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client.go
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client.go
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package clientutil
import (
"context"
"fmt"
"github.com/pkg/errors"
"k8s.io/apimachinery/pkg/api/equality"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const debugLogLevel = 1
// OperationResult is the action result of a CreateOrUpdate call
type OperationResult string
const ( // They should complete the sentence "Deployment default/foo has been ..."
// OperationResultNone means that the resource has not been changed
OperationResultNone OperationResult = "unchanged"
// OperationResultCreated means that a new resource is created
OperationResultCreated OperationResult = "created"
// OperationResultUpdated means that an existing resource is updated
OperationResultUpdated OperationResult = "updated"
)
func CreateOrPatch(ctx context.Context, c client.Client, obj client.Object, mutate func() error) (OperationResult, error) {
if err := c.Get(ctx, client.ObjectKeyFromObject(obj), obj); err != nil {
if !apierrors.IsNotFound(err) {
return OperationResultNone, err
}
if err := mutate(); err != nil {
return OperationResultNone, errors.Wrap(err, "mutating object failed")
}
if err := c.Create(ctx, obj); err != nil {
return OperationResultNone, IgnoreAlreadyExists(err)
}
return OperationResultCreated, nil
}
if o, err := meta.Accessor(obj); err == nil {
if o.GetDeletionTimestamp() != nil {
return OperationResultNone, fmt.Errorf("the resource %s/%s already exists but is marked for deletion", o.GetNamespace(), o.GetName())
}
}
return patch(ctx, c, obj, mutate, false)
}
func Patch(ctx context.Context, c client.Client, obj client.Object, mutate func() error) (OperationResult, error) {
return patch(ctx, c, obj, mutate, false)
}
func PatchStatus(ctx context.Context, c client.Client, obj client.Object, mutate func() error) (OperationResult, error) {
return patch(ctx, c, obj, mutate, true)
}
func patch(ctx context.Context, c client.Client, obj client.Object, mutate func() error, status bool) (OperationResult, error) {
before := obj.DeepCopyObject().(client.Object)
if err := mutate(); err != nil {
return OperationResultNone, errors.Wrap(err, "mutating object failed")
}
if equality.Semantic.DeepEqual(before, obj) {
return OperationResultNone, nil
}
patch := client.MergeFrom(before)
var err error
if status {
err = c.Status().Patch(ctx, obj, patch)
} else {
err = c.Patch(ctx, obj, patch)
}
if err != nil {
return OperationResultNone, err
}
return OperationResultUpdated, nil
}