feat: add mux middlewares and inject http pattern

[nikitaksv]

References to other Issues or PRs

Issue #4319

Have you read the Contributing Guidelines?

Yes

Brief description of what is fixed or changed

Added Middleware for ServerMux
Added the option of passing a HTTP Pattern to the request context

Other comments

Our team encountered a problem that middleware can only be applied to the Mux "http.Handler", which is unsafe for our application. Middleware is triggered regardless of whether a route exists or not, which leads to unnecessary triggering of middlewares. Also in http.Handler middleware there is no way except "defer" to get http pattern, so we added an option to pass HttpPattern in the request context before triggering middlewares.

[johanbrandhorst]

Hi, thanks for your PR. However, please open an issue to discuss the problem you're having before submitting a PR. I'm not convinced this is functionality we want, so please open a PR to discuss your specific problem first. Thanks!

[johanbrandhorst]

OK, I'm happy to go ahead with this feature. I would request that you update the comment on the generated direct-to-implementation registration functions in template.go:

grpc-gateway/protoc-gen-grpc-gateway/internal/gengateway/template.go

Lines 704 to 706 in 33ca56e

	// Note: the gRPC framework executes interceptors within the gRPC handler. If the passed in "{{$svc.InstanceName}}Client"
	// doesn't go through the normal gRPC flow (creating a gRPC client etc.) then it will be up to the passed in
	// "{{$svc.InstanceName}}Client" to call the correct interceptors.

to nudge people towards the use of this middleware functionality as an alternative to gRPC interceptors.

[johanbrandhorst]

LGTM!

[johanbrandhorst]

Looks like we need to regenerate the files after the update?

[nikitaksv]

Looks like we need to regenerate the files after the update?

It is not possible to regenerate files. Inside make generate, buf build is used, which has blocked its server for my country :(
Could you restore the files yourself?