1 files changed, 190 insertions, 0 deletions
diff --git a/modules/graceful/manager_windows.go b/modules/graceful/manager_windows.go
new file mode 100644
index 00000000..bee44381
--- /dev/null
+++ b/modules/graceful/manager_windows.go
@@ -0,0 +1,190 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+// This code is heavily inspired by the archived gofacebook/gracenet/net.go handler
+
+//go:build windows
+
+package graceful
+
+import (
+	"os"
+	"runtime/pprof"
+	"strconv"
+	"time"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+
+	"golang.org/x/sys/windows/svc"
+	"golang.org/x/sys/windows/svc/debug"
+)
+
+// WindowsServiceName is the name of the Windows service
+var WindowsServiceName = "gitea"
+
+const (
+	hammerCode       = 128
+	hammerCmd        = svc.Cmd(hammerCode)
+	acceptHammerCode = svc.Accepted(hammerCode)
+)
+
+func (g *Manager) start() {
+	// Now label this and all goroutines created by this goroutine with the gracefulLifecycle manager
+	pprof.SetGoroutineLabels(g.managerCtx)
+	defer pprof.SetGoroutineLabels(g.ctx)
+
+	if skip, _ := strconv.ParseBool(os.Getenv("SKIP_MINWINSVC")); skip {
+		log.Trace("Skipping SVC check as SKIP_MINWINSVC is set")
+		return
+	}
+
+	// Make SVC process
+	run := svc.Run
+
+	//lint:ignore SA1019 We use IsAnInteractiveSession because IsWindowsService has a different permissions profile
+	isAnInteractiveSession, err := svc.IsAnInteractiveSession() //nolint:staticcheck
+	if err != nil {
+		log.Error("Unable to ascertain if running as an Windows Service: %v", err)
+		return
+	}
+	if isAnInteractiveSession {
+		log.Trace("Not running a service ... using the debug SVC manager")
+		run = debug.Run
+	}
+	go func() {
+		_ = run(WindowsServiceName, g)
+	}()
+}
+
+// Execute makes Manager implement svc.Handler
+func (g *Manager) Execute(args []string, changes <-chan svc.ChangeRequest, status chan<- svc.Status) (svcSpecificEC bool, exitCode uint32) {
+	if setting.StartupTimeout > 0 {
+		status <- svc.Status{State: svc.StartPending, WaitHint: uint32(setting.StartupTimeout / time.Millisecond)}
+	} else {
+		status <- svc.Status{State: svc.StartPending}
+	}
+
+	log.Trace("Awaiting server start-up")
+	// Now need to wait for everything to start...
+	if !g.awaitServer(setting.StartupTimeout) {
+		log.Trace("... start-up failed ... Stopped")
+		return false, 1
+	}
+
+	log.Trace("Sending Running state to SVC")
+
+	// We need to implement some way of svc.AcceptParamChange/svc.ParamChange
+	status <- svc.Status{
+		State:   svc.Running,
+		Accepts: svc.AcceptStop | svc.AcceptShutdown | acceptHammerCode,
+	}
+
+	log.Trace("Started")
+
+	waitTime := 30 * time.Second
+
+loop:
+	for {
+		select {
+		case <-g.ctx.Done():
+			log.Trace("Shutting down")
+			g.DoGracefulShutdown()
+			waitTime += setting.GracefulHammerTime
+			break loop
+		case <-g.shutdownRequested:
+			log.Trace("Shutting down")
+			waitTime += setting.GracefulHammerTime
+			break loop
+		case change := <-changes:
+			switch change.Cmd {
+			case svc.Interrogate:
+				log.Trace("SVC sent interrogate")
+				status <- change.CurrentStatus
+			case svc.Stop, svc.Shutdown:
+				log.Trace("SVC requested shutdown - shutting down")
+				g.DoGracefulShutdown()
+				waitTime += setting.GracefulHammerTime
+				break loop
+			case hammerCode:
+				log.Trace("SVC requested hammer - shutting down and hammering immediately")
+				g.DoGracefulShutdown()
+				g.DoImmediateHammer()
+				break loop
+			default:
+				log.Debug("Unexpected control request: %v", change.Cmd)
+			}
+		}
+	}
+
+	log.Trace("Sending StopPending state to SVC")
+	status <- svc.Status{
+		State:    svc.StopPending,
+		WaitHint: uint32(waitTime / time.Millisecond),
+	}
+
+hammerLoop:
+	for {
+		select {
+		case change := <-changes:
+			switch change.Cmd {
+			case svc.Interrogate:
+				log.Trace("SVC sent interrogate")
+				status <- change.CurrentStatus
+			case svc.Stop, svc.Shutdown, hammerCmd:
+				log.Trace("SVC requested hammer - hammering immediately")
+				g.DoImmediateHammer()
+				break hammerLoop
+			default:
+				log.Debug("Unexpected control request: %v", change.Cmd)
+			}
+		case <-g.hammerCtx.Done():
+			break hammerLoop
+		}
+	}
+
+	log.Trace("Stopped")
+	return false, 0
+}
+
+func (g *Manager) awaitServer(limit time.Duration) bool {
+	c := make(chan struct{})
+	go func() {
+		g.createServerCond.L.Lock()
+		for {
+			if g.createdServer >= numberOfServersToCreate {
+				g.createServerCond.L.Unlock()
+				close(c)
+				return
+			}
+			select {
+			case <-g.IsShutdown():
+				g.createServerCond.L.Unlock()
+				return
+			default:
+			}
+			g.createServerCond.Wait()
+		}
+	}()
+
+	var tc <-chan time.Time
+	if limit > 0 {
+		tc = time.After(limit)
+	}
+	select {
+	case <-c:
+		return true // completed normally
+	case <-tc:
+		return false // timed out
+	case <-g.IsShutdown():
+		g.createServerCond.Signal()
+		return false
+	}
+}
+
+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
+}