mirror of https://github.com/knative/pkg.git
138 lines
4.2 KiB
Go
138 lines
4.2 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 client
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import (
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"io"
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"path/filepath"
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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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"knative.dev/pkg/codegen/cmd/injection-gen/args"
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)
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// New creates a new clientGenerator with the given args
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func New(args *args.Args) *clientGenerator {
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return &clientGenerator{
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GoGenerator: generator.GoGenerator{
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OutputFilename: "client.go",
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},
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outputPackage: filepath.Join(args.OutputPackagePath, "client"),
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imports: generator.NewImportTracker(),
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clientSetPackage: args.VersionedClientSetPackage,
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}
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}
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// clientGenerator produces a file of listers for a given GroupVersion and
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// type.
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type clientGenerator struct {
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generator.GoGenerator
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outputPackage string
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imports namer.ImportTracker
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clientSetPackage string
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filtered bool
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}
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func (g *clientGenerator) OutputPackagePath() string {
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return g.outputPackage
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}
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var _ generator.Generator = (*clientGenerator)(nil)
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func (g *clientGenerator) Filter(c *generator.Context, t *types.Type) bool {
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// We generate a single client, 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 *clientGenerator) 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 *clientGenerator) 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 *clientGenerator) 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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"clientSetNewForConfigOrDie": c.Universe.Function(types.Name{Package: g.clientSetPackage, Name: "NewForConfigOrDie"}),
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"clientSetInterface": c.Universe.Type(types.Name{Package: g.clientSetPackage, Name: "Interface"}),
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"injectionRegisterClient": c.Universe.Function(types.Name{Package: "knative.dev/pkg/injection", Name: "Default.RegisterClient"}),
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"injectionRegisterClientFetcher": c.Universe.Function(types.Name{
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Package: "knative.dev/pkg/injection",
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Name: "Default.RegisterClientFetcher",
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}),
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"restConfig": c.Universe.Type(types.Name{Package: "k8s.io/client-go/rest", Name: "Config"}),
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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(injectionClient, m)
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return sw.Error()
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}
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var injectionClient = `
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func init() {
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{{.injectionRegisterClient|raw}}(withClientFromConfig)
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{{.injectionRegisterClientFetcher|raw}}(func(ctx context.Context) interface{} {
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return Get(ctx)
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})
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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 withClientFromConfig(ctx {{.contextContext|raw}}, cfg *{{.restConfig|raw}}) context.Context {
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return context.WithValue(ctx, Key{}, {{.clientSetNewForConfigOrDie|raw}}(cfg))
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}
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// Get extracts the {{.clientSetInterface|raw}} client from the context.
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func Get(ctx {{.contextContext|raw}}) {{.clientSetInterface|raw}} {
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untyped := ctx.Value(Key{})
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if untyped == nil {
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if injection.GetConfig(ctx) == nil {
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{{.loggingFromContext|raw}}(ctx).Panic(
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"Unable to fetch {{.clientSetInterface}} from context. This context is not the application context (which is typically given to constructors via sharedmain).")
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} else {
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{{.loggingFromContext|raw}}(ctx).Panic(
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"Unable to fetch {{.clientSetInterface}} from context.")
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}
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}
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return untyped.({{.clientSetInterface|raw}})
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}
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`
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