Export and cleanup scaffolding machinery

- Export scaffolding machinery
- Reorganize scaffolding machinery that was in model
- Remove experimental pattern code (old plugin system)

Signed-off-by: Adrian Orive <[email protected]>

Author: Adirio

Makefile

@@ -97,7 +97,7 @@ test-unit: ## Run the unit tests
 .PHONY: test-coverage
 test-coverage: ## Run unit tests creating the output to report coverage
 	- rm -rf *.out  # Remove all coverage files if exists
-	go test -race -failfast -tags=integration -coverprofile=coverage-all.out -coverpkg="./pkg/cli/...,./pkg/config/...,./pkg/internal/...,./pkg/model/...,./pkg/plugin/...,./pkg/plugins/golang,./pkg/plugins/internal/..." ./pkg/...
+	go test -race -failfast -tags=integration -coverprofile=coverage-all.out -coverpkg="./pkg/cli/...,./pkg/config/...,./pkg/internal/...,./pkg/machinery/...,./pkg/model/...,./pkg/plugin/...,./pkg/plugins/golang" ./pkg/...
 
 .PHONY: test-integration
 test-integration: ## Run the integration tests

pkg/machinery/errors.go

@@ -0,0 +1,75 @@
+/*
+Copyright 2020 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 machinery
+
+import (
+	"fmt"
+)
+
+// This file contains the errors returned by the scaffolding machinery
+// They are exported to be able to check which kind of error was returned
+
+// ValidateError is a wrapper error that will be used for errors returned by RequiresValidation.Validate
+type ValidateError struct {
+	error
+}
+
+// Unwrap implements Wrapper interface
+func (e ValidateError) Unwrap() error {
+	return e.error
+}
+
+// SetTemplateDefaultsError is a wrapper error that will be used for errors returned by Template.SetTemplateDefaults
+type SetTemplateDefaultsError struct {
+	error
+}
+
+// Unwrap implements Wrapper interface
+func (e SetTemplateDefaultsError) Unwrap() error {
+	return e.error
+}
+
+// ModelAlreadyExistsError is returned if the file is expected not to exist but a previous model does
+type ModelAlreadyExistsError struct {
+	path string
+}
+
+// Error implements error interface
+func (e ModelAlreadyExistsError) Error() string {
+	return fmt.Sprintf("failed to create %s: model already exists", e.path)
+}
+
+// UnknownIfExistsActionError is returned if the if-exists-action is unknown
+type UnknownIfExistsActionError struct {
+	path           string
+	ifExistsAction IfExistsAction
+}
+
+// Error implements error interface
+func (e UnknownIfExistsActionError) Error() string {
+	return fmt.Sprintf("unknown behavior if file exists (%d) for %s", e.ifExistsAction, e.path)
+}
+
+// FileAlreadyExistsError is returned if the file is expected not to exist but it does
+type FileAlreadyExistsError struct {
+	path string
+}
+
+// Error implements error interface
+func (e FileAlreadyExistsError) Error() string {
+	return fmt.Sprintf("failed to create %s: file already exists", e.path)
+}

pkg/machinery/errors_test.go

@@ -0,0 +1,48 @@
+/*
+Copyright 2020 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 machinery
+
+import (
+	"errors"
+	"path/filepath"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/extensions/table"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Errors", func() {
+	var (
+		path    = filepath.Join("path", "to", "file")
+		testErr = errors.New("test error")
+	)
+
+	DescribeTable("should contain the wrapped error",
+		func(err error) {
+			Expect(errors.Is(err, testErr)).To(BeTrue())
+		},
+		Entry("for validate errors", ValidateError{testErr}),
+		Entry("for set template defaults errors", SetTemplateDefaultsError{testErr}),
+	)
+
+	// NOTE: the following test increases coverage
+	It("should print a descriptive error message", func() {
+		Expect(ModelAlreadyExistsError{path}.Error()).To(ContainSubstring("model already exists"))
+		Expect(UnknownIfExistsActionError{path, -1}.Error()).To(ContainSubstring("unknown behavior if file exists"))
+		Expect(FileAlreadyExistsError{path}.Error()).To(ContainSubstring("file already exists"))
+	})
+})

pkg/model/file/file.go renamed to pkg/machinery/file.go

@@ -14,30 +14,30 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package file
+package machinery
 
 // IfExistsAction determines what to do if the scaffold file already exists
 type IfExistsAction int
 
 const (
-	// Skip skips the file and moves to the next one
-	Skip IfExistsAction = iota
+	// SkipFile skips the file and moves to the next one
+	SkipFile IfExistsAction = iota
 
 	// Error returns an error and stops processing
 	Error
 
-	// Overwrite truncates and overwrites the existing file
-	Overwrite
+	// OverwriteFile truncates and overwrites the existing file
+	OverwriteFile
 )
 
 // File describes a file that will be written
 type File struct {
 	// Path is the file to write
-	Path string `json:"path,omitempty"`
+	Path string
 
 	// Contents is the generated output
-	Contents string `json:"contents,omitempty"`
+	Contents string
 
 	// IfExistsAction determines what to do if the file exists
-	IfExistsAction IfExistsAction `json:"ifExistsAction,omitempty"`
+	IfExistsAction IfExistsAction
 }

pkg/model/file/funcmap.go renamed to pkg/machinery/funcmap.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package file
+package machinery
 
 import (
 	"fmt"
@@ -39,10 +39,9 @@ func isEmptyString(s string) bool {
 }
 
 // hashFNV will generate a random string useful for generating a unique string
-func hashFNV(s string) (string, error) {
+func hashFNV(s string) string {
 	hasher := fnv.New32a()
-	if _, err := hasher.Write([]byte(s)); err != nil {
-		return "", err
-	}
-	return fmt.Sprintf("%x", hasher.Sum(nil)), nil
+	// Hash.Write never returns an error
+	_, _ = hasher.Write([]byte(s))
+	return fmt.Sprintf("%x", hasher.Sum(nil))
 }

pkg/machinery/funcmap_test.go

@@ -0,0 +1,45 @@
+/*
+Copyright 2021 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 machinery
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/extensions/table"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("funcmap functions", func() {
+	Context("isEmptyString", func() {
+		It("should return true for empty strings", func() {
+			Expect(isEmptyString("")).To(BeTrue())
+		})
+
+		DescribeTable("should return false for any other string",
+			func(str string) { Expect(isEmptyString(str)).To(BeFalse()) },
+			Entry(`for "a"`, "a"),
+			Entry(`for "1"`, "1"),
+			Entry(`for "-"`, "-"),
+			Entry(`for "."`, "."),
+		)
+	})
+
+	Context("hashFNV", func() {
+		It("should hash the input", func() {
+			Expect(hashFNV("test")).To(Equal("afd071e5"))
+		})
+	})
+})

pkg/machinery/injector.go

@@ -0,0 +1,66 @@
+/*
+Copyright 2021 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 machinery
+
+import (
+	"sigs.k8s.io/kubebuilder/v3/pkg/config"
+	"sigs.k8s.io/kubebuilder/v3/pkg/model/resource"
+)
+
+// injector is used to inject certain fields to file templates.
+type injector struct {
+	// config stores the project configuration.
+	config config.Config
+
+	// boilerplate is the copyright comment added at the top of scaffolded files.
+	boilerplate string
+
+	// resource contains the information of the API that is being scaffolded.
+	resource *resource.Resource
+}
+
+// injectInto injects fields from the universe into the builder
+func (i injector) injectInto(builder Builder) {
+	// Inject project configuration
+	if i.config != nil {
+		if builderWithDomain, hasDomain := builder.(HasDomain); hasDomain {
+			builderWithDomain.InjectDomain(i.config.GetDomain())
+		}
+		if builderWithRepository, hasRepository := builder.(HasRepository); hasRepository {
+			builderWithRepository.InjectRepository(i.config.GetRepository())
+		}
+		if builderWithProjectName, hasProjectName := builder.(HasProjectName); hasProjectName {
+			builderWithProjectName.InjectProjectName(i.config.GetProjectName())
+		}
+		if builderWithMultiGroup, hasMultiGroup := builder.(HasMultiGroup); hasMultiGroup {
+			builderWithMultiGroup.InjectMultiGroup(i.config.IsMultiGroup())
+		}
+		if builderWithComponentConfig, hasComponentConfig := builder.(HasComponentConfig); hasComponentConfig {
+			builderWithComponentConfig.InjectComponentConfig(i.config.IsComponentConfig())
+		}
+	}
+	// Inject boilerplate
+	if builderWithBoilerplate, hasBoilerplate := builder.(HasBoilerplate); hasBoilerplate {
+		builderWithBoilerplate.InjectBoilerplate(i.boilerplate)
+	}
+	// Inject resource
+	if i.resource != nil {
+		if builderWithResource, hasResource := builder.(HasResource); hasResource {
+			builderWithResource.InjectResource(i.resource)
+		}
+	}
+}