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/*
*
* 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()
}
}
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