forked-synapse/synapse/storage/events_bg_updates.py
2019-10-09 16:03:24 +01:00

504 lines
18 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# 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
from six import text_type
from canonicaljson import json
from twisted.internet import defer
from synapse.storage.background_updates import BackgroundUpdateStore
logger = logging.getLogger(__name__)
class EventsBackgroundUpdatesStore(BackgroundUpdateStore):
EVENT_ORIGIN_SERVER_TS_NAME = "event_origin_server_ts"
EVENT_FIELDS_SENDER_URL_UPDATE_NAME = "event_fields_sender_url"
DELETE_SOFT_FAILED_EXTREMITIES = "delete_soft_failed_extremities"
def __init__(self, db_conn, hs):
super(EventsBackgroundUpdatesStore, self).__init__(db_conn, hs)
self.register_background_update_handler(
self.EVENT_ORIGIN_SERVER_TS_NAME, self._background_reindex_origin_server_ts
)
self.register_background_update_handler(
self.EVENT_FIELDS_SENDER_URL_UPDATE_NAME,
self._background_reindex_fields_sender,
)
self.register_background_index_update(
"event_contains_url_index",
index_name="event_contains_url_index",
table="events",
columns=["room_id", "topological_ordering", "stream_ordering"],
where_clause="contains_url = true AND outlier = false",
)
# an event_id index on event_search is useful for the purge_history
# api. Plus it means we get to enforce some integrity with a UNIQUE
# clause
self.register_background_index_update(
"event_search_event_id_idx",
index_name="event_search_event_id_idx",
table="event_search",
columns=["event_id"],
unique=True,
psql_only=True,
)
self.register_background_update_handler(
self.DELETE_SOFT_FAILED_EXTREMITIES, self._cleanup_extremities_bg_update
)
self.register_background_update_handler(
"redactions_received_ts", self._redactions_received_ts
)
# This index gets deleted in `event_fix_redactions_bytes` update
self.register_background_index_update(
"event_fix_redactions_bytes_create_index",
index_name="redactions_censored_redacts",
table="redactions",
columns=["redacts"],
where_clause="have_censored",
)
self.register_background_update_handler(
"event_fix_redactions_bytes", self._event_fix_redactions_bytes
)
@defer.inlineCallbacks
def _background_reindex_fields_sender(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)
INSERT_CLUMP_SIZE = 1000
def reindex_txn(txn):
sql = (
"SELECT stream_ordering, event_id, json FROM events"
" INNER JOIN event_json USING (event_id)"
" WHERE ? <= stream_ordering AND stream_ordering < ?"
" ORDER BY stream_ordering DESC"
" LIMIT ?"
)
txn.execute(sql, (target_min_stream_id, max_stream_id, batch_size))
rows = txn.fetchall()
if not rows:
return 0
min_stream_id = rows[-1][0]
update_rows = []
for row in rows:
try:
event_id = row[1]
event_json = json.loads(row[2])
sender = event_json["sender"]
content = event_json["content"]
contains_url = "url" in content
if contains_url:
contains_url &= isinstance(content["url"], text_type)
except (KeyError, AttributeError):
# If the event is missing a necessary field then
# skip over it.
continue
update_rows.append((sender, contains_url, event_id))
sql = "UPDATE events SET sender = ?, contains_url = ? WHERE event_id = ?"
for index in range(0, len(update_rows), INSERT_CLUMP_SIZE):
clump = update_rows[index : index + INSERT_CLUMP_SIZE]
txn.executemany(sql, clump)
progress = {
"target_min_stream_id_inclusive": target_min_stream_id,
"max_stream_id_exclusive": min_stream_id,
"rows_inserted": rows_inserted + len(rows),
}
self._background_update_progress_txn(
txn, self.EVENT_FIELDS_SENDER_URL_UPDATE_NAME, progress
)
return len(rows)
result = yield self.runInteraction(
self.EVENT_FIELDS_SENDER_URL_UPDATE_NAME, reindex_txn
)
if not result:
yield self._end_background_update(self.EVENT_FIELDS_SENDER_URL_UPDATE_NAME)
return result
@defer.inlineCallbacks
def _background_reindex_origin_server_ts(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)
INSERT_CLUMP_SIZE = 1000
def reindex_search_txn(txn):
sql = (
"SELECT stream_ordering, event_id FROM events"
" WHERE ? <= stream_ordering AND stream_ordering < ?"
" ORDER BY stream_ordering DESC"
" LIMIT ?"
)
txn.execute(sql, (target_min_stream_id, max_stream_id, batch_size))
rows = txn.fetchall()
if not rows:
return 0
min_stream_id = rows[-1][0]
event_ids = [row[1] for row in rows]
rows_to_update = []
chunks = [event_ids[i : i + 100] for i in range(0, len(event_ids), 100)]
for chunk in chunks:
ev_rows = self._simple_select_many_txn(
txn,
table="event_json",
column="event_id",
iterable=chunk,
retcols=["event_id", "json"],
keyvalues={},
)
for row in ev_rows:
event_id = row["event_id"]
event_json = json.loads(row["json"])
try:
origin_server_ts = event_json["origin_server_ts"]
except (KeyError, AttributeError):
# If the event is missing a necessary field then
# skip over it.
continue
rows_to_update.append((origin_server_ts, event_id))
sql = "UPDATE events SET origin_server_ts = ? WHERE event_id = ?"
for index in range(0, len(rows_to_update), INSERT_CLUMP_SIZE):
clump = rows_to_update[index : index + INSERT_CLUMP_SIZE]
txn.executemany(sql, clump)
progress = {
"target_min_stream_id_inclusive": target_min_stream_id,
"max_stream_id_exclusive": min_stream_id,
"rows_inserted": rows_inserted + len(rows_to_update),
}
self._background_update_progress_txn(
txn, self.EVENT_ORIGIN_SERVER_TS_NAME, progress
)
return len(rows_to_update)
result = yield self.runInteraction(
self.EVENT_ORIGIN_SERVER_TS_NAME, reindex_search_txn
)
if not result:
yield self._end_background_update(self.EVENT_ORIGIN_SERVER_TS_NAME)
return result
@defer.inlineCallbacks
def _cleanup_extremities_bg_update(self, progress, batch_size):
"""Background update to clean out extremities that should have been
deleted previously.
Mainly used to deal with the aftermath of #5269.
"""
# This works by first copying all existing forward extremities into the
# `_extremities_to_check` table at start up, and then checking each
# event in that table whether we have any descendants that are not
# soft-failed/rejected. If that is the case then we delete that event
# from the forward extremities table.
#
# For efficiency, we do this in batches by recursively pulling out all
# descendants of a batch until we find the non soft-failed/rejected
# events, i.e. the set of descendants whose chain of prev events back
# to the batch of extremities are all soft-failed or rejected.
# Typically, we won't find any such events as extremities will rarely
# have any descendants, but if they do then we should delete those
# extremities.
def _cleanup_extremities_bg_update_txn(txn):
# The set of extremity event IDs that we're checking this round
original_set = set()
# A dict[str, set[str]] of event ID to their prev events.
graph = {}
# The set of descendants of the original set that are not rejected
# nor soft-failed. Ancestors of these events should be removed
# from the forward extremities table.
non_rejected_leaves = set()
# Set of event IDs that have been soft failed, and for which we
# should check if they have descendants which haven't been soft
# failed.
soft_failed_events_to_lookup = set()
# First, we get `batch_size` events from the table, pulling out
# their successor events, if any, and the successor events'
# rejection status.
txn.execute(
"""SELECT prev_event_id, event_id, internal_metadata,
rejections.event_id IS NOT NULL, events.outlier
FROM (
SELECT event_id AS prev_event_id
FROM _extremities_to_check
LIMIT ?
) AS f
LEFT JOIN event_edges USING (prev_event_id)
LEFT JOIN events USING (event_id)
LEFT JOIN event_json USING (event_id)
LEFT JOIN rejections USING (event_id)
""",
(batch_size,),
)
for prev_event_id, event_id, metadata, rejected, outlier in txn:
original_set.add(prev_event_id)
if not event_id or outlier:
# Common case where the forward extremity doesn't have any
# descendants.
continue
graph.setdefault(event_id, set()).add(prev_event_id)
soft_failed = False
if metadata:
soft_failed = json.loads(metadata).get("soft_failed")
if soft_failed or rejected:
soft_failed_events_to_lookup.add(event_id)
else:
non_rejected_leaves.add(event_id)
# Now we recursively check all the soft-failed descendants we
# found above in the same way, until we have nothing left to
# check.
while soft_failed_events_to_lookup:
# We only want to do 100 at a time, so we split given list
# into two.
batch = list(soft_failed_events_to_lookup)
to_check, to_defer = batch[:100], batch[100:]
soft_failed_events_to_lookup = set(to_defer)
sql = """SELECT prev_event_id, event_id, internal_metadata,
rejections.event_id IS NOT NULL
FROM event_edges
INNER JOIN events USING (event_id)
INNER JOIN event_json USING (event_id)
LEFT JOIN rejections USING (event_id)
WHERE
prev_event_id IN (%s)
AND NOT events.outlier
""" % (
",".join("?" for _ in to_check),
)
txn.execute(sql, to_check)
for prev_event_id, event_id, metadata, rejected in txn:
if event_id in graph:
# Already handled this event previously, but we still
# want to record the edge.
graph[event_id].add(prev_event_id)
continue
graph[event_id] = {prev_event_id}
soft_failed = json.loads(metadata).get("soft_failed")
if soft_failed or rejected:
soft_failed_events_to_lookup.add(event_id)
else:
non_rejected_leaves.add(event_id)
# We have a set of non-soft-failed descendants, so we recurse up
# the graph to find all ancestors and add them to the set of event
# IDs that we can delete from forward extremities table.
to_delete = set()
while non_rejected_leaves:
event_id = non_rejected_leaves.pop()
prev_event_ids = graph.get(event_id, set())
non_rejected_leaves.update(prev_event_ids)
to_delete.update(prev_event_ids)
to_delete.intersection_update(original_set)
deleted = self._simple_delete_many_txn(
txn=txn,
table="event_forward_extremities",
column="event_id",
iterable=to_delete,
keyvalues={},
)
logger.info(
"Deleted %d forward extremities of %d checked, to clean up #5269",
deleted,
len(original_set),
)
if deleted:
# We now need to invalidate the caches of these rooms
rows = self._simple_select_many_txn(
txn,
table="events",
column="event_id",
iterable=to_delete,
keyvalues={},
retcols=("room_id",),
)
room_ids = set(row["room_id"] for row in rows)
for room_id in room_ids:
txn.call_after(
self.get_latest_event_ids_in_room.invalidate, (room_id,)
)
self._simple_delete_many_txn(
txn=txn,
table="_extremities_to_check",
column="event_id",
iterable=original_set,
keyvalues={},
)
return len(original_set)
num_handled = yield self.runInteraction(
"_cleanup_extremities_bg_update", _cleanup_extremities_bg_update_txn
)
if not num_handled:
yield self._end_background_update(self.DELETE_SOFT_FAILED_EXTREMITIES)
def _drop_table_txn(txn):
txn.execute("DROP TABLE _extremities_to_check")
yield self.runInteraction(
"_cleanup_extremities_bg_update_drop_table", _drop_table_txn
)
return num_handled
@defer.inlineCallbacks
def _redactions_received_ts(self, progress, batch_size):
"""Handles filling out the `received_ts` column in redactions.
"""
last_event_id = progress.get("last_event_id", "")
def _redactions_received_ts_txn(txn):
# Fetch the set of event IDs that we want to update
sql = """
SELECT event_id FROM redactions
WHERE event_id > ?
ORDER BY event_id ASC
LIMIT ?
"""
txn.execute(sql, (last_event_id, batch_size))
rows = txn.fetchall()
if not rows:
return 0
upper_event_id, = rows[-1]
# Update the redactions with the received_ts.
#
# Note: Not all events have an associated received_ts, so we
# fallback to using origin_server_ts. If we for some reason don't
# have an origin_server_ts, lets just use the current timestamp.
#
# We don't want to leave it null, as then we'll never try and
# censor those redactions.
sql = """
UPDATE redactions
SET received_ts = (
SELECT COALESCE(received_ts, origin_server_ts, ?) FROM events
WHERE events.event_id = redactions.event_id
)
WHERE ? <= event_id AND event_id <= ?
"""
txn.execute(sql, (self._clock.time_msec(), last_event_id, upper_event_id))
self._background_update_progress_txn(
txn, "redactions_received_ts", {"last_event_id": upper_event_id}
)
return len(rows)
count = yield self.runInteraction(
"_redactions_received_ts", _redactions_received_ts_txn
)
if not count:
yield self._end_background_update("redactions_received_ts")
return count
@defer.inlineCallbacks
def _event_fix_redactions_bytes(self, progress, batch_size):
"""Undoes hex encoded censored redacted event JSON.
"""
def _event_fix_redactions_bytes_txn(txn):
# This update is quite fast due to new index.
txn.execute(
"""
UPDATE event_json
SET
json = convert_from(json::bytea, 'utf8')
FROM redactions
WHERE
redactions.have_censored
AND event_json.event_id = redactions.redacts
AND json NOT LIKE '{%';
"""
)
txn.execute("DROP INDEX redactions_censored_redacts")
yield self.runInteraction(
"_event_fix_redactions_bytes", _event_fix_redactions_bytes_txn
)
yield self._end_background_update("event_fix_redactions_bytes")
return 1