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kubectl.go
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kubectl.go
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// Copyright 2018 Istio 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 kube
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"sync"
"github.com/ghodss/yaml"
multierror "github.com/hashicorp/go-multierror"
"istio.io/istio/pkg/test"
"istio.io/istio/pkg/test/scopes"
"istio.io/istio/pkg/test/shell"
kubeApiMeta "k8s.io/apimachinery/pkg/apis/meta/v1"
)
type kubectl struct {
kubeConfig string
baseDir string
workDir string
workDirMutex sync.Mutex
}
// getWorkDir lazy-creates the working directory for the accessor.
func (c *kubectl) getWorkDir() (string, error) {
c.workDirMutex.Lock()
defer c.workDirMutex.Unlock()
workDir := c.workDir
if workDir == "" {
var err error
if workDir, err = ioutil.TempDir(c.baseDir, workDirPrefix); err != nil {
return "", err
}
c.workDir = workDir
}
return workDir, nil
}
// applyContents applies the given config contents using kubectl.
func (c *kubectl) applyContents(namespace string, contents string) ([]string, error) {
files, err := c.contentsToFileList(contents, "accessor_apply_contents")
if err != nil {
return nil, err
}
if err := c.applyInternal(namespace, files); err != nil {
return nil, err
}
return files, nil
}
// apply the config in the given filename using kubectl.
func (c *kubectl) apply(namespace string, filename string) error {
files, err := c.fileToFileList(filename)
if err != nil {
return err
}
return c.applyInternal(namespace, files)
}
func (c *kubectl) applyInternal(namespace string, files []string) error {
for _, f := range files {
scopes.CI.Infof("Applying YAML file: %s", f)
s, err := shell.Execute("kubectl apply %s %s -f %s", c.configArg(), namespaceArg(namespace), f)
if err != nil {
return fmt.Errorf("%v: %s", err, s)
}
}
return nil
}
// deleteContents deletes the given config contents using kubectl.
func (c *kubectl) deleteContents(namespace, contents string) error {
files, err := c.contentsToFileList(contents, "accessor_delete_contents")
if err != nil {
return err
}
return c.deleteInternal(namespace, files)
}
// delete the config in the given filename using kubectl.
func (c *kubectl) delete(namespace string, filename string) error {
files, err := c.fileToFileList(filename)
if err != nil {
return err
}
return c.deleteInternal(namespace, files)
}
func (c *kubectl) deleteInternal(namespace string, files []string) (err error) {
for i := len(files) - 1; i >= 0; i-- {
scopes.CI.Infof("Deleting YAML file: %s", files[i])
s, e := shell.Execute("kubectl delete %s %s -f %s", c.configArg(), namespaceArg(namespace), files[i])
if e != nil {
return multierror.Append(err, fmt.Errorf("%v: %s", e, s))
}
}
return
}
// logs calls the logs command for the specified pod, with -c, if container is specified.
func (c *kubectl) logs(namespace string, pod string, container string) (string, error) {
cmd := fmt.Sprintf("kubectl logs %s %s %s %s",
c.configArg(), namespaceArg(namespace), pod, containerArg(container))
s, err := shell.Execute(cmd)
if err == nil {
return s, nil
}
return "", fmt.Errorf("%v: %s", err, s)
}
func (c *kubectl) exec(namespace, pod, container, command string) (string, error) {
return shell.Execute("kubectl exec %s %s %s %s -- %s ", pod, namespaceArg(namespace), containerArg(container), c.configArg(), command)
}
func (c *kubectl) configArg() string {
return configArg(c.kubeConfig)
}
func (c *kubectl) fileToFileList(filename string) ([]string, error) {
content, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
files, err := c.splitContentsToFiles(string(content), filenameWithoutExtension(filename))
if err != nil {
return nil, err
}
if len(files) == 0 {
files = append(files, filename)
}
return files, nil
}
func (c *kubectl) contentsToFileList(contents, filenamePrefix string) ([]string, error) {
files, err := c.splitContentsToFiles(contents, filenamePrefix)
if err != nil {
return nil, err
}
if len(files) == 0 {
f, err := c.writeContentsToTempFile(contents)
if err != nil {
return nil, err
}
files = append(files, f)
}
return files, nil
}
func (c *kubectl) writeContentsToTempFile(contents string) (filename string, err error) {
defer func() {
if err != nil && filename != "" {
_ = os.Remove(filename)
filename = ""
}
}()
var workdir string
workdir, err = c.getWorkDir()
if err != nil {
return
}
var f *os.File
f, err = ioutil.TempFile(workdir, "accessor_")
if err != nil {
return
}
filename = f.Name()
_, err = f.WriteString(contents)
return
}
func (c *kubectl) splitContentsToFiles(content, filenamePrefix string) ([]string, error) {
cfgs := test.SplitConfigs(content)
namespacesAndCrds := &yamlDoc{
docType: namespacesAndCRDs,
}
misc := &yamlDoc{
docType: misc,
}
for _, cfg := range cfgs {
var typeMeta kubeApiMeta.TypeMeta
if e := yaml.Unmarshal([]byte(cfg), &typeMeta); e != nil {
// Ignore invalid parts. This most commonly happens when it's empty or contains only comments.
continue
}
switch typeMeta.Kind {
case "Namespace":
namespacesAndCrds.append(cfg)
case "CustomResourceDefinition":
namespacesAndCrds.append(cfg)
default:
misc.append(cfg)
}
}
// If all elements were put into a single doc just return an empty list, indicating that the original
// content should be used.
docs := []*yamlDoc{namespacesAndCrds, misc}
for _, doc := range docs {
if len(doc.content) == 0 {
return make([]string, 0), nil
}
}
filesToApply := make([]string, 0, len(docs))
for _, doc := range docs {
workDir, err := c.getWorkDir()
if err != nil {
return nil, err
}
tfile, err := doc.toTempFile(workDir, filenamePrefix)
if err != nil {
return nil, err
}
filesToApply = append(filesToApply, tfile)
}
return filesToApply, nil
}
func configArg(kubeConfig string) string {
if kubeConfig != "" {
return fmt.Sprintf("--kubeconfig=%s", kubeConfig)
}
return ""
}
func namespaceArg(namespace string) string {
if namespace != "" {
return fmt.Sprintf("-n %s", namespace)
}
return ""
}
func containerArg(container string) string {
if container != "" {
return fmt.Sprintf("-c %s", container)
}
return ""
}
func filenameWithoutExtension(fullPath string) string {
_, f := filepath.Split(fullPath)
return strings.TrimSuffix(f, filepath.Ext(fullPath))
}
type docType string
const (
namespacesAndCRDs docType = "namespaces_and_crds"
misc docType = "misc"
)
type yamlDoc struct {
content string
docType docType
}
func (d *yamlDoc) append(c string) {
d.content = test.JoinConfigs(d.content, c)
}
func (d *yamlDoc) toTempFile(workDir, fileNamePrefix string) (string, error) {
f, err := ioutil.TempFile(workDir, fmt.Sprintf("%s_%s.yaml", fileNamePrefix, d.docType))
if err != nil {
return "", err
}
defer f.Close()
name := f.Name()
_, err = f.WriteString(d.content)
if err != nil {
return "", err
}
return name, nil
}