generated from oracle/template-repo
/
nodeBackend.go
359 lines (302 loc) · 10.9 KB
/
nodeBackend.go
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package nodeBackend
import (
"context"
"fmt"
"time"
"github.com/oracle/oci-native-ingress-controller/pkg/client"
"github.com/oracle/oci-native-ingress-controller/pkg/controllers/ingressclass"
"k8s.io/klog/v2"
ociloadbalancer "github.com/oracle/oci-go-sdk/v65/loadbalancer"
corev1 "k8s.io/api/core/v1"
networkingv1 "k8s.io/api/networking/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
networkinginformers "k8s.io/client-go/informers/networking/v1"
corelisters "k8s.io/client-go/listers/core/v1"
networkinglisters "k8s.io/client-go/listers/networking/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"github.com/oracle/oci-native-ingress-controller/pkg/util"
)
const (
// ToBeDeletedTaint is a taint used by the CLuster Autoscaler before marking a node for deletion. Defined in
// https://github.com/kubernetes/autoscaler/blob/e80ab518340f88f364fe3ef063f8303755125971/cluster-autoscaler/utils/deletetaint/delete.go#L36
ToBeDeletedTaint = "ToBeDeletedByClusterAutoscaler"
)
type Controller struct {
controllerClass string
ingressClassLister networkinglisters.IngressClassLister
ingressLister networkinglisters.IngressLister
serviceLister corelisters.ServiceLister
podLister corelisters.PodLister
nodeLister corelisters.NodeLister
endpointLister corelisters.EndpointsLister
queue workqueue.RateLimitingInterface
client *client.ClientProvider
}
func NewController(controllerClass string, ingressClassInformer networkinginformers.IngressClassInformer, ingressInformer networkinginformers.IngressInformer, serviceLister corelisters.ServiceLister, endpointLister corelisters.EndpointsLister, podLister corelisters.PodLister, nodeLister corelisters.NodeLister,
client *client.ClientProvider) *Controller {
c := &Controller{
controllerClass: controllerClass,
ingressClassLister: ingressClassInformer.Lister(),
ingressLister: ingressInformer.Lister(),
serviceLister: serviceLister,
endpointLister: endpointLister,
podLister: podLister,
nodeLister: nodeLister,
client: client,
queue: workqueue.NewRateLimitingQueue(workqueue.NewItemExponentialFailureRateLimiter(10*time.Second, 5*time.Minute)),
}
return c
}
func (c *Controller) processNextItem() bool {
// Wait until there is a new item in the working queue
key, quit := c.queue.Get()
if quit {
return false
}
// Tell the queue that we are done with processing this key. This unblocks the key for other workers
// This allows safe parallel processing because two pods with the same key are never processed in
// parallel.
defer c.queue.Done(key)
// Invoke the method containing the business logic
err := c.sync(key.(string))
// Handle the error if something went wrong during the execution of the business logic
util.HandleErr(c.queue, err, "Error syncing backends for ingress class", key)
return true
}
// sync is the business logic of the controller.
func (c *Controller) sync(key string) error {
_, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
klog.ErrorS(err, "Failed to split meta namespace cache key", "cacheKey", key)
return err
}
startTime := time.Now()
klog.V(4).InfoS("Started syncing backends for ingress class", "ingressClass", klog.KRef("", name), "startTime", startTime)
defer func() {
klog.V(4).InfoS("Finished syncing backends for ingress class", "ingressClass", klog.KRef("", name), "duration", time.Since(startTime))
}()
ingressClass, err := c.ingressClassLister.Get(name)
if apierrors.IsNotFound(err) {
klog.V(2).InfoS("ingress class is not found or has been deleted", "ingressClass", klog.KRef("", name))
return nil
}
if err != nil {
return err
}
if ingressClass.Spec.Controller != c.controllerClass {
klog.V(4).InfoS("skipping ingress class, not for this controller", "ingressClass", klog.KObj(ingressClass))
return nil
}
lbID := util.GetIngressClassLoadBalancerId(ingressClass)
if lbID == "" {
// Still waiting on the ingress class controller to provision the load balancer.
return util.ErrIngressClassNotReady
}
err = c.ensureBackends(ingressClass, lbID)
if err != nil {
return err
}
return nil
}
func getNodeConditionPredicate() NodeConditionPredicate {
return func(node *corev1.Node) bool {
// Remove nodes that are about to be deleted by the cluster autoscaler.
for _, taint := range node.Spec.Taints {
if taint.Key == ToBeDeletedTaint {
return false
}
}
// If we have no info, don't accept
if len(node.Status.Conditions) == 0 {
return false
}
for _, cond := range node.Status.Conditions {
// We consider the node for load balancing only when its NodeReady condition status
// is ConditionTrue
if cond.Type == corev1.NodeReady && cond.Status != corev1.ConditionTrue {
return false
}
}
return true
}
}
func (c *Controller) ensureBackends(ingressClass *networkingv1.IngressClass, lbID string) error {
ingresses, err := util.GetIngressesForClass(c.ingressLister, ingressClass)
if err != nil {
return err
}
nodes, err := filterNodes(c.nodeLister)
if err != nil {
return err
}
// If there are no available nodes.
if len(nodes) == 0 {
return fmt.Errorf("error: %s due to : %s", "UnAvailableNodes", "There are no available provisioned nodes")
}
for _, ingress := range ingresses {
for _, rule := range ingress.Spec.Rules {
for _, path := range rule.HTTP.Paths {
svcName, svcPort, _, svc, err := util.PathToServiceAndTargetPort(c.serviceLister, ingress.Namespace, path)
if err != nil {
return err
}
if svc == nil || svc.Spec.Ports == nil || svc.Spec.Ports[0].NodePort == 0 {
continue
}
var backends []ociloadbalancer.BackendDetails
nodePort := svc.Spec.Ports[0].NodePort
trafficPolicy := svc.Spec.ExternalTrafficPolicy
if trafficPolicy == corev1.ServiceExternalTrafficPolicyTypeCluster {
for _, node := range nodes {
backends = append(backends, util.NewBackend(NodeInternalIP(node), nodePort))
}
} else {
backends, err = getBackendsFromPods(c.endpointLister, c.podLister, c.nodeLister, ingress.Namespace, svcName, backends, nodePort)
if err != nil {
return err
}
}
backendSetName := util.GenerateBackendSetName(ingress.Namespace, svcName, svcPort)
err = c.client.GetLbClient().UpdateBackends(context.TODO(), lbID, backendSetName, backends)
if err != nil {
return fmt.Errorf("unable to update backends for %s/%s: %w", ingressClass.Name, backendSetName, err)
}
}
}
}
// Sync default backends
c.syncDefaultBackend(lbID, ingresses)
return nil
}
func getBackendsFromPods(endpointLister corelisters.EndpointsLister, podLister corelisters.PodLister, nodeLister corelisters.NodeLister, namespace string, svcName string, backends []ociloadbalancer.BackendDetails, nodePort int32) ([]ociloadbalancer.BackendDetails, error) {
pods, err := util.RetrievePods(endpointLister, podLister, namespace, svcName)
if err != nil {
return nil, err
}
for _, pod := range pods {
node, err := nodeLister.Get(pod.Spec.NodeName)
if err != nil {
if apierrors.IsNotFound(err) {
klog.Infof("node %s has been deleted, skipping pod", pod.Spec.NodeName)
continue
}
return nil, err
}
backends = append(backends, util.NewBackend(NodeInternalIP(node), nodePort))
}
return backends, nil
}
func NodeInternalIP(node *corev1.Node) string {
for _, addr := range node.Status.Addresses {
if addr.Type == corev1.NodeInternalIP {
return addr.Address
}
}
return ""
}
// NodeConditionPredicate is a function that indicates whether the given node's conditions meet
// some set of criteria defined by the function.
type NodeConditionPredicate func(node *corev1.Node) bool
// filterNodes gets nodes that matches predicate function.
func filterNodes(nodeLister corelisters.NodeLister) ([]*corev1.Node, error) {
nodes, err := nodeLister.List(labels.Everything())
if err != nil {
return nil, err
}
var filtered []*corev1.Node
predicate := getNodeConditionPredicate()
for i := range nodes {
if predicate(nodes[i]) {
filtered = append(filtered, nodes[i])
}
}
return filtered, nil
}
func (c *Controller) syncDefaultBackend(lbID string, ingresses []*networkingv1.Ingress) error {
klog.V(4).InfoS("Syncing default backend")
// if no backend then update
backends, err := c.getDefaultBackends(ingresses)
if err != nil {
klog.ErrorS(err, "Error processing default backend sync")
return nil
}
err = c.client.GetLbClient().UpdateBackends(context.TODO(), lbID, ingressclass.DefaultIngress, backends)
if err != nil {
return err
}
return nil
}
func (c *Controller) getDefaultBackends(ingresses []*networkingv1.Ingress) ([]ociloadbalancer.BackendDetails, error) {
klog.V(4).InfoS("Retrieve default backends")
var backend *networkingv1.IngressBackend
var namespace = ""
backends := []ociloadbalancer.BackendDetails{}
for _, ingress := range ingresses {
if ingress.Spec.DefaultBackend != nil {
if backend != nil && backend != ingress.Spec.DefaultBackend {
return nil, fmt.Errorf("conflict in default backend resource, only one is permitted")
}
backend = ingress.Spec.DefaultBackend
namespace = ingress.Namespace
}
}
if backend == nil {
klog.V(4).InfoS("No default backend set for any ingress")
return backends, nil
}
if backend.Service == nil {
klog.V(4).InfoS("No service set for default backend on any ingress")
return backends, nil
}
svcName := backend.Service.Name
svc, err := c.serviceLister.Services(namespace).Get(svcName)
if err != nil {
klog.Errorf("Default backend service not found for service : %s", svcName)
return nil, err
}
if svc.Spec.Ports[0].NodePort == 0 {
return nil, fmt.Errorf("Node port not found for service : %s", svcName)
}
nodePort := svc.Spec.Ports[0].NodePort
backends, err = getBackendsFromPods(c.endpointLister, c.podLister, c.nodeLister, namespace, svcName, backends, nodePort)
if err != nil {
return nil, err
}
return backends, err
}
// Run begins watching and syncing.
func (c *Controller) Run(workers int, stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
// Let the workers stop when we are done
defer c.queue.ShutDown()
klog.Info("Starting Backend controller")
for i := 0; i < workers; i++ {
go wait.Until(c.runWorker, time.Second, stopCh)
}
go wait.Until(c.runPusher, 10*time.Second, stopCh)
<-stopCh
klog.Info("Stopping Backend controller")
}
func (c *Controller) runPusher() {
ingressClasses, err := c.ingressClassLister.List(labels.Everything())
if err != nil {
klog.Errorf("unable to list ingress classes for syncing backends: %v", err)
return
}
for _, ic := range ingressClasses {
key, err := cache.MetaNamespaceKeyFunc(ic)
if err != nil {
utilruntime.HandleError(fmt.Errorf("couldn't get key for object %#v: %v", ic, err))
return
}
c.queue.Add(key)
}
}
func (c *Controller) runWorker() {
for c.processNextItem() {
}
}