MatrixSynapse/synapse/push/bulk_push_rule_evaluator.py

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# Copyright 2015 OpenMarket Ltd
# Copyright 2017 New Vector 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.
import itertools
import logging
from typing import (
TYPE_CHECKING,
Collection,
Dict,
Iterable,
List,
Mapping,
Optional,
Set,
Tuple,
Union,
)
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from prometheus_client import Counter
from synapse.api.constants import EventTypes, Membership, RelationTypes
from synapse.event_auth import auth_types_for_event, get_user_power_level
from synapse.events import EventBase, relation_from_event
from synapse.events.snapshot import EventContext
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from synapse.state import POWER_KEY
from synapse.storage.databases.main.roommember import EventIdMembership
from synapse.storage.state import StateFilter
from synapse.util.caches import register_cache
from synapse.util.metrics import measure_func
from synapse.visibility import filter_event_for_clients_with_state
from .baserules import FilteredPushRules, PushRule
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from .push_rule_evaluator import PushRuleEvaluatorForEvent
if TYPE_CHECKING:
from synapse.server import HomeServer
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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push_rules_state_size_counter = Counter(
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"synapse_push_bulk_push_rule_evaluator_push_rules_state_size_counter", ""
)
STATE_EVENT_TYPES_TO_MARK_UNREAD = {
EventTypes.Topic,
EventTypes.Name,
EventTypes.RoomAvatar,
EventTypes.Tombstone,
}
def _should_count_as_unread(event: EventBase, context: EventContext) -> bool:
# Exclude rejected and soft-failed events.
if context.rejected or event.internal_metadata.is_soft_failed():
return False
# Exclude notices.
if (
not event.is_state()
and event.type == EventTypes.Message
and event.content.get("msgtype") == "m.notice"
):
return False
# Exclude edits.
relates_to = relation_from_event(event)
if relates_to and relates_to.rel_type == RelationTypes.REPLACE:
return False
# Mark events that have a non-empty string body as unread.
body = event.content.get("body")
if isinstance(body, str) and body:
return True
# Mark some state events as unread.
if event.is_state() and event.type in STATE_EVENT_TYPES_TO_MARK_UNREAD:
return True
# Mark encrypted events as unread.
if not event.is_state() and event.type == EventTypes.Encrypted:
return True
return False
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class BulkPushRuleEvaluator:
"""Calculates the outcome of push rules for an event for all users in the
room at once.
"""
def __init__(self, hs: "HomeServer"):
self.hs = hs
self.store = hs.get_datastores().main
self.clock = hs.get_clock()
self._event_auth_handler = hs.get_event_auth_handler()
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self.room_push_rule_cache_metrics = register_cache(
"cache",
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"room_push_rule_cache",
cache=[], # Meaningless size, as this isn't a cache that stores values,
resizable=False,
)
# Whether to support MSC3772 is supported.
self._relations_match_enabled = self.hs.config.experimental.msc3772_enabled
async def _get_rules_for_event(
self,
event: EventBase,
) -> Dict[str, FilteredPushRules]:
"""Get the push rules for all users who may need to be notified about
the event.
Note: this does not check if the user is allowed to see the event.
Returns:
Mapping of user ID to their push rules.
"""
# We get the users who may need to be notified by first fetching the
# local users currently in the room, finding those that have push rules,
# and *then* checking which users are actually allowed to see the event.
#
# The alternative is to first fetch all users that were joined at the
# event, but that requires fetching the full state at the event, which
# may be expensive for large rooms with few local users.
local_users = await self.store.get_local_users_in_room(event.room_id)
# Filter out appservice users.
local_users = [
u
for u in local_users
if not self.store.get_if_app_services_interested_in_user(u)
]
# if this event is an invite event, we may need to run rules for the user
# who's been invited, otherwise they won't get told they've been invited
if event.type == EventTypes.Member and event.membership == Membership.INVITE:
invited = event.state_key
if invited and self.hs.is_mine_id(invited) and invited not in local_users:
local_users = list(local_users)
local_users.append(invited)
rules_by_user = await self.store.bulk_get_push_rules(local_users)
logger.debug("Users in room: %s", local_users)
if logger.isEnabledFor(logging.DEBUG):
logger.debug(
"Returning push rules for %r %r",
event.room_id,
list(rules_by_user.keys()),
)
return rules_by_user
async def _get_power_levels_and_sender_level(
self, event: EventBase, context: EventContext
) -> Tuple[dict, int]:
event_types = auth_types_for_event(event.room_version, event)
prev_state_ids = await context.get_prev_state_ids(
StateFilter.from_types(event_types)
)
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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
# not having a power level event is an extreme edge case
auth_events = {POWER_KEY: await self.store.get_event(pl_event_id)}
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else:
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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)
auth_events_dict = await self.store.get_events(auth_events_ids)
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)
pl_event = auth_events.get(POWER_KEY)
return pl_event.content if pl_event else {}, sender_level
async def _get_mutual_relations(
self, event: EventBase, rules: Iterable[Tuple[PushRule, bool]]
) -> Dict[str, Set[Tuple[str, str]]]:
"""
Fetch event metadata for events which related to the same event as the given event.
If the given event has no relation information, returns an empty dictionary.
Args:
event_id: The event ID which is targeted by relations.
rules: The push rules which will be processed for this event.
Returns:
A dictionary of relation type to:
A set of tuples of:
The sender
The event type
"""
# If the experimental feature is not enabled, skip fetching relations.
if not self._relations_match_enabled:
return {}
# If the event does not have a relation, then cannot have any mutual
# relations.
relation = relation_from_event(event)
if not relation:
return {}
# Pre-filter to figure out which relation types are interesting.
rel_types = set()
for rule, enabled in rules:
if not enabled:
continue
for condition in rule.conditions:
if condition["kind"] != "org.matrix.msc3772.relation_match":
continue
# rel_type is required.
rel_type = condition.get("rel_type")
if rel_type:
rel_types.add(rel_type)
# If no valid rules were found, no mutual relations.
if not rel_types:
return {}
# If any valid rules were found, fetch the mutual relations.
return await self.store.get_mutual_event_relations(
relation.parent_id, rel_types
)
@measure_func("action_for_event_by_user")
async def action_for_event_by_user(
self, event: EventBase, context: EventContext
) -> None:
"""Given an event and context, evaluate the push rules, check if the message
should increment the unread count, and insert the results into the
event_push_actions_staging table.
"""
if event.internal_metadata.is_outlier():
# This can happen due to out of band memberships
return
# Disable counting as unread unless the experimental configuration is
# enabled, as it can cause additional (unwanted) rows to be added to the
# event_push_actions table.
count_as_unread = False
if self.hs.config.experimental.msc2654_enabled:
count_as_unread = _should_count_as_unread(event, context)
rules_by_user = await self._get_rules_for_event(event)
actions_by_user: Dict[str, Collection[Union[Mapping, str]]] = {}
room_member_count = await self.store.get_number_joined_users_in_room(
event.room_id
)
(
power_levels,
sender_power_level,
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) = await self._get_power_levels_and_sender_level(event, context)
relations = await self._get_mutual_relations(
event, itertools.chain(*rules_by_user.values())
)
evaluator = PushRuleEvaluatorForEvent(
event,
room_member_count,
sender_power_level,
power_levels,
relations,
self._relations_match_enabled,
)
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users = rules_by_user.keys()
profiles = await self.store.get_subset_users_in_room_with_profiles(
event.room_id, users
)
# This is a check for the case where user joins a room without being
# allowed to see history, and then the server receives a delayed event
# from before the user joined, which they should not be pushed for
uids_with_visibility = await filter_event_for_clients_with_state(
self.store, users, event, context
)
for uid, rules in rules_by_user.items():
if event.sender == uid:
continue
if uid not in uids_with_visibility:
continue
display_name = None
profile = profiles.get(uid)
if profile:
display_name = profile.display_name
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if not display_name:
# Handle the case where we are pushing a membership event to
# that user, as they might not be already joined.
if event.type == EventTypes.Member and event.state_key == uid:
display_name = event.content.get("displayname", None)
if not isinstance(display_name, str):
display_name = None
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if count_as_unread:
# Add an element for the current user if the event needs to be marked as
# unread, so that add_push_actions_to_staging iterates over it.
# If the event shouldn't be marked as unread but should notify the
# current user, it'll be added to the dict later.
actions_by_user[uid] = []
for rule, enabled in rules:
if not enabled:
continue
matches = evaluator.check_conditions(rule.conditions, uid, display_name)
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if matches:
actions = [x for x in rule.actions if x != "dont_notify"]
if actions and "notify" in actions:
# Push rules say we should notify the user of this event
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actions_by_user[uid] = actions
break
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# Mark in the DB staging area the push actions for users who should be
# notified for this event. (This will then get handled when we persist
# the event)
await self.store.add_push_actions_to_staging(
event.event_id,
actions_by_user,
count_as_unread,
)
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MemberMap = Dict[str, Optional[EventIdMembership]]
Rule = Dict[str, dict]
RulesByUser = Dict[str, List[Rule]]
StateGroup = Union[object, int]