Expose/deploy more than a single handler (quarkus-lambda)

user_2160748 0
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The documentation shows that the exposed handler (via io.quarkus.amazon.lambda.runtime.QuarkusStreamHandler::handleRequest in the packaged application) is configured by setting quarkus.lambda.handler in application.properties. However in my case I'd like to deploy multiple handlers from the same project.

Does anyone know of a way, or whether it's possible, to expose more than a single handler from a quarkus-lambda project?

Edit: After reading through https://github.com/quarkusio/quarkus/blob/master/extensions/amazon-lambda/runtime/src/main/java/io/quarkus/amazon/lambda/runtime/AmazonLambdaRecorder.java#L89 it seems that this is indeed not possible right now, is that correct?

quarkus aws-lambda
2 Answers

This is now possible by setting the QUARKUS_LAMBDA_HANDLER environment variable for each lambda function. This environment variable will override quarkus.lambda.handler in application.properties.

For instance, if you have multiple handlers defined as so:

    @Named("Test")
    public class TestLambda implements RequestHandler<InputObject, OutputObject> {

        @Inject
        ProcessingService service;

        @Override
        public OutputObject handleRequest(InputObject input, Context context) {
            return new OutputObject().setRequestId("1").setResult("Test");
        }

    }

    @Named("Sample")
    public class SampleLambda implements RequestHandler<InputObject, OutputObject> {

        @Inject
        ProcessingService service;

        @Override
        public OutputObject handleRequest(InputObject input, Context context) {
            return new OutputObject().setRequestId("2").setResult("Sample");
        }
    }

You could build the single project and deploy multiple functions with the following SAM template.

    AWSTemplateFormatVersion: '2010-09-09'
    Transform: AWS::Serverless-2016-10-31
    Description: AWS Serverless Quarkus - quarkus-amazon-lambda-common-deployment
    Globals:
      Api:
        EndpointConfiguration: REGIONAL
        BinaryMediaTypes:
          - "*/*"

    Resources:

      TestFunction:
        Type: AWS::Serverless::Function
        Properties:
          Handler: io.quarkus.amazon.lambda.runtime.QuarkusStreamHandler::handleRequest
          Runtime: java11
          CodeUri: target/function.zip
          MemorySize: 256
          Timeout: 15
          Policies: AWSLambdaBasicExecutionRole
          Environment:
            Variables:
              QUARKUS_LAMBDA_HANDLER: Test
          Events:
            TestFunction:
              Type: Api
              Properties:
                Path: /test
                Method: get


      SampleFunction:
        Type: AWS::Serverless::Function
        Properties:
          Handler: io.quarkus.amazon.lambda.runtime.QuarkusStreamHandler::handleRequest
          Runtime: java11
          CodeUri: target/function.zip
          MemorySize: 256
          Timeout: 15
          Policies: AWSLambdaBasicExecutionRole
          Environment:
            Variables:
              QUARKUS_LAMBDA_HANDLER: Sample
          Events:
            HelloWorld:
              Type: Api
              Properties:
                Path: /sample
                Method: get
user_14541230

You should just write a RestEasy Resource and then follow the steps written here:

https://quarkus.io/guides/amazon-lambda-http

For a full example with RestEasy & DynamoDB, read these:

Basically, the idea is that you just write Rest Resources in Quarkus and Quarkus deploys & configures all your Resource endpoints as Api-Gateways and Lambda's & Handlers in AWS via the SAM CLI.

Make sure you have these 2 dependencies in your classpath:

    <dependency>
        <groupId>software.amazon.awssdk</groupId>
        <artifactId>url-connection-client</artifactId>
    </dependency>
    <dependency>
        <groupId>io.quarkus</groupId>
        <artifactId>quarkus-amazon-lambda-http</artifactId>
    </dependency>

Then run: 

mvn clean install

To make sure that the necessary artifacts are created in your /target folder.

user_29793250
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