/
helpers.go
259 lines (230 loc) · 8.31 KB
/
helpers.go
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package controllers
import (
"context"
"fmt"
"net"
"net/url"
"strings"
etcdbootstrapv1 "github.com/aws/etcdadm-bootstrap-provider/api/v1beta1"
etcdv1 "github.com/aws/etcdadm-controller/api/v1beta1"
"github.com/pkg/errors"
"go.etcd.io/etcd/api/v3/etcdserverpb"
clientv3 "go.etcd.io/etcd/client/v3"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/selection"
"k8s.io/apiserver/pkg/storage/names"
clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
"sigs.k8s.io/cluster-api/controllers/external"
"sigs.k8s.io/cluster-api/util"
"sigs.k8s.io/cluster-api/util/patch"
ctrl "sigs.k8s.io/controller-runtime"
)
const (
httpsPrefix = "https://"
etcdClientURLPort = "2379"
)
// EtcdMachinesSelectorForCluster returns the label selector necessary to get etcd machines for a given cluster.
func EtcdMachinesSelectorForCluster(clusterName, etcdClusterName string) labels.Selector {
must := func(r *labels.Requirement, err error) labels.Requirement {
if err != nil {
panic(err)
}
return *r
}
return labels.NewSelector().Add(
must(labels.NewRequirement(clusterv1.ClusterNameLabel, selection.Equals, []string{clusterName})),
must(labels.NewRequirement(clusterv1.MachineEtcdClusterLabelName, selection.Equals, []string{etcdClusterName})),
)
}
// EtcdClusterMachines returns a filter to find all etcd machines for a cluster, regardless of ownership.
func EtcdClusterMachines(clusterName, etcdClusterName string) func(machine *clusterv1.Machine) bool {
selector := EtcdMachinesSelectorForCluster(clusterName, etcdClusterName)
return func(machine *clusterv1.Machine) bool {
if machine == nil {
return false
}
return selector.Matches(labels.Set(machine.Labels))
}
}
// ControlPlaneLabelsForCluster returns a set of labels to add to a control plane machine for this specific cluster.
func EtcdLabelsForCluster(clusterName string, etcdClusterName string) map[string]string {
return map[string]string{
clusterv1.ClusterNameLabel: clusterName,
clusterv1.MachineEtcdClusterLabelName: etcdClusterName,
}
}
func (r *EtcdadmClusterReconciler) cloneConfigsAndGenerateMachine(ctx context.Context, ec *etcdv1.EtcdadmCluster, cluster *clusterv1.Cluster, failureDomain *string) (ctrl.Result, error) {
// Since the cloned resource should eventually have a controller ref for the Machine, we create an
// OwnerReference here without the Controller field set
infraCloneOwner := &metav1.OwnerReference{
APIVersion: etcdv1.GroupVersion.String(),
Kind: "EtcdadmCluster",
Name: ec.Name,
UID: ec.UID,
}
// Clone the infrastructure template
infraRef, err := external.CreateFromTemplate(ctx, &external.CreateFromTemplateInput{
Client: r.Client,
TemplateRef: &ec.Spec.InfrastructureTemplate,
Namespace: ec.Namespace,
OwnerRef: infraCloneOwner,
ClusterName: cluster.Name,
Labels: EtcdLabelsForCluster(cluster.Name, ec.Name),
})
if err != nil {
return ctrl.Result{}, fmt.Errorf("error cloning infrastructure template for etcd machine: %v", err)
}
if infraRef == nil {
return ctrl.Result{}, fmt.Errorf("infrastructure template could not be cloned for etcd machine")
}
bootstrapRef, err := r.generateEtcdadmConfig(ctx, ec, cluster)
if err != nil {
return ctrl.Result{}, err
}
if err := r.generateMachine(ctx, ec, cluster, infraRef, bootstrapRef, failureDomain); err != nil {
r.Log.Error(err, "Failed to create initial etcd machine")
return ctrl.Result{}, err
}
return ctrl.Result{}, nil
}
func (r *EtcdadmClusterReconciler) generateEtcdadmConfig(ctx context.Context, ec *etcdv1.EtcdadmCluster, cluster *clusterv1.Cluster) (*corev1.ObjectReference, error) {
owner := metav1.OwnerReference{
APIVersion: etcdv1.GroupVersion.String(),
Kind: "EtcdadmCluster",
Name: ec.Name,
UID: ec.UID,
}
bootstrapConfig := &etcdbootstrapv1.EtcdadmConfig{
ObjectMeta: metav1.ObjectMeta{
Name: names.SimpleNameGenerator.GenerateName(ec.Name + "-"),
Namespace: ec.Namespace,
Labels: EtcdLabelsForCluster(cluster.Name, ec.Name),
OwnerReferences: []metav1.OwnerReference{owner},
},
Spec: ec.Spec.EtcdadmConfigSpec,
}
bootstrapRef := &corev1.ObjectReference{
APIVersion: etcdbootstrapv1.GroupVersion.String(),
Kind: "EtcdadmConfig",
Name: bootstrapConfig.GetName(),
Namespace: bootstrapConfig.GetNamespace(),
UID: bootstrapConfig.GetUID(),
}
if err := r.Client.Create(ctx, bootstrapConfig); err != nil {
return nil, errors.Wrap(err, "Failed to create etcdadm bootstrap configuration")
}
return bootstrapRef, nil
}
func (r *EtcdadmClusterReconciler) generateMachine(ctx context.Context, ec *etcdv1.EtcdadmCluster, cluster *clusterv1.Cluster, infraRef, bootstrapRef *corev1.ObjectReference, failureDomain *string) error {
machine := &clusterv1.Machine{
ObjectMeta: metav1.ObjectMeta{
Name: names.SimpleNameGenerator.GenerateName(ec.Name + "-"),
Namespace: ec.Namespace,
Labels: EtcdLabelsForCluster(cluster.Name, ec.Name),
OwnerReferences: []metav1.OwnerReference{
*metav1.NewControllerRef(ec, etcdv1.GroupVersion.WithKind("EtcdadmCluster")),
},
},
Spec: clusterv1.MachineSpec{
ClusterName: cluster.Name,
InfrastructureRef: *infraRef,
Bootstrap: clusterv1.Bootstrap{
ConfigRef: bootstrapRef,
},
FailureDomain: failureDomain,
},
}
if err := r.Client.Create(ctx, machine); err != nil {
return errors.Wrap(err, "failed to create machine")
}
return nil
}
func getEtcdMachineAddress(machine *clusterv1.Machine) string {
var internalIP, internalDNS, externalIP, externalDNS string
// Check and record all different address types set for the machine and return later according to precedence.
for _, address := range machine.Status.Addresses {
switch address.Type {
case clusterv1.MachineInternalIP:
internalIP = address.Address
case clusterv1.MachineInternalDNS:
internalDNS = address.Address
case clusterv1.MachineExternalIP:
externalIP = address.Address
case clusterv1.MachineExternalDNS:
externalDNS = address.Address
}
}
// The order of these checks determines the precedence of the address to use
if externalDNS != "" {
return externalDNS
} else if externalIP != "" {
return externalIP
} else if internalDNS != "" {
return internalDNS
} else if internalIP != "" {
return internalIP
}
return ""
}
func getMemberClientURL(address string) string {
return fmt.Sprintf("%s%s:%s", httpsPrefix, address, etcdClientURLPort)
}
func getEtcdMachineAddressFromClientURL(clientURL string) string {
u, err := url.ParseRequestURI(clientURL)
if err != nil {
return ""
}
host, _, err := net.SplitHostPort(u.Host)
if err != nil {
return ""
}
return host
}
func getMemberHealthCheckEndpoint(clientURL string) string {
return fmt.Sprintf("%s/health", clientURL)
}
// source: https://github.com/kubernetes-sigs/etcdadm/blob/master/etcd/etcd.go#L53:6
func memberForPeerURLs(members *clientv3.MemberListResponse, peerURLs []string) (*etcdserverpb.Member, bool) {
for _, m := range members.Members {
if stringSlicesEqual(m.PeerURLs, peerURLs) {
return m, true
}
}
return nil, false
}
// stringSlicesEqual compares two string slices for equality
func stringSlicesEqual(l, r []string) bool {
if len(l) != len(r) {
return false
}
for i := range l {
if l[i] != r[i] {
return false
}
}
return true
}
// Logic & implementation similar to KCP controller reconciling external MachineTemplate InfrastrucutureReference https://github.com/kubernetes-sigs/cluster-api/blob/master/controlplane/kubeadm/controllers/helpers.go#L123:41
func (r *EtcdadmClusterReconciler) reconcileExternalReference(ctx context.Context, cluster *clusterv1.Cluster, ref corev1.ObjectReference) error {
if !strings.HasSuffix(ref.Kind, clusterv1.TemplateSuffix) {
return nil
}
obj, err := external.Get(ctx, r.Client, &ref, cluster.Namespace)
if err != nil {
return err
}
// Note: We intentionally do not handle checking for the paused label on an external template reference
patchHelper, err := patch.NewHelper(obj, r.Client)
if err != nil {
return err
}
obj.SetOwnerReferences(util.EnsureOwnerRef(obj.GetOwnerReferences(), metav1.OwnerReference{
APIVersion: clusterv1.GroupVersion.String(),
Kind: "Cluster",
Name: cluster.Name,
UID: cluster.UID,
}))
return patchHelper.Patch(ctx, obj)
}