1 files changed, 15 insertions, 5 deletions
diff --git a/synapse/storage/signatures.py b/synapse/storage/signatures.py
index 9e6eaaa532..470212aa2a 100644
--- a/synapse/storage/signatures.py
+++ b/synapse/storage/signatures.py
@@ -13,14 +13,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from twisted.internet import defer
-
-from ._base import SQLBaseStore
+import six
 
 from unpaddedbase64 import encode_base64
+
+from twisted.internet import defer
+
 from synapse.crypto.event_signing import compute_event_reference_hash
 from synapse.util.caches.descriptors import cached, cachedList
 
+from ._base import SQLBaseStore
+
+# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
+# despite being deprecated and removed in favor of memoryview
+if six.PY2:
+    db_binary_type = buffer
+else:
+    db_binary_type = memoryview
+
 
 class SignatureWorkerStore(SQLBaseStore):
     @cached()
@@ -56,7 +66,7 @@ class SignatureWorkerStore(SQLBaseStore):
             for e_id, h in hashes.items()
         }
 
-        defer.returnValue(hashes.items())
+        defer.returnValue(list(hashes.items()))
 
     def _get_event_reference_hashes_txn(self, txn, event_id):
         """Get all the hashes for a given PDU.
@@ -91,7 +101,7 @@ class SignatureStore(SignatureWorkerStore):
             vals.append({
                 "event_id": event.event_id,
                 "algorithm": ref_alg,
-                "hash": buffer(ref_hash_bytes),
+                "hash": db_binary_type(ref_hash_bytes),
             })
 
         self._simple_insert_many_txn(