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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package graceful
import (
"os"
"runtime"
"code.gitea.io/gitea/modules/log"
)
// awaitShutdown waits for the shutdown signal from the Manager
func (srv *Server) awaitShutdown() {
select {
case <-GetManager().IsShutdown():
// Shutdown
srv.doShutdown()
case <-GetManager().IsHammer():
// Hammer
srv.doShutdown()
srv.doHammer()
}
<-GetManager().IsHammer()
srv.doHammer()
}
// shutdown closes the listener so that no new connections are accepted
// and starts a goroutine that will hammer (stop all running requests) the server
// after setting.GracefulHammerTime.
func (srv *Server) doShutdown() {
// only shutdown if we're running.
if srv.getState() != stateRunning {
return
}
srv.setState(stateShuttingDown)
if srv.OnShutdown != nil {
srv.OnShutdown()
}
err := srv.listener.Close()
if err != nil {
log.Error("PID: %d Listener.Close() error: %v", os.Getpid(), err)
} else {
log.Info("PID: %d Listener (%s) closed.", os.Getpid(), srv.listener.Addr())
}
}
func (srv *Server) doHammer() {
defer func() {
// We call srv.wg.Done() until it panics.
// This happens if we call Done() when the WaitGroup counter is already at 0
// So if it panics -> we're done, Serve() will return and the
// parent will goroutine will exit.
if r := recover(); r != nil {
log.Error("WaitGroup at 0: Error: %v", r)
}
}()
if srv.getState() != stateShuttingDown {
return
}
log.Warn("Forcefully shutting down parent")
for {
if srv.getState() == stateTerminate {
break
}
srv.wg.Done()
// Give other goroutines a chance to finish before we forcibly stop them.
runtime.Gosched()
}
}
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