mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-11-24 03:21:49 +01:00
104 lines
3.1 KiB
Go
104 lines
3.1 KiB
Go
// 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)
|
|
}
|