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kubermanager.go
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kubermanager.go
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package session
import (
"fmt"
"os/signal"
"k8s.io/api/core/v1"
log "github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/client-go/kubernetes"
//"k8s.io/client-go/rest"
"os"
"path/filepath"
"strconv"
"syscall"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
const NAME_SPACE string = "default"
const SERVER_AMOUNT int = 1
const MAX_SERVER_AMOUT int = 20
const MAX_PORT int = 31000
const MIN_PORT int = 30000
//MAX_ROOM_IN_POD maxium rooms in pod
const MAX_ROOM_IN_POD = 1
var interrupt chan os.Signal
var PodMod *v1.Pod
//ClusterManager clustermanager's instance
var ClusterManager *clusterManager
//ClusterManager manage kubernete's cluster and gameplayServer
type clusterManager struct {
client *kubernetes.Clientset
pods map[string]*v1.Pod
PodAmount int
}
//KubeClientSet create clientset
func (c *clusterManager) KubeClientSet() {
//config, err := rest.InClusterConfig()
config, err := clientcmd.BuildConfigFromFlags("", filepath.Join(os.Getenv("HOME"), ".kube", "config"))
if err != nil {
log.Warn(err)
config, err = rest.InClusterConfig()
if err != nil {
log.Fatal(err)
}
}
clientset, err := kubernetes.NewForConfig(config)
c.client = clientset
//log.Debug(config, clientset)
//clientset.CoreV1().Services("NAME_SPACE")
ex, err := os.Executable()
if err != nil {
panic(err)
}
exPath := filepath.Dir(ex)
fmt.Println(exPath)
p, _ := os.Getwd()
f, err := os.Open(filepath.Join(p, "cluster/pod.yaml"))
if err != nil {
log.Fatal(ex, "not found:", err)
return
}
yamlde := yaml.NewYAMLOrJSONDecoder(f, 300)
podInfo := &v1.Pod{}
if err = yamlde.Decode(podInfo); err != nil {
log.Debug("yaml parse fail", err)
}
//log.Debug("pod info :", podInfo)
PodMod = podInfo.DeepCopy()
// id: ''
// agentToGamePort: ''
// clientToGamePort: ''
// clientToAgentPort: ''
if MIN_PORT+SERVER_AMOUNT*2 > MAX_PORT {
panic("Usable port is not enough.")
}
for i := 0; i < SERVER_AMOUNT; i++ {
c.CreatePod()
}
}
//CreatePod scale gameplay server
func (c *clusterManager) CreatePod() {
if c.PodAmount == MAX_SERVER_AMOUT {
return
}
i := c.PodAmount
podInfo := PodMod.DeepCopy()
podInfo.Name = "gameplayserver-" + strconv.Itoa(i)
podInfo.Labels["type"] = "game"
podInfo.Labels["id"] = strconv.Itoa(i)
podInfo.Labels["agentToGamePort"] = strconv.Itoa(MIN_PORT + i*2)
podInfo.Labels["clientToGamePort"] = strconv.Itoa(MIN_PORT + i*2 + 1)
_, err := c.client.CoreV1().Pods(NAME_SPACE).Create(podInfo.DeepCopy())
if err != nil {
log.Warn(err)
if errors.IsAlreadyExists(err) {
policy := metav1.DeletePropagationForeground
deleteTime := int64(0)
c.client.CoreV1().Pods(NAME_SPACE).Delete(podInfo.Name, &metav1.DeleteOptions{GracePeriodSeconds: &deleteTime, PropagationPolicy: &policy})
_, err := c.client.CoreV1().Pods(NAME_SPACE).Create(podInfo.DeepCopy())
if err != nil {
log.Fatal("Create Fail", err)
}
}
}
c.pods[podInfo.Labels["id"]], err = c.client.CoreV1().Pods(NAME_SPACE).Get(podInfo.Name, metav1.GetOptions{})
if err != nil {
log.Warn(err)
}
nodeName := c.pods[podInfo.Labels["id"]].Spec.NodeName
node, err := c.client.CoreV1().Nodes().Get(nodeName, metav1.GetOptions{})
if err != nil {
log.Fatal(err)
}
extIP := ""
for _, add := range node.Status.Addresses {
if add.Type == v1.NodeExternalIP {
extIP = add.Address
break
}
}
RoomManager.ConnectGameServer(extIP, podInfo.Labels["clientToGamePort"], podInfo.Labels["agentToGamePort"], podInfo.Labels["id"])
log.Info("Gameplyer Server created: id: ", podInfo.Labels["id"], " IP: ", extIP, " Client Port: ", podInfo.Labels["clientToGamePort"], " Agent Port: ", podInfo.Labels["agentToGamePort"])
c.PodAmount++
}
func cleanUp() {
<-interrupt
log.Info("Stopping agent")
log.Info("Stopping gameplayer server")
for _, pod := range ClusterManager.pods {
err := ClusterManager.client.CoreV1().Pods(NAME_SPACE).Delete(pod.Name, &metav1.DeleteOptions{})
if err != nil {
log.Warn(err)
}
}
os.Exit(1)
}
func init() {
if os.Getenv("DONT_USE_KUBE") == "true" {
return
}
ClusterManager = &clusterManager{
pods: make(map[string]*v1.Pod),
}
interrupt = make(chan os.Signal)
signal.Notify(interrupt, os.Interrupt, syscall.SIGTERM)
go cleanUp()
}