feat(RELEASE-913): add GetPreviousRelease loader function

A new funciton has been added to the loader to be able to get the
Release created just before a given Release. This is a key function
for the collectors feature.

Signed-off-by: David Moreno García <[email protected]>

cache/cache.go

@@ -35,6 +35,16 @@ func SetupComponentCache(mgr ctrl.Manager) error {
 		"spec.application", componentIndexFunc)
 }
 
+// SetupReleaseCache adds a new index field to be able to search Releases by ReleasePlan name.
+func SetupReleaseCache(mgr ctrl.Manager) error {
+	releaseIndexFunc := func(obj client.Object) []string {
+		return []string{obj.(*v1alpha1.Release).Spec.ReleasePlan}
+	}
+
+	return mgr.GetCache().IndexField(context.Background(), &v1alpha1.Release{},
+		"spec.releasePlan", releaseIndexFunc)
+}
+
 // SetupReleasePlanCache adds a new index field to be able to search ReleasePlans by target.
 func SetupReleasePlanCache(mgr ctrl.Manager) error {
 	releasePlanIndexFunc := func(obj client.Object) []string {

controllers/release/controller.go

@@ -113,6 +113,9 @@ func (c *Controller) SetupCache(mgr ctrl.Manager) error {
 	if err := cache.SetupComponentCache(mgr); err != nil {
 		return err
 	}
+	if err := cache.SetupReleaseCache(mgr); err != nil {
+		return err
+	}
 
 	// NOTE: Both the release and releaseplan controller need this ReleasePlanAdmission cache. However, it only needs to be added
 	// once to the manager, so only one controller should add it. If it is removed here, it should be added to the ReleasePlan controller.

loader/loader.go

@@ -3,6 +3,8 @@ package loader
 import (
 	"context"
 	"fmt"
+	"k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime/schema"
 	"os"
 	"strings"
 
@@ -29,6 +31,7 @@ type ObjectLoader interface {
 	GetEnterpriseContractPolicy(ctx context.Context, cli client.Client, releasePlanAdmission *v1alpha1.ReleasePlanAdmission) (*ecapiv1alpha1.EnterpriseContractPolicy, error)
 	GetMatchingReleasePlanAdmission(ctx context.Context, cli client.Client, releasePlan *v1alpha1.ReleasePlan) (*v1alpha1.ReleasePlanAdmission, error)
 	GetMatchingReleasePlans(ctx context.Context, cli client.Client, releasePlanAdmission *v1alpha1.ReleasePlanAdmission) (*v1alpha1.ReleasePlanList, error)
+	GetPreviousRelease(ctx context.Context, cli client.Client, release *v1alpha1.Release) (*v1alpha1.Release, error)
 	GetRelease(ctx context.Context, cli client.Client, name, namespace string) (*v1alpha1.Release, error)
 	GetRoleBindingFromReleaseStatus(ctx context.Context, cli client.Client, release *v1alpha1.Release) (*rbac.RoleBinding, error)
 	GetReleasePipelineRun(ctx context.Context, cli client.Client, release *v1alpha1.Release) (*tektonv1.PipelineRun, error)
@@ -170,6 +173,42 @@ func (l *loader) GetMatchingReleasePlans(ctx context.Context, cli client.Client,
 	return releasePlans, nil
 }
 
+// GetPreviousRelease returns the Release that was created just before the given Release.
+// If no previous Release is found, a NotFound error is returned.
+func (l *loader) GetPreviousRelease(ctx context.Context, cli client.Client, release *v1alpha1.Release) (*v1alpha1.Release, error) {
+	releases := &v1alpha1.ReleaseList{}
+	err := cli.List(ctx, releases,
+		client.InNamespace(release.Namespace),
+		client.MatchingFields{"spec.releasePlan": release.Spec.ReleasePlan})
+	if err != nil {
+		return nil, err
+	}
+
+	var previousRelease *v1alpha1.Release
+
+	// Find the previous release
+	for i, possiblePreviousRelease := range releases.Items {
+		// Ignore the release passed as argument and any release created after that one
+		if possiblePreviousRelease.Name == release.Name ||
+			possiblePreviousRelease.CreationTimestamp.After(release.CreationTimestamp.Time) {
+			continue
+		}
+		if previousRelease == nil || possiblePreviousRelease.CreationTimestamp.After(previousRelease.CreationTimestamp.Time) {
+			previousRelease = &releases.Items[i]
+		}
+	}
+
+	if previousRelease == nil {
+		return nil, errors.NewNotFound(
+			schema.GroupResource{
+				Group:    v1alpha1.GroupVersion.Group,
+				Resource: release.GetObjectKind().GroupVersionKind().Kind,
+			}, release.Name)
+	}
+
+	return previousRelease, nil
+}
+
 // GetRelease returns the Release with the given name and namespace. If the Release is not found or the Get operation
 // fails, an error will be returned.
 func (l *loader) GetRelease(ctx context.Context, cli client.Client, name, namespace string) (*v1alpha1.Release, error) {

loader/loader_mock.go

@@ -21,6 +21,7 @@ const (
 	EnterpriseContractPolicyContextKey
 	MatchedReleasePlansContextKey
 	MatchedReleasePlanAdmissionContextKey
+	PreviousReleaseContextKey
 	ProcessingResourcesContextKey
 	ReleaseContextKey
 	ReleasePipelineRunContextKey
@@ -97,6 +98,14 @@ func (l *mockLoader) GetMatchingReleasePlans(ctx context.Context, cli client.Cli
 	return toolkit.GetMockedResourceAndErrorFromContext(ctx, MatchedReleasePlansContextKey, &v1alpha1.ReleasePlanList{})
 }
 
+// GetPreviousRelease returns the resource and error passed as values of the context.
+func (l *mockLoader) GetPreviousRelease(ctx context.Context, cli client.Client, release *v1alpha1.Release) (*v1alpha1.Release, error) {
+	if ctx.Value(PreviousReleaseContextKey) == nil {
+		return l.loader.GetPreviousRelease(ctx, cli, release)
+	}
+	return toolkit.GetMockedResourceAndErrorFromContext(ctx, PreviousReleaseContextKey, &v1alpha1.Release{})
+}
+
 // GetRelease returns the resource and error passed as values of the context.
 func (l *mockLoader) GetRelease(ctx context.Context, cli client.Client, name, namespace string) (*v1alpha1.Release, error) {
 	if ctx.Value(ReleaseContextKey) == nil {

loader/loader_mock_test.go

@@ -111,6 +111,21 @@ var _ = Describe("Release Adapter", Ordered, func() {
 		})
 	})
 
+	When("calling GetPreviousRelease", func() {
+		It("returns the resource and error from the context", func() {
+			release := &v1alpha1.Release{}
+			mockContext := toolkit.GetMockedContext(ctx, []toolkit.MockData{
+				{
+					ContextKey: PreviousReleaseContextKey,
+					Resource:   release,
+				},
+			})
+			resource, err := loader.GetPreviousRelease(mockContext, nil, release)
+			Expect(resource).To(Equal(release))
+			Expect(err).To(BeNil())
+		})
+	})
+
 	When("calling GetRelease", func() {
 		It("returns the resource and error from the context", func() {
 			release := &v1alpha1.Release{}

loader/loader_test.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"strings"
+	"time"
 
 	tektonutils "github.com/konflux-ci/release-service/tekton/utils"
 
@@ -20,6 +21,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
 )
 
 var _ = Describe("Release Adapter", Ordered, func() {
@@ -238,6 +240,83 @@ var _ = Describe("Release Adapter", Ordered, func() {
 		})
 	})
 
+	When("calling GetPreviousRelease", func() {
+		var newerRelease, mostRecentRelease *v1alpha1.Release
+
+		AfterEach(func() {
+			k8sClient.Delete(ctx, newerRelease)
+			k8sClient.Delete(ctx, mostRecentRelease)
+
+			// Wait until the releases are gone
+			Eventually(func() bool {
+				releases := &v1alpha1.ReleaseList{}
+				err := k8sClient.List(ctx, releases,
+					client.InNamespace(release.Namespace),
+					client.MatchingFields{"spec.releasePlan": release.Spec.ReleasePlan})
+				return err == nil && len(releases.Items) == 1
+			}).Should(BeTrue())
+		})
+
+		It("returns a NotFound error if no previous release is found", func() {
+			returnedObject, err := loader.GetPreviousRelease(ctx, k8sClient, release)
+			Expect(err).To(HaveOccurred())
+			Expect(errors.IsNotFound(err)).To(BeTrue())
+			Expect(returnedObject).To(BeNil())
+		})
+
+		It("returns the previous release if found", func() {
+			// We need a new release with a more recent creation timestamp
+			time.Sleep(1 * time.Second)
+
+			newerRelease = release.DeepCopy()
+			newerRelease.Name = "newer-release"
+			newerRelease.ResourceVersion = ""
+			Expect(k8sClient.Create(ctx, newerRelease)).To(Succeed())
+
+			// Wait until the new release is cached
+			Eventually(func() error {
+				return k8sClient.Get(ctx, client.ObjectKey{Name: newerRelease.Name, Namespace: newerRelease.Namespace}, newerRelease)
+			}).Should(Succeed())
+
+			returnedObject, err := loader.GetPreviousRelease(ctx, k8sClient, newerRelease)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(returnedObject).ToNot(BeNil())
+			Expect(returnedObject.Name).To(Equal(release.Name))
+		})
+
+		It("returns the previous release if multiple releases are found", func() {
+			// We need two new releases with a more recent creation timestamp
+			time.Sleep(1 * time.Second)
+
+			newerRelease = release.DeepCopy()
+			newerRelease.Name = "newer-release"
+			newerRelease.ResourceVersion = ""
+			Expect(k8sClient.Create(ctx, newerRelease)).To(Succeed())
+
+			// Wait until the new release is cached
+			Eventually(func() error {
+				return k8sClient.Get(ctx, client.ObjectKey{Name: newerRelease.Name, Namespace: newerRelease.Namespace}, newerRelease)
+			}).Should(Succeed())
+
+			time.Sleep(1 * time.Second)
+
+			mostRecentRelease = release.DeepCopy()
+			mostRecentRelease.Name = "most-recent-release"
+			mostRecentRelease.ResourceVersion = ""
+			Expect(k8sClient.Create(ctx, mostRecentRelease)).To(Succeed())
+
+			// Wait until the new release is cached
+			Eventually(func() error {
+				return k8sClient.Get(ctx, client.ObjectKey{Name: mostRecentRelease.Name, Namespace: mostRecentRelease.Namespace}, mostRecentRelease)
+			}).Should(Succeed())
+
+			returnedObject, err := loader.GetPreviousRelease(ctx, k8sClient, mostRecentRelease)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(returnedObject).ToNot(BeNil())
+			Expect(returnedObject.Name).To(Equal(newerRelease.Name))
+		})
+	})
+
 	When("calling GetRelease", func() {
 		It("returns the requested release", func() {
 			returnedObject, err := loader.GetRelease(ctx, k8sClient, release.Name, release.Namespace)

loader/suite_test.go

@@ -110,6 +110,7 @@ var _ = BeforeSuite(func() {
 		defer GinkgoRecover()
 
 		Expect(cache.SetupComponentCache(mgr)).To(Succeed())
+		Expect(cache.SetupReleaseCache(mgr)).To(Succeed())
 		Expect(cache.SetupReleasePlanCache(mgr)).To(Succeed())
 		Expect(cache.SetupReleasePlanAdmissionCache(mgr)).To(Succeed())