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controller.go
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controller.go
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package cluster
import (
"context"
"fmt"
"strings"
"github.com/rancher/norman/types/convert"
v1 "github.com/rancher/rancher-operator/pkg/apis/rancher.cattle.io/v1"
"github.com/rancher/rancher-operator/pkg/clients"
mgmtcontrollers "github.com/rancher/rancher-operator/pkg/generated/controllers/management.cattle.io/v3"
rocontrollers "github.com/rancher/rancher-operator/pkg/generated/controllers/rancher.cattle.io/v1"
"github.com/rancher/rancher-operator/pkg/settings"
v3 "github.com/rancher/rancher/pkg/apis/management.cattle.io/v3"
"github.com/rancher/wrangler/pkg/condition"
appcontroller "github.com/rancher/wrangler/pkg/generated/controllers/apps/v1"
corecontrollers "github.com/rancher/wrangler/pkg/generated/controllers/core/v1"
"github.com/rancher/wrangler/pkg/generic"
"github.com/rancher/wrangler/pkg/kstatus"
"github.com/rancher/wrangler/pkg/name"
"github.com/rancher/wrangler/pkg/relatedresource"
corev1 "k8s.io/api/core/v1"
apierror "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
)
const (
byPrincipal = "by-principal"
byAgentUser = "by-agent-user"
byCluster = "by-cluster"
systemNamespace = "cattle-system"
)
type handler struct {
rclusterCache mgmtcontrollers.ClusterCache
rclusters mgmtcontrollers.ClusterClient
deploymentCache appcontroller.DeploymentCache
daemonsetCache appcontroller.DaemonSetCache
clusterTokenCache mgmtcontrollers.ClusterRegistrationTokenCache
clusterTokens mgmtcontrollers.ClusterRegistrationTokenClient
clusters rocontrollers.ClusterController
tokenCache mgmtcontrollers.TokenCache
userCache mgmtcontrollers.UserCache
secretCache corecontrollers.SecretCache
settings mgmtcontrollers.SettingCache
}
func Register(
ctx context.Context,
clients *clients.Clients) {
h := handler{
rclusterCache: clients.Management.Cluster().Cache(),
rclusters: clients.Management.Cluster(),
daemonsetCache: clients.Apps.DaemonSet().Cache(),
deploymentCache: clients.Apps.Deployment().Cache(),
clusterTokenCache: clients.Management.ClusterRegistrationToken().Cache(),
clusterTokens: clients.Management.ClusterRegistrationToken(),
clusters: clients.Cluster(),
tokenCache: clients.Management.Token().Cache(),
userCache: clients.Management.User().Cache(),
secretCache: clients.Core.Secret().Cache(),
settings: clients.Management.Setting().Cache(),
}
clients.Cluster().OnChange(ctx, "cluster-update", h.onChange)
rocontrollers.RegisterClusterGeneratingHandler(ctx,
clients.Cluster(),
clients.Apply.WithCacheTypes(clients.Management.Cluster(),
clients.Core.Secret()),
"Created",
"cluster-create",
h.generateCluster,
&generic.GeneratingHandlerOptions{
AllowClusterScoped: true,
},
)
clusterCache := clients.Cluster().Cache()
relatedresource.Watch(ctx, "cluster-watch", func(namespace, name string, obj runtime.Object) ([]relatedresource.Key, error) {
cluster, ok := obj.(*v3.Cluster)
if !ok {
return nil, nil
}
operatorClusters, err := clusterCache.GetByIndex(byCluster, cluster.Name)
if err != nil || len(operatorClusters) == 0 {
// ignore
return nil, nil
}
return []relatedresource.Key{
{
Namespace: operatorClusters[0].Namespace,
Name: operatorClusters[0].Name,
},
}, nil
}, clients.Cluster(), clients.Management.Cluster())
clusterCache.AddIndexer(byCluster, func(obj *v1.Cluster) ([]string, error) {
if obj.Status.ClusterName == "" {
return nil, nil
}
return []string{obj.Status.ClusterName}, nil
})
h.userCache.AddIndexer(byPrincipal, func(obj *v3.User) ([]string, error) {
return obj.PrincipalIDs, nil
})
h.tokenCache.AddIndexer(byAgentUser, func(obj *v3.Token) ([]string, error) {
if obj.Labels["authn.management.cattle.io/kind"] != "agent" {
return nil, nil
}
return []string{obj.UserID}, nil
})
}
func (h *handler) onChange(key string, cluster *v1.Cluster) (*v1.Cluster, error) {
if cluster == nil {
return cluster, nil
}
if cluster.Spec.ControlPlaneEndpoint == nil {
// just set to something, this doesn't really make sense to me
cluster = cluster.DeepCopy()
cluster.Spec.ControlPlaneEndpoint = &v1.Endpoint{
Host: "localhost",
Port: 6443,
}
return h.clusters.Update(cluster)
}
return cluster, nil
}
func (h *handler) generateCluster(cluster *v1.Cluster, status v1.ClusterStatus) ([]runtime.Object, v1.ClusterStatus, error) {
switch {
case cluster.Spec.ImportedConfig != nil:
return h.importCluster(cluster, status, v3.ClusterSpec{
ImportedConfig: &v3.ImportedConfig{},
})
case cluster.Spec.ReferencedConfig != nil:
return h.referenceCluster(cluster, status)
case cluster.Spec.RancherKubernetesEngineConfig != nil:
return h.createCluster(cluster, status, v3.ClusterSpec{
ClusterSpecBase: v3.ClusterSpecBase{
RancherKubernetesEngineConfig: cluster.Spec.RancherKubernetesEngineConfig,
LocalClusterAuthEndpoint: cluster.Spec.LocalClusterAuthEndpoint,
},
})
case cluster.Spec.EKSConfig != nil:
return h.createCluster(cluster, status, v3.ClusterSpec{
EKSConfig: cluster.Spec.EKSConfig,
})
case cluster.Spec.K3SConfig != nil:
return h.createCluster(cluster, status, v3.ClusterSpec{
K3sConfig: cluster.Spec.K3SConfig,
})
case cluster.Spec.RKE2Config != nil:
return h.createCluster(cluster, status, v3.ClusterSpec{
Rke2Config: cluster.Spec.RKE2Config,
})
default:
return nil, status, nil
}
}
func (h *handler) createCluster(cluster *v1.Cluster, status v1.ClusterStatus, spec v3.ClusterSpec) ([]runtime.Object, v1.ClusterStatus, error) {
spec.DisplayName = cluster.Name
spec.Description = cluster.Annotations["field.cattle.io/description"]
spec.FleetWorkspaceName = cluster.Namespace
newCluster := &v3.Cluster{
ObjectMeta: metav1.ObjectMeta{
Name: name.SafeConcatName("c", cluster.Namespace, cluster.Name),
Labels: cluster.Labels,
Annotations: cluster.Annotations,
},
Spec: spec,
}
// We do this so that we don't clobber status because the rancher object is pretty dirty and doesn't have a status subresource
data, err := convert.EncodeToMap(newCluster)
if err != nil {
return nil, status, err
}
data = map[string]interface{}{
"metadata": data["metadata"],
"spec": data["spec"],
}
data["kind"] = "Cluster"
data["apiVersion"] = "management.cattle.io/v3"
return h.updateStatus([]runtime.Object{&unstructured.Unstructured{Object: data}}, cluster, status, newCluster)
}
func (h *handler) updateStatus(objs []runtime.Object, cluster *v1.Cluster, status v1.ClusterStatus, rCluster *v3.Cluster) ([]runtime.Object, v1.ClusterStatus, error) {
ready := false
existing, err := h.rclusterCache.Get(rCluster.Name)
if err != nil && !apierror.IsNotFound(err) {
return nil, status, err
} else if err == nil {
if condition.Cond("Ready").IsTrue(existing) {
ready = true
}
}
// Never set ready back to false because we will end up deleting the secret
status.Ready = status.Ready || ready
status.ObservedGeneration = cluster.Generation
status.ClusterName = rCluster.Name
if ready {
kstatus.SetActive(&status)
} else {
kstatus.SetTransitioning(&status, "")
}
if status.Ready {
secretName, secret, err := h.getKubeConfig(cluster, status)
if err != nil {
return nil, status, err
}
if secret != nil {
objs = append(objs, secret)
}
status.ClientSecretName = secretName
}
return objs, status, nil
}
func (h *handler) getKubeConfig(cluster *v1.Cluster, status v1.ClusterStatus) (string, *corev1.Secret, error) {
var (
name = cluster.Name + "-kubeconfig"
tokenValue = ""
)
if cluster.Spec.ImportedConfig != nil && cluster.Spec.ImportedConfig.KubeConfigSecret == name {
return name, nil, nil
}
users, err := h.userCache.GetByIndex(byPrincipal, fmt.Sprintf("system://%s", status.ClusterName))
if err != nil {
return "", nil, err
}
for _, user := range users {
tokens, err := h.tokenCache.GetByIndex(byAgentUser, user.Name)
if err != nil {
return "", nil, err
}
for _, token := range tokens {
tokenValue = fmt.Sprintf("%s:%s", token.Name, token.Token)
}
}
if tokenValue == "" {
return "", nil, fmt.Errorf("failed to find token for cluster %s", status.ClusterName)
}
serverURL, cacert, err := h.getServerURLAndCA()
if err != nil {
return "", nil, err
}
data, err := clientcmd.Write(clientcmdapi.Config{
Clusters: map[string]*clientcmdapi.Cluster{
"cluster": {
Server: fmt.Sprintf("%s/k8s/clusters/%s", serverURL, status.ClusterName),
CertificateAuthorityData: []byte(strings.TrimSpace(cacert)),
},
},
AuthInfos: map[string]*clientcmdapi.AuthInfo{
"user": {
Token: tokenValue,
},
},
Contexts: map[string]*clientcmdapi.Context{
"default": {
Cluster: "cluster",
AuthInfo: "user",
},
},
CurrentContext: "default",
})
if err != nil {
return "", nil, err
}
return name, &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Namespace: cluster.Namespace,
Name: name,
},
Data: map[string][]byte{
"value": data,
},
}, nil
}
func (h *handler) getServerURLAndCA() (string, string, error) {
serverURL, ca, err := settings.GetServerURLAndCA(h.settings)
if err != nil {
return "", "", err
}
tlsSecret, err := h.secretCache.Get(systemNamespace, "tls-rancher-internal-ca")
if err != nil {
return "", "", err
}
internalCA := string(tlsSecret.Data[corev1.TLSCertKey])
if dp, err := h.deploymentCache.Get(systemNamespace, "rancher"); err == nil && dp.Spec.Replicas != nil && *dp.Spec.Replicas != 0 {
return fmt.Sprintf("https://rancher.%s", systemNamespace), internalCA, nil
}
if _, err := h.daemonsetCache.Get(systemNamespace, "rancher"); err == nil {
return fmt.Sprintf("https://rancher.%s", systemNamespace), internalCA, nil
}
return serverURL, ca, nil
}