/
kubernetes.go
195 lines (161 loc) · 4.4 KB
/
kubernetes.go
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package adapter
import (
"context"
"errors"
"fmt"
"github.com/sakuraapp/shared/pkg/model"
"github.com/sakuraapp/supervisor/internal/config"
"github.com/sakuraapp/supervisor/internal/supervisor"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
"math"
"os"
"path/filepath"
"strconv"
)
var configErr = errors.New("couldn't find kubeconfig")
const (
namespace = "rooms"
podName = "room-%v"
)
type KubernetesAdapter struct {
conf *config.Config
clientset *kubernetes.Clientset
}
func (a *KubernetesAdapter) createPod(roomId model.RoomId, region supervisor.Region) *corev1.Pod {
conf := a.conf
strRoomId := strconv.FormatInt(int64(roomId), 10)
nodeSelector := map[string]string{}
if region != supervisor.RegionANY {
nodeSelector["region"] = string(region)
}
return &corev1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: fmt.Sprintf(podName, roomId),
Namespace: namespace,
Labels: map[string]string{
"room": strRoomId,
"kind": "room",
},
},
Spec: corev1.PodSpec{
Volumes: []corev1.Volume{
{
Name: "dshm",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{
Medium: corev1.StorageMediumMemory,
},
},
},
},
Containers: []corev1.Container{
{
Image: conf.RoomImage,
Resources: corev1.ResourceRequirements{
Limits: map[corev1.ResourceName]resource.Quantity{
corev1.ResourceCPU: conf.RoomCPULimit,
corev1.ResourceMemory: conf.RoomMemoryLimit,
},
Requests: map[corev1.ResourceName]resource.Quantity{
corev1.ResourceCPU: conf.RoomCPURequests,
corev1.ResourceMemory: conf.RoomMemoryRequests,
},
},
VolumeMounts: []corev1.VolumeMount{
{
Name: "dshm",
MountPath: "/dev/shm",
},
},
Env: []corev1.EnvVar{
{
Name: "ROOM_ID",
Value: strRoomId,
},
{
Name: "CHAKRA_ADDR",
Value: conf.ChakraAddr,
},
},
},
},
NodeSelector: nodeSelector,
},
}
}
func (a *KubernetesAdapter) Deploy(ctx context.Context, roomId model.RoomId, region supervisor.Region) error {
var err error
pod := a.createPod(roomId, region)
pod, err = a.clientset.CoreV1().Pods(namespace).Create(ctx, pod, metav1.CreateOptions{})
return err
}
func (a *KubernetesAdapter) Destroy(ctx context.Context, roomId model.RoomId) error {
name := fmt.Sprintf(podName, roomId)
return a.clientset.CoreV1().Pods(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (a *KubernetesAdapter) GetAvailableRooms(ctx context.Context, region supervisor.Region) (int64, error) {
matchLabels := map[string]string{}
if region != supervisor.RegionANY {
matchLabels["region"] = string(region)
}
selector, err := metav1.LabelSelectorAsSelector(&metav1.LabelSelector{
MatchLabels: matchLabels,
})
if err != nil {
return 0, err
}
nodeList, err := a.clientset.CoreV1().Nodes().List(ctx, metav1.ListOptions{
LabelSelector: selector.String(),
})
if err != nil {
return 0, err
}
memoryPerRoom := a.conf.RoomMemoryLimit
cpuPerRoom := a.conf.RoomCPULimit
var availRooms int64
for _, node := range nodeList.Items {
allocatable := node.Status.Allocatable
mem := allocatable.Memory()
cpu := allocatable.Cpu()
availRoomsMem := math.Floor(float64(mem.Value() / memoryPerRoom.Value()))
availRoomsCpu := math.Floor(float64(cpu.Value() / cpuPerRoom.Value()))
availRooms = availRooms + int64(math.Min(availRoomsMem, availRoomsCpu))
}
return availRooms, nil
}
func NewKubernetesAdapter(conf *config.Config) (*KubernetesAdapter, error) {
var myConfig *rest.Config
var err error
if os.Getenv("KUBERNETES_SERVICE_HOST") != "" {
// in-cluster
myConfig, err = rest.InClusterConfig()
} else {
// out-of-cluster
var kubeconfig string
if conf.K8SConfigPath != "" {
kubeconfig = conf.K8SConfigPath
} else if home := homedir.HomeDir(); home != "" {
kubeconfig = filepath.Join(home, ".kube", "config")
} else {
return nil, configErr
}
myConfig, err = clientcmd.BuildConfigFromFlags("", kubeconfig)
}
if err != nil {
return nil, err
}
clientset, err := kubernetes.NewForConfig(myConfig)
if err != nil {
return nil, err
}
return &KubernetesAdapter{
conf: conf,
clientset: clientset,
}, nil
}