mirror of https://github.com/knative/pkg.git
119 lines
4.3 KiB
Go
119 lines
4.3 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 factory
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import (
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"io"
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"k8s.io/gengo/v2/generator"
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"k8s.io/gengo/v2/namer"
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"k8s.io/gengo/v2/types"
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"k8s.io/klog/v2"
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)
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// factoryTestGenerator produces a file of factory injection of a given type.
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type factoryGenerator struct {
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generator.GoGenerator
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outputPackage string
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imports namer.ImportTracker
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cachingClientSetPackage string
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sharedInformerFactoryPackage string
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filtered bool
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}
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var _ generator.Generator = (*factoryGenerator)(nil)
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func (g *factoryGenerator) Filter(c *generator.Context, t *types.Type) bool {
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// We generate a single factory, so return true once.
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if !g.filtered {
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g.filtered = true
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return true
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}
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return false
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}
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func (g *factoryGenerator) Namers(c *generator.Context) namer.NameSystems {
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return namer.NameSystems{
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"raw": namer.NewRawNamer(g.outputPackage, g.imports),
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}
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}
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func (g *factoryGenerator) 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 *factoryGenerator) 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).Info("processing type ", t)
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m := map[string]interface{}{
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"cachingClientGet": c.Universe.Type(types.Name{Package: g.cachingClientSetPackage, Name: "Get"}),
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"informersNewSharedInformerFactoryWithOptions": c.Universe.Function(types.Name{Package: g.sharedInformerFactoryPackage, Name: "NewSharedInformerFactoryWithOptions"}),
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"informersSharedInformerOption": c.Universe.Function(types.Name{Package: g.sharedInformerFactoryPackage, Name: "SharedInformerOption"}),
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"informersWithNamespace": c.Universe.Function(types.Name{Package: g.sharedInformerFactoryPackage, Name: "WithNamespace"}),
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"informersSharedInformerFactory": c.Universe.Function(types.Name{Package: g.sharedInformerFactoryPackage, Name: "SharedInformerFactory"}),
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"injectionRegisterInformerFactory": c.Universe.Type(types.Name{Package: "knative.dev/pkg/injection", Name: "Default.RegisterInformerFactory"}),
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"injectionHasNamespace": c.Universe.Type(types.Name{Package: "knative.dev/pkg/injection", Name: "HasNamespaceScope"}),
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"injectionGetNamespace": c.Universe.Type(types.Name{Package: "knative.dev/pkg/injection", Name: "GetNamespaceScope"}),
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"controllerGetResyncPeriod": c.Universe.Type(types.Name{Package: "knative.dev/pkg/controller", Name: "GetResyncPeriod"}),
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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(injectionFactory, m)
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return sw.Error()
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}
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var injectionFactory = `
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func init() {
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{{.injectionRegisterInformerFactory|raw}}(withInformerFactory)
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}
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// Key is used as the key for associating information with a context.Context.
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type Key struct{}
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func withInformerFactory(ctx {{.contextContext|raw}}) {{.contextContext|raw}} {
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c := {{.cachingClientGet|raw}}(ctx)
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opts := make([]{{.informersSharedInformerOption|raw}}, 0, 1)
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if {{.injectionHasNamespace|raw}}(ctx) {
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opts = append(opts, {{.informersWithNamespace|raw}}({{.injectionGetNamespace|raw}}(ctx)))
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}
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return context.WithValue(ctx, Key{},
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{{.informersNewSharedInformerFactoryWithOptions|raw}}(c, {{.controllerGetResyncPeriod|raw}}(ctx), opts...))
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}
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// Get extracts the InformerFactory from the context.
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func Get(ctx {{.contextContext|raw}}) {{.informersSharedInformerFactory|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 {{.informersSharedInformerFactory}} from context.")
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}
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return untyped.({{.informersSharedInformerFactory|raw}})
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}
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`
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