AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  goad redux
  
  Inspired by https://goad.io/ this focuses purely on load generation from a single lambda.
  For purposes of observability it creates cloudformation metrics. You can enable:
    * 1 minute resolution via Cloudwatch Embedded Metrics format
    * 1 second resolution via Cloudwatch PutMetrics API call

Parameters:
  Enable1mMetrics:
    Type: String
    Default: "false"
    AllowedValues: ["true", "false"]
    Description: "Enable Cloudwatch Metrics via EMF with 1 minute resolution [true/false]"
  Enable1sMetrics:
    Type: String
    Default: "true"
    AllowedValues: ["true", "false"]
    Description: "Enable Cloudwatch Metrics via PutMetrics with 1 second resolution [true/false]"

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 900
    MemorySize: 1024

Resources:
  # HelloWorldFunction:
  #   Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
  #   Properties:
  #     CodeUri: hello-world/
  #     Handler: hello-world
  #     Runtime: go1.x
  #     Tracing: Active # https://docs.aws.amazon.com/lambda/latest/dg/lambda-x-ray.html
  #     Events:
  #       CatchAll:
  #         Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
  #         Properties:
  #           Path: /hello
  #           Method: GET
  #     Environment: # More info about Env Vars: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#environment-object
  #       Variables:
  #         PARAM1: VALUE

  LoadGenerator:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: load-gen/
      Handler: load-gen
      Runtime: go1.x
      Tracing: Active # https://docs.aws.amazon.com/lambda/latest/dg/lambda-x-ray.html
      Environment:
        Variables:
          USE_PUT_METRICS: !Ref Enable1sMetrics
          USE_LOG_METRICS: !Ref Enable1mMetrics
      Policies:
        - Statement:
          - Sid: AllowPutMetrics
            Effect: Allow
            Action: cloudwatch:PutMetricData
            Resource: '*'
            
Outputs:
  # ServerlessRestApi is an implicit API created out of Events key under Serverless::Function
  # Find out more about other implicit resources you can reference within SAM
  # https://github.com/awslabs/serverless-application-model/blob/master/docs/internals/generated_resources.rst#api
  # HelloWorldAPI:
  #   Description: "API Gateway endpoint URL for Prod environment for First Function"
  #   Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/load_gen/"
  # HelloWorldFunction:
  #   Description: "First Lambda Function ARN"
  #   Value: !GetAtt HelloWorldFunction.Arn
  # HelloWorldFunctionIamRole:
  #   Description: "Implicit IAM Role created for Hello World function"
  #   Value: !GetAtt HelloWorldFunctionRole.Arn
  LoadGenArn:
    Description: ARN of load generator lambda function
    Value: !GetAtt LoadGenerator.Arn
    Export: 
      Name: !Sub "${AWS::StackName}-LoadGenArn"
  LoadGenName:
    Description: ARN of load generator lambda function
    Value: !Ref LoadGenerator
    Export: 
      Name: !Sub "${AWS::StackName}-LoadGenName"