mirror of
https://github.com/go-gitea/gitea
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201 lines
5 KiB
Go
201 lines
5 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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//go:build !windows
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package graceful
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import (
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"context"
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"errors"
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"os"
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"os/signal"
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"runtime/pprof"
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"strconv"
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"syscall"
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"time"
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"code.gitea.io/gitea/modules/graceful/releasereopen"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/process"
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"code.gitea.io/gitea/modules/setting"
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)
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func pidMsg() systemdNotifyMsg {
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return systemdNotifyMsg("MAINPID=" + strconv.Itoa(os.Getpid()))
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}
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// Notify systemd of status via the notify protocol
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func (g *Manager) notify(msg systemdNotifyMsg) {
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conn, err := getNotifySocket()
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if err != nil {
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// the err is logged in getNotifySocket
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return
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}
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if conn == nil {
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return
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}
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defer conn.Close()
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if _, err = conn.Write([]byte(msg)); err != nil {
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log.Warn("Failed to notify NOTIFY_SOCKET: %v", err)
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return
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}
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}
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func (g *Manager) start() {
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// Now label this and all goroutines created by this goroutine with the graceful-lifecycle manager
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pprof.SetGoroutineLabels(g.managerCtx)
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defer pprof.SetGoroutineLabels(g.ctx)
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g.isChild = len(os.Getenv(listenFDsEnv)) > 0 && os.Getppid() > 1
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g.notify(statusMsg("Starting Gitea"))
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g.notify(pidMsg())
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go g.handleSignals(g.managerCtx)
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// Handle clean up of unused provided listeners and delayed start-up
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startupDone := make(chan struct{})
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go func() {
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defer func() {
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close(startupDone)
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// Close the unused listeners
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closeProvidedListeners()
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}()
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// Wait for all servers to be created
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g.createServerCond.L.Lock()
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for {
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if g.createdServer >= numberOfServersToCreate {
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g.createServerCond.L.Unlock()
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g.notify(readyMsg)
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return
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}
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select {
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case <-g.IsShutdown():
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g.createServerCond.L.Unlock()
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return
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default:
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}
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g.createServerCond.Wait()
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}
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}()
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if setting.StartupTimeout > 0 {
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go func() {
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select {
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case <-startupDone:
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return
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case <-g.IsShutdown():
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g.createServerCond.Signal()
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return
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case <-time.After(setting.StartupTimeout):
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log.Error("Startup took too long! Shutting down")
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g.notify(statusMsg("Startup took too long! Shutting down"))
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g.notify(stoppingMsg)
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g.doShutdown()
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}
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}()
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}
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}
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func (g *Manager) handleSignals(ctx context.Context) {
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ctx, _, finished := process.GetManager().AddTypedContext(ctx, "Graceful: HandleSignals", process.SystemProcessType, true)
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defer finished()
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signalChannel := make(chan os.Signal, 1)
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signal.Notify(
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signalChannel,
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syscall.SIGHUP,
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syscall.SIGUSR1,
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syscall.SIGUSR2,
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syscall.SIGINT,
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syscall.SIGTERM,
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syscall.SIGTSTP,
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)
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watchdogTimeout := getWatchdogTimeout()
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t := &time.Ticker{}
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if watchdogTimeout != 0 {
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g.notify(watchdogMsg)
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t = time.NewTicker(watchdogTimeout / 2)
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}
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pid := syscall.Getpid()
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for {
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select {
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case sig := <-signalChannel:
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switch sig {
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case syscall.SIGHUP:
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log.Info("PID: %d. Received SIGHUP. Attempting GracefulRestart...", pid)
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g.DoGracefulRestart()
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case syscall.SIGUSR1:
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log.Warn("PID %d. Received SIGUSR1. Releasing and reopening logs", pid)
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g.notify(statusMsg("Releasing and reopening logs"))
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if err := releasereopen.GetManager().ReleaseReopen(); err != nil {
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log.Error("Error whilst releasing and reopening logs: %v", err)
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}
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case syscall.SIGUSR2:
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log.Warn("PID %d. Received SIGUSR2. Hammering...", pid)
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g.DoImmediateHammer()
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case syscall.SIGINT:
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log.Warn("PID %d. Received SIGINT. Shutting down...", pid)
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g.DoGracefulShutdown()
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case syscall.SIGTERM:
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log.Warn("PID %d. Received SIGTERM. Shutting down...", pid)
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g.DoGracefulShutdown()
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case syscall.SIGTSTP:
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log.Info("PID %d. Received SIGTSTP.", pid)
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default:
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log.Info("PID %d. Received %v.", pid, sig)
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}
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case <-t.C:
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g.notify(watchdogMsg)
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case <-ctx.Done():
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log.Warn("PID: %d. Background context for manager closed - %v - Shutting down...", pid, ctx.Err())
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g.DoGracefulShutdown()
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return
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}
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}
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}
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func (g *Manager) doFork() error {
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g.lock.Lock()
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if g.forked {
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g.lock.Unlock()
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return errors.New("another process already forked. Ignoring this one")
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}
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g.forked = true
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g.lock.Unlock()
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g.notify(reloadingMsg)
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// We need to move the file logs to append pids
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setting.RestartLogsWithPIDSuffix()
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_, err := RestartProcess()
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return err
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}
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// DoGracefulRestart causes a graceful restart
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func (g *Manager) DoGracefulRestart() {
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if setting.GracefulRestartable {
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log.Info("PID: %d. Forking...", os.Getpid())
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err := g.doFork()
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if err != nil {
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if err.Error() == "another process already forked. Ignoring this one" {
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g.DoImmediateHammer()
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} else {
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log.Error("Error whilst forking from PID: %d : %v", os.Getpid(), err)
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}
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}
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// doFork calls RestartProcess which starts a new Gitea process, so this parent process needs to exit
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// Otherwise some resources (eg: leveldb lock) will be held by this parent process and the new process will fail to start
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log.Info("PID: %d. Shutting down after forking ...", os.Getpid())
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g.doShutdown()
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} else {
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log.Info("PID: %d. Not set restartable. Shutting down...", os.Getpid())
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g.notify(stoppingMsg)
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g.doShutdown()
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}
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}
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