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Refactor graceful manager to use shared code (#28073)

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Make "windows" and "unix" share as much code as possible. No logic
change.
pull/28200/head^2
wxiaoguang 1 year ago committed by GitHub
parent ad9aac3975
commit 2ac2796a4c
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3 changed files with 119 additions and 174 deletions
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  1. 104
      modules/graceful/manager_common.go
  2. 102
      modules/graceful/manager_unix.go
  3. 87
      modules/graceful/manager_windows.go

104
modules/graceful/manager_common.go
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@ -0,0 +1,104 @@
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package graceful
import (
"context"
"runtime/pprof"
"sync"
"time"
)
type systemdNotifyMsg string
const (
readyMsg systemdNotifyMsg = "READY=1"
stoppingMsg systemdNotifyMsg = "STOPPING=1"
reloadingMsg systemdNotifyMsg = "RELOADING=1"
watchdogMsg systemdNotifyMsg = "WATCHDOG=1"
)
func statusMsg(msg string) systemdNotifyMsg {
return systemdNotifyMsg("STATUS=" + msg)
}
// Manager manages the graceful shutdown process
type Manager struct {
ctx context.Context
isChild bool
forked bool
lock sync.RWMutex
state state
shutdownCtx context.Context
hammerCtx context.Context
terminateCtx context.Context
managerCtx context.Context
shutdownCtxCancel context.CancelFunc
hammerCtxCancel context.CancelFunc
terminateCtxCancel context.CancelFunc
managerCtxCancel context.CancelFunc
runningServerWaitGroup sync.WaitGroup
createServerWaitGroup sync.WaitGroup
terminateWaitGroup sync.WaitGroup
shutdownRequested chan struct{}
toRunAtShutdown []func()
toRunAtTerminate []func()
}
func newGracefulManager(ctx context.Context) *Manager {
manager := &Manager{ctx: ctx, shutdownRequested: make(chan struct{})}
manager.createServerWaitGroup.Add(numberOfServersToCreate)
manager.prepare(ctx)
manager.start()
return manager
}
func (g *Manager) prepare(ctx context.Context) {
g.terminateCtx, g.terminateCtxCancel = context.WithCancel(ctx)
g.shutdownCtx, g.shutdownCtxCancel = context.WithCancel(ctx)
g.hammerCtx, g.hammerCtxCancel = context.WithCancel(ctx)
g.managerCtx, g.managerCtxCancel = context.WithCancel(ctx)
g.terminateCtx = pprof.WithLabels(g.terminateCtx, pprof.Labels("graceful-lifecycle", "with-terminate"))
g.shutdownCtx = pprof.WithLabels(g.shutdownCtx, pprof.Labels("graceful-lifecycle", "with-shutdown"))
g.hammerCtx = pprof.WithLabels(g.hammerCtx, pprof.Labels("graceful-lifecycle", "with-hammer"))
g.managerCtx = pprof.WithLabels(g.managerCtx, pprof.Labels("graceful-lifecycle", "with-manager"))
if !g.setStateTransition(stateInit, stateRunning) {
panic("invalid graceful manager state: transition from init to running failed")
}
}
// DoImmediateHammer causes an immediate hammer
func (g *Manager) DoImmediateHammer() {
g.notify(statusMsg("Sending immediate hammer"))
g.doHammerTime(0 * time.Second)
}
// DoGracefulShutdown causes a graceful shutdown
func (g *Manager) DoGracefulShutdown() {
g.lock.Lock()
select {
case <-g.shutdownRequested:
default:
close(g.shutdownRequested)
}
forked := g.forked
g.lock.Unlock()
if !forked {
g.notify(stoppingMsg)
} else {
g.notify(statusMsg("Shutting down after fork"))
}
g.doShutdown()
}
// RegisterServer registers the running of a listening server, in the case of unix this means that the parent process can now die.
// Any call to RegisterServer must be matched by a call to ServerDone
func (g *Manager) RegisterServer() {
KillParent()
g.runningServerWaitGroup.Add(1)
}

102
modules/graceful/manager_unix.go
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@ -12,7 +12,6 @@ import (
"os/signal"
"runtime/pprof"
"strconv"
"sync"
"syscall"
"time"
@ -22,51 +21,6 @@ import (
"code.gitea.io/gitea/modules/setting"
)
// Manager manages the graceful shutdown process
type Manager struct {
isChild bool
forked bool
lock *sync.RWMutex
state state
shutdownCtx context.Context
hammerCtx context.Context
terminateCtx context.Context
managerCtx context.Context
shutdownCtxCancel context.CancelFunc
hammerCtxCancel context.CancelFunc
terminateCtxCancel context.CancelFunc
managerCtxCancel context.CancelFunc
runningServerWaitGroup sync.WaitGroup
createServerWaitGroup sync.WaitGroup
terminateWaitGroup sync.WaitGroup
toRunAtShutdown []func()
toRunAtTerminate []func()
}
func newGracefulManager(ctx context.Context) *Manager {
manager := &Manager{
isChild: len(os.Getenv(listenFDsEnv)) > 0 && os.Getppid() > 1,
lock: &sync.RWMutex{},
}
manager.createServerWaitGroup.Add(numberOfServersToCreate)
manager.start(ctx)
return manager
}
type systemdNotifyMsg string
const (
readyMsg systemdNotifyMsg = "READY=1"
stoppingMsg systemdNotifyMsg = "STOPPING=1"
reloadingMsg systemdNotifyMsg = "RELOADING=1"
watchdogMsg systemdNotifyMsg = "WATCHDOG=1"
)
func statusMsg(msg string) systemdNotifyMsg {
return systemdNotifyMsg("STATUS=" + msg)
}
func pidMsg() systemdNotifyMsg {
return systemdNotifyMsg("MAINPID=" + strconv.Itoa(os.Getpid()))
}
@ -89,27 +43,13 @@ func (g *Manager) notify(msg systemdNotifyMsg) {
}
}
func (g *Manager) start(ctx context.Context) {
// Make contexts
g.terminateCtx, g.terminateCtxCancel = context.WithCancel(ctx)
g.shutdownCtx, g.shutdownCtxCancel = context.WithCancel(ctx)
g.hammerCtx, g.hammerCtxCancel = context.WithCancel(ctx)
g.managerCtx, g.managerCtxCancel = context.WithCancel(ctx)
// Next add pprof labels to these contexts
g.terminateCtx = pprof.WithLabels(g.terminateCtx, pprof.Labels("graceful-lifecycle", "with-terminate"))
g.shutdownCtx = pprof.WithLabels(g.shutdownCtx, pprof.Labels("graceful-lifecycle", "with-shutdown"))
g.hammerCtx = pprof.WithLabels(g.hammerCtx, pprof.Labels("graceful-lifecycle", "with-hammer"))
g.managerCtx = pprof.WithLabels(g.managerCtx, pprof.Labels("graceful-lifecycle", "with-manager"))
func (g *Manager) start() {
// Now label this and all goroutines created by this goroutine with the graceful-lifecycle manager
pprof.SetGoroutineLabels(g.managerCtx)
defer pprof.SetGoroutineLabels(ctx)
defer pprof.SetGoroutineLabels(g.ctx)
g.isChild = len(os.Getenv(listenFDsEnv)) > 0 && os.Getppid() > 1
// Set the running state & handle signals
if !g.setStateTransition(stateInit, stateRunning) {
panic("invalid graceful manager state: transition from init to running failed")
}
g.notify(statusMsg("Starting Gitea"))
g.notify(pidMsg())
go g.handleSignals(g.managerCtx)
@ -118,11 +58,9 @@ func (g *Manager) start(ctx context.Context) {
startupDone := make(chan struct{})
go func() {
defer close(startupDone)
// Wait till we're done getting all of the listeners and then close
// the unused ones
// Wait till we're done getting all the listeners and then close the unused ones
g.createServerWaitGroup.Wait()
// Ignore the error here there's not much we can do with it
// They're logged in the CloseProvidedListeners function
// Ignore the error here there's not much we can do with it, they're logged in the CloseProvidedListeners function
_ = CloseProvidedListeners()
g.notify(readyMsg)
}()
@ -133,7 +71,7 @@ func (g *Manager) start(ctx context.Context) {
return
case <-g.IsShutdown():
func() {
// When waitgroup counter goes negative it will panic - we don't care about this so we can just ignore it.
// When WaitGroup counter goes negative it will panic - we don't care about this so we can just ignore it.
defer func() {
_ = recover()
}()
@ -255,29 +193,3 @@ func (g *Manager) DoGracefulRestart() {
g.doShutdown()
}
}
// DoImmediateHammer causes an immediate hammer
func (g *Manager) DoImmediateHammer() {
g.notify(statusMsg("Sending immediate hammer"))
g.doHammerTime(0 * time.Second)
}
// DoGracefulShutdown causes a graceful shutdown
func (g *Manager) DoGracefulShutdown() {
g.lock.Lock()
if !g.forked {
g.lock.Unlock()
g.notify(stoppingMsg)
} else {
g.lock.Unlock()
g.notify(statusMsg("Shutting down after fork"))
}
g.doShutdown()
}
// RegisterServer registers the running of a listening server, in the case of unix this means that the parent process can now die.
// Any call to RegisterServer must be matched by a call to ServerDone
func (g *Manager) RegisterServer() {
KillParent()
g.runningServerWaitGroup.Add(1)
}

87
modules/graceful/manager_windows.go
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@ -7,11 +7,9 @@
package graceful
import (
"context"
"os"
"runtime/pprof"
"strconv"
"sync"
"time"
"code.gitea.io/gitea/modules/log"
@ -30,64 +28,11 @@ const (
acceptHammerCode = svc.Accepted(hammerCode)
)
// Manager manages the graceful shutdown process
type Manager struct {
ctx context.Context
isChild bool
lock *sync.RWMutex
state state
shutdownCtx context.Context
hammerCtx context.Context
terminateCtx context.Context
managerCtx context.Context
shutdownCtxCancel context.CancelFunc
hammerCtxCancel context.CancelFunc
terminateCtxCancel context.CancelFunc
managerCtxCancel context.CancelFunc
runningServerWaitGroup sync.WaitGroup
createServerWaitGroup sync.WaitGroup
terminateWaitGroup sync.WaitGroup
shutdownRequested chan struct{}
toRunAtShutdown []func()
toRunAtTerminate []func()
}
func newGracefulManager(ctx context.Context) *Manager {
manager := &Manager{
isChild: false,
lock: &sync.RWMutex{},
ctx: ctx,
}
manager.createServerWaitGroup.Add(numberOfServersToCreate)
manager.start()
return manager
}
func (g *Manager) start() {
// Make contexts
g.terminateCtx, g.terminateCtxCancel = context.WithCancel(g.ctx)
g.shutdownCtx, g.shutdownCtxCancel = context.WithCancel(g.ctx)
g.hammerCtx, g.hammerCtxCancel = context.WithCancel(g.ctx)
g.managerCtx, g.managerCtxCancel = context.WithCancel(g.ctx)
// Next add pprof labels to these contexts
g.terminateCtx = pprof.WithLabels(g.terminateCtx, pprof.Labels("graceful-lifecycle", "with-terminate"))
g.shutdownCtx = pprof.WithLabels(g.shutdownCtx, pprof.Labels("graceful-lifecycle", "with-shutdown"))
g.hammerCtx = pprof.WithLabels(g.hammerCtx, pprof.Labels("graceful-lifecycle", "with-hammer"))
g.managerCtx = pprof.WithLabels(g.managerCtx, pprof.Labels("graceful-lifecycle", "with-manager"))
// Now label this and all goroutines created by this goroutine with the graceful-lifecycle manager
pprof.SetGoroutineLabels(g.managerCtx)
defer pprof.SetGoroutineLabels(g.ctx)
// Make channels
g.shutdownRequested = make(chan struct{})
// Set the running state
if !g.setStateTransition(stateInit, stateRunning) {
panic("invalid graceful manager state: transition from init to running failed")
}
if skip, _ := strconv.ParseBool(os.Getenv("SKIP_MINWINSVC")); skip {
log.Trace("Skipping SVC check as SKIP_MINWINSVC is set")
return
@ -201,30 +146,6 @@ hammerLoop:
return false, 0
}
// DoImmediateHammer causes an immediate hammer
func (g *Manager) DoImmediateHammer() {
g.doHammerTime(0 * time.Second)
}
// DoGracefulShutdown causes a graceful shutdown
func (g *Manager) DoGracefulShutdown() {
g.lock.Lock()
select {
case <-g.shutdownRequested:
g.lock.Unlock()
default:
close(g.shutdownRequested)
g.lock.Unlock()
g.doShutdown()
}
}
// RegisterServer registers the running of a listening server.
// Any call to RegisterServer must be matched by a call to ServerDone
func (g *Manager) RegisterServer() {
g.runningServerWaitGroup.Add(1)
}
func (g *Manager) awaitServer(limit time.Duration) bool {
c := make(chan struct{})
go func() {
@ -249,3 +170,11 @@ func (g *Manager) awaitServer(limit time.Duration) bool {
}
}
}
func (g *Manager) notify(msg systemdNotifyMsg) {
// Windows doesn't use systemd to notify
}
func KillParent() {
// Windows doesn't need to "kill parent" because there is no graceful restart
}

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