func (s *minUnitsWorkerSuite) TestMinUnitsWorker(c *gc.C) {
mu := minunitsworker.NewMinUnitsWorker(s.State)
defer func() { c.Assert(worker.Stop(mu), gc.IsNil) }()
// Set up services and units for later use.
wordpress, err := s.State.AddService("wordpress", s.AddTestingCharm(c, "wordpress"))
c.Assert(err, gc.IsNil)
mysql, err := s.State.AddService("mysql", s.AddTestingCharm(c, "mysql"))
c.Assert(err, gc.IsNil)
unit, err := wordpress.AddUnit()
c.Assert(err, gc.IsNil)
_, err = wordpress.AddUnit()
c.Assert(err, gc.IsNil)
// Set up minimum units for services.
err = wordpress.SetMinUnits(3)
c.Assert(err, gc.IsNil)
err = mysql.SetMinUnits(2)
c.Assert(err, gc.IsNil)
// Remove a unit for a service.
err = unit.Destroy()
c.Assert(err, gc.IsNil)
timeout := time.After(coretesting.LongWait)
for {
s.State.StartSync()
select {
case <-time.After(coretesting.ShortWait):
wordpressUnits, err := wordpress.AllUnits()
c.Assert(err, gc.IsNil)
mysqlUnits, err := mysql.AllUnits()
c.Assert(err, gc.IsNil)
wordpressCount := len(wordpressUnits)
mysqlCount := len(mysqlUnits)
if wordpressCount == 3 && mysqlCount == 2 {
return
}
logger.Infof("wordpress units: %d; mysql units: %d", wordpressCount, mysqlCount)
case <-timeout:
c.Fatalf("timed out waiting for minunits events")
}
}
}
// StateJobs returns a worker running all the workers that require
// a *state.State connection.
func (a *MachineAgent) StateWorker() (worker.Worker, error) {
st, entity, err := openState(a.Conf.Conf, a)
if err != nil {
return nil, err
}
reportOpenedState(st)
m := entity.(*state.Machine)
// TODO(rog) use more discriminating test for errors
// rather than taking everything down indiscriminately.
dataDir := a.Conf.DataDir
runner := worker.NewRunner(allFatal, moreImportant)
// At this stage, since we don't embed lxc containers, just start an lxc
// provisioner task for non-lxc containers. Since we have only LXC
// containers and normal machines, this effectively means that we only
// have an LXC provisioner when we have a normally provisioned machine
// (through the environ-provisioner). With the upcoming advent of KVM
// containers, it is likely that we will want an LXC provisioner on a KVM
// machine, and once we get nested LXC containers, we can remove this
// check.
providerType := os.Getenv(osenv.JujuProviderType)
if providerType != provider.Local && m.ContainerType() != instance.LXC {
workerName := fmt.Sprintf("%s-provisioner", provisioner.LXC)
runner.StartWorker(workerName, func() (worker.Worker, error) {
return provisioner.NewProvisioner(provisioner.LXC, st, a.MachineId, dataDir), nil
})
}
// Take advantage of special knowledge here in that we will only ever want
// the storage provider on one machine, and that is the "bootstrap" node.
if providerType == provider.Local && m.Id() == bootstrapMachineId {
runner.StartWorker("local-storage", func() (worker.Worker, error) {
return localstorage.NewWorker(), nil
})
}
for _, job := range m.Jobs() {
switch job {
case state.JobHostUnits:
// Implemented in APIWorker.
case state.JobManageEnviron:
runner.StartWorker("environ-provisioner", func() (worker.Worker, error) {
return provisioner.NewProvisioner(provisioner.ENVIRON, st, a.MachineId, dataDir), nil
})
runner.StartWorker("firewaller", func() (worker.Worker, error) {
return firewaller.NewFirewaller(st), nil
})
case state.JobManageState:
runner.StartWorker("apiserver", func() (worker.Worker, error) {
// If the configuration does not have the required information,
// it is currently not a recoverable error, so we kill the whole
// agent, potentially enabling human intervention to fix
// the agent's configuration file. In the future, we may retrieve
// the state server certificate and key from the state, and
// this should then change.
if len(a.Conf.StateServerCert) == 0 || len(a.Conf.StateServerKey) == 0 {
return nil, &fatalError{"configuration does not have state server cert/key"}
}
return apiserver.NewServer(st, fmt.Sprintf(":%d", a.Conf.APIPort), a.Conf.StateServerCert, a.Conf.StateServerKey)
})
runner.StartWorker("cleaner", func() (worker.Worker, error) {
return cleaner.NewCleaner(st), nil
})
runner.StartWorker("resumer", func() (worker.Worker, error) {
// The action of resumer is so subtle that it is not tested,
// because we can't figure out how to do so without brutalising
// the transaction log.
return resumer.NewResumer(st), nil
})
runner.StartWorker("minunitsworker", func() (worker.Worker, error) {
return minunitsworker.NewMinUnitsWorker(st), nil
})
default:
log.Warningf("ignoring unknown job %q", job)
}
}
return newCloseWorker(runner, st), nil
}