template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Simple implementation of a microservice to query and insert data in DynamoDB Database
Globals:
  Function:
    Runtime: nodejs18.x
    Timeout: 3
    Environment:
      Variables:
        TABLE: !Ref DeviceServiceTable        

Parameters:
  Service:
    Type: String
    Description: The name of the service
  Stage:
    Type: String
    Description: The stage name for deployment
  S3BucketName:
    Type: String
    Description: The S3 Bucket name for the artifacts
  ReadCapacity:
    Type: Number
    Default: 1
    Description: The ReadCapacityUnits value
  WriteCapacity:
    Type: Number
    Default: 1
    Description: The WriteCapacityUnits value  

Resources:

  DeviceServiceApi:
    Type: AWS::Serverless::Api
    Properties:
      StageName: !Ref Stage      
      DefinitionBody:
          'Fn::Transform':
            Name: 'AWS::Include'
            Parameters:
              Location: !Join [ '', [ !Ref S3BucketName, '/swagger.yaml'  ] ]
              
  GetDeviceListFunction:
    Type: AWS::Serverless::Function    
    Properties:
      CodeUri: src/functions/list-devices/
      Handler: index.handler
      Timeout: 10 # Scan may need longer processing time
      FunctionName: !Join [ '-', [ !Ref Service, 'list-devices' ] ]
      Policies:
        - DynamoDBReadPolicy:
            TableName: !Ref DeviceServiceTable      
     
  GetDeviceListFunctionPermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName: !Ref GetDeviceListFunction
      Principal: apigateway.amazonaws.com

  GetDeviceFunction:
    Type: AWS::Serverless::Function    
    Properties:
      CodeUri: src/functions/get-device/
      Handler: index.handler
      FunctionName: !Join [ '-', [ !Ref Service, 'get-device' ] ]
      Policies:
        - DynamoDBReadPolicy:
            TableName: !Ref DeviceServiceTable        
     
  GetDeviceFunctionPermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName: !Ref GetDeviceFunction
      Principal: apigateway.amazonaws.com

  PostOrPutDeviceFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/functions/post-or-put-device
      Handler: index.handler
      FunctionName: !Join [ '-', [ !Ref Service, 'create-or-update-device' ] ]
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref DeviceServiceTable

  PostOrPutDeviceFunctionPermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName: !Ref PostOrPutDeviceFunction
      Principal: apigateway.amazonaws.com

  DeviceServiceTable:
    Type: "AWS::DynamoDB::Table"
    Properties:
      TableName: !Sub '${Service}-table'      
      AttributeDefinitions:
        - AttributeName: "deviceId"
          AttributeType: "S"        
      KeySchema:
        - AttributeName: "deviceId"
          KeyType: "HASH"
      ProvisionedThroughput:
        ReadCapacityUnits: !Ref ReadCapacity
        WriteCapacityUnits: !Ref WriteCapacity
      PointInTimeRecoverySpecification:
        PointInTimeRecoveryEnabled: true