template.yml

AWSTemplateFormatVersion: 2010-09-09
Transform:
- AWS::Serverless-2016-10-31

Parameters:
  ProjectId:
    Type: String
    Description: AWS projectID to be used to associate ressources.

  VpcId:
    Type: AWS::EC2::VPC::Id
    Description: VPC id.
  
  VpcSecurityGroupIds:
    Type: List<AWS::EC2::SecurityGroup::Id>
    Description: VPC security groups ids.
  
  VpcSubnetIds:
    Type: List<AWS::EC2::Subnet::Id>
    Description: VPC subnet ids.

Resources:
  EcsServiceDiscoverySchedule: 
    Type: "AWS::Events::Rule"
    Properties: 
      Description: "ScheduledRule"
      ScheduleExpression: "rate(2 minutes)"
      State: "ENABLED"
      Targets: 
        - 
          Arn: !GetAtt EcsServiceDiscovery.Arn
          Id: !Join ['-', [!Ref 'ProjectId', 'ecs-service-discovery']]

  PermissionForEventsToInvokeLambda: 
    Type: "AWS::Lambda::Permission"
    Properties: 
      FunctionName: !Ref EcsServiceDiscovery
      Action: "lambda:InvokeFunction"
      Principal: "events.amazonaws.com"
      SourceArn: !GetAtt EcsServiceDiscoverySchedule.Arn

  EcsServiceDiscovery:
    Type: AWS::Serverless::Function
    Properties:
      Handler: main
      Runtime: go1.x
      Environment: 
        Variables:
          PROJECT_ID: !Ref 'ProjectId'
      VpcConfig:
        SecurityGroupIds: !Ref 'VpcSecurityGroupIds'
        SubnetIds: !Ref 'VpcSubnetIds'
      Role:
        Fn::ImportValue:
          !Join ['-', [!Ref 'ProjectId', !Ref 'AWS::Region', 'LambdaTrustRole']]