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ingress.go
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ingress.go
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package appstate
import (
"context"
"time"
"github.com/replicatedhq/kots/pkg/appstate/types"
"github.com/replicatedhq/kots/pkg/k8sutil"
"github.com/replicatedhq/kots/pkg/logger"
networkingv1 "k8s.io/api/networking/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
)
const (
IngressResourceKind = "ingress"
)
func init() {
registerResourceKindNames(IngressResourceKind, "ingresses", "ing")
}
func runIngressController(
ctx context.Context, clientset kubernetes.Interface, targetNamespace string,
informers []types.StatusInformer, resourceStateCh chan<- types.ResourceState,
) {
listwatch := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return clientset.NetworkingV1().Ingresses(targetNamespace).List(context.TODO(), options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return clientset.NetworkingV1().Ingresses(targetNamespace).Watch(context.TODO(), options)
},
}
informer := cache.NewSharedInformer(
listwatch,
&networkingv1.Ingress{},
// NOTE: ingresses rely on endpoint and service status as well so unless we add
// additional informers, we have to resync more frequently.
10*time.Second,
)
eventHandler := NewIngressEventHandler(
clientset,
filterStatusInformersByResourceKind(informers, IngressResourceKind),
resourceStateCh,
)
runInformer(ctx, informer, eventHandler)
return
}
type ingressEventHandler struct {
clientset kubernetes.Interface
informers []types.StatusInformer
resourceStateCh chan<- types.ResourceState
}
func NewIngressEventHandler(clientset kubernetes.Interface, informers []types.StatusInformer, resourceStateCh chan<- types.ResourceState) *ingressEventHandler {
return &ingressEventHandler{
clientset: clientset,
informers: informers,
resourceStateCh: resourceStateCh,
}
}
func (h *ingressEventHandler) ObjectCreated(obj interface{}) {
r := h.cast(obj)
if _, ok := h.getInformer(r); !ok {
return
}
h.resourceStateCh <- makeIngressResourceState(r, CalculateIngressState(h.clientset, r))
}
func (h *ingressEventHandler) ObjectUpdated(obj interface{}) {
r := h.cast(obj)
if _, ok := h.getInformer(r); !ok {
return
}
h.resourceStateCh <- makeIngressResourceState(r, CalculateIngressState(h.clientset, r))
}
func (h *ingressEventHandler) ObjectDeleted(obj interface{}) {
r := h.cast(obj)
if _, ok := h.getInformer(r); !ok {
return
}
h.resourceStateCh <- makeIngressResourceState(r, types.StateMissing)
}
func (h *ingressEventHandler) cast(obj interface{}) *networkingv1.Ingress {
r, _ := obj.(*networkingv1.Ingress)
return r
}
func (h *ingressEventHandler) getInformer(r *networkingv1.Ingress) (types.StatusInformer, bool) {
if r != nil {
for _, informer := range h.informers {
if r.Namespace == informer.Namespace && r.Name == informer.Name {
return informer, true
}
}
}
return types.StatusInformer{}, false
}
func makeIngressResourceState(r *networkingv1.Ingress, state types.State) types.ResourceState {
return types.ResourceState{
Kind: IngressResourceKind,
Name: r.Name,
Namespace: r.Namespace,
State: state,
}
}
func CalculateIngressState(clientset kubernetes.Interface, r *networkingv1.Ingress) types.State {
ns := r.Namespace
backend := r.Spec.DefaultBackend
k8sMinorVersion, err := k8sutil.GetK8sMinorVersion(clientset)
if err != nil {
logger.Errorf("failed to get k8s minor version: %v", err)
} else if k8sMinorVersion < 22 && backend == nil {
// https://github.com/kubernetes/kubectl/blob/6b77b0790ab40d2a692ad80e9e4c962e784bb9b8/pkg/describe/versioned/describe.go#L2367
// Ingresses that don't specify a default backend inherit the default backend in the kube-system namespace.
// This behavior is applicable to Kubernetes versions prior to 1.22 (i.e. Ingress versions before networking.k8s.io/v1).
backend = &networkingv1.IngressBackend{
Service: &networkingv1.IngressServiceBackend{
Name: "default-http-backend",
Port: networkingv1.ServiceBackendPort{
Number: 80,
},
},
}
ns = metav1.NamespaceSystem
}
var states []types.State
if backend != nil {
states = append(states, ingressGetStateFromBackend(clientset, ns, *backend))
}
for _, rules := range r.Spec.Rules {
for _, path := range rules.HTTP.Paths {
states = append(states, ingressGetStateFromBackend(clientset, r.Namespace, path.Backend))
}
}
// https://github.com/kubernetes/kubernetes/blob/badcd4af3f592376ce891b7c1b7a43ed6a18a348/pkg/printers/internalversion/printers.go#L1067
states = append(states, ingressGetStateFromExternalIP(r))
return types.MinState(states...)
}
func ingressGetStateFromBackend(clientset kubernetes.Interface, namespace string, backend networkingv1.IngressBackend) (minState types.State) {
if backend.Service == nil {
return types.StateUnavailable
}
service, _ := clientset.CoreV1().Services(namespace).Get(context.TODO(), backend.Service.Name, metav1.GetOptions{})
if service == nil {
return types.StateUnavailable
}
return serviceGetStateFromEndpoints(clientset, service)
}
func ingressGetStateFromExternalIP(ing *networkingv1.Ingress) types.State {
lbIps := ingressLoadBalancerStatusIPs(ing.Status.LoadBalancer)
if len(lbIps) > 0 {
return types.StateReady
}
return types.StateUnavailable
}
func ingressLoadBalancerStatusIPs(s networkingv1.IngressLoadBalancerStatus) sets.String {
ingress := s.Ingress
result := sets.NewString()
for i := range ingress {
if ingress[i].IP != "" {
result.Insert(ingress[i].IP)
} else if ingress[i].Hostname != "" {
result.Insert(ingress[i].Hostname)
}
}
return result
}