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Adding label selector support to Corefile (#208)

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* Adding parsing for label selector to Corefile

* Updating comment typo in k8sCorefile

* Adding implementation of label support to filter exposed objects

* Updating TODO list
This commit is contained in:
Michael Richmond 2016-08-12 20:44:08 -07:00 • committed by GitHub
parent 3b7b9b49d5
commit ad2838b916
6 changed files with 194 additions and 47 deletions
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38
middleware/kubernetes/kubernetes.go
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@ -15,20 +15,24 @@ import (
"github.com/miekg/dns"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/unversioned"
unversionedapi "k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/labels"
unversionedclient "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
clientcmdapi "k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
)
type Kubernetes struct {
Next middleware.Handler
Zones []string
Proxy proxy.Proxy // Proxy for looking up names during the resolution process
APIEndpoint string
APIConn *dnsController
ResyncPeriod time.Duration
NameTemplate *nametemplate.NameTemplate
Namespaces []string
Next middleware.Handler
Zones []string
Proxy proxy.Proxy // Proxy for looking up names during the resolution process
APIEndpoint string
APIConn *dnsController
ResyncPeriod time.Duration
NameTemplate *nametemplate.NameTemplate
Namespaces []string
LabelSelector *unversionedapi.LabelSelector
Selector *labels.Selector
}
func (g *Kubernetes) StartKubeCache() error {
@ -45,14 +49,26 @@ func (g *Kubernetes) StartKubeCache() error {
log.Printf("[debug] error connecting to the client: %v", err)
return err
}
kubeClient, err := unversioned.New(config)
kubeClient, err := unversionedclient.New(config)
if err != nil {
log.Printf("[ERROR] Failed to create kubernetes notification controller: %v", err)
return err
}
if g.LabelSelector == nil {
log.Printf("[INFO] Kubernetes middleware configured without a label selector. No label-based filtering will be operformed.")
} else {
var selector labels.Selector
selector, err = unversionedapi.LabelSelectorAsSelector(g.LabelSelector)
g.Selector = &selector
if err != nil {
log.Printf("[ERROR] Unable to create Selector for LabelSelector '%s'.Error was: %s", g.LabelSelector, err)
return err
}
log.Printf("[INFO] Kubernetes middleware configured with the label selector '%s'. Only kubernetes objects matching this label selector will be exposed.", unversionedapi.FormatLabelSelector(g.LabelSelector))
}
log.Printf("[debug] Starting kubernetes middleware with k8s API resync period: %s", g.ResyncPeriod)
g.APIConn = newdnsController(kubeClient, g.ResyncPeriod)
g.APIConn = newdnsController(kubeClient, g.ResyncPeriod, g.Selector)
go g.APIConn.Run()