Add optimistic lock to ActionRun table (#26563)

Should fix #26559.

How xorm works: https://xorm.io/docs/chapter-06/1.lock/

---------

Co-authored-by: Giteabot <teabot@gitea.io>

models/actions/run.go

@@ -43,6 +43,7 @@ type ActionRun struct {
 	EventPayload      string                       `xorm:"LONGTEXT"`
 	TriggerEvent      string                       // the trigger event defined in the `on` configuration of the triggered workflow
 	Status            Status                       `xorm:"index"`
+	Version           int                          `xorm:"version default 0"` // Status could be updated concomitantly, so an optimistic lock is needed
 	Started           timeutil.TimeStamp
 	Stopped           timeutil.TimeStamp
 	Created           timeutil.TimeStamp `xorm:"created"`
@@ -332,12 +333,22 @@ func GetRunByIndex(ctx context.Context, repoID, index int64) (*ActionRun, error)
 	return run, nil
 }
 
+// UpdateRun updates a run.
+// It requires the inputted run has Version set.
+// It will return error if the version is not matched (it means the run has been changed after loaded).
 func UpdateRun(ctx context.Context, run *ActionRun, cols ...string) error {
 	sess := db.GetEngine(ctx).ID(run.ID)
 	if len(cols) > 0 {
 		sess.Cols(cols...)
 	}
-	_, err := sess.Update(run)
+	affected, err := sess.Update(run)
+	if err != nil {
+		return err
+	}
+	if affected == 0 {
+		return fmt.Errorf("run has changed")
+		// It's impossible that the run is not found, since Gitea never deletes runs.
+	}
 
 	if run.Status != 0 || util.SliceContains(cols, "status") {
 		if run.RepoID == 0 {
@@ -358,7 +369,7 @@ func UpdateRun(ctx context.Context, run *ActionRun, cols ...string) error {
 		}
 	}
 
-	return err
+	return nil
 }
 
 type ActionRunIndex db.ResourceIndex

models/actions/run_job.go

@@ -114,32 +114,41 @@ func UpdateRunJob(ctx context.Context, job *ActionRunJob, cond builder.Cond, col
 	if affected != 0 && util.SliceContains(cols, "status") && job.Status.IsWaiting() {
 		// if the status of job changes to waiting again, increase tasks version.
 		if err := IncreaseTaskVersion(ctx, job.OwnerID, job.RepoID); err != nil {
-			return affected, err
+			return 0, err
 		}
 	}
 
 	if job.RunID == 0 {
 		var err error
 		if job, err = GetRunJobByID(ctx, job.ID); err != nil {
-			return affected, err
+			return 0, err
 		}
 	}
 
+	{
+		// Other goroutines may aggregate the status of the run and update it too.
+		// So we need load the run and its jobs before updating the run.
+		run, err := GetRunByID(ctx, job.RunID)
+		if err != nil {
+			return 0, err
+		}
 		jobs, err := GetRunJobsByRunID(ctx, job.RunID)
 		if err != nil {
-		return affected, err
+			return 0, err
 		}
-
-	runStatus := aggregateJobStatus(jobs)
-
-	run := &ActionRun{
-		ID:     job.RunID,
-		Status: runStatus,
+		run.Status = aggregateJobStatus(jobs)
+		if run.Started.IsZero() && run.Status.IsRunning() {
+			run.Started = timeutil.TimeStampNow()
 		}
-	if runStatus.IsDone() {
+		if run.Stopped.IsZero() && run.Status.IsDone() {
 			run.Stopped = timeutil.TimeStampNow()
 		}
-	return affected, UpdateRun(ctx, run)
+		if err := UpdateRun(ctx, run, "status", "started", "stopped"); err != nil {
+			return 0, fmt.Errorf("update run %d: %w", run.ID, err)
+		}
+	}
+
+	return affected, nil
 }
 
 func aggregateJobStatus(jobs []*ActionRunJob) Status {

models/actions/task.go

@@ -317,14 +317,6 @@ func CreateTaskForRunner(ctx context.Context, runner *ActionRunner) (*ActionTask
 		return nil, false, nil
 	}
 
-	if job.Run.Status.IsWaiting() {
-		job.Run.Status = StatusRunning
-		job.Run.Started = now
-		if err := UpdateRun(ctx, job.Run, "status", "started"); err != nil {
-			return nil, false, err
-		}
-	}
-
 	task.Job = job
 
 	if err := commiter.Commit(); err != nil {

models/migrations/migrations.go

@@ -524,6 +524,8 @@ var migrations = []Migration{
 	NewMigration("Fix PackageProperty typo", v1_21.FixPackagePropertyTypo),
 	// v271 -> v272
 	NewMigration("Allow archiving labels", v1_21.AddArchivedUnixColumInLabelTable),
+	// v272 -> v273
+	NewMigration("Add Version to ActionRun table", v1_21.AddVersionToActionRunTable),
 }
 
 // GetCurrentDBVersion returns the current db version

models/migrations/v1_21/v272.go

@@ -0,0 +1,14 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_21 //nolint
+import (
+	"xorm.io/xorm"
+)
+
+func AddVersionToActionRunTable(x *xorm.Engine) error {
+	type ActionRun struct {
+		Version int `xorm:"version default 0"`
+	}
+	return x.Sync(new(ActionRun))
+}