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manager.go
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manager.go
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// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 controller
import (
"context"
"encoding/json"
"fmt"
"strings"
"github.com/aws/amazon-vpc-resource-controller-k8s/test/framework/utils"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
DeploymentName = "vpc-resource-local-controller"
Namespace = "kube-system"
LeaderLeaseMapName = "cp-vpc-resource-controller"
PodLabelKey = "app"
PodLabelVal = "vpc-resource-controller"
ClusterRoleName = "vpc-resource-controller-role"
)
type LeaderLease struct {
HolderIdentity string
}
type Manager interface {
WaitTillControllerHasLeaderLease(ctx context.Context) (string, error)
}
func NewManager(k8sClient client.Client) Manager {
return &defaultManager{k8sClient: k8sClient}
}
type defaultManager struct {
k8sClient client.Client
}
func (d *defaultManager) WaitTillControllerHasLeaderLease(ctx context.Context) (string, error) {
leaderLeaseMap := &v1.ConfigMap{}
controllerPods := &v1.PodList{}
err := d.k8sClient.List(ctx, controllerPods, &client.ListOptions{
LabelSelector: labels.SelectorFromSet(labels.Set{PodLabelKey: PodLabelVal}),
})
if err != nil {
return "", err
}
var leaderPodName string
err = wait.PollUntil(utils.PollIntervalMedium, func() (done bool, err error) {
err = d.k8sClient.Get(ctx, types.NamespacedName{
Namespace: Namespace,
Name: LeaderLeaseMapName,
}, leaderLeaseMap)
if err != nil {
return false, err
}
key, found := leaderLeaseMap.ObjectMeta.
Annotations["control-plane.alpha.kubernetes.io/leader"]
if !found {
return false, fmt.Errorf("failed to find leader election configmap")
}
lease := &LeaderLease{}
err = json.Unmarshal([]byte(key), lease)
if err != nil {
return false, err
}
for _, pod := range controllerPods.Items {
// The Holder identity consists of the Leader Pod name + random UID
if strings.Contains(lease.HolderIdentity, pod.Name) {
leaderPodName = pod.Name
return true, nil
}
}
return false, nil
}, ctx.Done())
return leaderPodName, err
}