kubernetes available_controller 源码
kubernetes available_controller 代码
文件路径：/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/available_controller.go
/*
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 apiserver
import (
"context"
"fmt"
"net"
"net/http"
"net/url"
"reflect"
"sync"
"time"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/equality"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
utilnet "k8s.io/apimachinery/pkg/util/net"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apiserver/pkg/server/egressselector"
v1informers "k8s.io/client-go/informers/core/v1"
v1listers "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/transport"
"k8s.io/client-go/util/workqueue"
"k8s.io/component-base/metrics/legacyregistry"
"k8s.io/klog/v2"
apiregistrationv1 "k8s.io/kube-aggregator/pkg/apis/apiregistration/v1"
apiregistrationv1apihelper "k8s.io/kube-aggregator/pkg/apis/apiregistration/v1/helper"
apiregistrationclient "k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset/typed/apiregistration/v1"
informers "k8s.io/kube-aggregator/pkg/client/informers/externalversions/apiregistration/v1"
listers "k8s.io/kube-aggregator/pkg/client/listers/apiregistration/v1"
"k8s.io/kube-aggregator/pkg/controllers"
)
// making sure we only register metrics once into legacy registry
var registerIntoLegacyRegistryOnce sync.Once
type certKeyFunc func() ([]byte, []byte)
// ServiceResolver knows how to convert a service reference into an actual location.
type ServiceResolver interface {
ResolveEndpoint(namespace, name string, port int32) (*url.URL, error)
}
// AvailableConditionController handles checking the availability of registered API services.
type AvailableConditionController struct {
apiServiceClient apiregistrationclient.APIServicesGetter
apiServiceLister listers.APIServiceLister
apiServiceSynced cache.InformerSynced
// serviceLister is used to get the IP to create the transport for
serviceLister v1listers.ServiceLister
servicesSynced cache.InformerSynced
endpointsLister v1listers.EndpointsLister
endpointsSynced cache.InformerSynced
// dialContext specifies the dial function for creating unencrypted TCP connections.
dialContext func(ctx context.Context, network, address string) (net.Conn, error)
proxyCurrentCertKeyContent certKeyFunc
serviceResolver ServiceResolver
// To allow injection for testing.
syncFn func(key string) error
queue workqueue.RateLimitingInterface
// map from service-namespace -> service-name -> apiservice names
cache map[string]map[string][]string
// this lock protects operations on the above cache
cacheLock sync.RWMutex
// TLS config with customized dialer cannot be cached by the client-go
// tlsTransportCache. Use a local cache here to reduce the chance of
// the controller spamming idle connections with short-lived transports.
// NOTE: the cache works because we assume that the transports constructed
// by the controller only vary on the dynamic cert/key.
tlsCache *tlsTransportCache
// metrics registered into legacy registry
metrics *availabilityMetrics
}
type tlsTransportCache struct {
mu sync.Mutex
transports map[tlsCacheKey]http.RoundTripper
}
func (c *tlsTransportCache) get(config *rest.Config) (http.RoundTripper, error) {
// If the available controller doesn't customzie the dialer (and we know from
// the code that the controller doesn't customzie other functions i.e. Proxy
// and GetCert (ExecProvider)), the config is cacheable by the client-go TLS
// transport cache. Let's skip the local cache and depend on the client-go cache.
if config.Dial == nil {
return rest.TransportFor(config)
}
c.mu.Lock()
defer c.mu.Unlock()
// See if we already have a custom transport for this config
key := tlsConfigKey(config)
if t, ok := c.transports[key]; ok {
return t, nil
}
restTransport, err := rest.TransportFor(config)
if err != nil {
return nil, err
}
c.transports[key] = restTransport
return restTransport, nil
}
type tlsCacheKey struct {
certData string
keyData string `datapolicy:"secret-key"`
}
func tlsConfigKey(c *rest.Config) tlsCacheKey {
return tlsCacheKey{
certData: string(c.TLSClientConfig.CertData),
keyData: string(c.TLSClientConfig.KeyData),
}
}
// NewAvailableConditionController returns a new AvailableConditionController.
func NewAvailableConditionController(
apiServiceInformer informers.APIServiceInformer,
serviceInformer v1informers.ServiceInformer,
endpointsInformer v1informers.EndpointsInformer,
apiServiceClient apiregistrationclient.APIServicesGetter,
proxyTransport *http.Transport,
proxyCurrentCertKeyContent certKeyFunc,
serviceResolver ServiceResolver,
egressSelector *egressselector.EgressSelector,
) (*AvailableConditionController, error) {
c := &AvailableConditionController{
apiServiceClient: apiServiceClient,
apiServiceLister: apiServiceInformer.Lister(),
apiServiceSynced: apiServiceInformer.Informer().HasSynced,
serviceLister: serviceInformer.Lister(),
servicesSynced: serviceInformer.Informer().HasSynced,
endpointsLister: endpointsInformer.Lister(),
endpointsSynced: endpointsInformer.Informer().HasSynced,
serviceResolver: serviceResolver,
queue: workqueue.NewNamedRateLimitingQueue(
// We want a fairly tight requeue time. The controller listens to the API, but because it relies on the routability of the
// service network, it is possible for an external, non-watchable factor to affect availability. This keeps
// the maximum disruption time to a minimum, but it does prevent hot loops.
workqueue.NewItemExponentialFailureRateLimiter(5*time.Millisecond, 30*time.Second),
"AvailableConditionController"),
proxyCurrentCertKeyContent: proxyCurrentCertKeyContent,
tlsCache: &tlsTransportCache{transports: make(map[tlsCacheKey]http.RoundTripper)},
metrics: newAvailabilityMetrics(),
}
if egressSelector != nil {
networkContext := egressselector.Cluster.AsNetworkContext()
var egressDialer utilnet.DialFunc
egressDialer, err := egressSelector.Lookup(networkContext)
if err != nil {
return nil, err
}
c.dialContext = egressDialer
} else if proxyTransport != nil && proxyTransport.DialContext != nil {
c.dialContext = proxyTransport.DialContext
}
// resync on this one because it is low cardinality and rechecking the actual discovery
// allows us to detect health in a more timely fashion when network connectivity to
// nodes is snipped, but the network still attempts to route there. See
// https://github.com/openshift/origin/issues/17159#issuecomment-341798063
apiServiceInformer.Informer().AddEventHandlerWithResyncPeriod(
cache.ResourceEventHandlerFuncs{
AddFunc: c.addAPIService,
UpdateFunc: c.updateAPIService,
DeleteFunc: c.deleteAPIService,
},
30*time.Second)
serviceInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.addService,
UpdateFunc: c.updateService,
DeleteFunc: c.deleteService,
})
endpointsInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.addEndpoints,
UpdateFunc: c.updateEndpoints,
DeleteFunc: c.deleteEndpoints,
})
c.syncFn = c.sync
// TODO: decouple from legacyregistry
var err error
registerIntoLegacyRegistryOnce.Do(func() {
err = c.metrics.Register(legacyregistry.Register, legacyregistry.CustomRegister)
})
if err != nil {
return nil, err
}
return c, nil
}
func (c *AvailableConditionController) sync(key string) error {
originalAPIService, err := c.apiServiceLister.Get(key)
if apierrors.IsNotFound(err) {
c.metrics.ForgetAPIService(key)
return nil
}
if err != nil {
return err
}
// if a particular transport was specified, use that otherwise build one
// construct an http client that will ignore TLS verification (if someone owns the network and messes with your status
// that's not so bad) and sets a very short timeout. This is a best effort GET that provides no additional information
restConfig := &rest.Config{
TLSClientConfig: rest.TLSClientConfig{
Insecure: true,
},
}
if c.proxyCurrentCertKeyContent != nil {
proxyClientCert, proxyClientKey := c.proxyCurrentCertKeyContent()
restConfig.TLSClientConfig.CertData = proxyClientCert
restConfig.TLSClientConfig.KeyData = proxyClientKey
}
if c.dialContext != nil {
restConfig.Dial = c.dialContext
}
// TLS config with customized dialer cannot be cached by the client-go
// tlsTransportCache. Use a local cache here to reduce the chance of
// the controller spamming idle connections with short-lived transports.
// NOTE: the cache works because we assume that the transports constructed
// by the controller only vary on the dynamic cert/key.
restTransport, err := c.tlsCache.get(restConfig)
if err != nil {
return err
}
discoveryClient := &http.Client{
Transport: restTransport,
// the request should happen quickly.
Timeout: 5 * time.Second,
}
apiService := originalAPIService.DeepCopy()
availableCondition := apiregistrationv1.APIServiceCondition{
Type: apiregistrationv1.Available,
Status: apiregistrationv1.ConditionTrue,
LastTransitionTime: metav1.Now(),
}
// local API services are always considered available
if apiService.Spec.Service == nil {
apiregistrationv1apihelper.SetAPIServiceCondition(apiService, apiregistrationv1apihelper.NewLocalAvailableAPIServiceCondition())
_, err := c.updateAPIServiceStatus(originalAPIService, apiService)
return err
}
service, err := c.serviceLister.Services(apiService.Spec.Service.Namespace).Get(apiService.Spec.Service.Name)
if apierrors.IsNotFound(err) {
availableCondition.Status = apiregistrationv1.ConditionFalse
availableCondition.Reason = "ServiceNotFound"
availableCondition.Message = fmt.Sprintf("service/%s in %q is not present", apiService.Spec.Service.Name, apiService.Spec.Service.Namespace)
apiregistrationv1apihelper.SetAPIServiceCondition(apiService, availableCondition)
_, err := c.updateAPIServiceStatus(originalAPIService, apiService)
return err
} else if err != nil {
availableCondition.Status = apiregistrationv1.ConditionUnknown
availableCondition.Reason = "ServiceAccessError"
availableCondition.Message = fmt.Sprintf("service/%s in %q cannot be checked due to: %v", apiService.Spec.Service.Name, apiService.Spec.Service.Namespace, err)
apiregistrationv1apihelper.SetAPIServiceCondition(apiService, availableCondition)
_, err := c.updateAPIServiceStatus(originalAPIService, apiService)
return err
}
if service.Spec.Type == v1.ServiceTypeClusterIP {
// if we have a cluster IP service, it must be listening on configured port and we can check that
servicePort := apiService.Spec.Service.Port
portName := ""
foundPort := false
for _, port := range service.Spec.Ports {
if port.Port == *servicePort {
foundPort = true
portName = port.Name
break
}
}
if !foundPort {
availableCondition.Status = apiregistrationv1.ConditionFalse
availableCondition.Reason = "ServicePortError"
availableCondition.Message = fmt.Sprintf("service/%s in %q is not listening on port %d", apiService.Spec.Service.Name, apiService.Spec.Service.Namespace, *apiService.Spec.Service.Port)
apiregistrationv1apihelper.SetAPIServiceCondition(apiService, availableCondition)
_, err := c.updateAPIServiceStatus(originalAPIService, apiService)
return err
}
endpoints, err := c.endpointsLister.Endpoints(apiService.Spec.Service.Namespace).Get(apiService.Spec.Service.Name)
if apierrors.IsNotFound(err) {
availableCondition.Status = apiregistrationv1.ConditionFalse
availableCondition.Reason = "EndpointsNotFound"
availableCondition.Message = fmt.Sprintf("cannot find endpoints for service/%s in %q", apiService.Spec.Service.Name, apiService.Spec.Service.Namespace)
apiregistrationv1apihelper.SetAPIServiceCondition(apiService, availableCondition)
_, err := c.updateAPIServiceStatus(originalAPIService, apiService)
return err
} else if err != nil {
availableCondition.Status = apiregistrationv1.ConditionUnknown
availableCondition.Reason = "EndpointsAccessError"
availableCondition.Message = fmt.Sprintf("service/%s in %q cannot be checked due to: %v", apiService.Spec.Service.Name, apiService.Spec.Service.Namespace, err)
apiregistrationv1apihelper.SetAPIServiceCondition(apiService, availableCondition)
_, err := c.updateAPIServiceStatus(originalAPIService, apiService)
return err
}
hasActiveEndpoints := false
outer:
for _, subset := range endpoints.Subsets {
if len(subset.Addresses) == 0 {
continue
}
for _, endpointPort := range subset.Ports {
if endpointPort.Name == portName {
hasActiveEndpoints = true
break outer
}
}
}
if !hasActiveEndpoints {
availableCondition.Status = apiregistrationv1.ConditionFalse
availableCondition.Reason = "MissingEndpoints"
availableCondition.Message = fmt.Sprintf("endpoints for service/%s in %q have no addresses with port name %q", apiService.Spec.Service.Name, apiService.Spec.Service.Namespace, portName)
apiregistrationv1apihelper.SetAPIServiceCondition(apiService, availableCondition)
_, err := c.updateAPIServiceStatus(originalAPIService, apiService)
return err
}
}
// actually try to hit the discovery endpoint when it isn't local and when we're routing as a service.
if apiService.Spec.Service != nil && c.serviceResolver != nil {
attempts := 5
results := make(chan error, attempts)
for i := 0; i < attempts; i++ {
go func() {
discoveryURL, err := c.serviceResolver.ResolveEndpoint(apiService.Spec.Service.Namespace, apiService.Spec.Service.Name, *apiService.Spec.Service.Port)
if err != nil {
results <- err
return
}
// render legacyAPIService health check path when it is delegated to a service
if apiService.Name == "v1." {
discoveryURL.Path = "/api/" + apiService.Spec.Version
} else {
discoveryURL.Path = "/apis/" + apiService.Spec.Group + "/" + apiService.Spec.Version
}
errCh := make(chan error, 1)
go func() {
// be sure to check a URL that the aggregated API server is required to serve
newReq, err := http.NewRequest("GET", discoveryURL.String(), nil)
if err != nil {
errCh <- err
return
}
// setting the system-masters identity ensures that we will always have access rights
transport.SetAuthProxyHeaders(newReq, "system:kube-aggregator", []string{"system:masters"}, nil)
resp, err := discoveryClient.Do(newReq)
if resp != nil {
resp.Body.Close()
// we should always been in the 200s or 300s
if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusMultipleChoices {
errCh <- fmt.Errorf("bad status from %v: %v", discoveryURL, resp.StatusCode)
return
}
}
errCh <- err
}()
select {
case err = <-errCh:
if err != nil {
results <- fmt.Errorf("failing or missing response from %v: %v", discoveryURL, err)
return
}
// we had trouble with slow dial and DNS responses causing us to wait too long.
// we added this as insurance
case <-time.After(6 * time.Second):
results <- fmt.Errorf("timed out waiting for %v", discoveryURL)
return
}
results <- nil
}()
}
var lastError error
for i := 0; i < attempts; i++ {
lastError = <-results
// if we had at least one success, we are successful overall and we can return now
if lastError == nil {
break
}
}
if lastError != nil {
availableCondition.Status = apiregistrationv1.ConditionFalse
availableCondition.Reason = "FailedDiscoveryCheck"
availableCondition.Message = lastError.Error()
apiregistrationv1apihelper.SetAPIServiceCondition(apiService, availableCondition)
_, updateErr := c.updateAPIServiceStatus(originalAPIService, apiService)
if updateErr != nil {
return updateErr
}
// force a requeue to make it very obvious that this will be retried at some point in the future
// along with other requeues done via service change, endpoint change, and resync
return lastError
}
}
availableCondition.Reason = "Passed"
availableCondition.Message = "all checks passed"
apiregistrationv1apihelper.SetAPIServiceCondition(apiService, availableCondition)
_, err = c.updateAPIServiceStatus(originalAPIService, apiService)
return err
}
// updateAPIServiceStatus only issues an update if a change is detected. We have a tight resync loop to quickly detect dead
// apiservices. Doing that means we don't want to quickly issue no-op updates.
func (c *AvailableConditionController) updateAPIServiceStatus(originalAPIService, newAPIService *apiregistrationv1.APIService) (*apiregistrationv1.APIService, error) {
// update this metric on every sync operation to reflect the actual state
c.setUnavailableGauge(newAPIService)
if equality.Semantic.DeepEqual(originalAPIService.Status, newAPIService.Status) {
return newAPIService, nil
}
orig := apiregistrationv1apihelper.GetAPIServiceConditionByType(originalAPIService, apiregistrationv1.Available)
now := apiregistrationv1apihelper.GetAPIServiceConditionByType(newAPIService, apiregistrationv1.Available)
unknown := apiregistrationv1.APIServiceCondition{
Type: apiregistrationv1.Available,
Status: apiregistrationv1.ConditionUnknown,
}
if orig == nil {
orig = &unknown
}
if now == nil {
now = &unknown
}
if *orig != *now {
klog.V(2).InfoS("changing APIService availability", "name", newAPIService.Name, "oldStatus", orig.Status, "newStatus", now.Status, "message", now.Message, "reason", now.Reason)
}
newAPIService, err := c.apiServiceClient.APIServices().UpdateStatus(context.TODO(), newAPIService, metav1.UpdateOptions{})
if err != nil {
return nil, err
}
c.setUnavailableCounter(originalAPIService, newAPIService)
return newAPIService, nil
}
// Run starts the AvailableConditionController loop which manages the availability condition of API services.
func (c *AvailableConditionController) Run(workers int, stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
defer c.queue.ShutDown()
klog.Info("Starting AvailableConditionController")
defer klog.Info("Shutting down AvailableConditionController")
if !controllers.WaitForCacheSync("AvailableConditionController", stopCh, c.apiServiceSynced, c.servicesSynced, c.endpointsSynced) {
return
}
for i := 0; i < workers; i++ {
go wait.Until(c.runWorker, time.Second, stopCh)
}
<-stopCh
}
func (c *AvailableConditionController) runWorker() {
for c.processNextWorkItem() {
}
}
// processNextWorkItem deals with one key off the queue. It returns false when it's time to quit.
func (c *AvailableConditionController) processNextWorkItem() bool {
key, quit := c.queue.Get()
if quit {
return false
}
defer c.queue.Done(key)
err := c.syncFn(key.(string))
if err == nil {
c.queue.Forget(key)
return true
}
utilruntime.HandleError(fmt.Errorf("%v failed with: %v", key, err))
c.queue.AddRateLimited(key)
return true
}
func (c *AvailableConditionController) addAPIService(obj interface{}) {
castObj := obj.(*apiregistrationv1.APIService)
klog.V(4).Infof("Adding %s", castObj.Name)
if castObj.Spec.Service != nil {
c.rebuildAPIServiceCache()
}
c.queue.Add(castObj.Name)
}
func (c *AvailableConditionController) updateAPIService(oldObj, newObj interface{}) {
castObj := newObj.(*apiregistrationv1.APIService)
oldCastObj := oldObj.(*apiregistrationv1.APIService)
klog.V(4).Infof("Updating %s", oldCastObj.Name)
if !reflect.DeepEqual(castObj.Spec.Service, oldCastObj.Spec.Service) {
c.rebuildAPIServiceCache()
}
c.queue.Add(oldCastObj.Name)
}
func (c *AvailableConditionController) deleteAPIService(obj interface{}) {
castObj, ok := obj.(*apiregistrationv1.APIService)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
klog.Errorf("Couldn't get object from tombstone %#v", obj)
return
}
castObj, ok = tombstone.Obj.(*apiregistrationv1.APIService)
if !ok {
klog.Errorf("Tombstone contained object that is not expected %#v", obj)
return
}
}
klog.V(4).Infof("Deleting %q", castObj.Name)
if castObj.Spec.Service != nil {
c.rebuildAPIServiceCache()
}
c.queue.Add(castObj.Name)
}
func (c *AvailableConditionController) getAPIServicesFor(obj runtime.Object) []string {
metadata, err := meta.Accessor(obj)
if err != nil {
utilruntime.HandleError(err)
return nil
}
c.cacheLock.RLock()
defer c.cacheLock.RUnlock()
return c.cache[metadata.GetNamespace()][metadata.GetName()]
}
// if the service/endpoint handler wins the race against the cache rebuilding, it may queue a no-longer-relevant apiservice
// (which will get processed an extra time - this doesn't matter),
// and miss a newly relevant apiservice (which will get queued by the apiservice handler)
func (c *AvailableConditionController) rebuildAPIServiceCache() {
apiServiceList, _ := c.apiServiceLister.List(labels.Everything())
newCache := map[string]map[string][]string{}
for _, apiService := range apiServiceList {
if apiService.Spec.Service == nil {
continue
}
if newCache[apiService.Spec.Service.Namespace] == nil {
newCache[apiService.Spec.Service.Namespace] = map[string][]string{}
}
newCache[apiService.Spec.Service.Namespace][apiService.Spec.Service.Name] = append(newCache[apiService.Spec.Service.Namespace][apiService.Spec.Service.Name], apiService.Name)
}
c.cacheLock.Lock()
defer c.cacheLock.Unlock()
c.cache = newCache
}
// TODO, think of a way to avoid checking on every service manipulation
func (c *AvailableConditionController) addService(obj interface{}) {
for _, apiService := range c.getAPIServicesFor(obj.(*v1.Service)) {
c.queue.Add(apiService)
}
}
func (c *AvailableConditionController) updateService(obj, _ interface{}) {
for _, apiService := range c.getAPIServicesFor(obj.(*v1.Service)) {
c.queue.Add(apiService)
}
}
func (c *AvailableConditionController) deleteService(obj interface{}) {
castObj, ok := obj.(*v1.Service)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
klog.Errorf("Couldn't get object from tombstone %#v", obj)
return
}
castObj, ok = tombstone.Obj.(*v1.Service)
if !ok {
klog.Errorf("Tombstone contained object that is not expected %#v", obj)
return
}
}
for _, apiService := range c.getAPIServicesFor(castObj) {
c.queue.Add(apiService)
}
}
func (c *AvailableConditionController) addEndpoints(obj interface{}) {
for _, apiService := range c.getAPIServicesFor(obj.(*v1.Endpoints)) {
c.queue.Add(apiService)
}
}
func (c *AvailableConditionController) updateEndpoints(obj, _ interface{}) {
for _, apiService := range c.getAPIServicesFor(obj.(*v1.Endpoints)) {
c.queue.Add(apiService)
}
}
func (c *AvailableConditionController) deleteEndpoints(obj interface{}) {
castObj, ok := obj.(*v1.Endpoints)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
klog.Errorf("Couldn't get object from tombstone %#v", obj)
return
}
castObj, ok = tombstone.Obj.(*v1.Endpoints)
if !ok {
klog.Errorf("Tombstone contained object that is not expected %#v", obj)
return
}
}
for _, apiService := range c.getAPIServicesFor(castObj) {
c.queue.Add(apiService)
}
}
// setUnavailableGauge set the metrics so that it reflect the current state base on availability of the given service
func (c *AvailableConditionController) setUnavailableGauge(newAPIService *apiregistrationv1.APIService) {
if apiregistrationv1apihelper.IsAPIServiceConditionTrue(newAPIService, apiregistrationv1.Available) {
c.metrics.SetAPIServiceAvailable(newAPIService.Name)
return
}
c.metrics.SetAPIServiceUnavailable(newAPIService.Name)
}
// setUnavailableCounter increases the metrics only if the given service is unavailable and its APIServiceCondition has changed
func (c *AvailableConditionController) setUnavailableCounter(originalAPIService, newAPIService *apiregistrationv1.APIService) {
wasAvailable := apiregistrationv1apihelper.IsAPIServiceConditionTrue(originalAPIService, apiregistrationv1.Available)
isAvailable := apiregistrationv1apihelper.IsAPIServiceConditionTrue(newAPIService, apiregistrationv1.Available)
statusChanged := isAvailable != wasAvailable
if statusChanged && !isAvailable {
reason := "UnknownReason"
if newCondition := apiregistrationv1apihelper.GetAPIServiceConditionByType(newAPIService, apiregistrationv1.Available); newCondition != nil {
reason = newCondition.Reason
}
c.metrics.UnavailableCounter(newAPIService.Name, reason).Inc()
}
}
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