diff --git a/synapse/storage/data_stores/main/events.py b/synapse/storage/data_stores/main/events.py
index 2737a1d3ae..79c91fe284 100644
--- a/synapse/storage/data_stores/main/events.py
+++ b/synapse/storage/data_stores/main/events.py
@@ -130,6 +130,8 @@ class EventsStore(
if self.hs.config.redaction_retention_period is not None:
hs.get_clock().looping_call(_censor_redactions, 5 * 60 * 1000)
+ self._ephemeral_messages_enabled = hs.config.enable_ephemeral_messages
+
@defer.inlineCallbacks
def _read_forward_extremities(self):
def fetch(txn):
@@ -940,6 +942,12 @@ class EventsStore(
txn, event.event_id, labels, event.room_id, event.depth
)
+ if self._ephemeral_messages_enabled:
+ # If there's an expiry timestamp on the event, store it.
+ expiry_ts = event.content.get(EventContentFields.SELF_DESTRUCT_AFTER)
+ if isinstance(expiry_ts, int) and not event.is_state():
+ self._insert_event_expiry_txn(txn, event.event_id, expiry_ts)
+
# Insert into the room_memberships table.
self._store_room_members_txn(
txn,
@@ -1101,12 +1109,7 @@ class EventsStore(
def _update_censor_txn(txn):
for redaction_id, event_id, pruned_json in updates:
if pruned_json:
- self._simple_update_one_txn(
- txn,
- table="event_json",
- keyvalues={"event_id": event_id},
- updatevalues={"json": pruned_json},
- )
+ self._censor_event_txn(txn, event_id, pruned_json)
self._simple_update_one_txn(
txn,
@@ -1117,6 +1120,22 @@ class EventsStore(
yield self.runInteraction("_update_censor_txn", _update_censor_txn)
+ def _censor_event_txn(self, txn, event_id, pruned_json):
+ """Censor an event by replacing its JSON in the event_json table with the
+ provided pruned JSON.
+
+ Args:
+ txn (LoggingTransaction): The database transaction.
+ event_id (str): The ID of the event to censor.
+ pruned_json (str): The pruned JSON
+ """
+ self._simple_update_one_txn(
+ txn,
+ table="event_json",
+ keyvalues={"event_id": event_id},
+ updatevalues={"json": pruned_json},
+ )
+
@defer.inlineCallbacks
def count_daily_messages(self):
"""
@@ -1957,6 +1976,101 @@ class EventsStore(
],
)
+ def _insert_event_expiry_txn(self, txn, event_id, expiry_ts):
+ """Save the expiry timestamp associated with a given event ID.
+
+ Args:
+ txn (LoggingTransaction): The database transaction to use.
+ event_id (str): The event ID the expiry timestamp is associated with.
+ expiry_ts (int): The timestamp at which to expire (delete) the event.
+ """
+ return self._simple_insert_txn(
+ txn=txn,
+ table="event_expiry",
+ values={"event_id": event_id, "expiry_ts": expiry_ts},
+ )
+
+ @defer.inlineCallbacks
+ def expire_event(self, event_id):
+ """Retrieve and expire an event that has expired, and delete its associated
+ expiry timestamp. If the event can't be retrieved, delete its associated
+ timestamp so we don't try to expire it again in the future.
+
+ Args:
+ event_id (str): The ID of the event to delete.
+ """
+ # Try to retrieve the event's content from the database or the event cache.
+ event = yield self.get_event(event_id)
+
+ def delete_expired_event_txn(txn):
+ # Delete the expiry timestamp associated with this event from the database.
+ self._delete_event_expiry_txn(txn, event_id)
+
+ if not event:
+ # If we can't find the event, log a warning and delete the expiry date
+ # from the database so that we don't try to expire it again in the
+ # future.
+ logger.warning(
+ "Can't expire event %s because we don't have it.", event_id
+ )
+ return
+
+ # Prune the event's dict then convert it to JSON.
+ pruned_json = encode_json(prune_event_dict(event.get_dict()))
+
+ # Update the event_json table to replace the event's JSON with the pruned
+ # JSON.
+ self._censor_event_txn(txn, event.event_id, pruned_json)
+
+ # We need to invalidate the event cache entry for this event because we
+ # changed its content in the database. We can't call
+ # self._invalidate_cache_and_stream because self.get_event_cache isn't of the
+ # right type.
+ txn.call_after(self._get_event_cache.invalidate, (event.event_id,))
+ # Send that invalidation to replication so that other workers also invalidate
+ # the event cache.
+ self._send_invalidation_to_replication(
+ txn, "_get_event_cache", (event.event_id,)
+ )
+
+ yield self.runInteraction("delete_expired_event", delete_expired_event_txn)
+
+ def _delete_event_expiry_txn(self, txn, event_id):
+ """Delete the expiry timestamp associated with an event ID without deleting the
+ actual event.
+
+ Args:
+ txn (LoggingTransaction): The transaction to use to perform the deletion.
+ event_id (str): The event ID to delete the associated expiry timestamp of.
+ """
+ return self._simple_delete_txn(
+ txn=txn, table="event_expiry", keyvalues={"event_id": event_id}
+ )
+
+ def get_next_event_to_expire(self):
+ """Retrieve the entry with the lowest expiry timestamp in the event_expiry
+ table, or None if there's no more event to expire.
+
+ Returns: Deferred[Optional[Tuple[str, int]]]
+ A tuple containing the event ID as its first element and an expiry timestamp
+ as its second one, if there's at least one row in the event_expiry table.
+ None otherwise.
+ """
+
+ def get_next_event_to_expire_txn(txn):
+ txn.execute(
+ """
+ SELECT event_id, expiry_ts FROM event_expiry
+ ORDER BY expiry_ts ASC LIMIT 1
+ """
+ )
+
+ return txn.fetchone()
+
+ return self.runInteraction(
+ desc="get_next_event_to_expire", func=get_next_event_to_expire_txn
+ )
+
AllNewEventsResult = namedtuple(
"AllNewEventsResult",
diff --git a/synapse/storage/data_stores/main/schema/delta/56/event_expiry.sql b/synapse/storage/data_stores/main/schema/delta/56/event_expiry.sql
new file mode 100644
index 0000000000..81a36a8b1d
--- /dev/null
+++ b/synapse/storage/data_stores/main/schema/delta/56/event_expiry.sql
@@ -0,0 +1,21 @@
+/* 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.
+ */
+
+CREATE TABLE IF NOT EXISTS event_expiry (
+ event_id TEXT PRIMARY KEY,
+ expiry_ts BIGINT NOT NULL
+);
+
+CREATE INDEX event_expiry_expiry_ts_idx ON event_expiry(expiry_ts);
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