How to trigger Target lambda(Lambda2) based on Source Lambda(Lambda1) status only if Lambda1 is successful(Cannot modify Lambda1)

Question

HI,
How can i trigger target lambda(Lambda2) based on source lambda(Lambda1) success.I cannot modify Lambda1 so i need to get the status of Lambda1 and trigger Lambda2 only if Lambda1 is successful,Source Lambda runs monthly once at specific time.
Can you please suggest option to achieve this(like event bridge).
We have 2 lambda's(Lambda1 and Lambda2) which resides in same AWS account.

Answer

1) as mentioned above, leverage lambda estimation
2) use component in middle for asynchronous flow, such as SQS,SNS,Eventbridge
3)For synchronous  flow you can useInvoke api from Lambda1 to 2, though this highly couples the fictions.
https://docs.aws.amazon.com/lambda/latest/dg/API_Invoke.html

Answer

Lambda functions support [Lambda Destinations](https://docs.aws.amazon.com/lambda/latest/dg/invocation-async.html), which is used exactly for this use case. You can configure and onFailure target and an onSuccess target. The target can be SQS, SNS, EventBridge or a different Lambda functions.

Note that Lambda Destinations is only available for asynchronous invocations. As you said your function runs on a schedule, I assume it is an async invocation so it should work for you.

Answer

Hello.

Even without using EventBridge, it is possible to set up notifications to SNS when Lambda is successful, so how about running subsequent Lambdas via SNS?  
https://docs.aws.amazon.com/lambda/latest/dg/invocation-async.html#invocation-async-destinations

How to trigger Target lambda(Lambda2) based on Source Lambda(Lambda1) status only if Lambda1 is successful(Cannot modify Lambda1)

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