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Merge pull request #68 from vshn/delete-operation
Add instance deletion
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| package standalone | ||
|
|
||
| import ( | ||
| "context" | ||
| pipeline "github.com/ccremer/go-command-pipeline" | ||
| helmv1beta1 "github.com/crossplane-contrib/provider-helm/apis/release/v1beta1" | ||
| "github.com/vshn/appcat-service-postgresql/apis/postgresql/v1alpha1" | ||
| corev1 "k8s.io/api/core/v1" | ||
| apierrors "k8s.io/apimachinery/pkg/api/errors" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/controller-runtime/pkg/controller/controllerutil" | ||
| ) | ||
|
|
||
| // DeleteStandalonePipeline is a pipeline that deletes an instance from the target deployment namespace. | ||
| type DeleteStandalonePipeline struct { | ||
| client client.Client | ||
| instance *v1alpha1.PostgresqlStandalone | ||
| helmReleaseDeleted bool | ||
| } | ||
|
|
||
| // NewDeleteStandalonePipeline creates a new delete pipeline with the required dependencies. | ||
| func NewDeleteStandalonePipeline(client client.Client, instance *v1alpha1.PostgresqlStandalone) *DeleteStandalonePipeline { | ||
| return &DeleteStandalonePipeline{ | ||
| instance: instance, | ||
| client: client, | ||
| } | ||
| } | ||
|
|
||
| // RunPipeline executes the pipeline with configured business logic steps. | ||
| // The pipeline requires multiple reconciliations due to asynchronous deletion of resources in background | ||
| // The Helm Release step requires a complete removal of its resources before moving to the next step | ||
| func (d *DeleteStandalonePipeline) RunPipeline(ctx context.Context) error { | ||
| return pipeline.NewPipeline(). | ||
| WithSteps( | ||
| pipeline.NewStepFromFunc("delete connection secret", d.deleteConnectionSecret), | ||
| pipeline.NewStepFromFunc("delete helm release", d.deleteHelmRelease), | ||
| pipeline.If(d.isHelmReleaseDeleted, | ||
| pipeline.NewPipeline().WithNestedSteps("finalize", | ||
| pipeline.NewStepFromFunc("delete namespace", d.deleteNamespace), | ||
| pipeline.NewStepFromFunc("remove finalizer", d.removeFinalizer), | ||
| ), | ||
| ), | ||
| ). | ||
| RunWithContext(ctx).Err() | ||
| } | ||
|
|
||
| // deleteHelmRelease removes the Helm Release from the cluster | ||
| // We may reconcile multiple times until Release is completely deleted hence we use helmReleaseDeleted variable | ||
| func (d *DeleteStandalonePipeline) deleteHelmRelease(ctx context.Context) error { | ||
| helmRelease := &helmv1beta1.Release{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: d.instance.Status.HelmChart.DeploymentNamespace, | ||
| }, | ||
| } | ||
| err := d.client.Delete(ctx, helmRelease) | ||
| if err != nil && apierrors.IsNotFound(err) { | ||
| d.helmReleaseDeleted = true | ||
| } | ||
| return client.IgnoreNotFound(err) | ||
| } | ||
|
|
||
| // deleteNamespace removes the namespace of the PostgreSQL instance | ||
| // We delete the namespace only if the Helm Release has been deleted | ||
| func (d *DeleteStandalonePipeline) deleteNamespace(ctx context.Context) error { | ||
| deploymentNamespace := &corev1.Namespace{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: d.instance.Status.HelmChart.DeploymentNamespace, | ||
| }, | ||
| } | ||
| propagation := metav1.DeletePropagationBackground | ||
| deleteOptions := &client.DeleteOptions{ | ||
| PropagationPolicy: &propagation, | ||
| } | ||
| return client.IgnoreNotFound(d.client.Delete(ctx, deploymentNamespace, deleteOptions)) | ||
| } | ||
|
|
||
| // deleteConnectionSecret removes the connection secret of the PostgreSQL instance | ||
| func (d *DeleteStandalonePipeline) deleteConnectionSecret(ctx context.Context) error { | ||
| connectionSecret := &corev1.Secret{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: d.instance.Spec.WriteConnectionSecretToRef.Name, | ||
| Namespace: d.instance.Namespace, | ||
| }, | ||
| } | ||
| return client.IgnoreNotFound(d.client.Delete(ctx, connectionSecret)) | ||
| } | ||
|
|
||
| // removeFinalizer removes the finalizer from the PostgreSQL CRD | ||
| func (d *DeleteStandalonePipeline) removeFinalizer(ctx context.Context) error { | ||
| if controllerutil.RemoveFinalizer(d.instance, finalizer) { | ||
| return d.client.Update(ctx, d.instance) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // isHelmReleaseDeleted checks whether the Release was completely deleted | ||
| func (d *DeleteStandalonePipeline) isHelmReleaseDeleted(_ context.Context) bool { | ||
| return d.helmReleaseDeleted | ||
| } |
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