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main.go
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main.go
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/*
* 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
*
* 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 main
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/registry"
"github.com/megaease/easegress/pkg/supervisor"
"github.com/megaease/easegress/pkg/version"
)
func main() {
rand.Seed(time.Now().UnixNano())
opt := option.New()
if err := opt.Parse(); err != nil {
common.Exit(1, err.Error())
}
if opt.ShowVersion {
common.Exit(0, version.Short)
}
if opt.ShowHelp {
common.Exit(0, opt.FlagUsages())
}
err := env.InitServerDir(opt)
if err != nil {
log.Printf("failed to init env: %v", err)
os.Exit(1)
}
logger.Init(opt)
defer logger.Sync()
logger.Infof("%s", version.Long)
if opt.SignalUpgrade {
pid, err := pidfile.Read(opt)
if err != nil {
logger.Errorf("failed to read pidfile: %v", err)
os.Exit(1)
}
if err := common.RaiseSignal(pid, common.SignalUsr2); err != nil {
logger.Errorf("failed to send signal: %v", err)
os.Exit(1)
}
logger.Infof("graceful upgrade signal sent")
return
}
// 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)
}
}
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)
}
super := supervisor.MustNew(opt, cls)
apiServer := api.MustNewServer(opt, cls, super, profile)
if graceupdate.CallOriProcessTerm(super.FirstHandleDone()) {
pidfile.Write(opt)
}
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)
}
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)
wg := &sync.WaitGroup{}
wg.Add(4)
apiServer.Close(wg)
super.Close(wg)
cls.Close(wg)
profile.Close(wg)
wg.Wait()
}