template.yml

# 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: >-
  aws-sam-typescript-layers-example

# 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

Globals:
  Function:
    Layers:
      - !Ref RuntimeDependenciesLayer
    Environment:
      Variables:
        SAMPLE_TABLE: !Ref SampleTable
        ITEM_QUEUE: !Ref WriteQueue
    Runtime: nodejs18.x
    MemorySize: 128
    Timeout: 100

# 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: get-all-items.js
  getAllItemsFunction:
    Type: AWS::Serverless::Function
    Metadata:
      BuildMethod: makefile
    Properties:
      Handler: dist/handlers/get-all-items.getAllItemsHandler
      Description: A simple example includes a HTTP get method to get all items from a DynamoDB table.
      Policies:
        # Give Create/Read/Update/Delete Permissions to the SampleTable
        - DynamoDBCrudPolicy:
            TableName: !Ref SampleTable
      Events:
        Api:
          Type: Api
          Properties:
            Path: /
            Method: GET
  # 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: get-by-id.js
  getByIdFunction:
    Type: AWS::Serverless::Function
    Metadata:
      BuildMethod: makefile
    Properties:
      Handler: dist/handlers/get-by-id.getByIdHandler
      Description: A simple example includes a HTTP get method to get one item by id from a DynamoDB table.
      Policies:
        # Give Create/Read/Update/Delete Permissions to the SampleTable
        - DynamoDBCrudPolicy:
            TableName: !Ref SampleTable
      Events:
        Api:
          Type: Api
          Properties:
            Path: /{id}
            Method: GET
  # 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
  putItemFunction:
    Type: AWS::Serverless::Function
    Metadata:
      BuildMethod: makefile
    Properties:
      Handler: dist/handlers/put-item.putItemHandler
      Description: A simple example includes a HTTP post method to add one item to an SQS queue (to be written to a DynamoDB table later).
      Policies:
        # Give permission to send message to an Amazon SQS queue. See https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-policy-template-list.html#sqs-send-message-policy
        - SQSSendMessagePolicy:
            QueueName: !GetAtt WriteQueue.QueueName
      Events:
        Api:
          Type: Api
          Properties:
            Path: /
            Method: POST

  # This is a Lambda function config associated with the source code: write-item.ts
  writeItemFunction:
    Type: AWS::Serverless::Function
    Metadata:
      BuildMethod: makefile
    Properties:
      Handler: dist/handlers/write-item.writeItemHandler
      Description: A simple example includes an SQS subscription to write queued object to DynamoDB
      Timeout: 25 # Chosen to be less than the default SQS Visibility Timeout of 30 seconds
      Policies:
        # Give Create/Read/Update/Delete Permissions to the SampleTable, see https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-policy-template-list.html#dynamo-db-crud-policy
        - DynamoDBCrudPolicy:
            TableName: !Ref SampleTable
      Events:
        # Subscription to primary SQS queue
        SQSQueueEvent:
          Type: SQS
          Properties:
            Queue: !GetAtt WriteQueue.Arn
            BatchSize: 1

  # 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>}
  SampleTable:
    Type: AWS::Serverless::SimpleTable
    Properties:
      PrimaryKey:
        Name: id
        Type: String
      ProvisionedThroughput:
        ReadCapacityUnits: 2
        WriteCapacityUnits: 2

  WriteQueue:
    Type: AWS::SQS::Queue

  RuntimeDependenciesLayer:
    Type: AWS::Serverless::LayerVersion
    Metadata:
      BuildMethod: makefile
    Properties:
      Description: Runtime dependencies for Lambdas
      ContentUri: ./
      CompatibleRuntimes:
        - nodejs18.x
      RetentionPolicy: Retain

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