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import traceback
PRIORITY_URGENT = 0
PRIORITY_HIGH = 1
PRIORITY_MEDIUM = 2
PRIORITY_LOW = 3
class Event(object):
def __init__(self, bot, name, **kwargs):
self.bot = bot
self.name = name
self.kwargs = kwargs
self.eaten = False
def __getitem__(self, key):
return self.kwargs[key]
def get(self, key, default=None):
return self.kwargs.get(key, default)
def __contains__(self, key):
return key in self.kwargs
def eat(self):
self.eaten = True
class EventCallback(object):
def __init__(self, function, bot, priority, **kwargs):
self.function = function
self.bot = bot
self.priority = priority
self.kwargs = kwargs
def call(self, event):
return self.function(event)
class MultipleEventHook(object):
def __init__(self):
self._event_hooks = set([])
def _add(self, event_hook):
self._event_hooks.add(event_hook)
def hook(self, function, **kwargs):
for event_hook in self._event_hooks:
event_hook.hook(function, **kwargs)
def call(self, max=None, **kwargs):
for event_hook in self._event_hooks:
event_hook.call(max, **kwargs)
class EventHook(object):
def __init__(self, bot, name=None):
self.bot = bot
self.name = name
self._children = {}
self._hooks = []
self._hook_notify = None
self._child_notify = None
self._call_notify = None
self._stored_events = []
def hook(self, function, priority=PRIORITY_LOW, replay=False, **kwargs):
callback = EventCallback(function, self.bot, priority, **kwargs)
if self._hook_notify:
self._hook_notify(self, callback)
self._hooks.append(callback)
self._hooks.sort(key=lambda x: x.priority)
if replay:
for event in self._stored_events:
callback.call(event)
self._stored_events = None
def _unhook(self, hook):
self._hooks.remove(hook)
def on(self, subevent, *extra_subevents, delimiter="."):
if delimiter in subevent:
event_chain = subevent.split(delimiter)
event_obj = self
for event_name in event_chain:
event_obj = event_obj.get_child(event_name)
return event_obj
if extra_subevents:
multiple_event_hook = MultipleEventHook()
for extra_subevent in (subevent,)+extra_subevents:
multiple_event_hook._add(self.get_child(extra_subevent))
return multiple_event_hook
return self.get_child(subevent)
def call_for_result(self, default=None, max=None, **kwargs):
results = self.call(max=max, **kwargs)
return default if not len(results) else results[0]
def call(self, max=None, **kwargs):
event = Event(self.bot, self.name, **kwargs)
if self._call_notify:
self._call_notify(self, event)
if not self._stored_events == None:
self._stored_events.append(event)
called = 0
returns = []
for hook in self._hooks:
if max and called == max:
break
if event.eaten:
break
try:
returns.append(hook.call(event))
except Exception as e:
traceback.print_exc()
# TODO don't make this an event call. can lead to error cycles!
#self.bot.events.on("log").on("error").call(
# message="Failed to call event callback",
# data=traceback.format_exc())
called += 1
return returns
def get_child(self, child_name):
child_name_lower = child_name.lower()
if not child_name_lower in self._children:
self._children[child_name_lower] = EventHook(self.bot,
child_name)
if self._child_notify:
self._child_notify(self, self._children[
child_name_lower])
return self._children[child_name_lower]
def get_hooks(self):
return self._hooks
def get_children(self):
return self._children.keys()
def set_hook_notify(self, handler):
self._hook_notify = handler
def set_child_notify(self, handler):
self._child_notify = handler
def set_call_notify(self, handler):
self._call_notify = handler
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