NodeRef controller

Signed-off-by: Vince Prignano <[email protected]>

config/rbac/rbac_role.yaml

@@ -16,6 +16,15 @@ rules:
   - update
   - patch
   - delete
+- apiGroups:
+  - ""
+  resources:
+  - events
+  verbs:
+  - get
+  - list
+  - watch
+  - create
 - apiGroups:
   - cluster.k8s.io
   resources:
@@ -94,9 +103,8 @@ rules:
 - apiGroups:
   - ""
   resources:
-  - events
+  - secrets
   verbs:
   - get
   - list
   - watch
-  - create

pkg/controller/BUILD.bazel

@@ -6,6 +6,7 @@ go_library(
         "add_machinedeployment.go",
         "add_machineset.go",
         "add_node.go",
+        "add_noderef.go",
         "controller.go",
     ],
     importpath = "sigs.k8s.io/cluster-api/pkg/controller",
@@ -14,6 +15,7 @@ go_library(
         "//pkg/controller/machinedeployment:go_default_library",
         "//pkg/controller/machineset:go_default_library",
         "//pkg/controller/node:go_default_library",
+        "//pkg/controller/noderef:go_default_library",
         "//vendor/sigs.k8s.io/controller-runtime/pkg/manager:go_default_library",
     ],
 )

pkg/controller/add_noderef.go

@@ -0,0 +1,26 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"sigs.k8s.io/cluster-api/pkg/controller/noderef"
+)
+
+func init() {
+	// AddToManagerFuncs is a list of functions to create controllers and add them to a manager.
+	AddToManagerFuncs = append(AddToManagerFuncs, noderef.Add)
+}

pkg/controller/noderef/BUILD.bazel

@@ -0,0 +1,51 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["noderef_controller.go"],
+    importpath = "sigs.k8s.io/cluster-api/pkg/controller/noderef",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//pkg/apis/cluster/v1alpha1:go_default_library",
+        "//pkg/controller/noderefutil:go_default_library",
+        "//pkg/controller/remote:go_default_library",
+        "//vendor/github.com/pkg/errors:go_default_library",
+        "//vendor/k8s.io/api/core/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/api/errors:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/runtime:go_default_library",
+        "//vendor/k8s.io/client-go/kubernetes/typed/core/v1:go_default_library",
+        "//vendor/k8s.io/client-go/tools/record:go_default_library",
+        "//vendor/k8s.io/klog:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/client:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/controller:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/handler:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/manager:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/reconcile:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/source:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = [
+        "noderef_controller_suite_test.go",
+        "noderef_controller_test.go",
+    ],
+    embed = [":go_default_library"],
+    deps = [
+        "//pkg/apis:go_default_library",
+        "//pkg/apis/cluster/v1alpha1:go_default_library",
+        "//vendor/github.com/onsi/gomega:go_default_library",
+        "//vendor/golang.org/x/net/context:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/api/errors:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/types:go_default_library",
+        "//vendor/k8s.io/client-go/kubernetes/scheme:go_default_library",
+        "//vendor/k8s.io/client-go/rest:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/client:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/envtest:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/manager:go_default_library",
+        "//vendor/sigs.k8s.io/controller-runtime/pkg/reconcile:go_default_library",
+    ],
+)

pkg/controller/noderef/noderef_controller.go

@@ -0,0 +1,220 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package noderef
+
+import (
+	"context"
+	"time"
+
+	"github.com/pkg/errors"
+	apicorev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
+	"k8s.io/client-go/tools/record"
+	"k8s.io/klog"
+	"sigs.k8s.io/cluster-api/pkg/apis/cluster/v1alpha1"
+	"sigs.k8s.io/cluster-api/pkg/controller/noderefutil"
+	"sigs.k8s.io/cluster-api/pkg/controller/remote"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/controller"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
+	"sigs.k8s.io/controller-runtime/pkg/manager"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+	"sigs.k8s.io/controller-runtime/pkg/source"
+)
+
+// controllerName is the name of this controller
+const controllerName = "machinedeployment-controller"
+
+var (
+	ErrNodeNotFound = errors.New("cannot find node with maching ProviderID")
+)
+
+// Add creates a new NodeRef Controller and adds it to the Manager with default RBAC. The Manager will set fields on the Controller
+// and Start it when the Manager is Started.
+func Add(mgr manager.Manager) error {
+	return add(mgr, newReconciler(mgr))
+}
+
+// newReconciler returns a new reconcile.Reconciler
+func newReconciler(mgr manager.Manager) reconcile.Reconciler {
+	return &ReconcileNodeRef{Client: mgr.GetClient(), scheme: mgr.GetScheme(), recorder: mgr.GetRecorder(controllerName)}
+}
+
+// add adds a new Controller to mgr with r as the reconcile.Reconciler
+func add(mgr manager.Manager, r reconcile.Reconciler) error {
+	// Create a new controller
+	c, err := controller.New("noderef-controller", mgr, controller.Options{Reconciler: r})
+	if err != nil {
+		return err
+	}
+
+	// Watch for changes to Machines.
+	return c.Watch(&source.Kind{Type: &v1alpha1.Machine{}}, &handler.EnqueueRequestForObject{})
+}
+
+var _ reconcile.Reconciler = &ReconcileNodeRef{}
+
+// ReconcileNodeRef reconciles a Machine object.
+type ReconcileNodeRef struct {
+	client.Client
+	scheme   *runtime.Scheme
+	recorder record.EventRecorder
+}
+
+// Reconcile watches Machines.
+// +kubebuilder:rbac:groups=,resources=secrets,verbs=get;list;watch
+func (r *ReconcileNodeRef) Reconcile(request reconcile.Request) (reconcile.Result, error) {
+	klog.Infof("Reconcile request for Machine %q in namespace %q", request.Name, request.Namespace)
+	ctx := context.Background()
+
+	// Fetch the NodeRef instance
+	machine := &v1alpha1.Machine{}
+	err := r.Get(ctx, request.NamespacedName, machine)
+	if err != nil {
+		if apierrors.IsNotFound(err) {
+			klog.V(2).Infof("Machine %q in namespace %q is not found, won't reconcile", machine.Name, machine.Namespace)
+			return reconcile.Result{}, nil
+		}
+		return reconcile.Result{}, err
+	}
+
+	// Check that the Machine hasn't been deleted or in the process.
+	if !machine.DeletionTimestamp.IsZero() {
+		klog.V(2).Infof("Machine %q in namespace %q has been deleted, won't reconcile", machine.Name, machine.Namespace)
+		return reconcile.Result{}, nil
+	}
+
+	// Check that the Machine doesn't already have a NodeRef.
+	if machine.Status.NodeRef != nil {
+		klog.V(2).Infof("Machine %q in namespace %q already has a NodeRef, won't reconcile", machine.Name, machine.Namespace)
+		return reconcile.Result{}, nil
+	}
+
+	// Check that the Machine has a cluster label.
+	if machine.Labels[v1alpha1.MachineClusterLabelName] == "" {
+		klog.V(2).Infof("Machine %q in namespace %q doesn't specify %q label, won't reconcile", machine.Name, machine.Namespace,
+			v1alpha1.MachineClusterLabelName)
+		return reconcile.Result{}, nil
+	}
+
+	// Check that the Machine has a valid ProviderID.
+	if machine.Spec.ProviderID == nil || *machine.Spec.ProviderID == "" {
+		klog.Warningf("Machine %q in namespace %q doesn't have a valid ProviderID, retrying later", machine.Name, machine.Namespace)
+		return reconcile.Result{RequeueAfter: 30 * time.Second}, nil
+	}
+
+	result, err := r.reconcile(ctx, machine)
+	if err != nil {
+		klog.Errorf("Failed to assign NodeRef to Machine %q: %v", request.NamespacedName, err)
+		r.recorder.Eventf(machine, apicorev1.EventTypeWarning, "NodeRefReconcileError", "%v", err)
+		return result, err
+	}
+
+	klog.Infof("Set Machine's (%q in namespace %q) NodeRef to %q", machine.Name, machine.Namespace, machine.Status.NodeRef.Name)
+	return result, nil
+}
+
+func (r ReconcileNodeRef) reconcile(ctx context.Context, machine *v1alpha1.Machine) (reconcile.Result, error) {
+	providerID, err := noderefutil.NewProviderID(*machine.Spec.ProviderID)
+	if err != nil {
+		return reconcile.Result{}, err
+	}
+
+	cluster, err := r.getCluster(ctx, machine)
+	if err != nil {
+		return reconcile.Result{}, err
+	}
+
+	clusterClient, err := remote.NewClusterClient(r.Client, cluster)
+	if err != nil {
+		return reconcile.Result{}, err
+	}
+
+	corev1Client, err := clusterClient.CoreV1()
+	if err != nil {
+		return reconcile.Result{}, err
+	}
+
+	// Get the Node reference.
+	nodeRef, err := r.getNodeReference(corev1Client, providerID)
+	if err != nil {
+		if err == ErrNodeNotFound {
+			klog.Warningf("Cannot find a matching Node for Machine %q in namespace %q, retrying later", machine.Name, machine.Namespace)
+			return reconcile.Result{RequeueAfter: 10 * time.Second}, nil
+		}
+		return reconcile.Result{}, err
+	}
+
+	// Update Machine.
+	machine.Status.NodeRef = nodeRef
+	if err := r.Client.Status().Update(ctx, machine); err != nil {
+		return reconcile.Result{}, err
+	}
+
+	return reconcile.Result{}, nil
+}
+
+func (r *ReconcileNodeRef) getCluster(ctx context.Context, machine *v1alpha1.Machine) (*v1alpha1.Cluster, error) {
+	cluster := &v1alpha1.Cluster{}
+	key := client.ObjectKey{
+		Namespace: machine.Namespace,
+		Name:      machine.Labels[v1alpha1.MachineClusterLabelName],
+	}
+
+	if err := r.Client.Get(ctx, key, cluster); err != nil {
+		return nil, err
+	}
+
+	return cluster, nil
+}
+
+func (r *ReconcileNodeRef) getNodeReference(client corev1.NodesGetter, providerID *noderefutil.ProviderID) (*apicorev1.ObjectReference, error) {
+	listOpt := metav1.ListOptions{}
+
+	for {
+		nodeList, err := client.Nodes().List(listOpt)
+		if err != nil {
+			return nil, err
+		}
+
+		for _, node := range nodeList.Items {
+			nodeProviderID, err := noderefutil.NewProviderID(node.Spec.ProviderID)
+			if err != nil {
+				continue
+			}
+
+			if providerID.Equals(nodeProviderID) {
+				return &apicorev1.ObjectReference{
+					Kind:       node.Kind,
+					APIVersion: node.APIVersion,
+					Name:       node.Name,
+					UID:        node.UID,
+				}, nil
+			}
+		}
+
+		listOpt.Continue = nodeList.Continue
+		if listOpt.Continue == "" {
+			break
+		}
+	}
+
+	return nil, ErrNodeNotFound
+}