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import itertools, time, traceback
PRIORITY_URGENT = 0
PRIORITY_HIGH = 1
PRIORITY_MEDIUM = 2
PRIORITY_LOW = 3
DEFAULT_PRIORITY = PRIORITY_LOW
DEFAULT_DELIMITER = "."
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_limited(self, maximum, **kwargs):
returns = []
for event_hook in self._event_hooks:
returns.append(event_hook.call_limited(maximum, **kwargs))
return returns
def call(self, **kwargs):
returns = []
for event_hook in self._event_hooks:
returns.append(event_hook.call(**kwargs))
return returns
class EventHookContext(object):
def __init__(self, parent, context):
self._parent = parent
self.context = context
def hook(self, function, priority=DEFAULT_PRIORITY, replay=False,
**kwargs):
self._parent._context_hook(self.context, function, priority, replay,
kwargs)
def on(self, subevent, *extra_subevents, delimiter=DEFAULT_DELIMITER):
return self._parent._context_on(self.context, subevent,
extra_subevents, delimiter)
def call_for_result(self, default=None, **kwargs):
return self._parent.call_for_result(default, **kwargs)
def assure_call(self, **kwargs):
self._parent.assure_call(**kwargs)
def call(self, **kwargs):
return self._parent.call(**kwargs)
def call_limited(self, maximum, **kwargs):
return self._parent.call_limited(maximum, **kwargs)
def get_hooks(self):
return self._parent.get_hooks()
def get_children(self):
return self._parent.get_children()
class EventHook(object):
def __init__(self, bot, name=None, parent=None):
self.bot = bot
self.name = name
self.parent = parent
self._children = {}
self._hooks = []
self._stored_events = []
self._context_hooks = {}
def _make_event(self, kwargs):
return Event(self.bot, self.name, **kwargs)
def _get_path(self):
path = []
parent = self
while not parent == None and not parent.name == None:
path.append(parent.name)
parent = parent.parent
return DEFAULT_DELIMITER.join(path[::-1])
def new_context(self, context):
return EventHookContext(self, context)
def hook(self, function, priority=DEFAULT_PRIORITY, replay=False,
**kwargs):
self._hook(function, None, priority, replay, kwargs)
def _context_hook(self, context, function, priority, replay, kwargs):
self._hook(function, context, priority, replay, kwargs)
def _hook(self, function, context, priority, replay, kwargs):
callback = EventCallback(function, self.bot, priority, kwargs)
if context == None:
self._hooks.append(callback)
else:
if not context in self._context_hooks:
self._context_hooks[context] = []
self._context_hooks[context].append(callback)
if replay and not self._stored_events == None:
for kwargs in self._stored_events:
self._call(kwargs)
self._stored_events = None
def on(self, subevent, *extra_subevents, delimiter=DEFAULT_DELIMITER):
return self._on(subevent, extra_subevents, None, delimiter)
def _context_on(self, context, subevent, extra_subevents,
delimiter=DEFAULT_DELIMITER):
return self._on(subevent, extra_subevents, context, delimiter)
def _on(self, subevent, extra_subevents, context, 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)
if not context == None:
return event_obj.new_context(context)
return event_obj
if extra_subevents:
multiple_event_hook = MultipleEventHook()
for extra_subevent in (subevent,)+extra_subevents:
child = self.get_child(extra_subevent)
if not context == None:
child = child.new_context(context)
multiple_event_hook._add(child)
return multiple_event_hook
child = self.get_child(subevent)
if not context == None:
child = child.new_context(context)
return child
def call_for_result(self, default=None, **kwargs):
results = self.call_limited(0, **kwargs)
return default if not len(results) else results[0]
def assure_call(self, **kwargs):
if not self._stored_events == None:
self._stored_events.append(kwargs)
else:
self._call(kwargs)
def call(self, **kwargs):
return self._call(kwargs)
def call_limited(self, maximum, **kwargs):
return self._call(kwargs, maximum=maximum)
def _call(self, kwargs, maximum=None):
event_path = self._get_path()
self.bot.log.debug("calling event: \"%s\" (params: %s)",
[event_path, kwargs])
start = time.monotonic()
event = self._make_event(kwargs)
returns = []
for hook in self.get_hooks()[:maximum]:
if event.eaten:
break
try:
returns.append(hook.call(event))
except Exception as e:
traceback.print_exc()
self.bot.log.error("failed to call event \"%s\"", [
event_path], exc_info=True)
total_milliseconds = (time.monotonic() - start) * 1000
self.bot.log.debug("event \"%s\" called in %fms", [
event_path, total_milliseconds])
self.check_purge()
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_lower, self)
return self._children[child_name_lower]
def remove_child(self, child_name):
child_name_lower = child_name.lower()
if child_name_lower in self._children:
del self._children[child_name_lower]
def check_purge(self):
if self.is_empty() and not self.parent == None:
self.parent.remove_child(self.name)
self.parent.check_purge()
def remove_context(self, context):
del self._context_hooks[context]
def has_context(self, context):
return context in self._context_hooks
def purge_context(self, context):
if self.has_context(context):
self.remove_context(context)
for child_name in self.get_children()[:]:
child = self.get_child(child_name)
child.purge_context(context)
def get_hooks(self):
return sorted(self._hooks + sum(self._context_hooks.values(), []),
key=lambda e: e.priority)
def get_children(self):
return list(self._children.keys())
def is_empty(self):
return len(self.get_hooks() + self.get_children()) == 0
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