357 lines
12 KiB
Python
357 lines
12 KiB
Python
# 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 itertools
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import logging
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from typing import (
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TYPE_CHECKING,
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Collection,
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Dict,
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Iterable,
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List,
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Mapping,
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Optional,
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Set,
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Tuple,
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Union,
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)
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from prometheus_client import Counter
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from synapse.api.constants import EventTypes, Membership, RelationTypes
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from synapse.event_auth import auth_types_for_event, get_user_power_level
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from synapse.events import EventBase, relation_from_event
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from synapse.events.snapshot import EventContext
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from synapse.state import POWER_KEY
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from synapse.storage.databases.main.roommember import EventIdMembership
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from synapse.storage.state import StateFilter
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from synapse.util.caches import register_cache
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from synapse.util.metrics import measure_func
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from synapse.visibility import filter_event_for_clients_with_state
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from .baserules import FilteredPushRules, PushRule
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from .push_rule_evaluator import PushRuleEvaluatorForEvent
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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push_rules_invalidation_counter = Counter(
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"synapse_push_bulk_push_rule_evaluator_push_rules_invalidation_counter", ""
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)
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push_rules_state_size_counter = Counter(
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"synapse_push_bulk_push_rule_evaluator_push_rules_state_size_counter", ""
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)
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STATE_EVENT_TYPES_TO_MARK_UNREAD = {
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EventTypes.Topic,
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EventTypes.Name,
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EventTypes.RoomAvatar,
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EventTypes.Tombstone,
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}
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def _should_count_as_unread(event: EventBase, context: EventContext) -> bool:
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# Exclude rejected and soft-failed events.
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if context.rejected or event.internal_metadata.is_soft_failed():
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return False
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# Exclude notices.
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if (
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not event.is_state()
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and event.type == EventTypes.Message
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and event.content.get("msgtype") == "m.notice"
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):
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return False
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# Exclude edits.
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relates_to = relation_from_event(event)
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if relates_to and relates_to.rel_type == RelationTypes.REPLACE:
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return False
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# Mark events that have a non-empty string body as unread.
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body = event.content.get("body")
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if isinstance(body, str) and body:
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return True
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# Mark some state events as unread.
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if event.is_state() and event.type in STATE_EVENT_TYPES_TO_MARK_UNREAD:
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return True
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# Mark encrypted events as unread.
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if not event.is_state() and event.type == EventTypes.Encrypted:
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return True
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return False
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class BulkPushRuleEvaluator:
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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: "HomeServer"):
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self.hs = hs
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self.store = hs.get_datastores().main
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self.clock = hs.get_clock()
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self._event_auth_handler = hs.get_event_auth_handler()
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self.room_push_rule_cache_metrics = register_cache(
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"cache",
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"room_push_rule_cache",
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cache=[], # Meaningless size, as this isn't a cache that stores values,
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resizable=False,
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)
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# Whether to support MSC3772 is supported.
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self._relations_match_enabled = self.hs.config.experimental.msc3772_enabled
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async def _get_rules_for_event(
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self,
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event: EventBase,
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) -> Dict[str, FilteredPushRules]:
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"""Get the push rules for all users who may need to be notified about
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the event.
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Note: this does not check if the user is allowed to see the event.
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Returns:
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Mapping of user ID to their push rules.
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"""
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# We get the users who may need to be notified by first fetching the
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# local users currently in the room, finding those that have push rules,
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# and *then* checking which users are actually allowed to see the event.
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#
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# The alternative is to first fetch all users that were joined at the
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# event, but that requires fetching the full state at the event, which
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# may be expensive for large rooms with few local users.
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local_users = await self.store.get_local_users_in_room(event.room_id)
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# Filter out appservice users.
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local_users = [
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u
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for u in local_users
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if not self.store.get_if_app_services_interested_in_user(u)
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]
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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 == EventTypes.Member and event.membership == Membership.INVITE:
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invited = event.state_key
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if invited and self.hs.is_mine_id(invited) and invited not in local_users:
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local_users = list(local_users)
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local_users.append(invited)
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rules_by_user = await self.store.bulk_get_push_rules(local_users)
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logger.debug("Users in room: %s", local_users)
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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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event.room_id,
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list(rules_by_user.keys()),
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)
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return rules_by_user
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async def _get_power_levels_and_sender_level(
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self, event: EventBase, context: EventContext
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) -> Tuple[dict, int]:
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event_types = auth_types_for_event(event.room_version, event)
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prev_state_ids = await context.get_prev_state_ids(
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StateFilter.from_types(event_types)
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)
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pl_event_id = 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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auth_events = {POWER_KEY: await self.store.get_event(pl_event_id)}
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else:
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auth_events_ids = self._event_auth_handler.compute_auth_events(
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event, prev_state_ids, for_verification=False
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)
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auth_events_dict = await self.store.get_events(auth_events_ids)
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auth_events = {(e.type, e.state_key): e for e in auth_events_dict.values()}
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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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return pl_event.content if pl_event else {}, sender_level
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async def _get_mutual_relations(
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self, event: EventBase, rules: Iterable[Tuple[PushRule, bool]]
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) -> Dict[str, Set[Tuple[str, str]]]:
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"""
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Fetch event metadata for events which related to the same event as the given event.
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If the given event has no relation information, returns an empty dictionary.
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Args:
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event_id: The event ID which is targeted by relations.
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rules: The push rules which will be processed for this event.
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Returns:
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A dictionary of relation type to:
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A set of tuples of:
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The sender
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The event type
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"""
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# If the experimental feature is not enabled, skip fetching relations.
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if not self._relations_match_enabled:
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return {}
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# If the event does not have a relation, then cannot have any mutual
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# relations.
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relation = relation_from_event(event)
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if not relation:
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return {}
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# Pre-filter to figure out which relation types are interesting.
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rel_types = set()
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for rule, enabled in rules:
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if not enabled:
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continue
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for condition in rule.conditions:
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if condition["kind"] != "org.matrix.msc3772.relation_match":
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continue
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# rel_type is required.
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rel_type = condition.get("rel_type")
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if rel_type:
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rel_types.add(rel_type)
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# If no valid rules were found, no mutual relations.
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if not rel_types:
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return {}
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# If any valid rules were found, fetch the mutual relations.
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return await self.store.get_mutual_event_relations(
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relation.parent_id, rel_types
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)
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@measure_func("action_for_event_by_user")
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async def action_for_event_by_user(
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self, event: EventBase, context: EventContext
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) -> None:
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"""Given an event and context, evaluate the push rules, check if the message
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should increment the unread count, and insert the results into the
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event_push_actions_staging table.
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"""
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if event.internal_metadata.is_outlier():
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# This can happen due to out of band memberships
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return
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count_as_unread = _should_count_as_unread(event, context)
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rules_by_user = await self._get_rules_for_event(event)
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actions_by_user: Dict[str, Collection[Union[Mapping, str]]] = {}
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room_member_count = await self.store.get_number_joined_users_in_room(
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event.room_id
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)
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(
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power_levels,
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sender_power_level,
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) = await self._get_power_levels_and_sender_level(event, context)
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relations = await self._get_mutual_relations(
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event, itertools.chain(*rules_by_user.values())
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)
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evaluator = PushRuleEvaluatorForEvent(
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event,
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room_member_count,
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sender_power_level,
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power_levels,
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relations,
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self._relations_match_enabled,
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)
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users = rules_by_user.keys()
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profiles = await self.store.get_subset_users_in_room_with_profiles(
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event.room_id, users
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)
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# This is a check for the case where user joins a room without being
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# allowed to see history, and then the server receives a delayed event
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# from before the user joined, which they should not be pushed for
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uids_with_visibility = await filter_event_for_clients_with_state(
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self.store, users, event, context
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)
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for uid, rules in rules_by_user.items():
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if event.sender == uid:
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continue
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if uid not in uids_with_visibility:
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continue
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display_name = None
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profile = profiles.get(uid)
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if profile:
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display_name = profile.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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if not isinstance(display_name, str):
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display_name = None
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if count_as_unread:
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# Add an element for the current user if the event needs to be marked as
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# unread, so that add_push_actions_to_staging iterates over it.
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# If the event shouldn't be marked as unread but should notify the
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# current user, it'll be added to the dict later.
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actions_by_user[uid] = []
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for rule, enabled in rules:
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if not enabled:
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continue
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matches = evaluator.check_conditions(rule.conditions, uid, display_name)
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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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await self.store.add_push_actions_to_staging(
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event.event_id,
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actions_by_user,
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count_as_unread,
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)
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MemberMap = Dict[str, Optional[EventIdMembership]]
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Rule = Dict[str, dict]
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RulesByUser = Dict[str, List[Rule]]
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StateGroup = Union[object, int]
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