func (s *relationUnitSuite) TestWatchRelationUnits(c *gc.C) {
// Enter scope with mysqlUnit.
myRelUnit, err := s.stateRelation.Unit(s.mysqlUnit)
c.Assert(err, gc.IsNil)
err = myRelUnit.EnterScope(nil)
c.Assert(err, gc.IsNil)
s.assertInScope(c, myRelUnit, true)
apiRel, err := s.uniter.Relation(s.stateRelation.Tag())
c.Assert(err, gc.IsNil)
apiUnit, err := s.uniter.Unit("unit-wordpress-0")
c.Assert(err, gc.IsNil)
apiRelUnit, err := apiRel.Unit(apiUnit)
c.Assert(err, gc.IsNil)
w, err := apiRelUnit.Watch()
defer statetesting.AssertStop(c, w)
wc := statetesting.NewRelationUnitsWatcherC(c, s.BackingState, w)
// Initial event.
wc.AssertChange([]string{"mysql/0"}, nil)
// Leave scope with mysqlUnit, check it's detected.
err = myRelUnit.LeaveScope()
c.Assert(err, gc.IsNil)
s.assertInScope(c, myRelUnit, false)
wc.AssertChange(nil, []string{"mysql/0"})
// Non-change is not reported.
err = myRelUnit.LeaveScope()
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
// NOTE: This test is not as exhaustive as the one in state,
// because the watcher is already tested there. Here we just
// ensure we get the events when we expect them and don't get
// them when they're not expected.
statetesting.AssertStop(c, w)
wc.AssertClosed()
}
func (s *WatchScopeSuite) TestPeer(c *gc.C) {
// Create a service and get a peer relation.
riak := s.AddTestingService(c, "riak", s.AddTestingCharm(c, "riak"))
riakEP, err := riak.Endpoint("ring")
c.Assert(err, gc.IsNil)
rels, err := riak.Relations()
c.Assert(err, gc.IsNil)
c.Assert(rels, gc.HasLen, 1)
rel := rels[0]
// Add some units to the service and set their private addresses; get
// the relevant RelationUnits.
// (Private addresses should be set by their unit agents on
// startup; this test does not include that, but Join expects
// the information to be available, and uses it to populate the
// relation settings node.)
addUnit := func(i int) *state.RelationUnit {
unit, err := riak.AddUnit()
c.Assert(err, gc.IsNil)
err = unit.AssignToNewMachine()
c.Assert(err, gc.IsNil)
mId, err := unit.AssignedMachineId()
c.Assert(err, gc.IsNil)
machine, err := s.State.Machine(mId)
c.Assert(err, gc.IsNil)
privateAddr := instance.NewAddress(fmt.Sprintf("riak%d.example.com", i), instance.NetworkCloudLocal)
machine.SetAddresses(privateAddr)
ru, err := rel.Unit(unit)
c.Assert(err, gc.IsNil)
c.Assert(ru.Endpoint(), gc.Equals, riakEP)
return ru
}
ru0 := addUnit(0)
ru1 := addUnit(1)
ru2 := addUnit(2)
// ---------- Single unit ----------
// Start watching the relation from the perspective of the first unit.
w0 := ru0.Watch()
defer testing.AssertStop(c, w0)
w0c := testing.NewRelationUnitsWatcherC(c, s.State, w0)
w0c.AssertChange(nil, nil)
w0c.AssertNoChange()
// Join the first unit to the relation, and change the settings, and
// check that nothing apparently happens.
err = ru0.EnterScope(nil)
c.Assert(err, gc.IsNil)
changeSettings(c, ru0)
w0c.AssertNoChange()
// ---------- Two units ----------
// Now join another unit to the relation...
err = ru1.EnterScope(nil)
c.Assert(err, gc.IsNil)
// ...and check that the first relation unit sees the change.
expectChanged := []string{"riak/1"}
w0c.AssertChange(expectChanged, nil)
w0c.AssertNoChange()
// Join again, check it's a no-op.
err = ru1.EnterScope(nil)
c.Assert(err, gc.IsNil)
w0c.AssertNoChange()
// Start watching the relation from the perspective of the second unit,
// and check that it sees the right state.
w1 := ru1.Watch()
defer testing.AssertStop(c, w1)
w1c := testing.NewRelationUnitsWatcherC(c, s.State, w1)
expectChanged = []string{"riak/0"}
w1c.AssertChange(expectChanged, nil)
w1c.AssertNoChange()
// ---------- Three units ----------
// Whoa, it works. Ok, check the third unit's opinion of the state.
w2 := ru2.Watch()
defer testing.AssertStop(c, w2)
w2c := testing.NewRelationUnitsWatcherC(c, s.State, w2)
expectChanged = []string{"riak/0", "riak/1"}
w2c.AssertChange(expectChanged, nil)
w2c.AssertNoChange()
// Join the third unit, and check the first and second units see it.
err = ru2.EnterScope(nil)
c.Assert(err, gc.IsNil)
expectChanged = []string{"riak/2"}
w0c.AssertChange(expectChanged, nil)
w0c.AssertNoChange()
w1c.AssertChange(expectChanged, nil)
w1c.AssertNoChange()
// Change the second unit's settings, and check that only
// the first and third see changes.
changeSettings(c, ru1)
w1c.AssertNoChange()
expectChanged = []string{"riak/1"}
w0c.AssertChange(expectChanged, nil)
w0c.AssertNoChange()
w2c.AssertChange(expectChanged, nil)
w2c.AssertNoChange()
// ---------- Two units again ----------
// Depart the second unit, and check that the first and third detect it.
err = ru1.LeaveScope()
c.Assert(err, gc.IsNil)
expectDeparted := []string{"riak/1"}
w0c.AssertChange(nil, expectDeparted)
w0c.AssertNoChange()
w2c.AssertChange(nil, expectDeparted)
w2c.AssertNoChange()
// Change its settings, and check the others don't observe anything.
changeSettings(c, ru1)
w0c.AssertNoChange()
w2c.AssertNoChange()
// Check no spurious events showed up on the second unit's watch, and check
// it closes cleanly.
w1c.AssertNoChange()
testing.AssertStop(c, w1)
// OK, we're done here. Cleanup, and error detection during same,
// will be handled by the deferred kill/stop calls. Phew.
}
func (s *WatchScopeSuite) TestProviderRequirerGlobal(c *gc.C) {
// Create a pair of services and a relation between them.
mysql := s.AddTestingService(c, "mysql", s.AddTestingCharm(c, "mysql"))
mysqlEP, err := mysql.Endpoint("server")
c.Assert(err, gc.IsNil)
wordpress := s.AddTestingService(c, "wordpress", s.AddTestingCharm(c, "wordpress"))
wordpressEP, err := wordpress.Endpoint("db")
c.Assert(err, gc.IsNil)
rel, err := s.State.AddRelation(mysqlEP, wordpressEP)
c.Assert(err, gc.IsNil)
// Add some units to the services and set their private addresses.
addUnit := func(srv *state.Service, sub string, ep state.Endpoint) *state.RelationUnit {
unit, err := srv.AddUnit()
c.Assert(err, gc.IsNil)
ru, err := rel.Unit(unit)
c.Assert(err, gc.IsNil)
c.Assert(ru.Endpoint(), gc.Equals, ep)
return ru
}
msru0 := addUnit(mysql, "ms0", mysqlEP)
msru1 := addUnit(mysql, "ms1", mysqlEP)
wpru0 := addUnit(wordpress, "wp0", wordpressEP)
wpru1 := addUnit(wordpress, "wp1", wordpressEP)
// ---------- Single role active ----------
// Watch the relation from the perspective of the first provider unit and
// check initial event.
msw0 := msru0.Watch()
defer testing.AssertStop(c, msw0)
msw0c := testing.NewRelationUnitsWatcherC(c, s.State, msw0)
msw0c.AssertChange(nil, nil)
msw0c.AssertNoChange()
// Join the unit to the relation, change its settings, and check that
// nothing apparently happens.
err = msru0.EnterScope(nil)
c.Assert(err, gc.IsNil)
changeSettings(c, msru0)
msw0c.AssertNoChange()
// Join the second provider unit, start its watch, and check what it thinks the
// state of the relation is.
err = msru1.EnterScope(nil)
c.Assert(err, gc.IsNil)
msw1 := msru1.Watch()
defer testing.AssertStop(c, msw1)
msw1c := testing.NewRelationUnitsWatcherC(c, s.State, msw1)
msw1c.AssertChange(nil, nil)
msw1c.AssertNoChange()
// Change the unit's settings, and check that neither provider unit
// observes any change.
changeSettings(c, msru1)
msw1c.AssertNoChange()
msw0c.AssertNoChange()
// ---------- Two roles active ----------
// Start watches from both requirer units' perspectives, and check that
// they see the provider units.
expectChanged := []string{"mysql/0", "mysql/1"}
wpw0 := wpru0.Watch()
defer testing.AssertStop(c, wpw0)
wpw0c := testing.NewRelationUnitsWatcherC(c, s.State, wpw0)
wpw0c.AssertChange(expectChanged, nil)
wpw0c.AssertNoChange()
wpw1 := wpru1.Watch()
defer testing.AssertStop(c, wpw1)
wpw1c := testing.NewRelationUnitsWatcherC(c, s.State, wpw1)
wpw1c.AssertChange(expectChanged, nil)
wpw1c.AssertNoChange()
// Join the first requirer unit, and check the provider units see it.
err = wpru0.EnterScope(nil)
c.Assert(err, gc.IsNil)
expectChanged = []string{"wordpress/0"}
msw0c.AssertChange(expectChanged, nil)
msw0c.AssertNoChange()
msw1c.AssertChange(expectChanged, nil)
msw1c.AssertNoChange()
// Join again, check no-op.
err = wpru0.EnterScope(nil)
c.Assert(err, gc.IsNil)
msw0c.AssertNoChange()
msw1c.AssertNoChange()
// Join the second requirer, and check the provider units see the change.
err = wpru1.EnterScope(nil)
c.Assert(err, gc.IsNil)
expectChanged = []string{"wordpress/1"}
msw0c.AssertChange(expectChanged, nil)
msw0c.AssertNoChange()
msw1c.AssertChange(expectChanged, nil)
msw1c.AssertNoChange()
// Verify that neither requirer has observed any change to the relation.
wpw0c.AssertNoChange()
wpw1c.AssertNoChange()
// Change settings for the first requirer, check providers see it...
changeSettings(c, wpru0)
expectChanged = []string{"wordpress/0"}
msw0c.AssertChange(expectChanged, nil)
msw0c.AssertNoChange()
msw1c.AssertChange(expectChanged, nil)
msw1c.AssertNoChange()
// ...and requirers don't.
wpw0c.AssertNoChange()
wpw1c.AssertNoChange()
// Depart the second requirer and check the providers see it...
err = wpru1.LeaveScope()
c.Assert(err, gc.IsNil)
expectDeparted := []string{"wordpress/1"}
msw0c.AssertChange(nil, expectDeparted)
msw0c.AssertNoChange()
msw1c.AssertChange(nil, expectDeparted)
msw1c.AssertNoChange()
// ...and the requirers don't.
wpw0c.AssertNoChange()
wpw1c.AssertNoChange()
// Cleanup handled by defers as before.
}
func (s *WatchScopeSuite) TestProviderRequirerContainer(c *gc.C) {
// Create a pair of services and a relation between them.
mysql := s.AddTestingService(c, "mysql", s.AddTestingCharm(c, "mysql"))
mysqlEP, err := mysql.Endpoint("juju-info")
c.Assert(err, gc.IsNil)
logging := s.AddTestingService(c, "logging", s.AddTestingCharm(c, "logging"))
loggingEP, err := logging.Endpoint("info")
c.Assert(err, gc.IsNil)
rel, err := s.State.AddRelation(mysqlEP, loggingEP)
c.Assert(err, gc.IsNil)
// Change mysqlEP to match the endpoint that will actually be used by the relation.
mysqlEP.Scope = charm.ScopeContainer
// Add some units to the services and set their private addresses.
addUnits := func(i int) (*state.RelationUnit, *state.RelationUnit) {
msu, err := mysql.AddUnit()
c.Assert(err, gc.IsNil)
msru, err := rel.Unit(msu)
c.Assert(err, gc.IsNil)
c.Assert(msru.Endpoint(), gc.Equals, mysqlEP)
err = msru.EnterScope(nil)
c.Assert(err, gc.IsNil)
err = msru.LeaveScope()
c.Assert(err, gc.IsNil)
lgu, err := s.State.Unit("logging/" + strconv.Itoa(i))
c.Assert(err, gc.IsNil)
lgru, err := rel.Unit(lgu)
c.Assert(err, gc.IsNil)
c.Assert(lgru.Endpoint(), gc.Equals, loggingEP)
return msru, lgru
}
msru0, lgru0 := addUnits(0)
msru1, lgru1 := addUnits(1)
// ---------- Single role active ----------
// Start watching the relation from the perspective of the first unit, and
// check the initial event.
msw0 := msru0.Watch()
defer testing.AssertStop(c, msw0)
msw0c := testing.NewRelationUnitsWatcherC(c, s.State, msw0)
msw0c.AssertChange(nil, nil)
msw0c.AssertNoChange()
// Join the unit to the relation, change its settings, and check that
// nothing apparently happens.
err = msru0.EnterScope(nil)
c.Assert(err, gc.IsNil)
changeSettings(c, msru0)
msw0c.AssertNoChange()
// Watch the relation from the perspective of the second provider, and
// check initial event.
msw1 := msru1.Watch()
defer testing.AssertStop(c, msw1)
msw1c := testing.NewRelationUnitsWatcherC(c, s.State, msw1)
msw1c.AssertChange(nil, nil)
msw1c.AssertNoChange()
// Join the second provider unit to the relation, and check that neither
// watching unit observes any change.
err = msru1.EnterScope(nil)
c.Assert(err, gc.IsNil)
msw1c.AssertNoChange()
msw0c.AssertNoChange()
// Change the unit's settings, and check that nothing apparently happens.
changeSettings(c, msru1)
msw1c.AssertNoChange()
msw0c.AssertNoChange()
// ---------- Two roles active ----------
// Start a watch from the first requirer unit's perspective, and check it
// only sees the first provider (with which it shares a container).
lgw0 := lgru0.Watch()
defer testing.AssertStop(c, lgw0)
lgw0c := testing.NewRelationUnitsWatcherC(c, s.State, lgw0)
expectChanged := []string{"mysql/0"}
lgw0c.AssertChange(expectChanged, nil)
lgw0c.AssertNoChange()
// Join the first requirer unit, and check that only the first provider
// observes the change.
err = lgru0.EnterScope(nil)
c.Assert(err, gc.IsNil)
expectChanged = []string{"logging/0"}
msw0c.AssertChange(expectChanged, nil)
msw0c.AssertNoChange()
msw1c.AssertNoChange()
lgw0c.AssertNoChange()
// Watch from the second requirer's perspective, and check it only sees the
// second provider.
lgw1 := lgru1.Watch()
defer testing.AssertStop(c, lgw1)
lgw1c := testing.NewRelationUnitsWatcherC(c, s.State, lgw1)
expectChanged = []string{"mysql/1"}
lgw1c.AssertChange(expectChanged, nil)
lgw1c.AssertNoChange()
// Join the second requirer, and check that the first provider observes it...
err = lgru1.EnterScope(nil)
c.Assert(err, gc.IsNil)
expectChanged = []string{"logging/1"}
msw1c.AssertChange(expectChanged, nil)
msw1c.AssertNoChange()
// ...and that nothing else sees anything.
msw0c.AssertNoChange()
lgw0c.AssertNoChange()
lgw1c.AssertNoChange()
// Change the second provider's settings and check that the second
// requirer notices...
changeSettings(c, msru1)
expectChanged = []string{"mysql/1"}
lgw1c.AssertChange(expectChanged, nil)
lgw1c.AssertNoChange()
// ...but that nothing else does.
msw0c.AssertNoChange()
msw1c.AssertNoChange()
msw0c.AssertNoChange()
// Finally, depart the first provider, and check that only the first
// requirer observes any change.
err = msru0.LeaveScope()
c.Assert(err, gc.IsNil)
expectDeparted := []string{"mysql/0"}
lgw0c.AssertChange(nil, expectDeparted)
lgw0c.AssertNoChange()
lgw1c.AssertNoChange()
msw0c.AssertNoChange()
msw1c.AssertNoChange()
// Again, I think we're done, and can be comfortable that the appropriate
// connections are in place.
}