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support for zone transfer for kubernetes (#1259)

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* plugin/kubernetes: axfr

Hook up dynamic SOA serial by setting ResourceEventHandlerFuncs in
dnsController.

Add prototype of returns msg.Services via the Transfer function. Leave
expanding this to RRs out of scope for a bit.

* plugin/kubernetes: axfr

Respond to AXFR queries

* Fixing race condition

* Fixing instantiation of dnstest writer

* Updates from review
This commit is contained in:
Brad Beam
2018-02-08 10:11:04 -06:00
committed by Miek Gieben
parent 864f502356
commit 6fd954f19c
13 changed files with 383 additions and 18 deletions
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48
plugin/kubernetes/controller.go
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@@ -4,6 +4,7 @@ import (
"errors"
"fmt"
"sync"
"sync/atomic"
"time"
api "k8s.io/api/core/v1"
@@ -16,15 +17,15 @@ import (
"k8s.io/apimachinery/pkg/watch"
)
var (
namespace = api.NamespaceAll
)
var namespace = api.NamespaceAll
const podIPIndex = "PodIP"
const svcNameNamespaceIndex = "NameNamespace"
const svcIPIndex = "ServiceIP"
const epNameNamespaceIndex = "EndpointNameNamespace"
const epIPIndex = "EndpointsIP"
const (
podIPIndex = "PodIP"
svcNameNamespaceIndex = "NameNamespace"
svcIPIndex = "ServiceIP"
epNameNamespaceIndex = "EndpointNameNamespace"
epIPIndex = "EndpointsIP"
)
type dnsController interface {
ServiceList() []*api.Service
@@ -41,9 +42,17 @@ type dnsController interface {
Run()
HasSynced() bool
Stop() error
// Modified returns the timestamp of the most recent changes
Modified() int64
}
type dnsControl struct {
// Modified tracks timestamp of the most recent changes
// It needs to be first because it is guarnteed to be 8-byte
// aligned ( we use sync.LoadAtomic with this )
modified int64
client *kubernetes.Clientset
selector labels.Selector
@@ -86,7 +95,7 @@ func newdnsController(kubeClient *kubernetes.Clientset, opts dnsControlOpts) *dn
},
&api.Service{},
opts.resyncPeriod,
cache.ResourceEventHandlerFuncs{},
cache.ResourceEventHandlerFuncs{AddFunc: dns.Add, UpdateFunc: dns.Update, DeleteFunc: dns.Delete},
cache.Indexers{svcNameNamespaceIndex: svcNameNamespaceIndexFunc, svcIPIndex: svcIPIndexFunc})
if opts.initPodCache {
@@ -95,9 +104,9 @@ func newdnsController(kubeClient *kubernetes.Clientset, opts dnsControlOpts) *dn
ListFunc: podListFunc(dns.client, namespace, dns.selector),
WatchFunc: podWatchFunc(dns.client, namespace, dns.selector),
},
&api.Pod{}, // TODO replace with a lighter-weight custom struct
&api.Pod{},
opts.resyncPeriod,
cache.ResourceEventHandlerFuncs{},
cache.ResourceEventHandlerFuncs{AddFunc: dns.Add, UpdateFunc: dns.Update, DeleteFunc: dns.Delete},
cache.Indexers{podIPIndex: podIPIndexFunc})
}
dns.epLister, dns.epController = cache.NewIndexerInformer(
@@ -107,7 +116,7 @@ func newdnsController(kubeClient *kubernetes.Clientset, opts dnsControlOpts) *dn
},
&api.Endpoints{},
opts.resyncPeriod,
cache.ResourceEventHandlerFuncs{},
cache.ResourceEventHandlerFuncs{AddFunc: dns.Add, UpdateFunc: dns.Update, DeleteFunc: dns.Delete},
cache.Indexers{epNameNamespaceIndex: epNameNamespaceIndexFunc, epIPIndex: epIPIndexFunc})
return &dns
@@ -410,3 +419,18 @@ func (dns *dnsControl) GetNamespaceByName(name string) (*api.Namespace, error) {
}
return v1ns, nil
}
func (dns *dnsControl) Modified() int64 {
unix := atomic.LoadInt64(&dns.modified)
return unix
}
// updateModified set dns.modified to the current time.
func (dns *dnsControl) updateModifed() {
unix := time.Now().Unix()
atomic.StoreInt64(&dns.modified, unix)
}
func (dns *dnsControl) Add(obj interface{}) { dns.updateModifed() }
func (dns *dnsControl) Delete(obj interface{}) { dns.updateModifed() }
func (dns *dnsControl) Update(objOld, newObj interface{}) { dns.updateModifed() }