snapshot of https://github.com/grpc/grpc-go.git (master, 2026-09-15; blobs > 131072B omitted)

internal/admin/admin.go

@@ -0,0 +1,60 @@
+/*
+ *
+ * Copyright 2021 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package admin contains internal implementation for admin service.
+package admin
+
+import "google.golang.org/grpc"
+
+// services is a map from name to service register functions.
+var services []func(grpc.ServiceRegistrar) (func(), error)
+
+// AddService adds a service to the list of admin services.
+//
+// NOTE: this function must only be called during initialization time (i.e. in
+// an init() function), and is not thread-safe.
+//
+// If multiple services with the same service name are added (e.g. two services
+// for `grpc.channelz.v1.Channelz`), the server will panic on `Register()`.
+func AddService(f func(grpc.ServiceRegistrar) (func(), error)) {
+	services = append(services, f)
+}
+
+// Register registers the set of admin services to the given server.
+func Register(s grpc.ServiceRegistrar) (cleanup func(), _ error) {
+	var cleanups []func()
+	for _, f := range services {
+		cleanup, err := f(s)
+		if err != nil {
+			callFuncs(cleanups)
+			return nil, err
+		}
+		if cleanup != nil {
+			cleanups = append(cleanups, cleanup)
+		}
+	}
+	return func() {
+		callFuncs(cleanups)
+	}, nil
+}
+
+func callFuncs(fs []func()) {
+	for _, f := range fs {
+		f()
+	}
+}