Is it possible to publish a message (to a client subscription) via a socket within/from a Lambda Step Function?

[josoroma-zz]

Question:

Is it possible to publish a message (to a client subscription) via a socket within/from a Lambda Step Function?

I was wondering... in the last step of a sequential state machine execution, is it possible to notify back to the user client a custom response via sls api gateway websockets?

I am asking this because the only response I am currently getting back is:

Authenticating with User Pool
Getting temporary credentials
Making API request

{ status: 200,
  statusText: 'OK',
  data:
   { executionArn:
      'arn:aws:states:us-east-1:333:execution:generateCourse:generateCourse111-333-999',
     startDate: '2020-01-21T19:26:47.668Z',
     status: 200 } }

Would be great to hear what should I research in order to implement a kind of custom-data wss response to the user?

[andyrichardson]

Hey, I can answer this!

You can send a message to a socket from any lambda. API Gateway is a completely separate beast, you'll just need to make sure:

• the lambda has IAM authorization
• the lambda knows the ID of the connection it wants to message

I don't think this is what you were asking but, if you wanted to invoke the step function with a API Gateway WebSocket event, that currently isn't possible #440