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-rw-r--r--synapse/storage/state.py42
1 files changed, 39 insertions, 3 deletions
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index ffa4246031..55159e64d0 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -198,8 +198,15 @@ class StateGroupWorkerStore(SQLBaseStore):
 
     def _get_state_groups_from_groups_txn(self, txn, groups, types=None):
         results = {group: {} for group in groups}
+
+        include_other_types = False
+
         if types is not None:
-            types = list(set(types))  # deduplicate types list
+            type_set = set(types)
+            if (None, None) in type_set:
+                include_other_types = True
+                type_set.remove((None, None))
+            types = list(type_set)  # deduplicate types list
 
         if isinstance(self.database_engine, PostgresEngine):
             # Temporarily disable sequential scans in this transaction. This is
@@ -246,6 +253,17 @@ class StateGroupWorkerStore(SQLBaseStore):
                     )
                     for etype, state_key in types
                 ]
+
+                if include_other_types:
+                    # XXX: check whether this slows postgres down like a list of
+                    # ORs does too?
+                    unique_types = set([t for (t, _) in types])
+                    clause_to_args.append(
+                        (
+                            "AND type <> ? " * len(unique_types),
+                            list(unique_types)
+                        )
+                    )
             else:
                 # If types is None we fetch all the state, and so just use an
                 # empty where clause with no extra args.
@@ -274,6 +292,14 @@ class StateGroupWorkerStore(SQLBaseStore):
                     else:
                         where_clauses.append("(type = ? AND state_key = ?)")
                         where_args.extend([typ[0], typ[1]])
+
+                if include_other_types:
+                    unique_types = set([t for (t, _) in types])
+                    where_clauses.append(
+                        "(" + " AND ".join(["type <> ?"] * len(unique_types)) + ")"
+                    )
+                    where_args.extend(list(unique_types))
+
                 where_clause = "AND (%s)" % (" OR ".join(where_clauses))
             else:
                 where_clause = ""
@@ -469,17 +495,27 @@ class StateGroupWorkerStore(SQLBaseStore):
             group: The state group to lookup
             types (list): List of 2-tuples of the form (`type`, `state_key`),
                 where a `state_key` of `None` matches all state_keys for the
-                `type`.
+                `type`. Presence of type of `None` indicates that types not
+                in the list should not be filtered out.
         """
         is_all, known_absent, state_dict_ids = self._state_group_cache.get(group)
 
         type_to_key = {}
         missing_types = set()
 
+        include_other_types = False
+
         for typ, state_key in types:
             key = (typ, state_key)
+
+            if typ is None:
+                include_other_types = True
+                next
+
             if state_key is None:
                 type_to_key[typ] = None
+                # XXX: why do we mark the type as missing from our cache just
+                # because we weren't filtering on a specific value of state_key?
                 missing_types.add(key)
             else:
                 if type_to_key.get(typ, object()) is not None:
@@ -493,7 +529,7 @@ class StateGroupWorkerStore(SQLBaseStore):
         def include(typ, state_key):
             valid_state_keys = type_to_key.get(typ, sentinel)
             if valid_state_keys is sentinel:
-                return False
+                return include_other_types
             if valid_state_keys is None:
                 return True
             if state_key in valid_state_keys: