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status.go
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status.go
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/*
Copyright 2015 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 status
import (
"context"
"fmt"
"net"
"sort"
"strings"
"time"
"github.com/pkg/errors"
"k8s.io/klog"
pool "gopkg.in/go-playground/pool.v3"
apiv1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/util/wait"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/kubernetes/pkg/kubelet/util/sliceutils"
"k8s.io/ingress-nginx/internal/ingress"
"k8s.io/ingress-nginx/internal/ingress/controller/store"
"k8s.io/ingress-nginx/internal/k8s"
"k8s.io/ingress-nginx/internal/task"
)
// UpdateInterval defines the time interval, in seconds, in
// which the status should check if an update is required.
var UpdateInterval = 60
// Syncer ...
type Syncer interface {
Run(chan struct{})
Shutdown()
}
type ingressLister interface {
// ListIngresses returns the list of Ingresses
ListIngresses(store.IngressFilterFunc) []*ingress.Ingress
}
// Config ...
type Config struct {
Client clientset.Interface
PublishService string
PublishStatusAddress string
UpdateStatusOnShutdown bool
UseNodeInternalIP bool
IngressLister ingressLister
}
// statusSync keeps the status IP in each Ingress rule updated executing a periodic check
// in all the defined rules. To simplify the process leader election is used so the update
// is executed only in one node (Ingress controllers can be scaled to more than one)
// If the controller is running with the flag --publish-service (with a valid service)
// the IP address behind the service is used, if it is running with the flag
// --publish-status-address, the address specified in the flag is used, if neither of the
// two flags are set, the source is the IP/s of the node/s
type statusSync struct {
Config
// pod contains runtime information about this pod
pod *k8s.PodInfo
// workqueue used to keep in sync the status IP/s
// in the Ingress rules
syncQueue *task.Queue
}
// Start starts the loop to keep the status in sync
func (s statusSync) Run(stopCh chan struct{}) {
go s.syncQueue.Run(time.Second, stopCh)
// trigger initial sync
s.syncQueue.EnqueueTask(task.GetDummyObject("sync status"))
// when this instance is the leader we need to enqueue
// an item to trigger the update of the Ingress status.
wait.PollUntil(time.Duration(UpdateInterval)*time.Second, func() (bool, error) {
s.syncQueue.EnqueueTask(task.GetDummyObject("sync status"))
return false, nil
}, stopCh)
}
// Shutdown stops the sync. In case the instance is the leader it will remove the current IP
// if there is no other instances running.
func (s statusSync) Shutdown() {
go s.syncQueue.Shutdown()
if !s.UpdateStatusOnShutdown {
klog.Warningf("skipping update of status of Ingress rules")
return
}
klog.Info("updating status of Ingress rules (remove)")
addrs, err := s.runningAddresses()
if err != nil {
klog.Errorf("error obtaining running IPs: %v", addrs)
return
}
if len(addrs) > 1 {
// leave the job to the next leader
klog.Infof("leaving status update for next leader (%v)", len(addrs))
return
}
if s.isRunningMultiplePods() {
klog.V(2).Infof("skipping Ingress status update (multiple pods running - another one will be elected as master)")
return
}
klog.Infof("removing address from ingress status (%v)", addrs)
s.updateStatus([]apiv1.LoadBalancerIngress{})
}
func (s *statusSync) sync(key interface{}) error {
if s.syncQueue.IsShuttingDown() {
klog.V(2).Infof("skipping Ingress status update (shutting down in progress)")
return nil
}
addrs, err := s.runningAddresses()
if err != nil {
return err
}
s.updateStatus(sliceToStatus(addrs))
return nil
}
func (s statusSync) keyfunc(input interface{}) (interface{}, error) {
return input, nil
}
// NewStatusSyncer returns a new Syncer instance
func NewStatusSyncer(podInfo *k8s.PodInfo, config Config) Syncer {
st := statusSync{
pod: podInfo,
Config: config,
}
st.syncQueue = task.NewCustomTaskQueue(st.sync, st.keyfunc)
return st
}
// runningAddresses returns a list of IP addresses and/or FQDN where the
// ingress controller is currently running
func (s *statusSync) runningAddresses() ([]string, error) {
if s.PublishStatusAddress != "" {
return []string{s.PublishStatusAddress}, nil
}
if s.PublishService != "" {
return statusAddressFromService(s.PublishService, s.Client)
}
// get information about all the pods running the ingress controller
pods, err := s.Client.CoreV1().Pods(s.pod.Namespace).List(context.TODO(), metav1.ListOptions{
LabelSelector: labels.SelectorFromSet(s.pod.Labels).String(),
})
if err != nil {
return nil, err
}
addrs := make([]string, 0)
for _, pod := range pods.Items {
// only Running pods are valid
if pod.Status.Phase != apiv1.PodRunning {
continue
}
name := k8s.GetNodeIPOrName(s.Client, pod.Spec.NodeName, s.UseNodeInternalIP)
if !sliceutils.StringInSlice(name, addrs) {
addrs = append(addrs, name)
}
}
return addrs, nil
}
func (s *statusSync) isRunningMultiplePods() bool {
pods, err := s.Client.CoreV1().Pods(s.pod.Namespace).List(context.TODO(), metav1.ListOptions{
LabelSelector: labels.SelectorFromSet(s.pod.Labels).String(),
})
if err != nil {
return false
}
return len(pods.Items) > 1
}
// sliceToStatus converts a slice of IP and/or hostnames to LoadBalancerIngress
func sliceToStatus(endpoints []string) []apiv1.LoadBalancerIngress {
lbi := []apiv1.LoadBalancerIngress{}
for _, ep := range endpoints {
if net.ParseIP(ep) == nil {
lbi = append(lbi, apiv1.LoadBalancerIngress{Hostname: ep})
} else {
lbi = append(lbi, apiv1.LoadBalancerIngress{IP: ep})
}
}
sort.SliceStable(lbi, func(a, b int) bool {
return lbi[a].IP < lbi[b].IP
})
return lbi
}
// updateStatus changes the status information of Ingress rules
func (s *statusSync) updateStatus(newIngressPoint []apiv1.LoadBalancerIngress) {
ings := s.IngressLister.ListIngresses(nil)
p := pool.NewLimited(10)
defer p.Close()
batch := p.Batch()
sort.SliceStable(newIngressPoint, lessLoadBalancerIngress(newIngressPoint))
for _, ing := range ings {
curIPs := ing.Status.LoadBalancer.Ingress
sort.SliceStable(curIPs, lessLoadBalancerIngress(curIPs))
if ingressSliceEqual(curIPs, newIngressPoint) {
klog.V(3).Infof("skipping update of Ingress %v/%v (no change)", ing.Namespace, ing.Name)
continue
}
batch.Queue(runUpdate(ing, newIngressPoint, s.Client))
}
batch.QueueComplete()
batch.WaitAll()
}
func runUpdate(ing *ingress.Ingress, status []apiv1.LoadBalancerIngress,
client clientset.Interface) pool.WorkFunc {
return func(wu pool.WorkUnit) (interface{}, error) {
if wu.IsCancelled() {
return nil, nil
}
if k8s.IsNetworkingIngressAvailable {
ingClient := client.NetworkingV1beta1().Ingresses(ing.Namespace)
currIng, err := ingClient.Get(context.TODO(), ing.Name, metav1.GetOptions{})
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("unexpected error searching Ingress %v/%v", ing.Namespace, ing.Name))
}
klog.Infof("updating Ingress %v/%v status from %v to %v", currIng.Namespace, currIng.Name, currIng.Status.LoadBalancer.Ingress, status)
currIng.Status.LoadBalancer.Ingress = status
_, err = ingClient.UpdateStatus(context.TODO(), currIng, metav1.UpdateOptions{})
if err != nil {
klog.Warningf("error updating ingress rule: %v", err)
}
} else {
ingClient := client.ExtensionsV1beta1().Ingresses(ing.Namespace)
currIng, err := ingClient.Get(context.TODO(), ing.Name, metav1.GetOptions{})
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("unexpected error searching Ingress %v/%v", ing.Namespace, ing.Name))
}
klog.Infof("updating Ingress %v/%v status from %v to %v", currIng.Namespace, currIng.Name, currIng.Status.LoadBalancer.Ingress, status)
currIng.Status.LoadBalancer.Ingress = status
_, err = ingClient.UpdateStatus(context.TODO(), currIng, metav1.UpdateOptions{})
if err != nil {
klog.Warningf("error updating ingress rule: %v", err)
}
}
return true, nil
}
}
func lessLoadBalancerIngress(addrs []apiv1.LoadBalancerIngress) func(int, int) bool {
return func(a, b int) bool {
switch strings.Compare(addrs[a].Hostname, addrs[b].Hostname) {
case -1:
return true
case 1:
return false
}
return addrs[a].IP < addrs[b].IP
}
}
func ingressSliceEqual(lhs, rhs []apiv1.LoadBalancerIngress) bool {
if len(lhs) != len(rhs) {
return false
}
for i := range lhs {
if lhs[i].IP != rhs[i].IP {
return false
}
if lhs[i].Hostname != rhs[i].Hostname {
return false
}
}
return true
}
func statusAddressFromService(service string, kubeClient clientset.Interface) ([]string, error) {
ns, name, _ := k8s.ParseNameNS(service)
svc, err := kubeClient.CoreV1().Services(ns).Get(context.TODO(), name, metav1.GetOptions{})
if err != nil {
return nil, err
}
switch svc.Spec.Type {
case apiv1.ServiceTypeExternalName:
return []string{svc.Spec.ExternalName}, nil
case apiv1.ServiceTypeClusterIP:
return []string{svc.Spec.ClusterIP}, nil
case apiv1.ServiceTypeNodePort:
addresses := []string{}
if svc.Spec.ExternalIPs != nil {
addresses = append(addresses, svc.Spec.ExternalIPs...)
} else {
addresses = append(addresses, svc.Spec.ClusterIP)
}
return addresses, nil
case apiv1.ServiceTypeLoadBalancer:
addresses := []string{}
for _, ip := range svc.Status.LoadBalancer.Ingress {
if ip.IP == "" {
addresses = append(addresses, ip.Hostname)
} else {
addresses = append(addresses, ip.IP)
}
}
addresses = append(addresses, svc.Spec.ExternalIPs...)
return addresses, nil
}
return nil, fmt.Errorf("unable to extract IP address/es from service %v", service)
}