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caasoperator.go
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caasoperator.go
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// Copyright 2017 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package caasoperator
import (
"fmt"
"os"
"path/filepath"
"strings"
"time"
"github.com/juju/clock"
"github.com/juju/errors"
"github.com/juju/loggo"
"github.com/juju/names/v5"
jujusymlink "github.com/juju/utils/v3/symlink"
"github.com/juju/version/v2"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/catacomb"
apiuniter "github.com/juju/juju/api/agent/uniter"
"github.com/juju/juju/caas"
caasconstants "github.com/juju/juju/caas/kubernetes/provider/constants"
"github.com/juju/juju/caas/kubernetes/provider/exec"
"github.com/juju/juju/core/arch"
"github.com/juju/juju/core/leadership"
"github.com/juju/juju/core/life"
"github.com/juju/juju/core/model"
coreos "github.com/juju/juju/core/os"
"github.com/juju/juju/core/paths"
"github.com/juju/juju/core/status"
"github.com/juju/juju/core/watcher"
jujunames "github.com/juju/juju/juju/names"
"github.com/juju/juju/juju/sockets"
jujuversion "github.com/juju/juju/version"
jworker "github.com/juju/juju/worker"
"github.com/juju/juju/worker/caasoperator/remotestate"
"github.com/juju/juju/worker/introspection"
"github.com/juju/juju/worker/uniter"
jujucharm "github.com/juju/juju/worker/uniter/charm"
uniterremotestate "github.com/juju/juju/worker/uniter/remotestate"
"github.com/juju/juju/wrench"
)
// logger is here to stop the desire of creating a package level logger.
// Don't do this, instead pass one through as config to the worker.
type logger interface{}
var _ logger = struct{}{}
var (
jujuExec = paths.JujuExec(paths.CurrentOS())
jujuDumpLogs = paths.JujuDumpLogs(paths.CurrentOS())
jujuIntrospect = paths.JujuIntrospect(paths.CurrentOS())
jujudSymlinks = []string{
jujuExec,
jujuDumpLogs,
jujuIntrospect,
}
)
// caasOperator implements the capabilities of the caasoperator agent. It is not intended to
// implement the actual *behaviour* of the caasoperator agent; that responsibility is
// delegated to Mode values, which are expected to react to events and direct
// the caasoperator's responses to them.
type caasOperator struct {
catacomb catacomb.Catacomb
config Config
paths Paths
runner *worker.Runner
deployer jujucharm.Deployer
stateFile *StateFile
deploymentMode caas.DeploymentMode
}
// Config hold the configuration for a caasoperator worker.
type Config struct {
Logger Logger
// ModelUUID is the UUID of the model.
ModelUUID string
// ModelName is the name of the model.
ModelName string
// Application holds the name of the application that
// this CAAS operator manages.
Application string
// CharmGetter is an interface used for getting the
// application's charm URL and SHA256 hash.
CharmGetter CharmGetter
// Clock holds the clock to be used by the CAAS operator
// for time-related operations.
Clock clock.Clock
// DataDir holds the path to the Juju "data directory",
// i.e. "/var/lib/juju" (by default). The CAAS operator
// expects to find the jujud binary at <data-dir>/tools/jujud.
DataDir string
// ProfileDir is where the introspection scripts are written.
ProfileDir string
// Downloader is an interface used for downloading the
// application charm.
Downloader Downloader
// StatusSetter is an interface used for setting the
// application status.
StatusSetter StatusSetter
// UnitGetter is an interface for getting a unit.
UnitGetter UnitGetter
// UnitRemover is an interface for removing a unit.
UnitRemover UnitRemover
// ApplicationWatcher is an interface for getting info about an application's charm.
ApplicationWatcher ApplicationWatcher
// ContainerStartWatcher provides an interface for watching
// for unit container starts.
ContainerStartWatcher ContainerStartWatcher
// VersionSetter is an interface for setting the operator agent version.
VersionSetter VersionSetter
// LeadershipTrackerFunc is a function for getting a leadership tracker worker.
LeadershipTrackerFunc func(unitTag names.UnitTag) leadership.TrackerWorker
// UniterFacadeFunc is a function for making a uniter facade.
UniterFacadeFunc func(unitTag names.UnitTag) *apiuniter.State
// ResourcesFacadeFunc is a function for making a unit resources facade.
ResourcesFacadeFunc func(unitTag names.UnitTag) (*apiuniter.ResourcesFacadeClient, error)
// PayloadFacadeFunc is a function for making a unit payload facade.
PayloadFacadeFunc func() *apiuniter.PayloadFacadeClient
// UniterParams are parameters used to construct a uniter worker.
UniterParams *uniter.UniterParams
// StartUniterFunc starts a uniter worker using the given runner.
StartUniterFunc func(runner *worker.Runner, params *uniter.UniterParams) error
// RunListenerSocketFunc returns a socket used for the juju run listener.
RunListenerSocketFunc func(*uniter.SocketConfig) (*sockets.Socket, error)
// OperatorInfo contains serving information such as Certs and PrivateKeys.
OperatorInfo caas.OperatorInfo
// ExecClientGetter returns an exec client for initializing caas units.
ExecClientGetter func() (exec.Executor, error)
}
func (config Config) Validate() error {
if !names.IsValidApplication(config.Application) {
return errors.NotValidf("application name %q", config.Application)
}
if config.CharmGetter == nil {
return errors.NotValidf("missing CharmGetter")
}
if config.ApplicationWatcher == nil {
return errors.NotValidf("missing ApplicationWatcher")
}
if config.UnitGetter == nil {
return errors.NotValidf("missing UnitGetter")
}
if config.UnitRemover == nil {
return errors.NotValidf("missing UnitRemover")
}
if config.ContainerStartWatcher == nil {
return errors.NotValidf("missing ContainerStartWatcher")
}
if config.LeadershipTrackerFunc == nil {
return errors.NotValidf("missing LeadershipTrackerFunc")
}
if config.UniterFacadeFunc == nil {
return errors.NotValidf("missing UniterFacadeFunc")
}
if config.ResourcesFacadeFunc == nil {
return errors.NotValidf("missing ResourcesFacadeFunc")
}
if config.PayloadFacadeFunc == nil {
return errors.NotValidf("missing PayloadFacadeFunc")
}
if config.UniterParams == nil {
return errors.NotValidf("missing UniterParams")
}
if config.Clock == nil {
return errors.NotValidf("missing Clock")
}
if config.DataDir == "" {
return errors.NotValidf("missing DataDir")
}
if config.ProfileDir == "" {
return errors.NotValidf("missing ProfileDir")
}
if config.Downloader == nil {
return errors.NotValidf("missing Downloader")
}
if config.StatusSetter == nil {
return errors.NotValidf("missing StatusSetter")
}
if config.VersionSetter == nil {
return errors.NotValidf("missing VersionSetter")
}
if config.ExecClientGetter == nil {
return errors.NotValidf("missing ExecClientGetter")
}
if config.Logger == nil {
return errors.NotValidf("missing Logger")
}
return nil
}
func (config Config) getPaths() Paths {
return NewPaths(config.DataDir, names.NewApplicationTag(config.Application))
}
// NewWorker creates a new worker which will install and operate a
// CaaS-based application, by executing hooks and operations in
// response to application state changes.
func NewWorker(config Config) (worker.Worker, error) {
if err := config.Validate(); err != nil {
return nil, errors.Trace(err)
}
paths := config.getPaths()
logger := config.Logger.Child("charm")
deployer, err := jujucharm.NewDeployer(
paths.State.CharmDir,
paths.State.DeployerDir,
jujucharm.NewBundlesDir(
paths.State.BundlesDir,
config.Downloader,
logger),
logger,
)
if err != nil {
return nil, errors.Annotatef(err, "cannot create deployer")
}
op := &caasOperator{
config: config,
paths: paths,
deployer: deployer,
runner: worker.NewRunner(worker.RunnerParams{
Clock: config.Clock,
// One of the uniter workers failing should not
// prevent the others from running.
IsFatal: func(error) bool { return false },
// For any failures, try again in 3 seconds.
RestartDelay: 3 * time.Second,
Logger: config.Logger.Child("runner"),
}),
}
if err := catacomb.Invoke(catacomb.Plan{
Site: &op.catacomb,
Work: op.loop,
Init: []worker.Worker{op.runner},
}); err != nil {
return nil, errors.Trace(err)
}
return op, nil
}
func (op *caasOperator) makeAgentSymlinks(unitTag names.UnitTag) error {
// All units share the same agent binary.
// Set up the required symlinks.
// First the agent binary.
agentBinaryDir := op.paths.GetToolsDir()
unitToolsDir := filepath.Join(agentBinaryDir, unitTag.String())
err := os.Mkdir(unitToolsDir, 0600)
if err != nil && !os.IsExist(err) {
return errors.Trace(err)
}
jujudPath := filepath.Join(agentBinaryDir, jujunames.Jujud)
err = jujusymlink.New(jujudPath, filepath.Join(unitToolsDir, jujunames.Jujud))
// Ignore permission denied as this won't happen in production
// but may happen in testing depending on setup of /tmp
if err != nil && !os.IsExist(err) && !os.IsPermission(err) {
return errors.Trace(err)
}
// TODO(caas) - remove this when upstream charmhelpers are fixed
// Charmhelpers expect to see a jujud in a machine-X directory.
legacyMachineDir := filepath.Join(agentBinaryDir, "machine-0")
err = os.Mkdir(legacyMachineDir, 0600)
if err != nil && !os.IsExist(err) {
return errors.Trace(err)
}
err = jujusymlink.New(jujudPath, filepath.Join(legacyMachineDir, jujunames.Jujud))
if err != nil && !os.IsExist(err) && !os.IsPermission(err) {
return errors.Trace(err)
}
for _, slk := range jujudSymlinks {
err = jujusymlink.New(jujudPath, slk)
if err != nil && !os.IsExist(err) && !os.IsPermission(err) {
return errors.Trace(err)
}
// TODO(juju 4) - remove this legacy behaviour.
// Remove the obsolete "juju-run" symlink
if strings.Contains(slk, "/juju-exec") {
runLink := strings.Replace(slk, "/juju-exec", "/juju-run", 1)
_ = os.Remove(runLink)
}
}
// Ensure legacy charm symlinks created before 2.8 getting unlinked.
unitCharmDir := filepath.Join(op.config.DataDir, "agents", unitTag.String(), "charm")
isUnitCharmDirSymlink, err := jujusymlink.IsSymlink(unitCharmDir)
if os.IsNotExist(errors.Cause(err)) || os.IsPermission(errors.Cause(err)) {
// Ignore permission denied as this won't happen in production
// but may happen in testing depending on setup of /tmp.
return nil
} else if err != nil {
return errors.Trace(err)
}
if isUnitCharmDirSymlink {
op.config.Logger.Warningf("removing legacy charm symlink for %q", unitTag.String())
if err := os.Remove(unitCharmDir); err != nil {
return errors.Trace(err)
}
}
return nil
}
func (op *caasOperator) removeUnitDir(unitTag names.UnitTag) error {
unitAgentDir := filepath.Join(op.config.DataDir, "agents", unitTag.String())
return os.RemoveAll(unitAgentDir)
}
func toBinaryVersion(vers version.Number, osType string) version.Binary {
outVers := version.Binary{
Number: vers,
Arch: arch.HostArch(),
Release: osType,
}
return outVers
}
func runListenerSocket(sc *uniter.SocketConfig) (*sockets.Socket, error) {
socket := sockets.Socket{
Network: "tcp",
Address: fmt.Sprintf(":%d", caasconstants.JujuExecServerSocketPort),
TLSConfig: sc.TLSConfig,
}
return &socket, nil
}
func (op *caasOperator) init() (*LocalState, error) {
if err := introspection.WriteProfileFunctions(op.config.ProfileDir); err != nil {
// This isn't fatal, just annoying.
op.config.Logger.Errorf("failed to write profile funcs: %v", err)
}
if err := jujucharm.ClearDownloads(op.paths.State.BundlesDir); err != nil {
op.config.Logger.Warningf(err.Error())
}
op.stateFile = NewStateFile(op.paths.State.OperationsFile)
localState, err := op.stateFile.Read()
if err == ErrNoStateFile {
localState = &LocalState{}
}
if err := op.ensureCharm(localState); err != nil {
if err == jworker.ErrTerminateAgent {
return nil, err
}
return nil, errors.Annotatef(err,
"failed to initialize caasoperator for %q",
op.config.Application,
)
}
// Set up a single remote juju run listener to be used by all workload units.
if op.deploymentMode != caas.ModeOperator {
if op.config.RunListenerSocketFunc == nil {
return nil, errors.New("missing RunListenerSocketFunc")
}
if op.config.RunListenerSocketFunc != nil {
socket, err := op.config.RunListenerSocketFunc(op.config.UniterParams.SocketConfig)
if err != nil {
return nil, errors.Annotate(err, "creating juju run socket")
}
op.config.Logger.Debugf("starting caas operator juju-exec listener on %v", socket)
logger := loggo.GetLogger("juju.worker.uniter")
runListener, err := uniter.NewRunListener(*socket, logger)
if err != nil {
return nil, errors.Annotate(err, "creating juju run listener")
}
rlw := uniter.NewRunListenerWrapper(runListener, logger)
if err := op.catacomb.Add(rlw); err != nil {
return nil, errors.Trace(err)
}
op.config.UniterParams.RunListener = runListener
}
}
return localState, nil
}
func (op *caasOperator) loop() (err error) {
logger := op.config.Logger
defer func() {
if err == nil {
logger.Debugf("operator %q is peacefully shutting down", op.config.Application)
} else {
logger.Warningf("operator %q is shutting down, err: %s", op.config.Application, err.Error())
}
if errors.IsNotFound(err) {
err = jworker.ErrTerminateAgent
}
}()
localState, err := op.init()
if err != nil {
return errors.Trace(err)
}
logger.Infof("operator %q started", op.config.Application)
// Start by reporting current tools (which includes arch/ostype).
hostOSType := coreos.HostOSTypeName()
if err := op.config.VersionSetter.SetVersion(
op.config.Application, toBinaryVersion(jujuversion.Current, hostOSType)); err != nil {
return errors.Annotate(err, "cannot set agent version")
}
var remoteWatcher remotestate.Watcher
restartWatcher := func() error {
if remoteWatcher != nil {
// watcher added to catacomb, will kill operator if there's an error.
_ = worker.Stop(remoteWatcher)
}
var err error
remoteWatcher, err = remotestate.NewWatcher(
remotestate.WatcherConfig{
Logger: loggo.GetLogger("juju.worker.caasoperator.remotestate"),
CharmGetter: op.config.CharmGetter,
Application: op.config.Application,
ApplicationWatcher: op.config.ApplicationWatcher,
})
if err != nil {
return errors.Trace(err)
}
if err := op.catacomb.Add(remoteWatcher); err != nil {
return errors.Trace(err)
}
return nil
}
jujuUnitsWatcher, err := op.config.UnitGetter.WatchUnits(op.config.Application)
if err != nil {
return errors.Trace(err)
}
if err := op.catacomb.Add(jujuUnitsWatcher); err != nil {
return errors.Trace(err)
}
var containerStartChan watcher.StringsChannel
if op.deploymentMode != caas.ModeOperator {
// Match the init container and the default container.
containerRegex := fmt.Sprintf("(?:%s|)", caas.InitContainerName)
containerStartWatcher, err := op.config.ContainerStartWatcher.WatchContainerStart(
op.config.Application, containerRegex)
if err != nil {
return errors.Trace(err)
}
if err := op.catacomb.Add(containerStartWatcher); err != nil {
return errors.Trace(err)
}
containerStartChan = containerStartWatcher.Changes()
}
if err := op.setStatus(status.Active, ""); err != nil {
return errors.Trace(err)
}
// Channels used to notify uniter worker that the workload container
// is running.
unitRunningChannels := make(map[string]chan struct{})
if err = restartWatcher(); err != nil {
err = errors.Annotate(err, "(re)starting watcher")
return errors.Trace(err)
}
// We should not do anything until there has been a change
// to the remote state. The watcher will trigger at least
// once initially.
select {
case <-op.catacomb.Dying():
return op.catacomb.ErrDying()
case <-remoteWatcher.RemoteStateChanged():
}
for {
select {
case <-op.catacomb.Dying():
return op.catacomb.ErrDying()
case <-remoteWatcher.RemoteStateChanged():
snap := remoteWatcher.Snapshot()
if op.charmModified(localState, snap) {
// Charm changed so download and install the new version.
err := op.ensureCharm(localState)
if err != nil {
return errors.Annotatef(err, "error downloading updated charm %v", localState.CharmURL)
}
// Reset the application's "Downloading..." message.
if err := op.setStatus(status.Active, ""); err != nil {
return errors.Trace(err)
}
}
case units, ok := <-containerStartChan:
if !ok {
return errors.New("container start watcher closed channel")
}
for _, unitID := range units {
if runningChan, ok := unitRunningChannels[unitID]; ok {
logger.Debugf("trigger running status for caas unit %v", unitID)
select {
case <-op.catacomb.Dying():
return op.catacomb.ErrDying()
case runningChan <- struct{}{}:
default:
// This will happen when the buffered channel already
// has an event. If this is the case it's ok to discard
// the event.
logger.Debugf("unit running chan[%q] discarding running event as one already exists", unitID)
}
}
}
case units, ok := <-jujuUnitsWatcher.Changes():
if !ok {
return errors.New("watcher closed channel")
}
for _, v := range units {
unitID := v
unitLife, err := op.config.UnitGetter.Life(unitID)
if err != nil && !errors.IsNotFound(err) {
return errors.Trace(err)
}
logger.Debugf("got unit change %q (%s)", unitID, unitLife)
unitTag := names.NewUnitTag(unitID)
if errors.IsNotFound(err) || unitLife == life.Dead {
delete(unitRunningChannels, unitID)
logger.Debugf("stopping uniter for dead unit %q", unitID)
if err := op.runner.StopAndRemoveWorker(unitID, op.catacomb.Dying()); err != nil {
logger.Warningf("stopping uniter for dead unit %q: %v", unitID, err)
}
logger.Debugf("removing dead unit %q", unitID)
// Remove the unit from state.
if err := op.config.UnitRemover.RemoveUnit(unitID); err != nil {
return errors.Trace(err)
}
logger.Debugf("removing unit dir for dead unit %q", unitID)
// Remove the unit's directory
if err := op.removeUnitDir(unitTag); err != nil {
return errors.Trace(err)
}
// Nothing to do for a dead unit further.
continue
} else {
if _, ok := unitRunningChannels[unitID]; !ok && op.deploymentMode != caas.ModeOperator {
// We make a buffered channel here so that we don't
// block the operator while the uniter may not be ready
unitRunningChannels[unitID] = make(chan struct{}, 1)
}
}
// Start a worker to manage any new units.
if _, err := op.runner.Worker(unitID, op.catacomb.Dying()); err == nil || unitLife == life.Dead {
// Already watching the unit or we're
// not yet watching it and it's dead.
continue
}
// Make all the required symlinks.
if err := op.makeAgentSymlinks(unitTag); err != nil {
return errors.Trace(err)
}
params := *op.config.UniterParams
params.ModelType = model.CAAS
params.UnitTag = unitTag
params.Downloader = op.config.Downloader // TODO(caas): write a cache downloader
params.UniterFacade = op.config.UniterFacadeFunc(unitTag)
if params.ResourcesFacade, err = op.config.ResourcesFacadeFunc(unitTag); err != nil {
return errors.Trace(err)
}
params.PayloadFacade = op.config.PayloadFacadeFunc()
params.LeadershipTrackerFunc = op.config.LeadershipTrackerFunc
params.Logger = params.Logger.Child(unitID)
if op.deploymentMode != caas.ModeOperator {
params.IsRemoteUnit = true
params.ContainerRunningStatusChannel = unitRunningChannels[unitID]
execClient, err := op.config.ExecClientGetter()
if err != nil {
return errors.Trace(err)
}
params.ContainerRunningStatusFunc = func(providerID string) (*uniterremotestate.ContainerRunningStatus, error) {
if wrench.IsActive("remote-init", "fatal-error") {
return nil, errors.New("fake remote-init fatal-error")
}
return op.runningStatus(execClient, unitTag, providerID)
}
params.RemoteInitFunc = func(runningStatus uniterremotestate.ContainerRunningStatus, cancel <-chan struct{}) error {
// TODO(caas): Remove the cached status uniterremotestate.ContainerRunningStatus from uniter watcher snapshot.
return op.remoteInitForUniter(execClient, unitTag, runningStatus, cancel)
}
params.NewRemoteRunnerExecutor = getNewRunnerExecutor(logger, execClient)
}
if err := op.config.StartUniterFunc(op.runner, ¶ms); err != nil {
return errors.Trace(err)
}
}
}
}
}
func (op *caasOperator) runningStatus(client exec.Executor, unit names.UnitTag, providerID string) (*uniterremotestate.ContainerRunningStatus, error) {
op.config.Logger.Debugf("request running status for %q %s", unit.String(), providerID)
params := exec.StatusParams{
PodName: providerID,
}
status, err := client.Status(params)
if err != nil {
op.config.Logger.Errorf("could not get pod %q %q %v", unit.String(), providerID, err)
return nil, errors.Annotatef(err, "getting pod status for unit %q, container %q", unit, providerID)
}
result := &uniterremotestate.ContainerRunningStatus{
PodName: status.PodName,
}
once := true
for _, cs := range status.ContainerStatus {
if cs.InitContainer && cs.Name == caas.InitContainerName {
result.Initialising = cs.Running
result.InitialisingTime = cs.StartedAt
}
// Only check the default container.
if !cs.InitContainer && !cs.EphemeralContainer && once {
result.Running = cs.Running
once = false
}
}
return result, nil
}
func (op *caasOperator) remoteInitForUniter(client exec.Executor, unit names.UnitTag, runningStatus uniterremotestate.ContainerRunningStatus, cancel <-chan struct{}) error {
return runnerWithRetry(
func() error {
status, err := op.runningStatus(client, unit, runningStatus.PodName)
// get the current status rather than using the status cached in remote state.
if err != nil {
return errors.Trace(err)
}
return op.remoteInit(client, unit, *status, cancel)
},
func(err error) bool {
// We need to re-fetch the running status then retry remoteInit if the container is not running.
return err != nil && !exec.IsContainerNotRunningError(err) && !errors.IsNotFound(err)
}, op.config.Logger, op.config.Clock, cancel,
)
}
func (op *caasOperator) remoteInit(client exec.Executor, unit names.UnitTag, runningStatus uniterremotestate.ContainerRunningStatus, cancel <-chan struct{}) error {
op.config.Logger.Debugf("remote init for %q %+v", unit.String(), runningStatus)
switch {
case runningStatus.Initialising:
// all good, continue to do remote-init.
return errors.Trace(initializeUnit(initializeUnitParams{
ExecClient: client,
Logger: op.config.Logger,
OperatorInfo: op.config.OperatorInfo,
Paths: op.paths,
UnitTag: unit,
ProviderID: runningStatus.PodName,
WriteFile: os.WriteFile,
TempDir: os.MkdirTemp,
Clock: op.config.Clock,
ReTrier: runnerWithRetry,
}, cancel))
case runningStatus.Running:
op.config.Logger.Debugf("no need to do remote-init for a running container")
return nil
default:
return errors.NotFoundf("container not running")
}
}
func (op *caasOperator) charmModified(local *LocalState, remote remotestate.Snapshot) bool {
// CAAS models may not yet have read the charm url from state.
if remote.CharmURL == nil {
return false
}
if local == nil || local.CharmURL == nil {
op.config.Logger.Warningf("unexpected nil local charm URL")
return true
}
if *local.CharmURL != *remote.CharmURL {
op.config.Logger.Debugf("upgrade from %v to %v", local.CharmURL, remote.CharmURL)
return true
}
if local.CharmModifiedVersion != remote.CharmModifiedVersion {
op.config.Logger.Debugf("upgrade from CharmModifiedVersion %v to %v", local.CharmModifiedVersion, remote.CharmModifiedVersion)
return true
}
if remote.ForceCharmUpgrade {
op.config.Logger.Debugf("force charm upgrade to %v", remote.CharmURL)
return true
}
return false
}
func (op *caasOperator) setStatus(status status.Status, message string, args ...interface{}) error {
err := op.config.StatusSetter.SetStatus(
op.config.Application,
status,
fmt.Sprintf(message, args...),
nil,
)
return errors.Annotate(err, "setting status")
}
// Kill is part of the worker.Worker interface.
func (op *caasOperator) Kill() {
op.catacomb.Kill(nil)
}
// Wait is part of the worker.Worker interface.
func (op *caasOperator) Wait() error {
return op.catacomb.Wait()
}