vendor files

vendor/k8s.io/kubernetes/pkg/kubelet/kubeletconfig/watch.go

@@ -0,0 +1,125 @@
+/*
+Copyright 2017 The Kubernetes 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 kubeletconfig
+
+import (
+	"math/rand"
+	"time"
+
+	apiv1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/fields"
+	kuberuntime "k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/watch"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/tools/cache"
+	utilequal "k8s.io/kubernetes/pkg/kubelet/kubeletconfig/util/equal"
+	utillog "k8s.io/kubernetes/pkg/kubelet/kubeletconfig/util/log"
+)
+
+// newSharedNodeInformer returns a shared informer that uses `client` to watch the Node with
+// `nodeName` for changes and respond with `addFunc`, `updateFunc`, and `deleteFunc`.
+func newSharedNodeInformer(client clientset.Interface, nodeName string,
+	addFunc func(newObj interface{}),
+	updateFunc func(oldObj interface{}, newObj interface{}),
+	deleteFunc func(deletedObj interface{})) cache.SharedInformer {
+	// select nodes by name
+	fieldselector := fields.OneTermEqualSelector("metadata.name", nodeName)
+
+	// add some randomness to resync period, which can help avoid controllers falling into lock-step
+	minResyncPeriod := 15 * time.Minute
+	factor := rand.Float64() + 1
+	resyncPeriod := time.Duration(float64(minResyncPeriod.Nanoseconds()) * factor)
+
+	lw := &cache.ListWatch{
+		ListFunc: func(options metav1.ListOptions) (kuberuntime.Object, error) {
+			return client.CoreV1().Nodes().List(metav1.ListOptions{
+				FieldSelector: fieldselector.String(),
+			})
+		},
+		WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
+			return client.CoreV1().Nodes().Watch(metav1.ListOptions{
+				FieldSelector:   fieldselector.String(),
+				ResourceVersion: options.ResourceVersion,
+			})
+		},
+	}
+
+	handler := cache.ResourceEventHandlerFuncs{
+		AddFunc:    addFunc,
+		UpdateFunc: updateFunc,
+		DeleteFunc: deleteFunc,
+	}
+
+	informer := cache.NewSharedInformer(lw, &apiv1.Node{}, resyncPeriod)
+	informer.AddEventHandler(handler)
+
+	return informer
+}
+
+// onAddNodeEvent calls onUpdateNodeEvent with the new object and a nil old object
+func (cc *Controller) onAddNodeEvent(newObj interface{}) {
+	cc.onUpdateNodeEvent(nil, newObj)
+}
+
+// onUpdateNodeEvent checks whether the configSource changed between oldObj and newObj, and pokes the
+// configuration sync worker if there was a change
+func (cc *Controller) onUpdateNodeEvent(oldObj interface{}, newObj interface{}) {
+	newNode, ok := newObj.(*apiv1.Node)
+	if !ok {
+		utillog.Errorf("failed to cast new object to Node, couldn't handle event")
+		return
+	}
+	if oldObj == nil {
+		// Node was just added, need to sync
+		cc.pokeConfigSourceWorker()
+		return
+	}
+	oldNode, ok := oldObj.(*apiv1.Node)
+	if !ok {
+		utillog.Errorf("failed to cast old object to Node, couldn't handle event")
+		return
+	}
+	if !utilequal.ConfigSourceEq(oldNode.Spec.ConfigSource, newNode.Spec.ConfigSource) {
+		cc.pokeConfigSourceWorker()
+	}
+}
+
+// onDeleteNodeEvent logs a message if the Node was deleted and may log errors
+// if an unexpected DeletedFinalStateUnknown was received.
+// We allow the sync-loop to continue, because it is possible that the Kubelet detected
+// a Node with unexpected externalID and is attempting to delete and re-create the Node
+// (see pkg/kubelet/kubelet_node_status.go), or that someone accidently deleted the Node
+// (the Kubelet will re-create it).
+func (cc *Controller) onDeleteNodeEvent(deletedObj interface{}) {
+	node, ok := deletedObj.(*apiv1.Node)
+	if !ok {
+		tombstone, ok := deletedObj.(cache.DeletedFinalStateUnknown)
+		if !ok {
+			utillog.Errorf("couldn't cast deleted object to DeletedFinalStateUnknown, object: %+v", deletedObj)
+			return
+		}
+		node, ok = tombstone.Obj.(*apiv1.Node)
+		if !ok {
+			utillog.Errorf("received DeletedFinalStateUnknown object but it did not contain a Node, object: %+v", deletedObj)
+			return
+		}
+		utillog.Infof("Node was deleted (DeletedFinalStateUnknown), sync-loop will continue because the Kubelet might recreate the Node, node: %+v", node)
+		return
+	}
+	utillog.Infof("Node was deleted, sync-loop will continue because the Kubelet might recreate the Node, node: %+v", node)
+}