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| package main
import (
"encoding/json"
"errors"
"flag"
"fmt"
"log"
"net/http"
"strings"
"github.com/pborman/uuid"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/restclient"
"k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/util/intstr"
)
var masterHost string
func init() {
flag.StringVar(&masterHost, "master", "http://127.0.0.1:8080", "usage")
flag.Parse()
}
type etcdClusterController struct {
kclient *unversioned.Client
}
func (c *etcdClusterController) Run() {
eventCh, errCh := monitorNewCluster()
for {
select {
case event := <-eventCh:
c.createCluster(event)
case err := <-errCh:
panic(err)
}
}
}
func (c *etcdClusterController) createCluster(event newCluster) {
size := event.Size
uuid := generateUUID()
initialCluster := []string{}
for i := 0; i < size; i++ {
initialCluster = append(initialCluster, fmt.Sprintf("etcd%d-%s=http://etcd%d-%s:2380", i, uuid, i, uuid))
}
for i := 0; i < size; i++ {
etcdName := fmt.Sprintf("etcd%d-%s", i, uuid)
svc := makeEtcdService(etcdName, uuid)
_, err := c.kclient.Services("default").Create(svc)
if err != nil {
panic(err)
}
// TODO: add and expose client port
pod := makeEtcdPod(etcdName, uuid, initialCluster)
_, err = c.kclient.Pods("default").Create(pod)
if err != nil {
panic(err)
}
}
}
type newCluster struct {
Kind string `json:"kind"`
ApiVersion string `json:"apiVersion"`
Metadata map[string]string `json:"metadata"`
Size int `json:"size"`
}
type Event struct {
Type string
Object newCluster
}
func monitorNewCluster() (<-chan newCluster, <-chan error) {
events := make(chan newCluster)
errc := make(chan error, 1)
go func() {
resp, err := http.Get(masterHost + "/apis/coreos.com/v1/namespaces/default/etcdclusters?watch=true")
if err != nil {
errc <- err
return
}
if resp.StatusCode != 200 {
errc <- errors.New("Invalid status code: " + resp.Status)
return
}
log.Println("start watching...")
for {
decoder := json.NewDecoder(resp.Body)
var ev Event
err = decoder.Decode(&ev)
if err != nil {
errc <- err
}
event := ev.Object
log.Println("new cluster size:", event.Size)
events <- event
}
}()
return events, errc
}
func main() {
c := &etcdClusterController{
kclient: mustCreateClient(masterHost),
}
log.Println("etcd cluster controller starts running...")
c.Run()
}
func mustCreateClient(host string) *unversioned.Client {
cfg := &restclient.Config{
Host: host,
QPS: 100,
Burst: 100,
}
c, err := unversioned.New(cfg)
if err != nil {
panic(err)
}
return c
}
func generateUUID() string {
return uuid.New()
}
func makeEtcdService(etcdName, uuid string) *api.Service {
labels := map[string]string{
"etcd_node": etcdName,
"etcd_uuid": uuid,
}
svc := &api.Service{
ObjectMeta: api.ObjectMeta{
Name: etcdName,
Labels: labels,
},
Spec: api.ServiceSpec{
Ports: []api.ServicePort{{
Name: "server",
Port: 2380,
TargetPort: intstr.FromInt(2380),
Protocol: api.ProtocolTCP,
}},
Selector: labels,
},
}
return svc
}
func makeEtcdPod(etcdName, uuid string, initialCluster []string) *api.Pod {
pod := &api.Pod{
ObjectMeta: api.ObjectMeta{
Name: etcdName,
Labels: map[string]string{
"app": "etcd",
"etcd_node": etcdName,
"etcd_uuid": uuid,
},
},
Spec: api.PodSpec{
Containers: []api.Container{
{
Command: []string{
"/usr/local/bin/etcd",
"--name",
etcdName,
"--initial-advertise-peer-urls",
fmt.Sprintf("http://%s:2380", etcdName),
"--listen-peer-urls",
"http://0.0.0.0:2380",
"--listen-client-urls",
"http://0.0.0.0:2379",
"--advertise-client-urls",
fmt.Sprintf("http://%s:2379", etcdName),
"--initial-cluster",
strings.Join(initialCluster, ","),
"--initial-cluster-state",
"new",
},
Name: etcdName,
Image: "gcr.io/coreos-k8s-scale-testing/etcd-amd64:3.0.4",
Ports: []api.ContainerPort{
{
Name: "server",
ContainerPort: int32(2380),
Protocol: api.ProtocolTCP,
},
},
},
},
RestartPolicy: api.RestartPolicyNever,
},
}
return pod
}
|