Suspendable ServerRequestFilter in Resteasy Reactive

[mschorsch]

Description

The following return types are currently possible in Resteasy Reactive Filters (@ServerRequestFilter): void, Response, RestResponse, Optional<Response>, Optional<RestResponse>, Uni <Void>, Uni<RestResponse> or Uni <Response>.

Please add support for suspendable filters (Kotlin Coroutines).

Example

class Filters {

    @ServerRequestFilter(preMatching = true)
    suspend fun preMatchingFilter(requestContext: ContainerRequestContext): RestResponse<String>? {
        return if (requestContext.method == HttpMethod.GET) {
            RestResponse.ok("GET", MediaType.TEXT_PLAIN_TYPE)
        } else {
            null
        }
    }
}

Implementation ideas

No response

[quarkus-bot]

/cc @FroMage, @evanchooly, @geoand, @stuartwdouglas

[geoand]

This is certainly interesting (and I'll likely implement it for Quarkus 2.3), but may I ask what you plan to do in the filter that requires it to be a suspending function?

[mschorsch]

I am planning to call a suspend function in a service. The suspend function in the service makes an asynchronous request (a database call or a rest request).

In addition, it is already possible to return a Uni, so it would make sense to support Deferred as well.

Maybe it would be a good idea to support suspendable functions where Uni is already supported in Resteasy Reactive?

[geoand]

Yeah, we can certainly do that. But it will likely be a 2.3 enhancement, not a 2.2 one

[mschorsch]

@geoand Ist there any chance that this will be in 2.4?

[geoand]

I'd say chances are slim, but it could happen.

[geoand]

#20529 introduces this feature