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