serverless.yml

service: aws-ruby-step-functions

frameworkVersion: '2'

provider:
  name: aws
  runtime: ruby2.7
  region: eu-west-1
  memorySize: 256
  lambdaHashingVersion: 20201221
  logRetentionInDays: 30
  iam:
    role:
      statements:
        - Effect: Allow
          Action:
            - ses:SendEmail
          Resource:
            - "arn:aws:ses:${self:provider.region}:*:*"
        - Effect: Allow
          Action:
            - dynamodb:PutItem
          Resource:
            - !GetAtt Table.Arn
functions:
  send-email:
    handler: src/handlers/send_email/handler.run
    environment:
      sender: ${self:custom.sender}
      recipient: ${self:custom.recipient}

plugins:
  - serverless-ruby-layer
  - serverless-step-functions

resources:
  Resources:
    Table:
      Type: AWS::DynamoDB::Table
      Properties:
        TableName: ${self:custom.tableName}
        Tags:
          - Key: Application
            Value: ${self:service}
          - Key: Stage
            Value: ${sls:stage}
        BillingMode: PAY_PER_REQUEST
        AttributeDefinitions:
          - AttributeName: id
            AttributeType: S
        KeySchema:
          - AttributeName: id
            KeyType: HASH
custom:
  StateMachineName: add-employee-and-send-email-state-machine-${sls:stage}
  tableName: ${self:service}-${sls:stage}
  sender: sender@email.com
  recipient: recipient@mail.com
  rubyLayer:
    include_functions:
      - send-email

stepFunctions:
  stateMachines:
    myStateMachine:
      type: EXPRESS
      name: ${self:custom.StateMachineName}
      events:
        - http:
            path: employees/add
            method: POST
      definition:
        StartAt: Save to DynamoDB
        States:
          Save to DynamoDB:
            Type: Task
            Resource: arn:aws:states:::dynamodb:putItem
            Parameters:
              TableName: ${self:custom.tableName}
              Item:
                id:
                  S.$: $.id
                JobTitle:
                  S.$: $.jobTitle
            Next: Is Save Successful
          Is Save Successful:
            Type: Choice
            Choices:
            - Variable: "$.SdkHttpMetadata.HttpStatusCode"
              NumericEquals: 200
              Next: SES notification
            Default: Fail Execution
          SES notification:
            Type: Task
            Resource:
              Fn::GetAtt: [send-email, Arn]
            Catch:
            - ErrorEquals: ["States.ALL"] 
              Next: Fail Execution
            Next: Success Execution
          Fail Execution:
            Type: Fail
          Success Execution:
            Type: Succeed
  validate: true