aws lambda: invoke function via other lambda function

Question

I have an AWS Lambda function, that need's ~ 30 seconds. When I connect it to the API Gateway, it's sending a 504 because of the 5 second timeout. So my easyCron Job is failing and will not try it again (I only have a free plan)

So I need an API, that sends a correct 200 status. My Idea:

Invoke the long term lambda via a short term lambda. The policy is allowing the invocation.

Here is the code

var AWS = require('aws-sdk'),

	params = {
		FunctionName: 'cctv',
		InvocationType: 'RequestResponse',
		LogType: 'Tail'
	},
	lambda;
AWS.config.update({region: 'us-east-1'});
lambda = new AWS.Lambda();

exports.handler = function (event, context) {
	'use strict';
	lambda.invoke(params, function (err, data) {
		if (err) {
			console.log(err, err.stack);
		}
		else {
			console.log(data);
		}
	});
	context.succeed('hey cron job, I think my lambda function is not called');

};

But I think, context.succeed() aborts the execution of lambda.invoke()

Do you have any idea how to solve this?

You're not actually calling the code that calls your Lambda function. You're defining a function to do the work into exports.handler, but that's not being called. — Matt Houser
This code is called by the API gateway. It's printing the succeed message, but it's not invoking the second lambda function 'cctv' — Christian Haller
Yes, because the code you listed above is not actually calling lambda.invoke. So your level 1 function is being called, but your level 1 function is not actually calling your level 2 function. — Matt Houser
I connected API Gateway with the first Lamba Function. It's calling the handler(). I thinks it's more or less this code: require('./index').handler({},{succeed:function(message){ console.log(message); },'error':function(){}}); So I guess lambda.invoke()should be called — Christian Haller

Mike76 Mike76 · Accepted Answer · 2015-09-25T20:09:22

This is incorrect

InvocationType: 'RequestResponse'

You should use

InvocationType: 'Event'

From http://docs.aws.amazon.com/lambda/latest/dg/API_Invoke.html#API_Invoke_RequestSyntax

By default, the Invoke API assumes "RequestResponse" invocation type. You can optionally request asynchronous execution by specifying "Event" as the InvocationType.

aws lambda: invoke function via other lambda function

2 Answers