execution_counter_lambda_template.yml

AWSTemplateFormatVersion: "2010-09-09"
Description: "An example lambda template to demonstrate persistent state between executions"
Resources:
  LambdaExecutionRole:
    Type: "AWS::IAM::Role"
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: "sts:AssumeRole"

  countExecutionLambda:
    Type: "AWS::Lambda::Function"
    Properties:
      Handler: "index.handler"
      Role: !GetAtt [ LambdaExecutionRole, Arn ]
      Code:
        ZipFile: |
          let executionCounter = 0
          exports.handler = function(event, context) {
            executionCounter++
            console.log(`Number of execution: ${executionCounter}`)
            return 'okay'
          }
      Runtime: "nodejs8.10"
      Timeout: "25"
      MemorySize: 128