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utils.go
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utils.go
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package node
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"regexp"
"strings"
"syscall"
"time"
"github.com/pkg/errors"
"github.com/rancher/norman/types/convert"
"github.com/rancher/rancher/pkg/jailer"
v3 "github.com/rancher/types/apis/management.cattle.io/v3"
"github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
var regExHyphen = regexp.MustCompile("([a-z])([A-Z])")
var (
RegExNodeDirEnv = regexp.MustCompile("^" + nodeDirEnvKey + ".*")
RegExNodePluginToken = regexp.MustCompile("^" + "MACHINE_PLUGIN_TOKEN=" + ".*")
RegExNodeDriverName = regexp.MustCompile("^" + "MACHINE_PLUGIN_DRIVER_NAME=" + ".*")
)
const (
errorCreatingNode = "Error creating machine: "
nodeDirEnvKey = "MACHINE_STORAGE_PATH="
nodeCmd = "docker-machine"
ec2TagFlag = "tags"
)
func buildAgentCommand(node *v3.Node, dockerRun string) []string {
drun := strings.Fields(dockerRun)
cmd := []string{"--native-ssh", "ssh", node.Spec.RequestedHostname}
cmd = append(cmd, drun...)
cmd = append(cmd, "-r", "-n", node.Name)
return cmd
}
func buildCreateCommand(node *v3.Node, configMap map[string]interface{}) []string {
sDriver := strings.ToLower(node.Status.NodeTemplateSpec.Driver)
cmd := []string{"create", "-d", sDriver}
cmd = append(cmd, buildEngineOpts("--engine-install-url", []string{node.Status.NodeTemplateSpec.EngineInstallURL})...)
cmd = append(cmd, buildEngineOpts("--engine-opt", mapToSlice(node.Status.NodeTemplateSpec.EngineOpt))...)
cmd = append(cmd, buildEngineOpts("--engine-env", mapToSlice(node.Status.NodeTemplateSpec.EngineEnv))...)
cmd = append(cmd, buildEngineOpts("--engine-insecure-registry", node.Status.NodeTemplateSpec.EngineInsecureRegistry)...)
cmd = append(cmd, buildEngineOpts("--engine-label", mapToSlice(node.Status.NodeTemplateSpec.EngineLabel))...)
cmd = append(cmd, buildEngineOpts("--engine-registry-mirror", node.Status.NodeTemplateSpec.EngineRegistryMirror)...)
cmd = append(cmd, buildEngineOpts("--engine-storage-driver", []string{node.Status.NodeTemplateSpec.EngineStorageDriver})...)
for k, v := range configMap {
dmField := "--" + sDriver + "-" + strings.ToLower(regExHyphen.ReplaceAllString(k, "${1}-${2}"))
if v == nil {
continue
}
switch v.(type) {
case float64:
cmd = append(cmd, dmField, fmt.Sprintf("%v", v))
case string:
if v.(string) != "" {
cmd = append(cmd, dmField, v.(string))
}
case bool:
if v.(bool) {
cmd = append(cmd, dmField)
}
case []interface{}:
for _, s := range v.([]interface{}) {
if _, ok := s.(string); ok {
cmd = append(cmd, dmField, s.(string))
}
}
}
}
logrus.Debugf("create cmd %v", cmd)
cmd = append(cmd, node.Spec.RequestedHostname)
return cmd
}
func buildEngineOpts(name string, values []string) []string {
var opts []string
for _, value := range values {
if value == "" {
continue
}
opts = append(opts, name, value)
}
return opts
}
func mapToSlice(m map[string]string) []string {
var ret []string
for k, v := range m {
ret = append(ret, fmt.Sprintf("%s=%s", k, v))
}
return ret
}
func buildCommand(nodeDir string, node *v3.Node, cmdArgs []string) (*exec.Cmd, error) {
// In dev_mode, don't need jail or reference to jail in command
if os.Getenv("CATTLE_DEV_MODE") != "" {
env := initEnviron(nodeDir)
command := exec.Command(nodeCmd, cmdArgs...)
command.Env = env
return command, nil
}
cred, err := jailer.GetUserCred()
if err != nil {
return nil, errors.WithMessage(err, "get user cred error")
}
command := exec.Command(nodeCmd, cmdArgs...)
command.SysProcAttr = &syscall.SysProcAttr{}
command.SysProcAttr.Credential = cred
command.SysProcAttr.Chroot = path.Join(jailer.BaseJailPath, node.Namespace)
envvars := []string{
nodeDirEnvKey + nodeDir,
"PATH=/usr/bin:/var/lib/rancher/management-state/bin",
}
command.Env = jailer.WhitelistEnvvars(envvars)
return command, nil
}
func initEnviron(nodeDir string) []string {
env := os.Environ()
found := false
for idx, ev := range env {
if RegExNodeDirEnv.MatchString(ev) {
env[idx] = nodeDirEnvKey + nodeDir
found = true
}
if RegExNodePluginToken.MatchString(ev) {
env[idx] = ""
}
if RegExNodeDriverName.MatchString(ev) {
env[idx] = ""
}
}
if !found {
env = append(env, nodeDirEnvKey+nodeDir)
}
return env
}
func startReturnOutput(command *exec.Cmd) (io.ReadCloser, io.ReadCloser, error) {
readerStdout, err := command.StdoutPipe()
if err != nil {
return nil, nil, err
}
readerStderr, err := command.StderrPipe()
if err != nil {
return nil, nil, err
}
if err := command.Start(); err != nil {
readerStdout.Close()
readerStderr.Close()
return nil, nil, err
}
return readerStdout, readerStderr, nil
}
func getSSHKey(nodeDir, keyPath string, obj *v3.Node) (string, error) {
keyName := filepath.Base(keyPath)
if keyName == "" || keyName == "." || keyName == string(filepath.Separator) {
keyName = "id_rsa"
}
if err := waitUntilSSHKey(nodeDir, keyName, obj); err != nil {
return "", err
}
return getSSHPrivateKey(nodeDir, keyName, obj)
}
func (m *Lifecycle) reportStatus(stdoutReader io.Reader, stderrReader io.Reader, node *v3.Node) (*v3.Node, error) {
scanner := bufio.NewScanner(stdoutReader)
for scanner.Scan() {
msg := scanner.Text()
if strings.Contains(msg, "To see how to connect") {
continue
}
logrus.Infof("stdout: %s", msg)
_, err := filterDockerMessage(msg, node)
if err != nil {
return node, err
}
logrus.Info(msg)
v3.NodeConditionProvisioned.Message(node, msg)
// ignore update errors
if newObj, err := m.nodeClient.Update(node); err == nil {
node = newObj
} else {
node, _ = m.nodeClient.Get(node.Name, metav1.GetOptions{})
}
}
scanner = bufio.NewScanner(stderrReader)
for scanner.Scan() {
msg := scanner.Text()
return node, errors.New(msg)
}
return node, nil
}
func filterDockerMessage(msg string, node *v3.Node) (string, error) {
if strings.Contains(msg, errorCreatingNode) {
return "", errors.New(msg)
}
if strings.Contains(msg, node.Spec.RequestedHostname) {
return "", nil
}
return msg, nil
}
func nodeExists(nodeDir string, node *v3.Node) (bool, error) {
command, err := buildCommand(nodeDir, node, []string{"ls", "-q"})
if err != nil {
return false, err
}
r, err := command.StdoutPipe()
if err != nil {
return false, err
}
if err = command.Start(); err != nil {
return false, err
}
defer command.Wait()
scanner := bufio.NewScanner(r)
for scanner.Scan() {
foundName := scanner.Text()
if foundName == node.Spec.RequestedHostname {
return true, nil
}
}
if err = scanner.Err(); err != nil {
return false, err
}
if err := command.Wait(); err != nil {
return false, err
}
return false, nil
}
func deleteNode(nodeDir string, node *v3.Node) error {
command, err := buildCommand(nodeDir, node, []string{"rm", "-f", node.Spec.RequestedHostname})
if err != nil {
return err
}
if err := command.Start(); err != nil {
return err
}
return command.Wait()
}
func getSSHPrivateKey(nodeDir, keyName string, node *v3.Node) (string, error) {
keyPath := filepath.Join(nodeDir, "machines", node.Spec.RequestedHostname, keyName)
data, err := ioutil.ReadFile(keyPath)
if err != nil {
return "", nil
}
return string(data), nil
}
func waitUntilSSHKey(nodeDir, keyName string, node *v3.Node) error {
keyPath := filepath.Join(nodeDir, "machines", node.Spec.RequestedHostname, keyName)
startTime := time.Now()
increments := 1
for {
if time.Now().After(startTime.Add(15 * time.Second)) {
return errors.New("Timeout waiting for ssh key")
}
if _, err := os.Stat(keyPath); err != nil {
logrus.Debugf("keyPath not found. The node is probably still provisioning. Sleep %v second", increments)
time.Sleep(time.Duration(increments) * time.Second)
increments = increments * 2
continue
}
return nil
}
}
func setEc2ClusterIDTag(data interface{}, clusterID string) {
if m, ok := data.(map[string]interface{}); ok {
tagValue := fmt.Sprintf("kubernetes.io/cluster/%s,owned", clusterID)
if tags, ok := m[ec2TagFlag]; !ok || convert.ToString(tags) == "" {
m[ec2TagFlag] = tagValue
} else {
m[ec2TagFlag] = convert.ToString(tags) + "," + tagValue
}
}
}