From 5c261107c9b5bf82a51c27fd6cb85e2199e539e3 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Thu, 9 Aug 2018 15:34:56 +0100
Subject: [PATCH] Remove unnecessary resolve_events_with_state_map

We only ever used the synchronous resolve_events_with_state_map in one
place, which is trivial to replace with the async version.
---
 synapse/handlers/federation.py |  2 +-
 synapse/state/__init__.py      | 34 ++++++----------------------------
 synapse/state/v1.py            | 28 ----------------------------
 3 files changed, 7 insertions(+), 57 deletions(-)

diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 0ebf0fd188..3fa7a98445 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -1831,7 +1831,7 @@ class FederationHandler(BaseHandler):
 
                 room_version = yield self.store.get_room_version(event.room_id)
 
-                new_state = self.state_handler.resolve_events(
+                new_state = yield self.state_handler.resolve_events(
                     room_version,
                     [list(local_view.values()), list(remote_view.values())],
                     event
diff --git a/synapse/state/__init__.py b/synapse/state/__init__.py
index b34970e4d1..d7ae22a661 100644
--- a/synapse/state/__init__.py
+++ b/synapse/state/__init__.py
@@ -385,6 +385,7 @@ class StateHandler(object):
             ev_ids, get_prev_content=False, check_redacted=False,
         )
 
+    @defer.inlineCallbacks
     def resolve_events(self, room_version, state_sets, event):
         logger.info(
             "Resolving state for %s with %d groups", event.room_id, len(state_sets)
@@ -401,15 +402,17 @@ class StateHandler(object):
         }
 
         with Measure(self.clock, "state._resolve_events"):
-            new_state = resolve_events_with_state_map(
-                room_version, state_set_ids, state_map,
+            new_state = yield resolve_events_with_factory(
+                room_version, state_set_ids,
+                event_map=state_map,
+                state_map_factory=self._state_map_factory
             )
 
         new_state = {
             key: state_map[ev_id] for key, ev_id in iteritems(new_state)
         }
 
-        return new_state
+        defer.returnValue(new_state)
 
 
 class StateResolutionHandler(object):
@@ -589,31 +592,6 @@ def _make_state_cache_entry(
     )
 
 
-def resolve_events_with_state_map(room_version, state_sets, state_map):
-    """
-    Args:
-        room_version(str): Version of the room
-        state_sets(list): List of dicts of (type, state_key) -> event_id,
-            which are the different state groups to resolve.
-        state_map(dict): a dict from event_id to event, for all events in
-            state_sets.
-
-    Returns
-        dict[(str, str), str]:
-            a map from (type, state_key) to event_id.
-    """
-    if room_version in (RoomVersions.V1, RoomVersions.VDH_TEST,):
-        return v1.resolve_events_with_state_map(
-            state_sets, state_map,
-        )
-    else:
-        # This should only happen if we added a version but forgot to add it to
-        # the list above.
-        raise Exception(
-            "No state resolution algorithm defined for version %r" % (room_version,)
-        )
-
-
 def resolve_events_with_factory(room_version, state_sets, event_map, state_map_factory):
     """
     Args:
diff --git a/synapse/state/v1.py b/synapse/state/v1.py
index 3a1f7054a1..c95477d318 100644
--- a/synapse/state/v1.py
+++ b/synapse/state/v1.py
@@ -30,34 +30,6 @@ logger = logging.getLogger(__name__)
 POWER_KEY = (EventTypes.PowerLevels, "")
 
 
-def resolve_events_with_state_map(state_sets, state_map):
-    """
-    Args:
-        state_sets(list): List of dicts of (type, state_key) -> event_id,
-            which are the different state groups to resolve.
-        state_map(dict): a dict from event_id to event, for all events in
-            state_sets.
-
-    Returns
-        dict[(str, str), str]:
-            a map from (type, state_key) to event_id.
-    """
-    if len(state_sets) == 1:
-        return state_sets[0]
-
-    unconflicted_state, conflicted_state = _seperate(
-        state_sets,
-    )
-
-    auth_events = _create_auth_events_from_maps(
-        unconflicted_state, conflicted_state, state_map
-    )
-
-    return _resolve_with_state(
-        unconflicted_state, conflicted_state, auth_events, state_map
-    )
-
-
 @defer.inlineCallbacks
 def resolve_events_with_factory(state_sets, event_map, state_map_factory):
     """