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import threading |
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import collections |
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import warnings |
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import os.path |
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import watchdog.observers |
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import watchdog.events |
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class Event(list): |
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''' |
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Event subscription list. |
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A list of callable objects. Calling an instance of this will cause a |
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call to each item in the list in ascending order by index. |
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Usage: |
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>>> def f(x): |
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... print 'f(%s)' % x |
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>>> def g(x): |
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... print 'g(%s)' % x |
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>>> e = Event() |
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>>> e() |
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>>> e.append(f) |
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>>> e(123) |
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f(123) |
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>>> e.remove(f) |
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>>> e() |
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>>> e += (f, g) |
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>>> e(10) |
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f(10) |
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g(10) |
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>>> del e[0] |
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>>> e(2) |
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g(2) |
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''' |
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lock_class = threading.Lock |
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queue_class = collections.deque |
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def __init__(self, iterable=()): |
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self._lock = self.lock_class() |
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self._queue = self.queue_class() |
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super(Event, self).__init__(iterable) |
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def __call__(self, *args, **kwargs): |
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self._queue.append((args, kwargs)) |
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while self._queue: |
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if self._lock.acquire(False): |
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try: |
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args, kwargs = self._queue.popleft() |
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for f in self: |
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f(*args, **kwargs) |
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finally: |
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self._lock.release() |
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else: |
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break |
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def __repr__(self): |
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return "Event(%s)" % list.__repr__(self) |
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class EventManager(collections.defaultdict): |
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''' |
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Attribute-dict creating :class:`Event` objects on demand. |
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Usage: |
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>>> def f(x): |
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... print 'f(%s)' % x |
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>>> def g(x): |
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... print 'g(%s)' % x |
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>>> m = EventManager() |
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>>> 'e' in m |
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False |
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>>> m.e.append(f) |
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>>> 'e' in m |
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True |
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>>> m.e(123) |
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f(123) |
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>>> m.e.remove(f) |
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>>> m.e() |
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>>> m.e += (f, g) |
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>>> m.e(10) |
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f(10) |
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g(10) |
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>>> del m.e[0] |
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>>> m.e(2) |
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g(2) |
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''' |
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def __init__(self, app=None): |
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self.app = app |
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super(EventManager, self).__init__(Event) |
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def __getattr__(self, name): |
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if name.startswith('_'): |
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return super(Event, self).__getattr__(name) |
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return self[name] |
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class WathdogEventSource(object): |
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observer_class = watchdog.observers.Observer |
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event_class = collections.namedtuple( |
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'FSEvent', ('type', 'path', 'source', 'is_directory') |
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) |
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event_map = { |
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watchdog.events.EVENT_TYPE_MOVED: 'fs_move', |
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watchdog.events.EVENT_TYPE_DELETED: 'fs_remove', |
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watchdog.events.EVENT_TYPE_CREATED: 'fs_create', |
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watchdog.events.EVENT_TYPE_MODIFIED: 'fs_modify' |
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} |
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_observer = None |
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def __init__(self, manager, app=None): |
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self.manager = manager |
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self.app = app |
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self.reload() |
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def dispatch(self, wevent): |
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event = self.event_class( |
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self.event_map[wevent.event_type], |
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wevent.dest_path if type == 'fs_move' else wevent.src_path, |
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wevent.src_path, |
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wevent.is_directory |
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) |
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event_type_specific = '%s_%s' % ( |
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event.type, |
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'file' if event.is_directory else 'directory' |
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) |
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self.manager['fs_any'](event) |
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self.manager[event.type](event) |
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self.manager[event_type_specific](event) |
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def reload(self): |
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self.clear() |
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path = self.app.config.get('base_directory') if self.app else None |
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if not path: |
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return |
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if not os.path.isdir(path): |
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warnings.warn( |
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'Path {0!r} is not observable.'.format(path), |
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category=RuntimeWarning, |
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stacklevel=2 |
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) |
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return |
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observer = self.observer_class() |
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observer.schedule(self, path, recursive=True) |
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observer.start() |
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self._observer = observer |
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def clear(self): |
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observer = self._observer |
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if observer: |
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observer.unschedule_all() |
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observer.stop() |
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observer.join() |
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self._observer = None |
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ergoithz /
browsepy
