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105 lines
3.1 KiB
Go
105 lines
3.1 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package graceful
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import (
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"context"
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"runtime/pprof"
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"sync"
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"time"
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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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// Manager manages the graceful shutdown process
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type Manager struct {
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ctx context.Context
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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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shutdownRequested chan struct{}
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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{ctx: ctx, shutdownRequested: make(chan struct{})}
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manager.createServerWaitGroup.Add(numberOfServersToCreate)
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manager.prepare(ctx)
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manager.start()
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return manager
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}
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func (g *Manager) prepare(ctx context.Context) {
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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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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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if !g.setStateTransition(stateInit, stateRunning) {
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panic("invalid graceful manager state: transition from init to running failed")
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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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select {
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case <-g.shutdownRequested:
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default:
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close(g.shutdownRequested)
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}
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forked := g.forked
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g.lock.Unlock()
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if !forked {
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g.notify(stoppingMsg)
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} else {
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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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