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Merge pull request #272 from syself/feature/autoscaling-from-zero
✨ Add support for autoscaling from zero
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| /* | ||
| Copyright 2022 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 controllers | ||
|
|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| "github.com/pkg/errors" | ||
| infrav1 "github.com/syself/cluster-api-provider-hetzner/api/v1beta1" | ||
| "github.com/syself/cluster-api-provider-hetzner/pkg/scope" | ||
| secretutil "github.com/syself/cluster-api-provider-hetzner/pkg/secrets" | ||
| hcloudclient "github.com/syself/cluster-api-provider-hetzner/pkg/services/hcloud/client" | ||
| "github.com/syself/cluster-api-provider-hetzner/pkg/services/hcloud/machinetemplate" | ||
| "sigs.k8s.io/cluster-api/util" | ||
| ctrl "sigs.k8s.io/controller-runtime" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/controller-runtime/pkg/controller" | ||
| "sigs.k8s.io/controller-runtime/pkg/controller/controllerutil" | ||
| "sigs.k8s.io/controller-runtime/pkg/reconcile" | ||
| ) | ||
|
|
||
| // HCloudMachineTemplateReconciler reconciles a HCloudMachineTemplate object. | ||
| type HCloudMachineTemplateReconciler struct { | ||
| client.Client | ||
| APIReader client.Reader | ||
| HCloudClientFactory hcloudclient.Factory | ||
| WatchFilterValue string | ||
| } | ||
|
|
||
| // +kubebuilder:rbac:groups=infrastructure.cluster.x-k8s.io,resources=hcloudmachinetemplates,verbs=get;list;watch;create;update;patch;delete | ||
| // +kubebuilder:rbac:groups=infrastructure.cluster.x-k8s.io,resources=hcloudmachinetemplates/status,verbs=get;update;patch | ||
|
|
||
| // Reconcile manages the lifecycle of an HCloudMachineTemplate object. | ||
| func (r *HCloudMachineTemplateReconciler) Reconcile(ctx context.Context, req ctrl.Request) (_ ctrl.Result, reterr error) { | ||
| log := ctrl.LoggerFrom(ctx).WithValues("hcloudmachinetemplate", req.NamespacedName) | ||
| log.Info("Reconcile HCloudMachineTemplate") | ||
|
|
||
| machineTemplate := &infrav1.HCloudMachineTemplate{} | ||
| if err := r.Get(ctx, req.NamespacedName, machineTemplate); err != nil { | ||
| log.Error(err, "unable to fetch HCloudMachineTemplate") | ||
| return ctrl.Result{}, client.IgnoreNotFound(err) | ||
| } | ||
|
|
||
| // Fetch the Cluster. | ||
| cluster, err := util.GetClusterFromMetadata(ctx, r.Client, machineTemplate.ObjectMeta) | ||
| if err != nil { | ||
| log.Info("Machine is missing cluster label or cluster does not exist") | ||
| return ctrl.Result{}, nil | ||
| } | ||
|
|
||
| log = log.WithValues("cluster", cluster.Name) | ||
|
|
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| hetznerCluster := &infrav1.HetznerCluster{} | ||
|
|
||
| hetznerClusterName := client.ObjectKey{ | ||
| Namespace: machineTemplate.Namespace, | ||
| Name: cluster.Spec.InfrastructureRef.Name, | ||
| } | ||
| if err := r.Client.Get(ctx, hetznerClusterName, hetznerCluster); err != nil { | ||
| log.Info("HetznerCluster is not available yet") | ||
| return ctrl.Result{}, nil | ||
| } | ||
|
|
||
| // Create the scope. | ||
| secretManager := secretutil.NewSecretManager(log, r.Client, r.APIReader) | ||
| hcloudToken, _, err := getAndValidateHCloudToken(ctx, req.Namespace, hetznerCluster, secretManager) | ||
| if err != nil { | ||
| return hcloudTokenErrorResult(ctx, err, machineTemplate, infrav1.InstanceReadyCondition, r.Client) | ||
| } | ||
|
|
||
| hcc := r.HCloudClientFactory.NewClient(hcloudToken) | ||
|
|
||
| machineTemplateScope, err := scope.NewHCloudMachineTemplateScope(ctx, scope.HCloudMachineTemplateScopeParams{ | ||
| Client: r.Client, | ||
| Logger: &log, | ||
| HCloudMachineTemplate: machineTemplate, | ||
| HCloudClient: hcc, | ||
| }) | ||
| if err != nil { | ||
| return reconcile.Result{}, errors.Errorf("failed to create scope: %+v", err) | ||
| } | ||
|
|
||
| // Always close the scope when exiting this function so we can persist any HCloudMachine changes. | ||
| defer func() { | ||
| if err := machineTemplateScope.Close(ctx); err != nil && reterr == nil { | ||
| reterr = err | ||
| } | ||
| }() | ||
|
|
||
| // check whether rate limit has been reached and if so, then wait. | ||
| if wait := reconcileRateLimit(machineTemplate); wait { | ||
| return ctrl.Result{RequeueAfter: 30 * time.Second}, nil | ||
| } | ||
|
|
||
| return r.reconcile(ctx, machineTemplateScope) | ||
| } | ||
|
|
||
| func (r *HCloudMachineTemplateReconciler) reconcile(ctx context.Context, machineTemplateScope *scope.HCloudMachineTemplateScope) (reconcile.Result, error) { | ||
| machineTemplateScope.Info("Reconciling HCloudMachineTemplate") | ||
| hcloudMachine := machineTemplateScope.HCloudMachineTemplate | ||
|
|
||
| // If the HCloudMachineTemplate doesn't have our finalizer, add it. | ||
| controllerutil.AddFinalizer(machineTemplateScope.HCloudMachineTemplate, infrav1.MachineFinalizer) | ||
|
|
||
| // Register the finalizer immediately to avoid orphaning HCloud resources on delete | ||
| if err := machineTemplateScope.PatchObject(ctx); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
|
|
||
| // reconcile machinetemplate | ||
| if result, brk, err := breakReconcile(machinetemplate.NewService(machineTemplateScope).Reconcile(ctx)); brk { | ||
| return result, errors.Wrapf(err, "failed to reconcile machinetemplate for HCloudMachineTemplate %s/%s", hcloudMachine.Namespace, hcloudMachine.Name) | ||
| } | ||
|
|
||
| return reconcile.Result{}, nil | ||
| } | ||
|
|
||
| func (r *HCloudMachineTemplateReconciler) SetupWithManager(ctx context.Context, mgr ctrl.Manager, options controller.Options) error { | ||
| return ctrl.NewControllerManagedBy(mgr). | ||
| WithOptions(options). | ||
| For(&infrav1.HCloudMachineTemplate{}). | ||
| Complete(r) | ||
| } |
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