@johanbrandhorst, thank you for review!
I've added example files with generated code and mention of editions support and opaque API in README.

Protolint is failing because the new file isn't formatted, run buf format -w. The gorelease job is failing because of an issue with a dependency, rebase on main to fix it.

@johanbrandhorst, I’ve fixed the formatting and resolved most of the Bazel build errors. However, one issue remains — it’s caused by the opaque.proto examples requiring different compilation settings. I’m not very familiar with Bazel, so I’d really appreciate your help in resolving this.

Oh boy, Bazel isn't my strong suite either unfortunately. It seems like the error we're seeing is

opaque.pb.gw.go:53:28: cannot use runtime.String(val) (value of type string) as *string value in assignment

So the problem is probably setting the right generator options for protoc-gen-go. I don't really know what we need to do here, but I'll CC @AlejoAsd who I know has some Bazel skills :)

@johanbrandhorst @kop seems like you need to pass use_opaque_api to the go_proto_compiler in ./BUILD.bazel here, under options: https://github.com/kop/grpc-gateway/blob/1167ac0c21585be992a45b393e7845a6f732d8f1/BUILD.bazel#L56-L70

I'd assume you don't want to use the Opaque API for all protos in the repository, but scoped to the example folder you touched right?

If so, maybe it'd be a good idea to create a new go_proto_compiler in ./BUILD.bazel like so:

go_proto_compiler(
    name = "go_grpc_use_opaque_api",
    options = [
        "paths=source_relative",
        "require_unimplemented_servers=false",
        "use_opaque_api=true", # The relevant change
    ],
    plugin = "@org_golang_google_grpc_cmd_protoc_gen_go_grpc//:protoc-gen-go-grpc",
    suffix = "_grpc.pb.go",
    visibility = ["//visibility:public"],
    deps = PROTO_RUNTIME_DEPS + [
        "@org_golang_google_grpc//:go_default_library",
        "@org_golang_google_grpc//codes:go_default_library",
        "@org_golang_google_grpc//status:go_default_library",
    ],
)

And then update the go_proto_library target in examples/internal/proto/examplepb/BUILD.bazel to use the new compiler:

<         "//:go_grpc",
---
>         "//:go_grpc_use_opaque_api",
168c168

Thanks a lot for your input!

I'd assume you don't want to use the Opaque API for all protos in the repository, but scoped to the example folder you touched right?

Yes, ideally. We might even want to scope it less than that tbh, maybe only the file we're using here. I'd have to dig in a bit more and unfortunately I don't have time right now, but this might be good enough for someone to start on this!