Extend MessageReaction when encountering unknown values

fbchat/graphql.py

@@ -214,7 +214,16 @@ def graphql_to_message(message):
     rtn.timestamp = message.get('timestamp_precise')
     if message.get('unread') is not None:
         rtn.is_read = not message['unread']
-    rtn.reactions = {str(r['user']['id']):MessageReaction(r['reaction']) for r in message.get('message_reactions')}
+
+    for r in message.get('message_reactions'):
+        try:
+            reaction = MessageReaction(r['reaction'])
+        except ValueError:
+            log.warning("Failed parsing reaction {}. Extending enum.".format(r['reaction']))
+            aenum.extend_enum(MessageReaction, "UNKNOWN_{}".format(r['reaction']), r['reaction'])
+            reaction = MessageReaction(r['reaction'])
+        rtn.reactions[str(r['user']['id'])] = reaction
+
     if message.get('blob_attachments') is not None:
         rtn.attachments = [graphql_to_attachment(attachment) for attachment in message['blob_attachments']]
     # TODO: This is still missing parsing: