HTTP Server runtime based on Java built-in HTTP Server

[sdelamo]

Micronaut HTTP Server Module

This pull request adds a HTTP Server implementation based on the Java built-in HTTP Server. To use it, users need to add the following dependency:

io.micronaut.servlet:micronaut-http-server.

For users, it would probably be best to use something more battled tested like netty or any of the servlet implementations as their runtime. Still, it is pretty cool to be able to have a Micronaut application with both a server and a client based on the built-in Java HTTP server and HTTP client while keeping your Micronaut Application with the same Micronaut APIs.

Micronaut HTTP Server Module Implementation.

To power it, I created a new module that depends on servlet-engine. It leverages the API ServletHttpHandler<HttpServletRequest, HttpServletResponse> to implement a com.sun.net.httpserver.HttpHandler.

I created implementations of HttpServletRequest and HttpServletResponse to interact with com.sun.net.httpserver.HttpExchange. Although, I have left many methods with throw new UnsupportedOperationException("Not implemented");, the TCK passes fully but for one test which fails for every other Servlet implementation.

Consuming Java built-in HTTP Server runtime in function test modules

I have created hooks so that the serverless test modules (gcp , azure, and aws) can be powered by the built-in Java http server runtime without relying on servlet-runtime. Instead, they will provide their own implementation of HttpHandler based on the function and they will exposes the function`s application context as the server application context.

The following draft PR shows the implementation in the AWS module:

micronaut-projects/micronaut-aws#2315

This will allow us to stop relying on Jetty 11, which has an opened CVE, in all those modules.

Files Moves

QueryStringDecoder

I copied QueryStringDecoder from http-poja-common and package io.micronaut.http.poja.util.QueryStringDecoder into servlet-core and package io.micronaut.servlet.http.utils. I have deprecated from removal io.micronaut.http.poja.util.QueryStringDecoder

Server Classes

I have copied the server classes (ServletServerFactory, ServletStaticResourceConfiguration, and AbstractServletServer) from server-runtime into server-core. I have deprecated, for removal, these classes in the server-runtime module.

Event Publication

• AbstractServletServer publishes only ServerShutDown if there is a bean of type ApplicationEventPublisher<ServerShutdownEvent>
• I made discovery-client a compile-only dependency. I created a listener of ServerStartupEvent which publishes ServiceReadyEvent.

[yawkat]

Why do the buffering to byte[] and not just directly write to the response body stream?

[graemerocher]

wouldn't it be easier to implement Micronaut's HTTP request interface instead of trying to create a servlet bridge?

[sonarqubecloud]

Quality Gate failed

Failed conditions
57.7% Coverage on New Code (required ≥ 70%)
1 New Bugs (required ≤ 0)
3 New Critical Issues (required ≤ 0)

See analysis details on SonarQube Cloud

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