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![Patrick Cloke](/assets/img/avatar_default.png)
Splits the search code into a few logical functions instead of a single unreadable function. There are also a few additional changes for readability. After refactoring it was clear to see there were some unused and unnecessary variables, which were simplified.
756 lines
27 KiB
Python
756 lines
27 KiB
Python
# Copyright 2015, 2016 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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import logging
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import re
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from typing import TYPE_CHECKING, Collection, Iterable, List, Optional, Set
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import attr
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from synapse.api.errors import SynapseError
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from synapse.events import EventBase
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from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
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from synapse.storage.database import (
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DatabasePool,
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LoggingDatabaseConnection,
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LoggingTransaction,
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)
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from synapse.storage.databases.main.events_worker import EventRedactBehaviour
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from synapse.storage.engines import PostgresEngine, Sqlite3Engine
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from synapse.types import JsonDict
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class SearchEntry:
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key: str
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value: str
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event_id: str
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room_id: str
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stream_ordering: Optional[int]
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origin_server_ts: int
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def _clean_value_for_search(value: str) -> str:
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"""
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Replaces any null code points in the string with spaces as
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Postgres and SQLite do not like the insertion of strings with
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null code points into the full-text search tables.
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"""
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return value.replace("\u0000", " ")
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class SearchWorkerStore(SQLBaseStore):
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def store_search_entries_txn(
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self, txn: LoggingTransaction, entries: Iterable[SearchEntry]
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) -> None:
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"""Add entries to the search table
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Args:
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txn:
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entries: entries to be added to the table
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"""
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if not self.hs.config.server.enable_search:
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return
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if isinstance(self.database_engine, PostgresEngine):
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sql = (
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"INSERT INTO event_search"
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" (event_id, room_id, key, vector, stream_ordering, origin_server_ts)"
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" VALUES (?,?,?,to_tsvector('english', ?),?,?)"
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)
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args = (
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(
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entry.event_id,
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entry.room_id,
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entry.key,
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_clean_value_for_search(entry.value),
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entry.stream_ordering,
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entry.origin_server_ts,
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)
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for entry in entries
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)
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txn.execute_batch(sql, args)
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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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args = (
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(
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entry.event_id,
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entry.room_id,
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entry.key,
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_clean_value_for_search(entry.value),
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)
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for entry in entries
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)
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txn.execute_batch(sql, args)
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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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class SearchBackgroundUpdateStore(SearchWorkerStore):
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EVENT_SEARCH_UPDATE_NAME = "event_search"
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EVENT_SEARCH_ORDER_UPDATE_NAME = "event_search_order"
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EVENT_SEARCH_USE_GIST_POSTGRES_NAME = "event_search_postgres_gist"
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EVENT_SEARCH_USE_GIN_POSTGRES_NAME = "event_search_postgres_gin"
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def __init__(
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self,
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database: DatabasePool,
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db_conn: LoggingDatabaseConnection,
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hs: "HomeServer",
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):
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super().__init__(database, db_conn, hs)
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if not hs.config.server.enable_search:
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return
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self.db_pool.updates.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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self.db_pool.updates.register_background_update_handler(
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self.EVENT_SEARCH_ORDER_UPDATE_NAME, self._background_reindex_search_order
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)
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# we used to have a background update to turn the GIN index into a
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# GIST one; we no longer do that (obviously) because we actually want
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# a GIN index. However, it's possible that some people might still have
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# the background update queued, so we register a handler to clear the
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# background update.
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self.db_pool.updates.register_noop_background_update(
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self.EVENT_SEARCH_USE_GIST_POSTGRES_NAME
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)
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self.db_pool.updates.register_background_update_handler(
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self.EVENT_SEARCH_USE_GIN_POSTGRES_NAME, self._background_reindex_gin_search
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)
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async def _background_reindex_search(self, progress, batch_size):
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# we work through the events table from highest stream id to lowest
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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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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, room_id, type, json, "
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" origin_server_ts FROM events"
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" JOIN event_json USING (room_id, event_id)"
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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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# we could stream straight from the results into
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# store_search_entries_txn with a generator function, but that
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# would mean having two cursors open on the database at once.
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# Instead we just build a list of results.
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rows = self.db_pool.cursor_to_dict(txn)
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if not rows:
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return 0
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min_stream_id = rows[-1]["stream_ordering"]
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event_search_rows = []
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for row in rows:
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try:
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event_id = row["event_id"]
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room_id = row["room_id"]
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etype = row["type"]
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stream_ordering = row["stream_ordering"]
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origin_server_ts = row["origin_server_ts"]
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try:
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event_json = db_to_json(row["json"])
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content = event_json["content"]
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except Exception:
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continue
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if etype == "m.room.message":
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key = "content.body"
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value = content["body"]
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elif etype == "m.room.topic":
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key = "content.topic"
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value = content["topic"]
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elif etype == "m.room.name":
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key = "content.name"
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value = content["name"]
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else:
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raise Exception("unexpected event type %s" % etype)
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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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if not isinstance(value, str):
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# If the event body, name or topic isn't a string
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# then skip over it
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continue
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event_search_rows.append(
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SearchEntry(
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key=key,
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value=value,
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event_id=event_id,
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room_id=room_id,
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stream_ordering=stream_ordering,
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origin_server_ts=origin_server_ts,
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)
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)
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self.store_search_entries_txn(txn, event_search_rows)
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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.db_pool.updates._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 = await self.db_pool.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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await self.db_pool.updates._end_background_update(
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self.EVENT_SEARCH_UPDATE_NAME
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)
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return result
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async def _background_reindex_gin_search(self, progress, batch_size):
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"""This handles old synapses which used GIST indexes, if any;
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converting them back to be GIN as per the actual schema.
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"""
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def create_index(conn):
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conn.rollback()
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# we have to set autocommit, because postgres refuses to
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# CREATE INDEX CONCURRENTLY without it.
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conn.set_session(autocommit=True)
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try:
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c = conn.cursor()
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# if we skipped the conversion to GIST, we may already/still
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# have an event_search_fts_idx; unfortunately postgres 9.4
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# doesn't support CREATE INDEX IF EXISTS so we just catch the
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# exception and ignore it.
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import psycopg2
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try:
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c.execute(
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"CREATE INDEX CONCURRENTLY event_search_fts_idx"
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" ON event_search USING GIN (vector)"
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)
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except psycopg2.ProgrammingError as e:
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logger.warning(
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"Ignoring error %r when trying to switch from GIST to GIN", e
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)
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# we should now be able to delete the GIST index.
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c.execute("DROP INDEX IF EXISTS event_search_fts_idx_gist")
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finally:
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conn.set_session(autocommit=False)
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if isinstance(self.database_engine, PostgresEngine):
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await self.db_pool.runWithConnection(create_index)
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await self.db_pool.updates._end_background_update(
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self.EVENT_SEARCH_USE_GIN_POSTGRES_NAME
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)
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return 1
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async def _background_reindex_search_order(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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have_added_index = progress["have_added_indexes"]
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if not have_added_index:
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def create_index(conn):
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conn.rollback()
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conn.set_session(autocommit=True)
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c = conn.cursor()
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# We create with NULLS FIRST so that when we search *backwards*
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# we get the ones with non null origin_server_ts *first*
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c.execute(
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"CREATE INDEX CONCURRENTLY event_search_room_order ON event_search("
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"room_id, origin_server_ts NULLS FIRST, stream_ordering NULLS FIRST)"
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)
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c.execute(
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"CREATE INDEX CONCURRENTLY event_search_order ON event_search("
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"origin_server_ts NULLS FIRST, stream_ordering NULLS FIRST)"
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)
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conn.set_session(autocommit=False)
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await self.db_pool.runWithConnection(create_index)
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pg = dict(progress)
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pg["have_added_indexes"] = True
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await self.db_pool.runInteraction(
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self.EVENT_SEARCH_ORDER_UPDATE_NAME,
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self.db_pool.updates._background_update_progress_txn,
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self.EVENT_SEARCH_ORDER_UPDATE_NAME,
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pg,
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)
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def reindex_search_txn(txn):
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sql = (
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"UPDATE event_search AS es SET stream_ordering = e.stream_ordering,"
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" origin_server_ts = e.origin_server_ts"
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" FROM events AS e"
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" WHERE e.event_id = es.event_id"
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" AND ? <= e.stream_ordering AND e.stream_ordering < ?"
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" RETURNING es.stream_ordering"
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)
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min_stream_id = max_stream_id - batch_size
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txn.execute(sql, (min_stream_id, max_stream_id))
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rows = txn.fetchall()
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if min_stream_id < target_min_stream_id:
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# We've recached the end.
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return len(rows), False
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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(rows),
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"have_added_indexes": True,
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}
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self.db_pool.updates._background_update_progress_txn(
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txn, self.EVENT_SEARCH_ORDER_UPDATE_NAME, progress
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)
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return len(rows), True
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num_rows, finished = await self.db_pool.runInteraction(
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self.EVENT_SEARCH_ORDER_UPDATE_NAME, reindex_search_txn
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)
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if not finished:
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await self.db_pool.updates._end_background_update(
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self.EVENT_SEARCH_ORDER_UPDATE_NAME
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)
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return num_rows
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class SearchStore(SearchBackgroundUpdateStore):
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def __init__(
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self,
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database: DatabasePool,
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db_conn: LoggingDatabaseConnection,
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hs: "HomeServer",
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):
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super().__init__(database, db_conn, hs)
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async def search_msgs(
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self, room_ids: Collection[str], search_term: str, keys: Iterable[str]
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) -> JsonDict:
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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 of room ids to search in
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search_term: Search term to search for
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keys: 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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Dictionary of results
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"""
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clauses = []
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search_query = _parse_query(self.database_engine, search_term)
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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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clause, args = make_in_list_sql_clause(
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self.database_engine, "room_id", room_ids
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)
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clauses = [clause]
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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("(%s)" % (" OR ".join(local_clauses),))
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count_args = args
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count_clauses = clauses
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if isinstance(self.database_engine, PostgresEngine):
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sql = (
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"SELECT ts_rank_cd(vector, to_tsquery('english', ?)) AS rank,"
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" room_id, event_id"
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" FROM event_search"
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" WHERE vector @@ to_tsquery('english', ?)"
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)
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args = [search_query, search_query] + args
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count_sql = (
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"SELECT room_id, count(*) as count FROM event_search"
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" WHERE vector @@ to_tsquery('english', ?)"
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)
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count_args = [search_query] + count_args
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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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args = [search_query] + args
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count_sql = (
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"SELECT room_id, count(*) as count FROM event_search"
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" WHERE value MATCH ?"
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)
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count_args = [search_term] + count_args
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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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for clause in count_clauses:
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count_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 = await self.db_pool.execute(
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"search_msgs", self.db_pool.cursor_to_dict, sql, *args
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)
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results = list(filter(lambda row: row["room_id"] in room_ids, results))
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# We set redact_behaviour to BLOCK here to prevent redacted events being returned in
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# search results (which is a data leak)
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events = await self.get_events_as_list(
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[r["event_id"] for r in results],
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redact_behaviour=EventRedactBehaviour.BLOCK,
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)
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event_map = {ev.event_id: ev for ev in events}
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highlights = None
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if isinstance(self.database_engine, PostgresEngine):
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highlights = await self._find_highlights_in_postgres(search_query, events)
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count_sql += " GROUP BY room_id"
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count_results = await self.db_pool.execute(
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"search_rooms_count", self.db_pool.cursor_to_dict, count_sql, *count_args
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)
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count = sum(row["count"] for row in count_results if row["room_id"] in room_ids)
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return {
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"results": [
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{"event": event_map[r["event_id"]], "rank": 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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"highlights": highlights,
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"count": count,
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}
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async def search_rooms(
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self,
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room_ids: Collection[str],
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search_term: str,
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keys: Iterable[str],
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limit,
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pagination_token: Optional[str] = None,
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) -> JsonDict:
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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: The room_ids to search in
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search_term: Search term to search for
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keys: List of keys to search in, currently supports "content.body",
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"content.name", "content.topic"
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pagination_token: A pagination token previously returned
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Returns:
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Each match as a dictionary.
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"""
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clauses = []
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search_query = _parse_query(self.database_engine, search_term)
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|
|
args = []
|
|
|
|
# Make sure we don't explode because the person is in too many rooms.
|
|
# We filter the results below regardless.
|
|
if len(room_ids) < 500:
|
|
clause, args = make_in_list_sql_clause(
|
|
self.database_engine, "room_id", room_ids
|
|
)
|
|
clauses = [clause]
|
|
|
|
local_clauses = []
|
|
for key in keys:
|
|
local_clauses.append("key = ?")
|
|
args.append(key)
|
|
|
|
clauses.append("(%s)" % (" OR ".join(local_clauses),))
|
|
|
|
# take copies of the current args and clauses lists, before adding
|
|
# pagination clauses to main query.
|
|
count_args = list(args)
|
|
count_clauses = list(clauses)
|
|
|
|
if pagination_token:
|
|
try:
|
|
origin_server_ts, stream = pagination_token.split(",")
|
|
origin_server_ts = int(origin_server_ts)
|
|
stream = int(stream)
|
|
except Exception:
|
|
raise SynapseError(400, "Invalid pagination token")
|
|
|
|
clauses.append(
|
|
"(origin_server_ts < ?"
|
|
" OR (origin_server_ts = ? AND stream_ordering < ?))"
|
|
)
|
|
args.extend([origin_server_ts, origin_server_ts, stream])
|
|
|
|
if isinstance(self.database_engine, PostgresEngine):
|
|
sql = (
|
|
"SELECT ts_rank_cd(vector, to_tsquery('english', ?)) as rank,"
|
|
" origin_server_ts, stream_ordering, room_id, event_id"
|
|
" FROM event_search"
|
|
" WHERE vector @@ to_tsquery('english', ?) AND "
|
|
)
|
|
args = [search_query, search_query] + args
|
|
|
|
count_sql = (
|
|
"SELECT room_id, count(*) as count FROM event_search"
|
|
" WHERE vector @@ to_tsquery('english', ?) AND "
|
|
)
|
|
count_args = [search_query] + count_args
|
|
elif isinstance(self.database_engine, Sqlite3Engine):
|
|
# We use CROSS JOIN here to ensure we use the right indexes.
|
|
# https://sqlite.org/optoverview.html#crossjoin
|
|
#
|
|
# We want to use the full text search index on event_search to
|
|
# extract all possible matches first, then lookup those matches
|
|
# in the events table to get the topological ordering. We need
|
|
# to use the indexes in this order because sqlite refuses to
|
|
# MATCH unless it uses the full text search index
|
|
sql = (
|
|
"SELECT rank(matchinfo) as rank, room_id, event_id,"
|
|
" origin_server_ts, stream_ordering"
|
|
" FROM (SELECT key, event_id, matchinfo(event_search) as matchinfo"
|
|
" FROM event_search"
|
|
" WHERE value MATCH ?"
|
|
" )"
|
|
" CROSS JOIN events USING (event_id)"
|
|
" WHERE "
|
|
)
|
|
args = [search_query] + args
|
|
|
|
count_sql = (
|
|
"SELECT room_id, count(*) as count FROM event_search"
|
|
" WHERE value MATCH ? AND "
|
|
)
|
|
count_args = [search_term] + count_args
|
|
else:
|
|
# This should be unreachable.
|
|
raise Exception("Unrecognized database engine")
|
|
|
|
sql += " AND ".join(clauses)
|
|
count_sql += " AND ".join(count_clauses)
|
|
|
|
# We add an arbitrary limit here to ensure we don't try to pull the
|
|
# entire table from the database.
|
|
if isinstance(self.database_engine, PostgresEngine):
|
|
sql += (
|
|
" ORDER BY origin_server_ts DESC NULLS LAST,"
|
|
" stream_ordering DESC NULLS LAST LIMIT ?"
|
|
)
|
|
elif isinstance(self.database_engine, Sqlite3Engine):
|
|
sql += " ORDER BY origin_server_ts DESC, stream_ordering DESC LIMIT ?"
|
|
else:
|
|
raise Exception("Unrecognized database engine")
|
|
|
|
args.append(limit)
|
|
|
|
results = await self.db_pool.execute(
|
|
"search_rooms", self.db_pool.cursor_to_dict, sql, *args
|
|
)
|
|
|
|
results = list(filter(lambda row: row["room_id"] in room_ids, results))
|
|
|
|
# We set redact_behaviour to BLOCK here to prevent redacted events being returned in
|
|
# search results (which is a data leak)
|
|
events = await self.get_events_as_list(
|
|
[r["event_id"] for r in results],
|
|
redact_behaviour=EventRedactBehaviour.BLOCK,
|
|
)
|
|
|
|
event_map = {ev.event_id: ev for ev in events}
|
|
|
|
highlights = None
|
|
if isinstance(self.database_engine, PostgresEngine):
|
|
highlights = await self._find_highlights_in_postgres(search_query, events)
|
|
|
|
count_sql += " GROUP BY room_id"
|
|
|
|
count_results = await self.db_pool.execute(
|
|
"search_rooms_count", self.db_pool.cursor_to_dict, count_sql, *count_args
|
|
)
|
|
|
|
count = sum(row["count"] for row in count_results if row["room_id"] in room_ids)
|
|
|
|
return {
|
|
"results": [
|
|
{
|
|
"event": event_map[r["event_id"]],
|
|
"rank": r["rank"],
|
|
"pagination_token": "%s,%s"
|
|
% (r["origin_server_ts"], r["stream_ordering"]),
|
|
}
|
|
for r in results
|
|
if r["event_id"] in event_map
|
|
],
|
|
"highlights": highlights,
|
|
"count": count,
|
|
}
|
|
|
|
async def _find_highlights_in_postgres(
|
|
self, search_query: str, events: List[EventBase]
|
|
) -> Set[str]:
|
|
"""Given a list of events and a search term, return a list of words
|
|
that match from the content of the event.
|
|
|
|
This is used to give a list of words that clients can match against to
|
|
highlight the matching parts.
|
|
|
|
Args:
|
|
search_query
|
|
events: A list of events
|
|
|
|
Returns:
|
|
A set of strings.
|
|
"""
|
|
|
|
def f(txn):
|
|
highlight_words = set()
|
|
for event in events:
|
|
# As a hack we simply join values of all possible keys. This is
|
|
# fine since we're only using them to find possible highlights.
|
|
values = []
|
|
for key in ("body", "name", "topic"):
|
|
v = event.content.get(key, None)
|
|
if v:
|
|
v = _clean_value_for_search(v)
|
|
values.append(v)
|
|
|
|
if not values:
|
|
continue
|
|
|
|
value = " ".join(values)
|
|
|
|
# We need to find some values for StartSel and StopSel that
|
|
# aren't in the value so that we can pick results out.
|
|
start_sel = "<"
|
|
stop_sel = ">"
|
|
|
|
while start_sel in value:
|
|
start_sel += "<"
|
|
while stop_sel in value:
|
|
stop_sel += ">"
|
|
|
|
query = "SELECT ts_headline(?, to_tsquery('english', ?), %s)" % (
|
|
_to_postgres_options(
|
|
{
|
|
"StartSel": start_sel,
|
|
"StopSel": stop_sel,
|
|
"MaxFragments": "50",
|
|
}
|
|
)
|
|
)
|
|
txn.execute(query, (value, search_query))
|
|
(headline,) = txn.fetchall()[0]
|
|
|
|
# Now we need to pick the possible highlights out of the haedline
|
|
# result.
|
|
matcher_regex = "%s(.*?)%s" % (
|
|
re.escape(start_sel),
|
|
re.escape(stop_sel),
|
|
)
|
|
|
|
res = re.findall(matcher_regex, headline)
|
|
highlight_words.update([r.lower() for r in res])
|
|
|
|
return highlight_words
|
|
|
|
return await self.db_pool.runInteraction("_find_highlights", f)
|
|
|
|
|
|
def _to_postgres_options(options_dict):
|
|
return "'%s'" % (",".join("%s=%s" % (k, v) for k, v in options_dict.items()),)
|
|
|
|
|
|
def _parse_query(database_engine, search_term):
|
|
"""Takes a plain unicode string from the user and converts it into a form
|
|
that can be passed to database.
|
|
We use this so that we can add prefix matching, which isn't something
|
|
that is supported by default.
|
|
"""
|
|
|
|
# Pull out the individual words, discarding any non-word characters.
|
|
results = re.findall(r"([\w\-]+)", search_term, re.UNICODE)
|
|
|
|
if isinstance(database_engine, PostgresEngine):
|
|
return " & ".join(result + ":*" for result in results)
|
|
elif isinstance(database_engine, Sqlite3Engine):
|
|
return " & ".join(result + "*" for result in results)
|
|
else:
|
|
# This should be unreachable.
|
|
raise Exception("Unrecognized database engine")
|