/home/gabriel/repos/bot/env/local/lib/python2.7/site-packages/signalr/transports/_ws_transport.py", line 43, in _receive
    self._handle_notification(notification)
  File "/home/gabriel/repos/bot/env/local/lib/python2.7/site-packages/signalr/transports/_transport.py", line 50, in _handle_notification
    self._connection.received.fire(**data)
  File "/home/gabriel/repos/bot/env/local/lib/python2.7/site-packages/signalr/events/_events.py", line 15, in fire
    handler(*args, **kwargs)
  File "/home/gabriel/repos/bot/env/local/lib/python2.7/site-packages/signalr/hubs/_hub.py", line 25, in handle
    rspHandlers[callId](**rspArgs)
TypeError: done_subscribe() argument after ** must be a mapping, not bool
Sun Oct  1 21:13:42 2017 <Greenlet at 0x7f529dc29af0: wrapped_listener> failed with TypeError

I'm honestly not even sure that the if statement is needed -- according to a description of the wire format the R value returned by the server method should be "present if the method is not void". (see the section entitled "Server Side Hub Method Invocation Result")

[u-abramchuk]

Hi,

unfortunately I don't have enough time to maintain the repo. So if anyone wants to take care about signalr-client-py it'll be highly appreciated.

[nkfeiyang]

Is it possible to make invoke() return a value directly? Sometimes we need a sync call to the server. The response parameter is a callback.