// NewDeployer returns a Worker that deploys and recalls unit agents
// via ctx, taking a machine id to operate on.
func NewDeployer(st *apideployer.State, ctx Context) worker.Worker {
d := &Deployer{
st: st,
ctx: ctx,
}
return worker.NewStringsWorker(d)
}
func (s *stringsWorkerSuite) SetUpTest(c *gc.C) {
s.LoggingSuite.SetUpTest(c)
s.actor = &stringsHandler{
actions: nil,
handled: make(chan []string, 1),
watcher: &testStringsWatcher{
changes: make(chan []string),
},
}
s.worker = worker.NewStringsWorker(s.actor)
}
func (s *ContainerSetupSuite) setupContainerWorker(c *gc.C, tag string) {
runner := worker.NewRunner(allFatal, noImportance)
pr := s.st.Provisioner()
machine, err := pr.Machine(tag)
c.Assert(err, gc.IsNil)
err = machine.SetSupportedContainers(instance.ContainerTypes...)
c.Assert(err, gc.IsNil)
cfg := s.AgentConfigForTag(c, tag)
watcherName := fmt.Sprintf("%s-container-watcher", machine.Id())
handler := provisioner.NewContainerSetupHandler(runner, watcherName, instance.ContainerTypes, machine, pr, cfg)
runner.StartWorker(watcherName, func() (worker.Worker, error) {
return worker.NewStringsWorker(handler), nil
})
go func() {
runner.Wait()
}()
}
func (s *stringsWorkerSuite) TestHandleErrorStopsWorkerAndWatcher(c *gc.C) {
s.stopWorker(c)
actor := &stringsHandler{
actions: nil,
handled: make(chan []string, 1),
handlerError: fmt.Errorf("my handling error"),
watcher: &testStringsWatcher{
changes: make(chan []string),
},
}
w := worker.NewStringsWorker(actor)
actor.watcher.TriggerChange(c, []string{"aa", "bb"})
waitForHandledStrings(c, actor.handled, []string{"aa", "bb"})
err := waitShort(c, w)
c.Check(err, gc.ErrorMatches, "my handling error")
actor.CheckActions(c, "setup", "handler", "teardown")
c.Check(actor.watcher.stopped, jc.IsTrue)
}
func (s *stringsWorkerSuite) TestSetUpFailureStopsWithTearDown(c *gc.C) {
// Stop the worker and SetUp again, this time with an error
s.stopWorker(c)
actor := &stringsHandler{
actions: nil,
handled: make(chan []string, 1),
setupError: fmt.Errorf("my special error"),
watcher: &testStringsWatcher{
changes: make(chan []string),
},
}
w := worker.NewStringsWorker(actor)
err := waitShort(c, w)
c.Check(err, gc.ErrorMatches, "my special error")
// TearDown is not called on SetUp error.
actor.CheckActions(c, "setup")
c.Check(actor.watcher.stopped, jc.IsTrue)
}
// updateSupportedContainers records in state that a machine can run the specified containers.
// It starts a watcher and when a container of a given type is first added to the machine,
// the watcher is killed, the machine is set up to be able to start containers of the given type,
// and a suitable provisioner is started.
func (a *MachineAgent) updateSupportedContainers(
runner worker.Runner,
st *api.State,
tag string,
containers []instance.ContainerType,
agentConfig agent.Config,
) error {
pr := st.Provisioner()
machine, err := pr.Machine(tag)
if err != nil {
return fmt.Errorf("%s is not in state: %v", tag, err)
}
if len(containers) == 0 {
if err := machine.SupportsNoContainers(); err != nil {
return fmt.Errorf("clearing supported containers for %s: %v", tag, err)
}
return nil
}
if err := machine.SetSupportedContainers(containers...); err != nil {
return fmt.Errorf("setting supported containers for %s: %v", tag, err)
}
// Start the watcher to fire when a container is first requested on the machine.
watcherName := fmt.Sprintf("%s-container-watcher", machine.Id())
handler := provisioner.NewContainerSetupHandler(
runner,
watcherName,
containers,
machine,
pr,
agentConfig,
)
a.startWorkerAfterUpgrade(runner, watcherName, func() (worker.Worker, error) {
return worker.NewStringsWorker(handler), nil
})
return nil
}
// NewMinUnitsWorker returns a Worker that runs service.EnsureMinUnits()
// if the number of alive units belonging to a service decreases, or if the
// minimum required number of units for a service is increased.
func NewMinUnitsWorker(st *state.State) worker.Worker {
mu := &MinUnitsWorker{st: st}
return worker.NewStringsWorker(mu)
}