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server.go
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server.go
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// Copyright 2021 The sacloud 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 grpcutil
import (
"fmt"
"log"
"net"
"os"
"github.com/sacloud/autoscaler/config"
"google.golang.org/grpc"
)
type ListenerOption struct {
Address string
TLSConfig *config.TLSStruct
ServerOpts []grpc.ServerOption
}
// Server 指定のオプションでリッスン構成をした後でリッスンし、*grpc.Serverとクリーンアップ用のfuncを返す
func Server(opt *ListenerOption) (*grpc.Server, net.Listener, func(), error) {
target := ParseTarget(opt.Address, false)
schema := "tcp"
if target.Scheme == "unix" || target.Scheme == "unix-abstract" { // nolint:staticcheck
schema = "unix"
}
listener, err := net.Listen(schema, target.Endpoint) // nolint:staticcheck
if err != nil {
return nil, nil, nil, fmt.Errorf("net.Listen failed: %s", err)
}
cleanup := func() {
listener.Close() // nolint
if schema == "unix" {
if _, err := os.Stat(target.Endpoint); err == nil { // nolint:staticcheck
if err := os.RemoveAll(target.Endpoint); err != nil { // nolint:staticcheck
log.Printf("cleanup failed: %s", err) // nolint
}
}
}
}
var serverOpts []grpc.ServerOption
if opt.TLSConfig != nil && schema != "unix" {
cred, err := opt.TLSConfig.TransportCredentials()
if err != nil && err != config.ErrNoTLSConfig {
return nil, nil, nil, err
}
serverOpts = append(serverOpts, grpc.Creds(cred))
}
serverOpts = append(serverOpts, opt.ServerOpts...)
return grpc.NewServer(serverOpts...), listener, cleanup, nil
}