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service.go
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service.go
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package v1
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"
apiv1 "k8s.io/client-go/pkg/api/v1"
)
func EnsureService(c clientset.Interface, meta metav1.ObjectMeta, transform func(*apiv1.Service) *apiv1.Service) (*apiv1.Service, error) {
return CreateOrPatchService(c, meta, transform)
}
func CreateOrPatchService(c clientset.Interface, meta metav1.ObjectMeta, transform func(*apiv1.Service) *apiv1.Service) (*apiv1.Service, error) {
cur, err := c.CoreV1().Services(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(err) {
glog.V(3).Infof("Creating Service %s/%s.", meta.Namespace, meta.Name)
return c.CoreV1().Services(meta.Namespace).Create(transform(&apiv1.Service{
TypeMeta: metav1.TypeMeta{
Kind: "Service",
APIVersion: apiv1.SchemeGroupVersion.Version,
},
ObjectMeta: meta,
}))
} else if err != nil {
return nil, err
}
return PatchService(c, cur, transform)
}
func PatchService(c clientset.Interface, cur *apiv1.Service, transform func(*apiv1.Service) *apiv1.Service) (*apiv1.Service, 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, apiv1.Service{})
if err != nil {
return nil, err
}
if len(patch) == 0 || string(patch) == "{}" {
return cur, nil
}
glog.V(3).Infof("Patching Service %s/%s with %s.", cur.Namespace, cur.Name, string(patch))
return c.CoreV1().Services(cur.Namespace).Patch(cur.Name, types.StrategicMergePatchType, patch)
}
func TryPatchService(c clientset.Interface, meta metav1.ObjectMeta, transform func(*apiv1.Service) *apiv1.Service) (result *apiv1.Service, err error) {
attempt := 0
err = wait.PollImmediate(kutil.RetryInterval, kutil.RetryTimeout, func() (bool, error) {
attempt++
cur, e2 := c.CoreV1().Services(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(e2) {
return false, e2
} else if e2 == nil {
result, e2 = PatchService(c, cur, transform)
return e2 == nil, nil
}
glog.Errorf("Attempt %d failed to patch Service %s/%s due to %v.", attempt, cur.Namespace, cur.Name, e2)
return false, nil
})
if err != nil {
err = fmt.Errorf("failed to patch Service %s/%s after %d attempts due to %v", meta.Namespace, meta.Name, attempt, err)
}
return
}
func TryUpdateService(c clientset.Interface, meta metav1.ObjectMeta, transform func(*apiv1.Service) *apiv1.Service) (result *apiv1.Service, err error) {
attempt := 0
err = wait.PollImmediate(kutil.RetryInterval, kutil.RetryTimeout, func() (bool, error) {
attempt++
cur, e2 := c.CoreV1().Services(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(e2) {
return false, e2
} else if e2 == nil {
result, e2 = c.CoreV1().Services(cur.Namespace).Update(transform(cur))
return e2 == nil, nil
}
glog.Errorf("Attempt %d failed to update Service %s/%s due to %v.", attempt, cur.Namespace, cur.Name, e2)
return false, nil
})
if err != nil {
err = fmt.Errorf("failed to update Service %s/%s after %d attempts due to %v", meta.Namespace, meta.Name, attempt, err)
}
return
}