# -*- coding: utf-8 -*- # Copyright 2015, 2016 OpenMarket Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from twisted.internet import defer from synapse.streams.config import PaginationConfig from synapse.types import StreamToken import synapse.util.async import push_rule_evaluator as push_rule_evaluator import logging import random logger = logging.getLogger(__name__) class Pusher(object): INITIAL_BACKOFF = 1000 MAX_BACKOFF = 60 * 60 * 1000 GIVE_UP_AFTER = 24 * 60 * 60 * 1000 def __init__(self, _hs, profile_tag, user_name, app_id, app_display_name, device_display_name, pushkey, pushkey_ts, data, last_token, last_success, failing_since): self.hs = _hs self.evStreamHandler = self.hs.get_handlers().event_stream_handler self.store = self.hs.get_datastore() self.clock = self.hs.get_clock() self.profile_tag = profile_tag self.user_name = user_name self.app_id = app_id self.app_display_name = app_display_name self.device_display_name = device_display_name self.pushkey = pushkey self.pushkey_ts = pushkey_ts self.data = data self.last_token = last_token self.last_success = last_success # not actually used self.backoff_delay = Pusher.INITIAL_BACKOFF self.failing_since = failing_since self.alive = True # The last value of last_active_time that we saw self.last_last_active_time = 0 self.has_unread = True @defer.inlineCallbacks def get_context_for_event(self, ev): name_aliases = yield self.store.get_room_name_and_aliases( ev['room_id'] ) ctx = {'aliases': name_aliases[1]} if name_aliases[0] is not None: ctx['name'] = name_aliases[0] their_member_events_for_room = yield self.store.get_current_state( room_id=ev['room_id'], event_type='m.room.member', state_key=ev['user_id'] ) for mev in their_member_events_for_room: if mev.content['membership'] == 'join' and 'displayname' in mev.content: dn = mev.content['displayname'] if dn is not None: ctx['sender_display_name'] = dn defer.returnValue(ctx) @defer.inlineCallbacks def start(self): if not self.last_token: # First-time setup: get a token to start from (we can't # just start from no token, ie. 'now' # because we need the result to be reproduceable in case # we fail to dispatch the push) config = PaginationConfig(from_token=None, limit='1') chunk = yield self.evStreamHandler.get_stream( self.user_name, config, timeout=0, affect_presence=False, only_room_events=True ) self.last_token = chunk['end'] self.store.update_pusher_last_token( self.app_id, self.pushkey, self.user_name, self.last_token ) logger.info("Pusher %s for user %s starting from token %s", self.pushkey, self.user_name, self.last_token) wait = 0 while self.alive: try: if wait > 0: yield synapse.util.async.sleep(wait) yield self.get_and_dispatch() wait = 0 except: if wait == 0: wait = 1 else: wait = min(wait * 2, 1800) logger.exception( "Exception in pusher loop for pushkey %s. Pausing for %ds", self.pushkey, wait ) @defer.inlineCallbacks def get_and_dispatch(self): from_tok = StreamToken.from_string(self.last_token) config = PaginationConfig(from_token=from_tok, limit='1') timeout = (300 + random.randint(-60, 60)) * 1000 chunk = yield self.evStreamHandler.get_stream( self.user_name, config, timeout=timeout, affect_presence=False, only_room_events=True ) # limiting to 1 may get 1 event plus 1 presence event, so # pick out the actual event single_event = None for c in chunk['chunk']: if 'event_id' in c: # Hmmm... single_event = c break if not single_event: self.last_token = chunk['end'] logger.debug("Event stream timeout for pushkey %s", self.pushkey) yield self.store.update_pusher_last_token( self.app_id, self.pushkey, self.user_name, self.last_token ) return if not self.alive: return processed = False rule_evaluator = yield \ push_rule_evaluator.evaluator_for_user_name_and_profile_tag( self.user_name, self.profile_tag, single_event['room_id'], self.store ) actions = yield rule_evaluator.actions_for_event(single_event) tweaks = rule_evaluator.tweaks_for_actions(actions) if len(actions) == 0: logger.warn("Empty actions! Using default action.") actions = Pusher.DEFAULT_ACTIONS if 'notify' not in actions and 'dont_notify' not in actions: logger.warn("Neither notify nor dont_notify in actions: adding default") actions.extend(Pusher.DEFAULT_ACTIONS) if 'dont_notify' in actions: logger.debug( "%s for %s: dont_notify", single_event['event_id'], self.user_name ) processed = True else: rejected = yield self.dispatch_push(single_event, tweaks) self.has_unread = True if isinstance(rejected, list) or isinstance(rejected, tuple): processed = True for pk in rejected: if pk != self.pushkey: # for sanity, we only remove the pushkey if it # was the one we actually sent... logger.warn( ("Ignoring rejected pushkey %s because we" " didn't send it"), pk ) else: logger.info( "Pushkey %s was rejected: removing", pk ) yield self.hs.get_pusherpool().remove_pusher( self.app_id, pk, self.user_name ) if not self.alive: return if processed: self.backoff_delay = Pusher.INITIAL_BACKOFF self.last_token = chunk['end'] yield self.store.update_pusher_last_token_and_success( self.app_id, self.pushkey, self.user_name, self.last_token, self.clock.time_msec() ) if self.failing_since: self.failing_since = None yield self.store.update_pusher_failing_since( self.app_id, self.pushkey, self.user_name, self.failing_since) else: if not self.failing_since: self.failing_since = self.clock.time_msec() yield self.store.update_pusher_failing_since( self.app_id, self.pushkey, self.user_name, self.failing_since ) if (self.failing_since and self.failing_since < self.clock.time_msec() - Pusher.GIVE_UP_AFTER): # we really only give up so that if the URL gets # fixed, we don't suddenly deliver a load # of old notifications. logger.warn("Giving up on a notification to user %s, " "pushkey %s", self.user_name, self.pushkey) self.backoff_delay = Pusher.INITIAL_BACKOFF self.last_token = chunk['end'] yield self.store.update_pusher_last_token( self.app_id, self.pushkey, self.user_name, self.last_token ) self.failing_since = None yield self.store.update_pusher_failing_since( self.app_id, self.pushkey, self.user_name, self.failing_since ) else: logger.warn("Failed to dispatch push for user %s " "(failing for %dms)." "Trying again in %dms", self.user_name, self.clock.time_msec() - self.failing_since, self.backoff_delay) yield synapse.util.async.sleep(self.backoff_delay / 1000.0) self.backoff_delay *= 2 if self.backoff_delay > Pusher.MAX_BACKOFF: self.backoff_delay = Pusher.MAX_BACKOFF def stop(self): self.alive = False def dispatch_push(self, p, tweaks): """ Overridden by implementing classes to actually deliver the notification Args: p: The event to notify for as a single event from the event stream Returns: If the notification was delivered, an array containing any pushkeys that were rejected by the push gateway. False if the notification could not be delivered (ie. should be retried). """ pass def reset_badge_count(self): pass def presence_changed(self, state): """ We clear badge counts whenever a user's last_active time is bumped This is by no means perfect but I think it's the best we can do without read receipts. """ if 'last_active' in state.state: last_active = state.state['last_active'] if last_active > self.last_last_active_time: self.last_last_active_time = last_active if self.has_unread: logger.info("Resetting badge count for %s", self.user_name) self.reset_badge_count() self.has_unread = False class PusherConfigException(Exception): def __init__(self, msg): super(PusherConfigException, self).__init__(msg)