347 lines
11 KiB
Go
347 lines
11 KiB
Go
package virtualservice
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import (
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"fmt"
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"github.com/knative/pkg/apis/istio/v1alpha3"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/client-go/kubernetes/scheme"
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v1core "k8s.io/client-go/kubernetes/typed/core/v1"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/util/metrics"
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"kubesphere.io/kubesphere/pkg/controller/virtualservice/util"
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"strings"
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logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
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istioclient "github.com/knative/pkg/client/clientset/versioned"
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istioinformers "github.com/knative/pkg/client/informers/externalversions/istio/v1alpha3"
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istiolisters "github.com/knative/pkg/client/listers/istio/v1alpha3"
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coreinformers "k8s.io/client-go/informers/core/v1"
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clientset "k8s.io/client-go/kubernetes"
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corelisters "k8s.io/client-go/listers/core/v1"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/tools/record"
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"k8s.io/client-go/util/workqueue"
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servicemeshinformers "kubesphere.io/kubesphere/pkg/client/informers/externalversions/servicemesh/v1alpha2"
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servicemeshlisters "kubesphere.io/kubesphere/pkg/client/listers/servicemesh/v1alpha2"
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"time"
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)
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const (
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// maxRetries is the number of times a service will be retried before it is dropped out of the queue.
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// With the current rate-limiter in use (5ms*2^(maxRetries-1)) the following numbers represent the
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// sequence of delays between successive queuings of a service.
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//
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// 5ms, 10ms, 20ms, 40ms, 80ms, 160ms, 320ms, 640ms, 1.3s, 2.6s, 5.1s, 10.2s, 20.4s, 41s, 82s
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maxRetries = 15
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)
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var log = logf.Log.WithName("virtualservice-controller")
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type VirtualServiceController struct {
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client clientset.Interface
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virtualServiceClient istioclient.Interface
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eventBroadcaster record.EventBroadcaster
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eventRecorder record.EventRecorder
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serviceLister corelisters.ServiceLister
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serviceSynced cache.InformerSynced
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virtualServiceLister istiolisters.VirtualServiceLister
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virtualServiceSynced cache.InformerSynced
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destinationRuleLister istiolisters.DestinationRuleLister
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destinationRuleSynced cache.InformerSynced
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strategyLister servicemeshlisters.StrategyLister
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strategySynced cache.InformerSynced
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queue workqueue.RateLimitingInterface
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workerLoopPeriod time.Duration
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}
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func NewVirtualServiceController(serviceInformer coreinformers.ServiceInformer,
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virtualServiceInformer istioinformers.VirtualServiceInformer,
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destinationRuleInformer istioinformers.DestinationRuleInformer,
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strategyInformer servicemeshinformers.StrategyInformer,
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client clientset.Interface,
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virtualServiceClient istioclient.Interface) *VirtualServiceController {
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broadcaster := record.NewBroadcaster()
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broadcaster.StartLogging(func(format string, args ...interface{}) {
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log.Info(fmt.Sprintf(format, args))
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})
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broadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: client.CoreV1().Events("")})
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recorder := broadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "virtualservice-controller"})
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if client != nil && client.CoreV1().RESTClient().GetRateLimiter() != nil {
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metrics.RegisterMetricAndTrackRateLimiterUsage("virtualservice_controller", client.CoreV1().RESTClient().GetRateLimiter())
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}
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v := &VirtualServiceController{
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client: client,
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virtualServiceClient: virtualServiceClient,
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queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "virtualservice"),
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workerLoopPeriod: time.Second,
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}
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serviceInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: v.enqueueService,
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DeleteFunc: v.enqueueService,
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UpdateFunc: func(old, cur interface{}) {
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v.enqueueService(cur)
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},
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})
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v.serviceLister = serviceInformer.Lister()
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v.serviceSynced = serviceInformer.Informer().HasSynced
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v.strategyLister = strategyInformer.Lister()
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v.strategySynced = strategyInformer.Informer().HasSynced
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strategyInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
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DeleteFunc: v.deleteStrategy,
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})
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v.destinationRuleLister = destinationRuleInformer.Lister()
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v.destinationRuleSynced = destinationRuleInformer.Informer().HasSynced
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destinationRuleInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: v.addDestinationRule,
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UpdateFunc: func(old, cur interface{}) {
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v.addDestinationRule(cur)
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},
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})
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v.virtualServiceLister = virtualServiceInformer.Lister()
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v.virtualServiceSynced = virtualServiceInformer.Informer().HasSynced
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v.eventBroadcaster = broadcaster
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v.eventRecorder = recorder
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return v
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}
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func (v *VirtualServiceController) Start(stopCh <-chan struct{}) error {
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v.Run(5, stopCh)
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return nil
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}
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func (v *VirtualServiceController) Run(workers int, stopCh <-chan struct{}) {
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defer utilruntime.HandleCrash()
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defer v.queue.ShutDown()
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log.Info("starting virtualservice controller")
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defer log.Info("shutting down virtualservice controller")
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if !controller.WaitForCacheSync("virtualservice-controller", stopCh, v.serviceSynced, v.virtualServiceSynced, v.destinationRuleSynced, v.strategySynced) {
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return
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}
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for i := 0; i < workers; i++ {
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go wait.Until(v.worker, v.workerLoopPeriod, stopCh)
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}
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<-stopCh
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}
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func (v *VirtualServiceController) enqueueService(obj interface{}) {
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key, err := controller.KeyFunc(obj)
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if err != nil {
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utilruntime.HandleError(fmt.Errorf("couldn't get key for object %+v: %v", obj, err))
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return
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}
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v.queue.Add(key)
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}
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func (v *VirtualServiceController) worker() {
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for v.processNextWorkItem() {
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}
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}
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func (v *VirtualServiceController) processNextWorkItem() bool {
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eKey, quit := v.queue.Get()
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if quit {
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return false
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}
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defer v.queue.Done(eKey)
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err := v.syncService(eKey.(string))
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v.handleErr(err, eKey)
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return true
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}
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func (v *VirtualServiceController) syncService(key string) error {
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startTime := time.Now()
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defer func() {
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log.V(4).Info("Finished syncing service virtualservice. ", "service", key, "duration", time.Since(startTime))
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}()
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namespace, name, err := cache.SplitMetaNamespaceKey(key)
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if err != nil {
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return err
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}
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service, err := v.serviceLister.Services(namespace).Get(name)
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if err != nil {
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// Delete the corresponding virtualservice, as the service has been deleted.
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err = v.virtualServiceClient.NetworkingV1alpha3().VirtualServices(namespace).Delete(name, nil)
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if err != nil && !errors.IsNotFound(err) {
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log.Error(err, "delete orphan virtualservice failed", "namespace", service.Namespace, "name", service.Name)
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return err
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}
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return nil
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}
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if len(service.Labels) < len(util.ApplicationLabels) || !util.IsApplicationComponent(&service.ObjectMeta) ||
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len(service.Spec.Ports) == 0 {
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// services don't have enough labels to create a virtualservice
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// or they don't have necessary labels
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// or they don't have any ports defined
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return nil
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}
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vs, err := v.virtualServiceLister.VirtualServices(namespace).Get(name)
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if err == nil {
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// there already is virtual service there, no need to create another one
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return nil
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}
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destinationRule, err := v.destinationRuleLister.DestinationRules(namespace).Get(name)
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if err != nil {
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if errors.IsNotFound(err) {
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// there is no destinationrule for this service
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// maybe corresponding workloads are not created yet
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return nil
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}
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log.Error(err, "Couldn't get destinationrule for service.", "service", types.NamespacedName{Name: service.Name, Namespace: service.Namespace}.String())
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return err
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}
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subsets := destinationRule.Spec.Subsets
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if len(subsets) == 0 {
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// destination rule with no subsets, not possibly
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err = fmt.Errorf("find destinationrule with no subsets for service %s", name)
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log.Error(err, "Find destinationrule with no subsets for service", "namespace", service.Namespace, "name", name)
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return err
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} else {
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vs = &v1alpha3.VirtualService{
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ObjectMeta: metav1.ObjectMeta{
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Name: name,
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Namespace: namespace,
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Labels: util.ExtractApplicationLabels(&service.ObjectMeta),
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},
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Spec: v1alpha3.VirtualServiceSpec{
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Hosts: []string{name},
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},
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}
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// check if service has TCP protocol ports
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for _, port := range service.Spec.Ports {
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var route v1alpha3.DestinationWeight
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if port.Protocol == v1.ProtocolTCP {
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route = v1alpha3.DestinationWeight{
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Destination: v1alpha3.Destination{
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Host: name,
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Subset: subsets[0].Name,
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Port: v1alpha3.PortSelector{
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Number: uint32(port.Port),
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},
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},
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Weight: 100,
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}
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// a http port, add to HTTPRoute
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if len(port.Name) > 0 && (port.Name == "http" || strings.HasPrefix(port.Name, "http-")) {
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vs.Spec.Http = []v1alpha3.HTTPRoute{{Route: []v1alpha3.DestinationWeight{route}}}
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break
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}
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// everything else treated as TCPRoute
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vs.Spec.Tcp = []v1alpha3.TCPRoute{{Route: []v1alpha3.DestinationWeight{route}}}
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}
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}
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if len(vs.Spec.Http) > 0 || len(vs.Spec.Tcp) > 0 {
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_, err := v.virtualServiceClient.NetworkingV1alpha3().VirtualServices(namespace).Create(vs)
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if err != nil {
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v.eventRecorder.Event(vs, v1.EventTypeWarning, "FailedToCreateVirtualService", fmt.Sprintf("Failed to create virtualservice for service %v/%v: %v", service.Namespace, service.Name, err))
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log.Error(err, "create virtualservice for service failed.", "service", service)
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return err
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}
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} else {
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log.Info("service doesn't have a tcp port.")
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return nil
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}
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}
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return nil
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}
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// When a destinationrule is added, figure out which service it will be used
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// and enqueue it. obj must have *v1alpha3.DestinationRule type
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func (v *VirtualServiceController) addDestinationRule(obj interface{}) {
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dr := obj.(*v1alpha3.DestinationRule)
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service, err := v.serviceLister.Services(dr.Namespace).Get(dr.Name)
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if err != nil {
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if errors.IsNotFound(err) {
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log.V(0).Info("service not created yet", "namespace", dr.Namespace, "service", dr.Name)
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return
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}
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utilruntime.HandleError(fmt.Errorf("unable to get service with name %s/%s", dr.Namespace, dr.Name))
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return
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}
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_, err = v.virtualServiceLister.VirtualServices(dr.Namespace).Get(dr.Name)
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if err != nil {
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if errors.IsNotFound(err) {
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key, err := controller.KeyFunc(service)
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if err != nil {
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utilruntime.HandleError(fmt.Errorf("get service %s/%s key failed", service.Namespace, service.Name))
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return
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}
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v.queue.Add(key)
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}
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} else {
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// Already have a virtualservice created.
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}
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return
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}
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func (v *VirtualServiceController) deleteStrategy(obj interface{}) {
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// nothing to do right now
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}
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func (v *VirtualServiceController) handleErr(err error, key interface{}) {
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if err != nil {
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v.queue.Forget(key)
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return
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}
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if v.queue.NumRequeues(key) < maxRetries {
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log.V(2).Info("Error syncing virtualservice for service retrying.", "key", key, "error", err)
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v.queue.AddRateLimited(key)
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return
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}
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log.V(4).Info("Dropping service out of the queue.", "key", key, "error", err)
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v.queue.Forget(key)
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utilruntime.HandleError(err)
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}
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