Declarative plugin

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

cmd/main.go

@@ -22,6 +22,7 @@ import (
 	"sigs.k8s.io/kubebuilder/v3/pkg/cli"
 	cfgv2 "sigs.k8s.io/kubebuilder/v3/pkg/config/v2"
 	cfgv3 "sigs.k8s.io/kubebuilder/v3/pkg/config/v3"
+	declarativev1 "sigs.k8s.io/kubebuilder/v3/pkg/plugins/declarative/v1"
 	pluginv2 "sigs.k8s.io/kubebuilder/v3/pkg/plugins/golang/v2"
 	pluginv3 "sigs.k8s.io/kubebuilder/v3/pkg/plugins/golang/v3"
 )
@@ -34,6 +35,7 @@ func main() {
 		cli.WithPlugins(
 			&pluginv2.Plugin{},
 			&pluginv3.Plugin{},
+			&declarativev1.Plugin{},
 		),
 		cli.WithDefaultPlugins(cfgv2.Version, &pluginv2.Plugin{}),
 		cli.WithDefaultPlugins(cfgv3.Version, &pluginv3.Plugin{}),

pkg/plugins/declarative/v1/api.go

@@ -0,0 +1,107 @@
+/*
+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 v1
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"github.com/spf13/afero"
+
+	"sigs.k8s.io/kubebuilder/v3/pkg/config"
+	"sigs.k8s.io/kubebuilder/v3/pkg/model"
+	"sigs.k8s.io/kubebuilder/v3/pkg/model/resource"
+	"sigs.k8s.io/kubebuilder/v3/pkg/plugin"
+	"sigs.k8s.io/kubebuilder/v3/pkg/plugins/declarative/v1/internal/templates"
+	goPluginV3 "sigs.k8s.io/kubebuilder/v3/pkg/plugins/golang/v3"
+	"sigs.k8s.io/kubebuilder/v3/pkg/plugins/internal/machinery"
+	"sigs.k8s.io/kubebuilder/v3/pkg/plugins/internal/util"
+)
+
+const (
+	// kbDeclarativePattern is the sigs.k8s.io/kubebuilder-declarative-pattern version
+	kbDeclarativePatternForV2 = "v0.0.0-20200522144838-848d48e5b073"
+	kbDeclarativePatternForV3 = "v0.0.0-20210113160450-b84d99da0217"
+
+	exampleManifestVersion = "0.0.1"
+)
+
+var _ plugin.CreateAPISubcommand = &createAPISubcommand{}
+
+type createAPISubcommand struct {
+	config config.Config
+
+	resource *resource.Resource
+}
+
+func (p *createAPISubcommand) InjectConfig(c config.Config) error {
+	p.config = c
+
+	return nil
+}
+
+func (p *createAPISubcommand) InjectResource(res *resource.Resource) error {
+	p.resource = res
+
+	if !p.resource.HasAPI() || !p.resource.HasController() {
+		return plugin.ExitError{
+			Plugin: pluginName,
+			Reason: "declarative pattern is only supported when API and controller are scaffolded",
+		}
+	}
+
+	return nil
+}
+
+func (p *createAPISubcommand) Scaffold(fs afero.Fs) error {
+	fmt.Println("updating scaffold with declarative pattern...")
+
+	// Load the boilerplate
+	bp, err := afero.ReadFile(fs, filepath.Join("hack", "boilerplate.go.txt"))
+	if err != nil {
+		return fmt.Errorf("error updating scaffold: unable to load boilerplate: %w", err)
+	}
+	boilerplate := string(bp)
+
+	if err := machinery.NewScaffold(fs).Execute(
+		model.NewUniverse(
+			model.WithConfig(p.config),
+			model.WithBoilerplate(boilerplate),
+			model.WithResource(p.resource),
+		),
+		&templates.Types{},
+		&templates.Controller{},
+		&templates.Channel{ManifestVersion: exampleManifestVersion},
+		&templates.Manifest{ManifestVersion: exampleManifestVersion},
+	); err != nil {
+		return fmt.Errorf("error updating scaffold: %w", err)
+	}
+
+	// Ensure that we are pinning sigs.k8s.io/kubebuilder-declarative-pattern version
+	kbDeclarativePattern := kbDeclarativePatternForV2
+	if strings.Split(p.config.GetLayout(), ",")[0] == plugin.KeyFor(goPluginV3.Plugin{}) {
+		kbDeclarativePattern = kbDeclarativePatternForV3
+	}
+	err = util.RunCmd("Get declarative pattern", "go", "get",
+		"sigs.k8s.io/kubebuilder-declarative-pattern@"+kbDeclarativePattern)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

pkg/plugins/declarative/v1/internal/templates/channel.go

@@ -0,0 +1,52 @@
+/*
+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 templates
+
+import (
+	"fmt"
+	"path/filepath"
+
+	"sigs.k8s.io/kubebuilder/v3/pkg/model/file"
+)
+
+var _ file.Template = &Channel{}
+
+// Channel scaffolds the file for the channel
+type Channel struct {
+	file.TemplateMixin
+
+	ManifestVersion string
+}
+
+// SetTemplateDefaults implements file.Template
+func (f *Channel) SetTemplateDefaults() error {
+	if f.Path == "" {
+		f.Path = filepath.Join("channels", "stable")
+	}
+	fmt.Println(f.Path)
+
+	f.TemplateBody = channelTemplate
+
+	f.IfExistsAction = file.Skip
+
+	return nil
+}
+
+const channelTemplate = `# Versions for the stable channel
+manifests:
+- version: {{ .ManifestVersion }}
+`

pkg/plugins/declarative/v1/internal/templates/controller.go

@@ -0,0 +1,130 @@
+/*
+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 templates
+
+import (
+	"path/filepath"
+
+	"sigs.k8s.io/kubebuilder/v3/pkg/model/file"
+)
+
+var _ file.Template = &Controller{}
+
+// Controller scaffolds the file that defines the controller for a CRD or a builtin resource
+// nolint:maligned
+type Controller struct {
+	file.TemplateMixin
+	file.MultiGroupMixin
+	file.BoilerplateMixin
+	file.ResourceMixin
+}
+
+// SetTemplateDefaults implements file.Template
+func (f *Controller) SetTemplateDefaults() error {
+	if f.Path == "" {
+		if f.MultiGroup {
+			f.Path = filepath.Join("controllers", "%[group]", "%[kind]_controller.go")
+		} else {
+			f.Path = filepath.Join("controllers", "%[kind]_controller.go")
+		}
+	}
+	f.Path = f.Resource.Replacer().Replace(f.Path)
+
+	f.TemplateBody = controllerTemplate
+
+	f.IfExistsAction = file.Overwrite
+
+	return nil
+}
+
+//nolint:lll
+const controllerTemplate = `{{ .Boilerplate }}
+
+package controllers
+
+import (
+	"github.com/go-logr/logr"
+	"k8s.io/apimachinery/pkg/runtime"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/controller"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+	"sigs.k8s.io/controller-runtime/pkg/source"
+	"sigs.k8s.io/kubebuilder-declarative-pattern/pkg/patterns/addon"
+	"sigs.k8s.io/kubebuilder-declarative-pattern/pkg/patterns/addon/pkg/status"
+	"sigs.k8s.io/kubebuilder-declarative-pattern/pkg/patterns/declarative"
+
+	{{ .Resource.ImportAlias }} "{{ .Resource.Path }}"
+)
+
+var _ reconcile.Reconciler = &{{ .Resource.Kind }}Reconciler{}
+
+// {{ .Resource.Kind }}Reconciler reconciles a {{ .Resource.Kind }} object
+type {{ .Resource.Kind }}Reconciler struct {
+	client.Client
+	Log    logr.Logger
+	Scheme *runtime.Scheme
+
+	declarative.Reconciler
+}
+
+//+kubebuilder:rbac:groups={{ .Resource.QualifiedGroup }},resources={{ .Resource.Plural }},verbs=get;list;watch;create;update;patch;delete
+//+kubebuilder:rbac:groups={{ .Resource.QualifiedGroup }},resources={{ .Resource.Plural }}/status,verbs=get;update;patch
+
+// SetupWithManager sets up the controller with the Manager.
+func (r *{{ .Resource.Kind }}Reconciler) SetupWithManager(mgr ctrl.Manager) error {
+	addon.Init()
+
+	labels := map[string]string{
+		"k8s-app": "{{ lower .Resource.Kind }}",
+	}
+
+	watchLabels := declarative.SourceLabel(mgr.GetScheme())
+
+	if err := r.Reconciler.Init(mgr, &{{ .Resource.ImportAlias }}.{{ .Resource.Kind }}{},
+		declarative.WithObjectTransform(declarative.AddLabels(labels)),
+		declarative.WithOwner(declarative.SourceAsOwner),
+		declarative.WithLabels(watchLabels),
+		declarative.WithStatus(status.NewBasic(mgr.GetClient())),
+		// TODO: add an application to your manifest:  declarative.WithObjectTransform(addon.TransformApplicationFromStatus),
+		// TODO: add an application to your manifest:  declarative.WithManagedApplication(watchLabels),
+		declarative.WithObjectTransform(addon.ApplyPatches),
+	); err != nil {
+		return err
+	}
+
+	c, err := controller.New("{{ lower .Resource.Kind }}-controller", mgr, controller.Options{Reconciler: r})
+	if err != nil {
+		return err
+	}
+
+	// Watch for changes to {{ .Resource.Kind }}
+	err = c.Watch(&source.Kind{Type: &{{ .Resource.ImportAlias }}.{{ .Resource.Kind }}{}}, &handler.EnqueueRequestForObject{})
+	if err != nil {
+		return err
+	}
+
+	// Watch for changes to deployed objects
+	_, err = declarative.WatchAll(mgr.GetConfig(), c, r, watchLabels)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+`

pkg/plugins/declarative/v1/internal/templates/manifest.go

@@ -0,0 +1,52 @@
+/*
+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 templates
+
+import (
+	"fmt"
+	"path/filepath"
+
+	"sigs.k8s.io/kubebuilder/v3/pkg/model/file"
+)
+
+var _ file.Template = &Manifest{}
+
+// Manifest scaffolds the file that acts as a placeholder for the manifest
+type Manifest struct {
+	file.TemplateMixin
+	file.ResourceMixin
+
+	ManifestVersion string
+}
+
+// SetTemplateDefaults implements file.Template
+func (f *Manifest) SetTemplateDefaults() error {
+	if f.Path == "" {
+		f.Path = filepath.Join("channels", "packages", "%[kind]", f.ManifestVersion, "manifest.yaml")
+	}
+	f.Path = f.Resource.Replacer().Replace(f.Path)
+	fmt.Println(f.Path)
+
+	f.TemplateBody = manifestTemplate
+
+	f.IfExistsAction = file.Skip
+
+	return nil
+}
+
+const manifestTemplate = `# Placeholder manifest - replace with the manifest for your addon
+`