template.yaml

AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: >
  sfn-apigw-example

  Sample SAM Template for sfn-apigw-example

Parameters: 
  BuyPath: 
    Type: String
    Default: /buy
  SellPath: 
    Type: String
    Default: /sell
  CheckPath: 
    Type: String
    Default: /check

Resources:
  StockTradingStateMachine:
    Type: AWS::Serverless::StateMachine # More info about State Machine Resource: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-statemachine.html
    Properties:
      DefinitionUri: statemachine/stock_trader.asl.json
      DefinitionSubstitutions:
        StockCheckPath: !Ref CheckPath
        StockSellPath: !Ref SellPath
        StockBuyPath: !Ref BuyPath
        APIEndPoint: !Sub "${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com"
        DDBPutItem: !Sub arn:${AWS::Partition}:states:::dynamodb:putItem
        DDBTable: !Ref TransactionTable
      Events:
        HourlyTradingSchedule:
          Type: Schedule # More info about Schedule Event Source: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-property-statemachine-schedule.html
          Properties:
            Description: Schedule to run the stock trading state machine every hour
            Enabled: False # This schedule is disabled by default to avoid incurring charges.
            Schedule: "rate(1 hour)"
      Policies: # Find out more about SAM policy templates: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-policy-templates.html
        - LambdaInvokePolicy:
            FunctionName: !Ref StockCheckerFunction
        - LambdaInvokePolicy:
            FunctionName: !Ref StockSellerFunction
        - LambdaInvokePolicy:
            FunctionName: !Ref StockBuyerFunction
        - DynamoDBWritePolicy:
            TableName: !Ref TransactionTable

  StockCheckerFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-function.html
    Properties:
      CodeUri: functions/stock-checker/
      Handler: app.lambdaHandler
      Runtime: nodejs14.x
      Events:
        Api:
          Type: Api
          Properties:
            Path: /check
            Method: GET

  StockSellerFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: functions/stock-seller/
      Handler: app.lambdaHandler
      Runtime: nodejs14.x
      Events:
        Api:
          Type: Api
          Properties:
            Path: /sell
            Method: POST

  StockBuyerFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: functions/stock-buyer/
      Handler: app.lambdaHandler
      Runtime: nodejs14.x
      Events:
        Api:
          Type: Api
          Properties:
            Path: /buy
            Method: POST

  TransactionTable:
    Type: AWS::Serverless::SimpleTable # More info about SimpleTable Resource: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-simpletable.html
    Properties:
      PrimaryKey:
        Name: Id
        Type: String
      ProvisionedThroughput:
        ReadCapacityUnits: 1
        WriteCapacityUnits: 1

Outputs:
  # StockTradingStateMachineHourlyTradingSchedule is an implicit Schedule event rule created out of Events key under Serverless::StateMachine
  # Find out more about other implicit resources you can reference within SAM
  # https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-specification-generated-resources.html
  StockTradingStateMachineArn:
    Description: "Stock Trading state machine ARN"
    Value: !Ref StockTradingStateMachine
  StockTradingStateMachineRole:
    Description: "IAM Role created for Stock Trading state machine based on the specified SAM Policy Templates"
    Value: !GetAtt StockTradingStateMachineRole.Arn
  WebEndpoint:
    Description: "API Gateway endpoint URL for Prod stage"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/"