예제 #1
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func (s *deployerSuite) TestWatchUnits(c *gc.C) {
	c.Assert(s.resources.Count(), gc.Equals, 0)

	args := params.Entities{Entities: []params.Entity{
		{Tag: "machine-1"},
		{Tag: "machine-0"},
		{Tag: "machine-42"},
	}}
	result, err := s.deployer.WatchUnits(args)
	c.Assert(err, gc.IsNil)
	sort.Strings(result.Results[0].Changes)
	c.Assert(result, gc.DeepEquals, params.StringsWatchResults{
		Results: []params.StringsWatchResult{
			{Changes: []string{"logging/0", "mysql/0"}, StringsWatcherId: "1"},
			{Error: apiservertesting.ErrUnauthorized},
			{Error: apiservertesting.ErrUnauthorized},
		},
	})

	// Verify the resource was registered and stop when done
	c.Assert(s.resources.Count(), gc.Equals, 1)
	c.Assert(result.Results[0].StringsWatcherId, gc.Equals, "1")
	resource := s.resources.Get("1")
	defer statetesting.AssertStop(c, resource)

	// Check that the Watch has consumed the initial event ("returned" in
	// the Watch call)
	wc := statetesting.NewStringsWatcherC(c, s.State, resource.(state.StringsWatcher))
	wc.AssertNoChange()
}
예제 #2
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func (s *deployerSuite) TestWatchUnits(c *gc.C) {
	machine, err := s.st.Machine(s.machine.Tag())
	c.Assert(err, gc.IsNil)
	w, err := machine.WatchUnits()
	c.Assert(err, gc.IsNil)
	defer statetesting.AssertStop(c, w)
	wc := statetesting.NewStringsWatcherC(c, s.BackingState, w)

	// Initial event.
	wc.AssertChange("mysql/0", "logging/0")
	wc.AssertNoChange()

	// Change something other than the lifecycle and make sure it's
	// not detected.
	err = s.subordinate.SetPassword("foo")
	c.Assert(err, gc.IsNil)
	wc.AssertNoChange()

	// Make the subordinate dead and check it's detected.
	err = s.subordinate.EnsureDead()
	c.Assert(err, gc.IsNil)
	wc.AssertChange("logging/0")
	wc.AssertNoChange()

	statetesting.AssertStop(c, w)
	wc.AssertClosed()
}
예제 #3
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func (s *watcherSuite) TestStringsWatcherStopsWithPendingSend(c *gc.C) {
	// Call the Deployer facade's WatchUnits for machine-0.
	var results params.StringsWatchResults
	args := params.Entities{Entities: []params.Entity{{Tag: s.rawMachine.Tag()}}}
	err := s.stateAPI.Call("Deployer", "", "WatchUnits", args, &results)
	c.Assert(err, gc.IsNil)
	c.Assert(results.Results, gc.HasLen, 1)
	result := results.Results[0]
	c.Assert(result.Error, gc.IsNil)

	// Start a StringsWatcher and check the initial event.
	w := watcher.NewStringsWatcher(s.stateAPI, result)
	wc := statetesting.NewStringsWatcherC(c, s.State, w)

	// Create a service, deploy a unit of it on the machine.
	mysql, err := s.State.AddService("mysql", s.AddTestingCharm(c, "mysql"))
	c.Assert(err, gc.IsNil)
	principal, err := mysql.AddUnit()
	c.Assert(err, gc.IsNil)
	err = principal.AssignToMachine(s.rawMachine)
	c.Assert(err, gc.IsNil)

	// Ensure the initial event is delivered. Then test the watcher
	// can be stopped cleanly without reading the pending change.
	s.BackingState.Sync()
	statetesting.AssertCanStopWhenSending(c, w)
	wc.AssertClosed()
}
예제 #4
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func (s *watcherSuite) TestWatchUnitsKeepsEvents(c *gc.C) {
	// Create two services, relate them, and add one unit to each - a
	// principal and a subordinate.
	mysql, err := s.State.AddService("mysql", s.AddTestingCharm(c, "mysql"))
	c.Assert(err, gc.IsNil)
	logging, err := s.State.AddService("logging", s.AddTestingCharm(c, "logging"))
	c.Assert(err, gc.IsNil)
	eps, err := s.State.InferEndpoints([]string{"mysql", "logging"})
	c.Assert(err, gc.IsNil)
	rel, err := s.State.AddRelation(eps...)
	c.Assert(err, gc.IsNil)
	principal, err := mysql.AddUnit()
	c.Assert(err, gc.IsNil)
	err = principal.AssignToMachine(s.rawMachine)
	c.Assert(err, gc.IsNil)
	relUnit, err := rel.Unit(principal)
	c.Assert(err, gc.IsNil)
	err = relUnit.EnterScope(nil)
	c.Assert(err, gc.IsNil)
	subordinate, err := logging.Unit("logging/0")
	c.Assert(err, gc.IsNil)

	// Call the Deployer facade's WatchUnits for machine-0.
	var results params.StringsWatchResults
	args := params.Entities{Entities: []params.Entity{{Tag: s.rawMachine.Tag()}}}
	err = s.stateAPI.Call("Deployer", "", "WatchUnits", args, &results)
	c.Assert(err, gc.IsNil)
	c.Assert(results.Results, gc.HasLen, 1)
	result := results.Results[0]
	c.Assert(result.Error, gc.IsNil)

	// Start a StringsWatcher and check the initial event.
	w := watcher.NewStringsWatcher(s.stateAPI, result)
	wc := statetesting.NewStringsWatcherC(c, s.State, w)
	wc.AssertChange("mysql/0", "logging/0")
	wc.AssertNoChange()

	// Now, without reading any changes advance the lifecycle of both
	// units, inducing an update server-side after each two changes to
	// ensure they're reported as separate events over the API.
	err = subordinate.EnsureDead()
	c.Assert(err, gc.IsNil)
	s.BackingState.Sync()
	err = subordinate.Remove()
	c.Assert(err, gc.IsNil)
	err = principal.EnsureDead()
	c.Assert(err, gc.IsNil)
	s.BackingState.Sync()

	// Expect these changes as 2 separate events, so that
	// nothing gets lost.
	wc.AssertChange("logging/0")
	wc.AssertChange("mysql/0")
	wc.AssertNoChange()

	statetesting.AssertStop(c, w)
	wc.AssertClosed()
}
예제 #5
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func (s *ServiceSuite) TestWatchUnitsLifecycle(c *C) {
	// Empty initial event when no units.
	w := s.mysql.WatchUnits()
	defer testing.AssertStop(c, w)
	wc := testing.NewStringsWatcherC(c, s.State, w)
	wc.AssertChange()
	wc.AssertNoChange()

	// Create one unit, check one change.
	quick, err := s.mysql.AddUnit()
	c.Assert(err, IsNil)
	wc.AssertChange(quick.Name())
	wc.AssertNoChange()

	// Destroy that unit (short-circuited to removal), check one change.
	err = quick.Destroy()
	c.Assert(err, IsNil)
	wc.AssertChange(quick.Name())
	wc.AssertNoChange()

	// Create another, check one change.
	slow, err := s.mysql.AddUnit()
	c.Assert(err, IsNil)
	wc.AssertChange(slow.Name())
	wc.AssertNoChange()

	// Change unit itself, no change.
	preventUnitDestroyRemove(c, slow)
	wc.AssertNoChange()

	// Make unit Dying, change detected.
	err = slow.Destroy()
	c.Assert(err, IsNil)
	wc.AssertChange(slow.Name())
	wc.AssertNoChange()

	// Make unit Dead, change detected.
	err = slow.EnsureDead()
	c.Assert(err, IsNil)
	wc.AssertChange(slow.Name())
	wc.AssertNoChange()

	// Remove unit, final change not detected.
	err = slow.Remove()
	c.Assert(err, IsNil)
	wc.AssertNoChange()
}
예제 #6
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func (s *ServiceSuite) TestWatchUnitsBulkEvents(c *C) {
	// Alive unit...
	alive, err := s.mysql.AddUnit()
	c.Assert(err, IsNil)

	// Dying unit...
	dying, err := s.mysql.AddUnit()
	c.Assert(err, IsNil)
	preventUnitDestroyRemove(c, dying)
	err = dying.Destroy()
	c.Assert(err, IsNil)

	// Dead unit...
	dead, err := s.mysql.AddUnit()
	c.Assert(err, IsNil)
	preventUnitDestroyRemove(c, dead)
	err = dead.Destroy()
	c.Assert(err, IsNil)
	err = dead.EnsureDead()
	c.Assert(err, IsNil)

	// Gone unit.
	gone, err := s.mysql.AddUnit()
	c.Assert(err, IsNil)
	err = gone.Destroy()
	c.Assert(err, IsNil)

	// All except gone unit are reported in initial event.
	w := s.mysql.WatchUnits()
	defer testing.AssertStop(c, w)
	wc := testing.NewStringsWatcherC(c, s.State, w)
	wc.AssertChange(alive.Name(), dying.Name(), dead.Name())
	wc.AssertNoChange()

	// Remove them all; alive/dying changes reported; dead never mentioned again.
	err = alive.Destroy()
	c.Assert(err, IsNil)
	err = dying.EnsureDead()
	c.Assert(err, IsNil)
	err = dying.Remove()
	c.Assert(err, IsNil)
	err = dead.Remove()
	c.Assert(err, IsNil)
	wc.AssertChange(alive.Name(), dying.Name())
	wc.AssertNoChange()
}
예제 #7
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func (s *UnitSuite) TestWatchSubordinates(c *C) {
	w := s.unit.WatchSubordinateUnits()
	defer testing.AssertStop(c, w)
	wc := testing.NewStringsWatcherC(c, s.State, w)
	wc.AssertChange()
	wc.AssertNoChange()

	// Add a couple of subordinates, check change.
	subCharm := s.AddTestingCharm(c, "logging")
	var subUnits []*state.Unit
	for i := 0; i < 2; i++ {
		// Note: subordinate units can only be created as a side effect of a
		// principal entering scope; and a given principal can only have a
		// single subordinate unit of each service.
		name := "logging" + strconv.Itoa(i)
		subSvc, err := s.State.AddService(name, subCharm)
		c.Assert(err, IsNil)
		eps, err := s.State.InferEndpoints([]string{name, "wordpress"})
		c.Assert(err, IsNil)
		rel, err := s.State.AddRelation(eps...)
		c.Assert(err, IsNil)
		ru, err := rel.Unit(s.unit)
		c.Assert(err, IsNil)
		err = ru.EnterScope(nil)
		c.Assert(err, IsNil)
		units, err := subSvc.AllUnits()
		c.Assert(err, IsNil)
		c.Assert(units, HasLen, 1)
		subUnits = append(subUnits, units[0])
	}
	wc.AssertChange(subUnits[0].Name(), subUnits[1].Name())
	wc.AssertNoChange()

	// Set one to Dying, check change.
	err := subUnits[0].Destroy()
	c.Assert(err, IsNil)
	wc.AssertChange(subUnits[0].Name())
	wc.AssertNoChange()

	// Set both to Dead, and remove one; check change.
	err = subUnits[0].EnsureDead()
	c.Assert(err, IsNil)
	err = subUnits[1].EnsureDead()
	c.Assert(err, IsNil)
	err = subUnits[1].Remove()
	c.Assert(err, IsNil)
	wc.AssertChange(subUnits[0].Name(), subUnits[1].Name())
	wc.AssertNoChange()

	// Stop watcher, check closed.
	testing.AssertStop(c, w)
	wc.AssertClosed()

	// Start a new watch, check Dead unit is reported.
	w = s.unit.WatchSubordinateUnits()
	defer testing.AssertStop(c, w)
	wc = testing.NewStringsWatcherC(c, s.State, w)
	wc.AssertChange(subUnits[0].Name())
	wc.AssertNoChange()

	// Remove the leftover, check no change.
	err = subUnits[0].Remove()
	c.Assert(err, IsNil)
	wc.AssertNoChange()
}
예제 #8
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func (s *ServiceSuite) TestWatchRelations(c *C) {
	// TODO(fwereade) split this test up a bit.
	w := s.mysql.WatchRelations()
	defer testing.AssertStop(c, w)
	wc := testing.NewStringsWatcherC(c, s.State, w)
	wc.AssertChange()
	wc.AssertNoChange()

	// Add a relation; check change.
	mysqlep, err := s.mysql.Endpoint("server")
	c.Assert(err, IsNil)
	wpch := s.AddTestingCharm(c, "wordpress")
	wpi := 0
	addRelation := func() *state.Relation {
		name := fmt.Sprintf("wp%d", wpi)
		wpi++
		wp, err := s.State.AddService(name, wpch)
		c.Assert(err, IsNil)
		wpep, err := wp.Endpoint("db")
		c.Assert(err, IsNil)
		rel, err := s.State.AddRelation(mysqlep, wpep)
		c.Assert(err, IsNil)
		return rel
	}
	rel0 := addRelation()
	wc.AssertChange(rel0.String())
	wc.AssertNoChange()

	// Add another relation; check change.
	rel1 := addRelation()
	wc.AssertChange(rel1.String())
	wc.AssertNoChange()

	// Destroy a relation; check change.
	err = rel0.Destroy()
	c.Assert(err, IsNil)
	wc.AssertChange(rel0.String())
	wc.AssertNoChange()

	// Stop watcher; check change chan is closed.
	testing.AssertStop(c, w)
	wc.AssertClosed()

	// Add a new relation; start a new watcher; check initial event.
	rel2 := addRelation()
	w = s.mysql.WatchRelations()
	defer testing.AssertStop(c, w)
	wc = testing.NewStringsWatcherC(c, s.State, w)
	wc.AssertChange(rel1.String(), rel2.String())
	wc.AssertNoChange()

	// Add a unit to the new relation; check no change.
	unit, err := s.mysql.AddUnit()
	c.Assert(err, IsNil)
	ru2, err := rel2.Unit(unit)
	c.Assert(err, IsNil)
	err = ru2.EnterScope(nil)
	c.Assert(err, IsNil)
	wc.AssertNoChange()

	// Destroy the relation with the unit in scope, and add another; check
	// changes.
	err = rel2.Destroy()
	c.Assert(err, IsNil)
	rel3 := addRelation()
	wc.AssertChange(rel2.String(), rel3.String())
	wc.AssertNoChange()

	// Leave scope, destroying the relation, and check that change as well.
	err = ru2.LeaveScope()
	c.Assert(err, IsNil)
	wc.AssertChange(rel2.String())
	wc.AssertNoChange()
}
예제 #9
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func (s *MachineSuite) TestWatchUnits(c *C) {
	// Start a watch on an empty machine; check no units reported.
	w := s.machine.WatchUnits()
	defer testing.AssertStop(c, w)
	wc := testing.NewStringsWatcherC(c, s.State, w)
	wc.AssertChange()
	wc.AssertNoChange()

	// Change machine; no change.
	err := s.machine.SetProvisioned("cheese", "fake_nonce", nil)
	c.Assert(err, IsNil)
	wc.AssertNoChange()

	// Assign a unit (to a separate instance); change detected.
	mysql, err := s.State.AddService("mysql", s.AddTestingCharm(c, "mysql"))
	c.Assert(err, IsNil)
	mysql0, err := mysql.AddUnit()
	c.Assert(err, IsNil)
	machine, err := s.State.Machine(s.machine.Id())
	c.Assert(err, IsNil)
	err = mysql0.AssignToMachine(machine)
	c.Assert(err, IsNil)
	wc.AssertChange("mysql/0")
	wc.AssertNoChange()

	// Change the unit; no change.
	err = mysql0.SetStatus(params.StatusStarted, "")
	c.Assert(err, IsNil)
	wc.AssertNoChange()

	// Assign another unit and make the first Dying; check both changes detected.
	mysql1, err := mysql.AddUnit()
	c.Assert(err, IsNil)
	err = mysql1.AssignToMachine(machine)
	c.Assert(err, IsNil)
	err = mysql0.Destroy()
	c.Assert(err, IsNil)
	wc.AssertChange("mysql/0", "mysql/1")
	wc.AssertNoChange()

	// Add a subordinate to the Alive unit; change detected.
	logging, err := s.State.AddService("logging", s.AddTestingCharm(c, "logging"))
	c.Assert(err, IsNil)
	eps, err := s.State.InferEndpoints([]string{"mysql", "logging"})
	c.Assert(err, IsNil)
	rel, err := s.State.AddRelation(eps...)
	c.Assert(err, IsNil)
	mysqlru1, err := rel.Unit(mysql1)
	c.Assert(err, IsNil)
	err = mysqlru1.EnterScope(nil)
	c.Assert(err, IsNil)
	logging0, err := logging.Unit("logging/0")
	c.Assert(err, IsNil)
	wc.AssertChange("logging/0")
	wc.AssertNoChange()

	// Change the subordinate; no change.
	err = logging0.SetStatus(params.StatusStarted, "")
	c.Assert(err, IsNil)
	wc.AssertNoChange()

	// Make the Dying unit Dead; change detected.
	err = mysql0.EnsureDead()
	c.Assert(err, IsNil)
	wc.AssertChange("mysql/0")
	wc.AssertNoChange()

	// Stop watcher; check Changes chan closed.
	testing.AssertStop(c, w)
	wc.AssertClosed()

	// Start a fresh watcher; check all units reported.
	w = s.machine.WatchUnits()
	defer testing.AssertStop(c, w)
	wc = testing.NewStringsWatcherC(c, s.State, w)
	wc.AssertChange("mysql/0", "mysql/1", "logging/0")
	wc.AssertNoChange()

	// Remove the Dead unit; no change.
	err = mysql0.Remove()
	c.Assert(err, IsNil)
	wc.AssertNoChange()

	// Destroy the subordinate; change detected.
	err = logging0.Destroy()
	c.Assert(err, IsNil)
	wc.AssertChange("logging/0")
	wc.AssertNoChange()

	// Unassign the principal; check subordinate departure also reported.
	err = mysql1.UnassignFromMachine()
	c.Assert(err, IsNil)
	wc.AssertChange("mysql/1", "logging/0")
	wc.AssertNoChange()
}