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java.go
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java.go
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package driver
import (
"bytes"
"fmt"
"os/exec"
"path/filepath"
"runtime"
"strings"
"syscall"
"time"
"github.com/hashicorp/nomad/client/allocdir"
"github.com/hashicorp/nomad/client/config"
"github.com/hashicorp/nomad/client/driver/executor"
cstructs "github.com/hashicorp/nomad/client/driver/structs"
"github.com/hashicorp/nomad/client/fingerprint"
"github.com/hashicorp/nomad/client/getter"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/mitchellh/mapstructure"
)
// 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 {
JvmOpts []string `mapstructure:"jvm_options"`
ArtifactSource string `mapstructure:"artifact_source"`
Checksum string `mapstructure:"checksum"`
Args []string `mapstructure:"args"`
}
// javaHandle is returned from Start/Open as a handle to the PID
type javaHandle struct {
cmd executor.Executor
waitCh chan *cstructs.WaitResult
doneCh chan struct{}
}
// NewJavaDriver is used to create a new exec driver
func NewJavaDriver(ctx *DriverContext) Driver {
return &JavaDriver{DriverContext: *ctx}
}
func (d *JavaDriver) Fingerprint(cfg *config.Config, node *structs.Node) (bool, error) {
// Only enable if we are root when running on non-windows systems.
if runtime.GOOS == "linux" && syscall.Geteuid() != 0 {
d.logger.Printf("[DEBUG] driver.java: must run as root user on linux, disabling")
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
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 == "" {
d.logger.Println("[WARN] driver.java: error parsing Java version information, aborting")
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["driver.java"] = "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
}
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)
}
// Proceed to download an artifact to be executed.
path, err := getter.GetArtifact(
filepath.Join(taskDir, allocdir.TaskLocal),
driverConfig.ArtifactSource,
driverConfig.Checksum,
d.logger,
)
if err != nil {
return nil, err
}
jarName := filepath.Base(path)
// Get the environment variables.
envVars := TaskEnvironmentVariables(ctx, task)
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", filepath.Join(allocdir.TaskLocal, jarName))
if len(driverConfig.Args) != 0 {
args = append(args, driverConfig.Args...)
}
// Setup the command
// Assumes Java is in the $PATH, but could probably be detected
cmd := executor.Command("java", args...)
// Populate environment variables
cmd.Command().Env = envVars.List()
if err := cmd.Limit(task.Resources); err != nil {
return nil, fmt.Errorf("failed to constrain resources: %s", err)
}
if err := cmd.ConfigureTaskDir(d.taskName, ctx.AllocDir); err != nil {
return nil, fmt.Errorf("failed to configure task directory: %v", err)
}
if err := cmd.Start(); err != nil {
return nil, fmt.Errorf("failed to start source: %v", err)
}
// Return a driver handle
h := &javaHandle{
cmd: cmd,
doneCh: make(chan struct{}),
waitCh: make(chan *cstructs.WaitResult, 1),
}
go h.run()
return h, nil
}
func (d *JavaDriver) Open(ctx *ExecContext, handleID string) (DriverHandle, error) {
// Find the process
cmd, err := executor.OpenId(handleID)
if err != nil {
return nil, fmt.Errorf("failed to open ID %v: %v", handleID, err)
}
// Return a driver handle
h := &javaHandle{
cmd: cmd,
doneCh: make(chan struct{}),
waitCh: make(chan *cstructs.WaitResult, 1),
}
go h.run()
return h, nil
}
func (h *javaHandle) ID() string {
id, _ := h.cmd.ID()
return id
}
func (h *javaHandle) WaitCh() chan *cstructs.WaitResult {
return h.waitCh
}
func (h *javaHandle) Update(task *structs.Task) error {
// Update is not possible
return nil
}
func (h *javaHandle) Kill() error {
h.cmd.Shutdown()
select {
case <-h.doneCh:
return nil
case <-time.After(5 * time.Second):
return h.cmd.ForceStop()
}
}
func (h *javaHandle) run() {
res := h.cmd.Wait()
close(h.doneCh)
h.waitCh <- res
close(h.waitCh)
}