// SupportsSpaces checks if the environment implements NetworkingEnviron
// and also if it supports spaces.
func SupportsSpaces(backing environs.EnvironConfigGetter) error {
env, err := environs.GetEnviron(backing, environs.New)
if err != nil {
return errors.Annotate(err, "getting environ")
}
if !environs.SupportsSpaces(env) {
return errors.NotSupportedf("spaces")
}
return nil
}
// startStateWorkers returns a worker running all the workers that
// require a *state.State connection.
func (a *MachineAgent) startStateWorkers(st *state.State) (worker.Worker, error) {
agentConfig := a.CurrentConfig()
m, err := getMachine(st, agentConfig.Tag())
if err != nil {
return nil, errors.Annotate(err, "machine lookup")
}
runner := newConnRunner(st)
singularRunner, err := newSingularStateRunner(runner, st, m)
if err != nil {
return nil, errors.Trace(err)
}
for _, job := range m.Jobs() {
switch job {
case state.JobHostUnits:
// Implemented elsewhere with workers that use the API.
case state.JobManageModel:
useMultipleCPUs()
a.startWorkerAfterUpgrade(runner, "model worker manager", func() (worker.Worker, error) {
w, err := modelworkermanager.New(modelworkermanager.Config{
ControllerUUID: st.ControllerUUID(),
Backend: st,
NewWorker: a.startModelWorkers,
ErrorDelay: worker.RestartDelay,
})
if err != nil {
return nil, errors.Annotate(err, "cannot start model worker manager")
}
return w, nil
})
a.startWorkerAfterUpgrade(runner, "peergrouper", func() (worker.Worker, error) {
env, err := stateenvirons.GetNewEnvironFunc(environs.New)(st)
if err != nil {
return nil, errors.Annotate(err, "getting environ from state")
}
supportsSpaces := environs.SupportsSpaces(env)
w, err := peergrouperNew(st, supportsSpaces)
if err != nil {
return nil, errors.Annotate(err, "cannot start peergrouper worker")
}
return w, nil
})
a.startWorkerAfterUpgrade(runner, "restore", func() (worker.Worker, error) {
w, err := a.newRestoreStateWatcherWorker(st)
if err != nil {
return nil, errors.Annotate(err, "cannot start backup-restorer worker")
}
return w, nil
})
a.startWorkerAfterUpgrade(runner, "mongoupgrade", func() (worker.Worker, error) {
return newUpgradeMongoWorker(st, a.machineId, a.maybeStopMongo)
})
// certChangedChan is shared by multiple workers it's up
// to the agent to close it rather than any one of the
// workers. It is possible that multiple cert changes
// come in before the apiserver is up to receive them.
// Specify a bigger buffer to prevent deadlock when
// the apiserver isn't up yet. Use a size of 10 since we
// allow up to 7 controllers, and might also update the
// addresses of the local machine (127.0.0.1, ::1, etc).
//
// TODO(cherylj/waigani) Remove this workaround when
// certupdater and apiserver can properly manage dependencies
// through the dependency engine.
//
// TODO(ericsnow) For now we simply do not close the channel.
certChangedChan := make(chan params.StateServingInfo, 10)
// Each time apiserver worker is restarted, we need a fresh copy of state due
// to the fact that state holds lease managers which are killed and need to be reset.
stateOpener := func() (*state.State, error) {
logger.Debugf("opening state for apiserver worker")
st, _, err := openState(agentConfig, stateWorkerDialOpts)
return st, err
}
runner.StartWorker("apiserver", a.apiserverWorkerStarter(stateOpener, certChangedChan))
var stateServingSetter certupdater.StateServingInfoSetter = func(info params.StateServingInfo, done <-chan struct{}) error {
return a.ChangeConfig(func(config agent.ConfigSetter) error {
config.SetStateServingInfo(info)
logger.Infof("update apiserver worker with new certificate")
select {
case certChangedChan <- info:
return nil
case <-done:
return nil
}
})
}
a.startWorkerAfterUpgrade(runner, "certupdater", func() (worker.Worker, error) {
return newCertificateUpdater(m, agentConfig, st, st, stateServingSetter), nil
})
a.startWorkerAfterUpgrade(singularRunner, "dblogpruner", func() (worker.Worker, error) {
return dblogpruner.New(st, dblogpruner.NewLogPruneParams()), nil
})
a.startWorkerAfterUpgrade(singularRunner, "txnpruner", func() (worker.Worker, error) {
return txnpruner.New(st, time.Hour*2, clock.WallClock), nil
})
default:
return nil, errors.Errorf("unknown job type %q", job)
}
}
return runner, nil
}