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- """
- Implements signals based on blinker if available, otherwise
- falls silently back to a noop. Shamelessly stolen from flask.signals:
- https://github.com/mitsuhiko/flask/blob/master/flask/signals.py
- """
- signals_available = False
- try:
- from blinker import Namespace
- signals_available = True
- except ImportError: # noqa
- class Namespace:
- def signal(self, name, doc=None):
- return _FakeSignal(name, doc)
- class _FakeSignal:
- """If blinker is unavailable, create a fake class with the same
- interface that allows sending of signals but will fail with an
- error on anything else. Instead of doing anything on send, it
- will just ignore the arguments and do nothing instead.
- """
- def __init__(self, name, doc=None):
- self.name = name
- self.__doc__ = doc
- def _fail(self, *args, **kwargs):
- raise RuntimeError('signalling support is unavailable '
- 'because the blinker library is '
- 'not installed.')
- send = lambda *a, **kw: None
- connect = disconnect = has_receivers_for = receivers_for = \
- temporarily_connected_to = connected_to = _fail
- del _fail
- # The namespace for code signals. If you are not oauthlib code, do
- # not put signals in here. Create your own namespace instead.
- _signals = Namespace()
- # Core signals.
- scope_changed = _signals.signal('scope-changed')
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