/
statefulset.go
139 lines (123 loc) · 4.18 KB
/
statefulset.go
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// Copyright 2020 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package resources
import (
"context"
"fmt"
"time"
"github.com/juju/errors"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
types "k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/kubernetes"
k8sconstants "github.com/juju/juju/caas/kubernetes/provider/constants"
"github.com/juju/juju/core/status"
)
// StatefulSet extends the k8s statefulSet.
type StatefulSet struct {
appsv1.StatefulSet
}
// NewStatefulSet creates a new statefulset resource.
func NewStatefulSet(name string, namespace string, in *appsv1.StatefulSet) *StatefulSet {
if in == nil {
in = &appsv1.StatefulSet{}
}
in.SetName(name)
in.SetNamespace(namespace)
return &StatefulSet{*in}
}
// Clone returns a copy of the resource.
func (ss *StatefulSet) Clone() Resource {
clone := *ss
return &clone
}
// ID returns a comparable ID for the Resource
func (ss *StatefulSet) ID() ID {
return ID{"StatefulSet", ss.Name, ss.Namespace}
}
// Apply patches the resource change.
func (ss *StatefulSet) Apply(ctx context.Context, client kubernetes.Interface) (err error) {
api := client.AppsV1().StatefulSets(ss.Namespace)
var result *appsv1.StatefulSet
defer func() {
if result != nil {
ss.StatefulSet = *result
}
}()
existing, err := api.Get(ctx, ss.Name, metav1.GetOptions{})
if k8serrors.IsNotFound(err) {
result, err = api.Create(ctx, &ss.StatefulSet, metav1.CreateOptions{
FieldManager: JujuFieldManager,
})
return errors.Trace(err)
}
if err != nil {
return errors.Trace(err)
}
// Statefulset only allows updates to the following fields under ".Spec":
// 'replicas', 'template', 'updateStrategy', 'persistentVolumeClaimRetentionPolicy' and 'minReadySeconds'.
existing.SetAnnotations(ss.GetAnnotations())
existing.Spec.Replicas = ss.Spec.Replicas
existing.Spec.UpdateStrategy = ss.Spec.UpdateStrategy
existing.Spec.PersistentVolumeClaimRetentionPolicy = ss.Spec.PersistentVolumeClaimRetentionPolicy
existing.Spec.MinReadySeconds = ss.Spec.MinReadySeconds
existing.Spec.Template = ss.Spec.Template
data, err := runtime.Encode(unstructured.UnstructuredJSONScheme, existing)
if err != nil {
return errors.Trace(err)
}
result, err = api.Patch(ctx, ss.Name, types.StrategicMergePatchType, data, metav1.PatchOptions{
FieldManager: JujuFieldManager,
})
if k8serrors.IsNotFound(err) {
// This should never happen.
return errors.NewNotFound(err, fmt.Sprintf("statefulset %q", ss.Name))
}
if k8serrors.IsConflict(err) {
return errors.Annotatef(errConflict, "statefulset %q", ss.Name)
}
return errors.Trace(err)
}
// Get refreshes the resource.
func (ss *StatefulSet) Get(ctx context.Context, client kubernetes.Interface) error {
api := client.AppsV1().StatefulSets(ss.Namespace)
res, err := api.Get(ctx, ss.Name, metav1.GetOptions{})
if k8serrors.IsNotFound(err) {
return errors.NewNotFound(err, "k8s")
} else if err != nil {
return errors.Trace(err)
}
ss.StatefulSet = *res
return nil
}
// Delete removes the resource.
func (ss *StatefulSet) Delete(ctx context.Context, client kubernetes.Interface) error {
api := client.AppsV1().StatefulSets(ss.Namespace)
err := api.Delete(ctx, ss.Name, metav1.DeleteOptions{
PropagationPolicy: k8sconstants.DefaultPropagationPolicy(),
})
if k8serrors.IsNotFound(err) {
return nil
} else if err != nil {
return errors.Trace(err)
}
return nil
}
// Events emitted by the resource.
func (ss *StatefulSet) Events(ctx context.Context, client kubernetes.Interface) ([]corev1.Event, error) {
return ListEventsForObject(ctx, client, ss.Namespace, ss.Name, "StatefulSet")
}
// ComputeStatus returns a juju status for the resource.
func (ss *StatefulSet) ComputeStatus(ctx context.Context, client kubernetes.Interface, now time.Time) (string, status.Status, time.Time, error) {
if ss.DeletionTimestamp != nil {
return "", status.Terminated, ss.DeletionTimestamp.Time, nil
}
if ss.Status.ReadyReplicas == ss.Status.Replicas {
return "", status.Active, now, nil
}
return "", status.Waiting, now, nil
}