418 lines
12 KiB
Go
418 lines
12 KiB
Go
package driver
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"fmt"
|
|
"log"
|
|
"os/exec"
|
|
"path/filepath"
|
|
"runtime"
|
|
"strings"
|
|
"syscall"
|
|
"time"
|
|
|
|
"github.com/hashicorp/go-multierror"
|
|
"github.com/hashicorp/go-plugin"
|
|
"github.com/mitchellh/mapstructure"
|
|
|
|
"github.com/hashicorp/nomad/client/allocdir"
|
|
"github.com/hashicorp/nomad/client/config"
|
|
"github.com/hashicorp/nomad/client/driver/executor"
|
|
dstructs "github.com/hashicorp/nomad/client/driver/structs"
|
|
"github.com/hashicorp/nomad/client/fingerprint"
|
|
cstructs "github.com/hashicorp/nomad/client/structs"
|
|
"github.com/hashicorp/nomad/helper/discover"
|
|
"github.com/hashicorp/nomad/helper/fields"
|
|
"github.com/hashicorp/nomad/nomad/structs"
|
|
)
|
|
|
|
const (
|
|
// The key populated in Node Attributes to indicate presence of the Java
|
|
// driver
|
|
javaDriverAttr = "driver.java"
|
|
)
|
|
|
|
// JavaDriver is a simple driver to execute applications packaged in Jars.
|
|
// It literally just fork/execs tasks with the java command.
|
|
type JavaDriver struct {
|
|
DriverContext
|
|
fingerprint.StaticFingerprinter
|
|
}
|
|
|
|
type JavaDriverConfig struct {
|
|
JarPath string `mapstructure:"jar_path"`
|
|
JvmOpts []string `mapstructure:"jvm_options"`
|
|
Args []string `mapstructure:"args"`
|
|
}
|
|
|
|
// javaHandle is returned from Start/Open as a handle to the PID
|
|
type javaHandle struct {
|
|
pluginClient *plugin.Client
|
|
userPid int
|
|
executor executor.Executor
|
|
isolationConfig *dstructs.IsolationConfig
|
|
|
|
taskDir string
|
|
allocDir *allocdir.AllocDir
|
|
killTimeout time.Duration
|
|
maxKillTimeout time.Duration
|
|
version string
|
|
logger *log.Logger
|
|
waitCh chan *dstructs.WaitResult
|
|
doneCh chan struct{}
|
|
}
|
|
|
|
// NewJavaDriver is used to create a new exec driver
|
|
func NewJavaDriver(ctx *DriverContext) Driver {
|
|
return &JavaDriver{DriverContext: *ctx}
|
|
}
|
|
|
|
// Validate is used to validate the driver configuration
|
|
func (d *JavaDriver) Validate(config map[string]interface{}) error {
|
|
fd := &fields.FieldData{
|
|
Raw: config,
|
|
Schema: map[string]*fields.FieldSchema{
|
|
"jar_path": &fields.FieldSchema{
|
|
Type: fields.TypeString,
|
|
Required: true,
|
|
},
|
|
"jvm_options": &fields.FieldSchema{
|
|
Type: fields.TypeArray,
|
|
},
|
|
"args": &fields.FieldSchema{
|
|
Type: fields.TypeArray,
|
|
},
|
|
},
|
|
}
|
|
|
|
if err := fd.Validate(); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (d *JavaDriver) Fingerprint(cfg *config.Config, node *structs.Node) (bool, error) {
|
|
// Get the current status so that we can log any debug messages only if the
|
|
// state changes
|
|
_, currentlyEnabled := node.Attributes[javaDriverAttr]
|
|
|
|
// Only enable if we are root and cgroups are mounted when running on linux systems.
|
|
if runtime.GOOS == "linux" && (syscall.Geteuid() != 0 || !d.cgroupsMounted(node)) {
|
|
if currentlyEnabled {
|
|
d.logger.Printf("[DEBUG] driver.java: root priviledges and mounted cgroups required on linux, disabling")
|
|
}
|
|
delete(node.Attributes, "driver.java")
|
|
return false, nil
|
|
}
|
|
|
|
// Find java version
|
|
var out bytes.Buffer
|
|
var erOut bytes.Buffer
|
|
cmd := exec.Command("java", "-version")
|
|
cmd.Stdout = &out
|
|
cmd.Stderr = &erOut
|
|
err := cmd.Run()
|
|
if err != nil {
|
|
// assume Java wasn't found
|
|
delete(node.Attributes, javaDriverAttr)
|
|
return false, nil
|
|
}
|
|
|
|
// 'java -version' returns output on Stderr typically.
|
|
// Check stdout, but it's probably empty
|
|
var infoString string
|
|
if out.String() != "" {
|
|
infoString = out.String()
|
|
}
|
|
|
|
if erOut.String() != "" {
|
|
infoString = erOut.String()
|
|
}
|
|
|
|
if infoString == "" {
|
|
if currentlyEnabled {
|
|
d.logger.Println("[WARN] driver.java: error parsing Java version information, aborting")
|
|
}
|
|
delete(node.Attributes, javaDriverAttr)
|
|
return false, nil
|
|
}
|
|
|
|
// Assume 'java -version' returns 3 lines:
|
|
// java version "1.6.0_36"
|
|
// OpenJDK Runtime Environment (IcedTea6 1.13.8) (6b36-1.13.8-0ubuntu1~12.04)
|
|
// OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)
|
|
// Each line is terminated by \n
|
|
info := strings.Split(infoString, "\n")
|
|
versionString := info[0]
|
|
versionString = strings.TrimPrefix(versionString, "java version ")
|
|
versionString = strings.Trim(versionString, "\"")
|
|
node.Attributes[javaDriverAttr] = "1"
|
|
node.Attributes["driver.java.version"] = versionString
|
|
node.Attributes["driver.java.runtime"] = info[1]
|
|
node.Attributes["driver.java.vm"] = info[2]
|
|
|
|
return true, nil
|
|
}
|
|
|
|
func (d *JavaDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
|
|
var driverConfig JavaDriverConfig
|
|
if err := mapstructure.WeakDecode(task.Config, &driverConfig); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Set the host environment variables.
|
|
filter := strings.Split(d.config.ReadDefault("env.blacklist", config.DefaultEnvBlacklist), ",")
|
|
d.taskEnv.AppendHostEnvvars(filter)
|
|
|
|
taskDir, ok := ctx.AllocDir.TaskDirs[d.DriverContext.taskName]
|
|
if !ok {
|
|
return nil, fmt.Errorf("Could not find task directory for task: %v", d.DriverContext.taskName)
|
|
}
|
|
|
|
if driverConfig.JarPath == "" {
|
|
return nil, fmt.Errorf("jar_path must be specified")
|
|
}
|
|
|
|
args := []string{}
|
|
// Look for jvm options
|
|
if len(driverConfig.JvmOpts) != 0 {
|
|
d.logger.Printf("[DEBUG] driver.java: found JVM options: %s", driverConfig.JvmOpts)
|
|
args = append(args, driverConfig.JvmOpts...)
|
|
}
|
|
|
|
// Build the argument list.
|
|
args = append(args, "-jar", driverConfig.JarPath)
|
|
if len(driverConfig.Args) != 0 {
|
|
args = append(args, driverConfig.Args...)
|
|
}
|
|
|
|
bin, err := discover.NomadExecutable()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("unable to find the nomad binary: %v", err)
|
|
}
|
|
|
|
pluginLogFile := filepath.Join(taskDir, fmt.Sprintf("%s-executor.out", task.Name))
|
|
pluginConfig := &plugin.ClientConfig{
|
|
Cmd: exec.Command(bin, "executor", pluginLogFile),
|
|
}
|
|
|
|
execIntf, pluginClient, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
executorCtx := &executor.ExecutorContext{
|
|
TaskEnv: d.taskEnv,
|
|
Driver: "java",
|
|
AllocDir: ctx.AllocDir,
|
|
AllocID: ctx.AllocID,
|
|
Task: task,
|
|
}
|
|
|
|
absPath, err := GetAbsolutePath("java")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
ps, err := execIntf.LaunchCmd(&executor.ExecCommand{
|
|
Cmd: absPath,
|
|
Args: args,
|
|
FSIsolation: true,
|
|
ResourceLimits: true,
|
|
User: getExecutorUser(task),
|
|
}, executorCtx)
|
|
if err != nil {
|
|
pluginClient.Kill()
|
|
return nil, err
|
|
}
|
|
d.logger.Printf("[DEBUG] driver.java: started process with pid: %v", ps.Pid)
|
|
|
|
// Return a driver handle
|
|
maxKill := d.DriverContext.config.MaxKillTimeout
|
|
h := &javaHandle{
|
|
pluginClient: pluginClient,
|
|
executor: execIntf,
|
|
userPid: ps.Pid,
|
|
isolationConfig: ps.IsolationConfig,
|
|
taskDir: taskDir,
|
|
allocDir: ctx.AllocDir,
|
|
killTimeout: GetKillTimeout(task.KillTimeout, maxKill),
|
|
maxKillTimeout: maxKill,
|
|
version: d.config.Version,
|
|
logger: d.logger,
|
|
doneCh: make(chan struct{}),
|
|
waitCh: make(chan *dstructs.WaitResult, 1),
|
|
}
|
|
if err := h.executor.SyncServices(consulContext(d.config, "")); err != nil {
|
|
d.logger.Printf("[ERR] driver.java: error registering services with consul for task: %q: %v", task.Name, err)
|
|
}
|
|
go h.run()
|
|
return h, nil
|
|
}
|
|
|
|
// cgroupsMounted returns true if the cgroups are mounted on a system otherwise
|
|
// returns false
|
|
func (d *JavaDriver) cgroupsMounted(node *structs.Node) bool {
|
|
_, ok := node.Attributes["unique.cgroup.mountpoint"]
|
|
return ok
|
|
}
|
|
|
|
type javaId struct {
|
|
Version string
|
|
KillTimeout time.Duration
|
|
MaxKillTimeout time.Duration
|
|
PluginConfig *PluginReattachConfig
|
|
IsolationConfig *dstructs.IsolationConfig
|
|
TaskDir string
|
|
AllocDir *allocdir.AllocDir
|
|
UserPid int
|
|
}
|
|
|
|
func (d *JavaDriver) Open(ctx *ExecContext, handleID string) (DriverHandle, error) {
|
|
id := &javaId{}
|
|
if err := json.Unmarshal([]byte(handleID), id); err != nil {
|
|
return nil, fmt.Errorf("Failed to parse handle '%s': %v", handleID, err)
|
|
}
|
|
|
|
pluginConfig := &plugin.ClientConfig{
|
|
Reattach: id.PluginConfig.PluginConfig(),
|
|
}
|
|
exec, pluginClient, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
|
|
if err != nil {
|
|
merrs := new(multierror.Error)
|
|
merrs.Errors = append(merrs.Errors, err)
|
|
d.logger.Println("[ERR] driver.java: error connecting to plugin so destroying plugin pid and user pid")
|
|
if e := destroyPlugin(id.PluginConfig.Pid, id.UserPid); e != nil {
|
|
merrs.Errors = append(merrs.Errors, fmt.Errorf("error destroying plugin and userpid: %v", e))
|
|
}
|
|
if id.IsolationConfig != nil {
|
|
isoConf := id.IsolationConfig
|
|
ePid := pluginConfig.Reattach.Pid
|
|
if e := executor.DestroyCgroup(isoConf.Cgroup, isoConf.CgroupPaths, ePid); e != nil {
|
|
merrs.Errors = append(merrs.Errors, fmt.Errorf("destroying cgroup failed: %v", e))
|
|
}
|
|
}
|
|
if e := ctx.AllocDir.UnmountAll(); e != nil {
|
|
merrs.Errors = append(merrs.Errors, e)
|
|
}
|
|
|
|
return nil, fmt.Errorf("error connecting to plugin: %v", merrs.ErrorOrNil())
|
|
}
|
|
|
|
ver, _ := exec.Version()
|
|
d.logger.Printf("[DEBUG] driver.java: version of executor: %v", ver.Version)
|
|
|
|
// Return a driver handle
|
|
h := &javaHandle{
|
|
pluginClient: pluginClient,
|
|
executor: exec,
|
|
userPid: id.UserPid,
|
|
isolationConfig: id.IsolationConfig,
|
|
taskDir: id.TaskDir,
|
|
allocDir: id.AllocDir,
|
|
logger: d.logger,
|
|
version: id.Version,
|
|
killTimeout: id.KillTimeout,
|
|
maxKillTimeout: id.MaxKillTimeout,
|
|
doneCh: make(chan struct{}),
|
|
waitCh: make(chan *dstructs.WaitResult, 1),
|
|
}
|
|
if err := h.executor.SyncServices(consulContext(d.config, "")); err != nil {
|
|
d.logger.Printf("[ERR] driver.java: error registering services with consul: %v", err)
|
|
}
|
|
|
|
go h.run()
|
|
return h, nil
|
|
}
|
|
|
|
func (h *javaHandle) ID() string {
|
|
id := javaId{
|
|
Version: h.version,
|
|
KillTimeout: h.killTimeout,
|
|
MaxKillTimeout: h.maxKillTimeout,
|
|
PluginConfig: NewPluginReattachConfig(h.pluginClient.ReattachConfig()),
|
|
UserPid: h.userPid,
|
|
TaskDir: h.taskDir,
|
|
AllocDir: h.allocDir,
|
|
IsolationConfig: h.isolationConfig,
|
|
}
|
|
|
|
data, err := json.Marshal(id)
|
|
if err != nil {
|
|
h.logger.Printf("[ERR] driver.java: failed to marshal ID to JSON: %s", err)
|
|
}
|
|
return string(data)
|
|
}
|
|
|
|
func (h *javaHandle) WaitCh() chan *dstructs.WaitResult {
|
|
return h.waitCh
|
|
}
|
|
|
|
func (h *javaHandle) Update(task *structs.Task) error {
|
|
// Store the updated kill timeout.
|
|
h.killTimeout = GetKillTimeout(task.KillTimeout, h.maxKillTimeout)
|
|
h.executor.UpdateTask(task)
|
|
|
|
// Update is not possible
|
|
return nil
|
|
}
|
|
|
|
func (h *javaHandle) Kill() error {
|
|
if err := h.executor.ShutDown(); err != nil {
|
|
if h.pluginClient.Exited() {
|
|
return nil
|
|
}
|
|
return fmt.Errorf("executor Shutdown failed: %v", err)
|
|
}
|
|
|
|
select {
|
|
case <-h.doneCh:
|
|
return nil
|
|
case <-time.After(h.killTimeout):
|
|
if h.pluginClient.Exited() {
|
|
return nil
|
|
}
|
|
if err := h.executor.Exit(); err != nil {
|
|
return fmt.Errorf("executor Exit failed: %v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func (h *javaHandle) Stats() (*cstructs.TaskResourceUsage, error) {
|
|
return h.executor.Stats()
|
|
}
|
|
|
|
func (h *javaHandle) run() {
|
|
ps, err := h.executor.Wait()
|
|
close(h.doneCh)
|
|
if ps.ExitCode == 0 && err != nil {
|
|
if h.isolationConfig != nil {
|
|
isoConf := h.isolationConfig
|
|
ePid := h.pluginClient.ReattachConfig().Pid
|
|
if e := executor.DestroyCgroup(isoConf.Cgroup, isoConf.CgroupPaths, ePid); e != nil {
|
|
h.logger.Printf("[ERR] driver.java: destroying cgroup failed while killing cgroup: %v", e)
|
|
}
|
|
} else {
|
|
if e := killProcess(h.userPid); e != nil {
|
|
h.logger.Printf("[ERR] driver.java: error killing user process: %v", e)
|
|
}
|
|
}
|
|
if e := h.allocDir.UnmountAll(); e != nil {
|
|
h.logger.Printf("[ERR] driver.java: unmounting dev,proc and alloc dirs failed: %v", e)
|
|
}
|
|
}
|
|
h.waitCh <- &dstructs.WaitResult{ExitCode: ps.ExitCode, Signal: ps.Signal, Err: err}
|
|
close(h.waitCh)
|
|
|
|
// Remove services
|
|
if err := h.executor.DeregisterServices(); err != nil {
|
|
h.logger.Printf("[ERR] driver.java: failed to kill the deregister services: %v", err)
|
|
}
|
|
|
|
h.executor.Exit()
|
|
h.pluginClient.Kill()
|
|
}
|