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-rw-r--r--synapse/handlers/sync.py12
-rw-r--r--synapse/storage/deviceinbox.py3
2 files changed, 10 insertions, 5 deletions
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index b62773dcbe..c880f61685 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -576,16 +576,20 @@ class SyncHandler(object):
             # We only delete messages when a new message comes in, but that's
             # fine so long as we delete them at some point.
 
-            logger.debug("Deleting messages up to %d", since_stream_id)
-            yield self.store.delete_messages_for_device(
+            deleted = yield self.store.delete_messages_for_device(
                 user_id, device_id, since_stream_id
             )
+            logger.info("Deleted %d to-device messages up to %d",
+                        deleted, since_stream_id)
 
-            logger.debug("Getting messages up to %d", now_token.to_device_key)
             messages, stream_id = yield self.store.get_new_messages_for_device(
                 user_id, device_id, since_stream_id, now_token.to_device_key
             )
-            logger.debug("Got messages up to %d: %r", stream_id, messages)
+
+            logger.info(
+                "Returning %d to-device messages between %d and %d (current token: %d)",
+                len(messages), since_stream_id, stream_id, now_token.to_device_key
+            )
             sync_result_builder.now_token = now_token.copy_and_replace(
                 "to_device_key", stream_id
             )
diff --git a/synapse/storage/deviceinbox.py b/synapse/storage/deviceinbox.py
index 87398d60bc..2821eb89c9 100644
--- a/synapse/storage/deviceinbox.py
+++ b/synapse/storage/deviceinbox.py
@@ -242,7 +242,7 @@ class DeviceInboxStore(SQLBaseStore):
             device_id(str): The recipient device_id.
             up_to_stream_id(int): Where to delete messages up to.
         Returns:
-            A deferred that resolves when the messages have been deleted.
+            A deferred that resolves to the number of messages deleted.
         """
         def delete_messages_for_device_txn(txn):
             sql = (
@@ -251,6 +251,7 @@ class DeviceInboxStore(SQLBaseStore):
                 " AND stream_id <= ?"
             )
             txn.execute(sql, (user_id, device_id, up_to_stream_id))
+            return txn.rowcount
 
         return self.runInteraction(
             "delete_messages_for_device", delete_messages_for_device_txn