Add configmap informer factory (#2466)

injection/clients/namespacedkube/informers/core/v1/configmap/configmap.go

@@ -0,0 +1,104 @@
+/*
+Copyright 2022 The Knative Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package configmap
+
+import (
+	"context"
+
+	apicorev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
+	v1 "k8s.io/client-go/informers/core/v1"
+	kubernetes "k8s.io/client-go/kubernetes"
+	corev1 "k8s.io/client-go/listers/core/v1"
+	"k8s.io/client-go/tools/cache"
+	"knative.dev/pkg/client/injection/kube/client"
+	"knative.dev/pkg/controller"
+	"knative.dev/pkg/injection"
+	"knative.dev/pkg/injection/clients/namespacedkube/informers/factory"
+	"knative.dev/pkg/logging"
+)
+
+func init() {
+	injection.Default.RegisterInformer(withInformer)
+	injection.Dynamic.RegisterDynamicInformer(withDynamicInformer)
+}
+
+// Key is used for associating the Informer inside the context.Context.
+type Key struct{}
+
+func withInformer(ctx context.Context) (context.Context, controller.Informer) {
+	f := factory.Get(ctx)
+	inf := f.Core().V1().ConfigMaps()
+	return context.WithValue(ctx, Key{}, inf), inf.Informer()
+}
+
+func withDynamicInformer(ctx context.Context) context.Context {
+	inf := &wrapper{client: client.Get(ctx)}
+	return context.WithValue(ctx, Key{}, inf)
+}
+
+// Get extracts the typed informer from the context.
+func Get(ctx context.Context) v1.ConfigMapInformer {
+	untyped := ctx.Value(Key{})
+	if untyped == nil {
+		logging.FromContext(ctx).Panic(
+			"Unable to fetch k8s.io/client-go/informers/core/v1.ConfigMapInformer from context.")
+	}
+	return untyped.(v1.ConfigMapInformer)
+}
+
+type wrapper struct {
+	client kubernetes.Interface
+
+	namespace string
+}
+
+var _ v1.ConfigMapInformer = (*wrapper)(nil)
+var _ corev1.ConfigMapLister = (*wrapper)(nil)
+
+func (w *wrapper) Informer() cache.SharedIndexInformer {
+	return cache.NewSharedIndexInformer(nil, &apicorev1.ConfigMap{}, 0, nil)
+}
+
+func (w *wrapper) Lister() corev1.ConfigMapLister {
+	return w
+}
+
+func (w *wrapper) ConfigMaps(namespace string) corev1.ConfigMapNamespaceLister {
+	return &wrapper{client: w.client, namespace: namespace}
+}
+
+func (w *wrapper) List(selector labels.Selector) (ret []*apicorev1.ConfigMap, err error) {
+	lo, err := w.client.CoreV1().ConfigMaps(w.namespace).List(context.TODO(), metav1.ListOptions{
+		LabelSelector: selector.String(),
+		// TODO(mattmoor): Incorporate resourceVersion bounds based on staleness criteria.
+	})
+	if err != nil {
+		return nil, err
+	}
+	for idx := range lo.Items {
+		ret = append(ret, &lo.Items[idx])
+	}
+	return ret, nil
+}
+
+func (w *wrapper) Get(name string) (*apicorev1.ConfigMap, error) {
+	return w.client.CoreV1().ConfigMaps(w.namespace).Get(context.TODO(), name, metav1.GetOptions{
+		// TODO(mattmoor): Incorporate resourceVersion bounds based on staleness criteria.
+	})
+}

injection/clients/namespacedkube/informers/core/v1/configmap/fake/fake.go

@@ -0,0 +1,38 @@
+/*
+Copyright 2022 The Knative Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package fake
+
+import (
+	"context"
+
+	"knative.dev/pkg/controller"
+	"knative.dev/pkg/injection"
+	"knative.dev/pkg/injection/clients/namespacedkube/informers/core/v1/configmap"
+	"knative.dev/pkg/injection/clients/namespacedkube/informers/factory/fake"
+)
+
+var Get = configmap.Get
+
+func init() {
+	injection.Fake.RegisterInformer(withInformer)
+}
+
+func withInformer(ctx context.Context) (context.Context, controller.Informer) {
+	f := fake.Get(ctx)
+	inf := f.Core().V1().ConfigMaps()
+	return context.WithValue(ctx, configmap.Key{}, inf), inf.Informer()
+}