How to create a basic EventBridge in Serverless

Serverless Framework
,
1

Hi, I am trying to create a Simple AWS EventBridge on a Lambda Function, both of which are being created using Serverless Script.

Here is the code I am trying to use in serverless.yml (Some variables are unset) also handler.js is default

service: event-bridge-cloudformation

provider:
  name: aws
  runtime: nodejs10.x
  region: us-east-1

functions:
  hello:
    handler: handler.hello

resources:
 Resources:
    ScheduledRule: 
      Type: AWS::Events::Rule
      Properties: 
        Description: "ScheduledRule"
        ScheduleExpression: "rate(1 minutes)"
        State: "ENABLED"
        Targets: 
          - 
            Arn: 
              Fn::GetAtt: 
                - "arn:aws:lambda:${self:provider.region}:${self:provider.environment.AWS_ACCOUNT}:function:${self:service}-${self:provider.stage}-hello"
                - "Arn"

Above code is giving me following error:
Error: The CloudFormation template is invalid: Template error: instance of Fn::GetAtt references undefined resource

Can you please help me with some basic template in serverless that creates both lambda and an EventBridge on that Lambda

Thanks.

2

Looks like you’re trying to get an Arn from an Arn. That is, you’re constructing the arn as a string, then trying to get the arn from that string. Here’s 2 potential solutions to your issue:

  1. Construct the Arn as a string:
Targets:
  - 
    Arn: "arn:aws:lambda:${self:provider.region}:${self:provider.environment.AWS_ACCOUNT}:function:${self:service}-${self:provider.stage}-hello"
  1. Get the Arn from the LogicalId of the Hello Function
Targets:
  - 
    Arn:
        Fn::GetAtt: 
          - "HelloLambdaFunction"
          - "Arn"

Hope it helps.

1 Like
3

Thanks Brett, it helped :slight_smile:

1 Like