cluster.go

/*
Copyright 2021 The Karmada Authors.

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 framework

import (
	"context"
	"fmt"
	"os"
	"strings"
	"time"

	"github.com/onsi/gomega"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/wait"
	"k8s.io/client-go/dynamic"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
	"k8s.io/klog/v2"
	"sigs.k8s.io/controller-runtime/pkg/client"

	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
	karmada "github.com/karmada-io/karmada/pkg/generated/clientset/versioned"
	"github.com/karmada-io/karmada/pkg/util"
)

const (
	// MinimumCluster represents the minimum number of member clusters to run E2E test.
	MinimumCluster = 2
)

var (
	clusters              []*clusterv1alpha1.Cluster
	clusterNames          []string
	clusterClients        []*util.ClusterClient
	clusterDynamicClients []*util.DynamicClusterClient
	pullModeClusters      map[string]string
)

// Clusters will return all member clusters we have.
func Clusters() []*clusterv1alpha1.Cluster {
	return clusters
}

// ClusterNames will return all member clusters' names we have.
func ClusterNames() []string {
	return clusterNames
}

// ClusterNamesWithSyncMode will return member clusters' names which matches the sync mode.
func ClusterNamesWithSyncMode(mode clusterv1alpha1.ClusterSyncMode) []string {
	res := make([]string, 0, len(clusterNames))
	for _, cluster := range clusters {
		if cluster.Spec.SyncMode == mode {
			res = append(res, cluster.Name)
		}
	}
	return res
}

// InitClusterInformation init the E2E test's cluster information.
func InitClusterInformation(karmadaClient karmada.Interface, controlPlaneClient client.Client) {
	var err error

	pullModeClusters, err = fetchPullBasedClusters()
	gomega.Expect(err).ShouldNot(gomega.HaveOccurred())

	clusters, err = fetchClusters(karmadaClient)
	gomega.Expect(err).ShouldNot(gomega.HaveOccurred())

	var meetRequirement bool
	meetRequirement, err = isClusterMeetRequirements(clusters)
	gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
	gomega.Expect(meetRequirement).Should(gomega.BeTrue())

	for _, cluster := range clusters {
		clusterClient, clusterDynamicClient, err := newClusterClientSet(controlPlaneClient, cluster)
		gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
		clusterNames = append(clusterNames, cluster.Name)
		clusterClients = append(clusterClients, clusterClient)
		clusterDynamicClients = append(clusterDynamicClients, clusterDynamicClient)

		err = setClusterLabel(controlPlaneClient, cluster.Name)
		gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
	}
	gomega.Expect(clusterNames).Should(gomega.HaveLen(len(clusters)))
}

// GetClusterClient get cluster client
func GetClusterClient(clusterName string) kubernetes.Interface {
	for _, clusterClient := range clusterClients {
		if clusterClient.ClusterName == clusterName {
			return clusterClient.KubeClient
		}
	}

	return nil
}

// GetClusterDynamicClient get cluster dynamicClient
func GetClusterDynamicClient(clusterName string) dynamic.Interface {
	for _, clusterClient := range clusterDynamicClients {
		if clusterClient.ClusterName == clusterName {
			return clusterClient.DynamicClientSet
		}
	}

	return nil
}

func fetchPullBasedClusters() (map[string]string, error) {
	pullBasedClusters := os.Getenv("PULL_BASED_CLUSTERS")
	if pullBasedClusters == "" {
		return nil, nil
	}

	pullBasedClustersMap := make(map[string]string)
	pullBasedClusters = strings.TrimSuffix(pullBasedClusters, ";")
	clusterInfo := strings.Split(pullBasedClusters, ";")
	for _, cluster := range clusterInfo {
		clusterNameAndConfigPath := strings.Split(cluster, ":")
		if len(clusterNameAndConfigPath) != 2 {
			return nil, fmt.Errorf("failed to parse config path for cluster: %s", cluster)
		}
		pullBasedClustersMap[clusterNameAndConfigPath[0]] = clusterNameAndConfigPath[1]
	}
	return pullBasedClustersMap, nil
}

// fetchClusters will fetch all member clusters we have.
func fetchClusters(client karmada.Interface) ([]*clusterv1alpha1.Cluster, error) {
	clusterList, err := client.ClusterV1alpha1().Clusters().List(context.TODO(), metav1.ListOptions{})
	if err != nil {
		return nil, err
	}

	clusters := make([]*clusterv1alpha1.Cluster, 0, len(clusterList.Items))
	for _, cluster := range clusterList.Items {
		pinedCluster := cluster
		if pinedCluster.Spec.SyncMode == clusterv1alpha1.Pull {
			if _, exist := pullModeClusters[cluster.Name]; !exist {
				continue
			}
		}
		clusters = append(clusters, &pinedCluster)
	}

	return clusters, nil
}

// FetchCluster will fetch member cluster by name.
func FetchCluster(client karmada.Interface, clusterName string) (*clusterv1alpha1.Cluster, error) {
	cluster, err := client.ClusterV1alpha1().Clusters().Get(context.TODO(), clusterName, metav1.GetOptions{})
	if err != nil {
		return nil, err
	}

	return cluster, nil
}

// isClusterMeetRequirements checks if current environment meet the requirements of E2E.
func isClusterMeetRequirements(clusters []*clusterv1alpha1.Cluster) (bool, error) {
	// check if member cluster number meets requirements
	if len(clusters) < MinimumCluster {
		return false, fmt.Errorf("needs at lease %d member cluster to run, but got: %d", MinimumCluster, len(clusters))
	}

	// check if all member cluster status is ready
	for _, cluster := range clusters {
		if !util.IsClusterReady(&cluster.Status) {
			return false, fmt.Errorf("cluster %s not ready", cluster.GetName())
		}
	}

	klog.Infof("Got %d member cluster and all in ready state.", len(clusters))
	return true, nil
}

func newClusterClientSet(controlPlaneClient client.Client, c *clusterv1alpha1.Cluster) (*util.ClusterClient, *util.DynamicClusterClient, error) {
	if c.Spec.SyncMode == clusterv1alpha1.Push {
		clusterClient, err := util.NewClusterClientSet(c.Name, controlPlaneClient, nil)
		if err != nil {
			return nil, nil, err
		}
		clusterDynamicClient, err := util.NewClusterDynamicClientSet(c.Name, controlPlaneClient)
		if err != nil {
			return nil, nil, err
		}
		return clusterClient, clusterDynamicClient, nil
	}

	clusterConfigPath := pullModeClusters[c.Name]
	clusterConfig, err := LoadRESTClientConfig(clusterConfigPath, c.Name)
	if err != nil {
		return nil, nil, err
	}

	clusterClientSet := util.ClusterClient{ClusterName: c.Name}
	clusterDynamicClientSet := util.DynamicClusterClient{ClusterName: c.Name}
	clusterClientSet.KubeClient = kubernetes.NewForConfigOrDie(clusterConfig)
	clusterDynamicClientSet.DynamicClientSet = dynamic.NewForConfigOrDie(clusterConfig)

	return &clusterClientSet, &clusterDynamicClientSet, nil
}

// setClusterLabel set cluster label of E2E
func setClusterLabel(c client.Client, clusterName string) error {
	err := wait.PollImmediate(2*time.Second, 10*time.Second, func() (done bool, err error) {
		clusterObj := &clusterv1alpha1.Cluster{}
		if err := c.Get(context.TODO(), client.ObjectKey{Name: clusterName}, clusterObj); err != nil {
			if apierrors.IsConflict(err) {
				return false, nil
			}
			return false, err
		}
		if clusterObj.Labels == nil {
			clusterObj.Labels = make(map[string]string)
		}
		clusterObj.Labels["location"] = "CHN"
		if clusterObj.Spec.SyncMode == clusterv1alpha1.Push {
			clusterObj.Labels["sync-mode"] = "Push"
		}
		if err := c.Update(context.TODO(), clusterObj); err != nil {
			if apierrors.IsConflict(err) {
				return false, nil
			}
			return false, err
		}
		return true, nil
	})
	return err
}

// UpdateClusterLabels updates cluster labels.
func UpdateClusterLabels(client karmada.Interface, clusterName string, labels map[string]string) {
	gomega.Eventually(func() (bool, error) {
		cluster, err := client.ClusterV1alpha1().Clusters().Get(context.TODO(), clusterName, metav1.GetOptions{})
		if err != nil {
			return false, err
		}

		if cluster.Labels == nil {
			cluster.Labels = map[string]string{}
		}
		for key, value := range labels {
			cluster.Labels[key] = value
		}
		_, err = client.ClusterV1alpha1().Clusters().Update(context.TODO(), cluster, metav1.UpdateOptions{})
		if err != nil {
			return false, err
		}
		return true, nil
	}, pollTimeout, pollInterval).Should(gomega.Equal(true))
}

// DeleteClusterLabels deletes cluster labels if it exists.
func DeleteClusterLabels(client karmada.Interface, clusterName string, labels map[string]string) {
	gomega.Eventually(func() (bool, error) {
		cluster, err := client.ClusterV1alpha1().Clusters().Get(context.TODO(), clusterName, metav1.GetOptions{})
		if err != nil {
			return false, err
		}

		if cluster.Labels == nil {
			return true, nil
		}
		for key := range labels {
			delete(cluster.Labels, key)
		}
		_, err = client.ClusterV1alpha1().Clusters().Update(context.TODO(), cluster, metav1.UpdateOptions{})
		if err != nil {
			return false, err
		}
		return true, nil
	}, pollTimeout, pollInterval).Should(gomega.Equal(true))
}

// GetClusterNamesFromClusters will get Clusters' names form Clusters Object.
func GetClusterNamesFromClusters(clusters []*clusterv1alpha1.Cluster) []string {
	clusterNames := make([]string, 0, len(clusters))
	for _, cluster := range clusters {
		clusterNames = append(clusterNames, cluster.Name)
	}
	return clusterNames
}

// WaitClusterFitWith wait cluster fit with fit func.
func WaitClusterFitWith(c client.Client, clusterName string, fit func(cluster *clusterv1alpha1.Cluster) bool) {
	gomega.Eventually(func() (bool, error) {
		currentCluster, err := util.GetCluster(c, clusterName)
		if err != nil {
			return false, err
		}
		return fit(currentCluster), nil
	}, pollTimeout, pollInterval).Should(gomega.Equal(true))
}

// LoadRESTClientConfig creates a rest.Config using the passed kubeconfig. If context is empty, current context in kubeconfig will be used.
func LoadRESTClientConfig(kubeconfig string, context string) (*rest.Config, error) {
	loader := &clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeconfig}
	loadedConfig, err := loader.Load()
	if err != nil {
		return nil, err
	}

	if context == "" {
		context = loadedConfig.CurrentContext
	}
	klog.Infof("Use context %v", context)

	return clientcmd.NewNonInteractiveClientConfig(
		*loadedConfig,
		context,
		&clientcmd.ConfigOverrides{},
		loader,
	).ClientConfig()
}

// SetClusterRegion sets .Spec.Region field for Cluster object.
func SetClusterRegion(c client.Client, clusterName string, regionName string) error {
	return wait.PollImmediate(2*time.Second, 10*time.Second, func() (done bool, err error) {
		clusterObj := &clusterv1alpha1.Cluster{}
		if err := c.Get(context.TODO(), client.ObjectKey{Name: clusterName}, clusterObj); err != nil {
			if apierrors.IsConflict(err) {
				return false, nil
			}
			return false, err
		}

		clusterObj.Spec.Region = regionName
		if err := c.Update(context.TODO(), clusterObj); err != nil {
			if apierrors.IsConflict(err) {
				return false, nil
			}
			return false, err
		}
		return true, nil
	})
}