Roll back database session on exceptions

todosrht-lmtp

@@ -98,6 +98,13 @@ class MailHandler:
         print(f"Created ticket {ticket.ref()}")
 
     async def handle_DATA(self, server, session, envelope):
+        try:
+            return await self._handle_data(server, session, envelope)
+        except:
+            db.session.rollback()
+            raise
+
+    async def _handle_DATA(self, server, session, envelope):
         address = envelope.rcpt_tos[0]
 
         mail = email.message_from_bytes(envelope.content,

todosrht/access.py

@@ -3,7 +3,7 @@ from todosrht.types import User, Tracker, Ticket
 from todosrht.types import TicketAccess
 
 def get_access(tracker, ticket, user=None):
-    if user == None:
+    if user is None:
         user = current_user
     # TODO: flesh out
     if user and user.id == tracker.owner_id: