Extended status check for reconciliation

internal/controller/etcdcluster_controller.go

@@ -48,6 +48,7 @@ type EtcdClusterReconciler struct {
 // +kubebuilder:rbac:groups=etcd.aenix.io,resources=etcdclusters,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=etcd.aenix.io,resources=etcdclusters/status,verbs=get;update;patch
 // +kubebuilder:rbac:groups=etcd.aenix.io,resources=etcdclusters/finalizers,verbs=update
+// +kubebuilder:rbac:groups="",resources=endpoints,verbs=get;list;watch
 // +kubebuilder:rbac:groups="",resources=configmaps,verbs=get;list;watch;create;update;watch;delete;patch
 // +kubebuilder:rbac:groups="",resources=services,verbs=get;create;delete;update;patch;list;watch
 // +kubebuilder:rbac:groups="apps",resources=statefulsets,verbs=get;create;delete;update;patch;list;watch
@@ -72,6 +73,57 @@ func (r *EtcdClusterReconciler) Reconcile(ctx context.Context, req ctrl.Request)
 		return reconcile.Result{}, nil
 	}
 
+	sts := appsv1.StatefulSet{}
+	// create two services and the pdb, try fetching the sts
+	{
+		c := make(chan error)
+		go func(chan<- error) {
+			err := factory.CreateOrUpdateClientService(ctx, instance, r.Client)
+			if err != nil {
+				err = fmt.Errorf("couldn't ensure client service: %w", err)
+			}
+			c <- err
+		}(c)
+		go func(chan<- error) {
+			err := factory.CreateOrUpdateHeadlessService(ctx, instance, r.Client)
+			if err != nil {
+				err = fmt.Errorf("couldn't ensure headless service: %w", err)
+			}
+			c <- err
+		}(c)
+		go func(chan<- error) {
+			err := factory.CreateOrUpdatePdb(ctx, instance, r.Client)
+			if err != nil {
+				err = fmt.Errorf("couldn't ensure pod disruption budget: %w", err)
+			}
+			c <- err
+		}(c)
+		go func(chan<- error) {
+			err := r.Get(ctx, req.NamespacedName, &sts)
+			if client.IgnoreNotFound(err) != nil {
+				err = fmt.Errorf("couldn't get statefulset: %w", err)
+			}
+			c <- err
+		}(c)
+		for i := 0; i < 4; i++ {
+			if err := <-c; err != nil {
+				return ctrl.Result{}, err
+			}
+		}
+	}
+	/*
+		clusterClient, singleClients, err := factory.NewEtcdClientSet(ctx, instance, r.Client)
+		if err != nil {
+			return ctrl.Result{}, err
+		}
+		if clusterClient == nil || singleClients == nil {
+			// TODO: no endpoints case
+
+		}
+		if sts.UID != "" {
+			r.Patch()
+		}
+	*/
 	// fill conditions
 	if len(instance.Status.Conditions) == 0 {
 		factory.FillConditions(instance)

internal/controller/factory/etcd_client.go

@@ -0,0 +1,59 @@
+package factory
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/aenix-io/etcd-operator/api/v1alpha1"
+	clientv3 "go.etcd.io/etcd/client/v3"
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+func NewEtcdClientSet(ctx context.Context, cluster *v1alpha1.EtcdCluster, client client.Client) (*clientv3.Client, []*clientv3.Client, error) {
+	cfg, err := configFromCluster(ctx, cluster, client)
+	if err != nil {
+		return nil, nil, err
+	}
+	if len(cfg.Endpoints) == 0 {
+		return nil, nil, nil
+	}
+	eps := cfg.Endpoints
+	clusterClient, err := clientv3.New(cfg)
+	if err != nil {
+		return nil, nil, fmt.Errorf("error building etcd cluster client: %w", err)
+	}
+	singleClients := make([]*clientv3.Client, len(eps))
+	for i, ep := range eps {
+		cfg.Endpoints = []string{ep}
+		singleClients[i], err = clientv3.New(cfg)
+		if err != nil {
+			return nil, nil, fmt.Errorf("error building etcd single-endpoint client for endpoint %s: %w", ep, err)
+		}
+	}
+	return clusterClient, singleClients, nil
+}
+
+func configFromCluster(ctx context.Context, cluster *v1alpha1.EtcdCluster, client client.Client) (clientv3.Config, error) {
+	ep := v1.Endpoints{}
+	err := client.Get(ctx, types.NamespacedName{Name: GetHeadlessServiceName(cluster), Namespace: cluster.Namespace}, &ep)
+	if err != nil {
+		return clientv3.Config{}, err
+	}
+	names := map[string]struct{}{}
+	urls := make([]string, 0, 8)
+	for _, v := range ep.Subsets {
+		for _, addr := range v.Addresses {
+			names[addr.Hostname] = struct{}{}
+		}
+		for _, addr := range v.NotReadyAddresses {
+			names[addr.Hostname] = struct{}{}
+		}
+	}
+	for name := range names {
+		urls = append(urls, fmt.Sprintf("%s:%s", name, "2379"))
+	}
+
+	return clientv3.Config{Endpoints: urls}, nil
+}