Merge pull request #25569 from soltysh/scheduledjob_storage

Automatic merge from submit-queue

Scheduledjob storage

This builds on top of #25475 so only last commit is significant. There's still one small problem with conversions, I'm currently working, but the biggest is still multi-version client tests. Read on...

@erictune unfortunately the multi-version tests are biting again, this time in `pkg/registry/scheduledjob/etcd`. If I run the tests with just `batch/v2alpha1` then these are working correctly, but we can't have only `batch/v2alpha1` enabled since `batch/v1` is the preferred version for the entire `batch/` group. We either going to skip the tests here like we did with the scheduledjob client (I'm talking about `pkg/registry/scheduledjob/etcd/etcd_test.go`) or fix it. 

I've talked with @deads2k about how we can plumb the tests so it just passes, but there's no simple solution we can come up with 😞 (other than the one from #25566), unless @caesarxuchao can chime in and propose something.

```release-note
Introducing ScheduledJobs as described in [the proposal](https://github.com/kubernetes/kubernetes/blob/master/docs/proposals/scheduledjob.md) as part of `batch/v2alpha1` version (experimental feature).
```
[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/.github/PULL_REQUEST_TEMPLATE.md?pixel)]()

pkg/apis/batch/v2alpha1/conversion.go

@@ -39,15 +39,18 @@ func addConversionFuncs(scheme *runtime.Scheme) {
 		panic(err)
 	}
 
-	err = api.Scheme.AddFieldLabelConversionFunc("batch/v2alpha1", "Job",
-		func(label, value string) (string, string, error) {
-			switch label {
-			case "metadata.name", "metadata.namespace", "status.successful":
-				return label, value, nil
-			default:
-				return "", "", fmt.Errorf("field label not supported: %s", label)
-			}
-		})
+	// Add field label conversions for kinds having selectable nothing but ObjectMeta fields.
+	for _, kind := range []string{"Job", "JobTemplate", "ScheduledJob"} {
+		err = api.Scheme.AddFieldLabelConversionFunc("batch/v2alpha1", kind,
+			func(label, value string) (string, string, error) {
+				switch label {
+				case "metadata.name", "metadata.namespace", "status.successful":
+					return label, value, nil
+				default:
+					return "", "", fmt.Errorf("field label not supported: %s", label)
+				}
+			})
+	}
 	if err != nil {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)

pkg/registry/cachesize/cachesize.go

@@ -47,6 +47,7 @@ const (
 	PodTemplates             Resource = "podtemplates"
 	Replicasets              Resource = "replicasets"
 	ResourceQuotas           Resource = "resourcequotas"
+	ScheduledJobs            Resource = "scheduledjobs"
 	Secrets                  Resource = "secrets"
 	ServiceAccounts          Resource = "serviceaccounts"
 	Services                 Resource = "services"
@@ -75,6 +76,7 @@ func init() {
 	watchCacheSizes[PodTemplates] = 100
 	watchCacheSizes[Replicasets] = 100
 	watchCacheSizes[ResourceQuotas] = 100
+	watchCacheSizes[ScheduledJobs] = 100
 	watchCacheSizes[Secrets] = 100
 	watchCacheSizes[ServiceAccounts] = 100
 	watchCacheSizes[Services] = 100

pkg/registry/scheduledjob/doc.go

@@ -0,0 +1,19 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 scheduledjob provides Registry interface and it's RESTStorage
+// implementation for storing ScheduledJob api objects.
+package scheduledjob

pkg/registry/scheduledjob/etcd/etcd.go

@@ -0,0 +1,98 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 etcd
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/apis/batch"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/cachesize"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/registry/generic/registry"
+	"k8s.io/kubernetes/pkg/registry/scheduledjob"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+// REST implements a RESTStorage for scheduled jobs against etcd
+type REST struct {
+	*registry.Store
+}
+
+// NewREST returns a RESTStorage object that will work against ScheduledJobs.
+func NewREST(opts generic.RESTOptions) (*REST, *StatusREST) {
+	prefix := "/scheduledjobs"
+
+	newListFunc := func() runtime.Object { return &batch.ScheduledJobList{} }
+	storageInterface := opts.Decorator(
+		opts.Storage, cachesize.GetWatchCacheSizeByResource(cachesize.ScheduledJobs), &batch.ScheduledJob{}, prefix, scheduledjob.Strategy, newListFunc)
+
+	store := &registry.Store{
+		NewFunc: func() runtime.Object { return &batch.ScheduledJob{} },
+
+		// NewListFunc returns an object capable of storing results of an etcd list.
+		NewListFunc: newListFunc,
+		// Produces a path that etcd understands, to the root of the resource
+		// by combining the namespace in the context with the given prefix
+		KeyRootFunc: func(ctx api.Context) string {
+			return registry.NamespaceKeyRootFunc(ctx, prefix)
+		},
+		// Produces a path that etcd understands, to the resource by combining
+		// the namespace in the context with the given prefix
+		KeyFunc: func(ctx api.Context, name string) (string, error) {
+			return registry.NamespaceKeyFunc(ctx, prefix, name)
+		},
+		// Retrieve the name field of a scheduled job
+		ObjectNameFunc: func(obj runtime.Object) (string, error) {
+			return obj.(*batch.ScheduledJob).Name, nil
+		},
+		// Used to match objects based on labels/fields for list and watch
+		PredicateFunc: func(label labels.Selector, field fields.Selector) generic.Matcher {
+			return scheduledjob.MatchScheduledJob(label, field)
+		},
+		QualifiedResource:       batch.Resource("scheduledjobs"),
+		DeleteCollectionWorkers: opts.DeleteCollectionWorkers,
+
+		// Used to validate scheduled job creation
+		CreateStrategy: scheduledjob.Strategy,
+
+		// Used to validate scheduled job updates
+		UpdateStrategy: scheduledjob.Strategy,
+		DeleteStrategy: scheduledjob.Strategy,
+
+		Storage: storageInterface,
+	}
+
+	statusStore := *store
+	statusStore.UpdateStrategy = scheduledjob.StatusStrategy
+
+	return &REST{store}, &StatusREST{store: &statusStore}
+}
+
+// StatusREST implements the REST endpoint for changing the status of a resourcequota.
+type StatusREST struct {
+	store *registry.Store
+}
+
+func (r *StatusREST) New() runtime.Object {
+	return &batch.ScheduledJob{}
+}
+
+// Update alters the status subset of an object.
+func (r *StatusREST) Update(ctx api.Context, obj runtime.Object) (runtime.Object, bool, error) {
+	return r.store.Update(ctx, obj)
+}

pkg/registry/scheduledjob/strategy.go

@@ -0,0 +1,119 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 scheduledjob
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/apis/batch"
+	"k8s.io/kubernetes/pkg/apis/batch/validation"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/util/validation/field"
+)
+
+// scheduledJobStrategy implements verification logic for Replication Controllers.
+type scheduledJobStrategy struct {
+	runtime.ObjectTyper
+	api.NameGenerator
+}
+
+// Strategy is the default logic that applies when creating and updating ScheduledJob objects.
+var Strategy = scheduledJobStrategy{api.Scheme, api.SimpleNameGenerator}
+
+// NamespaceScoped returns true because all scheduled jobs need to be within a namespace.
+func (scheduledJobStrategy) NamespaceScoped() bool {
+	return true
+}
+
+// PrepareForCreate clears the status of a scheduled job before creation.
+func (scheduledJobStrategy) PrepareForCreate(obj runtime.Object) {
+	scheduledJob := obj.(*batch.ScheduledJob)
+	scheduledJob.Status = batch.ScheduledJobStatus{}
+}
+
+// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
+func (scheduledJobStrategy) PrepareForUpdate(obj, old runtime.Object) {
+	newScheduledJob := obj.(*batch.ScheduledJob)
+	oldScheduledJob := old.(*batch.ScheduledJob)
+	newScheduledJob.Status = oldScheduledJob.Status
+}
+
+// Validate validates a new scheduled job.
+func (scheduledJobStrategy) Validate(ctx api.Context, obj runtime.Object) field.ErrorList {
+	scheduledJob := obj.(*batch.ScheduledJob)
+	return validation.ValidateScheduledJob(scheduledJob)
+}
+
+// Canonicalize normalizes the object after validation.
+func (scheduledJobStrategy) Canonicalize(obj runtime.Object) {
+}
+
+func (scheduledJobStrategy) AllowUnconditionalUpdate() bool {
+	return true
+}
+
+// AllowCreateOnUpdate is false for scheduled jobs; this means a POST is needed to create one.
+func (scheduledJobStrategy) AllowCreateOnUpdate() bool {
+	return false
+}
+
+// ValidateUpdate is the default update validation for an end user.
+func (scheduledJobStrategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) field.ErrorList {
+	return validation.ValidateScheduledJob(obj.(*batch.ScheduledJob))
+}
+
+type scheduledJobStatusStrategy struct {
+	scheduledJobStrategy
+}
+
+var StatusStrategy = scheduledJobStatusStrategy{Strategy}
+
+func (scheduledJobStatusStrategy) PrepareForUpdate(obj, old runtime.Object) {
+	newJob := obj.(*batch.ScheduledJob)
+	oldJob := old.(*batch.ScheduledJob)
+	newJob.Spec = oldJob.Spec
+}
+
+func (scheduledJobStatusStrategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) field.ErrorList {
+	return field.ErrorList{}
+}
+
+// ScheduledJobToSelectableFields returns a field set that represents the object for matching purposes.
+func ScheduledJobToSelectableFields(scheduledJob *batch.ScheduledJob) fields.Set {
+	return generic.ObjectMetaFieldsSet(scheduledJob.ObjectMeta, true)
+}
+
+// MatchScheduledJob is the filter used by the generic etcd backend to route
+// watch events from etcd to clients of the apiserver only interested in specific
+// labels/fields.
+func MatchScheduledJob(label labels.Selector, field fields.Selector) generic.Matcher {
+	return &generic.SelectionPredicate{
+		Label: label,
+		Field: field,
+		GetAttrs: func(obj runtime.Object) (labels.Set, fields.Set, error) {
+			scheduledJob, ok := obj.(*batch.ScheduledJob)
+			if !ok {
+				return nil, nil, fmt.Errorf("Given object is not a scheduled job.")
+			}
+			return labels.Set(scheduledJob.ObjectMeta.Labels), ScheduledJobToSelectableFields(scheduledJob), nil
+		},
+	}
+}

pkg/registry/scheduledjob/strategy_test.go

@@ -0,0 +1,192 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 scheduledjob
+
+import (
+	"testing"
+
+	"k8s.io/kubernetes/pkg/api"
+	apitesting "k8s.io/kubernetes/pkg/api/testing"
+	"k8s.io/kubernetes/pkg/api/unversioned"
+	"k8s.io/kubernetes/pkg/apis/batch"
+	"k8s.io/kubernetes/pkg/labels"
+)
+
+func newBool(a bool) *bool {
+	r := new(bool)
+	*r = a
+	return r
+}
+
+func TestScheduledJobStrategy(t *testing.T) {
+	ctx := api.NewDefaultContext()
+	if !Strategy.NamespaceScoped() {
+		t.Errorf("ScheduledJob must be namespace scoped")
+	}
+	if Strategy.AllowCreateOnUpdate() {
+		t.Errorf("ScheduledJob should not allow create on update")
+	}
+
+	validSelector := &unversioned.LabelSelector{
+		MatchLabels: map[string]string{"a": "b"},
+	}
+	validPodTemplateSpec := api.PodTemplateSpec{
+		ObjectMeta: api.ObjectMeta{
+			Labels: validSelector.MatchLabels,
+		},
+		Spec: api.PodSpec{
+			RestartPolicy: api.RestartPolicyOnFailure,
+			DNSPolicy:     api.DNSClusterFirst,
+			Containers:    []api.Container{{Name: "abc", Image: "image", ImagePullPolicy: "IfNotPresent"}},
+		},
+	}
+	scheduledJob := &batch.ScheduledJob{
+		ObjectMeta: api.ObjectMeta{
+			Name:      "myscheduledjob",
+			Namespace: api.NamespaceDefault,
+		},
+		Spec: batch.ScheduledJobSpec{
+			Schedule:          "* * * * * ?",
+			ConcurrencyPolicy: batch.AllowConcurrent,
+			JobTemplate: batch.JobTemplateSpec{
+				Spec: batch.JobSpec{
+					Selector:       validSelector,
+					Template:       validPodTemplateSpec,
+					ManualSelector: newBool(true),
+				},
+			},
+		},
+	}
+
+	Strategy.PrepareForCreate(scheduledJob)
+	if len(scheduledJob.Status.Active) != 0 {
+		t.Errorf("ScheduledJob does not allow setting status on create")
+	}
+	errs := Strategy.Validate(ctx, scheduledJob)
+	if len(errs) != 0 {
+		t.Errorf("Unexpected error validating %v", errs)
+	}
+	now := unversioned.Now()
+	updatedScheduledJob := &batch.ScheduledJob{
+		ObjectMeta: api.ObjectMeta{Name: "bar", ResourceVersion: "4"},
+		Spec: batch.ScheduledJobSpec{
+			Schedule: "5 5 5 5 * ?",
+		},
+		Status: batch.ScheduledJobStatus{
+			LastScheduleTime: &now,
+		},
+	}
+
+	// ensure we do not change status
+	Strategy.PrepareForUpdate(updatedScheduledJob, scheduledJob)
+	if updatedScheduledJob.Status.Active != nil {
+		t.Errorf("PrepareForUpdate should have preserved prior version status")
+	}
+	errs = Strategy.ValidateUpdate(ctx, updatedScheduledJob, scheduledJob)
+	if len(errs) == 0 {
+		t.Errorf("Expected a validation error")
+	}
+}
+
+func TestScheduledJobStatusStrategy(t *testing.T) {
+	ctx := api.NewDefaultContext()
+	if !StatusStrategy.NamespaceScoped() {
+		t.Errorf("ScheduledJob must be namespace scoped")
+	}
+	if StatusStrategy.AllowCreateOnUpdate() {
+		t.Errorf("ScheduledJob should not allow create on update")
+	}
+	validSelector := &unversioned.LabelSelector{
+		MatchLabels: map[string]string{"a": "b"},
+	}
+	validPodTemplateSpec := api.PodTemplateSpec{
+		ObjectMeta: api.ObjectMeta{
+			Labels: validSelector.MatchLabels,
+		},
+		Spec: api.PodSpec{
+			RestartPolicy: api.RestartPolicyOnFailure,
+			DNSPolicy:     api.DNSClusterFirst,
+			Containers:    []api.Container{{Name: "abc", Image: "image", ImagePullPolicy: "IfNotPresent"}},
+		},
+	}
+	oldSchedule := "* * * * * ?"
+	oldScheduledJob := &batch.ScheduledJob{
+		ObjectMeta: api.ObjectMeta{
+			Name:            "myscheduledjob",
+			Namespace:       api.NamespaceDefault,
+			ResourceVersion: "10",
+		},
+		Spec: batch.ScheduledJobSpec{
+			Schedule:          oldSchedule,
+			ConcurrencyPolicy: batch.AllowConcurrent,
+			JobTemplate: batch.JobTemplateSpec{
+				Spec: batch.JobSpec{
+					Selector:       validSelector,
+					Template:       validPodTemplateSpec,
+					ManualSelector: newBool(true),
+				},
+			},
+		},
+	}
+	now := unversioned.Now()
+	newScheduledJob := &batch.ScheduledJob{
+		ObjectMeta: api.ObjectMeta{
+			Name:            "myscheduledjob",
+			Namespace:       api.NamespaceDefault,
+			ResourceVersion: "9",
+		},
+		Spec: batch.ScheduledJobSpec{
+			Schedule:          "5 5 5 * * ?",
+			ConcurrencyPolicy: batch.AllowConcurrent,
+			JobTemplate: batch.JobTemplateSpec{
+				Spec: batch.JobSpec{
+					Selector:       validSelector,
+					Template:       validPodTemplateSpec,
+					ManualSelector: newBool(true),
+				},
+			},
+		},
+		Status: batch.ScheduledJobStatus{
+			LastScheduleTime: &now,
+		},
+	}
+
+	StatusStrategy.PrepareForUpdate(newScheduledJob, oldScheduledJob)
+	if newScheduledJob.Status.LastScheduleTime == nil {
+		t.Errorf("ScheduledJob status updates must allow changes to scheduledJob status")
+	}
+	if newScheduledJob.Spec.Schedule != oldSchedule {
+		t.Errorf("ScheduledJob status updates must now allow changes to scheduledJob spec")
+	}
+	errs := StatusStrategy.ValidateUpdate(ctx, newScheduledJob, oldScheduledJob)
+	if len(errs) != 0 {
+		t.Errorf("Unexpected error %v", errs)
+	}
+	if newScheduledJob.ResourceVersion != "9" {
+		t.Errorf("Incoming resource version on update should not be mutated")
+	}
+}
+
+// FIXME: this is failing conversion.go
+func TestSelectableFieldLabelConversions(t *testing.T) {
+	apitesting.TestSelectableFieldLabelConversionsOfKind(t,
+		"batch/v2alpha1",
+		"ScheduledJob",
+		labels.Set(ScheduledJobToSelectableFields(&batch.ScheduledJob{})),
+		nil,
+	)
+}