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pvc.go
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pvc.go
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package pvc
import (
"context"
"fmt"
"strings"
"time"
"github.com/caicloud/nirvana/log"
core_v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"github.com/caicloud/cyclone/pkg/apis/cyclone/v1alpha1"
"github.com/caicloud/cyclone/pkg/meta"
"github.com/caicloud/cyclone/pkg/server/biz/accelerator/cleaner"
"github.com/caicloud/cyclone/pkg/server/biz/usage"
"github.com/caicloud/cyclone/pkg/server/common"
"github.com/caicloud/cyclone/pkg/util/cerr"
"github.com/caicloud/cyclone/pkg/util/retry"
)
// CreatePVC creates pvc for tenant
func CreatePVC(tenantName, storageClass, size string, namespace string, client *kubernetes.Clientset) error {
// parse quantity
resources := make(map[core_v1.ResourceName]resource.Quantity)
quantity, err := resource.ParseQuantity(size)
if err != nil {
log.Errorf("Parse Quantity %s error %v", size, err)
return err
}
resources[core_v1.ResourceStorage] = quantity
// create pvc
pvcName := common.TenantPVC(tenantName)
nsname := common.TenantNamespace(tenantName)
if namespace != "" {
nsname = namespace
}
volume := &core_v1.PersistentVolumeClaim{
ObjectMeta: meta_v1.ObjectMeta{
Name: pvcName,
Namespace: nsname,
},
Spec: core_v1.PersistentVolumeClaimSpec{
AccessModes: []core_v1.PersistentVolumeAccessMode{core_v1.ReadWriteMany},
Resources: core_v1.ResourceRequirements{
Limits: resources,
Requests: resources,
},
},
}
if storageClass != "" {
volume.Spec.StorageClassName = &storageClass
}
_, err = client.CoreV1().PersistentVolumeClaims(nsname).Create(context.TODO(), volume, meta_v1.CreateOptions{})
if err != nil {
log.Errorf("Create persistent volume claim %s error %v", pvcName, err)
return err
}
// Launch PVC usage watcher to watch the usage of PVC.
err = usage.LaunchPVCUsageWatcher(client, tenantName, v1alpha1.ExecutionContext{
Namespace: nsname,
PVC: pvcName,
})
if err != nil {
log.Errorf("Launch PVC usage watcher for %s/%s error: %v", nsname, pvcName, err)
return err
}
return nil
}
// DeletePVC delete the pvc
func DeletePVC(tenantName, namespace string, client *kubernetes.Clientset) error {
pvcName := common.TenantPVC(tenantName)
nsname := common.TenantNamespace(tenantName)
if namespace != "" {
nsname = namespace
}
err := usage.DeletePVCUsageWatcher(client, nsname)
if err != nil && !errors.IsNotFound(err) {
log.Errorf("delete pvc usage watcher in namespace %s failed %s", nsname, err)
return err
}
err = cleaner.StopReasonNoNeed(client, nsname, cleaner.NoNeedReasonPVCDeleted)
if err != nil {
log.Errorf("stop caches cleanup pod error: %s", err)
return err
}
err = client.CoreV1().PersistentVolumeClaims(nsname).Delete(context.TODO(), pvcName, meta_v1.DeleteOptions{})
if err != nil && !errors.IsNotFound(err) {
log.Errorf("delete persistent volume claim %s error %v", pvcName, err)
return err
}
return nil
}
// ConfirmPVCDeleted confirms whether the PVC and PVC watchdog have been deleted.
// Only return nil represents the PVC and PVC watchdog have been deleted.
func ConfirmPVCDeleted(tenantName, namespace string, client *kubernetes.Clientset) error {
pvcName := common.TenantPVC(tenantName)
nsname := common.TenantNamespace(tenantName)
if namespace != "" {
nsname = namespace
}
_, err := usage.GetPVCUsageWatcher(client, nsname)
if err == nil {
return fmt.Errorf("PVC watchdog for tenant %s has not been deleted", tenantName)
}
if !errors.IsNotFound(err) {
return err
}
_, err = client.CoreV1().PersistentVolumeClaims(nsname).Get(context.TODO(), pvcName, meta_v1.GetOptions{})
if err == nil {
return fmt.Errorf("PVC for tenant %s has not been deleted", tenantName)
}
if !errors.IsNotFound(err) {
return err
}
return nil
}
// UpdatePVC delete the old pvc and recreate another one, so the data of the pvc will lost.
func UpdatePVC(tenantName, storageClass, size string, namespace string, client *kubernetes.Clientset) error {
// Can not update pvc when there are workflows running.
pods, err := client.CoreV1().Pods(namespace).List(context.TODO(), meta_v1.ListOptions{
LabelSelector: fmt.Sprintf("%s in (%s, %s)", meta.LabelPodKind, meta.PodKindWorkload, meta.PodKindGC),
})
if err != nil {
log.Warning("list pvc watcher pods error: ", err)
return err
}
var wfrsName = make(map[string]struct{})
for _, pod := range pods.Items {
if pod.Labels != nil && pod.Labels[meta.LabelWorkflowRunName] != "" {
wfrsName[pod.Labels[meta.LabelWorkflowRunName]] = struct{}{}
}
}
if len(wfrsName) > 0 {
var wfrsNameString string
for name := range wfrsName {
wfrsNameString = fmt.Sprintf("%s,%s", wfrsNameString, name)
}
return cerr.ErrorExistRunningWorkflowRuns.Error(strings.Trim(wfrsNameString, ","))
}
// Recreate PVC
err = DeletePVC(tenantName, namespace, client)
if err != nil {
return err
}
backoff := wait.Backoff{
Steps: 12,
Duration: 5 * time.Second,
Factor: 1.0,
Jitter: 0.1,
}
// Wait for the PVC and PVC watchdog deleting completed
err = retry.OnError(backoff, func() error {
return ConfirmPVCDeleted(tenantName, namespace, client)
})
if err != nil {
return err
}
// Create a new PVC
err = retry.OnError(backoff, func() error {
return CreatePVC(tenantName, storageClass, size, namespace, client)
})
if err != nil {
return err
}
return nil
}