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helpers.go
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/
helpers.go
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// Copyright 2022 Google LLC.
//
// 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 testhelpers
import (
"context"
"fmt"
"time"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
const DefaultRetryInterval = 5 * time.Second
// CreateOrPatchNamespace ensures that a namespace exists with the given name
// in kubernetes, or fails the test as fatal.
func (cc *TestCaseClient) CreateOrPatchNamespace(ctx context.Context) error {
var newNS = corev1.Namespace{
TypeMeta: metav1.TypeMeta{Kind: "Namespace", APIVersion: "v1"},
ObjectMeta: metav1.ObjectMeta{Name: cc.Namespace},
}
_, err := controllerutil.CreateOrPatch(ctx, cc.Client, &newNS, func() error {
newNS.ObjectMeta.Name = cc.Namespace
return nil
})
if err != nil {
return fmt.Errorf("unable to verify existance of namespace %v, %v", cc.Namespace, err)
}
var gotNS corev1.Namespace
err = RetryUntilSuccess(5, DefaultRetryInterval, func() error {
return cc.Client.Get(ctx, client.ObjectKey{Name: cc.Namespace}, &gotNS)
})
if err != nil {
return fmt.Errorf("unable to verify existance of namespace %v, %v", cc.Namespace, err)
}
return nil
}
func (cc *TestCaseClient) DeleteNamespace(ctx context.Context) error {
ns := &corev1.Namespace{
TypeMeta: metav1.TypeMeta{Kind: "Namespace", APIVersion: "v1"},
ObjectMeta: metav1.ObjectMeta{Name: cc.Namespace},
}
return cc.Client.Delete(ctx, ns)
}
// RetryUntilSuccess runs `f` until it no longer returns an error, or it has
// returned an error `attempts` number of times. It sleeps duration `d`
// between failed attempts. It returns the error from the last attempt.
func RetryUntilSuccess(attempts int, d time.Duration, f func() error) (err error) {
for i := 0; i < attempts; i++ {
if i > 0 {
time.Sleep(d)
}
err = f()
if err == nil {
return nil
}
}
return fmt.Errorf("after %d attempts, last error: %s", attempts, err)
}