From a584a81b3e59e9a4763d81d1a8b893fbd1a45ce0 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Tue, 30 May 2017 14:41:42 +0100
Subject: [PATCH] Add current_state_delta_stream table

---
 synapse/storage/events.py                     | 31 ++++++++++++++-----
 .../schema/delta/42/current_state_delta.sql   | 25 +++++++++++++++
 2 files changed, 48 insertions(+), 8 deletions(-)
 create mode 100644 synapse/storage/schema/delta/42/current_state_delta.sql

diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 3d4f53ea55..c37a2a6f16 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -648,9 +648,10 @@ class EventsStore(SQLBaseStore):
                 list of the event ids which are the forward extremities.
 
         """
-        self._update_current_state_txn(txn, current_state_for_room)
-
         max_stream_order = events_and_contexts[-1][0].internal_metadata.stream_ordering
+
+        self._update_current_state_txn(txn, current_state_for_room, max_stream_order)
+
         self._update_forward_extremities_txn(
             txn,
             new_forward_extremities=new_forward_extremeties,
@@ -713,7 +714,7 @@ class EventsStore(SQLBaseStore):
             backfilled=backfilled,
         )
 
-    def _update_current_state_txn(self, txn, state_delta_by_room):
+    def _update_current_state_txn(self, txn, state_delta_by_room, max_stream_order):
         for room_id, current_state_tuple in state_delta_by_room.iteritems():
                 to_delete, to_insert, _ = current_state_tuple
                 txn.executemany(
@@ -735,6 +736,24 @@ class EventsStore(SQLBaseStore):
                     ],
                 )
 
+                state_deltas = {key: None for key in to_delete}
+                state_deltas.update(to_insert)
+
+                self._simple_insert_many_txn(
+                    txn,
+                    table="current_state_delta_stream",
+                    values=[
+                        {
+                            "stream_id": max_stream_order,
+                            "room_id": room_id,
+                            "type": key[0],
+                            "state_key": key[1],
+                            "event_id": ev_id,
+                        }
+                        for key, ev_id in state_deltas.iteritems()
+                    ]
+                )
+
                 # Invalidate the various caches
 
                 # Figure out the changes of membership to invalidate the
@@ -743,11 +762,7 @@ class EventsStore(SQLBaseStore):
                 # and which we have added, then we invlidate the caches for all
                 # those users.
                 members_changed = set(
-                    state_key for ev_type, state_key in to_delete.iterkeys()
-                    if ev_type == EventTypes.Member
-                )
-                members_changed.update(
-                    state_key for ev_type, state_key in to_insert.iterkeys()
+                    state_key for ev_type, state_key in state_deltas
                     if ev_type == EventTypes.Member
                 )
 
diff --git a/synapse/storage/schema/delta/42/current_state_delta.sql b/synapse/storage/schema/delta/42/current_state_delta.sql
new file mode 100644
index 0000000000..1a55aa912b
--- /dev/null
+++ b/synapse/storage/schema/delta/42/current_state_delta.sql
@@ -0,0 +1,25 @@
+/* Copyright 2017 Vector Creations Ltd
+ *
+ * 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 current_state_delta_stream (
+    stream_id BIGINT NOT NULL,
+    room_id TEXT NOT NULL,
+    type TEXT NOT NULL,
+    state_key TEXT NOT NULL,
+    event_id TEXT  -- Is null if the key was removed
+);
+
+CREATE INDEX current_state_delta_stream_idx ON current_state_delta_stream(stream_id);