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

1 files changed, 4 insertions, 1 deletions

diff --git a/models/models.go b/models/models.go
index 8c10e7abfc..9eb174e200 100644
--- a/models/models.go
+++ b/models/models.go
@@ -6,6 +6,7 @@
 package models
 
 import (
+	"context"
 	"database/sql"
 	"errors"
 	"fmt"
@@ -164,11 +165,13 @@ func SetEngine() (err error) {
 }
 
 // NewEngine initializes a new xorm.Engine
-func NewEngine(migrateFunc func(*xorm.Engine) error) (err error) {
+func NewEngine(ctx context.Context, migrateFunc func(*xorm.Engine) error) (err error) {
 	if err = SetEngine(); err != nil {
 		return err
 	}
 
+	x.SetDefaultContext(ctx)
+
 	if err = x.Ping(); err != nil {
 		return err
 	}