diff options
Diffstat (limited to 'synapse/storage/events.py')
| -rw-r--r-- | synapse/storage/events.py | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py index 88a6ff7310..b582942164 100644 --- a/synapse/storage/events.py +++ b/synapse/storage/events.py @@ -23,6 +23,7 @@ from synapse.util.async import ObservableDeferred from synapse.util.logcontext import preserve_fn, PreserveLoggingContext from synapse.util.logutils import log_function from synapse.api.constants import EventTypes +from synapse.api.errors import SynapseError from canonicaljson import encode_canonical_json from collections import deque, namedtuple @@ -1281,6 +1282,156 @@ class EventsStore(SQLBaseStore): ) return self.runInteraction("get_all_new_events", get_all_new_events_txn) + def delete_old_state(self, room_id, topological_ordering): + return self.runInteraction( + "delete_old_state", + self._delete_old_state_txn, room_id, topological_ordering + ) + + def _delete_old_state_txn(self, txn, room_id, topological_ordering): + """Deletes old room state + """ + + # Tables that should be pruned: + # event_auth + # event_backward_extremities + # event_content_hashes + # event_destinations + # event_edge_hashes + # event_edges + # event_forward_extremities + # event_json + # event_push_actions + # event_reference_hashes + # event_search + # event_signatures + # event_to_state_groups + # events + # rejections + # room_depth + # state_groups + # state_groups_state + + # First ensure that we're not about to delete all the forward extremeties + txn.execute( + "SELECT e.event_id, e.depth FROM events as e " + "INNER JOIN event_forward_extremities as f " + "ON e.event_id = f.event_id " + "AND e.room_id = f.room_id " + "WHERE f.room_id = ?", + (room_id,) + ) + rows = txn.fetchall() + max_depth = max(row[0] for row in rows) + + if max_depth <= topological_ordering: + # We need to ensure we don't delete all the events from the datanase + # otherwise we wouldn't be able to send any events (due to not + # having any backwards extremeties) + raise SynapseError( + 400, "topological_ordering is greater than forward extremeties" + ) + + txn.execute( + "SELECT event_id, state_key FROM events" + " LEFT JOIN state_events USING (room_id, event_id)" + " WHERE room_id = ? AND topological_ordering < ?", + (room_id, topological_ordering,) + ) + event_rows = txn.fetchall() + + # We calculate the new entries for the backward extremeties by finding + # all events that point to events that are to be purged + txn.execute( + "SELECT e.event_id FROM events as e" + " INNER JOIN event_edges as ed ON e.event_id = ed.prev_event_id" + " INNER JOIN events as e2 ON e2.event_id = ed.event_id" + " WHERE e.room_id = ? AND e.topological_ordering < ?" + " AND e2.topological_ordering >= ?", + (room_id, topological_ordering, topological_ordering) + ) + new_backwards_extrems = txn.fetchall() + + # Get all state groups that are only referenced by events that are + # to be deleted. + txn.execute( + "SELECT state_group FROM event_to_state_groups" + " INNER JOIN events USING (event_id)" + " WHERE state_group IN (" + " SELECT DISTINCT state_group FROM events" + " INNER JOIN event_to_state_groups USING (event_id)" + " WHERE room_id = ? AND topological_ordering < ?" + " )" + " GROUP BY state_group HAVING MAX(topological_ordering) < ?", + (room_id, topological_ordering, topological_ordering) + ) + state_rows = txn.fetchall() + txn.executemany( + "DELETE FROM state_groups_state WHERE state_group = ?", + state_rows + ) + txn.executemany( + "DELETE FROM state_groups WHERE id = ?", + state_rows + ) + # Delete all non-state + txn.executemany( + "DELETE FROM event_to_state_groups WHERE event_id = ?", + [(event_id,) for event_id, _ in event_rows] + ) + + txn.execute( + "UPDATE room_depth SET min_depth = ? WHERE room_id = ?", + (topological_ordering, room_id,) + ) + + # Delete all remote non-state events + to_delete = [ + (event_id,) for event_id, state_key in event_rows + if state_key is None and not self.hs.is_mine_id(event_id) + ] + for table in ( + "events", + "event_json", + "event_auth", + "event_content_hashes", + "event_destinations", + "event_edge_hashes", + "event_edges", + "event_forward_extremities", + "event_push_actions", + "event_reference_hashes", + "event_search", + "event_signatures", + "rejections", + "event_backward_extremities", + ): + txn.executemany( + "DELETE FROM %s WHERE event_id = ?" % (table,), + to_delete + ) + + # Update backward extremeties + txn.executemany( + "INSERT INTO event_backward_extremities (room_id, event_id)" + " VALUES (?, ?)", + [(room_id, event_id) for event_id, in new_backwards_extrems] + ) + + txn.executemany( + "DELETE FROM events WHERE event_id = ?", + to_delete + ) + # Mark all state and own events as outliers + txn.executemany( + "UPDATE events SET outlier = ?" + " WHERE event_id = ?", + [ + (True, event_id,) for event_id, state_key in event_rows + if state_key is not None or self.hs.is_mine_id(event_id) + ] + ) + AllNewEventsResult = namedtuple("AllNewEventsResult", [ "new_forward_events", "new_backfill_events", |