# -*- coding: utf-8 -*- # Copyright 2019 The Matrix.org Foundation C.I.C. # # 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 logging from six import text_type from canonicaljson import json from twisted.internet import defer from synapse.storage.background_updates import BackgroundUpdateStore logger = logging.getLogger(__name__) class EventsBackgroundUpdatesStore(BackgroundUpdateStore): EVENT_ORIGIN_SERVER_TS_NAME = "event_origin_server_ts" EVENT_FIELDS_SENDER_URL_UPDATE_NAME = "event_fields_sender_url" EVENT_DELETE_SOFT_FAILED_EXTREMITIES = "delete_soft_failed_extremities" def __init__(self, db_conn, hs): super(EventsBackgroundUpdatesStore, self).__init__(db_conn, hs) self.register_background_update_handler( self.EVENT_ORIGIN_SERVER_TS_NAME, self._background_reindex_origin_server_ts ) self.register_background_update_handler( self.EVENT_FIELDS_SENDER_URL_UPDATE_NAME, self._background_reindex_fields_sender, ) self.register_background_index_update( "event_contains_url_index", index_name="event_contains_url_index", table="events", columns=["room_id", "topological_ordering", "stream_ordering"], where_clause="contains_url = true AND outlier = false", ) # an event_id index on event_search is useful for the purge_history # api. Plus it means we get to enforce some integrity with a UNIQUE # clause self.register_background_index_update( "event_search_event_id_idx", index_name="event_search_event_id_idx", table="event_search", columns=["event_id"], unique=True, psql_only=True, ) self.register_background_update_handler( self.EVENT_DELETE_SOFT_FAILED_EXTREMITIES, self._cleanup_extremities_bg_update, ) @defer.inlineCallbacks def _background_reindex_fields_sender(self, progress, batch_size): target_min_stream_id = progress["target_min_stream_id_inclusive"] max_stream_id = progress["max_stream_id_exclusive"] rows_inserted = progress.get("rows_inserted", 0) INSERT_CLUMP_SIZE = 1000 def reindex_txn(txn): sql = ( "SELECT stream_ordering, event_id, json FROM events" " INNER JOIN event_json USING (event_id)" " WHERE ? <= stream_ordering AND stream_ordering < ?" " ORDER BY stream_ordering DESC" " LIMIT ?" ) txn.execute(sql, (target_min_stream_id, max_stream_id, batch_size)) rows = txn.fetchall() if not rows: return 0 min_stream_id = rows[-1][0] update_rows = [] for row in rows: try: event_id = row[1] event_json = json.loads(row[2]) sender = event_json["sender"] content = event_json["content"] contains_url = "url" in content if contains_url: contains_url &= isinstance(content["url"], text_type) except (KeyError, AttributeError): # If the event is missing a necessary field then # skip over it. continue update_rows.append((sender, contains_url, event_id)) sql = "UPDATE events SET sender = ?, contains_url = ? WHERE event_id = ?" for index in range(0, len(update_rows), INSERT_CLUMP_SIZE): clump = update_rows[index : index + INSERT_CLUMP_SIZE] txn.executemany(sql, clump) progress = { "target_min_stream_id_inclusive": target_min_stream_id, "max_stream_id_exclusive": min_stream_id, "rows_inserted": rows_inserted + len(rows), } self._background_update_progress_txn( txn, self.EVENT_FIELDS_SENDER_URL_UPDATE_NAME, progress ) return len(rows) result = yield self.runInteraction( self.EVENT_FIELDS_SENDER_URL_UPDATE_NAME, reindex_txn ) if not result: yield self._end_background_update(self.EVENT_FIELDS_SENDER_URL_UPDATE_NAME) defer.returnValue(result) @defer.inlineCallbacks def _background_reindex_origin_server_ts(self, progress, batch_size): target_min_stream_id = progress["target_min_stream_id_inclusive"] max_stream_id = progress["max_stream_id_exclusive"] rows_inserted = progress.get("rows_inserted", 0) INSERT_CLUMP_SIZE = 1000 def reindex_search_txn(txn): sql = ( "SELECT stream_ordering, event_id FROM events" " WHERE ? <= stream_ordering AND stream_ordering < ?" " ORDER BY stream_ordering DESC" " LIMIT ?" ) txn.execute(sql, (target_min_stream_id, max_stream_id, batch_size)) rows = txn.fetchall() if not rows: return 0 min_stream_id = rows[-1][0] event_ids = [row[1] for row in rows] rows_to_update = [] chunks = [event_ids[i : i + 100] for i in range(0, len(event_ids), 100)] for chunk in chunks: ev_rows = self._simple_select_many_txn( txn, table="event_json", column="event_id", iterable=chunk, retcols=["event_id", "json"], keyvalues={}, ) for row in ev_rows: event_id = row["event_id"] event_json = json.loads(row["json"]) try: origin_server_ts = event_json["origin_server_ts"] except (KeyError, AttributeError): # If the event is missing a necessary field then # skip over it. continue rows_to_update.append((origin_server_ts, event_id)) sql = "UPDATE events SET origin_server_ts = ? WHERE event_id = ?" for index in range(0, len(rows_to_update), INSERT_CLUMP_SIZE): clump = rows_to_update[index : index + INSERT_CLUMP_SIZE] txn.executemany(sql, clump) progress = { "target_min_stream_id_inclusive": target_min_stream_id, "max_stream_id_exclusive": min_stream_id, "rows_inserted": rows_inserted + len(rows_to_update), } self._background_update_progress_txn( txn, self.EVENT_ORIGIN_SERVER_TS_NAME, progress ) return len(rows_to_update) result = yield self.runInteraction( self.EVENT_ORIGIN_SERVER_TS_NAME, reindex_search_txn ) if not result: yield self._end_background_update(self.EVENT_ORIGIN_SERVER_TS_NAME) defer.returnValue(result) @defer.inlineCallbacks def _cleanup_extremities_bg_update(self, progress, batch_size): """Background update to clean out extremities that should have been deleted previously. Mainly used to deal with the aftermath of #5269. """ # This works by first copying all existing forward extremities into the # `_extremities_to_check` table at start up, and then checking each # event in that table whether we have any descendants that are not # soft-failed/rejected. If that is the case then we delete that event # from the forward extremities table. # # For efficiency, we do this in batches by recursively pulling out all # descendants of a batch until we find the non soft-failed/rejected # events, i.e. the set of descendants whose chain of prev events back # to the batch of extremities are all soft-failed or rejected. # Typically, we won't find any such events as extremities will rarely # have any descendants, but if they do then we should delete those # extremities. def _cleanup_extremities_bg_update_txn(txn): # The set of extremity event IDs that we're checking this round original_set = set() # A dict[str, set[str]] of event ID to their prev events. graph = {} # The set of descendants of the original set that are not rejected # nor soft-failed. Ancestors of these events should be removed # from the forward extremities table. non_rejected_leaves = set() # Set of event IDs that have been soft failed, and for which we # should check if they have descendants which haven't been soft # failed. soft_failed_events_to_lookup = set() # First, we get `batch_size` events from the table, pulling out # their successor events, if any, and their successor events # rejection status. txn.execute( """SELECT prev_event_id, event_id, internal_metadata, rejections.event_id IS NOT NULL, events.outlier FROM ( SELECT event_id AS prev_event_id FROM _extremities_to_check LIMIT ? ) AS f LEFT JOIN event_edges USING (prev_event_id) LEFT JOIN events USING (event_id) LEFT JOIN event_json USING (event_id) LEFT JOIN rejections USING (event_id) """, (batch_size,) ) for prev_event_id, event_id, metadata, rejected, outlier in txn: original_set.add(prev_event_id) if not event_id or outlier: # Common case where the forward extremity doesn't have any # descendants. continue graph.setdefault(event_id, set()).add(prev_event_id) soft_failed = False if metadata: soft_failed = json.loads(metadata).get("soft_failed") if soft_failed or rejected: soft_failed_events_to_lookup.add(event_id) else: non_rejected_leaves.add(event_id) # Now we recursively check all the soft-failed descendants we # found above in the same way, until we have nothing left to # check. while soft_failed_events_to_lookup: # We only want to do 100 at a time, so we split given list # into two. batch = list(soft_failed_events_to_lookup) to_check, to_defer = batch[:100], batch[100:] soft_failed_events_to_lookup = set(to_defer) sql = """SELECT prev_event_id, event_id, internal_metadata, rejections.event_id IS NOT NULL FROM event_edges INNER JOIN events USING (event_id) INNER JOIN event_json USING (event_id) LEFT JOIN rejections USING (event_id) WHERE prev_event_id IN (%s) AND NOT events.outlier """ % ( ",".join("?" for _ in to_check), ) txn.execute(sql, to_check) for prev_event_id, event_id, metadata, rejected in txn: if event_id in graph: # Already handled this event previously, but we still # want to record the edge. graph[event_id].add(prev_event_id) continue graph[event_id] = {prev_event_id} soft_failed = json.loads(metadata).get("soft_failed") if soft_failed or rejected: soft_failed_events_to_lookup.add(event_id) else: non_rejected_leaves.add(event_id) # We have a set of non-soft-failed descendants, so we recurse up # the graph to find all ancestors and add them to the set of event # IDs that we can delete from forward extremities table. to_delete = set() while non_rejected_leaves: event_id = non_rejected_leaves.pop() prev_event_ids = graph.get(event_id, set()) non_rejected_leaves.update(prev_event_ids) to_delete.update(prev_event_ids) to_delete.intersection_update(original_set) deleted = self._simple_delete_many_txn( txn=txn, table="event_forward_extremities", column="event_id", iterable=to_delete, keyvalues={}, ) logger.info( "Deleted %d forward extremities of %d checked, to clean up #5269", deleted, len(original_set), ) if deleted: # We now need to invalidate the caches of these rooms rows = self._simple_select_many_txn( txn, table="events", column="event_id", iterable=to_delete, keyvalues={}, retcols=("room_id",) ) room_ids = set(row["room_id"] for row in rows) for room_id in room_ids: txn.call_after( self.get_latest_event_ids_in_room.invalidate, (room_id,) ) self._simple_delete_many_txn( txn=txn, table="_extremities_to_check", column="event_id", iterable=original_set, keyvalues={}, ) return len(original_set) num_handled = yield self.runInteraction( "_cleanup_extremities_bg_update", _cleanup_extremities_bg_update_txn, ) if not num_handled: yield self._end_background_update(self.EVENT_DELETE_SOFT_FAILED_EXTREMITIES) def _drop_table_txn(txn): txn.execute("DROP TABLE _extremities_to_check") yield self.runInteraction( "_cleanup_extremities_bg_update_drop_table", _drop_table_txn, ) defer.returnValue(num_handled)