✨ Return a typed error in case DecodePluginConfig was unable to find the provided key

pkg/config/errors.go

@@ -32,28 +32,38 @@ func (e UnsupportedVersionError) Error() string {
 	return fmt.Sprintf("version %s is not supported", e.Version)
 }
 
-// UnsupportedField is returned when a project configuration version does not support
+// UnsupportedFieldError is returned when a project configuration version does not support
 // one of the fields as interface must be common for all the versions
-type UnsupportedField struct {
+type UnsupportedFieldError struct {
 	Version Version
 	Field   string
 }
 
 // Error implements error interface
-func (e UnsupportedField) Error() string {
+func (e UnsupportedFieldError) Error() string {
 	return fmt.Sprintf("version %s does not support the %s field", e.Version, e.Field)
 }
 
-// UnknownResource is returned by Config.GetResource when the provided GVK cannot be found
-type UnknownResource struct {
+// ResourceNotFoundError is returned by Config.GetResource when the provided GVK cannot be found
+type ResourceNotFoundError struct {
 	GVK resource.GVK
 }
 
 // Error implements error interface
-func (e UnknownResource) Error() string {
+func (e ResourceNotFoundError) Error() string {
 	return fmt.Sprintf("resource %v could not be found", e.GVK)
 }
 
+// PluginKeyNotFoundError is returned by Config.DecodePluginConfig when the provided key cannot be found
+type PluginKeyNotFoundError struct {
+	Key string
+}
+
+// Error implements error interface
+func (e PluginKeyNotFoundError) Error() string {
+	return fmt.Sprintf("plugin key %q could not be found", e.Key)
+}
+
 // MarshalError is returned by Config.Marshal when something went wrong while marshalling to YAML
 type MarshalError struct {
 	Err error

pkg/config/errors_test.go

@@ -37,8 +37,8 @@ var _ = Describe("UnsupportedVersionError", func() {
 	})
 })
 
-var _ = Describe("UnsupportedField", func() {
-	var err = UnsupportedField{
+var _ = Describe("UnsupportedFieldError", func() {
+	var err = UnsupportedFieldError{
 		Version: Version{Number: 1},
 		Field:   "name",
 	}
@@ -50,8 +50,8 @@ var _ = Describe("UnsupportedField", func() {
 	})
 })
 
-var _ = Describe("UnknownResource", func() {
-	var err = UnknownResource{
+var _ = Describe("ResourceNotFoundError", func() {
+	var err = ResourceNotFoundError{
 		GVK: resource.GVK{
 			Group:   "group",
 			Domain:  "my.domain",
@@ -67,6 +67,18 @@ var _ = Describe("UnknownResource", func() {
 	})
 })
 
+var _ = Describe("PluginKeyNotFoundError", func() {
+	var err = PluginKeyNotFoundError{
+		Key: "go.kubebuilder.io/v1",
+	}
+
+	Context("Error", func() {
+		It("should return the correct error message", func() {
+			Expect(err.Error()).To(Equal("plugin key \"go.kubebuilder.io/v1\" could not be found"))
+		})
+	})
+})
+
 var _ = Describe("MarshalError", func() {
 	var (
 		wrapped = fmt.Errorf("error message")

pkg/config/v2/config.go

@@ -88,7 +88,7 @@ func (c cfg) GetProjectName() string {
 
 // SetProjectName implements config.Config
 func (c *cfg) SetProjectName(string) error {
-	return config.UnsupportedField{
+	return config.UnsupportedFieldError{
 		Version: Version,
 		Field:   "project name",
 	}
@@ -101,7 +101,7 @@ func (c cfg) GetLayout() string {
 
 // SetLayout implements config.Config
 func (c *cfg) SetLayout(string) error {
-	return config.UnsupportedField{
+	return config.UnsupportedFieldError{
 		Version: Version,
 		Field:   "layout",
 	}
@@ -131,15 +131,15 @@ func (c cfg) IsComponentConfig() bool {
 
 // SetComponentConfig implements config.Config
 func (c *cfg) SetComponentConfig() error {
-	return config.UnsupportedField{
+	return config.UnsupportedFieldError{
 		Version: Version,
 		Field:   "component config",
 	}
 }
 
 // ClearComponentConfig implements config.Config
 func (c *cfg) ClearComponentConfig() error {
-	return config.UnsupportedField{
+	return config.UnsupportedFieldError{
 		Version: Version,
 		Field:   "component config",
 	}
@@ -175,7 +175,7 @@ func (c cfg) GetResource(gvk resource.GVK) (resource.Resource, error) {
 		}
 	}
 
-	return resource.Resource{}, config.UnknownResource{GVK: gvk}
+	return resource.Resource{}, config.ResourceNotFoundError{GVK: gvk}
 }
 
 // GetResources implements config.Config
@@ -234,15 +234,15 @@ func (c cfg) IsWebhookVersionCompatible(webhookVersion string) bool {
 
 // DecodePluginConfig implements config.Config
 func (c cfg) DecodePluginConfig(string, interface{}) error {
-	return config.UnsupportedField{
+	return config.UnsupportedFieldError{
 		Version: Version,
 		Field:   "plugins",
 	}
 }
 
 // EncodePluginConfig implements config.Config
 func (c cfg) EncodePluginConfig(string, interface{}) error {
-	return config.UnsupportedField{
+	return config.UnsupportedFieldError{
 		Version: Version,
 		Field:   "plugins",
 	}

pkg/config/v3/config.go

@@ -180,7 +180,7 @@ func (c cfg) GetResource(gvk resource.GVK) (resource.Resource, error) {
 		}
 	}
 
-	return resource.Resource{}, config.UnknownResource{GVK: gvk}
+	return resource.Resource{}, config.ResourceNotFoundError{GVK: gvk}
 }
 
 // GetResources implements config.Config
@@ -283,7 +283,7 @@ func (c cfg) resourceAPIVersionCompatible(verType, version string) bool {
 // DecodePluginConfig implements config.Config
 func (c cfg) DecodePluginConfig(key string, configObj interface{}) error {
 	if len(c.Plugins) == 0 {
-		return nil
+		return config.PluginKeyNotFoundError{Key: key}
 	}
 
 	// Get the object blob by key and unmarshal into the object.
@@ -295,9 +295,10 @@ func (c cfg) DecodePluginConfig(key string, configObj interface{}) error {
 		if err := yaml.Unmarshal(b, configObj); err != nil {
 			return fmt.Errorf("failed to unmarshal extra fields object: %w", err)
 		}
+		return nil
 	}
 
-	return nil
+	return config.PluginKeyNotFoundError{Key: key}
 }
 
 // EncodePluginConfig will return an error if used on any project version < v3.

pkg/config/v3/config_test.go

@@ -17,12 +17,14 @@ limitations under the License.
 package v3
 
 import (
+	"errors"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/ginkgo/extensions/table"
 	. "github.com/onsi/gomega"
 
+	"sigs.k8s.io/kubebuilder/v3/pkg/config"
 	"sigs.k8s.io/kubebuilder/v3/pkg/model/resource"
 )
 
@@ -390,13 +392,19 @@ var _ = Describe("cfg", func() {
 			}
 		)
 
+		It("DecodePluginConfig should fail for no plugin config object", func() {
+			var pluginConfig PluginConfig
+			err := c0.DecodePluginConfig(key, &pluginConfig)
+			Expect(err).To(HaveOccurred())
+			Expect(errors.As(err, &config.PluginKeyNotFoundError{})).To(BeTrue())
+		})
+
 		DescribeTable("DecodePluginConfig should retrieve the plugin data correctly",
 			func(inputConfig cfg, expectedPluginConfig PluginConfig) {
 				var pluginConfig PluginConfig
 				Expect(inputConfig.DecodePluginConfig(key, &pluginConfig)).To(Succeed())
 				Expect(pluginConfig).To(Equal(expectedPluginConfig))
 			},
-			Entry("for no plugin config object", c0, nil),
 			Entry("for an empty plugin config object", c1, PluginConfig{}),
 			Entry("for a full plugin config object", c2, pluginConfig),
 			// TODO (coverage): add cases where yaml.Marshal returns an error