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Restore Graceful Restarting & Socket Activation (#7274)

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* Prevent deadlock in indexer initialisation during graceful restart

* Move from gracehttp to our own service to add graceful ssh

* Add timeout for start of indexers and make hammer time configurable

* Fix issue with re-initialization in indexer during tests

* move the code to detect use of closed to graceful

* Handle logs gracefully - add a pid suffix just before restart

* Move to using a cond and a holder for indexers

* use time.Since

* Add some comments and attribution

* update modules.txt

* Use zero to disable timeout

* Move RestartProcess to its own file

* Add cleanup routine
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zeripath 2019-10-15 14:39:51 +01:00 • committed by GitHub
parent 4a290bd64c
commit 167e8f18da
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45 changed files with 1202 additions and 2009 deletions
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93
modules/graceful/server_signals.go Normal file
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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"
"os/signal"
"syscall"
"time"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
)
var hookableSignals []os.Signal
func init() {
hookableSignals = []os.Signal{
syscall.SIGHUP,
syscall.SIGUSR1,
syscall.SIGUSR2,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGTSTP,
}
}
// handleSignals listens for os Signals and calls any hooked in function that the
// user had registered with the signal.
func (srv *Server) handleSignals() {
var sig os.Signal
signal.Notify(
srv.sigChan,
hookableSignals...,
)
pid := syscall.Getpid()
for {
sig = <-srv.sigChan
srv.preSignalHooks(sig)
switch sig {
case syscall.SIGHUP:
if setting.GracefulRestartable {
log.Info("PID: %d. Received SIGHUP. Forking...", pid)
err := srv.fork()
if err != nil {
log.Error("Error whilst forking from PID: %d : %v", pid, err)
}
} else {
log.Info("PID: %d. Received SIGHUP. Not set restartable. Shutting down...", pid)
srv.shutdown()
}
case syscall.SIGUSR1:
log.Info("PID %d. Received SIGUSR1.", pid)
case syscall.SIGUSR2:
log.Warn("PID %d. Received SIGUSR2. Hammering...", pid)
srv.hammerTime(0 * time.Second)
case syscall.SIGINT:
log.Warn("PID %d. Received SIGINT. Shutting down...", pid)
srv.shutdown()
case syscall.SIGTERM:
log.Warn("PID %d. Received SIGTERM. Shutting down...", pid)
srv.shutdown()
case syscall.SIGTSTP:
log.Info("PID %d. Received SIGTSTP.")
default:
log.Info("PID %d. Received %v.", sig)
}
srv.postSignalHooks(sig)
}
}
func (srv *Server) preSignalHooks(sig os.Signal) {
if _, notSet := srv.PreSignalHooks[sig]; !notSet {
return
}
for _, f := range srv.PreSignalHooks[sig] {
f()
}
}
func (srv *Server) postSignalHooks(sig os.Signal) {
if _, notSet := srv.PostSignalHooks[sig]; !notSet {
return
}
for _, f := range srv.PostSignalHooks[sig] {
f()
}
}