1 files changed, 7 insertions, 8 deletions
diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py
index 28ef7cfdb9..32c31b1cd1 100644
--- a/synapse/crypto/keyring.py
+++ b/synapse/crypto/keyring.py
@@ -57,7 +57,7 @@ logger = logging.getLogger(__name__)
 
 
 @attr.s(slots=True, cmp=False)
-class VerifyJsonRequest(object):
+class VerifyJsonRequest:
     """
     A request to verify a JSON object.
 
@@ -96,7 +96,7 @@ class KeyLookupError(ValueError):
     pass
 
 
-class Keyring(object):
+class Keyring:
     def __init__(self, hs, key_fetchers=None):
         self.clock = hs.get_clock()
 
@@ -420,7 +420,7 @@ class Keyring(object):
         remaining_requests.difference_update(completed)
 
 
-class KeyFetcher(object):
+class KeyFetcher:
     async def get_keys(self, keys_to_fetch):
         """
         Args:
@@ -456,7 +456,7 @@ class StoreKeyFetcher(KeyFetcher):
         return keys
 
 
-class BaseV2KeyFetcher(object):
+class BaseV2KeyFetcher:
     def __init__(self, hs):
         self.store = hs.get_datastore()
         self.config = hs.get_config()
@@ -757,9 +757,8 @@ class ServerKeyFetcher(BaseV2KeyFetcher):
             except Exception:
                 logger.exception("Error getting keys %s from %s", key_ids, server_name)
 
-        return await yieldable_gather_results(
-            get_key, keys_to_fetch.items()
-        ).addCallback(lambda _: results)
+        await yieldable_gather_results(get_key, keys_to_fetch.items())
+        return results
 
     async def get_server_verify_key_v2_direct(self, server_name, key_ids):
         """
@@ -769,7 +768,7 @@ class ServerKeyFetcher(BaseV2KeyFetcher):
             key_ids (iterable[str]):
 
         Returns:
-            Deferred[dict[str, FetchKeyResult]]: map from key ID to lookup result
+            dict[str, FetchKeyResult]: map from key ID to lookup result
 
         Raises:
             KeyLookupError if there was a problem making the lookup