func (a *UnitAgent) APIWorkers() (_ worker.Worker, err error) {
agentConfig := a.CurrentConfig()
dataDir := agentConfig.DataDir()
hookLock, err := cmdutil.HookExecutionLock(dataDir)
if err != nil {
return nil, err
}
st, entity, err := OpenAPIState(agentConfig, a)
if err != nil {
return nil, err
}
unitTag, err := names.ParseUnitTag(entity.Tag())
if err != nil {
return nil, errors.Trace(err)
}
// Ensure that the environment uuid is stored in the agent config.
// Luckily the API has it recorded for us after we connect.
if agentConfig.Environment().Id() == "" {
err := a.ChangeConfig(func(setter agent.ConfigSetter) error {
environTag, err := st.EnvironTag()
if err != nil {
return errors.Annotate(err, "no environment uuid set on api")
}
return setter.Migrate(agent.MigrateParams{
Environment: environTag,
})
})
if err != nil {
logger.Warningf("unable to save environment uuid: %v", err)
// Not really fatal, just annoying.
}
}
defer func() {
if err != nil {
st.Close()
reportClosedUnitAPI(st)
}
}()
// Before starting any workers, ensure we record the Juju version this unit
// agent is running.
currentTools := &tools.Tools{Version: version.Current}
apiStateUpgrader := a.getUpgrader(st)
if err := apiStateUpgrader.SetVersion(agentConfig.Tag().String(), currentTools.Version); err != nil {
return nil, errors.Annotate(err, "cannot set unit agent version")
}
runner := worker.NewRunner(cmdutil.ConnectionIsFatal(logger, st), cmdutil.MoreImportant)
// start proxyupdater first to ensure proxy settings are correct
runner.StartWorker("proxyupdater", func() (worker.Worker, error) {
return proxyupdater.New(st.Environment(), false), nil
})
runner.StartWorker("upgrader", func() (worker.Worker, error) {
return upgrader.NewAgentUpgrader(
st.Upgrader(),
agentConfig,
agentConfig.UpgradedToVersion(),
func() bool { return false },
a.initialAgentUpgradeCheckComplete,
), nil
})
runner.StartWorker("logger", func() (worker.Worker, error) {
return workerlogger.NewLogger(st.Logger(), agentConfig), nil
})
runner.StartWorker("uniter", func() (worker.Worker, error) {
uniterFacade, err := st.Uniter()
if err != nil {
return nil, errors.Trace(err)
}
uniterParams := uniter.UniterParams{
uniterFacade,
unitTag,
leadership.NewClient(st),
dataDir,
hookLock,
uniter.NewMetricsTimerChooser(),
uniter.NewUpdateStatusTimer(),
}
return uniter.NewUniter(&uniterParams), nil
})
runner.StartWorker("apiaddressupdater", func() (worker.Worker, error) {
uniterFacade, err := st.Uniter()
if err != nil {
return nil, errors.Trace(err)
}
return apiaddressupdater.NewAPIAddressUpdater(uniterFacade, a), nil
})
runner.StartWorker("rsyslog", func() (worker.Worker, error) {
return cmdutil.NewRsyslogConfigWorker(st.Rsyslog(), agentConfig, rsyslog.RsyslogModeForwarding)
})
return cmdutil.NewCloseWorker(logger, runner, st), nil
}
func newConnRunner(conns ...cmdutil.Pinger) worker.Runner {
return worker.NewRunner(cmdutil.ConnectionIsFatal(logger, conns...), cmdutil.MoreImportant, worker.RestartDelay)
}
// startAPIWorkers is called to start workers which rely on the
// machine agent's API connection (via the apiworkers manifold). It
// returns a Runner with a number of workers attached to it.
//
// The workers started here need to be converted to run under the
// dependency engine. Once they have all been converted, this method -
// and the apiworkers manifold - can be removed.
func (a *MachineAgent) startAPIWorkers(apiConn api.Connection) (_ worker.Worker, outErr error) {
agentConfig := a.CurrentConfig()
entity, err := apiagent.NewState(apiConn).Entity(a.Tag())
if err != nil {
return nil, errors.Trace(err)
}
var isModelManager bool
for _, job := range entity.Jobs() {
switch job {
case multiwatcher.JobManageModel:
isModelManager = true
default:
// TODO(dimitern): Once all workers moved over to using
// the API, report "unknown job type" here.
}
}
runner := worker.NewRunner(
cmdutil.ConnectionIsFatal(logger, apiConn),
cmdutil.MoreImportant,
worker.RestartDelay,
)
defer func() {
// If startAPIWorkers exits early with an error, stop the
// runner so that any already started runners aren't leaked.
if outErr != nil {
worker.Stop(runner)
}
}()
// Perform the operations needed to set up hosting for containers.
if err := a.setupContainerSupport(runner, apiConn, agentConfig); err != nil {
cause := errors.Cause(err)
if params.IsCodeDead(cause) || cause == worker.ErrTerminateAgent {
return nil, worker.ErrTerminateAgent
}
return nil, errors.Errorf("setting up container support: %v", err)
}
if isModelManager {
// Published image metadata for some providers are in simple streams.
// Providers that do not depend on simple streams do not need this worker.
env, err := environs.GetEnviron(apiagent.NewState(apiConn), newEnvirons)
if err != nil {
return nil, errors.Annotate(err, "getting environ")
}
if _, ok := env.(simplestreams.HasRegion); ok {
// Start worker that stores published image metadata in state.
runner.StartWorker("imagemetadata", func() (worker.Worker, error) {
return newMetadataUpdater(apiConn.MetadataUpdater()), nil
})
}
// We don't have instance info set and the network config for the
// bootstrap machine only, so update it now. All the other machines will
// have instance info including network config set at provisioning time.
if err := a.setControllerNetworkConfig(apiConn); err != nil {
return nil, errors.Annotate(err, "setting controller network config")
}
} else {
runner.StartWorker("stateconverter", func() (worker.Worker, error) {
// TODO(fwereade): this worker needs its own facade.
facade := apimachiner.NewState(apiConn)
handler := conv2state.New(facade, a)
w, err := watcher.NewNotifyWorker(watcher.NotifyConfig{
Handler: handler,
})
if err != nil {
return nil, errors.Annotate(err, "cannot start controller promoter worker")
}
return w, nil
})
}
return runner, nil
}