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driver.go
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driver.go
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package java
import (
"context"
"fmt"
"os"
"os/exec"
"path/filepath"
"runtime"
"time"
"github.com/hashicorp/consul-template/signals"
hclog "github.com/hashicorp/go-hclog"
"github.com/hashicorp/nomad/client/fingerprint"
"github.com/hashicorp/nomad/drivers/shared/eventer"
"github.com/hashicorp/nomad/drivers/shared/executor"
"github.com/hashicorp/nomad/helper/pluginutils/loader"
"github.com/hashicorp/nomad/plugins/base"
"github.com/hashicorp/nomad/plugins/drivers"
"github.com/hashicorp/nomad/plugins/drivers/utils"
"github.com/hashicorp/nomad/plugins/shared/hclspec"
pstructs "github.com/hashicorp/nomad/plugins/shared/structs"
)
const (
// pluginName is the name of the plugin
pluginName = "java"
// fingerprintPeriod is the interval at which the driver will send fingerprint responses
fingerprintPeriod = 30 * time.Second
// The key populated in Node Attributes to indicate presence of the Java driver
driverAttr = "driver.java"
driverVersionAttr = "driver.java.version"
// taskHandleVersion is the version of task handle which this driver sets
// and understands how to decode driver state
taskHandleVersion = 1
)
var (
// PluginID is the java plugin metadata registered in the plugin
// catalog.
PluginID = loader.PluginID{
Name: pluginName,
PluginType: base.PluginTypeDriver,
}
// PluginConfig is the java driver factory function registered in the
// plugin catalog.
PluginConfig = &loader.InternalPluginConfig{
Config: map[string]interface{}{},
Factory: func(l hclog.Logger) interface{} { return NewDriver(l) },
}
// pluginInfo is the response returned for the PluginInfo RPC
pluginInfo = &base.PluginInfoResponse{
Type: base.PluginTypeDriver,
PluginApiVersions: []string{drivers.ApiVersion010},
PluginVersion: "0.1.0",
Name: pluginName,
}
// configSpec is the hcl specification returned by the ConfigSchema RPC
configSpec = hclspec.NewObject(map[string]*hclspec.Spec{})
// taskConfigSpec is the hcl specification for the driver config section of
// a taskConfig within a job. It is returned in the TaskConfigSchema RPC
taskConfigSpec = hclspec.NewObject(map[string]*hclspec.Spec{
// It's required for either `class` or `jar_path` to be set,
// but that's not expressable in hclspec. Marking both as optional
// and setting checking explicitly later
"class": hclspec.NewAttr("class", "string", false),
"class_path": hclspec.NewAttr("class_path", "string", false),
"jar_path": hclspec.NewAttr("jar_path", "string", false),
"jvm_options": hclspec.NewAttr("jvm_options", "list(string)", false),
"args": hclspec.NewAttr("args", "list(string)", false),
})
// capabilities is returned by the Capabilities RPC and indicates what
// optional features this driver supports
capabilities = &drivers.Capabilities{
SendSignals: false,
Exec: false,
FSIsolation: drivers.FSIsolationNone,
}
_ drivers.DriverPlugin = (*Driver)(nil)
)
func init() {
if runtime.GOOS == "linux" {
capabilities.FSIsolation = drivers.FSIsolationChroot
}
}
// TaskConfig is the driver configuration of a taskConfig within a job
type TaskConfig struct {
Class string `codec:"class"`
ClassPath string `codec:"class_path"`
JarPath string `codec:"jar_path"`
JvmOpts []string `codec:"jvm_options"`
Args []string `codec:"args"` // extra arguments to java executable
}
// TaskState is the state which is encoded in the handle returned in
// StartTask. This information is needed to rebuild the taskConfig state and handler
// during recovery.
type TaskState struct {
ReattachConfig *pstructs.ReattachConfig
TaskConfig *drivers.TaskConfig
Pid int
StartedAt time.Time
}
// Driver is a driver for running images via Java
type Driver struct {
// eventer is used to handle multiplexing of TaskEvents calls such that an
// event can be broadcast to all callers
eventer *eventer.Eventer
// tasks is the in memory datastore mapping taskIDs to taskHandle
tasks *taskStore
// ctx is the context for the driver. It is passed to other subsystems to
// coordinate shutdown
ctx context.Context
// nomadConf is the client agent's configuration
nomadConfig *base.ClientDriverConfig
// signalShutdown is called when the driver is shutting down and cancels the
// ctx passed to any subsystems
signalShutdown context.CancelFunc
// logger will log to the Nomad agent
logger hclog.Logger
}
func NewDriver(logger hclog.Logger) drivers.DriverPlugin {
ctx, cancel := context.WithCancel(context.Background())
logger = logger.Named(pluginName)
return &Driver{
eventer: eventer.NewEventer(ctx, logger),
tasks: newTaskStore(),
ctx: ctx,
signalShutdown: cancel,
logger: logger,
}
}
func (d *Driver) PluginInfo() (*base.PluginInfoResponse, error) {
return pluginInfo, nil
}
func (d *Driver) ConfigSchema() (*hclspec.Spec, error) {
return configSpec, nil
}
func (d *Driver) SetConfig(cfg *base.Config) error {
if cfg != nil && cfg.AgentConfig != nil {
d.nomadConfig = cfg.AgentConfig.Driver
}
return nil
}
func (d *Driver) TaskConfigSchema() (*hclspec.Spec, error) {
return taskConfigSpec, nil
}
func (d *Driver) Capabilities() (*drivers.Capabilities, error) {
return capabilities, nil
}
func (d *Driver) Fingerprint(ctx context.Context) (<-chan *drivers.Fingerprint, error) {
ch := make(chan *drivers.Fingerprint)
go d.handleFingerprint(ctx, ch)
return ch, nil
}
func (d *Driver) handleFingerprint(ctx context.Context, ch chan *drivers.Fingerprint) {
ticker := time.NewTimer(0)
for {
select {
case <-ctx.Done():
return
case <-d.ctx.Done():
return
case <-ticker.C:
ticker.Reset(fingerprintPeriod)
ch <- d.buildFingerprint()
}
}
}
func (d *Driver) buildFingerprint() *drivers.Fingerprint {
fp := &drivers.Fingerprint{
Attributes: map[string]*pstructs.Attribute{},
Health: drivers.HealthStateHealthy,
HealthDescription: drivers.DriverHealthy,
}
if runtime.GOOS == "linux" {
// Only enable if w are root and cgroups are mounted when running on linux system
if !utils.IsUnixRoot() {
fp.Health = drivers.HealthStateUndetected
fp.HealthDescription = drivers.DriverRequiresRootMessage
return fp
}
mount, err := fingerprint.FindCgroupMountpointDir()
if err != nil {
fp.Health = drivers.HealthStateUnhealthy
fp.HealthDescription = drivers.NoCgroupMountMessage
d.logger.Warn(fp.HealthDescription, "error", err)
return fp
}
if mount == "" {
fp.Health = drivers.HealthStateUnhealthy
fp.HealthDescription = drivers.CgroupMountEmpty
return fp
}
}
version, runtime, vm, err := javaVersionInfo()
if err != nil {
// return no error, as it isn't an error to not find java, it just means we
// can't use it.
fp.Health = drivers.HealthStateUndetected
fp.HealthDescription = ""
return fp
}
fp.Attributes[driverAttr] = pstructs.NewBoolAttribute(true)
fp.Attributes[driverVersionAttr] = pstructs.NewStringAttribute(version)
fp.Attributes["driver.java.runtime"] = pstructs.NewStringAttribute(runtime)
fp.Attributes["driver.java.vm"] = pstructs.NewStringAttribute(vm)
return fp
}
func (d *Driver) RecoverTask(handle *drivers.TaskHandle) error {
if handle == nil {
return fmt.Errorf("handle cannot be nil")
}
// COMPAT(0.10): pre 0.9 upgrade path check
if handle.Version == 0 {
return d.recoverPre09Task(handle)
}
// If already attached to handle there's nothing to recover.
if _, ok := d.tasks.Get(handle.Config.ID); ok {
d.logger.Debug("nothing to recover; task already exists",
"task_id", handle.Config.ID,
"task_name", handle.Config.Name,
)
return nil
}
var taskState TaskState
if err := handle.GetDriverState(&taskState); err != nil {
d.logger.Error("failed to decode taskConfig state from handle", "error", err, "task_id", handle.Config.ID)
return fmt.Errorf("failed to decode taskConfig state from handle: %v", err)
}
plugRC, err := pstructs.ReattachConfigToGoPlugin(taskState.ReattachConfig)
if err != nil {
d.logger.Error("failed to build ReattachConfig from taskConfig state", "error", err, "task_id", handle.Config.ID)
return fmt.Errorf("failed to build ReattachConfig from taskConfig state: %v", err)
}
execImpl, pluginClient, err := executor.ReattachToExecutor(plugRC,
d.logger.With("task_name", handle.Config.Name, "alloc_id", handle.Config.AllocID))
if err != nil {
d.logger.Error("failed to reattach to executor", "error", err, "task_id", handle.Config.ID)
return fmt.Errorf("failed to reattach to executor: %v", err)
}
h := &taskHandle{
exec: execImpl,
pid: taskState.Pid,
pluginClient: pluginClient,
taskConfig: taskState.TaskConfig,
procState: drivers.TaskStateRunning,
startedAt: taskState.StartedAt,
exitResult: &drivers.ExitResult{},
}
d.tasks.Set(taskState.TaskConfig.ID, h)
go h.run()
return nil
}
func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drivers.DriverNetwork, error) {
if _, ok := d.tasks.Get(cfg.ID); ok {
return nil, nil, fmt.Errorf("task with ID %q already started", cfg.ID)
}
var driverConfig TaskConfig
if err := cfg.DecodeDriverConfig(&driverConfig); err != nil {
return nil, nil, fmt.Errorf("failed to decode driver config: %v", err)
}
if driverConfig.Class == "" && driverConfig.JarPath == "" {
return nil, nil, fmt.Errorf("jar_path or class must be specified")
}
absPath, err := GetAbsolutePath("java")
if err != nil {
return nil, nil, fmt.Errorf("failed to find java binary: %s", err)
}
args := javaCmdArgs(driverConfig)
d.logger.Info("starting java task", "driver_cfg", hclog.Fmt("%+v", driverConfig), "args", args)
handle := drivers.NewTaskHandle(taskHandleVersion)
handle.Config = cfg
pluginLogFile := filepath.Join(cfg.TaskDir().Dir, "executor.out")
executorConfig := &executor.ExecutorConfig{
LogFile: pluginLogFile,
LogLevel: "debug",
FSIsolation: capabilities.FSIsolation == drivers.FSIsolationChroot,
}
exec, pluginClient, err := executor.CreateExecutor(
d.logger.With("task_name", handle.Config.Name, "alloc_id", handle.Config.AllocID),
d.nomadConfig, executorConfig)
if err != nil {
return nil, nil, fmt.Errorf("failed to create executor: %v", err)
}
user := cfg.User
if user == "" {
user = "nobody"
}
execCmd := &executor.ExecCommand{
Cmd: absPath,
Args: args,
Env: cfg.EnvList(),
User: user,
ResourceLimits: true,
Resources: cfg.Resources,
TaskDir: cfg.TaskDir().Dir,
StdoutPath: cfg.StdoutPath,
StderrPath: cfg.StderrPath,
Mounts: cfg.Mounts,
Devices: cfg.Devices,
}
ps, err := exec.Launch(execCmd)
if err != nil {
pluginClient.Kill()
return nil, nil, fmt.Errorf("failed to launch command with executor: %v", err)
}
h := &taskHandle{
exec: exec,
pid: ps.Pid,
pluginClient: pluginClient,
taskConfig: cfg,
procState: drivers.TaskStateRunning,
startedAt: time.Now().Round(time.Millisecond),
logger: d.logger,
}
driverState := TaskState{
ReattachConfig: pstructs.ReattachConfigFromGoPlugin(pluginClient.ReattachConfig()),
Pid: ps.Pid,
TaskConfig: cfg,
StartedAt: h.startedAt,
}
if err := handle.SetDriverState(&driverState); err != nil {
d.logger.Error("failed to start task, error setting driver state", "error", err)
exec.Shutdown("", 0)
pluginClient.Kill()
return nil, nil, fmt.Errorf("failed to set driver state: %v", err)
}
d.tasks.Set(cfg.ID, h)
go h.run()
return handle, nil, nil
}
func javaCmdArgs(driverConfig TaskConfig) []string {
args := []string{}
// Look for jvm options
if len(driverConfig.JvmOpts) != 0 {
args = append(args, driverConfig.JvmOpts...)
}
// Add the classpath
if driverConfig.ClassPath != "" {
args = append(args, "-cp", driverConfig.ClassPath)
}
// Add the jar
if driverConfig.JarPath != "" {
args = append(args, "-jar", driverConfig.JarPath)
}
// Add the class
if driverConfig.Class != "" {
args = append(args, driverConfig.Class)
}
// Add any args
if len(driverConfig.Args) != 0 {
args = append(args, driverConfig.Args...)
}
return args
}
func (d *Driver) WaitTask(ctx context.Context, taskID string) (<-chan *drivers.ExitResult, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
ch := make(chan *drivers.ExitResult)
go d.handleWait(ctx, handle, ch)
return ch, nil
}
func (d *Driver) handleWait(ctx context.Context, handle *taskHandle, ch chan *drivers.ExitResult) {
defer close(ch)
var result *drivers.ExitResult
ps, err := handle.exec.Wait(ctx)
if err != nil {
result = &drivers.ExitResult{
Err: fmt.Errorf("executor: error waiting on process: %v", err),
}
} else {
result = &drivers.ExitResult{
ExitCode: ps.ExitCode,
Signal: ps.Signal,
}
}
select {
case <-ctx.Done():
return
case <-d.ctx.Done():
return
case ch <- result:
}
}
func (d *Driver) StopTask(taskID string, timeout time.Duration, signal string) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
if err := handle.exec.Shutdown(signal, timeout); err != nil {
if handle.pluginClient.Exited() {
return nil
}
return fmt.Errorf("executor Shutdown failed: %v", err)
}
return nil
}
func (d *Driver) DestroyTask(taskID string, force bool) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
if handle.IsRunning() && !force {
return fmt.Errorf("cannot destroy running task")
}
if !handle.pluginClient.Exited() {
if handle.IsRunning() {
if err := handle.exec.Shutdown("", 0); err != nil {
handle.logger.Error("destroying executor failed", "err", err)
}
}
handle.pluginClient.Kill()
}
d.tasks.Delete(taskID)
return nil
}
func (d *Driver) InspectTask(taskID string) (*drivers.TaskStatus, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
return handle.TaskStatus(), nil
}
func (d *Driver) TaskStats(ctx context.Context, taskID string, interval time.Duration) (<-chan *drivers.TaskResourceUsage, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
return handle.exec.Stats(ctx, interval)
}
func (d *Driver) TaskEvents(ctx context.Context) (<-chan *drivers.TaskEvent, error) {
return d.eventer.TaskEvents(ctx)
}
func (d *Driver) SignalTask(taskID string, signal string) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
sig := os.Interrupt
if s, ok := signals.SignalLookup[signal]; ok {
sig = s
} else {
d.logger.Warn("unknown signal to send to task, using SIGINT instead", "signal", signal, "task_id", handle.taskConfig.ID)
}
return handle.exec.Signal(sig)
}
func (d *Driver) ExecTask(taskID string, cmd []string, timeout time.Duration) (*drivers.ExecTaskResult, error) {
if len(cmd) == 0 {
return nil, fmt.Errorf("error cmd must have at least one value")
}
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
out, exitCode, err := handle.exec.Exec(time.Now().Add(timeout), cmd[0], cmd[1:])
if err != nil {
return nil, err
}
return &drivers.ExecTaskResult{
Stdout: out,
ExitResult: &drivers.ExitResult{
ExitCode: exitCode,
},
}, nil
}
var _ drivers.ExecTaskStreamingRawDriver = (*Driver)(nil)
func (d *Driver) ExecTaskStreamingRaw(ctx context.Context,
taskID string,
command []string,
tty bool,
stream drivers.ExecTaskStream) error {
if len(command) == 0 {
return fmt.Errorf("error cmd must have at least one value")
}
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
return handle.exec.ExecStreaming(ctx, command, tty, stream)
}
// GetAbsolutePath returns the absolute path of the passed binary by resolving
// it in the path and following symlinks.
func GetAbsolutePath(bin string) (string, error) {
lp, err := exec.LookPath(bin)
if err != nil {
return "", fmt.Errorf("failed to resolve path to %q executable: %v", bin, err)
}
return filepath.EvalSymlinks(lp)
}
func (d *Driver) Shutdown() {
d.signalShutdown()
}