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-rw-r--r--synapse/storage/events.py14
-rw-r--r--synapse/storage/signatures.py2
2 files changed, 11 insertions, 5 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index c98e524ba1..61223da1a5 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -67,7 +67,13 @@ state_delta_reuse_delta_counter = Counter(
 
 
 def encode_json(json_object):
-    return frozendict_json_encoder.encode(json_object)
+    """
+    Encode a Python object as JSON and return it in a Unicode string.
+    """
+    out = frozendict_json_encoder.encode(json_object)
+    if isinstance(out, bytes):
+        out = out.decode('utf8')
+    return out
 
 
 class _EventPeristenceQueue(object):
@@ -1058,7 +1064,7 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
 
                 metadata_json = encode_json(
                     event.internal_metadata.get_dict()
-                ).decode("UTF-8")
+                )
 
                 sql = (
                     "UPDATE event_json SET internal_metadata = ?"
@@ -1172,8 +1178,8 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
                     "room_id": event.room_id,
                     "internal_metadata": encode_json(
                         event.internal_metadata.get_dict()
-                    ).decode("UTF-8"),
-                    "json": encode_json(event_dict(event)).decode("UTF-8"),
+                    ),
+                    "json": encode_json(event_dict(event)),
                 }
                 for event, _ in events_and_contexts
             ],
diff --git a/synapse/storage/signatures.py b/synapse/storage/signatures.py
index 470212aa2a..5623391f6e 100644
--- a/synapse/storage/signatures.py
+++ b/synapse/storage/signatures.py
@@ -74,7 +74,7 @@ class SignatureWorkerStore(SQLBaseStore):
             txn (cursor):
             event_id (str): Id for the Event.
         Returns:
-            A dict of algorithm -> hash.
+            A dict[unicode, bytes] of algorithm -> hash.
         """
         query = (
             "SELECT algorithm, hash"