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112 lines
3.5 KiB
Python
112 lines
3.5 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 _base import SQLBaseStore
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from synapse.storage.engines import PostgresEngine, Sqlite3Engine
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from collections import namedtuple
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"""The result of a search.
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Fields:
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rank_map (dict): Mapping event_id -> rank
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event_map (dict): Mapping event_id -> event
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pagination_token (str): Pagination token
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"""
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SearchResult = namedtuple("SearchResult", ("rank_map", "event_map", "pagination_token"))
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class SearchStore(SQLBaseStore):
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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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SearchResult
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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(SearchResult(
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{
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r["event_id"]: r["rank"]
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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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event_map,
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None
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))
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