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rs.go
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rs.go
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package dao
import (
"errors"
"fmt"
"strconv"
"strings"
"github.com/derailed/k9s/internal/client"
appsv1 "k8s.io/api/apps/v1"
v1 "k8s.io/api/apps/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
cmdutil "k8s.io/kubectl/pkg/cmd/util"
"k8s.io/kubectl/pkg/polymorphichelpers"
)
// ReplicaSet represents a replicaset K8s resource.
type ReplicaSet struct {
Resource
}
// Load returns a given instance.
func (r *ReplicaSet) Load(f Factory, path string) (*v1.ReplicaSet, error) {
o, err := f.Get("apps/v1/replicasets", path, true, labels.Everything())
if err != nil {
return nil, err
}
var rs appsv1.ReplicaSet
err = runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &rs)
if err != nil {
return nil, err
}
return &rs, nil
}
func getRSRevision(rs *v1.ReplicaSet) (int64, error) {
revision := rs.ObjectMeta.Annotations["deployment.kubernetes.io/revision"]
if rs.Status.Replicas != 0 {
return 0, errors.New("can not rollback current replica")
}
vers, err := strconv.Atoi(revision)
if err != nil {
return 0, errors.New("revision conversion failed")
}
return int64(vers), nil
}
func controllerInfo(rs *v1.ReplicaSet) (string, string, string, error) {
for _, ref := range rs.ObjectMeta.OwnerReferences {
if ref.Controller == nil {
continue
}
group, tokens := ref.APIVersion, strings.Split(ref.APIVersion, "/")
if len(tokens) == 2 {
group = tokens[0]
}
return ref.Name, ref.Kind, group, nil
}
return "", "", "", fmt.Errorf("Unable to find controller for ReplicaSet %s", rs.ObjectMeta.Name)
}
// Rollback reverses the last deployment.
func (r *ReplicaSet) Rollback(fqn string) error {
rs, err := r.Load(r.Factory, fqn)
if err != nil {
return err
}
version, err := getRSRevision(rs)
if err != nil {
return err
}
name, kind, apiGroup, err := controllerInfo(rs)
if err != nil {
return err
}
dial, err := r.Client().Dial()
if err != nil {
return err
}
rb, err := polymorphichelpers.RollbackerFor(schema.GroupKind{
Group: apiGroup,
Kind: kind,
},
dial,
)
if err != nil {
return err
}
var ddp Deployment
dp, err := ddp.Load(r.Factory, client.FQN(rs.Namespace, name))
if err != nil {
return err
}
_, err = rb.Rollback(dp, map[string]string{}, version, cmdutil.DryRunNone)
if err != nil {
return err
}
return nil
}