/
function.go
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/
function.go
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/*
Copyright The Stash Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package util
import (
"fmt"
api "stash.appscode.dev/apimachinery/apis/stash/v1beta1"
cs "stash.appscode.dev/apimachinery/client/clientset/versioned/typed/stash/v1beta1"
jsonpatch "github.com/evanphx/json-patch"
"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/wait"
kutil "kmodules.xyz/client-go"
)
func CreateOrPatchFunction(c cs.StashV1beta1Interface, meta metav1.ObjectMeta, transform func(fn *api.Function) *api.Function) (*api.Function, kutil.VerbType, error) {
cur, err := c.Functions().Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(err) {
glog.V(3).Infof("Creating Function %s/%s.", meta.Namespace, meta.Name)
out, err := c.Functions().Create(transform(&api.Function{
TypeMeta: metav1.TypeMeta{
Kind: "Function",
APIVersion: api.SchemeGroupVersion.String(),
},
ObjectMeta: meta,
}))
return out, kutil.VerbCreated, err
} else if err != nil {
return nil, kutil.VerbUnchanged, err
}
return PatchFunction(c, cur, transform)
}
func PatchFunction(c cs.StashV1beta1Interface, cur *api.Function, transform func(*api.Function) *api.Function) (*api.Function, kutil.VerbType, error) {
return PatchFunctionObject(c, cur, transform(cur.DeepCopy()))
}
func PatchFunctionObject(c cs.StashV1beta1Interface, cur, mod *api.Function) (*api.Function, kutil.VerbType, error) {
curJson, err := json.Marshal(cur)
if err != nil {
return nil, kutil.VerbUnchanged, err
}
modJson, err := json.Marshal(mod)
if err != nil {
return nil, kutil.VerbUnchanged, err
}
patch, err := jsonpatch.CreateMergePatch(curJson, modJson)
if err != nil {
return nil, kutil.VerbUnchanged, err
}
if len(patch) == 0 || string(patch) == "{}" {
return cur, kutil.VerbUnchanged, nil
}
glog.V(3).Infof("Patching Function %s/%s with %s.", cur.Namespace, cur.Name, string(patch))
out, err := c.Functions().Patch(cur.Name, types.MergePatchType, patch)
return out, kutil.VerbPatched, err
}
func TryUpdateFunction(c cs.StashV1beta1Interface, meta metav1.ObjectMeta, transform func(*api.Function) *api.Function) (result *api.Function, err error) {
attempt := 0
err = wait.PollImmediate(kutil.RetryInterval, kutil.RetryTimeout, func() (bool, error) {
attempt++
cur, e2 := c.Functions().Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(e2) {
return false, e2
} else if e2 == nil {
result, e2 = c.Functions().Update(transform(cur.DeepCopy()))
return e2 == nil, nil
}
glog.Errorf("Attempt %d failed to update Function %s/%s due to %v.", attempt, cur.Namespace, cur.Name, e2)
return false, nil
})
if err != nil {
err = fmt.Errorf("failed to update Function %s/%s after %d attempts due to %v", meta.Namespace, meta.Name, attempt, err)
}
return
}