GRPC Server: Move reflection to a separate gRPC service (#55872)

pkg/services/grpcserver/reflection.go

@@ -0,0 +1,35 @@
+package grpcserver
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/setting"
+
+	"google.golang.org/grpc/reflection"
+	"google.golang.org/grpc/reflection/grpc_reflection_v1alpha"
+)
+
+// ReflectionService implements the gRPC Server Reflection Protocol:
+// https://github.com/grpc/grpc/blob/master/doc/server-reflection.md
+type ReflectionService struct {
+	cfg              *setting.Cfg
+	reflectionServer *reflectionServer
+}
+
+type reflectionServer struct {
+	grpc_reflection_v1alpha.ServerReflectionServer
+}
+
+// AuthFuncOverride no auth for reflection service.
+func (s *reflectionServer) AuthFuncOverride(ctx context.Context, _ string) (context.Context, error) {
+	return ctx, nil
+}
+
+func ProvideReflectionService(cfg *setting.Cfg, grpcServerProvider Provider) (*ReflectionService, error) {
+	re := &reflectionServer{reflection.NewServer(reflection.ServerOptions{Services: grpcServerProvider.GetServer()})}
+	grpc_reflection_v1alpha.RegisterServerReflectionServer(grpcServerProvider.GetServer(), re)
+	return &ReflectionService{
+		cfg:              cfg,
+		reflectionServer: re,
+	}, nil
+}