mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-12-22 15:14:57 -05:00
783 lines
28 KiB
Python
783 lines
28 KiB
Python
# Copyright 2015, 2016 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.
|
|
|
|
import logging
|
|
import re
|
|
from typing import TYPE_CHECKING, Collection, Iterable, List, Optional, Set
|
|
|
|
import attr
|
|
|
|
from synapse.api.errors import SynapseError
|
|
from synapse.events import EventBase
|
|
from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
|
|
from synapse.storage.database import (
|
|
DatabasePool,
|
|
LoggingDatabaseConnection,
|
|
LoggingTransaction,
|
|
)
|
|
from synapse.storage.databases.main.events_worker import EventRedactBehaviour
|
|
from synapse.storage.engines import PostgresEngine, Sqlite3Engine
|
|
from synapse.types import JsonDict
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.server import HomeServer
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
@attr.s(slots=True, frozen=True, auto_attribs=True)
|
|
class SearchEntry:
|
|
key: str
|
|
value: str
|
|
event_id: str
|
|
room_id: str
|
|
stream_ordering: Optional[int]
|
|
origin_server_ts: int
|
|
|
|
|
|
def _clean_value_for_search(value: str) -> str:
|
|
"""
|
|
Replaces any null code points in the string with spaces as
|
|
Postgres and SQLite do not like the insertion of strings with
|
|
null code points into the full-text search tables.
|
|
"""
|
|
return value.replace("\u0000", " ")
|
|
|
|
|
|
class SearchWorkerStore(SQLBaseStore):
|
|
def store_search_entries_txn(
|
|
self, txn: LoggingTransaction, entries: Iterable[SearchEntry]
|
|
) -> None:
|
|
"""Add entries to the search table
|
|
|
|
Args:
|
|
txn:
|
|
entries: entries to be added to the table
|
|
"""
|
|
if not self.hs.config.server.enable_search:
|
|
return
|
|
if isinstance(self.database_engine, PostgresEngine):
|
|
sql = (
|
|
"INSERT INTO event_search"
|
|
" (event_id, room_id, key, vector, stream_ordering, origin_server_ts)"
|
|
" VALUES (?,?,?,to_tsvector('english', ?),?,?)"
|
|
)
|
|
|
|
args = (
|
|
(
|
|
entry.event_id,
|
|
entry.room_id,
|
|
entry.key,
|
|
_clean_value_for_search(entry.value),
|
|
entry.stream_ordering,
|
|
entry.origin_server_ts,
|
|
)
|
|
for entry in entries
|
|
)
|
|
|
|
txn.execute_batch(sql, args)
|
|
|
|
elif isinstance(self.database_engine, Sqlite3Engine):
|
|
sql = (
|
|
"INSERT INTO event_search (event_id, room_id, key, value)"
|
|
" VALUES (?,?,?,?)"
|
|
)
|
|
args = (
|
|
(
|
|
entry.event_id,
|
|
entry.room_id,
|
|
entry.key,
|
|
_clean_value_for_search(entry.value),
|
|
)
|
|
for entry in entries
|
|
)
|
|
txn.execute_batch(sql, args)
|
|
|
|
else:
|
|
# This should be unreachable.
|
|
raise Exception("Unrecognized database engine")
|
|
|
|
|
|
class SearchBackgroundUpdateStore(SearchWorkerStore):
|
|
|
|
EVENT_SEARCH_UPDATE_NAME = "event_search"
|
|
EVENT_SEARCH_ORDER_UPDATE_NAME = "event_search_order"
|
|
EVENT_SEARCH_USE_GIST_POSTGRES_NAME = "event_search_postgres_gist"
|
|
EVENT_SEARCH_USE_GIN_POSTGRES_NAME = "event_search_postgres_gin"
|
|
EVENT_SEARCH_DELETE_NON_STRINGS = "event_search_sqlite_delete_non_strings"
|
|
|
|
def __init__(
|
|
self,
|
|
database: DatabasePool,
|
|
db_conn: LoggingDatabaseConnection,
|
|
hs: "HomeServer",
|
|
):
|
|
super().__init__(database, db_conn, hs)
|
|
|
|
self.db_pool.updates.register_background_update_handler(
|
|
self.EVENT_SEARCH_UPDATE_NAME, self._background_reindex_search
|
|
)
|
|
self.db_pool.updates.register_background_update_handler(
|
|
self.EVENT_SEARCH_ORDER_UPDATE_NAME, self._background_reindex_search_order
|
|
)
|
|
|
|
# we used to have a background update to turn the GIN index into a
|
|
# GIST one; we no longer do that (obviously) because we actually want
|
|
# a GIN index. However, it's possible that some people might still have
|
|
# the background update queued, so we register a handler to clear the
|
|
# background update.
|
|
self.db_pool.updates.register_noop_background_update(
|
|
self.EVENT_SEARCH_USE_GIST_POSTGRES_NAME
|
|
)
|
|
|
|
self.db_pool.updates.register_background_update_handler(
|
|
self.EVENT_SEARCH_USE_GIN_POSTGRES_NAME, self._background_reindex_gin_search
|
|
)
|
|
|
|
self.db_pool.updates.register_background_update_handler(
|
|
self.EVENT_SEARCH_DELETE_NON_STRINGS, self._background_delete_non_strings
|
|
)
|
|
|
|
async def _background_reindex_search(self, progress, batch_size):
|
|
# we work through the events table from highest stream id to lowest
|
|
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)
|
|
|
|
TYPES = ["m.room.name", "m.room.message", "m.room.topic"]
|
|
|
|
def reindex_search_txn(txn):
|
|
sql = (
|
|
"SELECT stream_ordering, event_id, room_id, type, json, "
|
|
" origin_server_ts FROM events"
|
|
" JOIN event_json USING (room_id, event_id)"
|
|
" WHERE ? <= stream_ordering AND stream_ordering < ?"
|
|
" AND (%s)"
|
|
" ORDER BY stream_ordering DESC"
|
|
" LIMIT ?"
|
|
) % (" OR ".join("type = '%s'" % (t,) for t in TYPES),)
|
|
|
|
txn.execute(sql, (target_min_stream_id, max_stream_id, batch_size))
|
|
|
|
# we could stream straight from the results into
|
|
# store_search_entries_txn with a generator function, but that
|
|
# would mean having two cursors open on the database at once.
|
|
# Instead we just build a list of results.
|
|
rows = self.db_pool.cursor_to_dict(txn)
|
|
if not rows:
|
|
return 0
|
|
|
|
min_stream_id = rows[-1]["stream_ordering"]
|
|
|
|
event_search_rows = []
|
|
for row in rows:
|
|
try:
|
|
event_id = row["event_id"]
|
|
room_id = row["room_id"]
|
|
etype = row["type"]
|
|
stream_ordering = row["stream_ordering"]
|
|
origin_server_ts = row["origin_server_ts"]
|
|
try:
|
|
event_json = db_to_json(row["json"])
|
|
content = event_json["content"]
|
|
except Exception:
|
|
continue
|
|
|
|
if etype == "m.room.message":
|
|
key = "content.body"
|
|
value = content["body"]
|
|
elif etype == "m.room.topic":
|
|
key = "content.topic"
|
|
value = content["topic"]
|
|
elif etype == "m.room.name":
|
|
key = "content.name"
|
|
value = content["name"]
|
|
else:
|
|
raise Exception("unexpected event type %s" % etype)
|
|
except (KeyError, AttributeError):
|
|
# If the event is missing a necessary field then
|
|
# skip over it.
|
|
continue
|
|
|
|
if not isinstance(value, str):
|
|
# If the event body, name or topic isn't a string
|
|
# then skip over it
|
|
continue
|
|
|
|
event_search_rows.append(
|
|
SearchEntry(
|
|
key=key,
|
|
value=value,
|
|
event_id=event_id,
|
|
room_id=room_id,
|
|
stream_ordering=stream_ordering,
|
|
origin_server_ts=origin_server_ts,
|
|
)
|
|
)
|
|
|
|
self.store_search_entries_txn(txn, event_search_rows)
|
|
|
|
progress = {
|
|
"target_min_stream_id_inclusive": target_min_stream_id,
|
|
"max_stream_id_exclusive": min_stream_id,
|
|
"rows_inserted": rows_inserted + len(event_search_rows),
|
|
}
|
|
|
|
self.db_pool.updates._background_update_progress_txn(
|
|
txn, self.EVENT_SEARCH_UPDATE_NAME, progress
|
|
)
|
|
|
|
return len(event_search_rows)
|
|
|
|
if self.hs.config.server.enable_search:
|
|
result = await self.db_pool.runInteraction(
|
|
self.EVENT_SEARCH_UPDATE_NAME, reindex_search_txn
|
|
)
|
|
else:
|
|
# Don't index anything if search is not enabled.
|
|
result = 0
|
|
|
|
if not result:
|
|
await self.db_pool.updates._end_background_update(
|
|
self.EVENT_SEARCH_UPDATE_NAME
|
|
)
|
|
|
|
return result
|
|
|
|
async def _background_reindex_gin_search(self, progress, batch_size):
|
|
"""This handles old synapses which used GIST indexes, if any;
|
|
converting them back to be GIN as per the actual schema.
|
|
"""
|
|
|
|
def create_index(conn):
|
|
conn.rollback()
|
|
|
|
# we have to set autocommit, because postgres refuses to
|
|
# CREATE INDEX CONCURRENTLY without it.
|
|
conn.set_session(autocommit=True)
|
|
|
|
try:
|
|
c = conn.cursor()
|
|
|
|
# if we skipped the conversion to GIST, we may already/still
|
|
# have an event_search_fts_idx; unfortunately postgres 9.4
|
|
# doesn't support CREATE INDEX IF EXISTS so we just catch the
|
|
# exception and ignore it.
|
|
import psycopg2
|
|
|
|
try:
|
|
c.execute(
|
|
"CREATE INDEX CONCURRENTLY event_search_fts_idx"
|
|
" ON event_search USING GIN (vector)"
|
|
)
|
|
except psycopg2.ProgrammingError as e:
|
|
logger.warning(
|
|
"Ignoring error %r when trying to switch from GIST to GIN", e
|
|
)
|
|
|
|
# we should now be able to delete the GIST index.
|
|
c.execute("DROP INDEX IF EXISTS event_search_fts_idx_gist")
|
|
finally:
|
|
conn.set_session(autocommit=False)
|
|
|
|
if isinstance(self.database_engine, PostgresEngine):
|
|
await self.db_pool.runWithConnection(create_index)
|
|
|
|
await self.db_pool.updates._end_background_update(
|
|
self.EVENT_SEARCH_USE_GIN_POSTGRES_NAME
|
|
)
|
|
return 1
|
|
|
|
async def _background_reindex_search_order(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)
|
|
have_added_index = progress["have_added_indexes"]
|
|
|
|
if not have_added_index:
|
|
|
|
def create_index(conn):
|
|
conn.rollback()
|
|
conn.set_session(autocommit=True)
|
|
c = conn.cursor()
|
|
|
|
# We create with NULLS FIRST so that when we search *backwards*
|
|
# we get the ones with non null origin_server_ts *first*
|
|
c.execute(
|
|
"CREATE INDEX CONCURRENTLY event_search_room_order ON event_search("
|
|
"room_id, origin_server_ts NULLS FIRST, stream_ordering NULLS FIRST)"
|
|
)
|
|
c.execute(
|
|
"CREATE INDEX CONCURRENTLY event_search_order ON event_search("
|
|
"origin_server_ts NULLS FIRST, stream_ordering NULLS FIRST)"
|
|
)
|
|
conn.set_session(autocommit=False)
|
|
|
|
await self.db_pool.runWithConnection(create_index)
|
|
|
|
pg = dict(progress)
|
|
pg["have_added_indexes"] = True
|
|
|
|
await self.db_pool.runInteraction(
|
|
self.EVENT_SEARCH_ORDER_UPDATE_NAME,
|
|
self.db_pool.updates._background_update_progress_txn,
|
|
self.EVENT_SEARCH_ORDER_UPDATE_NAME,
|
|
pg,
|
|
)
|
|
|
|
def reindex_search_txn(txn):
|
|
sql = (
|
|
"UPDATE event_search AS es SET stream_ordering = e.stream_ordering,"
|
|
" origin_server_ts = e.origin_server_ts"
|
|
" FROM events AS e"
|
|
" WHERE e.event_id = es.event_id"
|
|
" AND ? <= e.stream_ordering AND e.stream_ordering < ?"
|
|
" RETURNING es.stream_ordering"
|
|
)
|
|
|
|
min_stream_id = max_stream_id - batch_size
|
|
txn.execute(sql, (min_stream_id, max_stream_id))
|
|
rows = txn.fetchall()
|
|
|
|
if min_stream_id < target_min_stream_id:
|
|
# We've recached the end.
|
|
return len(rows), False
|
|
|
|
progress = {
|
|
"target_min_stream_id_inclusive": target_min_stream_id,
|
|
"max_stream_id_exclusive": min_stream_id,
|
|
"rows_inserted": rows_inserted + len(rows),
|
|
"have_added_indexes": True,
|
|
}
|
|
|
|
self.db_pool.updates._background_update_progress_txn(
|
|
txn, self.EVENT_SEARCH_ORDER_UPDATE_NAME, progress
|
|
)
|
|
|
|
return len(rows), True
|
|
|
|
num_rows, finished = await self.db_pool.runInteraction(
|
|
self.EVENT_SEARCH_ORDER_UPDATE_NAME, reindex_search_txn
|
|
)
|
|
|
|
if not finished:
|
|
await self.db_pool.updates._end_background_update(
|
|
self.EVENT_SEARCH_ORDER_UPDATE_NAME
|
|
)
|
|
|
|
return num_rows
|
|
|
|
async def _background_delete_non_strings(
|
|
self, progress: JsonDict, batch_size: int
|
|
) -> int:
|
|
"""Deletes rows with non-string `value`s from `event_search` if using sqlite.
|
|
|
|
Prior to Synapse 1.44.0, malformed events received over federation could cause integers
|
|
to be inserted into the `event_search` table when using sqlite.
|
|
"""
|
|
|
|
def delete_non_strings_txn(txn: LoggingTransaction) -> None:
|
|
txn.execute("DELETE FROM event_search WHERE typeof(value) != 'text'")
|
|
|
|
await self.db_pool.runInteraction(
|
|
self.EVENT_SEARCH_DELETE_NON_STRINGS, delete_non_strings_txn
|
|
)
|
|
|
|
await self.db_pool.updates._end_background_update(
|
|
self.EVENT_SEARCH_DELETE_NON_STRINGS
|
|
)
|
|
return 1
|
|
|
|
|
|
class SearchStore(SearchBackgroundUpdateStore):
|
|
def __init__(
|
|
self,
|
|
database: DatabasePool,
|
|
db_conn: LoggingDatabaseConnection,
|
|
hs: "HomeServer",
|
|
):
|
|
super().__init__(database, db_conn, hs)
|
|
|
|
async def search_msgs(
|
|
self, room_ids: Collection[str], search_term: str, keys: Iterable[str]
|
|
) -> JsonDict:
|
|
"""Performs a full text search over events with given keys.
|
|
|
|
Args:
|
|
room_ids: List of room ids to search in
|
|
search_term: Search term to search for
|
|
keys: List of keys to search in, currently supports
|
|
"content.body", "content.name", "content.topic"
|
|
|
|
Returns:
|
|
Dictionary of results
|
|
"""
|
|
clauses = []
|
|
|
|
search_query = _parse_query(self.database_engine, search_term)
|
|
|
|
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),))
|
|
|
|
count_args = args
|
|
count_clauses = clauses
|
|
|
|
if isinstance(self.database_engine, PostgresEngine):
|
|
sql = (
|
|
"SELECT ts_rank_cd(vector, to_tsquery('english', ?)) AS rank,"
|
|
" room_id, event_id"
|
|
" FROM event_search"
|
|
" WHERE vector @@ to_tsquery('english', ?)"
|
|
)
|
|
args = [search_query, search_query] + args
|
|
|
|
count_sql = (
|
|
"SELECT room_id, count(*) as count FROM event_search"
|
|
" WHERE vector @@ to_tsquery('english', ?)"
|
|
)
|
|
count_args = [search_query] + count_args
|
|
elif isinstance(self.database_engine, Sqlite3Engine):
|
|
sql = (
|
|
"SELECT rank(matchinfo(event_search)) as rank, room_id, event_id"
|
|
" FROM event_search"
|
|
" WHERE value MATCH ?"
|
|
)
|
|
args = [search_query] + args
|
|
|
|
count_sql = (
|
|
"SELECT room_id, count(*) as count FROM event_search"
|
|
" WHERE value MATCH ?"
|
|
)
|
|
count_args = [search_term] + count_args
|
|
else:
|
|
# This should be unreachable.
|
|
raise Exception("Unrecognized database engine")
|
|
|
|
for clause in clauses:
|
|
sql += " AND " + clause
|
|
|
|
for clause in count_clauses:
|
|
count_sql += " AND " + clause
|
|
|
|
# We add an arbitrary limit here to ensure we don't try to pull the
|
|
# entire table from the database.
|
|
sql += " ORDER BY rank DESC LIMIT 500"
|
|
|
|
results = await self.db_pool.execute(
|
|
"search_msgs", 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"]}
|
|
for r in results
|
|
if r["event_id"] in event_map
|
|
],
|
|
"highlights": highlights,
|
|
"count": count,
|
|
}
|
|
|
|
async def search_rooms(
|
|
self,
|
|
room_ids: Collection[str],
|
|
search_term: str,
|
|
keys: Iterable[str],
|
|
limit,
|
|
pagination_token: Optional[str] = None,
|
|
) -> JsonDict:
|
|
"""Performs a full text search over events with given keys.
|
|
|
|
Args:
|
|
room_ids: The room_ids to search in
|
|
search_term: Search term to search for
|
|
keys: List of keys to search in, currently supports "content.body",
|
|
"content.name", "content.topic"
|
|
pagination_token: A pagination token previously returned
|
|
|
|
Returns:
|
|
Each match as a dictionary.
|
|
"""
|
|
clauses = []
|
|
|
|
search_query = _parse_query(self.database_engine, search_term)
|
|
|
|
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")
|