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Refactor cmd code of easegress-server (#1043)
* prepare for custom build * add comments
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| /* | ||
| * Copyright (c) 2017, MegaEase | ||
| * All rights reserved. | ||
| * | ||
| * 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:https://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 cmd contains useful functions for Easegress server and client. | ||
| package cmd | ||
|
|
||
| import ( | ||
| "log" | ||
| "math/rand" | ||
| "os" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/megaease/easegress/pkg/api" | ||
| "github.com/megaease/easegress/pkg/cluster" | ||
| "github.com/megaease/easegress/pkg/common" | ||
| "github.com/megaease/easegress/pkg/env" | ||
| "github.com/megaease/easegress/pkg/graceupdate" | ||
| "github.com/megaease/easegress/pkg/logger" | ||
| "github.com/megaease/easegress/pkg/option" | ||
| "github.com/megaease/easegress/pkg/pidfile" | ||
| "github.com/megaease/easegress/pkg/profile" | ||
| "github.com/megaease/easegress/pkg/supervisor" | ||
| "github.com/megaease/easegress/pkg/version" | ||
| ) | ||
|
|
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| // RunServer runs Easegress server. | ||
| func RunServer() { | ||
| rand.Seed(time.Now().UnixNano()) | ||
|
|
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| opt := option.New() | ||
| if err := opt.Parse(); err != nil { | ||
| common.Exit(1, err.Error()) | ||
| } | ||
|
|
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| if opt.ShowVersion { | ||
| common.Exit(0, version.Short) | ||
| } | ||
| if opt.ShowHelp { | ||
| common.Exit(0, opt.FlagUsages()) | ||
| } | ||
|
|
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| err := env.InitServerDir(opt) | ||
| if err != nil { | ||
| log.Printf("failed to init env: %v", err) | ||
| os.Exit(1) | ||
| } | ||
|
|
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| logger.Init(opt) | ||
| defer logger.Sync() | ||
| logger.Infof("%s", version.Long) | ||
|
|
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| if opt.SignalUpgrade { | ||
| pid, err := pidfile.Read(opt) | ||
|
|
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| if err != nil { | ||
| logger.Errorf("failed to read pidfile: %v", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| if err := common.RaiseSignal(pid, common.SignalUsr2); err != nil { | ||
| logger.Errorf("failed to send signal: %v", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| logger.Infof("graceful upgrade signal sent") | ||
|
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| return | ||
| } | ||
|
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| // disable force-new-cluster for graceful update | ||
| if graceupdate.IsInherit() { | ||
| opt.ForceNewCluster = false | ||
| } else { | ||
| err := pidfile.Write(opt) | ||
| if err != nil { | ||
| logger.Errorf("write pidfile failed: %v", err) | ||
| os.Exit(1) | ||
| } | ||
| } | ||
|
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| profile, err := profile.New(opt) | ||
| if err != nil { | ||
| logger.Errorf("new profile failed: %v", err) | ||
| os.Exit(1) | ||
| } | ||
| cls, err := cluster.New(opt) | ||
| if err != nil { | ||
| logger.Errorf("new cluster failed: %v", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| super := supervisor.MustNew(opt, cls) | ||
|
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| apiServer := api.MustNewServer(opt, cls, super, profile) | ||
|
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| if graceupdate.CallOriProcessTerm(super.FirstHandleDone()) { | ||
| pidfile.Write(opt) | ||
| } | ||
|
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| closeCls := func() { | ||
| wg := &sync.WaitGroup{} | ||
| wg.Add(2) | ||
| apiServer.Close(wg) | ||
| cls.CloseServer(wg) | ||
| wg.Wait() | ||
| } | ||
| restartCls := func() { | ||
| cls.StartServer() | ||
| apiServer = api.MustNewServer(opt, cls, super, profile) | ||
| } | ||
| if err := graceupdate.NotifySigUsr2(closeCls, restartCls); err != nil { | ||
| log.Printf("failed to notify signal: %v", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| sigChan := make(chan common.Signal, 1) | ||
| if err := common.NotifySignal(sigChan, common.SignalInt, common.SignalTerm); err != nil { | ||
| log.Printf("failed to register signal: %v", err) | ||
| os.Exit(1) | ||
| } | ||
| sig := <-sigChan | ||
| go func() { | ||
| sig := <-sigChan | ||
| logger.Infof("%s signal received, closing easegress immediately", sig) | ||
| os.Exit(255) | ||
| }() | ||
| logger.Infof("%s signal received, closing easegress", sig) | ||
|
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| wg := &sync.WaitGroup{} | ||
| wg.Add(4) | ||
| apiServer.Close(wg) | ||
| super.Close(wg) | ||
| cls.Close(wg) | ||
| profile.Close(wg) | ||
| wg.Wait() | ||
| } |
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