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cluster.go
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cluster.go
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package db
import (
"encoding/json"
"fmt"
"hash/fnv"
"net/url"
"strings"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
apiv1 "k8s.io/api/core/v1"
apierr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/selection"
"k8s.io/apimachinery/pkg/watch"
"github.com/argoproj/argo-cd/common"
appv1 "github.com/argoproj/argo-cd/pkg/apis/application/v1alpha1"
)
var (
localCluster = appv1.Cluster{
Server: common.KubernetesInternalAPIServerAddr,
ConnectionState: appv1.ConnectionState{Status: appv1.ConnectionStatusSuccessful},
}
)
func (db *db) listClusterSecrets() ([]*apiv1.Secret, error) {
labelSelector := labels.NewSelector()
req, err := labels.NewRequirement(common.LabelKeySecretType, selection.Equals, []string{common.LabelValueSecretTypeCluster})
if err != nil {
return nil, err
}
labelSelector = labelSelector.Add(*req)
secretsLister, err := db.settingsMgr.GetSecretsLister()
if err != nil {
return nil, err
}
clusterSecrets, err := secretsLister.Secrets(db.ns).List(labelSelector)
if err != nil {
return nil, err
}
return clusterSecrets, nil
}
// ListClusters returns list of clusters
func (db *db) ListClusters(ctx context.Context) (*appv1.ClusterList, error) {
clusterSecrets, err := db.listClusterSecrets()
if err != nil {
return nil, err
}
clusterList := appv1.ClusterList{
Items: make([]appv1.Cluster, len(clusterSecrets)),
}
hasInClusterCredentials := false
for i, clusterSecret := range clusterSecrets {
cluster := *secretToCluster(clusterSecret)
clusterList.Items[i] = cluster
if cluster.Server == common.KubernetesInternalAPIServerAddr {
hasInClusterCredentials = true
}
}
if !hasInClusterCredentials {
clusterList.Items = append(clusterList.Items, localCluster)
}
return &clusterList, nil
}
// CreateCluster creates a cluster
func (db *db) CreateCluster(ctx context.Context, c *appv1.Cluster) (*appv1.Cluster, error) {
secName, err := serverToSecretName(c.Server)
if err != nil {
return nil, err
}
clusterSecret := &apiv1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secName,
Labels: map[string]string{
common.LabelKeySecretType: common.LabelValueSecretTypeCluster,
},
Annotations: map[string]string{
common.AnnotationKeyManagedBy: common.AnnotationValueManagedByArgoCD,
},
},
}
clusterSecret.Data = clusterToData(c)
clusterSecret, err = db.kubeclientset.CoreV1().Secrets(db.ns).Create(clusterSecret)
if err != nil {
if apierr.IsAlreadyExists(err) {
return nil, status.Errorf(codes.AlreadyExists, "cluster %q already exists", c.Server)
}
return nil, err
}
return secretToCluster(clusterSecret), db.settingsMgr.ResyncInformers()
}
// ClusterEvent contains information about cluster event
type ClusterEvent struct {
Type watch.EventType
Cluster *appv1.Cluster
}
// WatchClusters allow watching for cluster events
func (db *db) WatchClusters(ctx context.Context, callback func(*ClusterEvent)) error {
listOpts := metav1.ListOptions{}
labelSelector := labels.NewSelector()
req, err := labels.NewRequirement(common.LabelKeySecretType, selection.Equals, []string{common.LabelValueSecretTypeCluster})
if err != nil {
return err
}
labelSelector = labelSelector.Add(*req)
listOpts.LabelSelector = labelSelector.String()
w, err := db.kubeclientset.CoreV1().Secrets(db.ns).Watch(listOpts)
if err != nil {
return err
}
localCls, err := db.GetCluster(ctx, common.KubernetesInternalAPIServerAddr)
if err != nil {
return err
}
defer w.Stop()
done := make(chan bool)
// trigger callback with event for local cluster since it always considered added
callback(&ClusterEvent{Type: watch.Added, Cluster: localCls})
go func() {
for next := range w.ResultChan() {
secret := next.Object.(*apiv1.Secret)
cluster := secretToCluster(secret)
// change local cluster event to modified or deleted, since it cannot be re-added or deleted
if cluster.Server == common.KubernetesInternalAPIServerAddr {
if next.Type == watch.Deleted {
next.Type = watch.Modified
cluster = &localCluster
} else if next.Type == watch.Added {
localCls = cluster
next.Type = watch.Modified
} else {
localCls = cluster
}
}
callback(&ClusterEvent{
Type: next.Type,
Cluster: cluster,
})
}
done <- true
}()
select {
case <-done:
case <-ctx.Done():
}
return nil
}
func (db *db) getClusterSecret(server string) (*apiv1.Secret, error) {
clusterSecrets, err := db.listClusterSecrets()
if err != nil {
return nil, err
}
for _, clusterSecret := range clusterSecrets {
if secretToCluster(clusterSecret).Server == server {
return clusterSecret, nil
}
}
return nil, status.Errorf(codes.NotFound, "cluster %q not found", server)
}
// GetCluster returns a cluster from a query
func (db *db) GetCluster(ctx context.Context, server string) (*appv1.Cluster, error) {
clusterSecret, err := db.getClusterSecret(server)
if err != nil {
if errorStatus, ok := status.FromError(err); ok && errorStatus.Code() == codes.NotFound && server == common.KubernetesInternalAPIServerAddr {
return &localCluster, nil
} else {
return nil, err
}
}
return secretToCluster(clusterSecret), nil
}
// UpdateCluster updates a cluster
func (db *db) UpdateCluster(ctx context.Context, c *appv1.Cluster) (*appv1.Cluster, error) {
clusterSecret, err := db.getClusterSecret(c.Server)
if err != nil {
return nil, err
}
clusterSecret.Data = clusterToData(c)
clusterSecret, err = db.kubeclientset.CoreV1().Secrets(db.ns).Update(clusterSecret)
if err != nil {
return nil, err
}
return secretToCluster(clusterSecret), db.settingsMgr.ResyncInformers()
}
// Delete deletes a cluster by name
func (db *db) DeleteCluster(ctx context.Context, name string) error {
secret, err := db.getClusterSecret(name)
if err != nil {
if errorStatus, ok := status.FromError(err); ok && errorStatus.Code() == codes.NotFound {
return nil
} else {
return err
}
}
canDelete := secret.Annotations != nil && secret.Annotations[common.AnnotationKeyManagedBy] == common.AnnotationValueManagedByArgoCD
if canDelete {
err = db.kubeclientset.CoreV1().Secrets(db.ns).Delete(secret.Name, &metav1.DeleteOptions{})
} else {
delete(secret.Labels, common.LabelKeySecretType)
_, err = db.kubeclientset.CoreV1().Secrets(db.ns).Update(secret)
}
if err != nil {
return err
}
return db.settingsMgr.ResyncInformers()
}
// serverToSecretName hashes server address to the secret name using a formula.
// Part of the server address is incorporated for debugging purposes
func serverToSecretName(server string) (string, error) {
serverURL, err := url.ParseRequestURI(server)
if err != nil {
return "", err
}
h := fnv.New32a()
_, _ = h.Write([]byte(server))
host := strings.ToLower(strings.Split(serverURL.Host, ":")[0])
return fmt.Sprintf("cluster-%s-%v", host, h.Sum32()), nil
}
// clusterToData converts a cluster object to string data for serialization to a secret
func clusterToData(c *appv1.Cluster) map[string][]byte {
data := make(map[string][]byte)
data["server"] = []byte(c.Server)
if c.Name == "" {
data["name"] = []byte(c.Server)
} else {
data["name"] = []byte(c.Name)
}
configBytes, err := json.Marshal(c.Config)
if err != nil {
panic(err)
}
data["config"] = configBytes
return data
}
// secretToCluster converts a secret into a repository object
func secretToCluster(s *apiv1.Secret) *appv1.Cluster {
var config appv1.ClusterConfig
err := json.Unmarshal(s.Data["config"], &config)
if err != nil {
panic(err)
}
cluster := appv1.Cluster{
Server: string(s.Data["server"]),
Name: string(s.Data["name"]),
Config: config,
}
return &cluster
}