template.yaml

# This is the SAM template that represents the architecture of your serverless application
# https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-template-basics.html

# The AWSTemplateFormatVersion identifies the capabilities of the template
# https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/format-version-structure.html
AWSTemplateFormatVersion: 2010-09-09
Description: >-
  highscores-aws

# Transform section specifies one or more macros that AWS CloudFormation uses to process your template
# https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/transform-section-structure.html
Transform:
  - AWS::Serverless-2016-10-31

# Resources declares the AWS resources that you want to include in the stack
# https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/resources-section-structure.html
Resources:
  # Each Lambda function is defined by properties:
  # https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction

  # This is a Lambda function config associated with the source code: put-item.js
  SaveScoreFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/handlers/saveScoreHandler.saveScoreHandler
      Runtime: nodejs18.x
      Architectures:
        - x86_64
      MemorySize: 128
      Timeout: 100
      Description: HTTP post method to add one item to a DynamoDB table.
      Policies:
        # Give Create/Read/Update/Delete Permissions to the HIGHSCORE_TABLE
        - DynamoDBCrudPolicy:
            TableName: !Ref HighscoresTable
      Environment:
        Variables:
          # Make table name accessible as environment variable from function code during execution
          HIGHSCORE_TABLE: !Ref HighscoresTable
      Events:
        Api:
          Type: Api
          Properties:
            Path: /
            Method: POST

  GetLeaderboardFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/handlers/getLeaderboardHandler.getleaderboardHandler
      Runtime: nodejs18.x
      Architectures:
        - x86_64
      MemorySize: 128
      Timeout: 100
      Description: HTTP get method to get all items from a DynamoDB table.
      Policies:
        # Give Read Permissions to the HIGHSCORE_TABLE
        - DynamoDBReadPolicy:
            TableName: !Ref HighscoresTable
      Environment:
        Variables:
          # Make table name accessible as environment variable from function code during execution
          HIGHSCORE_TABLE: !Ref HighscoresTable
      Events:
        Api:
          Type: Api
          Properties:
            Path: /
            Method: GET

  # Simple syntax to create a DynamoDB table with a single attribute primary key, more in
  # https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlesssimpletable

  # DynamoDB table to store item: {id: <ID>, name: <NAME>}
  HighscoresTable:
    Type: AWS::Serverless::SimpleTable
    Properties:
      PrimaryKey:
        Name: id
        Type: String
      ProvisionedThroughput:
        ReadCapacityUnits: 1
        WriteCapacityUnits: 1

Outputs:
  WebEndpoint:
    Description: "API Gateway endpoint URL for Prod stage"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/"