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-rw-r--r--synapse/federation/transport/client.py22
-rw-r--r--synapse/federation/transport/server.py16
2 files changed, 35 insertions, 3 deletions
diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py
index ebb698e278..3d088e43cb 100644
--- a/synapse/federation/transport/client.py
+++ b/synapse/federation/transport/client.py
@@ -55,6 +55,28 @@ class TransportLayerClient(object):
         )
 
     @log_function
+    def get_room_state_ids(self, destination, room_id, event_id):
+        """ Requests all state for a given room from the given server at the
+        given event. Returns the state's event_id's
+
+        Args:
+            destination (str): The host name of the remote home server we want
+                to get the state from.
+            context (str): The name of the context we want the state of
+            event_id (str): The event we want the context at.
+
+        Returns:
+            Deferred: Results in a dict received from the remote homeserver.
+        """
+        logger.debug("get_room_state_ids dest=%s, room=%s",
+                     destination, room_id)
+
+        path = PREFIX + "/state_ids/%s/" % room_id
+        return self.client.get_json(
+            destination, path=path, args={"event_id": event_id},
+        )
+
+    @log_function
     def get_event(self, destination, event_id, timeout=None):
         """ Requests the pdu with give id and origin from the given server.
 
diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py
index 26fa88ae84..0bc6e0801d 100644
--- a/synapse/federation/transport/server.py
+++ b/synapse/federation/transport/server.py
@@ -271,6 +271,17 @@ class FederationStateServlet(BaseFederationServlet):
         )
 
 
+class FederationStateIdsServlet(BaseFederationServlet):
+    PATH = "/state_ids/(?P<room_id>[^/]*)/"
+
+    def on_GET(self, origin, content, query, room_id):
+        return self.handler.on_state_ids_request(
+            origin,
+            room_id,
+            query.get("event_id", [None])[0],
+        )
+
+
 class FederationBackfillServlet(BaseFederationServlet):
     PATH = "/backfill/(?P<context>[^/]*)/"
 
@@ -367,10 +378,8 @@ class FederationThirdPartyInviteExchangeServlet(BaseFederationServlet):
 class FederationClientKeysQueryServlet(BaseFederationServlet):
     PATH = "/user/keys/query"
 
-    @defer.inlineCallbacks
     def on_POST(self, origin, content, query):
-        response = yield self.handler.on_query_client_keys(origin, content)
-        defer.returnValue((200, response))
+        return self.handler.on_query_client_keys(origin, content)
 
 
 class FederationClientKeysClaimServlet(BaseFederationServlet):
@@ -538,6 +547,7 @@ SERVLET_CLASSES = (
     FederationPullServlet,
     FederationEventServlet,
     FederationStateServlet,
+    FederationStateIdsServlet,
     FederationBackfillServlet,
     FederationQueryServlet,
     FederationMakeJoinServlet,