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main.go
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main.go
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package main
import (
"context"
"fmt"
"os"
"os/signal"
"path/filepath"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/pkg/errors"
"github.com/urfave/cli"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/klog/v2"
pvController "sigs.k8s.io/sig-storage-lib-external-provisioner/v10/controller"
)
var (
VERSION = "0.0.1"
FlagConfigFile = "config"
FlagProvisionerName = "provisioner-name"
EnvProvisionerName = "PROVISIONER_NAME"
DefaultProvisionerName = "rancher.io/local-path"
FlagNamespace = "namespace"
EnvNamespace = "POD_NAMESPACE"
DefaultNamespace = "local-path-storage"
FlagHelperImage = "helper-image"
EnvHelperImage = "HELPER_IMAGE"
DefaultHelperImage = "rancher/library-busybox:1.32.1"
FlagServiceAccountName = "service-account-name"
DefaultServiceAccount = "local-path-provisioner-service-account"
EnvServiceAccountName = "SERVICE_ACCOUNT_NAME"
FlagKubeconfig = "kubeconfig"
DefaultConfigFileKey = "config.json"
DefaultConfigMapName = "local-path-config"
FlagConfigMapName = "configmap-name"
FlagHelperPodFile = "helper-pod-file"
DefaultHelperPodFile = "helperPod.yaml"
FlagWorkerThreads = "worker-threads"
DefaultWorkerThreads = pvController.DefaultThreadiness
FlagProvisioningRetryCount = "provisioning-retry-count"
DefaultProvisioningRetryCount = pvController.DefaultFailedProvisionThreshold
FlagDeletionRetryCount = "deletion-retry-count"
DefaultDeletionRetryCount = pvController.DefaultFailedDeleteThreshold
EnvConfigMountPath = "CONFIG_MOUNT_PATH"
)
func cmdNotFound(_ *cli.Context, command string) {
panic(fmt.Errorf("Unrecognized command: %s", command))
}
func onUsageError(_ *cli.Context, err error, _ bool) error {
panic(errors.Wrap(err, "Usage error, please check your command"))
}
func RegisterShutdownChannel(cancelFn context.CancelFunc) {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
go func() {
sig := <-sigs
klog.Infof("Receive %v to exit", sig)
cancelFn()
}()
}
func StartCmd() cli.Command {
return cli.Command{
Name: "start",
Flags: []cli.Flag{
cli.StringFlag{
Name: FlagConfigFile,
Usage: "Required. Provisioner configuration file.",
Value: "",
},
cli.StringFlag{
Name: FlagProvisionerName,
Usage: "Required. Specify Provisioner name.",
EnvVar: EnvProvisionerName,
Value: DefaultProvisionerName,
},
cli.StringFlag{
Name: FlagNamespace,
Usage: "Required. The namespace that Provisioner is running in",
EnvVar: EnvNamespace,
Value: DefaultNamespace,
},
cli.StringFlag{
Name: FlagHelperImage,
Usage: "Required. The helper image used for create/delete directories on the host",
EnvVar: EnvHelperImage,
Value: DefaultHelperImage,
},
cli.StringFlag{
Name: FlagKubeconfig,
Usage: "Paths to a kubeconfig. Only required when it is out-of-cluster.",
Value: "",
},
cli.StringFlag{
Name: FlagConfigMapName,
Usage: "Required. Specify configmap name.",
Value: DefaultConfigMapName,
},
cli.StringFlag{
Name: FlagServiceAccountName,
Usage: "Required. The ServiceAccountName for deployment",
EnvVar: EnvServiceAccountName,
Value: DefaultServiceAccount,
},
cli.StringFlag{
Name: FlagHelperPodFile,
Usage: "Paths to the Helper pod yaml file",
Value: "",
},
cli.IntFlag{
Name: FlagWorkerThreads,
Usage: "Number of provisioner worker threads.",
Value: DefaultWorkerThreads,
},
cli.IntFlag{
Name: FlagProvisioningRetryCount,
Usage: "Number of retries of failed volume provisioning. 0 means retry indefinitely.",
Value: DefaultProvisioningRetryCount,
},
cli.IntFlag{
Name: FlagDeletionRetryCount,
Usage: "Number of retries of failed volume deletion. 0 means retry indefinitely.",
Value: DefaultDeletionRetryCount,
},
},
Action: func(c *cli.Context) {
if err := startDaemon(c); err != nil {
logrus.Fatalf("Error starting daemon: %v", err)
}
},
}
}
func homeDir() string {
if h := os.Getenv("HOME"); h != "" {
return h
}
return os.Getenv("USERPROFILE") // windows
}
func loadConfig(kubeconfig string) (*rest.Config, error) {
if len(kubeconfig) > 0 {
return clientcmd.BuildConfigFromFlags("", kubeconfig)
}
kubeconfigPath := os.Getenv(clientcmd.RecommendedConfigPathEnvVar)
if len(kubeconfigPath) > 0 {
envVarFiles := filepath.SplitList(kubeconfigPath)
for _, f := range envVarFiles {
if _, err := os.Stat(f); err == nil {
return clientcmd.BuildConfigFromFlags("", f)
}
}
}
if c, err := rest.InClusterConfig(); err == nil {
return c, nil
}
kubeconfig = filepath.Join(homeDir(), clientcmd.RecommendedHomeDir, clientcmd.RecommendedFileName)
return clientcmd.BuildConfigFromFlags("", kubeconfig)
}
func findConfigFileFromConfigMap(kubeClient clientset.Interface, namespace, configMapName, key string) (string, error) {
cm, err := kubeClient.CoreV1().ConfigMaps(namespace).Get(context.TODO(), configMapName, metav1.GetOptions{})
if err != nil {
return "", err
}
value, ok := cm.Data[key]
if !ok {
return "", fmt.Errorf("%v is not exist in local-path-config ConfigMap", key)
}
return value, nil
}
func startDaemon(c *cli.Context) error {
ctx, cancelFn := context.WithCancel(context.TODO())
RegisterShutdownChannel(cancelFn)
config, err := loadConfig(c.String(FlagKubeconfig))
if err != nil {
return errors.Wrap(err, "unable to get client config")
}
kubeClient, err := clientset.NewForConfig(config)
if err != nil {
return errors.Wrap(err, "unable to get k8s client")
}
provisionerName := c.String(FlagProvisionerName)
if provisionerName == "" {
return fmt.Errorf("invalid empty flag %v", FlagProvisionerName)
}
namespace := c.String(FlagNamespace)
if namespace == "" {
return fmt.Errorf("invalid empty flag %v", FlagNamespace)
}
configMapName := c.String(FlagConfigMapName)
if configMapName == "" {
return fmt.Errorf("invalid empty flag %v", FlagConfigMapName)
}
configFile := c.String(FlagConfigFile)
if configFile == "" {
configFile, err = findConfigFileFromConfigMap(kubeClient, namespace, configMapName, DefaultConfigFileKey)
if err != nil {
return fmt.Errorf("invalid empty flag %v and it also does not exist at ConfigMap %v/%v with err: %v", FlagConfigFile, namespace, configMapName, err)
}
}
helperImage := c.String(FlagHelperImage)
if helperImage == "" {
return fmt.Errorf("invalid empty flag %v", FlagHelperImage)
}
serviceAccountName := c.String(FlagServiceAccountName)
if serviceAccountName == "" {
return fmt.Errorf("invalid empty flag %v", FlagServiceAccountName)
}
// if helper pod file is not specified, then find the helper pod by configmap with key = helperPod.yaml
// if helper pod file is specified with flag FlagHelperPodFile, then load the file
helperPodFile := c.String(FlagHelperPodFile)
helperPodYaml := ""
if helperPodFile == "" {
helperPodYaml, err = findConfigFileFromConfigMap(kubeClient, namespace, configMapName, DefaultHelperPodFile)
if err != nil {
return fmt.Errorf("invalid empty flag %v and it also does not exist at ConfigMap %v/%v with err: %v", FlagHelperPodFile, namespace, configMapName, err)
}
} else {
helperPodYaml, err = loadFile(helperPodFile)
if err != nil {
return fmt.Errorf("could not open file %v with err: %v", helperPodFile, err)
}
}
provisioningRetryCount := c.Int(FlagProvisioningRetryCount)
if provisioningRetryCount < 0 {
return fmt.Errorf("invalid negative integer flag %v", FlagProvisioningRetryCount)
}
deletionRetryCount := c.Int(FlagDeletionRetryCount)
if deletionRetryCount < 0 {
return fmt.Errorf("invalid negative integer flag %v", FlagDeletionRetryCount)
}
workerThreads := c.Int(FlagWorkerThreads)
if workerThreads <= 0 {
return fmt.Errorf("invalid zero or negative integer flag %v", FlagWorkerThreads)
}
provisioner, err := NewProvisioner(ctx, kubeClient, configFile, namespace, helperImage, configMapName, serviceAccountName, helperPodYaml)
if err != nil {
return err
}
pc := pvController.NewProvisionController(
klog.FromContext(ctx),
kubeClient,
provisionerName,
provisioner,
pvController.LeaderElection(false),
pvController.FailedProvisionThreshold(provisioningRetryCount),
pvController.FailedDeleteThreshold(deletionRetryCount),
pvController.Threadiness(workerThreads),
)
logrus.Debug("Provisioner started")
pc.Run(ctx)
logrus.Debug("Provisioner stopped")
return nil
}
func main() {
logrus.SetFormatter(&logrus.TextFormatter{FullTimestamp: true})
a := cli.NewApp()
a.Version = VERSION
a.Usage = "Local Path Provisioner"
a.Before = func(c *cli.Context) error {
if c.GlobalBool("debug") {
logrus.SetLevel(logrus.DebugLevel)
}
return nil
}
a.Flags = []cli.Flag{
cli.BoolFlag{
Name: "debug, d",
Usage: "enable debug logging level",
EnvVar: "RANCHER_DEBUG",
},
}
a.Commands = []cli.Command{
StartCmd(),
}
a.CommandNotFound = cmdNotFound
a.OnUsageError = onUsageError
if err := a.Run(os.Args); err != nil {
logrus.Fatalf("Critical error: %v", err)
}
}