mirror of
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264 lines
8.3 KiB
Go
264 lines
8.3 KiB
Go
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/*
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Copyright 2014 The Kubernetes 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 config
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import (
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"fmt"
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"time"
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"github.com/golang/glog"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/client-go/tools/cache"
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api "k8s.io/kubernetes/pkg/apis/core"
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coreinformers "k8s.io/kubernetes/pkg/client/informers/informers_generated/internalversion/core/internalversion"
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listers "k8s.io/kubernetes/pkg/client/listers/core/internalversion"
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"k8s.io/kubernetes/pkg/controller"
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)
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// ServiceHandler is an abstract interface of objects which receive
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// notifications about service object changes.
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type ServiceHandler interface {
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// OnServiceAdd is called whenever creation of new service object
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// is observed.
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OnServiceAdd(service *api.Service)
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// OnServiceUpdate is called whenever modification of an existing
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// service object is observed.
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OnServiceUpdate(oldService, service *api.Service)
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// OnServiceDelete is called whenever deletion of an existing service
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// object is observed.
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OnServiceDelete(service *api.Service)
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// OnServiceSynced is called once all the initial even handlers were
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// called and the state is fully propagated to local cache.
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OnServiceSynced()
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}
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// EndpointsHandler is an abstract interface of objects which receive
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// notifications about endpoints object changes.
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type EndpointsHandler interface {
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// OnEndpointsAdd is called whenever creation of new endpoints object
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// is observed.
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OnEndpointsAdd(endpoints *api.Endpoints)
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// OnEndpointsUpdate is called whenever modification of an existing
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// endpoints object is observed.
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OnEndpointsUpdate(oldEndpoints, endpoints *api.Endpoints)
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// OnEndpointsDelete is called whever deletion of an existing endpoints
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// object is observed.
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OnEndpointsDelete(endpoints *api.Endpoints)
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// OnEndpointsSynced is called once all the initial event handlers were
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// called and the state is fully propagated to local cache.
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OnEndpointsSynced()
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}
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// EndpointsConfig tracks a set of endpoints configurations.
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// It accepts "set", "add" and "remove" operations of endpoints via channels, and invokes registered handlers on change.
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type EndpointsConfig struct {
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lister listers.EndpointsLister
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listerSynced cache.InformerSynced
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eventHandlers []EndpointsHandler
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}
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// NewEndpointsConfig creates a new EndpointsConfig.
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func NewEndpointsConfig(endpointsInformer coreinformers.EndpointsInformer, resyncPeriod time.Duration) *EndpointsConfig {
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result := &EndpointsConfig{
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lister: endpointsInformer.Lister(),
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listerSynced: endpointsInformer.Informer().HasSynced,
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}
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endpointsInformer.Informer().AddEventHandlerWithResyncPeriod(
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cache.ResourceEventHandlerFuncs{
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AddFunc: result.handleAddEndpoints,
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UpdateFunc: result.handleUpdateEndpoints,
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DeleteFunc: result.handleDeleteEndpoints,
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},
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resyncPeriod,
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)
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return result
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}
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// RegisterEventHandler registers a handler which is called on every endpoints change.
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func (c *EndpointsConfig) RegisterEventHandler(handler EndpointsHandler) {
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c.eventHandlers = append(c.eventHandlers, handler)
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}
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// Run starts the goroutine responsible for calling registered handlers.
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func (c *EndpointsConfig) Run(stopCh <-chan struct{}) {
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defer utilruntime.HandleCrash()
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glog.Info("Starting endpoints config controller")
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defer glog.Info("Shutting down endpoints config controller")
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if !controller.WaitForCacheSync("endpoints config", stopCh, c.listerSynced) {
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return
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}
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for i := range c.eventHandlers {
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glog.V(3).Infof("Calling handler.OnEndpointsSynced()")
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c.eventHandlers[i].OnEndpointsSynced()
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}
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<-stopCh
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}
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func (c *EndpointsConfig) handleAddEndpoints(obj interface{}) {
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endpoints, ok := obj.(*api.Endpoints)
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if !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", obj))
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return
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}
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for i := range c.eventHandlers {
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glog.V(4).Infof("Calling handler.OnEndpointsAdd")
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c.eventHandlers[i].OnEndpointsAdd(endpoints)
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}
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}
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func (c *EndpointsConfig) handleUpdateEndpoints(oldObj, newObj interface{}) {
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oldEndpoints, ok := oldObj.(*api.Endpoints)
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if !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", oldObj))
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return
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}
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endpoints, ok := newObj.(*api.Endpoints)
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if !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", newObj))
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return
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}
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for i := range c.eventHandlers {
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glog.V(4).Infof("Calling handler.OnEndpointsUpdate")
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c.eventHandlers[i].OnEndpointsUpdate(oldEndpoints, endpoints)
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}
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}
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func (c *EndpointsConfig) handleDeleteEndpoints(obj interface{}) {
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endpoints, ok := obj.(*api.Endpoints)
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if !ok {
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tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
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if !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", obj))
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return
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}
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if endpoints, ok = tombstone.Obj.(*api.Endpoints); !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", obj))
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return
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}
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}
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for i := range c.eventHandlers {
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glog.V(4).Infof("Calling handler.OnEndpointsDelete")
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c.eventHandlers[i].OnEndpointsDelete(endpoints)
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}
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}
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// ServiceConfig tracks a set of service configurations.
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// It accepts "set", "add" and "remove" operations of services via channels, and invokes registered handlers on change.
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type ServiceConfig struct {
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lister listers.ServiceLister
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listerSynced cache.InformerSynced
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eventHandlers []ServiceHandler
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}
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// NewServiceConfig creates a new ServiceConfig.
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func NewServiceConfig(serviceInformer coreinformers.ServiceInformer, resyncPeriod time.Duration) *ServiceConfig {
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result := &ServiceConfig{
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lister: serviceInformer.Lister(),
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listerSynced: serviceInformer.Informer().HasSynced,
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}
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serviceInformer.Informer().AddEventHandlerWithResyncPeriod(
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cache.ResourceEventHandlerFuncs{
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AddFunc: result.handleAddService,
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UpdateFunc: result.handleUpdateService,
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DeleteFunc: result.handleDeleteService,
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},
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resyncPeriod,
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)
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return result
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}
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// RegisterEventHandler registers a handler which is called on every service change.
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func (c *ServiceConfig) RegisterEventHandler(handler ServiceHandler) {
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c.eventHandlers = append(c.eventHandlers, handler)
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}
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// Run starts the goroutine responsible for calling
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// registered handlers.
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func (c *ServiceConfig) Run(stopCh <-chan struct{}) {
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defer utilruntime.HandleCrash()
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glog.Info("Starting service config controller")
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defer glog.Info("Shutting down service config controller")
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if !controller.WaitForCacheSync("service config", stopCh, c.listerSynced) {
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return
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}
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for i := range c.eventHandlers {
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glog.V(3).Infof("Calling handler.OnServiceSynced()")
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c.eventHandlers[i].OnServiceSynced()
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}
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<-stopCh
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}
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func (c *ServiceConfig) handleAddService(obj interface{}) {
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service, ok := obj.(*api.Service)
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if !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", obj))
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return
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}
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for i := range c.eventHandlers {
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glog.V(4).Infof("Calling handler.OnServiceAdd")
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c.eventHandlers[i].OnServiceAdd(service)
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}
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}
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func (c *ServiceConfig) handleUpdateService(oldObj, newObj interface{}) {
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oldService, ok := oldObj.(*api.Service)
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if !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", oldObj))
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return
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}
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service, ok := newObj.(*api.Service)
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if !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", newObj))
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return
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}
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for i := range c.eventHandlers {
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glog.V(4).Infof("Calling handler.OnServiceUpdate")
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c.eventHandlers[i].OnServiceUpdate(oldService, service)
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}
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}
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func (c *ServiceConfig) handleDeleteService(obj interface{}) {
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service, ok := obj.(*api.Service)
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if !ok {
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tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
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if !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", obj))
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return
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}
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if service, ok = tombstone.Obj.(*api.Service); !ok {
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utilruntime.HandleError(fmt.Errorf("unexpected object type: %v", obj))
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return
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}
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}
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for i := range c.eventHandlers {
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glog.V(4).Infof("Calling handler.OnServiceDelete")
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c.eventHandlers[i].OnServiceDelete(service)
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}
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}
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