signals = Namespace()
# these are the signals currently defined. They should be sent from the
# code whenever the relevant things have happened.
new_entry = signals.signal("new_entry")
edit_entry = signals.signal("edit_entry")
new_logbook = signals.signal("new_logbook")
edit_logbook = signals.signal("edit_logbook")
def on_signal(signal_name, *args, **kwargs):
"Find and run any action configured for the signal."
action_config = current_app.config.get("ACTIONS", {})
action = action_config.get(signal_name)
if action:
logging.debug("Running configured action for '%s'", signal_name)
try:
# The action is run in a thread, to prevent it from hanging
# the whole app, e.g. if it does some slow network stuff.
# This is a bit naive, a flood of actions might create a
# ridiculous number of threads. Maybe better to use a worker
# pool and a queue or something?
Thread(target=action, args=args, kwargs=kwargs).run()
except Exception as e:
logging.error("Caught exception in action for '%s': %s",
signal_name, e)
for name, signal in signals.items():
signal.connect(partial(on_signal, name), weak=False)
