Graceful: Xorm, RepoIndexer, Cron and Others (#9282)

* Change graceful to use a singleton obtained through GetManager instead of a global.
* Graceful: Make TestPullRequests shutdownable
* Graceful: Make the cron tasks graceful
* Graceful: AddTestPullRequest run in graceful ctx
* Graceful: SyncMirrors shutdown
* Graceful: SetDefaultContext for Xorm to be HammerContext
* Avoid starting graceful for migrate commands and checkout
* Graceful: DeliverHooks now can be shutdown
* Fix multiple syncing errors in modules/sync/UniqueQueue &  Make UniqueQueue closable
* Begin the process of making the repo indexer shutdown gracefully

3 files changed, 12 insertions, 6 deletions

diff --git a/cmd/migrate.go b/cmd/migrate.go
index 1fa1d09e25..2428925887 100644
--- a/cmd/migrate.go
+++ b/cmd/migrate.go
@@ -5,6 +5,8 @@
 package cmd
 
 import (
+	"context"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/models/migrations"
 	"code.gitea.io/gitea/modules/log"
@@ -32,7 +34,7 @@ func runMigrate(ctx *cli.Context) error {
 	log.Trace("Log path: %s", setting.LogRootPath)
 	setting.InitDBConfig()
 
-	if err := models.NewEngine(migrations.Migrate); err != nil {
+	if err := models.NewEngine(context.Background(), migrations.Migrate); err != nil {
 		log.Fatal("Failed to initialize ORM engine: %v", err)
 		return err
 	}
diff --git a/cmd/web.go b/cmd/web.go
index cc00a32198..243b9a4108 100644
--- a/cmd/web.go
+++ b/cmd/web.go
@@ -5,6 +5,7 @@
 package cmd
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	_ "net/http/pprof" // Used for debugging if enabled and a web server is running
@@ -96,6 +97,10 @@ func runLetsEncryptFallbackHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func runWeb(ctx *cli.Context) error {
+	managerCtx, cancel := context.WithCancel(context.Background())
+	graceful.InitManager(managerCtx)
+	defer cancel()
+
 	if os.Getppid() > 1 && len(os.Getenv("LISTEN_FDS")) > 0 {
 		log.Info("Restarting Gitea on PID: %d from parent PID: %d", os.Getpid(), os.Getppid())
 	} else {
@@ -108,7 +113,7 @@ func runWeb(ctx *cli.Context) error {
 	}
 
 	// Perform global initialization
-	routers.GlobalInit()
+	routers.GlobalInit(graceful.GetManager().HammerContext())
 
 	// Set up Macaron
 	m := routes.NewMacaron()
@@ -199,8 +204,7 @@ func runWeb(ctx *cli.Context) error {
 		log.Critical("Failed to start server: %v", err)
 	}
 	log.Info("HTTP Listener: %s Closed", listenAddr)
-	graceful.Manager.WaitForServers()
-	graceful.Manager.WaitForTerminate()
+	<-graceful.GetManager().Done()
 	log.Info("PID: %d Gitea Web Finished", os.Getpid())
 	log.Close()
 	return nil
diff --git a/cmd/web_graceful.go b/cmd/web_graceful.go
index 5f8b85b390..f3c41766af 100644
--- a/cmd/web_graceful.go
+++ b/cmd/web_graceful.go
@@ -28,13 +28,13 @@ func runHTTPSWithTLSConfig(network, listenAddr string, tlsConfig *tls.Config, m
 
 // NoHTTPRedirector tells our cleanup routine that we will not be using a fallback http redirector
 func NoHTTPRedirector() {
-	graceful.Manager.InformCleanup()
+	graceful.GetManager().InformCleanup()
 }
 
 // NoMainListener tells our cleanup routine that we will not be using a possibly provided listener
 // for our main HTTP/HTTPS service
 func NoMainListener() {
-	graceful.Manager.InformCleanup()
+	graceful.GetManager().InformCleanup()
 }
 
 func runFCGI(network, listenAddr string, m http.Handler) error {