Stop populating unused table `local_invites`. (#7793)

This table is no longer used, so we may as well stop populating it. Removing it
would prevent people rolling back to older releases of Synapse, so that can
happen in a future release.

3 files changed, 24 insertions, 80 deletions

diff --git a/synapse/storage/data_stores/main/events.py b/synapse/storage/data_stores/main/events.py
index b7bf3fbd9d..a18317366c 100644
--- a/synapse/storage/data_stores/main/events.py
+++ b/synapse/storage/data_stores/main/events.py
@@ -27,12 +27,7 @@ from prometheus_client import Counter
 from twisted.internet import defer
 
 import synapse.metrics
-from synapse.api.constants import (
-    EventContentFields,
-    EventTypes,
-    Membership,
-    RelationTypes,
-)
+from synapse.api.constants import EventContentFields, EventTypes, RelationTypes
 from synapse.api.room_versions import RoomVersions
 from synapse.crypto.event_signing import compute_event_reference_hash
 from synapse.events import EventBase  # noqa: F401
@@ -819,7 +814,6 @@ class PersistEventsStore:
             "event_reference_hashes",
             "event_search",
             "event_to_state_groups",
-            "local_invites",
             "state_events",
             "rejections",
             "redactions",
@@ -1196,65 +1190,27 @@ class PersistEventsStore:
                 (event.state_key,),
             )
 
-            # We update the local_invites table only if the event is "current",
-            # i.e., its something that has just happened. If the event is an
-            # outlier it is only current if its an "out of band membership",
-            # like a remote invite or a rejection of a remote invite.
-            is_new_state = not backfilled and (
-                not event.internal_metadata.is_outlier()
-                or event.internal_metadata.is_out_of_band_membership()
-            )
-            is_mine = self.is_mine_id(event.state_key)
-            if is_new_state and is_mine:
-                if event.membership == Membership.INVITE:
-                    self.db.simple_insert_txn(
-                        txn,
-                        table="local_invites",
-                        values={
-                            "event_id": event.event_id,
-                            "invitee": event.state_key,
-                            "inviter": event.sender,
-                            "room_id": event.room_id,
-                            "stream_id": event.internal_metadata.stream_ordering,
-                        },
-                    )
-                else:
-                    sql = (
-                        "UPDATE local_invites SET stream_id = ?, replaced_by = ? WHERE"
-                        " room_id = ? AND invitee = ? AND locally_rejected is NULL"
-                        " AND replaced_by is NULL"
-                    )
-
-                    txn.execute(
-                        sql,
-                        (
-                            event.internal_metadata.stream_ordering,
-                            event.event_id,
-                            event.room_id,
-                            event.state_key,
-                        ),
-                    )
-
-                # We also update the `local_current_membership` table with
-                # latest invite info. This will usually get updated by the
-                # `current_state_events` handling, unless its an outlier.
-                if event.internal_metadata.is_outlier():
-                    # This should only happen for out of band memberships, so
-                    # we add a paranoia check.
-                    assert event.internal_metadata.is_out_of_band_membership()
-
-                    self.db.simple_upsert_txn(
-                        txn,
-                        table="local_current_membership",
-                        keyvalues={
-                            "room_id": event.room_id,
-                            "user_id": event.state_key,
-                        },
-                        values={
-                            "event_id": event.event_id,
-                            "membership": event.membership,
-                        },
-                    )
+            # We update the local_current_membership table only if the event is
+            # "current", i.e., its something that has just happened.
+            #
+            # This will usually get updated by the `current_state_events` handling,
+            # unless its an outlier, and an outlier is only "current" if it's an "out of
+            # band membership", like a remote invite or a rejection of a remote invite.
+            if (
+                self.is_mine_id(event.state_key)
+                and not backfilled
+                and event.internal_metadata.is_outlier()
+                and event.internal_metadata.is_out_of_band_membership()
+            ):
+                self.db.simple_upsert_txn(
+                    txn,
+                    table="local_current_membership",
+                    keyvalues={"room_id": event.room_id, "user_id": event.state_key},
+                    values={
+                        "event_id": event.event_id,
+                        "membership": event.membership,
+                    },
+                )
 
     def _handle_event_relations(self, txn, event):
         """Handles inserting relation data during peristence of events
@@ -1591,16 +1547,8 @@ class PersistEventsStore:
         create a leave event for it.
         """
 
-        sql = (
-            "UPDATE local_invites SET stream_id = ?, locally_rejected = ? WHERE"
-            " room_id = ? AND invitee = ? AND locally_rejected is NULL"
-            " AND replaced_by is NULL"
-        )
-
         def f(txn, stream_ordering):
-            txn.execute(sql, (stream_ordering, True, room_id, user_id))
-
-            # We also clear this entry from `local_current_membership`.
+            # Clear this entry from `local_current_membership`.
             # Ideally we'd point to a leave event, but we don't have one, so
             # nevermind.
             self.db.simple_delete_txn(
diff --git a/synapse/storage/data_stores/main/events_worker.py b/synapse/storage/data_stores/main/events_worker.py
index 47a3e63589..01cad7d4fa 100644
--- a/synapse/storage/data_stores/main/events_worker.py
+++ b/synapse/storage/data_stores/main/events_worker.py
@@ -82,10 +82,7 @@ class EventsWorkerStore(SQLBaseStore):
             # We are the process in charge of generating stream ids for events,
             # so instantiate ID generators based on the database
             self._stream_id_gen = StreamIdGenerator(
-                db_conn,
-                "events",
-                "stream_ordering",
-                extra_tables=[("local_invites", "stream_id")],
+                db_conn, "events", "stream_ordering",
             )
             self._backfill_id_gen = StreamIdGenerator(
                 db_conn,
diff --git a/synapse/storage/data_stores/main/purge_events.py b/synapse/storage/data_stores/main/purge_events.py
index a93e1ef198..6546569139 100644
--- a/synapse/storage/data_stores/main/purge_events.py
+++ b/synapse/storage/data_stores/main/purge_events.py
@@ -361,7 +361,6 @@ class PurgeEventsStore(StateGroupWorkerStore, SQLBaseStore):
             "event_push_summary",
             "pusher_throttle",
             "group_summary_rooms",
-            "local_invites",
             "room_account_data",
             "room_tags",
             "local_current_membership",