AWS Cloudwatch Event putTargets not adding Lambda event sources

Question

I am making a call to aws cloudWatchEvent putRule & PutTarget api through aws sdk to create a cloudWatch Rule and attach a target to it. My Target is a lambda function, the rule gets created, the target gets attached to the rule but when the rule triggers based on its schedule the target lambda function not trigger. So I looked further and found out that the event source under the lambda function is not added which makes it not trigger. If I create the rule and target through AWS console the event source gets created and everything works but not thorugh API.

Answer 1

I had same issue here, and i solve this by what @Anvita Shukla has sugested.

This worked fine when i do:

• create the lambda (this i was created in web page)

And with SDK

• create the rule object
• create the target object
• put request of the rule
• put request of the target
• get response object of rule request to retrieve the rule ARN
• create permission object (has @Anvita Shukla said) and set the rule ARN
• add permission by lambda client object

In the aws lambda page i can see my lambdas with associated triggers events. And in aws cloudwatch events page i can see the created rules. I wrote this in java lang. If you want i can share the code.

Answer 2

I fixed it. You need to add permission for lambda with SourceArn is cloud watch after putTargets. For example :

var lambdaPermission = {
        FunctionName: 'cloudwatch-trigger',
        StatementId : timestamp.toString(),
        Action: 'lambda:InvokeFunction',
        Principal: 'events.amazonaws.com', 
        SourceArn: 'arn:aws:events:ap-southeast-1:XXXXXX:rule/schedule_auto_1'
    };

    lambda.addPermission(lambdaPermission, function(err, data) {
        if (err) {
            console.log("Error", err);
        } else {
            console.log("Success", data);
            console.log("add permisson done");
        }
    });