Implement GenericJob interface on batchv1.Job

# Conflicts:
#	pkg/controller/workload/job/job_controller.go
#	test/integration/controller/job/job_controller_test.go

Original commit by Kante Yin "Implement genericjob interface on batchv1.Job":
ebf2b81

Cherry-picked and conflicts resolution by Michal Wozniak <mw219725@gmail.com>

Co-authored-by: Kante Yin <kerthcet@gmail.com>
Co-authored-by: Michal Wozniak <mw219725@gmail.com>

# Conflicts:
#	pkg/controller/workload/job/job_controller.go

pkg/controller/workload/job/helpers.go

@@ -0,0 +1,267 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package job
+
+import (
+	"context"
+	"fmt"
+
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	apimeta "k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/client-go/tools/record"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	kueue "sigs.k8s.io/kueue/apis/kueue/v1beta1"
+	utilpriority "sigs.k8s.io/kueue/pkg/util/priority"
+	"sigs.k8s.io/kueue/pkg/workload"
+)
+
+// EnsureOneWorkload will query for the single matched workload corresponding to job and return it.
+// If there're more than one workload, we should delete the excess ones.
+// The returned workload could be nil.
+func EnsureOneWorkload(ctx context.Context, cli client.Client, req ctrl.Request, record record.EventRecorder, job GenericJob) (*kueue.Workload, error) {
+	log := ctrl.LoggerFrom(ctx)
+
+	// Find a matching workload first if there is one.
+	var toDelete []*kueue.Workload
+	var match *kueue.Workload
+
+	if pwName := job.ParentWorkloadName(); pwName != "" {
+		pw := kueue.Workload{}
+		NamespacedName := types.NamespacedName{
+			Name:      pwName,
+			Namespace: job.Object().GetNamespace(),
+		}
+		if err := cli.Get(ctx, NamespacedName, &pw); err != nil {
+			if !apierrors.IsNotFound(err) {
+				return nil, err
+			}
+			log.V(2).Info("job with no matching parent workload", "parent-workload", pwName)
+		} else {
+			match = &pw
+		}
+	}
+
+	var workloads kueue.WorkloadList
+	if err := cli.List(ctx, &workloads, client.InNamespace(job.Object().GetNamespace()),
+		client.MatchingFields{ownerKey: job.Object().GetName()}); err != nil {
+		log.Error(err, "Unable to list child workloads")
+		return nil, err
+	}
+
+	for i := range workloads.Items {
+		w := &workloads.Items[i]
+		owner := metav1.GetControllerOf(w)
+		// Indexes don't work in unit tests, so we explicitly check for the
+		// owner here.
+		if owner.Name != job.Object().GetName() {
+			continue
+		}
+		if match == nil && job.EquivalentToWorkload(*w) {
+			match = w
+		} else {
+			toDelete = append(toDelete, w)
+		}
+	}
+
+	// If there is no matching workload and the job is running, suspend it.
+	if match == nil && !job.IsSuspend() {
+		log.V(2).Info("job with no matching workload, suspending")
+		var w *kueue.Workload
+		if len(workloads.Items) == 1 {
+			// The job may have been modified and hence the existing workload
+			// doesn't match the job anymore. All bets are off if there are more
+			// than one workload...
+			w = &workloads.Items[0]
+		}
+		if err := StopJob(ctx, cli, record, job, w, "No matching Workload"); err != nil {
+			log.Error(err, "stopping job")
+		}
+	}
+
+	// Delete duplicate workload instances.
+	existedWls := 0
+	for i := range toDelete {
+		err := cli.Delete(ctx, toDelete[i])
+		if err == nil || !apierrors.IsNotFound(err) {
+			existedWls++
+		}
+		if err != nil && !apierrors.IsNotFound(err) {
+			log.Error(err, "Failed to delete workload")
+		}
+		if err == nil {
+			record.Eventf(job.Object(), corev1.EventTypeNormal, "DeletedWorkload",
+				"Deleted not matching Workload: %v", workload.Key(toDelete[i]))
+		}
+	}
+
+	if existedWls != 0 {
+		if match == nil {
+			return nil, fmt.Errorf("no matching workload was found, tried deleting %d existing workload(s)", existedWls)
+		}
+		return nil, fmt.Errorf("only one workload should exist, found %d", len(workloads.Items))
+	}
+
+	return match, nil
+}
+
+// StartJob will unsuspend the job, and also inject the node affinity.
+func StartJob(ctx context.Context, client client.Client, record record.EventRecorder, job GenericJob, wl *kueue.Workload) error {
+	nodeSelectors, err := GetNodeSelectors(ctx, client, wl)
+	if err != nil {
+		return err
+	}
+
+	if err := job.InjectNodeAffinity(nodeSelectors); err != nil {
+		return err
+	}
+
+	if err := job.UnSuspend(); err != nil {
+		return err
+	}
+
+	if err := client.Update(ctx, job.Object()); err != nil {
+		return err
+	}
+
+	record.Eventf(job.Object(), corev1.EventTypeNormal, "Started",
+		"Admitted by clusterQueue %v", wl.Status.Admission.ClusterQueue)
+
+	return nil
+}
+
+// StopJob will suspend the job, and also restore node affinity, reset job status if needed.
+func StopJob(ctx context.Context, client client.Client, record record.EventRecorder, job GenericJob, wl *kueue.Workload, eventMsg string) error {
+	// Suspend the job at first then we're able to update the scheduling directives.
+	if err := job.Suspend(); err != nil {
+		return err
+	}
+
+	if err := client.Update(ctx, job.Object()); err != nil {
+		return err
+	}
+
+	record.Eventf(job.Object(), corev1.EventTypeNormal, "Stopped", eventMsg)
+
+	if job.ResetStatus() {
+		if err := client.Status().Update(ctx, job.Object()); err != nil {
+			return err
+		}
+	}
+
+	if wl != nil {
+		if err := job.RestoreNodeAffinity([]map[string]string{wl.Spec.PodSets[0].Template.Spec.NodeSelector}); err != nil {
+			return err
+		}
+		return client.Update(ctx, job.Object())
+	}
+
+	return nil
+}
+
+// CreateWorkload will create a workload from the corresponding job.
+func CreateWorkload(ctx context.Context, client client.Client, scheme *runtime.Scheme, job GenericJob) (*kueue.Workload, error) {
+	wl, err := ConstructWorkload(ctx, client, scheme, job)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = client.Create(ctx, wl); err != nil {
+		return nil, err
+	}
+
+	return wl, nil
+}
+
+// ConstructWorkload will derive a workload from the corresponding job.
+func ConstructWorkload(ctx context.Context, client client.Client, scheme *runtime.Scheme, job GenericJob) (*kueue.Workload, error) {
+	wl := &kueue.Workload{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      GetWorkloadNameForJob(job.Object().GetName()),
+			Namespace: job.Object().GetNamespace(),
+		},
+		Spec: kueue.WorkloadSpec{
+			PodSets:   job.PodSets(),
+			QueueName: job.QueueName(),
+		},
+	}
+
+	priorityClassName, p, err := utilpriority.GetPriorityFromPriorityClass(
+		ctx, client, job.PriorityClass())
+	if err != nil {
+		return nil, err
+	}
+
+	wl.Spec.PriorityClassName = priorityClassName
+	wl.Spec.Priority = &p
+
+	if err := ctrl.SetControllerReference(job.Object(), wl, scheme); err != nil {
+		return nil, err
+	}
+	return wl, nil
+}
+
+// GetNodeSelectors will extract node selectors from admitted workloads.
+func GetNodeSelectors(ctx context.Context, client client.Client, w *kueue.Workload) ([]map[string]string, error) {
+	if len(w.Status.Admission.PodSetFlavors) == 0 {
+		return nil, nil
+	}
+
+	nodeSelectors := make([]map[string]string, len(w.Status.Admission.PodSetFlavors))
+
+	for i, podSetFlavor := range w.Status.Admission.PodSetFlavors {
+		processedFlvs := sets.NewString()
+		nodeSelector := map[string]string{}
+		for _, flvRef := range podSetFlavor.Flavors {
+			flvName := string(flvRef)
+			if processedFlvs.Has(flvName) {
+				continue
+			}
+			// Lookup the ResourceFlavors to fetch the node affinity labels to apply on the job.
+			flv := kueue.ResourceFlavor{}
+			if err := client.Get(ctx, types.NamespacedName{Name: string(flvName)}, &flv); err != nil {
+				return nil, err
+			}
+			for k, v := range flv.Spec.NodeLabels {
+				nodeSelector[k] = v
+			}
+			processedFlvs.Insert(flvName)
+		}
+
+		nodeSelectors[i] = nodeSelector
+	}
+	return nodeSelectors, nil
+}
+
+// UpdateQueueNameIfChanged will update workload queue name if changed.
+func UpdateQueueNameIfChanged(ctx context.Context, client client.Client, job GenericJob, wl *kueue.Workload) error {
+	queueName := job.QueueName()
+	if wl.Spec.QueueName != queueName {
+		wl.Spec.QueueName = queueName
+		return client.Update(ctx, wl)
+	}
+	return nil
+}
+
+// SetWorkloadCondition will update the workload condition by the provide one.
+func SetWorkloadCondition(ctx context.Context, client client.Client, wl *kueue.Workload, condition metav1.Condition) error {
+	apimeta.SetStatusCondition(&wl.Status.Conditions, condition)
+	return client.Status().Update(ctx, wl)
+}

pkg/controller/workload/job/interface.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package job
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	kueue "sigs.k8s.io/kueue/apis/kueue/v1beta1"
+)
+
+type GenericJob interface {
+	// Object returns the job instance.
+	Object() client.Object
+	// IsSuspend returns whether the job is suspended or not.
+	IsSuspend() bool
+	// Suspend will suspend the job.
+	Suspend() error
+	// UnSuspend will unsuspend the job.
+	UnSuspend() error
+	// ResetStatus will reset the job status to the original state.
+	// If true, status is modified, if not, status is as it was.
+	ResetStatus() bool
+	// InjectNodeAffinity will inject the node affinity extracting from workload to job.
+	InjectNodeAffinity(nodeSelectors []map[string]string) error
+	// RestoreNodeAffinity will restore the original node affinity of job.
+	RestoreNodeAffinity(nodeSelectors []map[string]string) error
+	// Finished means whether the job is completed/failed or not,
+	// condition represents the workload finished condition.
+	Finished() (condition metav1.Condition, finished bool)
+	// PodSets will build workload podSets corresponding to the job.
+	PodSets() []kueue.PodSet
+	// EquivalentToWorkload validates whether the workload is semantically equal to the job.
+	EquivalentToWorkload(wl kueue.Workload) bool
+	// PriorityClass returns the job's priority class name.
+	PriorityClass() string
+	// QueueName returns the queue name the job enqueued.
+	QueueName() string
+	// ParentWorkloadName returns the parent workload name.
+	ParentWorkloadName() string
+	// IsActive returns true if there are any running pods.
+	IsActive() bool
+	// PodsReady instructs whether job derived pods are all ready now.
+	PodsReady() bool
+}