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-rw-r--r--synapse/storage/databases/main/events.py38
1 files changed, 19 insertions, 19 deletions
diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index 9a80f419e3..b4abd961b9 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -17,7 +17,7 @@
 import itertools
 import logging
 from collections import OrderedDict, namedtuple
-from typing import TYPE_CHECKING, Dict, Iterable, List, Set, Tuple
+from typing import TYPE_CHECKING, Any, Dict, Iterable, List, Optional, Set, Tuple
 
 import attr
 from prometheus_client import Counter
@@ -52,16 +52,6 @@ event_counter = Counter(
 )
 
 
-def encode_json(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
-
-
 _EventCacheEntry = namedtuple("_EventCacheEntry", ("event", "redacted_event"))
 
 
@@ -156,15 +146,15 @@ class PersistEventsStore:
         # Note: Multiple instances of this function cannot be in flight at
         # the same time for the same room.
         if backfilled:
-            stream_ordering_manager = await self._backfill_id_gen.get_next_mult(
+            stream_ordering_manager = self._backfill_id_gen.get_next_mult(
                 len(events_and_contexts)
             )
         else:
-            stream_ordering_manager = await self._stream_id_gen.get_next_mult(
+            stream_ordering_manager = self._stream_id_gen.get_next_mult(
                 len(events_and_contexts)
             )
 
-        with stream_ordering_manager as stream_orderings:
+        async with stream_ordering_manager as stream_orderings:
             for (event, context), stream in zip(events_and_contexts, stream_orderings):
                 event.internal_metadata.stream_ordering = stream
 
@@ -341,6 +331,10 @@ class PersistEventsStore:
         min_stream_order = events_and_contexts[0][0].internal_metadata.stream_ordering
         max_stream_order = events_and_contexts[-1][0].internal_metadata.stream_ordering
 
+        # stream orderings should have been assigned by now
+        assert min_stream_order
+        assert max_stream_order
+
         self._update_forward_extremities_txn(
             txn,
             new_forward_extremities=new_forward_extremeties,
@@ -743,7 +737,9 @@ class PersistEventsStore:
                     logger.exception("")
                     raise
 
-                metadata_json = encode_json(event.internal_metadata.get_dict())
+                metadata_json = frozendict_json_encoder.encode(
+                    event.internal_metadata.get_dict()
+                )
 
                 sql = "UPDATE event_json SET internal_metadata = ? WHERE event_id = ?"
                 txn.execute(sql, (metadata_json, event.event_id))
@@ -797,10 +793,10 @@ class PersistEventsStore:
                 {
                     "event_id": event.event_id,
                     "room_id": event.room_id,
-                    "internal_metadata": encode_json(
+                    "internal_metadata": frozendict_json_encoder.encode(
                         event.internal_metadata.get_dict()
                     ),
-                    "json": encode_json(event_dict(event)),
+                    "json": frozendict_json_encoder.encode(event_dict(event)),
                     "format_version": event.format_version,
                 }
                 for event, _ in events_and_contexts
@@ -1108,6 +1104,10 @@ class PersistEventsStore:
     def _store_room_members_txn(self, txn, events, backfilled):
         """Store a room member in the database.
         """
+
+        def str_or_none(val: Any) -> Optional[str]:
+            return val if isinstance(val, str) else None
+
         self.db_pool.simple_insert_many_txn(
             txn,
             table="room_memberships",
@@ -1118,8 +1118,8 @@ class PersistEventsStore:
                     "sender": event.user_id,
                     "room_id": event.room_id,
                     "membership": event.membership,
-                    "display_name": event.content.get("displayname", None),
-                    "avatar_url": event.content.get("avatar_url", None),
+                    "display_name": str_or_none(event.content.get("displayname")),
+                    "avatar_url": str_or_none(event.content.get("avatar_url")),
                 }
                 for event in events
             ],