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ingress.go
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ingress.go
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package ingress
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/rancher/norman/types/convert"
util "github.com/rancher/rancher/pkg/controllers/user/workload"
"github.com/rancher/types/apis/core/v1"
"github.com/rancher/types/config"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
"k8s.io/api/extensions/v1beta1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
)
//TODO fix the workload services cleanup
// This controller is responsible for monitoring ingress and
// creating services for them if the service is missing
// Creation would only happen if the service reference was put by Rancher API based on
// ingress.backend.workloadId. This information is stored in state field in the annotation
type Controller struct {
serviceLister v1.ServiceLister
services v1.ServiceInterface
}
func Register(ctx context.Context, workload *config.UserOnlyContext) {
c := &Controller{
services: workload.Core.Services(""),
serviceLister: workload.Core.Services("").Controller().Lister(),
}
workload.Extensions.Ingresses("").AddHandler("ingressWorkloadController", c.sync)
}
func (c *Controller) sync(key string, obj *v1beta1.Ingress) error {
if obj == nil || obj.DeletionTimestamp != nil {
return nil
}
state := getIngressState(obj)
if state == nil {
return nil
}
serviceToPort := make(map[string]string)
serviceToKey := make(map[string]string)
for _, r := range obj.Spec.Rules {
host := r.Host
for _, b := range r.HTTP.Paths {
path := b.Path
port := b.Backend.ServicePort.IntVal
key := getStateKey(host, path, convert.ToString(port))
if _, ok := state[key]; ok {
serviceToKey[b.Backend.ServiceName] = key
serviceToPort[b.Backend.ServiceName] = convert.ToString(port)
}
}
}
if obj.Spec.Backend != nil {
serviceName := obj.Spec.Backend.ServiceName
portStr := convert.ToString(obj.Spec.Backend.ServicePort.IntVal)
key := getStateKey("", "", portStr)
if _, ok := state[key]; ok {
serviceToKey[serviceName] = key
serviceToPort[serviceName] = portStr
}
}
for serviceName, portStr := range serviceToPort {
workloadIDsStr := state[serviceToKey[serviceName]]
b, err := json.Marshal(strings.Split(workloadIDsStr, "/"))
if err != nil {
return err
}
workloadIDs := string(b)
existing, err := c.serviceLister.Get(obj.Namespace, serviceName)
if err != nil && !apierrors.IsNotFound(err) {
return err
}
if existing == nil {
controller := true
ownerRef := metav1.OwnerReference{
Name: serviceName,
APIVersion: "v1beta1/extensions",
UID: obj.UID,
Kind: "Ingress",
Controller: &controller,
}
port, err := strconv.ParseInt(portStr, 10, 64)
if err != nil {
return err
}
servicePorts := []corev1.ServicePort{
{
Port: int32(port),
TargetPort: intstr.Parse(portStr),
Protocol: "TCP",
},
}
annotations := make(map[string]string)
annotations[util.WorkloadAnnotation] = workloadIDs
service := &corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: serviceName,
OwnerReferences: []metav1.OwnerReference{ownerRef},
Namespace: obj.Namespace,
Annotations: annotations,
},
Spec: corev1.ServiceSpec{
ClusterIP: "None",
Type: "ClusterIP",
Ports: servicePorts,
},
}
logrus.Infof("Creating headless service %s for ingress %s, port %s", serviceName, key, portStr)
if _, err := c.services.Create(service); err != nil {
return err
}
} else {
ingressManaged := false
for _, o := range existing.OwnerReferences {
if o.UID == obj.UID {
ingressManaged = true
break
}
}
if ingressManaged {
// TODO - fix so the update is done only when workload ids are changed
toUpdate := existing.DeepCopy()
if toUpdate.Annotations == nil {
toUpdate.Annotations = map[string]string{}
}
toUpdate.Annotations[util.WorkloadAnnotation] = workloadIDs
if _, err := c.services.Update(toUpdate); err != nil {
return err
}
}
}
}
return nil
}
func getStateKey(host string, path string, port string) string {
key := fmt.Sprintf("%s/%s/%s", host, path, port)
return base64.URLEncoding.EncodeToString([]byte(key))
}
func getIngressState(obj *v1beta1.Ingress) map[string]string {
annotations := obj.Annotations
if annotations == nil {
return nil
}
if v, ok := annotations["ingress.cattle.io/state"]; ok {
state := make(map[string]string)
json.Unmarshal([]byte(convert.ToString(v)), &state)
return state
}
return nil
}