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driver.go
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driver.go
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package mock
import (
"context"
"errors"
"fmt"
"io/ioutil"
"math/rand"
"strconv"
"strings"
"sync"
"time"
hclog "github.com/hashicorp/go-hclog"
"github.com/hashicorp/nomad/drivers/shared/eventer"
"github.com/hashicorp/nomad/helper/pluginutils/loader"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/hashicorp/nomad/plugins/base"
"github.com/hashicorp/nomad/plugins/drivers"
"github.com/hashicorp/nomad/plugins/shared/hclspec"
pstructs "github.com/hashicorp/nomad/plugins/shared/structs"
)
const (
// pluginName is the name of the plugin
pluginName = "mock_driver"
// fingerprintPeriod is the interval at which the driver will send fingerprint responses
fingerprintPeriod = 500 * time.Millisecond
// taskHandleVersion is the version of task handle which this driver sets
// and understands how to decode driver state
taskHandleVersion = 1
)
var (
// PluginID is the mock driver plugin metadata registered in the plugin
// catalog.
PluginID = loader.PluginID{
Name: pluginName,
PluginType: base.PluginTypeDriver,
}
// PluginConfig is the mock driver factory function registered in the
// plugin catalog.
PluginConfig = &loader.InternalPluginConfig{
Config: map[string]interface{}{},
Factory: func(l hclog.Logger) interface{} { return NewMockDriver(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{
"fs_isolation": hclspec.NewDefault(
hclspec.NewAttr("fs_isolation", "string", false),
hclspec.NewLiteral(fmt.Sprintf("%q", drivers.FSIsolationNone)),
),
"shutdown_periodic_after": hclspec.NewDefault(
hclspec.NewAttr("shutdown_periodic_after", "bool", false),
hclspec.NewLiteral("false"),
),
"shutdown_periodic_duration": hclspec.NewAttr("shutdown_periodic_duration", "number", false),
})
// taskConfigSpec is the hcl specification for the driver config section of
// a task within a job. It is returned in the TaskConfigSchema RPC
taskConfigSpec = hclspec.NewObject(map[string]*hclspec.Spec{
"start_error": hclspec.NewAttr("start_error", "string", false),
"start_error_recoverable": hclspec.NewAttr("start_error_recoverable", "bool", false),
"start_block_for": hclspec.NewAttr("start_block_for", "string", false),
"kill_after": hclspec.NewAttr("kill_after", "string", false),
"plugin_exit_after": hclspec.NewAttr("plugin_exit_after", "string", false),
"driver_ip": hclspec.NewAttr("driver_ip", "string", false),
"driver_advertise": hclspec.NewAttr("driver_advertise", "bool", false),
"driver_port_map": hclspec.NewAttr("driver_port_map", "string", false),
"run_for": hclspec.NewAttr("run_for", "string", false),
"exit_code": hclspec.NewAttr("exit_code", "number", false),
"exit_signal": hclspec.NewAttr("exit_signal", "number", false),
"exit_err_msg": hclspec.NewAttr("exit_err_msg", "string", false),
"signal_error": hclspec.NewAttr("signal_error", "string", false),
"stdout_string": hclspec.NewAttr("stdout_string", "string", false),
"stdout_repeat": hclspec.NewAttr("stdout_repeat", "number", false),
"stdout_repeat_duration": hclspec.NewAttr("stdout_repeat_duration", "string", false),
"stderr_string": hclspec.NewAttr("stderr_string", "string", false),
"stderr_repeat": hclspec.NewAttr("stderr_repeat", "number", false),
"stderr_repeat_duration": hclspec.NewAttr("stderr_repeat_duration", "string", false),
"exec_command": hclspec.NewBlock("exec_command", false, hclspec.NewObject(map[string]*hclspec.Spec{
"run_for": hclspec.NewAttr("run_for", "string", false),
"exit_code": hclspec.NewAttr("exit_code", "number", false),
"exit_signal": hclspec.NewAttr("exit_signal", "number", false),
"exit_err_msg": hclspec.NewAttr("exit_err_msg", "string", false),
"signal_error": hclspec.NewAttr("signal_error", "string", false),
"stdout_string": hclspec.NewAttr("stdout_string", "string", false),
"stdout_repeat": hclspec.NewAttr("stdout_repeat", "number", false),
"stdout_repeat_duration": hclspec.NewAttr("stdout_repeat_duration", "string", false),
"stderr_string": hclspec.NewAttr("stderr_string", "string", false),
"stderr_repeat": hclspec.NewAttr("stderr_repeat", "number", false),
"stderr_repeat_duration": hclspec.NewAttr("stderr_repeat_duration", "string", false),
})),
})
)
// Driver is a mock DriverPlugin implementation
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
// capabilities is returned by the Capabilities RPC and indicates what
// optional features this driver supports
capabilities *drivers.Capabilities
// config is the driver configuration set by the SetConfig RPC
config *Config
// tasks is the in memory datastore mapping taskIDs to mockDriverHandles
tasks *taskStore
// ctx is the context for the driver. It is passed to other subsystems to
// coordinate shutdown
ctx context.Context
// signalShutdown is called when the driver is shutting down and cancels the
// ctx passed to any subsystems
signalShutdown context.CancelFunc
shutdownFingerprintTime time.Time
// lastDriverTaskConfig is the last *drivers.TaskConfig passed to StartTask
lastDriverTaskConfig *drivers.TaskConfig
// lastTaskConfig is the last decoded *TaskConfig created by StartTask
lastTaskConfig *TaskConfig
// lastMu guards access to last[Driver]TaskConfig
lastMu sync.Mutex
// logger will log to the Nomad agent
logger hclog.Logger
}
// NewMockDriver returns a new DriverPlugin implementation
func NewMockDriver(logger hclog.Logger) drivers.DriverPlugin {
ctx, cancel := context.WithCancel(context.Background())
logger = logger.Named(pluginName)
capabilities := &drivers.Capabilities{
SendSignals: true,
Exec: true,
FSIsolation: drivers.FSIsolationNone,
}
return &Driver{
eventer: eventer.NewEventer(ctx, logger),
capabilities: capabilities,
config: &Config{},
tasks: newTaskStore(),
ctx: ctx,
signalShutdown: cancel,
logger: logger,
}
}
// Config is the configuration for the driver that applies to all tasks
type Config struct {
FSIsolation string `codec:"fs_isolation"`
// ShutdownPeriodicAfter is a toggle that can be used during tests to
// "stop" a previously-functioning driver, allowing for testing of periodic
// drivers and fingerprinters
ShutdownPeriodicAfter bool `codec:"shutdown_periodic_after"`
// ShutdownPeriodicDuration is a option that can be used during tests
// to "stop" a previously functioning driver after the specified duration
// for testing of periodic drivers and fingerprinters.
ShutdownPeriodicDuration time.Duration `codec:"shutdown_periodic_duration"`
}
type Command struct {
// RunFor is the duration for which the fake task runs for. After this
// period the MockDriver responds to the task running indicating that the
// task has terminated
RunFor string `codec:"run_for"`
runForDuration time.Duration
// ExitCode is the exit code with which the MockDriver indicates the task
// has exited
ExitCode int `codec:"exit_code"`
// ExitSignal is the signal with which the MockDriver indicates the task has
// been killed
ExitSignal int `codec:"exit_signal"`
// ExitErrMsg is the error message that the task returns while exiting
ExitErrMsg string `codec:"exit_err_msg"`
// SignalErr is the error message that the task returns if signalled
SignalErr string `codec:"signal_error"`
// StdoutString is the string that should be sent to stdout
StdoutString string `codec:"stdout_string"`
// StdoutRepeat is the number of times the output should be sent.
StdoutRepeat int `codec:"stdout_repeat"`
// StdoutRepeatDur is the duration between repeated outputs.
StdoutRepeatDur string `codec:"stdout_repeat_duration"`
stdoutRepeatDuration time.Duration
// StderrString is the string that should be sent to stderr
StderrString string `codec:"stderr_string"`
// StderrRepeat is the number of times the errput should be sent.
StderrRepeat int `codec:"stderr_repeat"`
// StderrRepeatDur is the duration between repeated errputs.
StderrRepeatDur string `codec:"stderr_repeat_duration"`
stderrRepeatDuration time.Duration
}
// TaskConfig is the driver configuration of a task within a job
type TaskConfig struct {
Command
ExecCommand *Command `codec:"exec_command"`
// PluginExitAfter is the duration after which the mock driver indicates the
// plugin has exited via the WaitTask call.
PluginExitAfter string `codec:"plugin_exit_after"`
pluginExitAfterDuration time.Duration
// StartErr specifies the error that should be returned when starting the
// mock driver.
StartErr string `codec:"start_error"`
// StartErrRecoverable marks the error returned is recoverable
StartErrRecoverable bool `codec:"start_error_recoverable"`
// StartBlockFor specifies a duration in which to block before returning
StartBlockFor string `codec:"start_block_for"`
startBlockForDuration time.Duration
// KillAfter is the duration after which the mock driver indicates the task
// has exited after getting the initial SIGINT signal
KillAfter string `codec:"kill_after"`
killAfterDuration time.Duration
// DriverIP will be returned as the DriverNetwork.IP from Start()
DriverIP string `codec:"driver_ip"`
// DriverAdvertise will be returned as DriverNetwork.AutoAdvertise from
// Start().
DriverAdvertise bool `codec:"driver_advertise"`
// DriverPortMap will parse a label:number pair and return it in
// DriverNetwork.PortMap from Start().
DriverPortMap string `codec:"driver_port_map"`
}
type MockTaskState struct {
StartedAt time.Time
}
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 {
var config Config
if len(cfg.PluginConfig) != 0 {
if err := base.MsgPackDecode(cfg.PluginConfig, &config); err != nil {
return err
}
}
d.config = &config
if d.config.ShutdownPeriodicAfter {
d.shutdownFingerprintTime = time.Now().Add(d.config.ShutdownPeriodicDuration)
}
isolation := config.FSIsolation
if isolation != "" {
d.capabilities.FSIsolation = drivers.FSIsolation(isolation)
}
return nil
}
func (d *Driver) TaskConfigSchema() (*hclspec.Spec, error) {
return taskConfigSpec, nil
}
func (d *Driver) Capabilities() (*drivers.Capabilities, error) {
return d.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 {
var health drivers.HealthState
var desc string
attrs := map[string]*pstructs.Attribute{}
if !d.shutdownFingerprintTime.IsZero() && time.Now().After(d.shutdownFingerprintTime) {
health = drivers.HealthStateUndetected
desc = "disabled"
} else {
health = drivers.HealthStateHealthy
attrs["driver.mock"] = pstructs.NewBoolAttribute(true)
desc = drivers.DriverHealthy
}
return &drivers.Fingerprint{
Attributes: attrs,
Health: health,
HealthDescription: desc,
}
}
func (d *Driver) RecoverTask(handle *drivers.TaskHandle) error {
if handle == nil {
return fmt.Errorf("handle cannot be nil")
}
// Unmarshall the driver state and create a new handle
var taskState MockTaskState
if err := handle.GetDriverState(&taskState); err != nil {
d.logger.Error("failed to decode task state from handle", "error", err, "task_id", handle.Config.ID)
return fmt.Errorf("failed to decode task state from handle: %v", err)
}
driverCfg, err := parseDriverConfig(handle.Config)
if err != nil {
d.logger.Error("failed to parse driver config from handle", "error", err, "task_id", handle.Config.ID, "config", hclog.Fmt("%+v", handle.Config))
return fmt.Errorf("failed to parse driver config from handle: %v", err)
}
// Remove the plugin exit time if set
driverCfg.pluginExitAfterDuration = 0
// Correct the run_for time based on how long it has already been running
now := time.Now()
driverCfg.runForDuration = driverCfg.runForDuration - now.Sub(taskState.StartedAt)
h := newTaskHandle(handle.Config, driverCfg, d.logger)
h.Recovered = true
d.tasks.Set(handle.Config.ID, h)
go h.run()
return nil
}
func (c *Command) parseDurations() error {
var err error
if c.runForDuration, err = parseDuration(c.RunFor); err != nil {
return fmt.Errorf("run_for %v not a valid duration: %v", c.RunFor, err)
}
if c.stdoutRepeatDuration, err = parseDuration(c.StdoutRepeatDur); err != nil {
return fmt.Errorf("stdout_repeat_duration %v not a valid duration: %v", c.stdoutRepeatDuration, err)
}
if c.stderrRepeatDuration, err = parseDuration(c.StderrRepeatDur); err != nil {
return fmt.Errorf("stderr_repeat_duration %v not a valid duration: %v", c.stderrRepeatDuration, err)
}
return nil
}
func parseDriverConfig(cfg *drivers.TaskConfig) (*TaskConfig, error) {
var driverConfig TaskConfig
if err := cfg.DecodeDriverConfig(&driverConfig); err != nil {
return nil, err
}
var err error
if driverConfig.startBlockForDuration, err = parseDuration(driverConfig.StartBlockFor); err != nil {
return nil, fmt.Errorf("start_block_for %v not a valid duration: %v", driverConfig.StartBlockFor, err)
}
if driverConfig.pluginExitAfterDuration, err = parseDuration(driverConfig.PluginExitAfter); err != nil {
return nil, fmt.Errorf("plugin_exit_after %v not a valid duration: %v", driverConfig.PluginExitAfter, err)
}
if err = driverConfig.parseDurations(); err != nil {
return nil, err
}
if driverConfig.ExecCommand != nil {
if err = driverConfig.ExecCommand.parseDurations(); err != nil {
return nil, err
}
}
return &driverConfig, nil
}
func newTaskHandle(cfg *drivers.TaskConfig, driverConfig *TaskConfig, logger hclog.Logger) *taskHandle {
killCtx, killCancel := context.WithCancel(context.Background())
h := &taskHandle{
taskConfig: cfg,
command: driverConfig.Command,
execCommand: driverConfig.ExecCommand,
pluginExitAfter: driverConfig.pluginExitAfterDuration,
killAfter: driverConfig.killAfterDuration,
logger: logger.With("task_name", cfg.Name),
waitCh: make(chan interface{}),
killCh: killCtx.Done(),
kill: killCancel,
startedAt: time.Now(),
}
return h
}
func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drivers.DriverNetwork, error) {
driverConfig, err := parseDriverConfig(cfg)
if err != nil {
return nil, nil, err
}
if driverConfig.startBlockForDuration != 0 {
time.Sleep(driverConfig.startBlockForDuration)
}
// Store last configs
d.lastMu.Lock()
d.lastDriverTaskConfig = cfg
d.lastTaskConfig = driverConfig
d.lastMu.Unlock()
if driverConfig.StartErr != "" {
return nil, nil, structs.NewRecoverableError(errors.New(driverConfig.StartErr), driverConfig.StartErrRecoverable)
}
// Create the driver network
net := &drivers.DriverNetwork{
IP: driverConfig.DriverIP,
AutoAdvertise: driverConfig.DriverAdvertise,
}
if raw := driverConfig.DriverPortMap; len(raw) > 0 {
parts := strings.Split(raw, ":")
if len(parts) != 2 {
return nil, nil, fmt.Errorf("malformed port map: %q", raw)
}
port, err := strconv.Atoi(parts[1])
if err != nil {
return nil, nil, fmt.Errorf("malformed port map: %q -- error: %v", raw, err)
}
net.PortMap = map[string]int{parts[0]: port}
}
h := newTaskHandle(cfg, driverConfig, d.logger)
driverState := MockTaskState{
StartedAt: h.startedAt,
}
handle := drivers.NewTaskHandle(taskHandleVersion)
handle.Config = cfg
if err := handle.SetDriverState(&driverState); err != nil {
d.logger.Error("failed to start task, error setting driver state", "error", err, "task_name", cfg.Name)
return nil, nil, fmt.Errorf("failed to set driver state: %v", err)
}
d.tasks.Set(cfg.ID, h)
d.logger.Debug("starting task", "task_name", cfg.Name)
go h.run()
return handle, net, nil
}
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)
select {
case <-ctx.Done():
return
case <-d.ctx.Done():
return
case <-handle.waitCh:
ch <- handle.exitResult
}
}
func (d *Driver) StopTask(taskID string, timeout time.Duration, signal string) error {
h, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
d.logger.Debug("killing task", "task_name", h.taskConfig.Name, "kill_after", h.killAfter)
select {
case <-h.waitCh:
d.logger.Debug("not killing task: already exited", "task_name", h.taskConfig.Name)
case <-time.After(h.killAfter):
d.logger.Debug("killing task due to kill_after", "task_name", h.taskConfig.Name)
h.kill()
}
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")
}
d.tasks.Delete(taskID)
return nil
}
func (d *Driver) InspectTask(taskID string) (*drivers.TaskStatus, error) {
h, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
return h.TaskStatus(), nil
}
func (d *Driver) TaskStats(ctx context.Context, taskID string, interval time.Duration) (<-chan *drivers.TaskResourceUsage, error) {
ch := make(chan *drivers.TaskResourceUsage)
go d.handleStats(ctx, ch)
return ch, nil
}
func (d *Driver) handleStats(ctx context.Context, ch chan<- *drivers.TaskResourceUsage) {
timer := time.NewTimer(0)
for {
select {
case <-timer.C:
// Generate random value for the memory usage
s := &drivers.TaskResourceUsage{
ResourceUsage: &drivers.ResourceUsage{
MemoryStats: &drivers.MemoryStats{
RSS: rand.Uint64(),
Measured: []string{"RSS"},
},
},
Timestamp: time.Now().UTC().UnixNano(),
}
select {
case <-ctx.Done():
return
case ch <- s:
default:
}
case <-ctx.Done():
return
}
}
}
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 {
h, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
if h.command.SignalErr == "" {
return nil
}
return errors.New(h.command.SignalErr)
}
func (d *Driver) ExecTask(taskID string, cmd []string, timeout time.Duration) (*drivers.ExecTaskResult, error) {
h, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
res := drivers.ExecTaskResult{
Stdout: []byte(fmt.Sprintf("Exec(%q, %q)", h.taskConfig.Name, cmd)),
ExitResult: &drivers.ExitResult{},
}
return &res, nil
}
var _ drivers.ExecTaskStreamingDriver = (*Driver)(nil)
func (d *Driver) ExecTaskStreaming(ctx context.Context, taskID string, execOpts *drivers.ExecOptions) (*drivers.ExitResult, error) {
h, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
d.logger.Info("executing task", "command", h.execCommand, "task_id", taskID)
if h.execCommand == nil {
return nil, errors.New("no exec command is configured")
}
cancelCh := make(chan struct{})
exitTimer := make(chan time.Time)
cmd := *h.execCommand
if len(execOpts.Command) == 1 && execOpts.Command[0] == "showinput" {
stdin, _ := ioutil.ReadAll(execOpts.Stdin)
cmd = Command{
RunFor: "1ms",
StdoutString: fmt.Sprintf("TTY: %v\nStdin:\n%s\n",
execOpts.Tty,
stdin,
),
}
}
return runCommand(cmd, execOpts.Stdout, execOpts.Stderr, cancelCh, exitTimer, d.logger), nil
}
// GetTaskConfig is unique to the mock driver and for testing purposes only. It
// returns the *drivers.TaskConfig passed to StartTask and the decoded
// *mock.TaskConfig created by the last StartTask call.
func (d *Driver) GetTaskConfig() (*drivers.TaskConfig, *TaskConfig) {
d.lastMu.Lock()
defer d.lastMu.Unlock()
return d.lastDriverTaskConfig, d.lastTaskConfig
}
// GetHandle is unique to the mock driver and for testing purposes only. It
// returns the handle of the given task ID
func (d *Driver) GetHandle(taskID string) *taskHandle {
h, _ := d.tasks.Get(taskID)
return h
}
func (d *Driver) Shutdown() {
d.signalShutdown()
}
func (d *Driver) CreateNetwork(allocID string) (*drivers.NetworkIsolationSpec, error) {
return nil, nil
}
func (d *Driver) DestroyNetwork(allocID string, spec *drivers.NetworkIsolationSpec) error {
return nil
}