CODEWITHSUNDEEP
amazon-web-servicesaws-step-functions
men6288
men6288

Reputation: 69

Delicate cancelation of step functions

Is there a way to cancel a state machine execution without fully exiting the step functions? Our state machine has a failure path that does a lot of cleanup which would be missed if the execution is canceled mid workflow.

I am stumped and not sure if anyone else has ever come across a solution to this?

/MN

Upvotes: 0

Views: 1496

Answers (2)

Brian
Brian

Reputation: 2800

I know this is an old question, but I have run into a similar use case. I wish I could just do it all in my state machine, but so far I have not found that capability. What I implemented instead was to have a Lambda function that is triggered by an EventBridge rule. I use an EventBridge rule with:

EventPattern:
  source:
    - aws.states
  detail-type:
    - Step Functions Execution Status Change
  detail:
    status:
      - SUCCEEDED
      - FAILED
      - ABORTED
      - TIMED_OUT

Then in my Lambda function I can inspect the event and the execution history to perform my cleanup.

Upvotes: 5

lynkfox
lynkfox

Reputation: 2400

Wrap the entire state machine in a parallel state task but only have the one branch - your main path. You can then attach a catch for "States.All" and point that to your cleanup lambda tasks.

But if you mean cancel as in actively use the CLI or an SDK to cancel a state machine execution with stop execution Then there isn't a way to do so inside the states machine. However. If you use the SDK to send the call from inside a lambda you could call your clean up functionality after that (even call the same lambdas/services your step function uses) and get most of what you probably need out of describe execution CLI/SDK command

Upvotes: 0

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