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disco.go
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disco.go
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package kubernetesapply
import (
"context"
"fmt"
"time"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"github.com/tilt-dev/tilt/internal/controllers/apicmp"
"github.com/tilt-dev/tilt/internal/k8s"
"github.com/tilt-dev/tilt/pkg/apis/core/v1alpha1"
)
// Each KubernetesApply object owns a KubernetesDiscovery object of the same name.
//
// After we reconcile a KubernetesApply, update the KubernetesDiscovery objects it owns.
//
// If the Apply has been deleted, any corresponding Disco objects should be deleted.
func (r *Reconciler) manageOwnedKubernetesDiscovery(ctx context.Context, nn types.NamespacedName, ka *v1alpha1.KubernetesApply) (reconcile.Result, error) {
if ka != nil && (ka.Status.Error != "" || ka.Status.ResultYAML == "") {
isDisabled := ka.Status.DisableStatus != nil &&
ka.Status.DisableStatus.State == v1alpha1.DisableStateDisabled
if !isDisabled {
// If the KubernetesApply is in an error state or hasn't deployed anything,
// don't reconcile the discovery object. This prevents the reconcilers from
// tearing down all the discovery infra on a transient deploy error.
return reconcile.Result{}, nil
}
}
var existingKD v1alpha1.KubernetesDiscovery
err := r.ctrlClient.Get(ctx, nn, &existingKD)
isNotFound := apierrors.IsNotFound(err)
if err != nil && !isNotFound {
return reconcile.Result{},
fmt.Errorf("failed to fetch managed KubernetesDiscovery objects for KubernetesApply %s: %v",
nn.Name, err)
}
kd, err := r.toDesiredKubernetesDiscovery(ka)
if err != nil {
return reconcile.Result{}, fmt.Errorf("generating kubernetesdiscovery: %v", err)
}
if isNotFound {
if kd == nil {
return reconcile.Result{}, nil // Nothing to do.
}
err := r.ctrlClient.Create(ctx, kd)
if err != nil {
if apierrors.IsAlreadyExists(err) {
return reconcile.Result{RequeueAfter: time.Second}, nil
}
return reconcile.Result{}, fmt.Errorf("creating kubernetesdiscovery: %v", err)
}
return reconcile.Result{}, nil
}
if kd == nil {
err := r.ctrlClient.Delete(ctx, &existingKD)
if err != nil && !apierrors.IsNotFound(err) {
return reconcile.Result{}, fmt.Errorf("deleting kubernetesdiscovery: %v", err)
}
return reconcile.Result{}, nil
}
if !apicmp.DeepEqual(existingKD.Spec, kd.Spec) {
existingKD.Spec = kd.Spec
err = r.ctrlClient.Update(ctx, &existingKD)
if err != nil {
if apierrors.IsConflict(err) {
return reconcile.Result{RequeueAfter: time.Second}, nil
}
return reconcile.Result{}, fmt.Errorf("updating kubernetesdiscovery: %v", err)
}
}
return reconcile.Result{}, nil
}
// Construct the desired KubernetesDiscovery
func (r *Reconciler) toDesiredKubernetesDiscovery(ka *v1alpha1.KubernetesApply) (*v1alpha1.KubernetesDiscovery, error) {
if ka == nil {
return nil, nil
}
if ka.Status.DisableStatus != nil && ka.Status.DisableStatus.State == v1alpha1.DisableStateDisabled {
return nil, nil
}
watchRefs, err := r.toWatchRefs(ka)
if err != nil {
return nil, err
}
if len(watchRefs) == 0 {
return nil, nil
}
kapp := ka.Spec
var extraSelectors []metav1.LabelSelector
if kapp.KubernetesDiscoveryTemplateSpec != nil {
extraSelectors = kapp.KubernetesDiscoveryTemplateSpec.ExtraSelectors
}
kd := &v1alpha1.KubernetesDiscovery{
ObjectMeta: metav1.ObjectMeta{
Name: ka.Name,
Annotations: map[string]string{
v1alpha1.AnnotationManifest: ka.Annotations[v1alpha1.AnnotationManifest],
v1alpha1.AnnotationSpanID: ka.Annotations[v1alpha1.AnnotationSpanID],
},
},
Spec: v1alpha1.KubernetesDiscoverySpec{
Cluster: ka.Spec.Cluster,
Watches: watchRefs,
ExtraSelectors: extraSelectors,
PodLogStreamTemplateSpec: kapp.PodLogStreamTemplateSpec.DeepCopy(),
PortForwardTemplateSpec: kapp.PortForwardTemplateSpec.DeepCopy(),
},
}
err = controllerutil.SetControllerReference(ka, kd, r.ctrlClient.Scheme())
if err != nil {
return nil, err
}
return kd, nil
}
// Based on the deployed UIDs, create the list of resources to watch.
//
// TODO(nick): This currently does a lot of YAML parsing, just to get a few small
// metadata fields. We should be able to do better here if it becomes a problem, by either
// 1) optimizing the parsing, or
// 2) memoizing the Apply -> Discovery function
func (r *Reconciler) toWatchRefs(ka *v1alpha1.KubernetesApply) ([]v1alpha1.KubernetesWatchRef, error) {
seenNamespaces := make(map[k8s.Namespace]bool)
var result []v1alpha1.KubernetesWatchRef
if ka.Status.ResultYAML != "" && ka.Spec.DiscoveryStrategy != v1alpha1.KubernetesDiscoveryStrategySelectorsOnly {
deployed, err := k8s.ParseYAMLFromString(ka.Status.ResultYAML)
if err != nil {
return nil, err
}
deployedRefs := k8s.ToRefList(deployed)
for _, ref := range deployedRefs {
ns := k8s.Namespace(ref.Namespace)
if ns == "" {
// since this entity is actually deployed, don't fallback to cfgNS
ns = k8s.DefaultNamespace
}
seenNamespaces[ns] = true
result = append(result, v1alpha1.KubernetesWatchRef{
UID: string(ref.UID),
Namespace: ns.String(),
Name: ref.Name,
})
}
}
yaml := ka.Spec.YAML
if yaml == "" {
// for KAs with ApplyCmds, there is no YAML in the Spec, so get it from the Status instead.
// We still prefer Spec YAML when available:
// 1. Using the spec YAML allows us to start connecting to pods before the image build starts.
// 2. If a deployment error clears the Status YAML, we'd lose all the watchers.
yaml = ka.Status.ResultYAML
}
entities, err := k8s.ParseYAMLFromString(yaml)
if err != nil {
return nil, err
}
for _, e := range entities {
ns := k8s.Namespace(e.Meta().GetNamespace())
if ns == "" {
apiConfig := r.k8sClient.APIConfig()
context, ok := apiConfig.Contexts[apiConfig.CurrentContext]
if ok && context.Namespace != "" {
ns = k8s.Namespace(context.Namespace)
}
}
if ns == "" {
ns = k8s.DefaultNamespace
}
if !seenNamespaces[ns] {
seenNamespaces[ns] = true
result = append(result, v1alpha1.KubernetesWatchRef{
Namespace: ns.String(),
})
}
}
return result, nil
}