# Copyright 2014-2016 OpenMarket Ltd # Copyright 2018 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 abc import logging from typing import TYPE_CHECKING, Dict, List, Tuple, Union from synapse.api.errors import NotFoundError, StoreError from synapse.push.baserules import list_with_base_rules from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker from synapse.storage._base import SQLBaseStore, db_to_json from synapse.storage.database import DatabasePool, LoggingDatabaseConnection from synapse.storage.databases.main.appservice import ApplicationServiceWorkerStore from synapse.storage.databases.main.events_worker import EventsWorkerStore from synapse.storage.databases.main.pusher import PusherWorkerStore from synapse.storage.databases.main.receipts import ReceiptsWorkerStore from synapse.storage.databases.main.roommember import RoomMemberWorkerStore from synapse.storage.engines import PostgresEngine, Sqlite3Engine from synapse.storage.push_rule import InconsistentRuleException, RuleNotFoundException from synapse.storage.util.id_generators import ( AbstractStreamIdTracker, StreamIdGenerator, ) from synapse.util import json_encoder from synapse.util.caches.descriptors import cached, cachedList from synapse.util.caches.stream_change_cache import StreamChangeCache if TYPE_CHECKING: from synapse.server import HomeServer logger = logging.getLogger(__name__) def _load_rules(rawrules, enabled_map, use_new_defaults=False): ruleslist = [] for rawrule in rawrules: rule = dict(rawrule) rule["conditions"] = db_to_json(rawrule["conditions"]) rule["actions"] = db_to_json(rawrule["actions"]) rule["default"] = False ruleslist.append(rule) # We're going to be mutating this a lot, so do a deep copy rules = list(list_with_base_rules(ruleslist, use_new_defaults)) for i, rule in enumerate(rules): rule_id = rule["rule_id"] if rule_id in enabled_map: if rule.get("enabled", True) != bool(enabled_map[rule_id]): # Rules are cached across users. rule = dict(rule) rule["enabled"] = bool(enabled_map[rule_id]) rules[i] = rule return rules # The ABCMeta metaclass ensures that it cannot be instantiated without # the abstract methods being implemented. class PushRulesWorkerStore( ApplicationServiceWorkerStore, ReceiptsWorkerStore, PusherWorkerStore, RoomMemberWorkerStore, EventsWorkerStore, SQLBaseStore, metaclass=abc.ABCMeta, ): """This is an abstract base class where subclasses must implement `get_max_push_rules_stream_id` which can be called in the initializer. """ def __init__( self, database: DatabasePool, db_conn: LoggingDatabaseConnection, hs: "HomeServer", ): super().__init__(database, db_conn, hs) if hs.config.worker.worker_app is None: self._push_rules_stream_id_gen: AbstractStreamIdTracker = StreamIdGenerator( db_conn, "push_rules_stream", "stream_id" ) else: self._push_rules_stream_id_gen = SlavedIdTracker( db_conn, "push_rules_stream", "stream_id" ) push_rules_prefill, push_rules_id = self.db_pool.get_cache_dict( db_conn, "push_rules_stream", entity_column="user_id", stream_column="stream_id", max_value=self.get_max_push_rules_stream_id(), ) self.push_rules_stream_cache = StreamChangeCache( "PushRulesStreamChangeCache", push_rules_id, prefilled_cache=push_rules_prefill, ) self._users_new_default_push_rules = ( hs.config.server.users_new_default_push_rules ) @abc.abstractmethod def get_max_push_rules_stream_id(self): """Get the position of the push rules stream. Returns: int """ raise NotImplementedError() @cached(max_entries=5000) async def get_push_rules_for_user(self, user_id): rows = await self.db_pool.simple_select_list( table="push_rules", keyvalues={"user_name": user_id}, retcols=( "user_name", "rule_id", "priority_class", "priority", "conditions", "actions", ), desc="get_push_rules_enabled_for_user", ) rows.sort(key=lambda row: (-int(row["priority_class"]), -int(row["priority"]))) enabled_map = await self.get_push_rules_enabled_for_user(user_id) use_new_defaults = user_id in self._users_new_default_push_rules return _load_rules(rows, enabled_map, use_new_defaults) @cached(max_entries=5000) async def get_push_rules_enabled_for_user(self, user_id) -> Dict[str, bool]: results = await self.db_pool.simple_select_list( table="push_rules_enable", keyvalues={"user_name": user_id}, retcols=("user_name", "rule_id", "enabled"), desc="get_push_rules_enabled_for_user", ) return {r["rule_id"]: False if r["enabled"] == 0 else True for r in results} async def have_push_rules_changed_for_user( self, user_id: str, last_id: int ) -> bool: if not self.push_rules_stream_cache.has_entity_changed(user_id, last_id): return False else: def have_push_rules_changed_txn(txn): sql = ( "SELECT COUNT(stream_id) FROM push_rules_stream" " WHERE user_id = ? AND ? < stream_id" ) txn.execute(sql, (user_id, last_id)) (count,) = txn.fetchone() return bool(count) return await self.db_pool.runInteraction( "have_push_rules_changed", have_push_rules_changed_txn ) @cachedList( cached_method_name="get_push_rules_for_user", list_name="user_ids", num_args=1, ) async def bulk_get_push_rules(self, user_ids): if not user_ids: return {} results = {user_id: [] for user_id in user_ids} rows = await self.db_pool.simple_select_many_batch( table="push_rules", column="user_name", iterable=user_ids, retcols=("*",), desc="bulk_get_push_rules", ) rows.sort(key=lambda row: (-int(row["priority_class"]), -int(row["priority"]))) for row in rows: results.setdefault(row["user_name"], []).append(row) enabled_map_by_user = await self.bulk_get_push_rules_enabled(user_ids) for user_id, rules in results.items(): use_new_defaults = user_id in self._users_new_default_push_rules results[user_id] = _load_rules( rules, enabled_map_by_user.get(user_id, {}), use_new_defaults, ) return results async def copy_push_rule_from_room_to_room( self, new_room_id: str, user_id: str, rule: dict ) -> None: """Copy a single push rule from one room to another for a specific user. Args: new_room_id: ID of the new room. user_id : ID of user the push rule belongs to. rule: A push rule. """ # Create new rule id rule_id_scope = "/".join(rule["rule_id"].split("/")[:-1]) new_rule_id = rule_id_scope + "/" + new_room_id # Change room id in each condition for condition in rule.get("conditions", []): if condition.get("key") == "room_id": condition["pattern"] = new_room_id # Add the rule for the new room await self.add_push_rule( user_id=user_id, rule_id=new_rule_id, priority_class=rule["priority_class"], conditions=rule["conditions"], actions=rule["actions"], ) async def copy_push_rules_from_room_to_room_for_user( self, old_room_id: str, new_room_id: str, user_id: str ) -> None: """Copy all of the push rules from one room to another for a specific user. Args: old_room_id: ID of the old room. new_room_id: ID of the new room. user_id: ID of user to copy push rules for. """ # Retrieve push rules for this user user_push_rules = await self.get_push_rules_for_user(user_id) # Get rules relating to the old room and copy them to the new room for rule in user_push_rules: conditions = rule.get("conditions", []) if any( (c.get("key") == "room_id" and c.get("pattern") == old_room_id) for c in conditions ): await self.copy_push_rule_from_room_to_room(new_room_id, user_id, rule) @cachedList( cached_method_name="get_push_rules_enabled_for_user", list_name="user_ids", num_args=1, ) async def bulk_get_push_rules_enabled(self, user_ids): if not user_ids: return {} results = {user_id: {} for user_id in user_ids} rows = await self.db_pool.simple_select_many_batch( table="push_rules_enable", column="user_name", iterable=user_ids, retcols=("user_name", "rule_id", "enabled"), desc="bulk_get_push_rules_enabled", ) for row in rows: enabled = bool(row["enabled"]) results.setdefault(row["user_name"], {})[row["rule_id"]] = enabled return results async def get_all_push_rule_updates( self, instance_name: str, last_id: int, current_id: int, limit: int ) -> Tuple[List[Tuple[int, tuple]], int, bool]: """Get updates for push_rules replication stream. Args: instance_name: The writer we want to fetch updates from. Unused here since there is only ever one writer. last_id: The token to fetch updates from. Exclusive. current_id: The token to fetch updates up to. Inclusive. limit: The requested limit for the number of rows to return. The function may return more or fewer rows. Returns: A tuple consisting of: the updates, a token to use to fetch subsequent updates, and whether we returned fewer rows than exists between the requested tokens due to the limit. The token returned can be used in a subsequent call to this function to get further updatees. The updates are a list of 2-tuples of stream ID and the row data """ if last_id == current_id: return [], current_id, False def get_all_push_rule_updates_txn(txn): sql = """ SELECT stream_id, user_id FROM push_rules_stream WHERE ? < stream_id AND stream_id <= ? ORDER BY stream_id ASC LIMIT ? """ txn.execute(sql, (last_id, current_id, limit)) updates = [(stream_id, (user_id,)) for stream_id, user_id in txn] limited = False upper_bound = current_id if len(updates) == limit: limited = True upper_bound = updates[-1][0] return updates, upper_bound, limited return await self.db_pool.runInteraction( "get_all_push_rule_updates", get_all_push_rule_updates_txn ) class PushRuleStore(PushRulesWorkerStore): async def add_push_rule( self, user_id, rule_id, priority_class, conditions, actions, before=None, after=None, ) -> None: conditions_json = json_encoder.encode(conditions) actions_json = json_encoder.encode(actions) async with self._push_rules_stream_id_gen.get_next() as stream_id: event_stream_ordering = self._stream_id_gen.get_current_token() if before or after: await self.db_pool.runInteraction( "_add_push_rule_relative_txn", self._add_push_rule_relative_txn, stream_id, event_stream_ordering, user_id, rule_id, priority_class, conditions_json, actions_json, before, after, ) else: await self.db_pool.runInteraction( "_add_push_rule_highest_priority_txn", self._add_push_rule_highest_priority_txn, stream_id, event_stream_ordering, user_id, rule_id, priority_class, conditions_json, actions_json, ) def _add_push_rule_relative_txn( self, txn, stream_id, event_stream_ordering, user_id, rule_id, priority_class, conditions_json, actions_json, before, after, ): # Lock the table since otherwise we'll have annoying races between the # SELECT here and the UPSERT below. self.database_engine.lock_table(txn, "push_rules") relative_to_rule = before or after res = self.db_pool.simple_select_one_txn( txn, table="push_rules", keyvalues={"user_name": user_id, "rule_id": relative_to_rule}, retcols=["priority_class", "priority"], allow_none=True, ) if not res: raise RuleNotFoundException( "before/after rule not found: %s" % (relative_to_rule,) ) base_priority_class = res["priority_class"] base_rule_priority = res["priority"] if base_priority_class != priority_class: raise InconsistentRuleException( "Given priority class does not match class of relative rule" ) if before: # Higher priority rules are executed first, So adding a rule before # a rule means giving it a higher priority than that rule. new_rule_priority = base_rule_priority + 1 else: # We increment the priority of the existing rules to make space for # the new rule. Therefore if we want this rule to appear after # an existing rule we give it the priority of the existing rule, # and then increment the priority of the existing rule. new_rule_priority = base_rule_priority sql = ( "UPDATE push_rules SET priority = priority + 1" " WHERE user_name = ? AND priority_class = ? AND priority >= ?" ) txn.execute(sql, (user_id, priority_class, new_rule_priority)) self._upsert_push_rule_txn( txn, stream_id, event_stream_ordering, user_id, rule_id, priority_class, new_rule_priority, conditions_json, actions_json, ) def _add_push_rule_highest_priority_txn( self, txn, stream_id, event_stream_ordering, user_id, rule_id, priority_class, conditions_json, actions_json, ): # Lock the table since otherwise we'll have annoying races between the # SELECT here and the UPSERT below. self.database_engine.lock_table(txn, "push_rules") # find the highest priority rule in that class sql = ( "SELECT COUNT(*), MAX(priority) FROM push_rules" " WHERE user_name = ? and priority_class = ?" ) txn.execute(sql, (user_id, priority_class)) res = txn.fetchall() (how_many, highest_prio) = res[0] new_prio = 0 if how_many > 0: new_prio = highest_prio + 1 self._upsert_push_rule_txn( txn, stream_id, event_stream_ordering, user_id, rule_id, priority_class, new_prio, conditions_json, actions_json, ) def _upsert_push_rule_txn( self, txn, stream_id, event_stream_ordering, user_id, rule_id, priority_class, priority, conditions_json, actions_json, update_stream=True, ): """Specialised version of simple_upsert_txn that picks a push_rule_id using the _push_rule_id_gen if it needs to insert the rule. It assumes that the "push_rules" table is locked""" sql = ( "UPDATE push_rules" " SET priority_class = ?, priority = ?, conditions = ?, actions = ?" " WHERE user_name = ? AND rule_id = ?" ) txn.execute( sql, (priority_class, priority, conditions_json, actions_json, user_id, rule_id), ) if txn.rowcount == 0: # We didn't update a row with the given rule_id so insert one push_rule_id = self._push_rule_id_gen.get_next() self.db_pool.simple_insert_txn( txn, table="push_rules", values={ "id": push_rule_id, "user_name": user_id, "rule_id": rule_id, "priority_class": priority_class, "priority": priority, "conditions": conditions_json, "actions": actions_json, }, ) if update_stream: self._insert_push_rules_update_txn( txn, stream_id, event_stream_ordering, user_id, rule_id, op="ADD", data={ "priority_class": priority_class, "priority": priority, "conditions": conditions_json, "actions": actions_json, }, ) # ensure we have a push_rules_enable row # enabledness defaults to true if isinstance(self.database_engine, PostgresEngine): sql = """ INSERT INTO push_rules_enable (id, user_name, rule_id, enabled) VALUES (?, ?, ?, ?) ON CONFLICT DO NOTHING """ elif isinstance(self.database_engine, Sqlite3Engine): sql = """ INSERT OR IGNORE INTO push_rules_enable (id, user_name, rule_id, enabled) VALUES (?, ?, ?, ?) """ else: raise RuntimeError("Unknown database engine") new_enable_id = self._push_rules_enable_id_gen.get_next() txn.execute(sql, (new_enable_id, user_id, rule_id, 1)) async def delete_push_rule(self, user_id: str, rule_id: str) -> None: """ Delete a push rule. Args specify the row to be deleted and can be any of the columns in the push_rule table, but below are the standard ones Args: user_id: The matrix ID of the push rule owner rule_id: The rule_id of the rule to be deleted """ def delete_push_rule_txn(txn, stream_id, event_stream_ordering): # we don't use simple_delete_one_txn because that would fail if the # user did not have a push_rule_enable row. self.db_pool.simple_delete_txn( txn, "push_rules_enable", {"user_name": user_id, "rule_id": rule_id} ) self.db_pool.simple_delete_one_txn( txn, "push_rules", {"user_name": user_id, "rule_id": rule_id} ) self._insert_push_rules_update_txn( txn, stream_id, event_stream_ordering, user_id, rule_id, op="DELETE" ) async with self._push_rules_stream_id_gen.get_next() as stream_id: event_stream_ordering = self._stream_id_gen.get_current_token() await self.db_pool.runInteraction( "delete_push_rule", delete_push_rule_txn, stream_id, event_stream_ordering, ) async def set_push_rule_enabled( self, user_id: str, rule_id: str, enabled: bool, is_default_rule: bool ) -> None: """ Sets the `enabled` state of a push rule. Args: user_id: the user ID of the user who wishes to enable/disable the rule e.g. '@tina:example.org' rule_id: the full rule ID of the rule to be enabled/disabled e.g. 'global/override/.m.rule.roomnotif' or 'global/override/myCustomRule' enabled: True if the rule is to be enabled, False if it is to be disabled is_default_rule: True if and only if this is a server-default rule. This skips the check for existence (as only user-created rules are always stored in the database `push_rules` table). Raises: NotFoundError if the rule does not exist. """ async with self._push_rules_stream_id_gen.get_next() as stream_id: event_stream_ordering = self._stream_id_gen.get_current_token() await self.db_pool.runInteraction( "_set_push_rule_enabled_txn", self._set_push_rule_enabled_txn, stream_id, event_stream_ordering, user_id, rule_id, enabled, is_default_rule, ) def _set_push_rule_enabled_txn( self, txn, stream_id, event_stream_ordering, user_id, rule_id, enabled, is_default_rule, ): new_id = self._push_rules_enable_id_gen.get_next() if not is_default_rule: # first check it exists; we need to lock for key share so that a # transaction that deletes the push rule will conflict with this one. # We also need a push_rule_enable row to exist for every push_rules # row, otherwise it is possible to simultaneously delete a push rule # (that has no _enable row) and enable it, resulting in a dangling # _enable row. To solve this: we either need to use SERIALISABLE or # ensure we always have a push_rule_enable row for every push_rule # row. We chose the latter. for_key_share = "FOR KEY SHARE" if not isinstance(self.database_engine, PostgresEngine): # For key share is not applicable/available on SQLite for_key_share = "" sql = ( """ SELECT 1 FROM push_rules WHERE user_name = ? AND rule_id = ? %s """ % for_key_share ) txn.execute(sql, (user_id, rule_id)) if txn.fetchone() is None: # needed to set NOT_FOUND code. raise NotFoundError("Push rule does not exist.") self.db_pool.simple_upsert_txn( txn, "push_rules_enable", {"user_name": user_id, "rule_id": rule_id}, {"enabled": 1 if enabled else 0}, {"id": new_id}, ) self._insert_push_rules_update_txn( txn, stream_id, event_stream_ordering, user_id, rule_id, op="ENABLE" if enabled else "DISABLE", ) async def set_push_rule_actions( self, user_id: str, rule_id: str, actions: List[Union[dict, str]], is_default_rule: bool, ) -> None: """ Sets the `actions` state of a push rule. Will throw NotFoundError if the rule does not exist; the Code for this is NOT_FOUND. Args: user_id: the user ID of the user who wishes to enable/disable the rule e.g. '@tina:example.org' rule_id: the full rule ID of the rule to be enabled/disabled e.g. 'global/override/.m.rule.roomnotif' or 'global/override/myCustomRule' actions: A list of actions (each action being a dict or string), e.g. ["notify", {"set_tweak": "highlight", "value": false}] is_default_rule: True if and only if this is a server-default rule. This skips the check for existence (as only user-created rules are always stored in the database `push_rules` table). """ actions_json = json_encoder.encode(actions) def set_push_rule_actions_txn(txn, stream_id, event_stream_ordering): if is_default_rule: # Add a dummy rule to the rules table with the user specified # actions. priority_class = -1 priority = 1 self._upsert_push_rule_txn( txn, stream_id, event_stream_ordering, user_id, rule_id, priority_class, priority, "[]", actions_json, update_stream=False, ) else: try: self.db_pool.simple_update_one_txn( txn, "push_rules", {"user_name": user_id, "rule_id": rule_id}, {"actions": actions_json}, ) except StoreError as serr: if serr.code == 404: # this sets the NOT_FOUND error Code raise NotFoundError("Push rule does not exist") else: raise self._insert_push_rules_update_txn( txn, stream_id, event_stream_ordering, user_id, rule_id, op="ACTIONS", data={"actions": actions_json}, ) async with self._push_rules_stream_id_gen.get_next() as stream_id: event_stream_ordering = self._stream_id_gen.get_current_token() await self.db_pool.runInteraction( "set_push_rule_actions", set_push_rule_actions_txn, stream_id, event_stream_ordering, ) def _insert_push_rules_update_txn( self, txn, stream_id, event_stream_ordering, user_id, rule_id, op, data=None ): values = { "stream_id": stream_id, "event_stream_ordering": event_stream_ordering, "user_id": user_id, "rule_id": rule_id, "op": op, } if data is not None: values.update(data) self.db_pool.simple_insert_txn(txn, "push_rules_stream", values=values) txn.call_after(self.get_push_rules_for_user.invalidate, (user_id,)) txn.call_after(self.get_push_rules_enabled_for_user.invalidate, (user_id,)) txn.call_after( self.push_rules_stream_cache.entity_has_changed, user_id, stream_id ) def get_max_push_rules_stream_id(self): return self._push_rules_stream_id_gen.get_current_token()