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Add storage function to purge history for a room

This commit is contained in:
Erik Johnston 2016-07-04 16:02:50 +01:00
parent 3de8168343
commit a67bf0b074

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@ -1281,6 +1281,146 @@ class EventsStore(SQLBaseStore):
)
return self.runInteraction("get_all_new_events", get_all_new_events_txn)
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:
raise Exception("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)
]
to_not_delete = [
(event_id,) for event_id, state_key in event_rows
if state_key is not None or 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 = ?",
to_not_delete
)
AllNewEventsResult = namedtuple("AllNewEventsResult", [
"new_forward_events", "new_backfill_events",