template.yaml

# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: SAM Template for apigw-lambda-dynamodb

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 30

Resources:

  # DynamoDB Resource https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-dynamodb-table.html
  
  # This single-table DynamoDB design has a generic Partition Key (PK) and Sort Key (RK), and the item fields
  # are dependent on the item type:
  #  "Person Name Items"  :  PK = {id}, SK = "NAME#", data = "Person's Name"
  #  "Hello Message Items" :  PK = {id}, SK = "DT#{datetime}", data = "Hello Message"

  DynamoDBTable:
    Type: AWS::DynamoDB::Table
    UpdateReplacePolicy: Delete
    Properties:
      AttributeDefinitions:
      - AttributeName: PK
        AttributeType: S
      - AttributeName: SK
        AttributeType: S
      KeySchema:
      - AttributeName: PK
        KeyType: HASH
      - AttributeName: SK
        KeyType: RANGE
      BillingMode: PAY_PER_REQUEST
      SSESpecification:
        SSEEnabled: true
    Metadata:
      SamResourceId: DynamoDBTable

 # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
 # The Lambda function supports the /hello/{id} endpoint
 # The function looks up the name of the person based on id, records the message to DynamoDB, 
 # and returns a customized hello message.

  PythonTestDemo:
    Type: AWS::Serverless::Function 
    Properties:
      Tracing: Active
      # Available policies: 
      # https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-policy-template-list.html
      Policies:
        - AWSXrayWriteOnlyAccess
        - DynamoDBCrudPolicy:
            TableName: !Ref DynamoDBTable
      CodeUri: src/
      Handler: app.lambda_handler
      Runtime: python3.9
      Architectures:
        - x86_64
      Environment:
        Variables:
          DYNAMODB_TABLE_NAME:
            Ref: DynamoDBTable
      Events:
        HelloPerson:
          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/{id}
            Method: get


    
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
  HelloPersonApi:
    Description: "API Gateway endpoint URL for Prod stage for Hello Person function"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/{id}"
  PythonTestDemo:
    Description: "Hello Person Lambda Function ARN"
    Value: !GetAtt PythonTestDemo.Arn
  DynamoDBTableName:
    Description: "Hello Person DynamoDB table name"
    Value: !Ref DynamoDBTable
  PythonTestDemoIamRole:
    Description: "Implicit IAM Role created for Hello World function"
    Value: !GetAtt PythonTestDemoRole.Arn