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lister.go
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lister.go
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/*
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 (
"fmt"
"io"
"path/filepath"
"strings"
"k8s.io/gengo/args"
"k8s.io/gengo/generator"
"k8s.io/gengo/namer"
"k8s.io/gengo/types"
clientgentypes "k8s.io/kubernetes/cmd/libs/go2idl/client-gen/types"
"github.com/golang/glog"
"github.com/spf13/pflag"
)
// NameSystems returns the name system used by the generators in this package.
func NameSystems() namer.NameSystems {
pluralExceptions := map[string]string{
"Endpoints": "Endpoints",
}
return namer.NameSystems{
"public": namer.NewPublicNamer(0),
"private": namer.NewPrivateNamer(0),
"raw": namer.NewRawNamer("", nil),
"publicPlural": namer.NewPublicPluralNamer(pluralExceptions),
"allLowercasePlural": namer.NewAllLowercasePluralNamer(pluralExceptions),
"lowercaseSingular": &lowercaseSingularNamer{},
}
}
// lowercaseSingularNamer implements Namer
type lowercaseSingularNamer struct{}
// Name returns t's name in all lowercase.
func (n *lowercaseSingularNamer) Name(t *types.Type) string {
return strings.ToLower(t.Name.Name)
}
// DefaultNameSystem returns the default name system for ordering the types to be
// processed by the generators in this package.
func DefaultNameSystem() string {
return "public"
}
// generatedBy returns information about the arguments used to invoke
// lister-gen.
func generatedBy() string {
var cmdArgs string
pflag.VisitAll(func(f *pflag.Flag) {
if !f.Changed || f.Name == "verify-only" {
return
}
cmdArgs += fmt.Sprintf("--%s=%s ", f.Name, f.Value)
})
return fmt.Sprintf("\n// This file was automatically generated by lister-gen with arguments: %s\n\n", cmdArgs)
}
// Packages makes the client package definition.
func Packages(context *generator.Context, arguments *args.GeneratorArgs) generator.Packages {
boilerplate, err := arguments.LoadGoBoilerplate()
if err != nil {
glog.Fatalf("Failed loading boilerplate: %v", err)
}
boilerplate = append(boilerplate, []byte(generatedBy())...)
var packageList generator.Packages
for _, inputDir := range arguments.InputDirs {
p := context.Universe.Package(inputDir)
objectMeta, err := objectMetaForPackage(p)
if err != nil {
glog.Fatal(err)
}
if objectMeta == nil {
// no types in this package had genclient
continue
}
var gv clientgentypes.GroupVersion
var internalGVPkg string
if isInternal(objectMeta) {
lastSlash := strings.LastIndex(p.Path, "/")
if lastSlash == -1 {
glog.Fatalf("error constructing internal group version for package %q", p.Path)
}
gv.Group = clientgentypes.Group(p.Path[lastSlash+1:])
internalGVPkg = p.Path
} else {
parts := strings.Split(p.Path, "/")
gv.Group = clientgentypes.Group(parts[len(parts)-2])
gv.Version = clientgentypes.Version(parts[len(parts)-1])
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: packagePath,
HeaderText: boilerplate,
GeneratorFunc: func(c *generator.Context) (generators []generator.Generator) {
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: strings.ToLower(t.Name.Name),
},
outputPackage: arguments.OutputPackagePath,
groupVersion: gv,
internalGVPkg: internalGVPkg,
typeToGenerate: t,
imports: generator.NewImportTracker(),
objectMeta: objectMeta,
})
}
return generators
},
FilterFunc: func(c *generator.Context, t *types.Type) bool {
// piggy-back on types that are tagged for client-gen
return extractBoolTagOrDie("genclient", t.SecondClosestCommentLines) == true
},
})
}
return packageList
}
// objectMetaForPackage returns the type of ObjectMeta used by package p.
func objectMetaForPackage(p *types.Package) (*types.Type, error) {
generatingForPackage := false
for _, t := range p.Types {
// filter out types which dont have genclient=true.
if extractBoolTagOrDie("genclient", t.SecondClosestCommentLines) == false {
continue
}
generatingForPackage = true
for _, member := range t.Members {
if member.Name == "ObjectMeta" {
return member.Type, nil
}
}
}
if generatingForPackage {
return nil, fmt.Errorf("unable to find ObjectMeta for any types in package %s", p.Path)
}
return nil, nil
}
// isInternal returns true if t's package is k8s.io/kubernetes/pkg/api.
func isInternal(t *types.Type) bool {
return t.Name.Package == "k8s.io/kubernetes/pkg/api"
}
// listerGenerator produces a file of listers for a given GroupVersion and
// type.
type listerGenerator struct {
generator.DefaultGen
outputPackage string
groupVersion clientgentypes.GroupVersion
internalGVPkg string
typeToGenerate *types.Type
imports namer.ImportTracker
objectMeta *types.Type
}
var _ generator.Generator = &listerGenerator{}
func (g *listerGenerator) Filter(c *generator.Context, t *types.Type) bool {
return t == g.typeToGenerate
}
func (g *listerGenerator) Namers(c *generator.Context) namer.NameSystems {
return namer.NameSystems{
"raw": namer.NewRawNamer(g.outputPackage, g.imports),
}
}
func (g *listerGenerator) Imports(c *generator.Context) (imports []string) {
imports = append(imports, g.imports.ImportLines()...)
imports = append(imports, "k8s.io/kubernetes/pkg/api/errors")
imports = append(imports, "k8s.io/kubernetes/pkg/labels")
// for Indexer
imports = append(imports, "k8s.io/kubernetes/pkg/client/cache")
return
}
func (g *listerGenerator) GenerateType(c *generator.Context, t *types.Type, w io.Writer) error {
sw := generator.NewSnippetWriter(w, c, "$", "$")
glog.V(5).Infof("processing type %v", t)
m := map[string]interface{}{
"Resource": c.Universe.Function(types.Name{Package: g.internalGVPkg, Name: "Resource"}),
"type": t,
"objectMeta": g.objectMeta,
}
namespaced := !extractBoolTagOrDie("nonNamespaced", t.SecondClosestCommentLines)
if namespaced {
sw.Do(typeListerInterface, m)
} else {
sw.Do(typeListerInterface_NonNamespaced, m)
}
sw.Do(typeListerStruct, m)
sw.Do(typeListerConstructor, m)
sw.Do(typeLister_List, m)
if namespaced {
sw.Do(typeLister_NamespaceLister, m)
sw.Do(namespaceListerInterface, m)
sw.Do(namespaceListerStruct, m)
sw.Do(namespaceLister_List, m)
sw.Do(namespaceLister_Get, m)
} else {
sw.Do(typeLister_NonNamespacedGet, m)
}
return sw.Error()
}
var typeListerInterface = `
// $.type|public$Lister helps list $.type|publicPlural$.
type $.type|public$Lister interface {
// List lists all $.type|publicPlural$ in the indexer.
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
}
`
var typeListerInterface_NonNamespaced = `
// $.type|public$Lister helps list $.type|publicPlural$.
type $.type|public$Lister interface {
// List lists all $.type|publicPlural$ in the indexer.
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
}
`
var typeListerStruct = `
// $.type|private$Lister implements the $.type|public$Lister interface.
type $.type|private$Lister struct {
indexer cache.Indexer
}
`
var typeListerConstructor = `
// New$.type|public$Lister returns a new $.type|public$Lister.
func New$.type|public$Lister(indexer cache.Indexer) $.type|public$Lister {
return &$.type|private$Lister{indexer: indexer}
}
`
var typeLister_List = `
// List lists all $.type|publicPlural$ in the indexer.
func (s *$.type|private$Lister) List(selector labels.Selector) (ret []*$.type|raw$, err error) {
err = cache.ListAll(s.indexer, selector, func(m interface{}) {
ret = append(ret, m.(*$.type|raw$))
})
return ret, err
}
`
var typeLister_NamespaceLister = `
// $.type|publicPlural$ returns an object that can list and get $.type|publicPlural$.
func (s *$.type|private$Lister) $.type|publicPlural$(namespace string) $.type|public$NamespaceLister {
return $.type|private$NamespaceLister{indexer: s.indexer, namespace: namespace}
}
`
var typeLister_NonNamespacedGet = `
// Get retrieves the $.type|public$ from the index for a given name.
func (s *$.type|private$Lister) Get(name string) (*$.type|raw$, error) {
key := &$.type|raw${ObjectMeta: $.objectMeta|raw${Name: name}}
obj, exists, err := s.indexer.Get(key)
if err != nil {
return nil, err
}
if !exists {
return nil, errors.NewNotFound($.Resource|raw$("$.type|lowercaseSingular$"), name)
}
return obj.(*$.type|raw$), nil
}
`
var namespaceListerInterface = `
// $.type|public$NamespaceLister helps list and get $.type|publicPlural$.
type $.type|public$NamespaceLister interface {
// List lists all $.type|publicPlural$ in the indexer for a given namespace.
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
}
`
var namespaceListerStruct = `
// $.type|private$NamespaceLister implements the $.type|public$NamespaceLister
// interface.
type $.type|private$NamespaceLister struct {
indexer cache.Indexer
namespace string
}
`
var namespaceLister_List = `
// List lists all $.type|publicPlural$ in the indexer for a given namespace.
func (s $.type|private$NamespaceLister) List(selector labels.Selector) (ret []*$.type|raw$, err error) {
err = cache.ListAllByNamespace(s.indexer, s.namespace, selector, func(m interface{}) {
ret = append(ret, m.(*$.type|raw$))
})
return ret, err
}
`
var namespaceLister_Get = `
// Get retrieves the $.type|public$ from the indexer for a given namespace and name.
func (s $.type|private$NamespaceLister) Get(name string) (*$.type|raw$, error) {
obj, exists, err := s.indexer.GetByKey(s.namespace + "/" + name)
if err != nil {
return nil, err
}
if !exists {
return nil, errors.NewNotFound($.Resource|raw$("$.type|lowercaseSingular$"), name)
}
return obj.(*$.type|raw$), nil
}
`