/
k8s_provider_leader.go
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/
k8s_provider_leader.go
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// Copyright 2023 Ant Group Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package pod
import (
"context"
"fmt"
"time"
v1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
"github.com/secretflow/kuscia/pkg/agent/resource"
"github.com/secretflow/kuscia/pkg/agent/utils/format"
"github.com/secretflow/kuscia/pkg/agent/utils/nodeutils"
"github.com/secretflow/kuscia/pkg/common"
"github.com/secretflow/kuscia/pkg/utils/nlog"
)
type nodeState int
const (
nodeStateNotExist = iota
nodeStateUnReady
nodeStateReady
)
type nodeStore struct {
rm *resource.KubeResourceManager
states map[string]nodeState
}
func newNodeStore(rm *resource.KubeResourceManager) *nodeStore {
return &nodeStore{
rm: rm,
states: map[string]nodeState{},
}
}
func (n *nodeStore) isNodeReady(nodeName string) (bool, error) {
if state, ok := n.states[nodeName]; ok {
return state == nodeStateReady, nil
}
state := nodeStateNotExist
node, err := n.rm.GetNode(nodeName)
if err != nil && !k8serrors.IsNotFound(err) {
return false, fmt.Errorf("failed to get node %q, detail-> %v", nodeName, err)
}
if err == nil {
if nodeutils.IsNodeReady(node) {
state = nodeStateReady
} else {
state = nodeStateUnReady
}
}
n.states[nodeName] = nodeState(state)
return state == nodeStateReady, nil
}
func (kp *K8sProvider) cleanupZombieResources(ctx context.Context) error {
nlog.Debugf("Start cleaning up zombie resources ...")
ns := newNodeStore(kp.resourceManager)
if err := kp.cleanupZombiePods(ctx, ns); err != nil {
nlog.Errorf("Failed to cleanup zombie pods, detail-> %v", err)
}
// TODO cleanup zombie leases
return nil
}
func (kp *K8sProvider) cleanupZombiePods(ctx context.Context, ns *nodeStore) error {
bkPodList, err := kp.podLister.List(labels.SelectorFromSet(labels.Set{common.LabelNodeNamespace: kp.namespace}))
if err != nil {
return fmt.Errorf("failed to list pod, detail-> %v", err)
}
for _, bkPod := range bkPodList {
isZombie, err := kp.isZombiePod(bkPod, ns)
if err != nil {
nlog.Errorf("Check if pod %v is zombie failed, detail-> %v", format.Pod(bkPod), err)
continue
}
if !isZombie {
continue
}
if err := kp.deleteZombiePod(ctx, bkPod); err != nil {
nlog.Errorf("Failed to delete zombie pod %v: %v", format.Pod(bkPod), err)
}
nlog.Infof("Delete zombie backend pod %v successfully", format.Pod(bkPod))
}
return nil
}
func (kp *K8sProvider) isZombiePod(bkPod *v1.Pod, ns *nodeStore) (bool, error) {
if bkPod.Labels == nil || bkPod.Labels[common.LabelNodeName] == "" {
return false, nil
}
ownerNodeName := bkPod.Labels[common.LabelNodeName]
ready, err := ns.isNodeReady(ownerNodeName)
if err != nil {
return false, fmt.Errorf("failed to check node %q is ready: %v", ownerNodeName, err)
}
if ready {
return false, nil
}
masterPod, err := kp.resourceManager.GetPod(bkPod.Name)
if k8serrors.IsNotFound(err) {
nlog.Infof("Node %v is not exist or unready and master pod is not exist, backend pod %v is zombie pod", ownerNodeName, format.Pod(bkPod))
return true, nil
} else if err != nil {
return false, fmt.Errorf("failed to get master pod %v: %v", format.Pod(bkPod), err)
}
if masterPod.DeletionTimestamp != nil {
nlog.Infof("Node %v is not exist or unready and master pod is terminating, backend pod %v is zombie pod", ownerNodeName, format.Pod(bkPod))
return true, nil
}
return false, nil
}
func (kp *K8sProvider) deleteZombiePod(ctx context.Context, bkPod *v1.Pod) error {
if err := kp.deleteBackendPod(ctx, bkPod.Namespace, bkPod.Name, nil); err != nil {
return err
}
return nil
}
func (kp *K8sProvider) cleanupSubResources(ctx context.Context) error {
configMaps, err := kp.configMapLister.List(labels.SelectorFromSet(labels.Set{common.LabelNodeNamespace: kp.namespace}))
if err != nil {
return fmt.Errorf("failed to list configmap, detail-> %v", err)
}
secrets, err := kp.secretLister.List(labels.SelectorFromSet(labels.Set{common.LabelNodeNamespace: kp.namespace}))
if err != nil {
return fmt.Errorf("failed to list secret, detail-> %v", err)
}
for _, configMap := range configMaps {
if err := cleanupSubResource[*v1.ConfigMap](ctx, configMap, kp.bkClient.CoreV1().Pods(kp.bkNamespace), kp.bkClient.CoreV1().ConfigMaps(kp.bkNamespace)); err != nil {
nlog.Warnf("Failed to cleanup configmap %q: %v", configMap.Name, err)
}
}
for _, secret := range secrets {
if err := cleanupSubResource[*v1.Secret](ctx, secret, kp.bkClient.CoreV1().Pods(kp.bkNamespace), kp.bkClient.CoreV1().Secrets(kp.bkNamespace)); err != nil {
nlog.Warnf("Failed to cleanup secret %q: %v", secret.Name, err)
}
}
return nil
}
// onNewLeader is executed when leader is changed.
func (kp *K8sProvider) onNewLeader(identity string) {
nlog.Infof("New leader has been elected: %s", identity)
}
// onStartedLeading is executed when leader started.
func (kp *K8sProvider) onStartedLeading(ctx context.Context) {
nlog.Infof("K8s provider %v start leading", kp.nodeName)
ticker := time.NewTicker(time.Minute)
for {
select {
case <-ctx.Done():
nlog.Infof("Context is done, exit leading")
return
case <-ticker.C:
if err := kp.cleanupZombieResources(context.Background()); err != nil {
nlog.Errorf("Failed to cleanup zombie pods: %v", err)
}
if err := kp.cleanupSubResources(context.Background()); err != nil {
nlog.Errorf("Failed to cleanup sub resource: %v", err)
}
}
}
}
// onStoppedLeading is executed when leader stopped.
func (kp *K8sProvider) onStoppedLeading() {
nlog.Warnf("K8s provider %v Leading stopped", kp.nodeName)
}