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helm3.go
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helm3.go
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package helm3
import (
"bytes"
"context"
"fmt"
"os/exec"
"sort"
"strings"
"time"
log "github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kblabels "k8s.io/apimachinery/pkg/labels"
k8syaml "sigs.k8s.io/yaml"
"github.com/flant/addon-operator/pkg/app"
"github.com/flant/addon-operator/pkg/helm/client"
"github.com/flant/addon-operator/pkg/utils"
klient "github.com/flant/kube-client/client"
"github.com/flant/shell-operator/pkg/executor"
)
var Helm3Path = "helm"
type Helm3Options struct {
Namespace string
HistoryMax int32
Timeout time.Duration
KubeClient *klient.Client
}
var Options *Helm3Options
// Init runs
func Init(options *Helm3Options) error {
hc := &Helm3Client{
LogEntry: log.WithField("operator.component", "helm"),
}
err := hc.initAndVersion()
if err != nil {
return err
}
Options = options
return nil
}
type Helm3Client struct {
KubeClient *klient.Client
LogEntry *log.Entry
Namespace string
}
var _ client.HelmClient = &Helm3Client{}
func NewClient(logLabels ...map[string]string) client.HelmClient {
logEntry := log.WithField("operator.component", "helm")
if len(logLabels) > 0 {
logEntry = logEntry.WithFields(utils.LabelsToLogFields(logLabels[0]))
}
return &Helm3Client{
LogEntry: logEntry,
KubeClient: Options.KubeClient,
Namespace: Options.Namespace,
}
}
func (h *Helm3Client) WithKubeClient(client *klient.Client) {
h.KubeClient = client
}
// cmd runs Helm binary with specified arguments.
func (h *Helm3Client) cmd(args ...string) (stdout string, stderr string, err error) {
cmd := exec.Command(Helm3Path, args...)
var stdoutBuf bytes.Buffer
cmd.Stdout = &stdoutBuf
var stderrBuf bytes.Buffer
cmd.Stderr = &stderrBuf
err = executor.Run(cmd)
stdout = strings.TrimSpace(stdoutBuf.String())
stderr = strings.TrimSpace(stderrBuf.String())
return
}
// initAndVersion runs helm version command.
func (h *Helm3Client) initAndVersion() error {
stdout, stderr, err := h.cmd("version", "--short")
if err != nil {
return fmt.Errorf("unable to get helm version: %v\n%v %v", err, stdout, stderr)
}
stdout = strings.Join([]string{stdout, stderr}, "\n")
stdout = strings.ReplaceAll(stdout, "\n", " ")
log.Infof("Helm 3 version: %s", stdout)
return nil
}
// LastReleaseStatus returns last known revision for release and its status
//
// Example helm history output:
// REVISION UPDATED STATUS CHART DESCRIPTION
// 1 Fri Jul 14 18:25:00 2017 SUPERSEDED symfony-demo-0.1.0 Install complete
func (h *Helm3Client) LastReleaseStatus(releaseName string) (revision string, status string, err error) {
stdout, stderr, err := h.cmd("history", releaseName, "--max", "1", "--output", "yaml")
if err != nil {
errLine := strings.Split(stderr, "\n")[0]
if strings.Contains(errLine, "Error:") && strings.Contains(errLine, "not found") {
// Bad module name or no releases installed
err = fmt.Errorf("release '%s' not found\n%v %v", releaseName, stdout, stderr)
revision = "0"
return
}
err = fmt.Errorf("cannot get history for release '%s'\n%v %v", releaseName, stdout, stderr)
return
}
var historyInfo []map[string]string
err = k8syaml.Unmarshal([]byte(stdout), &historyInfo)
if err != nil {
return "", "", fmt.Errorf("helm history returns invalid json: %v", err)
}
if len(historyInfo) == 0 {
return "", "", fmt.Errorf("helm history is empty: '%s'", stdout)
}
status, has := historyInfo[0]["status"]
if !has {
return "", "", fmt.Errorf("helm history has no 'status' field: '%s'", stdout)
}
revision, has = historyInfo[0]["revision"]
if !has {
return "", "", fmt.Errorf("helm history has no 'revision' field: '%s'", stdout)
}
return
}
func (h *Helm3Client) UpgradeRelease(releaseName string, chart string, valuesPaths []string, setValues []string, namespace string) error {
args := make([]string, 0)
args = append(args, "upgrade")
// releaseName and chart path are positional arguments, put them first.
args = append(args, releaseName)
args = append(args, chart)
// Flags for upgrade command.
args = append(args, "--install")
args = append(args, "--history-max")
args = append(args, fmt.Sprintf("%d", Options.HistoryMax))
args = append(args, "--timeout")
args = append(args, Options.Timeout.String())
if namespace != "" {
args = append(args, "--namespace")
args = append(args, namespace)
}
for _, valuesPath := range valuesPaths {
args = append(args, "--values")
args = append(args, valuesPath)
}
for _, setValue := range setValues {
args = append(args, "--set")
args = append(args, setValue)
}
h.LogEntry.Infof("Running helm upgrade for release '%s' with chart '%s' in namespace '%s' ...", releaseName, chart, namespace)
stdout, stderr, err := h.cmd(args...)
if err != nil {
return fmt.Errorf("helm upgrade failed: %s:\n%s %s", err, stdout, stderr)
}
h.LogEntry.Infof("Helm upgrade for release '%s' with chart '%s' in namespace '%s' successful:\n%s\n%s", releaseName, chart, namespace, stdout, stderr)
return nil
}
func (h *Helm3Client) GetReleaseValues(releaseName string) (utils.Values, error) {
args := make([]string, 0)
args = append(args, "get")
args = append(args, "values")
args = append(args, releaseName)
args = append(args, "--namespace")
args = append(args, h.Namespace)
args = append(args, "--output")
args = append(args, "yaml")
stdout, stderr, err := h.cmd(args...)
if err != nil {
return nil, fmt.Errorf("cannot get values of helm release %s: %s\n%s %s", releaseName, err, stdout, stderr)
}
values, err := utils.NewValuesFromBytes([]byte(stdout))
if err != nil {
return nil, fmt.Errorf("cannot get values of helm release %s: %s", releaseName, err)
}
return values, nil
}
func (h *Helm3Client) DeleteRelease(releaseName string) (err error) {
h.LogEntry.Debugf("helm release '%s': execute helm uninstall", releaseName)
args := make([]string, 0)
args = append(args, "uninstall")
args = append(args, releaseName)
args = append(args, "--namespace")
args = append(args, h.Namespace)
stdout, stderr, err := h.cmd(args...)
if err != nil {
return fmt.Errorf("helm uninstall %s invocation error: %v\n%v %v", releaseName, err, stdout, stderr)
}
return
}
func (h *Helm3Client) IsReleaseExists(releaseName string) (bool, error) {
revision, _, err := h.LastReleaseStatus(releaseName)
if err != nil && revision == "0" {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
// ListReleasesNames returns list of release names.
// Names are extracted from label "name" in Secrets with label "owner"=="helm".
func (h *Helm3Client) ListReleasesNames(labelSelector map[string]string) ([]string, error) {
labelsSet := make(kblabels.Set)
for k, v := range labelSelector {
labelsSet[k] = v
}
labelsSet["owner"] = "helm"
list, err := h.KubeClient.CoreV1().
Secrets(h.Namespace).
List(context.TODO(), metav1.ListOptions{LabelSelector: labelsSet.AsSelector().String()})
if err != nil {
h.LogEntry.Debugf("helm: list of releases ConfigMaps failed: %s", err)
return nil, err
}
uniqNamesMap := make(map[string]struct{})
for _, secret := range list.Items {
releaseName, hasKey := secret.Labels["name"]
if hasKey && releaseName != "" {
uniqNamesMap[releaseName] = struct{}{}
}
}
// Do not return ignored release.
delete(uniqNamesMap, app.HelmIgnoreRelease)
uniqNames := make([]string, 0)
for name := range uniqNamesMap {
uniqNames = append(uniqNames, name)
}
sort.Strings(uniqNames)
return uniqNames, nil
}
// Render renders helm templates for chart
func (h *Helm3Client) Render(releaseName string, chart string, valuesPaths []string, setValues []string, namespace string, debug bool) (string, error) {
args := make([]string, 0)
args = append(args, "template")
args = append(args, releaseName)
args = append(args, chart)
if debug {
args = append(args, "--debug")
}
if namespace != "" {
args = append(args, "--namespace")
args = append(args, namespace)
}
for _, valuesPath := range valuesPaths {
args = append(args, "--values")
args = append(args, valuesPath)
}
for _, setValue := range setValues {
args = append(args, "--set")
args = append(args, setValue)
}
h.LogEntry.Debugf("Render helm templates for chart '%s' in namespace '%s' ...", chart, namespace)
stdout, stderr, err := h.cmd(args...)
if err != nil {
return "", fmt.Errorf("helm upgrade failed: %s:\n%s %s", err, stdout, stderr)
}
h.LogEntry.Infof("Render helm templates for chart '%s' was successful", chart)
return stdout, nil
}