mirror of
https://git.anonymousland.org/anonymousland/synapse.git
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308 lines
11 KiB
Python
308 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 OpenMarket 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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from twisted.internet import defer
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from .background_updates import BackgroundUpdateStore
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from synapse.api.errors import SynapseError
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from synapse.storage.engines import PostgresEngine, Sqlite3Engine
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import logging
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logger = logging.getLogger(__name__)
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class SearchStore(BackgroundUpdateStore):
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EVENT_SEARCH_UPDATE_NAME = "event_search"
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def __init__(self, hs):
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super(SearchStore, self).__init__(hs)
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self.register_background_update_handler(
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self.EVENT_SEARCH_UPDATE_NAME, self._background_reindex_search
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)
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@defer.inlineCallbacks
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def _background_reindex_search(self, progress, batch_size):
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target_min_stream_id = progress["target_min_stream_id_inclusive"]
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max_stream_id = progress["max_stream_id_exclusive"]
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rows_inserted = progress.get("rows_inserted", 0)
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INSERT_CLUMP_SIZE = 1000
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TYPES = ["m.room.name", "m.room.message", "m.room.topic"]
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def reindex_search_txn(txn):
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sql = (
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"SELECT stream_ordering, event_id FROM events"
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" WHERE ? <= stream_ordering AND stream_ordering < ?"
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" AND (%s)"
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" ORDER BY stream_ordering DESC"
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" LIMIT ?"
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) % (" OR ".join("type = '%s'" % (t,) for t in TYPES),)
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txn.execute(sql, (target_min_stream_id, max_stream_id, batch_size))
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rows = txn.fetchall()
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if not rows:
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return 0
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min_stream_id = rows[-1][0]
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event_ids = [row[1] for row in rows]
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events = self._get_events_txn(txn, event_ids)
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event_search_rows = []
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for event in events:
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try:
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event_id = event.event_id
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room_id = event.room_id
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content = event.content
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if event.type == "m.room.message":
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key = "content.body"
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value = content["body"]
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elif event.type == "m.room.topic":
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key = "content.topic"
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value = content["topic"]
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elif event.type == "m.room.name":
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key = "content.name"
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value = content["name"]
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except (KeyError, AttributeError):
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# If the event is missing a necessary field then
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# skip over it.
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continue
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event_search_rows.append((event_id, room_id, key, value))
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if isinstance(self.database_engine, PostgresEngine):
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sql = (
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"INSERT INTO event_search (event_id, room_id, key, vector)"
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" VALUES (?,?,?,to_tsvector('english', ?))"
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)
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elif isinstance(self.database_engine, Sqlite3Engine):
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sql = (
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"INSERT INTO event_search (event_id, room_id, key, value)"
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" VALUES (?,?,?,?)"
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)
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else:
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# This should be unreachable.
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raise Exception("Unrecognized database engine")
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for index in range(0, len(event_search_rows), INSERT_CLUMP_SIZE):
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clump = event_search_rows[index:index + INSERT_CLUMP_SIZE]
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txn.executemany(sql, clump)
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progress = {
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"target_min_stream_id_inclusive": target_min_stream_id,
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"max_stream_id_exclusive": min_stream_id,
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"rows_inserted": rows_inserted + len(event_search_rows)
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}
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self._background_update_progress_txn(
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txn, self.EVENT_SEARCH_UPDATE_NAME, progress
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)
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return len(event_search_rows)
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result = yield self.runInteraction(
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self.EVENT_SEARCH_UPDATE_NAME, reindex_search_txn
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)
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if not result:
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yield self._end_background_update(self.EVENT_SEARCH_UPDATE_NAME)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def search_msgs(self, room_ids, search_term, keys):
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"""Performs a full text search over events with given keys.
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Args:
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room_ids (list): List of room ids to search in
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search_term (str): Search term to search for
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keys (list): List of keys to search in, currently supports
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"content.body", "content.name", "content.topic"
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Returns:
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list of dicts
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"""
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clauses = []
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args = []
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# Make sure we don't explode because the person is in too many rooms.
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# We filter the results below regardless.
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if len(room_ids) < 500:
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clauses.append(
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"room_id IN (%s)" % (",".join(["?"] * len(room_ids)),)
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)
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args.extend(room_ids)
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local_clauses = []
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for key in keys:
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local_clauses.append("key = ?")
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args.append(key)
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clauses.append(
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"(%s)" % (" OR ".join(local_clauses),)
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)
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if isinstance(self.database_engine, PostgresEngine):
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sql = (
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"SELECT ts_rank_cd(vector, query) AS rank, room_id, event_id"
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" FROM plainto_tsquery('english', ?) as query, event_search"
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" WHERE vector @@ query"
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)
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elif isinstance(self.database_engine, Sqlite3Engine):
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sql = (
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"SELECT rank(matchinfo(event_search)) as rank, room_id, event_id"
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" FROM event_search"
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" WHERE value MATCH ?"
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)
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else:
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# This should be unreachable.
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raise Exception("Unrecognized database engine")
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for clause in clauses:
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sql += " AND " + clause
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# We add an arbitrary limit here to ensure we don't try to pull the
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# entire table from the database.
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sql += " ORDER BY rank DESC LIMIT 500"
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results = yield self._execute(
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"search_msgs", self.cursor_to_dict, sql, *([search_term] + args)
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)
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results = filter(lambda row: row["room_id"] in room_ids, results)
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events = yield self._get_events([r["event_id"] for r in results])
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event_map = {
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ev.event_id: ev
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for ev in events
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}
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defer.returnValue([
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{
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"event": event_map[r["event_id"]],
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"rank": r["rank"],
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}
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for r in results
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if r["event_id"] in event_map
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])
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@defer.inlineCallbacks
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def search_room(self, room_id, search_term, keys, limit, pagination_token=None):
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"""Performs a full text search over events with given keys.
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Args:
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room_id (str): The room_id to search in
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search_term (str): Search term to search for
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keys (list): List of keys to search in, currently supports
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"content.body", "content.name", "content.topic"
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pagination_token (str): A pagination token previously returned
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Returns:
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list of dicts
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"""
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clauses = []
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args = [search_term, room_id]
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local_clauses = []
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for key in keys:
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local_clauses.append("key = ?")
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args.append(key)
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clauses.append(
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"(%s)" % (" OR ".join(local_clauses),)
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)
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if pagination_token:
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try:
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topo, stream = pagination_token.split(",")
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topo = int(topo)
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stream = int(stream)
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except:
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raise SynapseError(400, "Invalid pagination token")
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clauses.append(
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"(topological_ordering < ?"
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" OR (topological_ordering = ? AND stream_ordering < ?))"
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)
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args.extend([topo, topo, stream])
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if isinstance(self.database_engine, PostgresEngine):
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sql = (
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"SELECT ts_rank_cd(vector, query) as rank,"
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" topological_ordering, stream_ordering, room_id, event_id"
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" FROM plainto_tsquery('english', ?) as query, event_search"
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" NATURAL JOIN events"
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" WHERE vector @@ query AND room_id = ?"
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)
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elif isinstance(self.database_engine, Sqlite3Engine):
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# We use CROSS JOIN here to ensure we use the right indexes.
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# https://sqlite.org/optoverview.html#crossjoin
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#
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# We want to use the full text search index on event_search to
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# extract all possible matches first, then lookup those matches
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# in the events table to get the topological ordering. We need
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# to use the indexes in this order because sqlite refuses to
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# MATCH unless it uses the full text search index
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sql = (
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"SELECT rank(matchinfo) as rank, room_id, event_id,"
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" topological_ordering, stream_ordering"
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" FROM (SELECT key, event_id, matchinfo(event_search) as matchinfo"
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" FROM event_search"
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" WHERE value MATCH ?"
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" )"
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" CROSS JOIN events USING (event_id)"
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" WHERE room_id = ?"
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)
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else:
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# This should be unreachable.
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raise Exception("Unrecognized database engine")
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for clause in clauses:
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sql += " AND " + clause
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# We add an arbitrary limit here to ensure we don't try to pull the
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# entire table from the database.
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sql += " ORDER BY topological_ordering DESC, stream_ordering DESC LIMIT ?"
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args.append(limit)
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results = yield self._execute(
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"search_rooms", self.cursor_to_dict, sql, *args
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)
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events = yield self._get_events([r["event_id"] for r in results])
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event_map = {
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ev.event_id: ev
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for ev in events
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}
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defer.returnValue([
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{
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"event": event_map[r["event_id"]],
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"rank": r["rank"],
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"pagination_token": "%s,%s" % (
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r["topological_ordering"], r["stream_ordering"]
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),
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}
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for r in results
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if r["event_id"] in event_map
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])
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