helm/pkg/kube/fake/printer.go

/*
Copyright The Helm 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 fake

import (
	"io"
	"strings"
	"time"

	v1 "k8s.io/api/core/v1"
	"k8s.io/cli-runtime/pkg/resource"

	"helm.sh/helm/v3/pkg/kube"
)

// PrintingKubeClient implements KubeClient, but simply prints the reader to
// the given output.
type PrintingKubeClient struct {
	Out io.Writer
}

// isReachable checks if the cluster is reachable
func (p *PrintingKubeClient) IsReachable() error {
	return nil
}

// Create prints the values of what would be created with a real KubeClient.
func (p *PrintingKubeClient) Create(resources kube.ResourceList) (*kube.Result, error) {
	_, err := io.Copy(p.Out, bufferize(resources))
	if err != nil {
		return nil, err
	}
	return &kube.Result{Created: resources}, nil
}

func (p *PrintingKubeClient) Wait(resources kube.ResourceList, _ time.Duration) error {
	_, err := io.Copy(p.Out, bufferize(resources))
	return err
}

// Delete implements KubeClient delete.
//
// It only prints out the content to be deleted.
func (p *PrintingKubeClient) Delete(resources kube.ResourceList) (*kube.Result, []error) {
	_, err := io.Copy(p.Out, bufferize(resources))
	if err != nil {
		return nil, []error{err}
	}
	return &kube.Result{Deleted: resources}, nil
}

// WatchUntilReady implements KubeClient WatchUntilReady.
func (p *PrintingKubeClient) WatchUntilReady(resources kube.ResourceList, _ time.Duration) error {
	_, err := io.Copy(p.Out, bufferize(resources))
	return err
}

// Update implements KubeClient Update.
func (p *PrintingKubeClient) Update(_, modified kube.ResourceList, _ bool) (*kube.Result, error) {
	_, err := io.Copy(p.Out, bufferize(modified))
	if err != nil {
		return nil, err
	}
	// TODO: This doesn't completely mock out have some that get created,
	// updated, and deleted. I don't think these are used in any unit tests, but
	// we may want to refactor a way to handle future tests
	return &kube.Result{Updated: modified}, nil
}

// Build implements KubeClient Build.
func (p *PrintingKubeClient) Build(_ io.Reader, _ bool) (kube.ResourceList, error) {
	return []*resource.Info{}, nil
}

// WaitAndGetCompletedPodPhase implements KubeClient WaitAndGetCompletedPodPhase.
func (p *PrintingKubeClient) WaitAndGetCompletedPodPhase(_ string, _ time.Duration) (v1.PodPhase, error) {
	return v1.PodSucceeded, nil
}

func bufferize(resources kube.ResourceList) io.Reader {
	var builder strings.Builder
	for _, info := range resources {
		builder.WriteString(info.String() + "\n")
	}
	return strings.NewReader(builder.String())
}