/
driver.go
741 lines (619 loc) · 22.5 KB
/
driver.go
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package pot
import (
"context"
"errors"
"fmt"
"os"
"os/exec"
"strings"
"syscall"
"time"
"github.com/hashicorp/consul-template/signals"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/nomad/drivers/shared/eventer"
"github.com/hashicorp/nomad/helper/pluginutils/hclutils"
"github.com/hashicorp/nomad/plugins/base"
"github.com/hashicorp/nomad/plugins/drivers"
"github.com/hashicorp/nomad/plugins/shared/hclspec"
"github.com/hashicorp/nomad/plugins/shared/structs"
)
const (
// pluginName is the name of the plugin
pluginName = "pot"
// pluginVersion allows the client to identify and use newer versions of
// an installed plugin
pluginVersion = "v0.10.0"
// fingerprintPeriod is the interval at which the driver will send fingerprint responses
fingerprintPeriod = 30 * time.Second
// taskHandleVersion is the version of task handle which this driver sets
// and understands how to decode driver state
taskHandleVersion = 2
// potBIN is the singularity binary path.
potBIN = "/usr/local/bin/pot"
)
var (
// pluginInfo is the response returned for the PluginInfo RPC
pluginInfo = &base.PluginInfoResponse{
Type: base.PluginTypeDriver,
PluginApiVersions: []string{drivers.ApiVersion010},
PluginVersion: pluginVersion,
Name: pluginName,
}
// configSpec is the hcl specification returned by the ConfigSchema RPC
configSpec = hclspec.NewObject(map[string]*hclspec.Spec{
"enabled": hclspec.NewDefault(
hclspec.NewAttr("enabled", "bool", false),
hclspec.NewLiteral("true"),
),
})
// 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{
"image": hclspec.NewAttr("image", "string", true),
"pot": hclspec.NewAttr("pot", "string", true),
"tag": hclspec.NewAttr("tag", "string", true),
"command": hclspec.NewAttr("command", "string", false),
"args": hclspec.NewAttr("args", "list(string)", false),
"port_map": hclspec.NewAttr("port_map", "list(map(string))", false),
"network_mode": hclspec.NewAttr("network_mode", "string", false),
"mount": hclspec.NewAttr("mount", "list(string)", false),
"copy": hclspec.NewAttr("copy", "list(string)", false),
"mount_read_only": hclspec.NewAttr("mount_read_only", "list(string)", false),
"extra_hosts": hclspec.NewAttr("extra_hosts", "list(string)", false),
"attributes": hclspec.NewAttr("attributes", "list(string)", false),
})
// capabilities is returned by the Capabilities RPC and indicates what
// optional features this driver supports
capabilities = &drivers.Capabilities{
SendSignals: true,
Exec: true,
}
)
// Driver is a driver for running Pot containers
// https://github.com/pizzamig/pot
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
// config is the driver configuration set by the SetConfig RPC
config *Config
// nomadConfig is the client config from nomad
nomadConfig *base.ClientDriverConfig
// tasks is the in memory datastore mapping taskIDs to rawExecDriverHandles
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
// logger will log to the Nomad agent
logger hclog.Logger
}
// Config is the driver configuration set by the SetConfig RPC call
type Config struct {
// Enabled is set to true to enable the Pot driver
Enabled bool `codec:"enabled"`
}
// TaskConfig is the driver configuration of a task within a job
type TaskConfig struct {
Image string `codec:"image"`
Pot string `codec:"pot"`
Tag string `codec:"tag"`
Alloc string `codec:"alloc"`
// Command can be run or exec , shell is not supported via plugin
Command string `codec:"command"`
Args []string `codec:"args"`
//Port []string `codec:"port"`
PortMap hclutils.MapStrStr `codec:"port_map"`
Name string `codec:"name"`
//Network Mode
NetworkMode string `codec:"network_mode"`
// Enable debug-verbose global options
Debug bool `codec:"debug"`
Verbose bool `codec:"verbose"`
Mount []string `codec:"mount"` // Host-Volumes to mount in, syntax: /path/to/host/directory:/destination/path/in/container
MountReadOnly []string `codec:"mount_read_only"` // Host-Volumes to mount in, syntax: /path/to/host/directory:/destination/path/in/container
Copy []string `codec:"copy"` // Files in host to copy in, syntax: /path/to/host/file.ext:/destination/path/in/container/file.ext
ExtraHosts []string `codec:"extra_hosts"` // ExtraHosts a list of hosts, given as host:IP, to be added to /etc/hosts
Attributes []string `codec:"attributes"` // Pot attributes, syntax: Attribute:Value
}
// TaskState is the state which is encoded in the handle returned in
// StartTask. This information is needed to rebuild the task state and handler
// during recovery.
type TaskState struct {
ReattachConfig *structs.ReattachConfig
TaskConfig *drivers.TaskConfig
StartedAt time.Time
ContainerName string
PID int
}
// NewPotDriver returns a new DriverPlugin implementation
func NewPotDriver(logger hclog.Logger) drivers.DriverPlugin {
ctx, cancel := context.WithCancel(context.Background())
logger = logger.Named(pluginName)
return &Driver{
eventer: eventer.NewEventer(ctx, logger),
config: &Config{},
tasks: newTaskStore(),
ctx: ctx,
signalShutdown: cancel,
logger: logger,
}
}
// PluginInfo return a base.PluginInfoResponse struct
func (d *Driver) PluginInfo() (*base.PluginInfoResponse, error) {
return pluginInfo, nil
}
// ConfigSchema return a hclspec.Spec struct
func (d *Driver) ConfigSchema() (*hclspec.Spec, error) {
return configSpec, nil
}
// SetConfig set the nomad agent config based on base.Config
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 cfg.AgentConfig != nil {
d.nomadConfig = cfg.AgentConfig.Driver
}
return nil
}
// Shutdown the plugin
func (d *Driver) Shutdown(ctx context.Context) error {
d.signalShutdown()
return nil
}
// TaskConfigSchema returns a hclspec.Spec struct
func (d *Driver) TaskConfigSchema() (*hclspec.Spec, error) {
return taskConfigSpec, nil
}
// Capabilities a drivers.Capabilities struct
func (d *Driver) Capabilities() (*drivers.Capabilities, error) {
return capabilities, nil
}
// Fingerprint return the plugin fingerprint
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) {
defer close(ch)
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]*structs.Attribute{},
Health: drivers.HealthStateHealthy,
HealthDescription: drivers.DriverHealthy,
}
if d.config.Enabled && pluginVersion != "" {
fp.Health = drivers.HealthStateHealthy
fp.HealthDescription = "healthy"
fp.Attributes["driver.pot"] = structs.NewBoolAttribute(true)
fp.Attributes["driver.pot.version"] = structs.NewStringAttribute(pluginVersion)
} else {
fp.Health = drivers.HealthStateUndetected
fp.HealthDescription = "disabled"
}
return fp
}
// RecoverTask try to recover a failed task, if not return error
func (d *Driver) RecoverTask(handle *drivers.TaskHandle) error {
d.logger.Trace("###########################################################################################################################################")
d.logger.Trace("########################################################RECOVER-TASK#######################################################################")
d.logger.Trace("###########################################################################################################################################")
d.logger.Trace("RECOVER TASK", "ID", handle.Config.ID)
if handle == nil {
return errors.New("error: handle cannot be nil")
}
if taskhandle, ok := d.tasks.Get(handle.Config.ID); ok {
d.logger.Debug("Getting task failed", "tasks ", taskhandle)
return nil
}
var taskState TaskState
if err := handle.GetDriverState(&taskState); err != nil {
return fmt.Errorf("failed to decode task state from handle: %v", err)
}
if err := handle.SetDriverState(&taskState); err != nil {
d.logger.Trace("failed to recover task, error setting driver state", "error", err)
}
d.logger.Trace("RECOVER TASK", "taskState", taskState)
var driverConfig TaskConfig
d.logger.Trace("TASKCONFIG RECOVER", "TASKCONFIG RECOVER", taskState.TaskConfig)
if err := taskState.TaskConfig.DecodeDriverConfig(&driverConfig); err != nil {
d.logger.Trace("failed to recover driverConfig, error setting driver state", "error", err)
}
se, err := prepareContainer(handle.Config, driverConfig)
if err != nil {
return err
}
se.logger = d.logger
alive := se.checkContainerAlive(handle.Config)
if alive == 0 {
d.tasks.Delete(handle.Config.ID)
return fmt.Errorf("unable to recover a container that is not running")
} else {
se.containerPid = alive
parts := strings.Split(handle.Config.ID, "/")
completeName := parts[1] + "_" + parts[2] + "_" + parts[0]
Sout, err := se.Stdout()
if err != nil {
d.logger.Error("Error setting stdout with", "err", err)
}
Serr, err := se.Stderr()
if err != nil {
d.logger.Error("Error setting stderr with", "err", err)
}
directory := handle.Config.TaskDir().SharedTaskDir
se.cmd = &exec.Cmd{
Args: []string{"/usr/local/bin/pot", "start", completeName},
Dir: directory,
Path: potBIN,
Process: &os.Process{
Pid: alive,
},
Stdout: Sout,
Stderr: Serr,
}
}
h := &taskHandle{
syexec: se,
pid: se.containerPid,
taskConfig: taskState.TaskConfig,
procState: drivers.TaskStateRunning,
startedAt: time.Now().Round(time.Millisecond),
logger: d.logger,
exitResult: &drivers.ExitResult{
ExitCode: 0,
Err: nil,
OOMKilled: false,
Signal: 0,
},
}
driverState := TaskState{
ContainerName: driverConfig.Image,
PID: se.containerPid,
TaskConfig: handle.Config,
StartedAt: h.startedAt,
}
d.logger.Trace("RECOVER TASK", "taskState before", driverState)
if err := handle.SetDriverState(&driverState); err != nil {
d.logger.Error("failed to start task, error setting driver state", "error", err)
//Destroy container if err on setting driver state
se.destroyContainer(handle.Config, &h.calledDestroy)
return fmt.Errorf("failed to set driver state: %v", err)
}
d.logger.Trace("RECOVER TASK", "taskState after", driverState)
d.tasks.Set(taskState.TaskConfig.ID, h)
d.logger.Trace("RECOVER TASK", "h", h)
if alive == 0 {
go h.run()
} else {
h.procState = drivers.TaskStateRunning
h.exitResult.ExitCode = h.syexec.exitCode
h.exitResult.Signal = 0
h.completedAt = time.Now()
}
go d.recoverWait(handle.Config.ID, se)
d.logger.Trace("###########################################################################################################################################")
d.logger.Trace("########################################################/RECOVER-TASK######################################################################")
d.logger.Trace("###########################################################################################################################################")
return nil
}
// StartTask setup the task exec and calls the container excecutor
func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drivers.DriverNetwork, error) {
d.logger.Trace("###########################################################################################################################################")
d.logger.Trace("########################################################STARTTASK##########################################################################")
d.logger.Trace("###########################################################################################################################################")
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 in STARTTASK: %v", err)
}
d.logger.Trace("StartTask", "driverConfig", driverConfig)
d.logger.Info("starting task", "driver_cfg", hclog.Fmt("%+v", driverConfig))
handle := drivers.NewTaskHandle(taskHandleVersion)
handle.Config = cfg
se, err := prepareContainer(cfg, driverConfig)
if err != nil {
return nil, nil, err
}
se.logger = d.logger
//se.logger.Info("Checking container alive from StartTask")
alive := se.checkContainerAlive(cfg)
if alive == 0 {
d.logger.Trace("StartTask", "Container not alive", alive)
exists := se.checkContainerExists(cfg)
if exists == 0 {
if err := se.createContainer(cfg); err != nil {
//Destroy container if err on creation
err := se.destroyContainer(cfg, nil)
if err != nil {
d.logger.Error("Error destroying container with err: ", err)
}
return nil, nil, fmt.Errorf("unable to create container: %v", err)
}
d.logger.Trace("StartTask", "Created container, se:", se)
if err := se.startContainer(cfg); err != nil {
err := se.destroyContainer(cfg, nil)
if err != nil {
d.logger.Error("Error destroying container with err: ", err)
}
return nil, nil, fmt.Errorf("unable to start container: %v", err)
}
d.logger.Trace("StartTask", "Started task, se", se)
} else {
d.logger.Trace("StartTask", "Container existed, se", se)
if err := se.startContainer(cfg); err != nil {
err := se.destroyContainer(cfg, nil)
if err != nil {
d.logger.Error("Error destroying container with err: ", err)
}
return nil, nil, fmt.Errorf("unable to start container: %v", err)
}
}
} else {
se.containerPid = alive
parts := strings.Split(cfg.ID, "/")
completeName := parts[1] + "_" + parts[2] + "_" + parts[0]
se.cmd = &exec.Cmd{
Args: []string{"/usr/local/bin/pot", "start", completeName},
Dir: cfg.AllocDir,
Path: potBIN,
Process: &os.Process{
Pid: alive,
},
}
d.logger.Trace("StartTask", "RECOVER TASK cmd", se.cmd)
}
h := &taskHandle{
syexec: se,
pid: se.containerPid,
taskConfig: cfg,
procState: drivers.TaskStateRunning,
startedAt: time.Now().Round(time.Millisecond),
logger: d.logger,
}
driverState := TaskState{
ContainerName: driverConfig.Image,
PID: se.containerPid,
TaskConfig: cfg,
StartedAt: h.startedAt,
}
d.logger.Trace("START TASK", "taskState", driverState)
if err := handle.SetDriverState(&driverState); err != nil {
d.logger.Error("failed to start task, error setting driver state", "error", err)
//Destroy container if err on setting driver state
se.destroyContainer(cfg, &h.calledDestroy)
return nil, nil, fmt.Errorf("failed to set driver state: %v", err)
}
d.logger.Trace("START TASK", "taskState", driverState)
d.tasks.Set(cfg.ID, h)
if alive == 0 {
go h.run()
}
go d.potWait(cfg.ID, se)
d.logger.Trace("###########################################################################################################################################")
d.logger.Trace("########################################################/STARTTASK#########################################################################")
d.logger.Trace("###########################################################################################################################################")
return handle, nil, nil
}
func (d *Driver) recoverWait(id string, se syexec) {
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
OuterLoop:
for {
select {
case <-d.ctx.Done():
break OuterLoop
case <-ticker.C:
//d.logger.Info("Checking containerAlive from Ticker recoverWait")
code := se.checkContainerAlive(se.cfg)
if code == 0 {
d.logger.Error("Container", "RecoverWait Break", se.cfg.JobName)
break OuterLoop
}
}
}
handle, _ := d.tasks.Get(id)
handle.procState = drivers.TaskStateExited
last_run, err := se.getContainerLastRunStats(handle.taskConfig)
if err != nil {
d.logger.Error("Error getting container last-run-stats with err: ", err)
handle.exitResult.ExitCode = defaultFailedCode
} else {
handle.exitResult.ExitCode = last_run.ExitCode
}
err = se.destroyContainer(handle.taskConfig, &handle.calledDestroy)
if err != nil {
d.logger.Error("Error destroying container with err: ", err)
}
}
func (d *Driver) potWait(taskID string, se syexec) {
handle, _ := d.tasks.Get(taskID)
err := se.cmd.Wait()
handle.procState = drivers.TaskStateExited
if err != nil {
d.logger.Error("Error exiting se.cmd.Wait in potWait", "Err", err)
handle.exitResult.ExitCode = defaultFailedCode
if exitError, ok := err.(*exec.ExitError); ok {
ws := exitError.Sys().(syscall.WaitStatus)
if ws.ExitStatus() == 125 { // enclosed process exited with error
last_run_stats, err := se.getContainerLastRunStats(handle.taskConfig)
if err != nil {
d.logger.Error("Error getting container last-run-stats with err: ", err)
} else {
handle.exitResult.ExitCode = last_run_stats.ExitCode
}
}
}
}
err = se.destroyContainer(handle.taskConfig, &handle.calledDestroy)
if err != nil {
d.logger.Error("Error destroying container with err: ", err)
}
}
// WaitTask waits for task completion
func (d *Driver) WaitTask(ctx context.Context, taskID string) (<-chan *drivers.ExitResult, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
d.logger.Error("WaitTask", "handle", "!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)
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-d.ctx.Done():
return
case <-ticker.C:
s := handle.TaskStatus()
//d.logger.Error("handleWait", "handle", s)
if s.State == drivers.TaskStateExited {
ch <- handle.exitResult
}
}
}
}
// StopTask shutdown a tasked based on its taskID
func (d *Driver) StopTask(taskID string, timeout time.Duration, signal string) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
var driverConfig TaskConfig
if err := handle.taskConfig.DecodeDriverConfig(&driverConfig); err != nil {
//return fmt.Errorf("failed to decode driver config in STOPTASK: %v", err)
d.logger.Error("unable to decode driver in STOPTASK:", err)
}
se := prepareDestroy(handle.taskConfig, driverConfig)
se.logger = d.logger
if err := se.destroyContainer(handle.taskConfig, &handle.calledDestroy); err != nil {
return fmt.Errorf("unable to run destroyContainer: %v", err)
}
return nil
}
// DestroyTask delete task
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 errors.New("cannot destroy running task")
}
d.tasks.Delete(taskID)
return nil
}
// InspectTask retrieves task info
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
}
// TaskStats get task stats
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.stats(ctx, interval)
}
// TaskEvents return a chan *drivers.TaskEvent
func (d *Driver) TaskEvents(ctx context.Context) (<-chan *drivers.TaskEvent, error) {
return d.eventer.TaskEvents(ctx)
}
// SignalTask send a specific signal to a taskID
func (d *Driver) SignalTask(taskID string, signal string) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
sig, err := signals.Parse(signal)
if err != nil {
return fmt.Errorf("failed to parse signal: %v", err)
}
var driverConfig TaskConfig
if err := handle.taskConfig.DecodeDriverConfig(&driverConfig); err != nil {
return fmt.Errorf("failed to decode driver config in SignalTask: %v", err)
}
se, err := prepareSignal(handle.taskConfig, driverConfig, sig)
if err != nil {
return fmt.Errorf("unable to run PrepareSignal: %v", err)
}
se.logger = d.logger
if err := se.signalContainer(handle.taskConfig); err != nil {
return fmt.Errorf("unable to run SignalContainer: %v", err)
}
if se.state.ExitCode != 0 {
return fmt.Errorf("SignalContainer returned error code %v", se.state.ExitCode)
}
return nil
}
// ExecTask calls a exec cmd over a running task
func (d *Driver) ExecTask(taskID string, cmd []string, timeout time.Duration) (*drivers.ExecTaskResult, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
if len(cmd) == 0 {
return nil, fmt.Errorf("cmd is required, but was empty")
}
se, err := prepareExec(handle.taskConfig, cmd)
if err != nil {
return nil, fmt.Errorf("unable to run PrepareCommand: %v", err)
}
se.logger = d.logger
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
return se.execInContainer(ctx, handle.taskConfig)
}
var _ drivers.ExecTaskStreamingRawDriver = (*Driver)(nil)
func (d *Driver) ExecTaskStreamingRaw(ctx context.Context,
taskID string,
command []string,
tty bool,
stream drivers.ExecTaskStream) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
if len(command) == 0 {
return fmt.Errorf("command is required")
}
se, err := prepareExec(handle.taskConfig, command)
if err != nil {
return fmt.Errorf("unable to run PrepareCommand: %v", err)
}
se.logger = d.logger
return se.execStreaming(ctx, handle.taskConfig, tty, stream)
}