refactor: return error when project specified cc does not exist

Signed-off-by: Nick Hale <4175918+njhale@users.noreply.github.com>

pkg/apis/internal.admin.acorn.io/v1/default.go

@@ -7,21 +7,62 @@ import (
 
 	internalv1 "github.com/acorn-io/runtime/pkg/apis/internal.acorn.io/v1"
 	"github.com/acorn-io/z"
-	"k8s.io/apimachinery/pkg/util/sets"
-	"sigs.k8s.io/controller-runtime/pkg/client"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	kclient "sigs.k8s.io/controller-runtime/pkg/client"
 )
 
-func getCurrentClusterComputeClassDefault(ctx context.Context, c client.Client, projectSpecified string) (*ClusterComputeClassInstance, error) {
+// GetDefaultComputeClassName gets the name of the effective default ComputeClass for a given project namespace.
+// The precedence for picking the default ComputeClass is as follows:
+//  1. Any ProjectComputeClassInstance (in the project namespace) or ClusterComputeClassInstance that is specified by the
+//     ProjectInstance's DefaultComputeClass field
+//  2. The ProjectComputeClassInstance (in the project namespace) with a Default field set to true
+//  3. The ClusterComputeClassInstance with a Default field set to true
+//
+// If no default ComputeClass is found, an empty string is returned.
+// If the project specifies a default compute class that doesn't exist, an error is returned.
+func GetDefaultComputeClassName(ctx context.Context, c kclient.Client, namespace string) (string, error) {
+	var project internalv1.ProjectInstance
+	if err := c.Get(ctx, kclient.ObjectKey{Name: namespace}, &project); err != nil {
+		return "", fmt.Errorf("failed to get project instance to determine default compute class: %w", err)
+	}
+
+	if projectSpecified := project.Status.DefaultComputeClass; projectSpecified != "" {
+		if err := lookupComputeClass(ctx, c, namespace, projectSpecified); err != nil {
+			if apierrors.IsNotFound(err) {
+				return "", fmt.Errorf("project specified default compute class [%v] does not exist: %w", projectSpecified, err)
+			}
+			return "", fmt.Errorf("failed to get project specified default compute class [%v]: %w", projectSpecified, err)
+		}
+
+		return projectSpecified, nil
+	}
+
+	if pcc, err := getCurrentProjectComputeClassDefault(ctx, c, namespace); err != nil {
+		return "", err
+	} else if pcc != nil && pcc.Name != "" {
+		return pcc.Name, nil
+	}
+
+	if ccc, err := getCurrentClusterComputeClassDefault(ctx, c); err != nil {
+		return "", err
+	} else if ccc != nil && ccc.Name != "" {
+		return ccc.Name, nil
+	}
+
+	return "", nil
+}
+
+func getCurrentClusterComputeClassDefault(ctx context.Context, c kclient.Client) (*ClusterComputeClassInstance, error) {
 	var clusterComputeClasses ClusterComputeClassInstanceList
-	if err := c.List(ctx, &clusterComputeClasses, &client.ListOptions{}); err != nil {
+	if err := c.List(ctx, &clusterComputeClasses, &kclient.ListOptions{}); err != nil {
 		return nil, err
 	}
 
 	sort.Slice(clusterComputeClasses.Items, func(i, j int) bool {
 		return clusterComputeClasses.Items[i].Name < clusterComputeClasses.Items[j].Name
 	})
 
-	var defaultCCC, projectSpecifiedCCC *ClusterComputeClassInstance
+	var defaultCCC *ClusterComputeClassInstance
 	for _, clusterComputeClass := range clusterComputeClasses.Items {
 		if clusterComputeClass.Default {
 			if defaultCCC != nil {
@@ -30,33 +71,24 @@ func getCurrentClusterComputeClassDefault(ctx context.Context, c client.Client,
 					defaultCCC.Name, clusterComputeClass.Name)
 			}
 
-			// Create a new variable that isn't being iterated on to get a pointer
 			defaultCCC = z.Pointer(clusterComputeClass)
 		}
-
-		if projectSpecified != "" && clusterComputeClass.Name == projectSpecified {
-			projectSpecifiedCCC = z.Pointer(clusterComputeClass)
-		}
-	}
-
-	if projectSpecifiedCCC != nil {
-		return projectSpecifiedCCC, nil
 	}
 
 	return defaultCCC, nil
 }
 
-func getCurrentProjectComputeClassDefault(ctx context.Context, c client.Client, projectSpecified, namespace string) (*ProjectComputeClassInstance, error) {
+func getCurrentProjectComputeClassDefault(ctx context.Context, c kclient.Client, namespace string) (*ProjectComputeClassInstance, error) {
 	var projectComputeClasses ProjectComputeClassInstanceList
-	if err := c.List(ctx, &projectComputeClasses, &client.ListOptions{Namespace: namespace}); err != nil {
+	if err := c.List(ctx, &projectComputeClasses, &kclient.ListOptions{Namespace: namespace}); err != nil {
 		return nil, err
 	}
 
 	sort.Slice(projectComputeClasses.Items, func(i, j int) bool {
 		return projectComputeClasses.Items[i].Name < projectComputeClasses.Items[j].Name
 	})
 
-	var defaultPCC, projectSpecifiedPCC *ProjectComputeClassInstance
+	var defaultPCC *ProjectComputeClassInstance
 	for _, projectComputeClass := range projectComputeClasses.Items {
 		if projectComputeClass.Default {
 			if defaultPCC != nil {
@@ -65,61 +97,18 @@ func getCurrentProjectComputeClassDefault(ctx context.Context, c client.Client,
 					defaultPCC.Name, projectComputeClass.Name)
 			}
 
-			// Create a new variable that isn't being iterated on to get a pointer
 			defaultPCC = z.Pointer(projectComputeClass)
 		}
-
-		if projectSpecified != "" && projectComputeClass.Name == projectSpecified {
-			projectSpecifiedPCC = z.Pointer(projectComputeClass)
-		}
-	}
-
-	if projectSpecifiedPCC != nil {
-		return projectSpecifiedPCC, nil
 	}
 
 	return defaultPCC, nil
 }
 
-// GetDefaultComputeClassName gets the name of the effective default ComputeClass for a given project namespace.
-// The precedence for picking the default ComputeClass is as follows:
-//  1. Any ProjectComputeClassInstance (in the project namespace) or ClusterComputeClassInstance that is specified by the
-//     ProjectInstance's DefaultComputeClass field
-//  2. The ProjectComputeClassInstance (in the project namespace) with a Default field set to true
-//  3. The ClusterComputeClassInstance with a Default field set to true
-//
-// If no default ComputeClass is found, an empty string is returned.
-func GetDefaultComputeClassName(ctx context.Context, c client.Client, namespace string) (string, error) {
-	var project internalv1.ProjectInstance
-	if err := c.Get(ctx, client.ObjectKey{Name: namespace}, &project); err != nil {
-		return "", fmt.Errorf("failed to get projectinstance to determine default compute class: %w", err)
-	}
-	projectSpecified := project.Status.DefaultComputeClass
-
-	var defaultComputeClasses []string
-	pcc, err := getCurrentProjectComputeClassDefault(ctx, c, projectSpecified, namespace)
-	if err != nil {
-		return "", err
-	}
-	if pcc != nil {
-		defaultComputeClasses = append(defaultComputeClasses, pcc.Name)
-	}
-
-	ccc, err := getCurrentClusterComputeClassDefault(ctx, c, projectSpecified)
-	if err != nil {
-		return "", err
-	}
-	if ccc != nil {
-		defaultComputeClasses = append(defaultComputeClasses, ccc.Name)
-	}
-
-	if sets.New(defaultComputeClasses...).Has(projectSpecified) {
-		return projectSpecified, nil
+func lookupComputeClass(ctx context.Context, c kclient.Client, namespace, name string) error {
+	if err := c.Get(ctx, kclient.ObjectKey{Namespace: namespace, Name: name},
+		new(ProjectComputeClassInstance)); kclient.IgnoreNotFound(err) != nil {
+		return err
 	}
 
-	if len(defaultComputeClasses) > 0 {
-		return defaultComputeClasses[0], nil
-	}
-
-	return "", nil
+	return c.Get(ctx, kclient.ObjectKey{Namespace: "", Name: name}, new(ClusterComputeClassInstance))
 }

pkg/apis/internal.admin.acorn.io/v1/default_test.go

@@ -172,7 +172,7 @@ func TestGetDefaultComputeClass(t *testing.T) {
 						ObjectMeta: metav1.ObjectMeta{
 							Name: "pcc-project",
 						},
-						Spec: internalv1.ProjectInstanceSpec{
+						Status: internalv1.ProjectInstanceStatus{
 							DefaultComputeClass: "project-specified-default",
 						},
 					},
@@ -185,7 +185,7 @@ func TestGetDefaultComputeClass(t *testing.T) {
 				).Build(),
 			},
 			expected: expected{
-				computeClassName: "self-specified-default",
+				error: true,
 			},
 		},
 	} {