484 lines
18 KiB
Python
484 lines
18 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 OpenMarket Ltd
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# Copyright 2017 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from twisted.internet import defer
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from .push_rule_evaluator import PushRuleEvaluatorForEvent
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from synapse.event_auth import get_user_power_level
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from synapse.api.constants import EventTypes, Membership
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from synapse.metrics import get_metrics_for
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from synapse.util.caches import metrics as cache_metrics
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from synapse.util.caches.descriptors import cached
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from synapse.util.async import Linearizer
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from synapse.state import POWER_KEY
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from collections import namedtuple
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logger = logging.getLogger(__name__)
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rules_by_room = {}
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push_metrics = get_metrics_for(__name__)
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push_rules_invalidation_counter = push_metrics.register_counter(
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"push_rules_invalidation_counter"
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)
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push_rules_state_size_counter = push_metrics.register_counter(
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"push_rules_state_size_counter"
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)
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# Measures whether we use the fast path of using state deltas, or if we have to
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# recalculate from scratch
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push_rules_delta_state_cache_metric = cache_metrics.register_cache(
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"cache",
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size_callback=lambda: 0, # Meaningless size, as this isn't a cache that stores values
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cache_name="push_rules_delta_state_cache_metric",
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)
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class BulkPushRuleEvaluator(object):
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"""Calculates the outcome of push rules for an event for all users in the
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room at once.
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"""
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def __init__(self, hs):
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self.hs = hs
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self.store = hs.get_datastore()
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self.auth = hs.get_auth()
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self.room_push_rule_cache_metrics = cache_metrics.register_cache(
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"cache",
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size_callback=lambda: 0, # There's not good value for this
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cache_name="room_push_rule_cache",
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)
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@defer.inlineCallbacks
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def _get_rules_for_event(self, event, context):
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"""This gets the rules for all users in the room at the time of the event,
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as well as the push rules for the invitee if the event is an invite.
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Returns:
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dict of user_id -> push_rules
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"""
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room_id = event.room_id
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rules_for_room = self._get_rules_for_room(room_id)
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rules_by_user = yield rules_for_room.get_rules(event, context)
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# if this event is an invite event, we may need to run rules for the user
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# who's been invited, otherwise they won't get told they've been invited
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if event.type == 'm.room.member' and event.content['membership'] == 'invite':
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invited = event.state_key
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if invited and self.hs.is_mine_id(invited):
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has_pusher = yield self.store.user_has_pusher(invited)
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if has_pusher:
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rules_by_user = dict(rules_by_user)
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rules_by_user[invited] = yield self.store.get_push_rules_for_user(
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invited
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)
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defer.returnValue(rules_by_user)
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@cached()
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def _get_rules_for_room(self, room_id):
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"""Get the current RulesForRoom object for the given room id
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Returns:
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RulesForRoom
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"""
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# It's important that RulesForRoom gets added to self._get_rules_for_room.cache
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# before any lookup methods get called on it as otherwise there may be
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# a race if invalidate_all gets called (which assumes its in the cache)
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return RulesForRoom(
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self.hs, room_id, self._get_rules_for_room.cache,
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self.room_push_rule_cache_metrics,
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)
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@defer.inlineCallbacks
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def _get_power_levels_and_sender_level(self, event, context):
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pl_event_id = context.prev_state_ids.get(POWER_KEY)
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if pl_event_id:
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# fastpath: if there's a power level event, that's all we need, and
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# not having a power level event is an extreme edge case
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pl_event = yield self.store.get_event(pl_event_id)
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auth_events = {POWER_KEY: pl_event}
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else:
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auth_events_ids = yield self.auth.compute_auth_events(
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event, context.prev_state_ids, for_verification=False,
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)
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auth_events = yield self.store.get_events(auth_events_ids)
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auth_events = {
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(e.type, e.state_key): e for e in auth_events.itervalues()
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}
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sender_level = get_user_power_level(event.sender, auth_events)
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pl_event = auth_events.get(POWER_KEY)
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defer.returnValue((pl_event.content if pl_event else {}, sender_level))
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@defer.inlineCallbacks
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def action_for_event_by_user(self, event, context):
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"""Given an event and context, evaluate the push rules and insert the
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results into the event_push_actions_staging table.
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Returns:
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Deferred
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"""
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rules_by_user = yield self._get_rules_for_event(event, context)
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actions_by_user = {}
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room_members = yield self.store.get_joined_users_from_context(
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event, context
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)
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(power_levels, sender_power_level) = (
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yield self._get_power_levels_and_sender_level(event, context)
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)
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evaluator = PushRuleEvaluatorForEvent(
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event, len(room_members), sender_power_level, power_levels,
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)
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condition_cache = {}
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for uid, rules in rules_by_user.iteritems():
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if event.sender == uid:
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continue
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if not event.is_state():
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is_ignored = yield self.store.is_ignored_by(event.sender, uid)
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if is_ignored:
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continue
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display_name = None
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profile_info = room_members.get(uid)
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if profile_info:
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display_name = profile_info.display_name
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if not display_name:
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# Handle the case where we are pushing a membership event to
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# that user, as they might not be already joined.
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if event.type == EventTypes.Member and event.state_key == uid:
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display_name = event.content.get("displayname", None)
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for rule in rules:
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if 'enabled' in rule and not rule['enabled']:
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continue
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matches = _condition_checker(
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evaluator, rule['conditions'], uid, display_name, condition_cache
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)
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if matches:
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actions = [x for x in rule['actions'] if x != 'dont_notify']
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if actions and 'notify' in actions:
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# Push rules say we should notify the user of this event
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actions_by_user[uid] = actions
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break
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# Mark in the DB staging area the push actions for users who should be
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# notified for this event. (This will then get handled when we persist
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# the event)
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yield self.store.add_push_actions_to_staging(
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event.event_id, actions_by_user,
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)
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def _condition_checker(evaluator, conditions, uid, display_name, cache):
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for cond in conditions:
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_id = cond.get("_id", None)
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if _id:
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res = cache.get(_id, None)
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if res is False:
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return False
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elif res is True:
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continue
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res = evaluator.matches(cond, uid, display_name)
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if _id:
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cache[_id] = bool(res)
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if not res:
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return False
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return True
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class RulesForRoom(object):
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"""Caches push rules for users in a room.
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This efficiently handles users joining/leaving the room by not invalidating
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the entire cache for the room.
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"""
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def __init__(self, hs, room_id, rules_for_room_cache, room_push_rule_cache_metrics):
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"""
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Args:
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hs (HomeServer)
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room_id (str)
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rules_for_room_cache(Cache): The cache object that caches these
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RoomsForUser objects.
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room_push_rule_cache_metrics (CacheMetric)
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"""
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self.room_id = room_id
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self.is_mine_id = hs.is_mine_id
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self.store = hs.get_datastore()
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self.room_push_rule_cache_metrics = room_push_rule_cache_metrics
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self.linearizer = Linearizer(name="rules_for_room")
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self.member_map = {} # event_id -> (user_id, state)
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self.rules_by_user = {} # user_id -> rules
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# The last state group we updated the caches for. If the state_group of
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# a new event comes along, we know that we can just return the cached
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# result.
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# On invalidation of the rules themselves (if the user changes them),
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# we invalidate everything and set state_group to `object()`
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self.state_group = object()
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# A sequence number to keep track of when we're allowed to update the
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# cache. We bump the sequence number when we invalidate the cache. If
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# the sequence number changes while we're calculating stuff we should
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# not update the cache with it.
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self.sequence = 0
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# A cache of user_ids that we *know* aren't interesting, e.g. user_ids
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# owned by AS's, or remote users, etc. (I.e. users we will never need to
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# calculate push for)
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# These never need to be invalidated as we will never set up push for
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# them.
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self.uninteresting_user_set = set()
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# We need to be clever on the invalidating caches callbacks, as
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# otherwise the invalidation callback holds a reference to the object,
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# potentially causing it to leak.
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# To get around this we pass a function that on invalidations looks ups
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# the RoomsForUser entry in the cache, rather than keeping a reference
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# to self around in the callback.
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self.invalidate_all_cb = _Invalidation(rules_for_room_cache, room_id)
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@defer.inlineCallbacks
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def get_rules(self, event, context):
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"""Given an event context return the rules for all users who are
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currently in the room.
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"""
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state_group = context.state_group
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if state_group and self.state_group == state_group:
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logger.debug("Using cached rules for %r", self.room_id)
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self.room_push_rule_cache_metrics.inc_hits()
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defer.returnValue(self.rules_by_user)
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with (yield self.linearizer.queue(())):
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if state_group and self.state_group == state_group:
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logger.debug("Using cached rules for %r", self.room_id)
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self.room_push_rule_cache_metrics.inc_hits()
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defer.returnValue(self.rules_by_user)
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self.room_push_rule_cache_metrics.inc_misses()
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ret_rules_by_user = {}
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missing_member_event_ids = {}
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if state_group and self.state_group == context.prev_group:
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# If we have a simple delta then we can reuse most of the previous
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# results.
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ret_rules_by_user = self.rules_by_user
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current_state_ids = context.delta_ids
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push_rules_delta_state_cache_metric.inc_hits()
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else:
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current_state_ids = context.current_state_ids
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push_rules_delta_state_cache_metric.inc_misses()
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push_rules_state_size_counter.inc_by(len(current_state_ids))
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logger.debug(
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"Looking for member changes in %r %r", state_group, current_state_ids
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)
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# Loop through to see which member events we've seen and have rules
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# for and which we need to fetch
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for key in current_state_ids:
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typ, user_id = key
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if typ != EventTypes.Member:
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continue
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if user_id in self.uninteresting_user_set:
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continue
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if not self.is_mine_id(user_id):
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self.uninteresting_user_set.add(user_id)
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continue
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if self.store.get_if_app_services_interested_in_user(user_id):
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self.uninteresting_user_set.add(user_id)
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continue
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event_id = current_state_ids[key]
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res = self.member_map.get(event_id, None)
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if res:
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user_id, state = res
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if state == Membership.JOIN:
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rules = self.rules_by_user.get(user_id, None)
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if rules:
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ret_rules_by_user[user_id] = rules
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continue
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# If a user has left a room we remove their push rule. If they
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# joined then we readd it later in _update_rules_with_member_event_ids
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ret_rules_by_user.pop(user_id, None)
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missing_member_event_ids[user_id] = event_id
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if missing_member_event_ids:
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# If we have some memebr events we haven't seen, look them up
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# and fetch push rules for them if appropriate.
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logger.debug("Found new member events %r", missing_member_event_ids)
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yield self._update_rules_with_member_event_ids(
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ret_rules_by_user, missing_member_event_ids, state_group, event
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)
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else:
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# The push rules didn't change but lets update the cache anyway
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self.update_cache(
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self.sequence,
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members={}, # There were no membership changes
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rules_by_user=ret_rules_by_user,
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state_group=state_group
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)
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if logger.isEnabledFor(logging.DEBUG):
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logger.debug(
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"Returning push rules for %r %r",
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self.room_id, ret_rules_by_user.keys(),
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)
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defer.returnValue(ret_rules_by_user)
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@defer.inlineCallbacks
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def _update_rules_with_member_event_ids(self, ret_rules_by_user, member_event_ids,
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state_group, event):
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"""Update the partially filled rules_by_user dict by fetching rules for
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any newly joined users in the `member_event_ids` list.
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Args:
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ret_rules_by_user (dict): Partiallly filled dict of push rules. Gets
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updated with any new rules.
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member_event_ids (list): List of event ids for membership events that
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have happened since the last time we filled rules_by_user
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state_group: The state group we are currently computing push rules
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for. Used when updating the cache.
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"""
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sequence = self.sequence
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rows = yield self.store._simple_select_many_batch(
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table="room_memberships",
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column="event_id",
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iterable=member_event_ids.values(),
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retcols=('user_id', 'membership', 'event_id'),
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keyvalues={},
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batch_size=500,
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desc="_get_rules_for_member_event_ids",
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)
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members = {
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row["event_id"]: (row["user_id"], row["membership"])
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for row in rows
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}
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# If the event is a join event then it will be in current state evnts
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# map but not in the DB, so we have to explicitly insert it.
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if event.type == EventTypes.Member:
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for event_id in member_event_ids.itervalues():
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if event_id == event.event_id:
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members[event_id] = (event.state_key, event.membership)
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if logger.isEnabledFor(logging.DEBUG):
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logger.debug("Found members %r: %r", self.room_id, members.values())
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interested_in_user_ids = set(
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user_id for user_id, membership in members.itervalues()
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if membership == Membership.JOIN
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)
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logger.debug("Joined: %r", interested_in_user_ids)
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if_users_with_pushers = yield self.store.get_if_users_have_pushers(
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interested_in_user_ids,
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on_invalidate=self.invalidate_all_cb,
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)
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user_ids = set(
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uid for uid, have_pusher in if_users_with_pushers.iteritems() if have_pusher
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)
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logger.debug("With pushers: %r", user_ids)
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users_with_receipts = yield self.store.get_users_with_read_receipts_in_room(
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self.room_id, on_invalidate=self.invalidate_all_cb,
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)
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logger.debug("With receipts: %r", users_with_receipts)
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# any users with pushers must be ours: they have pushers
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for uid in users_with_receipts:
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if uid in interested_in_user_ids:
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user_ids.add(uid)
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rules_by_user = yield self.store.bulk_get_push_rules(
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user_ids, on_invalidate=self.invalidate_all_cb,
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)
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ret_rules_by_user.update(
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item for item in rules_by_user.iteritems() if item[0] is not None
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)
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self.update_cache(sequence, members, ret_rules_by_user, state_group)
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def invalidate_all(self):
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# Note: Don't hand this function directly to an invalidation callback
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# as it keeps a reference to self and will stop this instance from being
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# GC'd if it gets dropped from the rules_to_user cache. Instead use
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# `self.invalidate_all_cb`
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logger.debug("Invalidating RulesForRoom for %r", self.room_id)
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self.sequence += 1
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self.state_group = object()
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self.member_map = {}
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self.rules_by_user = {}
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push_rules_invalidation_counter.inc()
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def update_cache(self, sequence, members, rules_by_user, state_group):
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if sequence == self.sequence:
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self.member_map.update(members)
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self.rules_by_user = rules_by_user
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self.state_group = state_group
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class _Invalidation(namedtuple("_Invalidation", ("cache", "room_id"))):
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# We rely on _CacheContext implementing __eq__ and __hash__ sensibly,
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# which namedtuple does for us (i.e. two _CacheContext are the same if
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# their caches and keys match). This is important in particular to
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# dedupe when we add callbacks to lru cache nodes, otherwise the number
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# of callbacks would grow.
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def __call__(self):
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rules = self.cache.get(self.room_id, None, update_metrics=False)
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if rules:
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rules.invalidate_all()
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