Add basic full text search impl.

synapse/storage/search.py

@@ -0,0 +1,75 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 OpenMarket 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.
+
+from twisted.internet import defer
+
+from _base import SQLBaseStore
+from synapse.api.constants import KnownRoomEventKeys, SearchConstraintTypes
+
+
+class SearchStore(SQLBaseStore):
+    @defer.inlineCallbacks
+    def search_msgs(self, constraints):
+        clauses = []
+        args = []
+        fts = None
+
+        for c in constraints:
+            local_clauses = []
+            if c.search_type == SearchConstraintTypes.FTS:
+                fts = c.value
+                for key in c.keys:
+                    local_clauses.append("key = ?")
+                    args.append(key)
+            elif c.search_type == SearchConstraintTypes.EXACT:
+                for key in c.keys:
+                    if key == KnownRoomEventKeys.ROOM_ID:
+                        for value in c.value:
+                            local_clauses.append("room_id = ?")
+                            args.append(value)
+            clauses.append(
+                "(%s)" % (" OR ".join(local_clauses),)
+            )
+
+        sql = (
+            "SELECT ts_rank_cd(vector, query) AS rank, event_id"
+            " FROM plainto_tsquery('english', ?) as query, event_search"
+            " WHERE vector @@ query"
+        )
+
+        for clause in clauses:
+            sql += " AND " + clause
+
+        sql += " ORDER BY rank DESC"
+
+        results = yield self._execute(
+            "search_msgs", self.cursor_to_dict, sql, *([fts] + args)
+        )
+
+        events = yield self._get_events([r["event_id"] for r in results])
+
+        event_map = {
+            ev.event_id: ev
+            for ev in events
+        }
+
+        defer.returnValue([
+            {
+                "rank": r["rank"],
+                "result": event_map[r["event_id"]]
+            }
+            for r in results
+            if r["event_id"] in event_map
+        ])