/
cleaner.go
92 lines (80 loc) · 3.03 KB
/
cleaner.go
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package cleaner
import (
"context"
"log"
"time"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
cassdcapi "github.com/k8ssandra/cass-operator/operator/pkg/apis/cassandra/v1beta1"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/tools/clientcmd/api"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
managedLabel = "app.kubernetes.io/managed-by"
managedLabelValue = "Helm"
instanceLabel = "app.kubernetes.io/instance"
nameLabel = "app.kubernetes.io/name"
nameLabelValue = "k8ssandra"
releaseAnnotation = "meta.helm.sh/release-name"
)
// Agent is a cleaner utility for resources which helm pre-delete requires
type Agent struct {
Client client.Client
Namespace string
}
// New returns a new instance of cleaning agent
func New(namespace string) (*Agent, error) {
_ = api.AddToScheme(scheme.Scheme)
_ = cassdcapi.AddToScheme(scheme.Scheme)
c, err := client.New(ctrl.GetConfigOrDie(), client.Options{Scheme: scheme.Scheme})
if err != nil {
log.Fatal(err)
}
return &Agent{
Client: c,
Namespace: namespace,
}, nil
}
// RemoveResources deletes all the resources with finalizers or which we want an operator to trigger a deletion
func (a *Agent) RemoveResources(releaseName string) error {
// Remove CassandraDatacenter (cass-operator should delete all the finalizers and associated resources)
if err := a.removeCassandraDatacenter(releaseName); err != nil {
log.Fatalf("Failed to remove Cassandra cluster(s): %v", err)
return err
}
return nil
}
func (a *Agent) removeCassandraDatacenter(releaseName string) error {
log.Printf("Removing CassandraDatacenter(s) managed in release %s from namespace %s\n", releaseName, a.Namespace)
releaseLabels := client.MatchingLabels{
managedLabel: managedLabelValue,
instanceLabel: releaseName,
nameLabel: nameLabelValue,
}
list := &cassdcapi.CassandraDatacenterList{}
err := a.Client.List(context.Background(), list, client.InNamespace(a.Namespace), releaseLabels)
if err != nil {
log.Fatalf("Failed to list CassandraDatacenters in namespace: %s", a.Namespace)
return err
}
for _, cassdc := range list.Items {
if err = a.Client.Delete(context.Background(), &cassdc); err != nil && !apierrors.IsNotFound(err) && !apierrors.IsResourceExpired(err) {
log.Fatalf("failed to delete CassandraDatacenter %s: %s",
types.NamespacedName{Namespace: cassdc.Namespace, Name: cassdc.Name}, err)
}
}
// We need to wait until the CassandraDatacenter is terminated; otherwise, cass-operator could get
// deleted before it has a chance to clear the CassandraDatacenter's finalizer.
return wait.PollImmediate(10*time.Second, 10*time.Minute, func() (bool, error) {
list := &cassdcapi.CassandraDatacenterList{}
err := a.Client.List(context.Background(), list, client.InNamespace(a.Namespace), releaseLabels)
if err != nil {
log.Printf("failed to list CassandraDatacenters: %s\n", err)
return false, err
}
return len(list.Items) == 0, nil
})
}