micro/registry/kubernetes/kubernetes.go

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package kubernetes
import (
"fmt"
"os"
"sync"
"github.com/myodc/go-micro/registry"
k8s "github.com/GoogleCloudPlatform/kubernetes/pkg/client"
"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
)
type kregistry struct {
client *k8s.Client
namespace string
mtx sync.RWMutex
services map[string]registry.Service
}
func (c *kregistry) Watch() {
newWatcher(c)
}
func (c *kregistry) Deregister(s registry.Service) error {
return nil
}
func (c *kregistry) Register(s registry.Service) error {
return nil
}
func (c *kregistry) GetService(name string) (registry.Service, error) {
c.mtx.RLock()
svc, ok := c.services[name]
c.mtx.RUnlock()
if ok {
return svc, nil
}
selector := labels.SelectorFromSet(labels.Set{"name": name})
services, err := c.client.Services(c.namespace).List(selector)
if err != nil {
return nil, err
}
if len(services.Items) == 0 {
return nil, fmt.Errorf("Service not found")
}
ks := &service{name: name}
for _, item := range services.Items {
ks.nodes = append(ks.nodes, &node{
address: item.Spec.PortalIP,
port: item.Spec.Ports[0].Port,
})
}
return ks, nil
}
func (c *kregistry) ListServices() ([]registry.Service, error) {
c.mtx.RLock()
serviceMap := c.services
c.mtx.RUnlock()
var services []registry.Service
if len(serviceMap) > 0 {
for _, service := range serviceMap {
services = append(services, service)
}
return services, nil
}
rsp, err := c.client.Services(c.namespace).List(labels.Everything())
if err != nil {
return nil, err
}
for _, svc := range rsp.Items {
if len(svc.ObjectMeta.Labels["name"]) == 0 {
continue
}
services = append(services, &service{
name: svc.ObjectMeta.Labels["name"],
})
}
return services, nil
}
func (c *kregistry) NewService(name string, nodes ...registry.Node) registry.Service {
var snodes []*node
for _, nod := range nodes {
if n, ok := nod.(*node); ok {
snodes = append(snodes, n)
}
}
return &service{
name: name,
nodes: snodes,
}
}
func (c *kregistry) NewNode(id, address string, port int) registry.Node {
return &node{
id: id,
address: address,
port: port,
}
}
func NewRegistry(addrs []string, opts ...registry.Option) registry.Registry {
host := "http://" + os.Getenv("KUBERNETES_RO_SERVICE_HOST") + ":" + os.Getenv("KUBERNETES_RO_SERVICE_PORT")
if len(addrs) > 0 {
host = addrs[0]
}
client, _ := k8s.New(&k8s.Config{
Host: host,
})
kr := &kregistry{
client: client,
namespace: "default",
services: make(map[string]registry.Service),
}
kr.Watch()
return kr
}