fix(preheat):enhance preheat job

- add job stop check points in preheat job
- add missing digest property for the preheat request sent to the provider

Signed-off-by: Steven Zou <szou@vmware.com>

src/controller/p2p/preheat/enforcer.go

@@ -434,6 +434,7 @@ func (de *defaultEnforcer) startTask(ctx context.Context, executionID int64, can
 		},
 		ImageName: fmt.Sprintf("%s/%s", candidate.Namespace, candidate.Repository),
 		Tag:       candidate.Tags[0],
+		Digest:    candidate.Digest,
 	}
 
 	piData, err := pi.ToJSON()

src/pkg/p2p/preheat/job.go

@@ -76,20 +76,34 @@ func (j *Job) Run(ctx job.Context, params job.Parameters) error {
 		return errors.Wrap(err, "preheat job running error")
 	}
 
+	// shouldStop checks if the job should be stopped
+	shouldStop := func() bool {
+		if cmd, ok := ctx.OPCommand(); ok && cmd == job.StopCommand {
+			return true
+		}
+
+		return false
+	}
+
 	// Parse parameters, ignore errors as they have been validated already
 	p, _ := parseParamProvider(params)
 	pi, _ := parseParamImage(params)
 
 	// Print related info to log first
 	myLogger.Infof(
-		"Preheating image '%s:%s' to the target preheat provider: %s %s:%s\n",
+		"Preheating image '%s:%s@%s' to the target preheat provider: %s %s:%s\n",
 		pi.ImageName,
 		pi.Tag,
+		pi.Digest,
 		p.Vendor,
 		p.Name,
 		p.Endpoint,
 	)
 
+	if shouldStop() {
+		return nil
+	}
+
 	// Get driver factory for the given provider
 	fac, ok := pr.GetProvider(p.Vendor)
 	if !ok {
@@ -119,6 +133,10 @@ func (j *Job) Run(ctx job.Context, params job.Parameters) error {
 
 	myLogger.Infof("Check health of preheat provider instance: %s", pr.DriverStatusHealthy)
 
+	if shouldStop() {
+		return nil
+	}
+
 	// Then send the preheat requests to the target provider.
 	st, err := d.Preheat(pi)
 	if err != nil {
@@ -145,6 +163,10 @@ func (j *Job) Run(ctx job.Context, params job.Parameters) error {
 		return preheatJobRunningError(err)
 	}
 
+	if shouldStop() {
+		return nil
+	}
+
 	myLogger.Info("Start to loop check the preheating status until it's success or timeout(30m)")
 	// If process is not completed, loop check the status until it's ready.
 	tk := time.NewTicker(checkInterval)
@@ -167,6 +189,10 @@ func (j *Job) Run(ctx job.Context, params job.Parameters) error {
 			if s.Status == provider.PreheatingStatusSuccess {
 				return nil
 			}
+
+			if shouldStop() {
+				return nil
+			}
 		case <-tm.C:
 			return preheatJobRunningError(errors.Errorf("status check timeout: %v", checkTimeout))
 		}

src/pkg/p2p/preheat/job_test.go

@@ -65,6 +65,7 @@ func (suite *JobTestSuite) SetupSuite() {
 	ctx := &jobservice.MockJobContext{}
 	logger := &jobservice.MockJobLogger{}
 	ctx.On("GetLogger").Return(logger)
+	ctx.On("OPCommand").Return(job.StopCommand, false)
 	suite.context = ctx
 }