Sam template rest api, Can we have separate handler for each function event type?

Question

Is it possible to have separate handler for one function but each event type.

For example.

    Type: AWS::Serverless::Function
    Properties:
      FunctionName: ecommerce-lambda
      Handler: src/handlers/ecommerceHandler.handler.   <--- HERE is one handler for all event type below. 
      Runtime: nodejs12.x
      Description: Products Lambda function.
      Policies:
        - AWSLambdaBasicExecutionRole
        - AmazonDynamoDBFullAccess
      Environment:
        Variables:
          LAMBDA_ENVIRONMENT: local
      Events:
        # Products
        GetProductsAPI:    <---- Can this be some other handler?
          Type: Api
          Properties:
            Path: /api/products
            Method: GET
        PostProductsAPI:    <---- Can this be some other handler?
          Type: Api
          Properties:
            Path: /api/products
            Method: POST

Given that I dont want to do following.

Resources:
  ApiResource:
    Type: AWS::Serverless::Api
    Properties:
      StageName: prod  
  
  TimeFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: firstsample/firstsample.handler   # firstsample.js file is in firstsample direcotory
      Role: !GetAtt BasicAWSLambdaRole.Arn
      Runtime: nodejs6.10
      CodeUri: ./                          # Look for code in the same directory as the output SAM file
      Events:
        MyTimeApi:
          Type: Api
          Properties:
            Path: /TimeResource
            Method: GET
            RestApiId: !Ref ApiResource
  
  SecondSampleFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: secondsample.handler                  # didn't have to include secondsample directory
      Role: !GetAtt BasicAWSLambdaRole.Arn
      Runtime: nodejs6.10
      CodeUri: ./secondsample           # code is in the secondsample directory, located in same directory
      Events:
        MyTimeApi:
          Type: Api
          Properties:
            Path: /TextResource
            Method: GET
            RestApiId: !Ref ApiResource

I want the setup where I want to each endpoint to be handle by its own lambda. GET should have its own lambda, POST should have its own lambda.

Guy · Answer 1 · 2023-05-06T20:13:33.430

You can define two separated functions with different handlers with a common path, one with a GET method and the second with the POST method.

for example:

myGetFunction:
  Type: AWS::Serverless::Function
  Properties:
    Handler: src/handlers/get-all-items.getAllItemsHandler
    Description: A simple example includes a HTTP get method to get all items
    Events:
      Api:
        Type: Api
        Properties:
          Path: /
          Method: GET

myPostFunction:
  Type: AWS::Serverless::Function
  Properties:
    Handler: src/handlers/put-item.putItemHandler
    Description: A simple example includes a HTTP post method to add item
    Events:
      Api:
        Type: Api
        Properties:
          Path: /
          Method: POST

Sam template rest api, Can we have separate handler for each function event type?

1 Answers1