def only_once(action=None):
"""
Register the decorated function to be run once, and only once.
This decorator will never cause arguments to be passed to the handler.
"""
if action is None:
# allow to be used as @only_once or @only_once()
return only_once
action_id = _action_id(action)
handler = Handler.get(action)
handler.add_predicate(lambda: not was_invoked(action_id))
handler.add_post_callback(partial(mark_invoked, action_id))
return action
def only_once(action=None):
"""
Register the decorated function to be run once, and only once.
This decorator will never cause arguments to be passed to the handler.
"""
if action is None:
# allow to be used as @only_once or @only_once()
return only_once
action_id = _action_id(action)
handler = Handler.get(action)
handler.add_predicate(lambda: not was_invoked(action_id))
handler.add_post_callback(partial(mark_invoked, action_id))
return action
def _decorator(func):
action_id = _action_id(func)
short_action_id = _short_action_id(func)
@wraps(func)
def _wrapped(*args, **kwargs):
active_states = get_states()
missing_states = [state for state in desired_states if state not in active_states]
if missing_states:
hookenv.log('%s called before state%s: %s' % (
short_action_id,
's' if len(missing_states) > 1 else '',
', '.join(missing_states)), hookenv.WARNING)
return func(*args, **kwargs)
_wrapped._action_id = action_id
_wrapped._short_action_id = short_action_id
return _wrapped
def _decorator(func):
action_id = _action_id(func)
short_action_id = _short_action_id(func)
@wraps(func)
def _wrapped(*args, **kwargs):
active_flags = get_flags()
missing_flags = [flag for flag in desired_flags if flag not in active_flags]
if missing_flags:
hookenv.log('%s called before flag%s: %s' % (
short_action_id,
's' if len(missing_flags) > 1 else '',
', '.join(missing_flags)), hookenv.WARNING)
return func(*args, **kwargs)
_wrapped._action_id = action_id
_wrapped._short_action_id = short_action_id
return _wrapped
def _decorator(func):
action_id = _action_id(func)
short_action_id = _short_action_id(func)
@wraps(func)
def _wrapped(*args, **kwargs):
active_states = get_states()
missing_states = [state for state in desired_states if state not in active_states]
if missing_states:
hookenv.log(
"%s called before state%s: %s"
% (short_action_id, "s" if len(missing_states) > 1 else "", ", ".join(missing_states)),
hookenv.WARNING,
)
return func(*args, **kwargs)
_wrapped._action_id = action_id
_wrapped._short_action_id = short_action_id
return _wrapped
def only_once(action=None):
"""
.. deprecated:: 0.5.0
Use :func:`when_not` in combination with :func:`set_state` instead. This
handler is deprecated because it might actually be
`called multiple times <https://github.com/juju-solutions/charms.reactive/issues/22>`_.
Register the decorated function to be run once, and only once.
This decorator will never cause arguments to be passed to the handler.
"""
if action is None:
# allow to be used as @only_once or @only_once()
return only_once
action_id = _action_id(action)
handler = Handler.get(action)
handler.add_predicate(lambda: not was_invoked(action_id))
handler.add_post_callback(partial(mark_invoked, action_id))
return action
def wrapper(*args, **kwargs):
action_id = _action_id(action)
if not was_invoked(action_id):
action(*args, **kwargs)
mark_invoked(action_id)
