micro/registry/kubernetes/watcher.go

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package kubernetes
import (
"net"
"github.com/myodc/go-micro/registry"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/fields"
"k8s.io/kubernetes/pkg/labels"
"k8s.io/kubernetes/pkg/watch"
)
type watcher struct {
registry *kregistry
watcher watch.Interface
}
func (k *watcher) update(event watch.Event) {
if event.Object == nil {
return
}
var service *api.Service
switch obj := event.Object.(type) {
case *api.Service:
service = obj
default:
return
}
name, exists := service.ObjectMeta.Labels["name"]
if !exists {
return
}
switch event.Type {
case watch.Added, watch.Modified:
case watch.Deleted:
k.registry.mtx.Lock()
delete(k.registry.services, name)
k.registry.mtx.Unlock()
return
default:
return
}
serviceIP := net.ParseIP(service.Spec.ClusterIP)
k.registry.mtx.Lock()
k.registry.services[name] = &registry.Service{
Name: name,
Nodes: []*registry.Node{
&registry.Node{
Address: serviceIP.String(),
Port: service.Spec.Ports[0].Port,
},
},
}
k.registry.mtx.Unlock()
}
func (k *watcher) Stop() {
k.watcher.Stop()
}
func newWatcher(kr *kregistry) (registry.Watcher, error) {
svi := kr.client.Services(api.NamespaceAll)
services, err := svi.List(labels.Everything())
if err != nil {
return nil, err
}
watch, err := svi.Watch(labels.Everything(), fields.Everything(), services.ResourceVersion)
if err != nil {
return nil, err
}
w := &watcher{
registry: kr,
watcher: watch,
}
go func() {
for event := range watch.ResultChan() {
w.update(event)
}
}()
return w, nil
}