InvocationType for AWS Lambda trigger

[mrkwtz]

Is your feature request related to a problem? Please describe.
I want to make use of AWS Lambdas DeadLetterQueue feature for errors while processing async Lambda invocations. But right now it's not possible to do a async invocation while it could be.

Describe the solution you'd like
I'd like to have a InvocationType parameter in the Lambda trigger.

Describe alternatives you've considered
For this case it's all about error handling. When I execute a Lambda function and it fails I want to be able to act on it. It would be awesome if argo-events itself has this feature, but for now I don't see a way to handle failed triggers within argo-events.

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[alexec]

Is this the case of adding an additional invoke input? Would you like to submit a PR?

[VaibhavPage]

@mrkwtz can you explain your use-case when you say "acting on failed lambda"?

[mrkwtz]

@VaibhavPage, sure. When you configure a DeadLetterQueue (DLQ) in a Lambda function, failed invocations go straight to this queue from where another process could pick them up and report them or try the same event again but maybe with a more resilient and failure tolerant second function. Unfortunately DLQs are only considered when you do an asynchronous invocation of a Lambda function. So the Lambda trigger has to be extended to support the additional parameter.