From a2c89a225c567df53cc6d29af397547f4e9a4a2f Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Tue, 2 May 2017 10:40:31 +0100
Subject: [PATCH] Prefill state caches

---
 synapse/storage/_base.py  | 8 ++++----
 synapse/storage/events.py | 8 ++++++--
 synapse/storage/state.py  | 8 ++++++++
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index c659004e8d..58b73af7d2 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -60,12 +60,12 @@ class LoggingTransaction(object):
         object.__setattr__(self, "database_engine", database_engine)
         object.__setattr__(self, "after_callbacks", after_callbacks)
 
-    def call_after(self, callback, *args):
+    def call_after(self, callback, *args, **kwargs):
         """Call the given callback on the main twisted thread after the
         transaction has finished. Used to invalidate the caches on the
         correct thread.
         """
-        self.after_callbacks.append((callback, args))
+        self.after_callbacks.append((callback, args, kwargs))
 
     def __getattr__(self, name):
         return getattr(self.txn, name)
@@ -319,8 +319,8 @@ class SQLBaseStore(object):
                     inner_func, *args, **kwargs
                 )
         finally:
-            for after_callback, after_args in after_callbacks:
-                after_callback(*after_args)
+            for after_callback, after_args, after_kwargs in after_callbacks:
+                after_callback(*after_args, **after_kwargs)
         defer.returnValue(result)
 
     @defer.inlineCallbacks
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index a3790419dd..a8d1b93d99 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -370,6 +370,10 @@ class EventsStore(SQLBaseStore):
                     new_forward_extremeties=new_forward_extremeties,
                 )
                 persist_event_counter.inc_by(len(chunk))
+                for room_id, (_, _, new_state) in current_state_for_room.iteritems():
+                    self.get_current_state_ids.prefill(
+                        (room_id, ), new_state
+                    )
 
     @defer.inlineCallbacks
     def _calculate_new_extremeties(self, room_id, event_contexts, latest_event_ids):
@@ -529,7 +533,7 @@ class EventsStore(SQLBaseStore):
             if ev_id in events_to_insert
         }
 
-        defer.returnValue((to_delete, to_insert))
+        defer.returnValue((to_delete, to_insert, current_state))
 
     @defer.inlineCallbacks
     def get_event(self, event_id, check_redacted=True,
@@ -682,7 +686,7 @@ class EventsStore(SQLBaseStore):
 
     def _update_current_state_txn(self, txn, state_delta_by_room):
         for room_id, current_state_tuple in state_delta_by_room.iteritems():
-                to_delete, to_insert = current_state_tuple
+                to_delete, to_insert, _ = current_state_tuple
                 txn.executemany(
                     "DELETE FROM current_state_events WHERE event_id = ?",
                     [(ev_id,) for ev_id in to_delete.itervalues()],
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index a16afa8df5..1e1ce87e0e 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -227,6 +227,14 @@ class StateStore(SQLBaseStore):
                     ],
                 )
 
+            txn.call_after(
+                self._state_group_cache.update,
+                self._state_group_cache.sequence,
+                key=context.state_group,
+                value=context.current_state_ids,
+                full=True,
+            )
+
         self._simple_insert_many_txn(
             txn,
             table="event_to_state_groups",