mirror of https://github.com/knative/pkg.git
128 lines
4.1 KiB
Go
128 lines
4.1 KiB
Go
/*
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Copyright 2019 The Knative Authors.
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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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clientgentypes "k8s.io/code-generator/cmd/client-gen/types"
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"k8s.io/gengo/generator"
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"k8s.io/gengo/namer"
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"k8s.io/gengo/types"
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"k8s.io/klog"
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)
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// injectionTestGenerator produces a file of listers for a given GroupVersion and
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// type.
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type injectionGenerator struct {
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generator.DefaultGen
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outputPackage string
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groupVersion clientgentypes.GroupVersion
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groupGoName string
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typeToGenerate *types.Type
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imports namer.ImportTracker
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typedInformerPackage string
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groupInformerFactoryPackage string
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}
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var _ generator.Generator = (*injectionGenerator)(nil)
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func (g *injectionGenerator) Filter(c *generator.Context, t *types.Type) bool {
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// Only process the type for this informer generator.
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return t == g.typeToGenerate
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}
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func (g *injectionGenerator) Namers(c *generator.Context) namer.NameSystems {
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publicPluralNamer := &ExceptionNamer{
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Exceptions: map[string]string{
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// these exceptions are used to deconflict the generated code
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// you can put your fully qualified package like
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// to generate a name that doesn't conflict with your group.
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// "k8s.io/apis/events/v1beta1.Event": "EventResource"
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},
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KeyFunc: func(t *types.Type) string {
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return t.Name.Package + "." + t.Name.Name
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},
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Delegate: namer.NewPublicPluralNamer(map[string]string{
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"Endpoints": "Endpoints",
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}),
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}
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return namer.NameSystems{
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"raw": namer.NewRawNamer(g.outputPackage, g.imports),
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"publicPlural": publicPluralNamer,
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}
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}
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func (g *injectionGenerator) Imports(c *generator.Context) (imports []string) {
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imports = append(imports, g.imports.ImportLines()...)
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return
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}
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func (g *injectionGenerator) GenerateType(c *generator.Context, t *types.Type, w io.Writer) error {
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sw := generator.NewSnippetWriter(w, c, "{{", "}}")
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klog.V(5).Infof("processing type %v", t)
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m := map[string]interface{}{
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"group": namer.IC(g.groupGoName),
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"type": t,
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"version": namer.IC(g.groupVersion.Version.String()),
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"injectionRegisterInformer": c.Universe.Type(types.Name{Package: "knative.dev/pkg/injection", Name: "Default.RegisterInformer"}),
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"controllerInformer": c.Universe.Type(types.Name{Package: "knative.dev/pkg/controller", Name: "Informer"}),
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"informersTypedInformer": c.Universe.Type(types.Name{Package: g.typedInformerPackage, Name: t.Name.Name + "Informer"}),
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"factoryGet": c.Universe.Type(types.Name{Package: g.groupInformerFactoryPackage, Name: "Get"}),
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"loggingFromContext": c.Universe.Function(types.Name{
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Package: "knative.dev/pkg/logging",
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Name: "FromContext",
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}),
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"contextContext": c.Universe.Type(types.Name{
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Package: "context",
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Name: "Context",
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}),
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}
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sw.Do(injectionInformer, m)
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return sw.Error()
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}
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var injectionInformer = `
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func init() {
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{{.injectionRegisterInformer|raw}}(withInformer)
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}
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// Key is used for associating the Informer inside the context.Context.
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type Key struct{}
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func withInformer(ctx {{.contextContext|raw}}) ({{.contextContext|raw}}, {{.controllerInformer|raw}}) {
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f := {{.factoryGet|raw}}(ctx)
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inf := f.{{.group}}().{{.version}}().{{.type|publicPlural}}()
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return context.WithValue(ctx, Key{}, inf), inf.Informer()
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}
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// Get extracts the typed informer from the context.
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func Get(ctx {{.contextContext|raw}}) {{.informersTypedInformer|raw}} {
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untyped := ctx.Value(Key{})
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if untyped == nil {
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{{.loggingFromContext|raw}}(ctx).Panic(
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"Unable to fetch {{.informersTypedInformer}} from context.")
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}
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return untyped.({{.informersTypedInformer|raw}})
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}
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`
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