/
service.go
197 lines (177 loc) · 5.75 KB
/
service.go
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package appstate
import (
"context"
"time"
"github.com/replicatedhq/replicated-sdk/pkg/appstate/types"
corev1 "k8s.io/api/core/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 (
ServiceResourceKind = "service"
)
func init() {
registerResourceKindNames(ServiceResourceKind, "services", "svc")
}
func runServiceController(
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.CoreV1().Services(targetNamespace).List(context.TODO(), options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return clientset.CoreV1().Services(targetNamespace).Watch(context.TODO(), options)
},
}
informer := cache.NewSharedInformer(
listwatch,
&corev1.Service{},
// NOTE: services rely on endpoint status as well so unless we add additional
// informers, we have to resync more frequently.
10*time.Second,
)
eventHandler := NewServiceEventHandler(
clientset,
filterStatusInformersByResourceKind(informers, ServiceResourceKind),
resourceStateCh,
)
runInformer(ctx, informer, eventHandler)
return
}
type serviceEventHandler struct {
clientset kubernetes.Interface
informers []types.StatusInformer
resourceStateCh chan<- types.ResourceState
}
func NewServiceEventHandler(clientset kubernetes.Interface, informers []types.StatusInformer, resourceStateCh chan<- types.ResourceState) *serviceEventHandler {
return &serviceEventHandler{
clientset: clientset,
informers: informers,
resourceStateCh: resourceStateCh,
}
}
func (h *serviceEventHandler) ObjectCreated(obj interface{}) {
r := h.cast(obj)
if _, ok := h.getInformer(r); !ok {
return
}
h.resourceStateCh <- makeServiceResourceState(r, CalculateServiceState(h.clientset, r))
}
func (h *serviceEventHandler) ObjectUpdated(obj interface{}) {
r := h.cast(obj)
if _, ok := h.getInformer(r); !ok {
return
}
h.resourceStateCh <- makeServiceResourceState(r, CalculateServiceState(h.clientset, r))
}
func (h *serviceEventHandler) ObjectDeleted(obj interface{}) {
r := h.cast(obj)
if _, ok := h.getInformer(r); !ok {
return
}
h.resourceStateCh <- makeServiceResourceState(r, types.StateMissing)
}
func (h *serviceEventHandler) cast(obj interface{}) *corev1.Service {
r, _ := obj.(*corev1.Service)
return r
}
func (h *serviceEventHandler) getInformer(r *corev1.Service) (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 makeServiceResourceState(r *corev1.Service, state types.State) types.ResourceState {
return types.ResourceState{
Kind: ServiceResourceKind,
Name: r.Name,
Namespace: r.Namespace,
State: state,
}
}
func CalculateServiceState(clientset kubernetes.Interface, r *corev1.Service) types.State {
var states []types.State
// https://github.com/kubernetes/kubectl/blob/6b77b0790ab40d2a692ad80e9e4c962e784bb9b8/pkg/describe/versioned/describe.go#L4617
states = append(states, serviceGetStateFromEndpoints(clientset, r))
// https://github.com/kubernetes/kubernetes/blob/badcd4af3f592376ce891b7c1b7a43ed6a18a348/pkg/printers/internalversion/printers.go#L1003
states = append(states, serviceGetStateFromExternalIP(r))
return types.MinState(states...)
}
func serviceGetStateFromEndpoints(clientset kubernetes.Interface, svc *corev1.Service) (minState types.State) {
endpoints, _ := clientset.CoreV1().Endpoints(svc.Namespace).Get(context.TODO(), svc.Name, metav1.GetOptions{})
if endpoints == nil {
// I'm unsure of the state for this case
return types.StateUnavailable
}
for i := range svc.Spec.Ports {
sp := &svc.Spec.Ports[i]
minState = types.MinState(minState, servicePortGetStateFromEndpoints(endpoints, sets.NewString(sp.Name)))
}
return
}
func servicePortGetStateFromEndpoints(endpoints *corev1.Endpoints, ports sets.String) (minState types.State) {
if len(endpoints.Subsets) == 0 {
// I'm unsure of the state for this case
return types.StateUnavailable
}
for i := range endpoints.Subsets {
ss := &endpoints.Subsets[i]
if len(ss.Ports) == 0 {
// It's possible to have headless services with no ports.
if len(ss.NotReadyAddresses) > 0 {
minState = types.MinState(minState, types.StateDegraded)
}
// What else can we infer here?
} else {
// "Normal" services with ports defined.
for i := range ss.Ports {
port := &ss.Ports[i]
if ports.Has(port.Name) {
if len(ss.Addresses) == 0 {
minState = types.MinState(minState, types.StateUnavailable)
} else if len(ss.NotReadyAddresses) > 0 {
minState = types.MinState(minState, types.StateDegraded)
} else {
minState = types.MinState(minState, types.StateReady)
}
}
}
}
}
return
}
func serviceGetStateFromExternalIP(svc *corev1.Service) types.State {
if svc.Spec.Type != corev1.ServiceTypeLoadBalancer {
return types.StateReady
}
if len(svc.Spec.ExternalIPs) > 0 {
return types.StateReady
}
lbIps := loadBalancerStatusIPs(svc.Status.LoadBalancer)
if len(lbIps) > 0 {
return types.StateReady
}
return types.StateUnavailable
}
func loadBalancerStatusIPs(s corev1.LoadBalancerStatus) 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
}