graphql-engine/server/src-lib/Hasura/GraphQL/Transport
Vamshi Surabhi c52bfc540d
More robust forking, exception safety. Closes #3768 (#3860)
This is the result of a general audit of how we fork threads, with a
detour into how we're using mutable state especially in websocket
codepaths, making more robust to async exceptions and exceptions
resulting from bugs.

Some highlights:
- use a wrapper around 'immortal' so threads that die due to bugs are
  restarted, and log the error
- use 'withAsync' some places
- use bracket a few places where we might break invariants
- log some codepaths that represent bugs
- export UnstructuredLog for ad hoc logging (the alternative is we
  continue not logging useful stuff)

I had to timebox this. There are a few TODOs I didn't want to address.
And we'll wait until this is merged to attempt #3705 for
Control.Concurrent.Extended
2020-03-05 23:29:26 +05:30
..
HTTP Add caching for recreating event trigger functions 2020-01-08 16:45:46 -06:00
WebSocket More robust forking, exception safety. Closes #3768 (#3860) 2020-03-05 23:29:26 +05:30
HTTP.hs allow custom mutations through actions (#3042) 2020-02-13 23:08:23 +05:30
WebSocket.hs More robust forking, exception safety. Closes #3768 (#3860) 2020-03-05 23:29:26 +05:30