func (a *UnitAgent) APIWorkers() (worker.Worker, error) {
agentConfig := a.CurrentConfig()
dataDir := agentConfig.DataDir()
hookLock, err := hookExecutionLock(dataDir)
if err != nil {
return nil, err
}
st, entity, err := openAPIState(agentConfig, a)
if err != nil {
return nil, err
}
runner := worker.NewRunner(connectionIsFatal(st), moreImportant)
runner.StartWorker("upgrader", func() (worker.Worker, error) {
return upgrader.NewUpgrader(st.Upgrader(), agentConfig), nil
})
runner.StartWorker("logger", func() (worker.Worker, error) {
return workerlogger.NewLogger(st.Logger(), agentConfig), nil
})
runner.StartWorker("uniter", func() (worker.Worker, error) {
return uniter.NewUniter(st.Uniter(), entity.Tag(), dataDir, hookLock), nil
})
runner.StartWorker("apiaddressupdater", func() (worker.Worker, error) {
return apiaddressupdater.NewAPIAddressUpdater(st.Uniter(), a), nil
})
runner.StartWorker("rsyslog", func() (worker.Worker, error) {
return newRsyslogConfigWorker(st.Rsyslog(), agentConfig, rsyslog.RsyslogModeForwarding)
})
return newCloseWorker(runner, st), nil
}
// APIWorker returns a Worker that connects to the API and starts any
// workers that need an API connection.
func (a *MachineAgent) APIWorker() (worker.Worker, error) {
agentConfig := a.CurrentConfig()
st, entity, err := openAPIState(agentConfig, a)
if err != nil {
return nil, err
}
reportOpenedAPI(st)
// Refresh the configuration, since it may have been updated after opening state.
agentConfig = a.CurrentConfig()
for _, job := range entity.Jobs() {
if job.NeedsState() {
info, err := st.Agent().StateServingInfo()
if err != nil {
return nil, fmt.Errorf("cannot get state serving info: %v", err)
}
err = a.ChangeConfig(func(config agent.ConfigSetter) {
config.SetStateServingInfo(info)
})
if err != nil {
return nil, err
}
agentConfig = a.CurrentConfig()
break
}
}
rsyslogMode := rsyslog.RsyslogModeForwarding
runner := newRunner(connectionIsFatal(st), moreImportant)
var singularRunner worker.Runner
for _, job := range entity.Jobs() {
if job == params.JobManageEnviron {
rsyslogMode = rsyslog.RsyslogModeAccumulate
conn := singularAPIConn{st, st.Agent()}
singularRunner, err = newSingularRunner(runner, conn)
if err != nil {
return nil, fmt.Errorf("cannot make singular API Runner: %v", err)
}
break
}
}
// Run the upgrader and the upgrade-steps worker without waiting for
// the upgrade steps to complete.
runner.StartWorker("upgrader", func() (worker.Worker, error) {
return upgrader.NewUpgrader(st.Upgrader(), agentConfig), nil
})
runner.StartWorker("upgrade-steps", func() (worker.Worker, error) {
return a.upgradeWorker(st, entity.Jobs(), agentConfig), nil
})
// All other workers must wait for the upgrade steps to complete
// before starting.
a.startWorkerAfterUpgrade(runner, "machiner", func() (worker.Worker, error) {
return machiner.NewMachiner(st.Machiner(), agentConfig), nil
})
a.startWorkerAfterUpgrade(runner, "apiaddressupdater", func() (worker.Worker, error) {
return apiaddressupdater.NewAPIAddressUpdater(st.Machiner(), a), nil
})
a.startWorkerAfterUpgrade(runner, "logger", func() (worker.Worker, error) {
return workerlogger.NewLogger(st.Logger(), agentConfig), nil
})
a.startWorkerAfterUpgrade(runner, "machineenvironmentworker", func() (worker.Worker, error) {
return machineenvironmentworker.NewMachineEnvironmentWorker(st.Environment(), agentConfig), nil
})
a.startWorkerAfterUpgrade(runner, "rsyslog", func() (worker.Worker, error) {
return newRsyslogConfigWorker(st.Rsyslog(), agentConfig, rsyslogMode)
})
// If not a local provider bootstrap machine, start the worker to
// manage SSH keys.
providerType := agentConfig.Value(agent.ProviderType)
if providerType != provider.Local || a.MachineId != bootstrapMachineId {
a.startWorkerAfterUpgrade(runner, "authenticationworker", func() (worker.Worker, error) {
return authenticationworker.NewWorker(st.KeyUpdater(), agentConfig), nil
})
}
// Perform the operations needed to set up hosting for containers.
if err := a.setupContainerSupport(runner, st, entity, agentConfig); err != nil {
return nil, fmt.Errorf("setting up container support: %v", err)
}
for _, job := range entity.Jobs() {
switch job {
case params.JobHostUnits:
a.startWorkerAfterUpgrade(runner, "deployer", func() (worker.Worker, error) {
apiDeployer := st.Deployer()
context := newDeployContext(apiDeployer, agentConfig)
return deployer.NewDeployer(apiDeployer, context), nil
})
case params.JobManageEnviron:
a.startWorkerAfterUpgrade(singularRunner, "environ-provisioner", func() (worker.Worker, error) {
return provisioner.NewEnvironProvisioner(st.Provisioner(), agentConfig), nil
})
// TODO(axw) 2013-09-24 bug #1229506
// Make another job to enable the firewaller. Not all
// environments are capable of managing ports
// centrally.
a.startWorkerAfterUpgrade(singularRunner, "firewaller", func() (worker.Worker, error) {
return firewaller.NewFirewaller(st.Firewaller())
})
a.startWorkerAfterUpgrade(singularRunner, "charm-revision-updater", func() (worker.Worker, error) {
return charmrevisionworker.NewRevisionUpdateWorker(st.CharmRevisionUpdater()), nil
})
case params.JobManageStateDeprecated:
// Legacy environments may set this, but we ignore it.
default:
// TODO(dimitern): Once all workers moved over to using
// the API, report "unknown job type" here.
}
}
return newCloseWorker(runner, st), nil // Note: a worker.Runner is itself a worker.Worker.
}