mirror of https://github.com/knative/pkg.git
135 lines
3.8 KiB
Go
135 lines
3.8 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 injection
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import (
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"context"
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"k8s.io/client-go/rest"
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"knative.dev/pkg/controller"
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)
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// InformerInjector holds the type of a callback that attaches a particular
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// informer type to a context.
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type InformerInjector func(context.Context) (context.Context, controller.Informer)
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// DynamicInformerInjector holds the type of a callback that attaches a particular
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// informer type (backed by a Dynamic) to a context.
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type DynamicInformerInjector func(context.Context) context.Context
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// FilteredInformersInjector holds the type of a callback that attaches a set of particular
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// filtered informers type to a context.
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type FilteredInformersInjector func(context.Context) (context.Context, []controller.Informer)
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func (i *impl) RegisterInformer(ii InformerInjector) {
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i.m.Lock()
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defer i.m.Unlock()
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i.informers = append(i.informers, ii)
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}
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func (i *impl) RegisterDynamicInformer(ii DynamicInformerInjector) {
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i.m.Lock()
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defer i.m.Unlock()
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i.dynamicInformers = append(i.dynamicInformers, ii)
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}
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func (i *impl) RegisterFilteredInformers(fii FilteredInformersInjector) {
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i.m.Lock()
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defer i.m.Unlock()
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i.filteredInformers = append(i.filteredInformers, fii)
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}
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func (i *impl) GetInformers() []InformerInjector {
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i.m.RLock()
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defer i.m.RUnlock()
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// Copy the slice before returning.
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return append(i.informers[:0:0], i.informers...)
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}
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func (i *impl) GetDynamicInformers() []DynamicInformerInjector {
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i.m.RLock()
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defer i.m.RUnlock()
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// Copy the slice before returning.
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return append(i.dynamicInformers[:0:0], i.dynamicInformers...)
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}
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func (i *impl) GetFilteredInformers() []FilteredInformersInjector {
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i.m.RLock()
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defer i.m.RUnlock()
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// Copy the slice before returning.
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return append(i.filteredInformers[:0:0], i.filteredInformers...)
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}
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func (i *impl) SetupDynamic(ctx context.Context) context.Context {
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// Based on the reconcilers we have linked, build up a set of clients and inject
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// them onto the context.
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for _, ci := range i.GetDynamicClients() {
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ctx = ci(ctx)
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}
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// Based on the reconcilers we have linked, build up a set of informers
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// and inject them onto the context.
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for _, ii := range i.GetDynamicInformers() {
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ctx = ii(ctx)
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}
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return ctx
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}
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func (i *impl) SetupInformers(ctx context.Context, cfg *rest.Config) (context.Context, []controller.Informer) {
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// Based on the reconcilers we have linked, build up a set of clients and inject
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// them onto the context.
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for _, ci := range i.GetClients() {
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ctx = ci(ctx, cfg)
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}
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// Based on the reconcilers we have linked, build up a set of informer factories
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// and inject them onto the context.
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for _, ifi := range i.GetInformerFactories() {
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ctx = ifi(ctx)
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}
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// Based on the reconcilers we have linked, build up a set of duck informer factories
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// and inject them onto the context.
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for _, duck := range i.GetDucks() {
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ctx = duck(ctx)
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}
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// Based on the reconcilers we have linked, build up a set of informers
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// and inject them onto the context.
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var inf controller.Informer
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var filteredinfs []controller.Informer
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informers := make([]controller.Informer, 0, len(i.GetInformers()))
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for _, ii := range i.GetInformers() {
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ctx, inf = ii(ctx)
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informers = append(informers, inf)
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}
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for _, fii := range i.GetFilteredInformers() {
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ctx, filteredinfs = fii(ctx)
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informers = append(informers, filteredinfs...)
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}
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return ctx, informers
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}
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