Added gzip compression feature for SmallRye-GraphQL, added tests

[mskacelik]

/cc @jmartisk @mkouba
fixes: #21642

The one thing I am not sure about is this line of code: https://github.com/mskacelik/quarkus/blob/110e460ca5f5e468e9ce3811daa79620cc2576ee/extensions/smallrye-graphql/runtime/src/main/java/io/quarkus/smallrye/graphql/runtime/SmallRyeGraphQLCompressionHandler.java#L17

Here I use addHeadersEndHandler instend of addEndHandler. The reason is because SmallRyeGraphQLAbstractHandler rewrites the endHandler for the ExecutionHandler.

[mkouba]

The one thing I am not sure about is this line of code: https://github.com/mskacelik/quarkus/blob/110e460ca5f5e468e9ce3811daa79620cc2576ee/extensions/smallrye-graphql/runtime/src/main/java/io/quarkus/smallrye/graphql/runtime/SmallRyeGraphQLCompressionHandler.java#L17

Here I use addHeadersEndHandler instend of addEndHandler. The reason is because SmallRyeGraphQLAbstractHandler rewrites the endHandler for the ExecutionHandler.

I wonder if it would make more sense to change the logic in the SmallRyeGraphQLAbstractHandler.handle() method to use RoutingContext.addEndHandler() instead 🤷 .

[mskacelik]

I wonder if it would make more sense to change the logic in the SmallRyeGraphQLAbstractHandler.handle() method to use RoutingContext.addEndHandler() instead 🤷 .

I tried it once, but unfortunately it had no effect. But I'll try it again, with a little more in-depth look into it.

[quarkus-bot]

✔️ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

[mskacelik]

Ok, I have tried it again and it once again had no effect. Funny enough, while I commented out the ctx.response()... lines of code in the SmallRyeGraphQLAbstractHandler:

//        ctx.response()
//                .endHandler(currentManagedContextTerminationHandler)
//                .exceptionHandler(currentManagedContextExceptionHandler)
//                .closeHandler(currentManagedContextTerminationHandler);

And at the same time having the context.addEndHandler in the SmallRyeGraphQLCompressionHandler did not fix the issue. So it is probably not the cause of this problem. 🤔

[mkouba]

FTR the addEndHandler() was probably a bad idea; it shouldn't be used in this case. There's a proposal to fix the support for some extensions: #35804. Let's wait until that fix is approved.

[geoand]

FYI, #35804 is now in