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helm.go
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helm.go
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/*
Parts of the code here for opening tunnel are based on Helm client source code.
*/
package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"github.com/coreos/etcd/client"
"github.com/ghodss/yaml"
"github.com/spf13/cobra"
"k8s.io/client-go/kubernetes"
_ "k8s.io/client-go/plugin/pkg/client/auth"
"k8s.io/client-go/rest"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/helm/pkg/helm"
helm_env "k8s.io/helm/pkg/helm/environment"
"k8s.io/helm/pkg/helm/portforwarder"
"k8s.io/helm/pkg/kube"
_ "k8s.io/helm/pkg/proto/hapi/chart"
"k8s.io/helm/pkg/proto/hapi/release"
"k8s.io/helm/pkg/tlsutil"
"log"
"os"
"strings"
"time"
)
var (
settings helm_env.EnvSettings
tlsServerName string // overrides the server name used to verify the hostname on the returned certificates from the server.
tlsCaCertFile string // path to TLS CA certificate file
tlsCertFile string // path to TLS certificate file
tlsKeyFile string // path to TLS key file
tlsVerify bool // enable TLS and verify remote certificates
tlsEnable bool // enable TLS
)
var (
masterURL string
kubeconfig string
etcdServiceURL string
deployedCharts []string
operatorsToDeleteKey = "/operatorsToDelete"
operatorsToInstallKey = "/operatorsToInstall"
)
func init() {
etcdServiceURL = "http://localhost:2379"
deployedCharts = make([]string, 0)
}
func configForContext(context string, kubeconfig string) (*rest.Config, error) {
config, err := kube.GetConfig(context, kubeconfig).ClientConfig()
if err != nil {
return nil, fmt.Errorf("could not get Kubernetes config for context %q: %s", context, err)
}
return config, nil
}
func getKubeClient() (*rest.Config, kubernetes.Interface, error) {
flag.Parse()
cfg, err := clientcmd.BuildConfigFromFlags(masterURL, kubeconfig)
if err != nil {
fmt.Println("Error building kubeconfig: %s", err.Error())
}
kubeClient, err := kubernetes.NewForConfig(cfg)
if err != nil {
fmt.Println("Error building kubernetes clientset: %s", err.Error())
}
return cfg, kubeClient, nil
}
func setupConnection() error {
var errToReturn error
//if settings.TillerHost == "" {
config, client, err := getKubeClient()
if err != nil {
fmt.Printf("Error: %v", err)
errToReturn = err
}
tunnel, err := portforwarder.New(settings.TillerNamespace, client, config)
if err != nil {
panic(err)
errToReturn = err
}
settings.TillerHost = fmt.Sprintf("localhost:%d", tunnel.Local)
fmt.Println("Created tunnel using local port:", tunnel.Local)
//}
return errToReturn
}
func main() {
settings.TillerNamespace = "kube-system"
settings.Home = "/.helm"
settings.TillerConnectionTimeout = 300
// Run forever
for {
operatorsToInstall := getOperatorChartList(operatorsToInstallKey)
if len(operatorsToInstall) > 0 {
//fmt.Printf("Operators to install:%v\n", operatorsToInstall)
}
operatorsToDelete := getOperatorChartList(operatorsToDeleteKey)
if len(operatorsToDelete) > 0 {
//fmt.Printf("Operators to delete:%v\n", operatorsToDelete)
}
newOperators := subtract(operatorsToInstall, deployedCharts)
if len(newOperators) > 0 || len(operatorsToDelete) > 0 {
connectionError := setupConnection()
if connectionError == nil {
options := []helm.Option{helm.Host(settings.TillerHost), helm.ConnectTimeout(settings.TillerConnectionTimeout)}
if tlsVerify || tlsEnable {
if tlsCaCertFile == "" {
tlsCaCertFile = settings.Home.TLSCaCert()
}
if tlsCertFile == "" {
tlsCertFile = settings.Home.TLSCert()
}
if tlsKeyFile == "" {
tlsKeyFile = settings.Home.TLSKey()
}
fmt.Println("Host=%q, Key=%q, Cert=%q, CA=%q\n", tlsKeyFile, tlsCertFile, tlsCaCertFile)
tlsopts := tlsutil.Options{
ServerName: tlsServerName,
KeyFile: tlsKeyFile,
CertFile: tlsCertFile,
InsecureSkipVerify: true,
}
if tlsVerify {
tlsopts.CaCertFile = tlsCaCertFile
tlsopts.InsecureSkipVerify = false
}
tlscfg, err := tlsutil.ClientConfig(tlsopts)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
options = append(options, helm.WithTLS(tlscfg))
}
helmClient := helm.NewClient(options...)
// Delete Operators
for _, chartURL := range operatorsToDelete {
releaseName := getReleaseName("release-" + chartURL)
fmt.Printf("Release Name to delete:%s\n", releaseName)
if releaseName != "" {
err1 := deleteChart(helmClient, releaseName)
if err1 != nil {
fmt.Printf("Error deleting chart %s %s", releaseName, err1)
}
// Delete Helm Release ConfigMap
deleteHelmReleaseConfigMap(releaseName)
// Delete Chart URL from deployedCharts
newChartList := make([]string, 0)
for _, depChart := range deployedCharts {
if depChart != chartURL {
newChartList = append(newChartList, depChart)
}
}
deployedCharts = newChartList
} else {
fmt.Printf("Did not find any release for %s\n", chartURL)
}
}
// Install Operators
operatorsToInstall = subtract(operatorsToInstall, operatorsToDelete)
if len(operatorsToInstall) > 0 {
fmt.Printf("Effective Operators to install:%v\n", operatorsToInstall)
}
for _, chartURL := range operatorsToInstall {
releases, err := helmClient.ListReleases(
helm.ReleaseListLimit(10),
helm.ReleaseListNamespace("default"),
)
if err != nil {
fmt.Printf("Error: %v", err)
}
alreadyDeployed, operatorName, operatorVersion := checkIfDeployed(chartURL, releases.GetReleases())
// releases.GetReleases() may return empty if connection to Tiller breaks
// If that happens alreadyDeployed will be false (its default value.)
// But the chart may actually be deployed from previous run. So check in our deployedCharts list
// to avoid re-triggering chart deployment.
// TODO(devdattakulkarni): Revisit when supporting Chart upgrades.
if !alreadyDeployed {
for _, deployedChart := range deployedCharts {
if deployedChart == chartURL {
alreadyDeployed = true
}
}
}
if !alreadyDeployed {
fmt.Println("Installing chart.")
fmt.Printf("Chart URL%s\n", chartURL)
cmd := &cobra.Command{}
out := cmd.OutOrStdout()
err, chartValues := getChartValues(chartURL)
if err != nil {
panic(err)
}
fmt.Printf("ChartValues:%v\n", chartValues)
err1, crds, releaseName := installChart(helmClient, out, chartURL, chartValues)
if err1 != nil {
fmt.Println("%%%%%%%%%")
fmt.Printf("Error: %v", err1)
fmt.Println("%%%%%%%%%")
errorString := string(err1.Error())
// Save Error in Etcd
saveOperatorCRDs(chartURL, []string{"error", errorString})
} else {
// Save CRDs in Etcd
saveOperatorCRDs(chartURL, crds)
// Save release name
saveReleaseName("release-"+chartURL, releaseName)
// Save Chart URL in deployedCharts
deployedCharts = append(deployedCharts, chartURL)
}
} else {
fmt.Println("Operator chart %s %s already deployed", operatorName, operatorVersion)
}
}
// Set the operatorsToInstall key with the new List
updateInstallList(operatorsToInstallKey, operatorsToInstall)
// After all Operators are deleted, reset the list in etcd
if len(operatorsToDelete) > 0 {
emptyList := make([]string, 0)
storeList(operatorsToDeleteKey, emptyList)
}
}
} // If len() || len()
time.Sleep(time.Second * 5)
}
}
func deleteHelmReleaseConfigMap(releaseName string) {
_, kubeclientset, err := getKubeClient()
if err != nil {
fmt.Printf("Error: %v", err)
}
configMapName := releaseName + ".v1"
err1 := kubeclientset.CoreV1().ConfigMaps("kube-system").Delete(configMapName, &metav1.DeleteOptions{})
if err1 != nil {
fmt.Printf("Error in deleting Helm ConfigMap:%s\n", err1.Error())
}
}
func getReleaseName(resourceKey string) string {
releaseName := getSingleValue(resourceKey)
return releaseName
}
func getSingleValue(resourceKey string) string {
var releaseName string
cfg := client.Config{
Endpoints: []string{etcdServiceURL},
Transport: client.DefaultTransport,
}
c, err := client.New(cfg)
if err != nil {
fmt.Printf("Error: %v\n", err)
}
kapi := client.NewKeysAPI(c)
resp, err1 := kapi.Get(context.Background(), resourceKey, nil)
if err1 != nil {
fmt.Printf("Error: %v\n", err1)
return ""
} else {
//log.Printf("%q key has %q value\n", resp.Node.Key, resp.Node.Value)
releaseName = resp.Node.Value
return releaseName
}
}
func saveReleaseName(resourceKey, releaseName string) {
storeSingleValue(resourceKey, releaseName)
}
func updateInstallList(resourceKey string, operatorList []string) {
storeList(resourceKey, operatorList)
}
func storeList(resourceKey string, dataList []string) {
cfg := client.Config{
Endpoints: []string{etcdServiceURL},
Transport: client.DefaultTransport,
}
c, err := client.New(cfg)
if err != nil {
fmt.Errorf("Error: %v", err)
}
kapi := client.NewKeysAPI(c)
jsonOperatorList, err2 := json.Marshal(&dataList)
if err2 != nil {
panic(err2)
}
resourceValue := string(jsonOperatorList)
//fmt.Printf("Setting %s->%s\n",resourceKey, resourceValue)
_, err1 := kapi.Set(context.Background(), resourceKey, resourceValue, nil)
if err1 != nil {
log.Fatal(err)
} else {
//log.Printf("Set is done. Metadata is %q\n", resp.Node.Value)
}
}
func storeSingleValue(resourceKey, resourceData string) {
cfg := client.Config{
Endpoints: []string{etcdServiceURL},
Transport: client.DefaultTransport,
}
c, err := client.New(cfg)
if err != nil {
log.Fatal(err)
}
kapi := client.NewKeysAPI(c)
fmt.Printf("Setting %s->%s\n", resourceKey, resourceData)
_, err1 := kapi.Set(context.Background(), resourceKey, resourceData, nil)
if err1 != nil {
log.Fatal(err1)
} else {
// print common key info
//log.Printf("Set is done. Metadata is %q\n", resp.Node.Value)
}
}
func subtract(installList, deleteList []string) []string {
operatorsToInstall := make([]string, 0)
for _, installChart := range installList {
found := false
for _, deleteChart := range deleteList {
if installChart == deleteChart {
found = true
}
}
if !found {
operatorsToInstall = append(operatorsToInstall, installChart)
}
}
return operatorsToInstall
}
func getChartValues(chartURL string) (error, []byte) {
valuesData := make([]byte, 0)
cfg := client.Config{
Endpoints: []string{etcdServiceURL},
Transport: client.DefaultTransport,
}
c, err := client.New(cfg)
if err != nil {
fmt.Printf("Error: %v\n", err)
}
kapi := client.NewKeysAPI(c)
resourceKey := "/chartvalues/" + chartURL
resp, err1 := kapi.Get(context.Background(), resourceKey, nil)
if err1 != nil {
fmt.Printf("Error: %v\n", err1)
return err1, valuesData
} else {
//log.Printf("%q key has %q value\n", resp.Node.Key, resp.Node.Value)
valuesString := resp.Node.Value
fmt.Printf("ValuesString:%s\n", valuesString)
if valuesString != "null" {
valuesMap := map[string]interface{}{}
if err = json.Unmarshal([]byte(valuesString), &valuesMap); err != nil {
fmt.Printf("Error: %v\n", err)
}
fmt.Printf("ValuesMap:%v\n", valuesMap)
valuesData, err1 := yaml.Marshal(valuesMap)
if err1 != nil {
return err1, valuesData
}
return nil, valuesData
} else {
return nil, nil
}
}
}
func getOperatorChartList(resourceKey string) []string {
cfg := client.Config{
Endpoints: []string{etcdServiceURL},
Transport: client.DefaultTransport,
}
c, err := client.New(cfg)
if err != nil {
fmt.Printf("Error: %v\n", err)
}
kapi := client.NewKeysAPI(c)
resp, err1 := kapi.Get(context.Background(), resourceKey, nil)
if err1 != nil {
return []string{}
} else {
//log.Printf("%q key has %q value\n", resp.Node.Key, resp.Node.Value)
operatorListString := resp.Node.Value
var operatorChartList []string
if err = json.Unmarshal([]byte(operatorListString), &operatorChartList); err != nil {
fmt.Printf("Error: %v", err)
}
return operatorChartList
}
}
func saveOperatorCRDs(chartURL string, contents []string) {
fmt.Println("Entering saveOperatorCRDs")
cfg := client.Config{
Endpoints: []string{etcdServiceURL},
Transport: client.DefaultTransport,
}
c, err := client.New(cfg)
if err != nil {
fmt.Printf("Error: %v", err)
}
kapi := client.NewKeysAPI(c)
resourceKey := chartURL
jsonContents, err2 := json.Marshal(&contents)
if err2 != nil {
fmt.Printf("Error: %v", err2)
}
resourceValue := string(jsonContents)
//fmt.Printf("Setting %s->%s\n", resourceKey, resourceValue)
_, err3 := kapi.Set(context.Background(), resourceKey, resourceValue, nil)
if err3 != nil {
fmt.Printf("Error: %v", err3)
} else {
//log.Printf("Set is done. Metadata is %q\n", resp.Node.Value)
}
fmt.Println("Exiting saveOperatorCRDs")
}
func checkIfDeployed(chartURL string, rels []*release.Release) (bool, string, string) {
alreadyDeployed := false
var operatorName, operatorVersion string
for _, r := range rels {
name := strings.TrimSuffix(r.GetChart().GetMetadata().GetName(), "\n")
version := strings.TrimSuffix(r.GetChart().GetMetadata().GetVersion(), "\n")
fmt.Printf("Name:%s Version:%s\n", name, version)
nameAndVersion := name + "-" + version
if strings.Contains(chartURL, nameAndVersion) {
alreadyDeployed = true
operatorName = name
operatorVersion = version
}
}
return alreadyDeployed, operatorName, operatorVersion
}
func init() {
flag.StringVar(&kubeconfig, "kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
flag.StringVar(&masterURL, "master", "", "The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.")
}