Update lister-gen

- Remove "zz_generated." prefix from generated lister file names
- Add support for expansion interfaces

cmd/libs/go2idl/lister-gen/generators/BUILD

@@ -13,6 +13,7 @@ load(
 go_library(
     name = "go_default_library",
     srcs = [
+        "expansion.go",
         "lister.go",
         "tags.go",
     ],

cmd/libs/go2idl/lister-gen/generators/expansion.go

@@ -0,0 +1,65 @@
+/*
+Copyright 2016 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 generators
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"k8s.io/gengo/generator"
+	"k8s.io/gengo/types"
+)
+
+// expansionGenerator produces a file for a expansion interfaces.
+type expansionGenerator struct {
+	generator.DefaultGen
+	packagePath string
+	types       []*types.Type
+}
+
+// We only want to call GenerateType() once per group.
+func (g *expansionGenerator) Filter(c *generator.Context, t *types.Type) bool {
+	return t == g.types[0]
+}
+
+func (g *expansionGenerator) GenerateType(c *generator.Context, t *types.Type, w io.Writer) error {
+	sw := generator.NewSnippetWriter(w, c, "$", "$")
+	for _, t := range g.types {
+		if _, err := os.Stat(filepath.Join(g.packagePath, strings.ToLower(t.Name.Name+"_expansion.go"))); os.IsNotExist(err) {
+			sw.Do(expansionInterfaceTemplate, t)
+			namespaced := !extractBoolTagOrDie("nonNamespaced", t.SecondClosestCommentLines)
+			if namespaced {
+				sw.Do(namespacedExpansionInterfaceTemplate, t)
+			}
+		}
+	}
+	return sw.Error()
+}
+
+var expansionInterfaceTemplate = `
+// $.|public$ListerExpansion allows custom methods to be added to
+// $.|public$Lister.
+type $.|public$ListerExpansion interface {}
+`
+
+var namespacedExpansionInterfaceTemplate = `
+// $.|public$NamespaceListerExpansion allows custom methods to be added to
+// $.|public$NamespaeLister.
+type $.|public$NamespaceListerExpansion interface {}
+`

cmd/libs/go2idl/lister-gen/generators/lister.go

@@ -114,19 +114,35 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 			internalGVPkg = strings.Join(parts[0:len(parts)-1], "/")
 		}
 
+		var typesToGenerate []*types.Type
+		for _, t := range p.Types {
+			// filter out types which dont have genclient=true.
+			if extractBoolTagOrDie("genclient", t.SecondClosestCommentLines) == false {
+				continue
+			}
+			typesToGenerate = append(typesToGenerate, t)
+		}
+		orderer := namer.Orderer{Namer: namer.NewPrivateNamer(0)}
+		typesToGenerate = orderer.OrderTypes(typesToGenerate)
+
+		packagePath := filepath.Join(arguments.OutputPackagePath, strings.ToLower(gv.Group.NonEmpty()), strings.ToLower(gv.Version.NonEmpty()))
 		packageList = append(packageList, &generator.DefaultPackage{
 			PackageName: strings.ToLower(gv.Version.NonEmpty()),
-			PackagePath: filepath.Join(arguments.OutputPackagePath, strings.ToLower(gv.Group.NonEmpty()), strings.ToLower(gv.Version.NonEmpty())),
+			PackagePath: packagePath,
 			HeaderText:  boilerplate,
 			GeneratorFunc: func(c *generator.Context) (generators []generator.Generator) {
-				for _, t := range p.Types {
-					// filter out types which dont have genclient=true.
-					if extractBoolTagOrDie("genclient", t.SecondClosestCommentLines) == false {
-						continue
-					}
+				generators = append(generators, &expansionGenerator{
+					DefaultGen: generator.DefaultGen{
+						OptionalName: "expansion_generated",
+					},
+					packagePath: filepath.Join(arguments.OutputBase, packagePath),
+					types:       typesToGenerate,
+				})
+
+				for _, t := range typesToGenerate {
 					generators = append(generators, &listerGenerator{
 						DefaultGen: generator.DefaultGen{
-							OptionalName: arguments.OutputFileBaseName + "." + strings.ToLower(t.Name.Name),
+							OptionalName: strings.ToLower(t.Name.Name),
 						},
 						outputPackage:  arguments.OutputPackagePath,
 						groupVersion:   gv,
@@ -248,6 +264,7 @@ type $.type|public$Lister interface {
 	List(selector labels.Selector) (ret []*$.type|raw$, err error)
 	// $.type|publicPlural$ returns an object that can list and get $.type|publicPlural$.
 	$.type|publicPlural$(namespace string) $.type|public$NamespaceLister
+	$.type|public$ListerExpansion
 }
 `
 
@@ -258,6 +275,7 @@ type $.type|public$Lister interface {
 	List(selector labels.Selector) (ret []*$.type|raw$, err error)
 	// Get retrieves the $.type|public$ from the index for a given name.
 	Get(name string) (*$.type|raw$, error)
+	$.type|public$ListerExpansion
 }
 `
 
@@ -314,6 +332,7 @@ type $.type|public$NamespaceLister interface {
 	List(selector labels.Selector) (ret []*$.type|raw$, err error)
 	// Get retrieves the $.type|public$ from the indexer for a given namespace and name.
 	Get(name string) (*$.type|raw$, error)
+	$.type|public$NamespaceListerExpansion
 }
 `
 

cmd/libs/go2idl/lister-gen/main.go

@@ -28,11 +28,10 @@ import (
 
 func main() {
 	arguments := &args.GeneratorArgs{
-		OutputBase:         args.DefaultSourceTree(),
-		GoHeaderFilePath:   filepath.Join(args.DefaultSourceTree(), "k8s.io/kubernetes/hack/boilerplate/boilerplate.go.txt"),
-		GeneratedBuildTag:  "ignore_autogenerated",
-		OutputFileBaseName: "zz_generated",
-		OutputPackagePath:  "k8s.io/kubernetes/pkg/client/listers",
+		OutputBase:        args.DefaultSourceTree(),
+		GoHeaderFilePath:  filepath.Join(args.DefaultSourceTree(), "k8s.io/kubernetes/hack/boilerplate/boilerplate.go.txt"),
+		GeneratedBuildTag: "ignore_autogenerated",
+		OutputPackagePath: "k8s.io/kubernetes/pkg/client/listers",
 	}
 	arguments.AddFlags(pflag.CommandLine)