/
ingress.go
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/
ingress.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 ingress
import (
"context"
"fmt"
"time"
"go.uber.org/zap"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"github.com/apache/apisix-ingress-controller/pkg/kube"
"github.com/apache/apisix-ingress-controller/pkg/log"
"github.com/apache/apisix-ingress-controller/pkg/types"
)
const (
_ingressKey = "kubernetes.io/ingress.class"
)
type ingressController struct {
controller *Controller
workqueue workqueue.RateLimitingInterface
workers int
}
func (c *Controller) newIngressController() *ingressController {
ctl := &ingressController{
controller: c,
workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.NewItemFastSlowRateLimiter(1*time.Second, 60*time.Second, 5), "ingress"),
workers: 1,
}
c.ingressInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ctl.onAdd,
UpdateFunc: ctl.onUpdate,
DeleteFunc: ctl.OnDelete,
})
return ctl
}
func (c *ingressController) run(ctx context.Context) {
log.Info("ingress controller started")
defer log.Infof("ingress controller exited")
defer c.workqueue.ShutDown()
if !cache.WaitForCacheSync(ctx.Done(), c.controller.ingressInformer.HasSynced) {
log.Errorf("cache sync failed")
return
}
for i := 0; i < c.workers; i++ {
go c.runWorker(ctx)
}
<-ctx.Done()
}
func (c *ingressController) runWorker(ctx context.Context) {
for {
obj, quit := c.workqueue.Get()
if quit {
return
}
err := c.sync(ctx, obj.(*types.Event))
c.workqueue.Done(obj)
c.handleSyncErr(obj, err)
}
}
func (c *ingressController) sync(ctx context.Context, ev *types.Event) error {
ingEv := ev.Object.(kube.IngressEvent)
namespace, name, err := cache.SplitMetaNamespaceKey(ingEv.Key)
if err != nil {
log.Errorf("found ingress resource with invalid meta namespace key %s: %s", ingEv.Key, err)
return err
}
var ing kube.Ingress
switch ingEv.GroupVersion {
case kube.IngressV1:
ing, err = c.controller.ingressLister.V1(namespace, name)
case kube.IngressV1beta1:
ing, err = c.controller.ingressLister.V1beta1(namespace, name)
case kube.IngressExtensionsV1beta1:
ing, err = c.controller.ingressLister.ExtensionsV1beta1(namespace, name)
default:
err = fmt.Errorf("unsupported group version %s, one of (%s/%s/%s) is expected", ingEv.GroupVersion,
kube.IngressV1, kube.IngressV1beta1, kube.IngressExtensionsV1beta1)
}
if err != nil {
if !k8serrors.IsNotFound(err) {
log.Errorf("failed to get ingress %s (group version: %s): %s", ingEv.Key, ingEv.GroupVersion, err)
return err
}
if ev.Type != types.EventDelete {
log.Warnf("ingress %s (group version: %s) was deleted before it can be delivered", ingEv.Key, ingEv.GroupVersion)
// Don't need to retry.
return nil
}
}
if ev.Type == types.EventDelete {
if ing != nil {
// We still find the resource while we are processing the DELETE event,
// that means object with same namespace and name was created, discarding
// this stale DELETE event.
log.Warnf("discard the stale ingress delete event since the %s exists", ingEv.Key)
return nil
}
ing = ev.Tombstone.(kube.Ingress)
}
tctx, err := c.controller.translator.TranslateIngress(ing)
if err != nil {
log.Errorw("failed to translate ingress",
zap.Error(err),
zap.Any("ingress", ing),
)
return err
}
log.Debugw("translated ingress resource to a couple of routes and upstreams",
zap.Any("ingress", ing),
zap.Any("routes", tctx.Routes),
zap.Any("upstreams", tctx.Upstreams),
zap.Any("ssl", tctx.SSL),
)
m := &manifest{
ssl: tctx.SSL,
routes: tctx.Routes,
upstreams: tctx.Upstreams,
}
var (
added *manifest
updated *manifest
deleted *manifest
)
if ev.Type == types.EventDelete {
deleted = m
} else if ev.Type == types.EventAdd {
added = m
} else {
oldCtx, err := c.controller.translator.TranslateIngress(ingEv.OldObject)
if err != nil {
log.Errorw("failed to translate ingress",
zap.String("event", "update"),
zap.Error(err),
zap.Any("ingress", ingEv.OldObject),
)
return err
}
om := &manifest{
routes: oldCtx.Routes,
upstreams: oldCtx.Upstreams,
ssl: oldCtx.SSL,
}
added, updated, deleted = m.diff(om)
}
if err := c.controller.syncManifests(ctx, added, updated, deleted); err != nil {
log.Errorw("failed to sync ingress artifacts",
zap.Error(err),
)
return err
}
return nil
}
func (c *ingressController) handleSyncErr(obj interface{}, err error) {
if err == nil {
c.workqueue.Forget(obj)
c.controller.MetricsCollector.IncrSyncOperation("ingress", "success")
return
}
log.Warnw("sync ingress failed, will retry",
zap.Any("object", obj),
zap.Error(err),
)
c.workqueue.AddRateLimited(obj)
c.controller.MetricsCollector.IncrSyncOperation("ingress", "failure")
}
func (c *ingressController) onAdd(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
log.Errorf("found ingress resource with bad meta namespace key: %s", err)
return
}
if !c.controller.namespaceWatching(key) {
return
}
ing := kube.MustNewIngress(obj)
valid := c.isIngressEffective(ing)
if valid {
log.Debugw("ingress add event arrived",
zap.Any("object", ing),
)
} else {
log.Debugw("ignore noneffective ingress add event",
zap.Any("object", ing),
)
return
}
c.workqueue.Add(&types.Event{
Type: types.EventAdd,
Object: kube.IngressEvent{
Key: key,
GroupVersion: ing.GroupVersion(),
},
})
c.controller.MetricsCollector.IncrEvents("ingress", "add")
}
func (c *ingressController) onUpdate(oldObj, newObj interface{}) {
prev := kube.MustNewIngress(oldObj)
curr := kube.MustNewIngress(newObj)
if prev.ResourceVersion() >= curr.ResourceVersion() {
return
}
key, err := cache.MetaNamespaceKeyFunc(newObj)
if err != nil {
log.Errorf("found ingress resource with bad meta namespace key: %s", err)
return
}
valid := c.isIngressEffective(curr)
if valid {
log.Debugw("ingress update event arrived",
zap.Any("new object", oldObj),
zap.Any("old object", newObj),
)
} else {
log.Debugw("ignore noneffective ingress update event",
zap.Any("new object", oldObj),
zap.Any("old object", newObj),
)
return
}
c.workqueue.Add(&types.Event{
Type: types.EventUpdate,
Object: kube.IngressEvent{
Key: key,
GroupVersion: curr.GroupVersion(),
OldObject: prev,
},
})
c.controller.MetricsCollector.IncrEvents("ingress", "update")
}
func (c *ingressController) OnDelete(obj interface{}) {
ing, err := kube.NewIngress(obj)
if err != nil {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
return
}
ing = kube.MustNewIngress(tombstone)
}
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
log.Errorf("found ingress resource with bad meta namespace key: %s", err)
return
}
if !c.controller.namespaceWatching(key) {
return
}
valid := c.isIngressEffective(ing)
if valid {
log.Debugw("ingress delete event arrived",
zap.Any("final state", ing),
)
} else {
log.Debugw("ignore noneffective ingress delete event",
zap.Any("object", ing),
)
return
}
c.workqueue.Add(&types.Event{
Type: types.EventDelete,
Object: kube.IngressEvent{
Key: key,
GroupVersion: ing.GroupVersion(),
},
Tombstone: ing,
})
c.controller.MetricsCollector.IncrEvents("ingress", "delete")
}
func (c *ingressController) isIngressEffective(ing kube.Ingress) bool {
var (
ic *string
ica string
)
if ing.GroupVersion() == kube.IngressV1 {
ic = ing.V1().Spec.IngressClassName
ica = ing.V1().GetAnnotations()[_ingressKey]
} else if ing.GroupVersion() == kube.IngressV1beta1 {
ic = ing.V1beta1().Spec.IngressClassName
ica = ing.V1beta1().GetAnnotations()[_ingressKey]
} else {
ic = ing.ExtensionsV1beta1().Spec.IngressClassName
ica = ing.ExtensionsV1beta1().GetAnnotations()[_ingressKey]
}
// kubernetes.io/ingress.class takes the precedence.
if ica != "" {
return ica == c.controller.cfg.Kubernetes.IngressClass
}
if ic != nil {
return *ic == c.controller.cfg.Kubernetes.IngressClass
}
return false
}