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role.go
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role.go
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package v1beta1
import (
"encoding/json"
"fmt"
"github.com/appscode/kutil"
"github.com/golang/glog"
kerr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/apimachinery/pkg/util/wait"
clientset "k8s.io/client-go/kubernetes"
rbac "k8s.io/client-go/pkg/apis/rbac/v1beta1"
)
func EnsureRole(c clientset.Interface, meta metav1.ObjectMeta, transform func(*rbac.Role) *rbac.Role) (*rbac.Role, error) {
return CreateOrPatchRole(c, meta, transform)
}
func CreateOrPatchRole(c clientset.Interface, meta metav1.ObjectMeta, transform func(*rbac.Role) *rbac.Role) (*rbac.Role, error) {
cur, err := c.RbacV1beta1().Roles(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(err) {
glog.V(3).Infof("Creating Role %s/%s.", meta.Namespace, meta.Name)
return c.RbacV1beta1().Roles(meta.Namespace).Create(transform(&rbac.Role{
TypeMeta: metav1.TypeMeta{
Kind: "Role",
APIVersion: rbac.SchemeGroupVersion.Version,
},
ObjectMeta: meta,
}))
} else if err != nil {
return nil, err
}
return PatchRole(c, cur, transform)
}
func PatchRole(c clientset.Interface, cur *rbac.Role, transform func(*rbac.Role) *rbac.Role) (*rbac.Role, error) {
curJson, err := json.Marshal(cur)
if err != nil {
return nil, err
}
modJson, err := json.Marshal(transform(cur))
if err != nil {
return nil, err
}
patch, err := strategicpatch.CreateTwoWayMergePatch(curJson, modJson, rbac.Role{})
if err != nil {
return nil, err
}
if len(patch) == 0 || string(patch) == "{}" {
return cur, nil
}
glog.V(3).Infof("Patching Role %s/%s with %s.", cur.Namespace, cur.Name, string(patch))
return c.RbacV1beta1().Roles(cur.Namespace).Patch(cur.Name, types.StrategicMergePatchType, patch)
}
func TryPatchRole(c clientset.Interface, meta metav1.ObjectMeta, transform func(*rbac.Role) *rbac.Role) (result *rbac.Role, err error) {
attempt := 0
err = wait.PollImmediate(kutil.RetryInterval, kutil.RetryTimeout, func() (bool, error) {
attempt++
cur, e2 := c.RbacV1beta1().Roles(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(e2) {
return false, e2
} else if e2 == nil {
result, e2 = PatchRole(c, cur, transform)
return e2 == nil, nil
}
glog.Errorf("Attempt %d failed to patch Role %s/%s due to %v.", attempt, cur.Namespace, cur.Name, e2)
return false, nil
})
if err != nil {
err = fmt.Errorf("failed to patch Role %s/%s after %d attempts due to %v", meta.Namespace, meta.Name, attempt, err)
}
return
}
func TryUpdateRole(c clientset.Interface, meta metav1.ObjectMeta, transform func(*rbac.Role) *rbac.Role) (result *rbac.Role, err error) {
attempt := 0
err = wait.PollImmediate(kutil.RetryInterval, kutil.RetryTimeout, func() (bool, error) {
attempt++
cur, e2 := c.RbacV1beta1().Roles(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(e2) {
return false, e2
} else if e2 == nil {
result, e2 = c.RbacV1beta1().Roles(cur.Namespace).Update(transform(cur))
return e2 == nil, nil
}
glog.Errorf("Attempt %d failed to update Role %s/%s due to %v.", attempt, cur.Namespace, cur.Name, e2)
return false, nil
})
if err != nil {
err = fmt.Errorf("failed to update Role %s/%s after %d attempts due to %v", meta.Namespace, meta.Name, attempt, err)
}
return
}