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openwhisk-wrapper: Haskell-based OpenWhisk services

Provides:

  • A library which wraps functions as OpenWhisk services (based on dockerSkeleton).

  • An example using split docker images:

    • Build phase: based on haskell:7.10.3 image
    • Deploy phase: uses haskell-scratch image

Usage:

  1. Write the logic of your service, which should be a function with type Value -> IO (Maybe Value)

    myService :: Value -> IO (Maybe Value) -- consumes and produces JSON objects
    myService = pure . Right . id -- service logic, e.g. this echoes input data
    
  2. Wrap your service with openwhiskWrapper function (see Network.OpenWhisk module)

    main :: IO ()
    main = openwhiskWrapper myService
    
  3. Create docker image (see Dockerfile and make-image.sh script)

  4. Upload the image to docker hub

  5. Use wsk utility in order to instantiate an action with your image.

    wsk action update --docker action-name docker-hub-user/docker-hub-image