Remove some duped code.

k8sdeps/kv/plugin/registry.go

@@ -32,8 +32,8 @@ type Registry struct {
 }
 
 const (
-	TransformerSymbol = "Transformer"
+	PluginSymbol      = "KustomizePlugin"
-	PluginsDir        = "plugins"
+	PluginRoot        = "plugins"
 	pluginTypeGo      = types.PluginType("go")
 	pluginTypeBuiltIn = types.PluginType("builtin")
 )
@@ -48,7 +48,7 @@ func DefaultPluginConfig() *types.PluginConfig {
 	return &types.PluginConfig{
 		GoEnabled: false,
 		DirectoryPath: filepath.Join(
-			pgmconfig.ConfigRoot(), PluginsDir),
+			pgmconfig.ConfigRoot(), PluginRoot),
 	}
 }
 

pkg/plugins/generators.go

@@ -18,81 +18,40 @@ package plugins
 
 import (
 	"fmt"
-	"path/filepath"
+	"sigs.k8s.io/kustomize/pkg/transformers"
-	"plugin"
+	"sigs.k8s.io/kustomize/pkg/types"
 
-	"github.com/pkg/errors"
-	"sigs.k8s.io/kustomize/pkg/pgmconfig"
-	"sigs.k8s.io/kustomize/pkg/resid"
 	"sigs.k8s.io/kustomize/pkg/resmap"
-	"sigs.k8s.io/kustomize/pkg/resource"
 )
 
-const generatorSymbol = "Generator"
-
-type Generatable interface {
-	Generate() (resmap.ResMap, error)
-}
-
 type generatorLoader struct {
-	pluginDir string
+	pc *types.PluginConfig
-	enabled   bool
-	rf        *resmap.Factory
 }
 
-func NewGeneratorLoader(b bool, f *resmap.Factory) generatorLoader {
+func NewGeneratorLoader(pc *types.PluginConfig) generatorLoader {
-	return generatorLoader{
+	return generatorLoader{pc: pc}
-		pluginDir: filepath.Join(pgmconfig.ConfigRoot(), pgmconfig.PluginsDir),
-		enabled:   b,
-		rf:        f,
-	}
 }
 
-func (l generatorLoader) Load(rm resmap.ResMap) (resmap.ResMap, error) {
+func (l generatorLoader) Load(
+	rm resmap.ResMap) ([]transformers.Generator, error) {
 	if len(rm) == 0 {
 		return nil, nil
 	}
-	if !l.enabled {
+	if !l.pc.GoEnabled {
-		return nil, fmt.Errorf("plugin is not enabled")
+		return nil, fmt.Errorf("plugins not enabled")
 	}
-	var result resmap.ResMap
+	var result []transformers.Generator
 	for id, res := range rm {
-		r, err := l.load(id, res)
+		fileName := pluginFileName(l.pc, id)
+		c, err := loadAndConfigurePlugin(fileName, res)
 		if err != nil {
 			return nil, err
 		}
-		result, err = resmap.MergeWithErrorOnIdCollision(result, r)
+		g, ok := c.(transformers.Generator)
-		if err != nil {
+		if !ok {
-			return nil, err
+			return nil, fmt.Errorf("plugin %s not a generator", fileName)
 		}
+		result = append(result, g)
 	}
 	return result, nil
 }
-
-func (l generatorLoader) load(id resid.ResId, res *resource.Resource) (resmap.ResMap, error) {
-	fileName := filepath.Join(l.pluginDir, id.Gvk().Kind+".so")
-	goPlugin, err := plugin.Open(fileName)
-	if err != nil {
-		return nil, fmt.Errorf("plugin %s file not opened", fileName)
-	}
-
-	symbol, err := goPlugin.Lookup(generatorSymbol)
-	if err != nil {
-		return nil, fmt.Errorf("plugin %s fails lookup", fileName)
-	}
-
-	c, ok := symbol.(Configurable)
-	if !ok {
-		return nil, fmt.Errorf("plugin %s not configurable", fileName)
-	}
-	err = c.Config(res)
-	if err != nil {
-		return nil, errors.Wrapf(err, "plugin %s fails configuration", fileName)
-	}
-
-	g, ok := c.(Generatable)
-	if !ok {
-		return nil, fmt.Errorf("plugin %s not a transformer", fileName)
-	}
-	return g.Generate()
-}

pkg/plugins/transformers.go

@@ -43,7 +43,8 @@ func NewTransformerLoader(pc *types.PluginConfig) transformerLoader {
 	return transformerLoader{pc: pc}
 }
 
-func (l transformerLoader) Load(rm resmap.ResMap) ([]transformers.Transformer, error) {
+func (l transformerLoader) Load(
+	rm resmap.ResMap) ([]transformers.Transformer, error) {
 	if len(rm) == 0 {
 		return nil, nil
 	}
@@ -52,30 +53,37 @@ func (l transformerLoader) Load(rm resmap.ResMap) ([]transformers.Transformer, e
 	}
 	var result []transformers.Transformer
 	for id, res := range rm {
-		t, err := l.load(id, res)
+		fileName := pluginFileName(l.pc, id)
+		c, err := loadAndConfigurePlugin(fileName, res)
 		if err != nil {
 			return nil, err
 		}
+		t, ok := c.(transformers.Transformer)
+		if !ok {
+			return nil, fmt.Errorf("plugin %s not a transformer", fileName)
+		}
 		result = append(result, t)
 	}
 	return result, nil
 }
 
-func (l transformerLoader) load(
+func pluginFileName(pc *types.PluginConfig, id resid.ResId) string {
-	id resid.ResId, res *resource.Resource) (transformers.Transformer, error) {
+	return filepath.Join(
-	fileName := filepath.Join(
+		pc.DirectoryPath,
-		l.pc.DirectoryPath,
 		id.Gvk().Group, id.Gvk().Version, id.Gvk().Kind+".so")
+}
+
+func loadAndConfigurePlugin(
+	fileName string, res *resource.Resource) (Configurable, error) {
 	goPlugin, err := plugin.Open(fileName)
 	if err != nil {
 		return nil, fmt.Errorf("plugin %s file not opened", fileName)
 	}
-
+	symbol, err := goPlugin.Lookup(kplugin.PluginSymbol)
-	symbol, err := goPlugin.Lookup(kplugin.TransformerSymbol)
 	if err != nil {
-		return nil, fmt.Errorf("plugin %s fails lookup", fileName)
+		return nil, fmt.Errorf(
+			"plugin %s doesn't have symbol %s", fileName, kplugin.PluginSymbol)
 	}
-
 	c, ok := symbol.(Configurable)
 	if !ok {
 		return nil, fmt.Errorf("plugin %s not configurable", fileName)
@@ -84,10 +92,5 @@ func (l transformerLoader) load(
 	if err != nil {
 		return nil, errors.Wrapf(err, "plugin %s fails configuration", fileName)
 	}
-
+	return c, nil
-	t, ok := c.(transformers.Transformer)
-	if !ok {
-		return nil, fmt.Errorf("plugin %s not a transformer", fileName)
-	}
-	return t, nil
 }

pkg/target/generatorplugin_test.go

@@ -14,17 +14,14 @@ limitations under the License.
 package target_test
 
 import (
-	"os"
-	"path/filepath"
 	"testing"
 
-	"sigs.k8s.io/kustomize/pkg/pgmconfig"
+	"sigs.k8s.io/kustomize/k8sdeps/kv/plugin"
-	"sigs.k8s.io/kustomize/pkg/types"
 )
 
 func writeGenerator(th *KustTestHarness, path string) {
 	th.writeF(path, `
-apiVersion: strings.microwoosh.com/v1
+apiVersion: someteam.example.com/v1
 kind: ServiceGenerator
 metadata:
   name: myServiceGenerator
@@ -34,20 +31,14 @@ port: "12345"
 }
 
 func TestGeneratorPlugin(t *testing.T) {
-	dir, err := filepath.Abs("../../..")
+	tc := NewTestEnvController(t).Set()
-	if err != nil {
+	defer tc.Reset()
-		t.Errorf("unexpected error %v", err)
-	}
-	os.Setenv(pgmconfig.XDG_CONFIG_HOME, dir)
-	defer os.Unsetenv(pgmconfig.XDG_CONFIG_HOME)
 
-	err = buildGoPlugins(dir, "ServiceGenerator")
+	tc.BuildGoPlugin(
-	if err != nil {
+		"someteam.example.com", "v1", "ServiceGenerator")
-		t.Errorf("unexpected error %v", err)
-	}
 
 	th := NewKustTestHarnessWithPluginConfig(
-		t, "/app", types.PluginConfig{GoEnabled: true})
+		t, "/app", plugin.ActivePluginConfig())
 	th.writeK("/app", `
 generators:
 - serviceGenerator.yaml

pkg/target/kusttarget.go

@@ -173,17 +173,6 @@ func (kt *KustTarget) AccumulateTarget() ( // nolint: gocyclo
 	if err != nil {
 		errs.Append(errors.Wrap(err, "MergeResourcesWithErrorOnIdCollision"))
 	}
-	resourceFromGenerators, err := kt.loadGeneratorPlugins()
-	if err != nil {
-		errs.Append(errors.Wrap(err, "failed to load resources from generators"))
-	}
-	if len(errs.Get()) > 0 {
-		return ra, errs
-	}
-	err = ra.MergeResourcesWithErrorOnIdCollision(resourceFromGenerators)
-	if err != nil {
-		errs.Append(errors.Wrap(err, "MergeResourcesWithErrorOnIdCollision"))
-	}
 	tConfig, err := config.MakeTransformerConfig(
 		kt.ldr, kt.kustomization.Configurations)
 	if err != nil {
@@ -213,6 +202,12 @@ func (kt *KustTarget) AccumulateTarget() ( // nolint: gocyclo
 	if err != nil {
 		return nil, err
 	}
+	if kt.pluginConfig.GoEnabled {
+		kt.generateFromPlugins(ra, errs)
+		if len(errs.Get()) > 0 {
+			return ra, errs
+		}
+	}
 	patches, err := kt.rFactory.RF().SliceFromPatches(
 		kt.ldr, kt.kustomization.PatchesStrategicMerge)
 	if err != nil {
@@ -232,6 +227,26 @@ func (kt *KustTarget) AccumulateTarget() ( // nolint: gocyclo
 	return ra, nil
 }
 
+func (kt *KustTarget) generateFromPlugins(
+	ra *accumulator.ResAccumulator,
+	errs *interror.KustomizationErrors) {
+	generators, err := kt.loadGeneratorPlugins()
+	if err != nil {
+		errs.Append(err)
+	}
+	for _, g := range generators {
+		resMap, err := g.Generate()
+		if err != nil {
+			errs.Append(err)
+		} else {
+			err = ra.MergeResourcesWithErrorOnIdCollision(resMap)
+			if err != nil {
+				errs.Append(errors.Wrap(err, "from plugin"))
+			}
+		}
+	}
+}
+
 func (kt *KustTarget) generateConfigMapsAndSecrets(
 	errs *interror.KustomizationErrors) (resmap.ResMap, error) {
 	cms, err := kt.rFactory.NewResMapFromConfigMapArgs(
@@ -345,20 +360,19 @@ func (kt *KustTarget) newTransformer(
 }
 
 func (kt *KustTarget) loadTransformerPlugins() ([]transformers.Transformer, error) {
-	transformerPluginConfigs, err := kt.rFactory.FromFiles(
+	configs, err := kt.rFactory.FromFiles(
 		kt.ldr, kt.kustomization.Transformers)
 	if err != nil {
 		return nil, err
 	}
-	return plugins.NewTransformerLoader(kt.pluginConfig).Load(transformerPluginConfigs)
+	return plugins.NewTransformerLoader(kt.pluginConfig).Load(configs)
 }
 
-func (kt *KustTarget) loadGeneratorPlugins() (resmap.ResMap, error) {
+func (kt *KustTarget) loadGeneratorPlugins() ([]transformers.Generator, error) {
-	generatorPluginConfigs, err := kt.rFactory.FromFiles(
+	configs, err := kt.rFactory.FromFiles(
 		kt.ldr, kt.kustomization.Generators)
 	if err != nil {
 		return nil, err
 	}
-	gl := plugins.NewGeneratorLoader(kt.goPluginEnabled, kt.rFactory)
+	return plugins.NewGeneratorLoader(kt.pluginConfig).Load(configs)
-	return gl.Load(generatorPluginConfigs)
 }

pkg/target/testenvcontroller_test.go

@@ -105,7 +105,7 @@ func (x *TestEnvController) BuildGoPlugin(plugin ...string) {
 // ObjectRoot is the objRoot dir for plugin object files.
 func (x *TestEnvController) ObjectRoot() string {
 	return filepath.Join(
-		x.xdgConfigHome, pgmconfig.PgmName, plugin.PluginsDir)
+		x.xdgConfigHome, pgmconfig.PgmName, plugin.PluginRoot)
 }
 
 // SrcRoot is a objRoot directory for plugin source code
@@ -120,7 +120,7 @@ func (x *TestEnvController) ObjectRoot() string {
 func (x *TestEnvController) SrcRoot() string {
 	dir := filepath.Join(
 		os.Getenv("GOPATH"), "src",
-		pgmconfig.Repo, pgmconfig.PgmName, plugin.PluginsDir)
+		pgmconfig.Repo, pgmconfig.PgmName, plugin.PluginRoot)
 	if _, err := os.Stat(dir); err != nil {
 		x.t.Errorf("plugin source objRoot '%s' not found", dir)
 	}

pkg/transformers/transformer.go

@@ -26,3 +26,8 @@ type Transformer interface {
 	// Transform modifies data in the argument, e.g. adding labels to resources that can be labelled.
 	Transform(m resmap.ResMap) error
 }
+
+// A Generator creates an instance of resmap.ResMap.
+type Generator interface {
+	Generate() (resmap.ResMap, error)
+}

plugins/someteam.example.com/v1/DatePrefixer.go

@@ -13,7 +13,7 @@ import (
 
 type plugin struct{}
 
-var Transformer plugin
+var KustomizePlugin plugin
 
 func (p *plugin) Config(k ifc.Kunstructured) error {
 	return nil

plugins/someteam.example.com/v1/ServiceGenerator.go

@@ -1,3 +1,5 @@
+// +build plugin
+
 package main
 
 import (
@@ -15,7 +17,7 @@ type plugin struct {
 	Port        string
 }
 
-var Generator plugin
+var KustomizePlugin plugin
 
 var manifest = `
 apiVersion: v1

plugins/someteam.example.com/v1/StringPrefixer.go

@@ -18,11 +18,11 @@ import (
 	"sigs.k8s.io/kustomize/pkg/transformers/config"
 )
 
-type plugin struct{
+type plugin struct {
 	prefix string
 }
 
-var Transformer plugin
+var KustomizePlugin plugin
 
 func (p *plugin) Config(k ifc.Kunstructured) error {
 	var err error

plugins/someteam.example.com/v1/kvMaker.go

@@ -1,6 +1,7 @@
 // +build plugin
 
 package main
+
 var database = map[string]string{
 	"TREE":      "oak",
 	"ROCKET":    "Saturn V",
@@ -10,7 +11,9 @@ var database = map[string]string{
 }
 
 type plugin struct{}
+
 var KVSource plugin
+
 func (p plugin) Get(
 	root string, args []string) (map[string]string, error) {
 	r := make(map[string]string)