broker sometimes crashes with "cannot rollback - no transaction is active"

[Robie Basak]

Sep 20 09:22:35 timburr git-ubuntu[2333458]: Traceback (most recent call last):
Sep 20 09:22:35 timburr git-ubuntu[2333458]: File "/snap/git-ubuntu/x8/bin/git-ubuntu", line 11, in <module>
Sep 20 09:22:35 timburr git-ubuntu[2333458]: load_entry_point('gitubuntu==1.0rc1', 'console_scripts', 'git-ubuntu')()
Sep 20 09:22:35 timburr git-ubuntu[2333458]: File "/snap/git-ubuntu/x8/lib/python3.6/site-packages/gitubuntu/__main__.py", line 279, in main
Sep 20 09:22:35 timburr git-ubuntu[2333458]: sys.exit(args.func(args))
Sep 20 09:22:35 timburr git-ubuntu[2333458]: File "/snap/git-ubuntu/x8/lib/python3.6/site-packages/gitubuntu/importer_service_broker.py", line 165, in cli_main
Sep 20 09:22:35 timburr git-ubuntu[2333458]: worker_broker_socket_address=args.worker_broker_socket_address,
Sep 20 09:22:35 timburr git-ubuntu[2333458]: File "/snap/git-ubuntu/x8/lib/python3.6/site-packages/gitubuntu/importer_service_broker.py", line 129, in main
Sep 20 09:22:35 timburr git-ubuntu[2333458]: main_loop(worker_socket, service_state) # never returns
Sep 20 09:22:35 timburr git-ubuntu[2333458]: File "/snap/git-ubuntu/x8/lib/python3.6/site-packages/gitubuntu/importer_service_broker.py", line 109, in main_loop
Sep 20 09:22:35 timburr git-ubuntu[2333458]: handle_reply(service_state, reply)
Sep 20 09:22:35 timburr git-ubuntu[2333458]: File "/snap/git-ubuntu/x8/lib/python3.6/site-packages/gitubuntu/importer_service_broker.py", line 77, in handle_reply
Sep 20 09:22:35 timburr git-ubuntu[2333458]: reply.identity,
Sep 20 09:22:35 timburr git-ubuntu[2333458]: File "/snap/git-ubuntu/x8/lib/python3.6/site-packages/gitubuntu/importer_service.py", line 108, in wrapper
Sep 20 09:22:35 timburr git-ubuntu[2333458]: self.db.execute('ROLLBACK')
Sep 20 09:22:35 timburr git-ubuntu[2333458]: sqlite3.OperationalError: cannot rollback - no transaction is active

Version: 1.0-rc1+git67.7afdac0