mirror of
https://github.com/go-gitea/gitea
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290 lines
8.2 KiB
Go
290 lines
8.2 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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"sync"
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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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// Manager manages the graceful shutdown process
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type Manager struct {
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isChild bool
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forked bool
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lock *sync.RWMutex
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state state
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shutdownCtx context.Context
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hammerCtx context.Context
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terminateCtx context.Context
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managerCtx context.Context
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shutdownCtxCancel context.CancelFunc
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hammerCtxCancel context.CancelFunc
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terminateCtxCancel context.CancelFunc
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managerCtxCancel context.CancelFunc
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runningServerWaitGroup sync.WaitGroup
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createServerWaitGroup sync.WaitGroup
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terminateWaitGroup sync.WaitGroup
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toRunAtShutdown []func()
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toRunAtTerminate []func()
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}
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func newGracefulManager(ctx context.Context) *Manager {
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manager := &Manager{
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isChild: len(os.Getenv(listenFDsEnv)) > 0 && os.Getppid() > 1,
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lock: &sync.RWMutex{},
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}
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manager.createServerWaitGroup.Add(numberOfServersToCreate)
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manager.start(ctx)
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return manager
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}
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type systemdNotifyMsg string
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const (
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readyMsg systemdNotifyMsg = "READY=1"
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stoppingMsg systemdNotifyMsg = "STOPPING=1"
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reloadingMsg systemdNotifyMsg = "RELOADING=1"
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watchdogMsg systemdNotifyMsg = "WATCHDOG=1"
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)
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func statusMsg(msg string) systemdNotifyMsg {
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return systemdNotifyMsg("STATUS=" + msg)
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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(ctx context.Context) {
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// Make contexts
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g.terminateCtx, g.terminateCtxCancel = context.WithCancel(ctx)
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g.shutdownCtx, g.shutdownCtxCancel = context.WithCancel(ctx)
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g.hammerCtx, g.hammerCtxCancel = context.WithCancel(ctx)
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g.managerCtx, g.managerCtxCancel = context.WithCancel(ctx)
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// Next add pprof labels to these contexts
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g.terminateCtx = pprof.WithLabels(g.terminateCtx, pprof.Labels("graceful-lifecycle", "with-terminate"))
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g.shutdownCtx = pprof.WithLabels(g.shutdownCtx, pprof.Labels("graceful-lifecycle", "with-shutdown"))
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g.hammerCtx = pprof.WithLabels(g.hammerCtx, pprof.Labels("graceful-lifecycle", "with-hammer"))
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g.managerCtx = pprof.WithLabels(g.managerCtx, pprof.Labels("graceful-lifecycle", "with-manager"))
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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(ctx)
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// Set the running state & handle signals
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g.setState(stateRunning)
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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 close(startupDone)
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// Wait till we're done getting all of the listeners and then close
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// the unused ones
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func() {
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// FIXME: there is a fundamental design problem of the "manager" and the "wait group".
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// If nothing has started, the "Wait" just panics: sync: WaitGroup is reused before previous Wait has returned
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// There is no clear solution besides a complete rewriting of the "manager"
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defer func() {
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_ = recover()
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}()
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g.createServerWaitGroup.Wait()
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}()
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// Ignore the error here there's not much we can do with it
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// They're logged in the CloseProvidedListeners function
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_ = CloseProvidedListeners()
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g.notify(readyMsg)
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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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func() {
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// When waitgroup counter goes negative it will panic - we don't care about this so we can just ignore it.
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defer func() {
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_ = recover()
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}()
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// Ensure that the createServerWaitGroup stops waiting
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for {
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g.createServerWaitGroup.Done()
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}
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}()
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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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// DoImmediateHammer causes an immediate hammer
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func (g *Manager) DoImmediateHammer() {
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g.notify(statusMsg("Sending immediate hammer"))
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g.doHammerTime(0 * time.Second)
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}
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// DoGracefulShutdown causes a graceful shutdown
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func (g *Manager) DoGracefulShutdown() {
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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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g.notify(stoppingMsg)
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} else {
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g.lock.Unlock()
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g.notify(statusMsg("Shutting down after fork"))
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}
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g.doShutdown()
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}
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// RegisterServer registers the running of a listening server, in the case of unix this means that the parent process can now die.
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// Any call to RegisterServer must be matched by a call to ServerDone
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func (g *Manager) RegisterServer() {
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KillParent()
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g.runningServerWaitGroup.Add(1)
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}
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