Aws Lambda call to external api after callback

Question

I have a lambda function that sends http call to a API(Let's say 'A'). After getting response from 'A' Immediately return the stuff's to the caller i.e., (callback(null, success)) within 10secs. Then save the Data fetched from API 'A' to My External API(Let's Say 'B').

I tried like below but Lambda waits until event loop is empty(It is waiting for the response from second http call).

I doesn't want to set the eventLoopWaitEmpty to false since it freezes the eventloop and Execute next time when invoked.

request.get({url: endpointUrlA}, function (errorA, responseA, bodyA) { callback(null, "success"); request.post({url: endpointUrlB, body: bodyA, json: true}, function(errorB, responseB, bodyB){ //Doesn't want to wait for this response }); /* Also tried the callback(null, "success"); here too });

Anybody have any thoughts on How can I implement this? Thanks!

PS - Btw I read the Previous similar questions doesn't seems to clear with those.

mcfinnigan · Accepted Answer · 2018-03-05 12:54:17Z

This seems like a good candidate for breaking up this lambda into two lambdas with some support code.

First lambda recieves request to 'A' and places a message onto SQS. It then returns to the caller the success status.
A separate process monitors the SQS queue and invokes a second Lambda on it when a message becomes available.

This has several benefits.

Firstly, you no longer have a long-running lambda waiting for a second system that may be down to return. Secondly, you're doing things asynchronously in the background.

Take a look at this blog post for an overview of how this could work in practice.

How about i can invoke another lambda function asynchronously using invocationType: Event does the same process in the background. I was wondering if it is an efficient way. Any thoughts would be much helpful

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