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cluster.go
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cluster.go
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package generators
import (
"context"
"fmt"
"time"
log "github.com/sirupsen/logrus"
"github.com/argoproj/argo-cd/v2/util/settings"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/argoproj/argo-cd/v2/applicationset/utils"
argoappsetv1alpha1 "github.com/argoproj/argo-cd/v2/pkg/apis/application/v1alpha1"
)
const (
ArgoCDSecretTypeLabel = "argocd.argoproj.io/secret-type"
ArgoCDSecretTypeCluster = "cluster"
)
var _ Generator = (*ClusterGenerator)(nil)
// ClusterGenerator generates Applications for some or all clusters registered with ArgoCD.
type ClusterGenerator struct {
client.Client
ctx context.Context
clientset kubernetes.Interface
// namespace is the Argo CD namespace
namespace string
settingsManager *settings.SettingsManager
}
var render = &utils.Render{}
func NewClusterGenerator(c client.Client, ctx context.Context, clientset kubernetes.Interface, namespace string) Generator {
settingsManager := settings.NewSettingsManager(ctx, clientset, namespace)
g := &ClusterGenerator{
Client: c,
ctx: ctx,
clientset: clientset,
namespace: namespace,
settingsManager: settingsManager,
}
return g
}
// GetRequeueAfter never requeue the cluster generator because the `clusterSecretEventHandler` will requeue the appsets
// when the cluster secrets change
func (g *ClusterGenerator) GetRequeueAfter(appSetGenerator *argoappsetv1alpha1.ApplicationSetGenerator) time.Duration {
return NoRequeueAfter
}
func (g *ClusterGenerator) GetTemplate(appSetGenerator *argoappsetv1alpha1.ApplicationSetGenerator) *argoappsetv1alpha1.ApplicationSetTemplate {
return &appSetGenerator.Clusters.Template
}
func (g *ClusterGenerator) GenerateParams(
appSetGenerator *argoappsetv1alpha1.ApplicationSetGenerator, appSet *argoappsetv1alpha1.ApplicationSet) ([]map[string]interface{}, error) {
if appSetGenerator == nil {
return nil, EmptyAppSetGeneratorError
}
if appSetGenerator.Clusters == nil {
return nil, EmptyAppSetGeneratorError
}
// Do not include the local cluster in the cluster parameters IF there is a non-empty selector
// - Since local clusters do not have secrets, they do not have labels to match against
ignoreLocalClusters := len(appSetGenerator.Clusters.Selector.MatchExpressions) > 0 || len(appSetGenerator.Clusters.Selector.MatchLabels) > 0
// ListCluster from Argo CD's util/db package will include the local cluster in the list of clusters
clustersFromArgoCD, err := utils.ListClusters(g.ctx, g.clientset, g.namespace)
if err != nil {
return nil, err
}
if clustersFromArgoCD == nil {
return nil, nil
}
clusterSecrets, err := g.getSecretsByClusterName(appSetGenerator)
if err != nil {
return nil, err
}
res := []map[string]interface{}{}
secretsFound := []corev1.Secret{}
for _, cluster := range clustersFromArgoCD.Items {
// If there is a secret for this cluster, then it's a non-local cluster, so it will be
// handled by the next step.
if secretForCluster, exists := clusterSecrets[cluster.Name]; exists {
secretsFound = append(secretsFound, secretForCluster)
} else if !ignoreLocalClusters {
// If there is no secret for the cluster, it's the local cluster, so handle it here.
params := map[string]interface{}{}
params["name"] = cluster.Name
params["nameNormalized"] = cluster.Name
params["server"] = cluster.Server
err = appendTemplatedValues(appSetGenerator.Clusters.Values, params, appSet)
if err != nil {
return nil, err
}
res = append(res, params)
log.WithField("cluster", "local cluster").Info("matched local cluster")
}
}
// For each matching cluster secret (non-local clusters only)
for _, cluster := range secretsFound {
params := map[string]interface{}{}
params["name"] = string(cluster.Data["name"])
params["nameNormalized"] = utils.SanitizeName(string(cluster.Data["name"]))
params["server"] = string(cluster.Data["server"])
if appSet.Spec.GoTemplate {
meta := map[string]interface{}{}
if len(cluster.ObjectMeta.Annotations) > 0 {
meta["annotations"] = cluster.ObjectMeta.Annotations
}
if len(cluster.ObjectMeta.Labels) > 0 {
meta["labels"] = cluster.ObjectMeta.Labels
}
params["metadata"] = meta
} else {
for key, value := range cluster.ObjectMeta.Annotations {
params[fmt.Sprintf("metadata.annotations.%s", key)] = value
}
for key, value := range cluster.ObjectMeta.Labels {
params[fmt.Sprintf("metadata.labels.%s", key)] = value
}
}
err = appendTemplatedValues(appSetGenerator.Clusters.Values, params, appSet)
if err != nil {
return nil, err
}
res = append(res, params)
log.WithField("cluster", cluster.Name).Info("matched cluster secret")
}
return res, nil
}
func appendTemplatedValues(clusterValues map[string]string, params map[string]interface{}, appSet *argoappsetv1alpha1.ApplicationSet) error {
// We create a local map to ensure that we do not fall victim to a billion-laughs attack. We iterate through the
// cluster values map and only replace values in said map if it has already been whitelisted in the params map.
// Once we iterate through all the cluster values we can then safely merge the `tmp` map into the main params map.
tmp := map[string]interface{}{}
for key, value := range clusterValues {
result, err := replaceTemplatedString(value, params, appSet)
if err != nil {
return fmt.Errorf("error replacing templated String: %w", err)
}
if appSet.Spec.GoTemplate {
if tmp["values"] == nil {
tmp["values"] = map[string]string{}
}
tmp["values"].(map[string]string)[key] = result
} else {
tmp[fmt.Sprintf("values.%s", key)] = result
}
}
for key, value := range tmp {
params[key] = value
}
return nil
}
func replaceTemplatedString(value string, params map[string]interface{}, appSet *argoappsetv1alpha1.ApplicationSet) (string, error) {
replacedTmplStr, err := render.Replace(value, params, appSet.Spec.GoTemplate)
if err != nil {
return "", err
}
return replacedTmplStr, nil
}
func (g *ClusterGenerator) getSecretsByClusterName(appSetGenerator *argoappsetv1alpha1.ApplicationSetGenerator) (map[string]corev1.Secret, error) {
// List all Clusters:
clusterSecretList := &corev1.SecretList{}
selector := metav1.AddLabelToSelector(&appSetGenerator.Clusters.Selector, ArgoCDSecretTypeLabel, ArgoCDSecretTypeCluster)
secretSelector, err := metav1.LabelSelectorAsSelector(selector)
if err != nil {
return nil, err
}
if err := g.Client.List(context.Background(), clusterSecretList, client.MatchingLabelsSelector{Selector: secretSelector}); err != nil {
return nil, err
}
log.Debug("clusters matching labels", "count", len(clusterSecretList.Items))
res := map[string]corev1.Secret{}
for _, cluster := range clusterSecretList.Items {
clusterName := string(cluster.Data["name"])
res[clusterName] = cluster
}
return res, nil
}