56 lines
2.1 KiB
Python
56 lines
2.1 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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flask.signals
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~~~~~~~~~~~~~
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Implements signals based on blinker if available, otherwise
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falls silently back to a noop
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:copyright: (c) 2011 by Armin Ronacher.
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:license: BSD, see LICENSE for more details.
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"""
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signals_available = False
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try:
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from blinker import Namespace
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signals_available = True
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except ImportError:
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class Namespace(object):
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def signal(self, name, doc=None):
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return _FakeSignal(name, doc)
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class _FakeSignal(object):
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"""If blinker is unavailable, create a fake class with the same
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interface that allows sending of signals but will fail with an
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error on anything else. Instead of doing anything on send, it
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will just ignore the arguments and do nothing instead.
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"""
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def __init__(self, name, doc=None):
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self.name = name
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self.__doc__ = doc
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def _fail(self, *args, **kwargs):
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raise RuntimeError('signalling support is unavailable '
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'because the blinker library is '
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'not installed.')
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send = lambda *a, **kw: None
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connect = disconnect = has_receivers_for = receivers_for = \
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temporarily_connected_to = connected_to = _fail
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del _fail
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# the namespace for code signals. If you are not flask code, do
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# not put signals in here. Create your own namespace instead.
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_signals = Namespace()
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# core signals. For usage examples grep the sourcecode or consult
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# the API documentation in docs/api.rst as well as docs/signals.rst
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template_rendered = _signals.signal('template-rendered')
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request_started = _signals.signal('request-started')
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request_finished = _signals.signal('request-finished')
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request_tearing_down = _signals.signal('request-tearing-down')
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got_request_exception = _signals.signal('got-request-exception')
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appcontext_tearing_down = _signals.signal('appcontext-tearing-down')
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appcontext_pushed = _signals.signal('appcontext-pushed')
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appcontext_popped = _signals.signal('appcontext-popped')
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message_flashed = _signals.signal('message-flashed')
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