387 lines
12 KiB
Go
387 lines
12 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package generators
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import (
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"io"
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"path/filepath"
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"strings"
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"k8s.io/kubernetes/cmd/libs/go2idl/args"
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"k8s.io/kubernetes/cmd/libs/go2idl/generator"
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"k8s.io/kubernetes/cmd/libs/go2idl/namer"
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"k8s.io/kubernetes/cmd/libs/go2idl/types"
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"github.com/golang/glog"
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)
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// TODO: This is created only to reduce number of changes in a single PR.
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// Remove it and use PublicNamer instead.
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func deepCopyNamer() *namer.NameStrategy {
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return &namer.NameStrategy{
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Join: func(pre string, in []string, post string) string {
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return strings.Join(in, "_")
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},
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PrependPackageNames: 1,
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}
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}
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// NameSystems returns the name system used by the generators in this package.
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func NameSystems() namer.NameSystems {
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return namer.NameSystems{
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"public": deepCopyNamer(),
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"raw": namer.NewRawNamer("", nil),
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}
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}
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// DefaultNameSystem returns the default name system for ordering the types to be
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// processed by the generators in this package.
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func DefaultNameSystem() string {
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return "public"
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}
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func Packages(_ *generator.Context, arguments *args.GeneratorArgs) generator.Packages {
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boilerplate, err := arguments.LoadGoBoilerplate()
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if err != nil {
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glog.Fatalf("Failed loading boilerplate: %v", err)
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}
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packages := generator.Packages{}
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for _, inputDir := range arguments.InputDirs {
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packages = append(packages,
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&generator.DefaultPackage{
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PackageName: filepath.Base(inputDir),
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PackagePath: inputDir,
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HeaderText: append(boilerplate, []byte(
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`
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// This file was autogenerated by deepcopy-gen. Do not edit it manually!
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`)...),
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GeneratorFunc: func(c *generator.Context) (generators []generator.Generator) {
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generators = []generator.Generator{}
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// TODO: Check whether anything will be generated.
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generators = append(generators, NewGenDeepCopy("deep_copy_generated", inputDir))
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return generators
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},
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FilterFunc: func(c *generator.Context, t *types.Type) bool {
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switch t.Kind {
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case types.Func, types.Chan:
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// These types can't be copied.
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return false
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case types.Unknown, types.Unsupported:
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// These types are explicitly ignored.
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return false
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case types.Array:
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// We don't support arrays.
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return false
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}
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// Also, filter out private types.
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if strings.ToLower(t.Name.Name[:1]) == t.Name.Name[:1] {
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return false
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}
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return true
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},
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})
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}
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return packages
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}
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const (
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apiPackagePath = "k8s.io/kubernetes/pkg/api"
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conversionPackagePath = "k8s.io/kubernetes/pkg/conversion"
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)
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// genDeepCopy produces a file with a set for a single type.
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type genDeepCopy struct {
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generator.DefaultGen
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targetPackage string
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imports *generator.ImportTracker
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typesForInit []*types.Type
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}
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func NewGenDeepCopy(sanitizedName, targetPackage string) generator.Generator {
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return &genDeepCopy{
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DefaultGen: generator.DefaultGen{
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OptionalName: sanitizedName,
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},
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targetPackage: targetPackage,
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imports: generator.NewImportTracker(),
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typesForInit: make([]*types.Type, 0),
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}
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}
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func (g *genDeepCopy) Namers(c *generator.Context) namer.NameSystems {
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// Have the raw namer for this file track what it imports.
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return namer.NameSystems{"raw": namer.NewRawNamer(g.targetPackage, g.imports)}
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}
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// Filter ignores all but one type because we're making a single file per type.
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func (g *genDeepCopy) Filter(c *generator.Context, t *types.Type) bool {
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// Filter out all types not copyable within the package.
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copyable := g.copyableWithinPackage(t)
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if copyable {
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g.typesForInit = append(g.typesForInit, t)
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}
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return copyable
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}
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func (g *genDeepCopy) copyableWithinPackage(t *types.Type) bool {
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// TODO: We should generate public DeepCopy functions per directory, instead
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// of generating everything everywhere.
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// This is done that way only to minimize number of changes per PR.
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// Once this is done, we should replace HasPrefix with:
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//if t.Name.Package != g.targetPackage {
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// return false
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//}
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if !strings.HasPrefix(t.Name.Package, "k8s.io/kubernetes/") {
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return false
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}
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if types.ExtractCommentTags("+", t.CommentLines)["gencopy"] == "false" {
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return false
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}
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// TODO: Consider generating functions for other kinds too.
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if t.Kind != types.Struct {
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return false
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}
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// TODO: This should be removed once we start generating public DeepCopy
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// functions per directory.
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if t.Name.Package != g.targetPackage {
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// We won't be able to access private fields.
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// Thus, this type cannot have private fields.
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for _, member := range t.Members {
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if strings.ToLower(member.Name[:1]) == member.Name[:1] {
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return false
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}
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// TODO: This is a temporary hack, to make avoid generating function
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// for conversion.Equalities. We should get rid of it.
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if member.Embedded {
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return false
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}
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}
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}
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return true
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}
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func (g *genDeepCopy) isOtherPackage(pkg string) bool {
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if pkg == g.targetPackage {
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return false
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}
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if strings.HasSuffix(pkg, "\""+g.targetPackage+"\"") {
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return false
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}
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return true
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}
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func (g *genDeepCopy) Imports(c *generator.Context) (imports []string) {
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importLines := []string{}
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if g.isOtherPackage(apiPackagePath) {
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importLines = append(importLines, "api \""+apiPackagePath+"\"")
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}
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if g.isOtherPackage(conversionPackagePath) {
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importLines = append(importLines, "conversion \""+conversionPackagePath+"\"")
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}
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for _, singleImport := range g.imports.ImportLines() {
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if g.isOtherPackage(singleImport) {
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importLines = append(importLines, singleImport)
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}
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}
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return importLines
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}
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func (g *genDeepCopy) Init(c *generator.Context, w io.Writer) error {
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sw := generator.NewSnippetWriter(w, c, "$", "$")
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sw.Do("func init() {\n", nil)
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if g.targetPackage == apiPackagePath {
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sw.Do("if err := Scheme.AddGeneratedDeepCopyFuncs(\n", nil)
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} else {
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sw.Do("if err := api.Scheme.AddGeneratedDeepCopyFuncs(\n", nil)
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}
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for _, t := range g.typesForInit {
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sw.Do("deepCopy_$.|public$,\n", t)
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}
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sw.Do("); err != nil {\n", nil)
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sw.Do("// if one of the deep copy functions is malformed, detect it immediately.\n", nil)
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sw.Do("panic(err)\n", nil)
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sw.Do("}\n", nil)
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sw.Do("}\n\n", nil)
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return sw.Error()
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}
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// GenerateType makes the body of a file implementing a set for type t.
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func (g *genDeepCopy) GenerateType(c *generator.Context, t *types.Type, w io.Writer) error {
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sw := generator.NewSnippetWriter(w, c, "$", "$")
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sw.Do("func deepCopy_$.|public$(in $.|raw$, out *$.|raw$, c *conversion.Cloner) error {\n", t)
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g.generateFor(t, sw)
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sw.Do("return nil\n", nil)
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sw.Do("}\n\n", nil)
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return sw.Error()
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}
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// we use the system of shadowing 'in' and 'out' so that the same code is valid
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// at any nesting level. This makes the autogenerator easy to understand, and
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// the compiler shouldn't care.
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func (g *genDeepCopy) generateFor(t *types.Type, sw *generator.SnippetWriter) {
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var f func(*types.Type, *generator.SnippetWriter)
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switch t.Kind {
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case types.Builtin:
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f = g.doBuiltin
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case types.Map:
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f = g.doMap
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case types.Slice:
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f = g.doSlice
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case types.Struct:
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f = g.doStruct
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case types.Interface:
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f = g.doInterface
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case types.Pointer:
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f = g.doPointer
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case types.Alias:
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f = g.doAlias
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default:
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f = g.doUnknown
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}
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f(t, sw)
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}
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func (g *genDeepCopy) doBuiltin(t *types.Type, sw *generator.SnippetWriter) {
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sw.Do("*out = in\n", nil)
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}
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func (g *genDeepCopy) doMap(t *types.Type, sw *generator.SnippetWriter) {
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sw.Do("*out = make($.|raw$)\n", t)
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sw.Do("for key, val := range in {\n", nil)
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if t.Key.IsAssignable() {
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if t.Elem.IsAssignable() {
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sw.Do("(*out)[key] = val\n", nil)
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} else {
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if g.copyableWithinPackage(t.Elem) {
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sw.Do("newVal := new($.|raw$)\n", t.Elem)
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sw.Do("if err := deepCopy_$.|public$(val, newVal, c); err != nil {\n", t.Elem)
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sw.Do("return err\n", nil)
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sw.Do("}\n", nil)
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sw.Do("(*out)[key] = *newVal\n", nil)
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} else {
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sw.Do("if newVal, err := c.DeepCopy(val); err != nil {\n", nil)
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sw.Do("return err\n", nil)
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sw.Do("} else {\n", nil)
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sw.Do("(*out)[key] = newVal.($.|raw$)\n", t.Elem)
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sw.Do("}\n", nil)
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}
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}
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} else {
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// TODO: Implement it when necessary.
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sw.Do("// FIXME: Copying unassignable keys unsupported $.|raw$\n", t.Key)
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}
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sw.Do("}\n", nil)
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}
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func (g *genDeepCopy) doSlice(t *types.Type, sw *generator.SnippetWriter) {
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sw.Do("*out = make($.|raw$, len(in))\n", t)
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if t.Elem.Kind == types.Builtin {
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sw.Do("copy(*out, in)\n", nil)
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} else {
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sw.Do("for i := range in {\n", nil)
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if t.Elem.IsAssignable() {
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sw.Do("(*out)[i] = in[i]\n", nil)
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} else if g.copyableWithinPackage(t.Elem) {
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sw.Do("if err := deepCopy_$.|public$(in[i], &(*out)[i], c); err != nil {\n", t.Elem)
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sw.Do("return err\n", nil)
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sw.Do("}\n", nil)
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} else {
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sw.Do("if newVal, err := c.DeepCopy(in[i]); err != nil {\n", nil)
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sw.Do("return err\n", nil)
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sw.Do("} else {\n", nil)
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sw.Do("(*out)[i] = newVal.($.|raw$)\n", t.Elem)
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sw.Do("}\n", nil)
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}
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sw.Do("}\n", nil)
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}
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}
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func (g *genDeepCopy) doStruct(t *types.Type, sw *generator.SnippetWriter) {
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for _, m := range t.Members {
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args := map[string]interface{}{
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"type": m.Type,
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"name": m.Name,
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}
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switch m.Type.Kind {
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case types.Builtin:
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sw.Do("out.$.name$ = in.$.name$\n", args)
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case types.Map, types.Slice, types.Pointer:
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sw.Do("if in.$.name$ != nil {\n", args)
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sw.Do("in, out := in.$.name$, &out.$.name$\n", args)
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g.generateFor(m.Type, sw)
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sw.Do("} else {\n", nil)
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sw.Do("out.$.name$ = nil\n", args)
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sw.Do("}\n", nil)
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case types.Struct:
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if g.copyableWithinPackage(m.Type) {
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sw.Do("if err := deepCopy_$.type|public$(in.$.name$, &out.$.name$, c); err != nil {\n", args)
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sw.Do("return err\n", nil)
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sw.Do("}\n", nil)
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} else {
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sw.Do("if newVal, err := c.DeepCopy(in.$.name$); err != nil {\n", args)
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sw.Do("return err\n", nil)
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sw.Do("} else {\n", nil)
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sw.Do("out.$.name$ = newVal.($.type|raw$)\n", args)
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sw.Do("}\n", nil)
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}
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default:
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if m.Type.Kind == types.Alias && m.Type.Underlying.Kind == types.Builtin {
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sw.Do("out.$.name$ = in.$.name$\n", args)
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} else {
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sw.Do("if newVal, err := c.DeepCopy(in.$.name$); err != nil {\n", args)
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sw.Do("return err\n", nil)
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sw.Do("} else {\n", nil)
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sw.Do("out.$.name$ = newVal.($.type|raw$)\n", args)
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sw.Do("}\n", nil)
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}
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}
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}
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}
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func (g *genDeepCopy) doInterface(t *types.Type, sw *generator.SnippetWriter) {
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// TODO: Add support for interfaces.
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g.doUnknown(t, sw)
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}
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func (g *genDeepCopy) doPointer(t *types.Type, sw *generator.SnippetWriter) {
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sw.Do("*out = new($.Elem|raw$)\n", t)
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if t.Elem.Kind == types.Builtin {
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sw.Do("**out = *in", nil)
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} else if g.copyableWithinPackage(t.Elem) {
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sw.Do("if err := deepCopy_$.|public$(*in, *out, c); err != nil {\n", t.Elem)
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sw.Do("return err\n", nil)
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sw.Do("}\n", nil)
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} else {
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sw.Do("if newVal, err := c.DeepCopy(*in); err != nil {\n", nil)
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sw.Do("return err\n", nil)
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sw.Do("} else {\n", nil)
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sw.Do("**out = newVal.($.|raw$)\n", t.Elem)
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sw.Do("}\n", nil)
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}
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}
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func (g *genDeepCopy) doAlias(t *types.Type, sw *generator.SnippetWriter) {
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// TODO: Add support for aliases.
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g.doUnknown(t, sw)
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}
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func (g *genDeepCopy) doUnknown(t *types.Type, sw *generator.SnippetWriter) {
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sw.Do("// FIXME: Type $.|raw$ is unsupported.\n", t)
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}
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