🌱 Minor fixes for CC+MP implementation

internal/controllers/topology/cluster/blueprint.go

@@ -80,7 +80,7 @@ func (r *Reconciler) getBlueprint(ctx context.Context, cluster *clusterv1.Cluste
 			return nil, errors.Wrapf(err, "failed to get infrastructure machine template for %s, MachineDeployment class %q", tlog.KObj{Obj: blueprint.ClusterClass}, machineDeploymentClass.Class)
 		}
 
-		// Get the bootstrap machine template.
+		// Get the bootstrap config template.
 		machineDeploymentBlueprint.BootstrapTemplate, err = r.getReference(ctx, machineDeploymentClass.Template.Bootstrap.Ref)
 		if err != nil {
 			return nil, errors.Wrapf(err, "failed to get bootstrap config template for %s, MachineDeployment class %q", tlog.KObj{Obj: blueprint.ClusterClass}, machineDeploymentClass.Class)
@@ -109,7 +109,7 @@ func (r *Reconciler) getBlueprint(ctx context.Context, cluster *clusterv1.Cluste
 			return nil, errors.Wrapf(err, "failed to get InfrastructureMachinePoolTemplate for %s, MachinePool class %q", tlog.KObj{Obj: blueprint.ClusterClass}, machinePoolClass.Class)
 		}
 
-		// Get the bootstrap config.
+		// Get the bootstrap config template.
 		machinePoolBlueprint.BootstrapTemplate, err = r.getReference(ctx, machinePoolClass.Template.Bootstrap.Ref)
 		if err != nil {
 			return nil, errors.Wrapf(err, "failed to get bootstrap config for %s, MachinePool class %q", tlog.KObj{Obj: blueprint.ClusterClass}, machinePoolClass.Class)

internal/controllers/topology/cluster/conditions.go

@@ -106,15 +106,18 @@ func (r *Reconciler) reconcileTopologyReconciledCondition(s *scope.Scope, cluste
 	}
 
 	// The topology is not considered as fully reconciled if one of the following is true:
-	// * either the Control Plane or any of the MachineDeployments are still pending to pick up the new version
+	// * either the Control Plane or any of the MachineDeployments/MachinePools are still pending to pick up the new version
 	//  (generally happens when upgrading the cluster)
-	// * when there are MachineDeployments for which the upgrade has been deferred
-	// * when new MachineDeployments are pending to be created
+	// * when there are MachineDeployments/MachinePools for which the upgrade has been deferred
+	// * when new MachineDeployments/MachinePools are pending to be created
 	//  (generally happens when upgrading the cluster)
 	if s.UpgradeTracker.ControlPlane.IsPendingUpgrade ||
 		s.UpgradeTracker.MachineDeployments.IsAnyPendingCreate() ||
 		s.UpgradeTracker.MachineDeployments.IsAnyPendingUpgrade() ||
-		s.UpgradeTracker.MachineDeployments.DeferredUpgrade() {
+		s.UpgradeTracker.MachineDeployments.DeferredUpgrade() ||
+		s.UpgradeTracker.MachinePools.IsAnyPendingCreate() ||
+		s.UpgradeTracker.MachinePools.IsAnyPendingUpgrade() ||
+		s.UpgradeTracker.MachinePools.DeferredUpgrade() {
 		msgBuilder := &strings.Builder{}
 		var reason string
 
@@ -180,6 +183,11 @@ func (r *Reconciler) reconcileTopologyReconciledCondition(s *scope.Scope, cluste
 			fmt.Fprintf(msgBuilder, " MachineDeployment(s) %s are upgrading",
 				computeNameList(s.UpgradeTracker.MachineDeployments.UpgradingNames()),
 			)
+
+		case len(s.UpgradeTracker.MachinePools.UpgradingNames()) > 0:
+			fmt.Fprintf(msgBuilder, " MachinePool(s) %s are upgrading",
+				computeNameList(s.UpgradeTracker.MachinePools.UpgradingNames()),
+			)
 		}
 
 		conditions.Set(

internal/controllers/topology/cluster/current_state.go

@@ -289,6 +289,9 @@ func (r *Reconciler) getCurrentMachinePoolState(ctx context.Context, blueprintMa
 	state := make(scope.MachinePoolsStateMap)
 
 	// List all the machine pools in the current cluster and in a managed topology.
+	// Note: This is a cached list call. We ensure in reconcile_state that the cache is up-to-date
+	// after we create/update a MachinePool and we double-check if an MP already exists before
+	// we create it.
 	mp := &expv1.MachinePoolList{}
 	err := r.Client.List(ctx, mp,
 		client.MatchingLabels{
@@ -328,7 +331,7 @@ func (r *Reconciler) getCurrentMachinePoolState(ctx context.Context, blueprintMa
 		// Gets the infraRef.
 		infraRef := &m.Spec.Template.Spec.InfrastructureRef
 		if infraRef.Name == "" {
-			return nil, fmt.Errorf("%s does not have a reference to a InfrastructureMachineTemplate", tlog.KObj{Obj: m})
+			return nil, fmt.Errorf("%s does not have a reference to a InfrastructureMachinePool", tlog.KObj{Obj: m})
 		}
 
 		// If the mpTopology exists in the Cluster, lookup the corresponding mpBluePrint and align

internal/controllers/topology/cluster/desired_state.go

@@ -84,7 +84,7 @@ func (r *Reconciler) computeDesiredState(ctx context.Context, s *scope.Scope) (*
 	if len(s.Current.MachinePools) > 0 {
 		client, err := r.Tracker.GetClient(ctx, client.ObjectKeyFromObject(s.Current.Cluster))
 		if err != nil {
-			return nil, err
+			return nil, errors.Wrap(err, "failed to check if any MachinePool is upgrading")
 		}
 		// Mark all the MachinePools that are currently upgrading.
 		mpUpgradingNames, err := s.Current.MachinePools.Upgrading(ctx, client)
@@ -438,7 +438,7 @@ func (r *Reconciler) computeControlPlaneVersion(ctx context.Context, s *scope.Sc
 				// change the UpgradeTracker accordingly, otherwise the hook call is completed and we
 				// can remove this hook from the list of pending-hooks.
 				if hookResponse.RetryAfterSeconds != 0 {
-					log.Infof("MachineDeployments upgrade to version %q are blocked by %q hook", desiredVersion, runtimecatalog.HookName(runtimehooksv1.AfterControlPlaneUpgrade))
+					log.Infof("MachineDeployments/MachinePools upgrade to version %q are blocked by %q hook", desiredVersion, runtimecatalog.HookName(runtimehooksv1.AfterControlPlaneUpgrade))
 				} else {
 					if err := hooks.MarkAsDone(ctx, r.Client, s.Current.Cluster, runtimehooksv1.AfterControlPlaneUpgrade); err != nil {
 						return "", err
@@ -464,10 +464,11 @@ func (r *Reconciler) computeControlPlaneVersion(ctx context.Context, s *scope.Sc
 	}
 
 	// If the control plane is not upgrading or scaling, we can assume the control plane is stable.
-	// However, we should also check for the MachineDeployments upgrading.
-	// If the MachineDeployments are upgrading, then do not pick up the desiredVersion yet.
-	// We will pick up the new version after the MachineDeployments finish upgrading.
-	if len(s.UpgradeTracker.MachineDeployments.UpgradingNames()) > 0 {
+	// However, we should also check for the MachineDeployments/MachinePools upgrading.
+	// If the MachineDeployments/MachinePools are upgrading, then do not pick up the desiredVersion yet.
+	// We will pick up the new version after the MachineDeployments/MachinePools finish upgrading.
+	if len(s.UpgradeTracker.MachineDeployments.UpgradingNames()) > 0 ||
+		len(s.UpgradeTracker.MachinePools.UpgradingNames()) > 0 {
 		return *currentVersion, nil
 	}
 
@@ -950,7 +951,7 @@ func computeMachinePool(_ context.Context, s *scope.Scope, machinePoolTopology c
 		template:              machinePoolBlueprint.BootstrapTemplate,
 		templateClonedFromRef: contract.ObjToRef(machinePoolBlueprint.BootstrapTemplate),
 		cluster:               s.Current.Cluster,
-		namePrefix:            bootstrapTemplateNamePrefix(s.Current.Cluster.Name, machinePoolTopology.Name),
+		namePrefix:            bootstrapConfigNamePrefix(s.Current.Cluster.Name, machinePoolTopology.Name),
 		currentObjectRef:      currentBootstrapConfigRef,
 	})
 	if err != nil {
@@ -961,11 +962,11 @@ func computeMachinePool(_ context.Context, s *scope.Scope, machinePoolTopology c
 	if bootstrapObjectLabels == nil {
 		bootstrapObjectLabels = map[string]string{}
 	}
-	// Add ClusterTopologyMachinePoolLabel to the generated Bootstrap template
+	// Add ClusterTopologyMachinePoolLabel to the generated Bootstrap config
 	bootstrapObjectLabels[clusterv1.ClusterTopologyMachinePoolNameLabel] = machinePoolTopology.Name
 	desiredMachinePool.BootstrapObject.SetLabels(bootstrapObjectLabels)
 
-	// Compute the Infrastructure ref.
+	// Compute the InfrastructureMachinePool.
 	var currentInfraMachinePoolRef *corev1.ObjectReference
 	if currentMachinePool != nil && currentMachinePool.InfrastructureMachinePoolObject != nil {
 		currentInfraMachinePoolRef = &currentMachinePool.Object.Spec.Template.Spec.InfrastructureRef
@@ -991,6 +992,11 @@ func computeMachinePool(_ context.Context, s *scope.Scope, machinePoolTopology c
 	version := computeMachinePoolVersion(s, machinePoolTopology, currentMachinePool)
 
 	// Compute values that can be set both in the MachinePoolClass and in the MachinePoolTopology
+	minReadySeconds := machinePoolClass.MinReadySeconds
+	if machinePoolTopology.MinReadySeconds != nil {
+		minReadySeconds = machinePoolTopology.MinReadySeconds
+	}
+
 	failureDomains := machinePoolClass.FailureDomains
 	if machinePoolTopology.FailureDomains != nil {
 		failureDomains = machinePoolTopology.FailureDomains
@@ -1031,8 +1037,9 @@ func computeMachinePool(_ context.Context, s *scope.Scope, machinePoolTopology c
 			Namespace: s.Current.Cluster.Namespace,
 		},
 		Spec: expv1.MachinePoolSpec{
-			ClusterName:    s.Current.Cluster.Name,
-			FailureDomains: failureDomains,
+			ClusterName:     s.Current.Cluster.Name,
+			MinReadySeconds: minReadySeconds,
+			FailureDomains:  failureDomains,
 			Template: clusterv1.MachineTemplateSpec{
 				Spec: clusterv1.MachineSpec{
 					ClusterName:             s.Current.Cluster.Name,

internal/controllers/topology/cluster/patches/patch.go

@@ -57,7 +57,7 @@ func (i PreserveFields) ApplyToHelper(opts *PatchOptions) {
 	opts.preserveFields = i
 }
 
-// patchObject overwrites spec in object with spec.template.spec of patchedTemplate,
+// patchObject overwrites spec in object with spec.template.spec of modifiedObject,
 // while preserving the configured fields.
 // For example, ControlPlane.spec will be overwritten with the patched
 // ControlPlaneTemplate.spec.template.spec but preserving spec.version and spec.replicas
@@ -66,7 +66,7 @@ func patchObject(ctx context.Context, object, modifiedObject *unstructured.Unstr
 	return patchUnstructured(ctx, object, modifiedObject, "spec.template.spec", "spec", opts...)
 }
 
-// patchTemplate overwrites spec.template.spec in template with spec.template.spec of patchedTemplate,
+// patchTemplate overwrites spec.template.spec in template with spec.template.spec of modifiedTemplate,
 // while preserving the configured fields.
 // For example, it's possible to patch BootstrapTemplate.spec.template.spec with a patched
 // BootstrapTemplate.spec.template.spec while preserving fields configured via opts.fieldsToPreserve.

internal/controllers/topology/cluster/patches/template.go

@@ -91,7 +91,7 @@ func (t *requestItemBuilder) Build() (*runtimehooksv1.GeneratePatchesRequestItem
 }
 
 // getTemplateAsUnstructured is a utility func that returns a template matching the holderKind, holderFieldPath
-// and mdTopologyName from a GeneratePatchesRequest.
+// and topologyNames from a GeneratePatchesRequest.
 func getTemplateAsUnstructured(req *runtimehooksv1.GeneratePatchesRequest, holderKind, holderFieldPath string, topologyNames requestTopologyName) (*unstructured.Unstructured, error) {
 	// Find the requestItem.
 	requestItem := getRequestItem(req, holderKind, holderFieldPath, topologyNames)
@@ -119,7 +119,7 @@ func getRequestItemByUID(req *runtimehooksv1.GeneratePatchesRequest, uid types.U
 	return nil
 }
 
-// getRequestItem is a utility func that returns a template matching the holderKind, holderFiledPath and mdTopologyName from a GeneratePatchesRequest.
+// getRequestItem is a utility func that returns a template matching the holderKind, holderFiledPath and topologyNames from a GeneratePatchesRequest.
 func getRequestItem(req *runtimehooksv1.GeneratePatchesRequest, holderKind, holderFieldPath string, topologyNames requestTopologyName) *runtimehooksv1.GeneratePatchesRequestItem {
 	for _, template := range req.Items {
 		if holderKind != "" && template.HolderReference.Kind != holderKind {

internal/controllers/topology/cluster/reconcile_state.go

@@ -250,9 +250,9 @@ func (r *Reconciler) callAfterClusterUpgrade(ctx context.Context, s *scope.Scope
 		// Call the registered extensions for the hook after the cluster is fully upgraded.
 		// A clusters is considered fully upgraded if:
 		// - Control plane is stable (not upgrading, not scaling, not about to upgrade)
-		// - MachineDeployments are not currently upgrading
-		// - MachineDeployments are not pending an upgrade
-		// - MachineDeployments are not pending create
+		// - MachineDeployments/MachinePools are not currently upgrading
+		// - MachineDeployments/MachinePools are not pending an upgrade
+		// - MachineDeployments/MachinePools are not pending create
 		if isControlPlaneStable(s) && // Control Plane stable checks
 			len(s.UpgradeTracker.MachineDeployments.UpgradingNames()) == 0 && // Machine deployments are not upgrading or not about to upgrade
 			!s.UpgradeTracker.MachineDeployments.IsAnyPendingCreate() && // No MachineDeployments are pending create
@@ -737,6 +737,10 @@ func (r *Reconciler) reconcileMachinePools(ctx context.Context, s *scope.Scope)
 
 	// Create MachinePools.
 	if len(diff.toCreate) > 0 {
+		// In current state we only got the MP list via a cached call.
+		// As a consequence, in order to prevent the creation of duplicate MP due to stale reads,
+		// we are now using a live client to double-check here that the MachinePool
+		// to be created doesn't exist yet.
 		currentMPTopologyNames, err := r.getCurrentMachinePools(ctx, s)
 		if err != nil {
 			return err
@@ -806,8 +810,6 @@ func (r *Reconciler) getCurrentMachinePools(ctx context.Context, s *scope.Scope)
 // createMachinePool creates a MachinePool and the corresponding templates.
 func (r *Reconciler) createMachinePool(ctx context.Context, s *scope.Scope, mp *scope.MachinePoolState) error {
 	// Do not create the MachinePool if it is marked as pending create.
-	// This will also block MHC creation because creating the MHC without the corresponding
-	// MachinePool is unnecessary.
 	mpTopologyName, ok := mp.Object.Labels[clusterv1.ClusterTopologyMachinePoolNameLabel]
 	if !ok || mpTopologyName == "" {
 		// Note: This is only an additional safety check and should not happen. The label will always be added when computing
@@ -868,7 +870,7 @@ func (r *Reconciler) createMachinePool(ctx context.Context, s *scope.Scope, mp *
 	return nil
 }
 
-// updateMachinePool updates a MachinePool. Also rotates the corresponding Templates if necessary.
+// updateMachinePool updates a MachinePool. Also updates the corresponding objects if necessary.
 func (r *Reconciler) updateMachinePool(ctx context.Context, s *scope.Scope, currentMP, desiredMP *scope.MachinePoolState) error {
 	log := tlog.LoggerFrom(ctx).WithMachinePool(desiredMP.Object)
 
@@ -882,20 +884,18 @@ func (r *Reconciler) updateMachinePool(ctx context.Context, s *scope.Scope, curr
 	cluster := s.Current.Cluster
 	infraCtx, _ := log.WithObject(desiredMP.InfrastructureMachinePoolObject).Into(ctx)
 	if err := r.reconcileReferencedObject(infraCtx, reconcileReferencedObjectInput{
-		cluster:       cluster,
-		current:       currentMP.InfrastructureMachinePoolObject,
-		desired:       desiredMP.InfrastructureMachinePoolObject,
-		versionGetter: contract.ControlPlane().Version().Get,
+		cluster: cluster,
+		current: currentMP.InfrastructureMachinePoolObject,
+		desired: desiredMP.InfrastructureMachinePoolObject,
 	}); err != nil {
 		return errors.Wrapf(err, "failed to reconcile %s", tlog.KObj{Obj: currentMP.Object})
 	}
 
 	bootstrapCtx, _ := log.WithObject(desiredMP.BootstrapObject).Into(ctx)
 	if err := r.reconcileReferencedObject(bootstrapCtx, reconcileReferencedObjectInput{
-		cluster:       cluster,
-		current:       currentMP.BootstrapObject,
-		desired:       desiredMP.BootstrapObject,
-		versionGetter: contract.ControlPlane().Version().Get,
+		cluster: cluster,
+		current: currentMP.BootstrapObject,
+		desired: desiredMP.BootstrapObject,
 	}); err != nil {
 		return errors.Wrapf(err, "failed to reconcile %s", tlog.KObj{Obj: currentMP.Object})
 	}

internal/controllers/topology/cluster/scope/blueprint.go

@@ -87,7 +87,7 @@ type MachinePoolBlueprint struct {
 	// BootstrapTemplate holds the bootstrap template for a MachinePool referenced from ClusterClass.
 	BootstrapTemplate *unstructured.Unstructured
 
-	// InfrastructureMachinePoolTemplate holds the infrastructure machine template for a MachinePool referenced from ClusterClass.
+	// InfrastructureMachinePoolTemplate holds the infrastructure machine pool template for a MachinePool referenced from ClusterClass.
 	InfrastructureMachinePoolTemplate *unstructured.Unstructured
 }
 

internal/controllers/topology/cluster/scope/scope_test.go

@@ -26,7 +26,7 @@ import (
 )
 
 func TestNew(t *testing.T) {
-	t.Run("should set the right maxMachineDeploymentUpgradeConcurrency in UpgradeTracker from the cluster annotation", func(t *testing.T) {
+	t.Run("should set the right maxUpgradeConcurrency in UpgradeTracker from the cluster annotation", func(t *testing.T) {
 		tests := []struct {
 			name    string
 			cluster *clusterv1.Cluster
@@ -53,7 +53,8 @@ func TestNew(t *testing.T) {
 		for _, tt := range tests {
 			g := NewWithT(t)
 			s := New(tt.cluster)
-			g.Expect(s.UpgradeTracker.MachineDeployments.maxMachineDeploymentUpgradeConcurrency).To(Equal(tt.want))
+			g.Expect(s.UpgradeTracker.MachineDeployments.maxUpgradeConcurrency).To(Equal(tt.want))
+			g.Expect(s.UpgradeTracker.MachinePools.maxUpgradeConcurrency).To(Equal(tt.want))
 		}
 	})
 }

internal/controllers/topology/cluster/scope/state.go

@@ -161,7 +161,7 @@ type MachinePoolState struct {
 }
 
 // IsUpgrading determines if the MachinePool is upgrading.
-// A machine deployment is considered upgrading if at least one of the Machines of this
+// A machine pool is considered upgrading if at least one of the Machines of this
 // MachinePool has a different version.
 func (mp *MachinePoolState) IsUpgrading(ctx context.Context, c client.Client) (bool, error) {
 	// If the MachinePool has no version there is no definitive way to check if it is upgrading. Therefore, return false.