common.go

/*
Copyright 2019 The Kubernetes Authors All rights reserved.

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"
	"testing"
	"time"

	"github.com/cenkalti/backoff"
	"github.com/pkg/errors"
	"k8s.io/apimachinery/pkg/labels"
	commonutil "k8s.io/minikube/pkg/util"
)

// WaitForBusyboxRunning waits until busybox pod to be running
func WaitForBusyboxRunning(t *testing.T, namespace string, miniProfile string) error {
	client, err := commonutil.GetClient(miniProfile)
	if err != nil {
		return errors.Wrap(err, "getting kubernetes client")
	}
	selector := labels.SelectorFromSet(labels.Set(map[string]string{"integration-test": "busybox"}))
	return commonutil.WaitForPodsWithLabelRunning(client, namespace, selector)
}

// Retry tries the callback for a number of attempts, with a delay between attempts
func Retry(t *testing.T, callback func() error, d time.Duration, attempts int) (err error) {
	for i := 0; i < attempts; i++ {
		err = callback()
		if err == nil {
			return nil
		}
		time.Sleep(d)
	}
	return err
}

// Retry2 tries the callback for a number of attempts, with a delay without *testing.T
func Retry2(callback func() error, d time.Duration, attempts int) (err error) {
	for i := 0; i < attempts; i++ {
		err = callback()
		if err == nil {
			return nil
		}
		time.Sleep(d)
	}
	return err
}

// RetryX is expontential backoff retry
func RetryX(callback func() error, initInterv time.Duration, maxTime time.Duration) error {
	b := backoff.NewExponentialBackOff()
	b.MaxElapsedTime = maxTime
	b.InitialInterval = initInterv
	b.RandomizationFactor = 0.5
	b.Multiplier = 1.5
	b.Reset()
	return backoff.Retry(callback, b)
}

// Logf writes logs to stdout if -v is set.
func Logf(str string, args ...interface{}) {
	if !testing.Verbose() {
		return
	}
	fmt.Printf(" %s | ", time.Now().Format("15:04:05"))
	fmt.Println(fmt.Sprintf(str, args...))
}