func newTest(t *testing.T) (s *test) {
defer func() {
if t.Failed() {
s.cleanup()
t.FailNow()
}
}()
etcdAddr, killEtcd := etcdrunner.RunEtcdServer(t)
client, killDiscoverd := testutil.BootDiscoverd(t, "", etcdAddr)
serviceName := "flannel-test"
if err := client.AddService(serviceName, nil); err != nil {
t.Errorf("error adding service: %s", err)
}
service := client.Service(serviceName)
events := make(chan *discoverd.Event)
stream, err := service.Watch(events)
if err != nil {
t.Errorf("error creating watch: %s", err)
}
data := []byte(`{"config":{"network": "10.3.0.0/16"}}`)
if err := service.SetMeta(&discoverd.ServiceMeta{Data: data}); err != nil {
t.Errorf("error setting meta: %s", err)
}
registry, err := NewRegistry(client, serviceName)
if err != nil {
t.Errorf("error creating registry: %s", err)
}
return &test{
T: t,
client: client,
service: service,
events: events,
registry: registry,
cleanup: func() {
stream.Close()
killDiscoverd()
killEtcd()
},
}
}
func (s *ClientSuite) TestWatchReconnect(c *C) {
port, err := etcdrunner.RandomPort()
c.Assert(err, IsNil)
// clientA is used to register services and instances, and remains connected
clientA, etcdAddr, cleanup := testutil.SetupDiscoverdWithEtcd(c)
defer cleanup()
// clientB is connected to the server which will be restarted, and is used to
// test that the watch generates the correct events after reconnecting
clientB, killDiscoverd := testutil.BootDiscoverd(c, port, etcdAddr)
defer func() { killDiscoverd() }()
// create a service with manual leader and some metadata
service := "foo"
config := &discoverd.ServiceConfig{LeaderType: discoverd.LeaderTypeManual}
c.Assert(clientA.AddService(service, config), IsNil)
serviceMeta := &discoverd.ServiceMeta{Data: []byte(`{"foo": "bar"}`)}
c.Assert(clientA.Service(service).SetMeta(serviceMeta), IsNil)
register := func(client *discoverd.Client, addr string, meta map[string]string) (discoverd.Heartbeater, *discoverd.Instance) {
inst := &discoverd.Instance{Addr: addr, Proto: "tcp", Meta: meta}
hb, err := client.RegisterInstance(service, inst)
c.Assert(err, IsNil)
return hb, inst
}
waitForEvent := func(events chan *discoverd.Event, addr string, kind discoverd.EventKind) {
for {
select {
case e := <-events:
if e.Kind == kind && (addr == "" || addr == e.Instance.Addr) {
return
}
case <-time.After(10 * time.Second):
c.Fatalf("timed out wating for %s event", kind)
}
}
}
waitForWatchState := func(ch chan discoverd.WatchState, state discoverd.WatchState) {
for {
select {
case s := <-ch:
if s == state {
return
}
case <-time.After(10 * time.Second):
c.Fatalf("timed out waiting for watch %s state", state)
}
}
}
// register three services
register(clientA, ":1111", nil)
hb2, _ := register(clientA, ":2222", map[string]string{"foo": "bar"})
hb3, _ := register(clientA, ":3333", nil)
// create watches using both clients so we can synchronize assertions
eventsA := make(chan *discoverd.Event)
watchA, err := clientA.Service(service).Watch(eventsA)
c.Assert(err, IsNil)
defer watchA.Close()
waitForEvent(eventsA, "", discoverd.EventKindCurrent)
eventsB := make(chan *discoverd.Event)
watchB, err := clientB.Service(service).Watch(eventsB)
c.Assert(err, IsNil)
defer watchB.Close()
waitForEvent(eventsB, "", discoverd.EventKindCurrent)
// kill clientB's server and wait for the watch to disconnect
stateCh := make(chan discoverd.WatchState)
watchB.(*discoverd.Watch).SetStateChannel(stateCh)
killDiscoverd()
waitForWatchState(stateCh, discoverd.WatchStateDisconnected)
// make some changes using clientA
// change some metadata
c.Assert(hb2.SetMeta(map[string]string{"foo": "baz"}), IsNil)
waitForEvent(eventsA, ":2222", discoverd.EventKindUpdate)
// register a new instance
_, inst := register(clientA, ":4444", nil)
waitForEvent(eventsA, ":4444", discoverd.EventKindUp)
// set a new leader
clientA.Service(service).SetLeader(inst.ID)
waitForEvent(eventsA, ":4444", discoverd.EventKindLeader)
// unregister an instance
hb3.Close()
waitForEvent(eventsA, ":3333", discoverd.EventKindDown)
// update the service metadata
serviceMeta.Data = []byte(`{"foo": "baz"}`)
c.Assert(clientA.Service(service).SetMeta(serviceMeta), IsNil)
waitForEvent(eventsA, "", discoverd.EventKindServiceMeta)
// restart clientB's server and wait for the watch to reconnect
_, killDiscoverd = testutil.RunDiscoverdServer(c, port, etcdAddr)
waitForWatchState(stateCh, discoverd.WatchStateConnected)
type expectedEvent struct {
Addr string
Kind discoverd.EventKind
ServiceMeta *discoverd.ServiceMeta
}
assertCurrent := func(events chan *discoverd.Event, expected []*expectedEvent) {
count := 0
isExpected := func(event *discoverd.Event) bool {
for _, e := range expected {
if e.Kind != event.Kind {
continue
}
switch event.Kind {
case discoverd.EventKindServiceMeta:
if reflect.DeepEqual(event.ServiceMeta, e.ServiceMeta) {
return true
}
default:
if event.Instance != nil && event.Instance.Addr == e.Addr {
return true
}
}
}
return false
}
for {
select {
case event := <-events:
if event.Kind == discoverd.EventKindCurrent {
if count != len(expected) {
c.Fatalf("expected %d events, got %d", len(expected), count)
}
return
}
if !isExpected(event) {
c.Fatalf("unexpected event: %+v", event)
}
count++
case <-time.After(10 * time.Second):
c.Fatal("timed out waiting for events")
}
}
}
// check watchB emits missed events
assertCurrent(eventsB, []*expectedEvent{
{Addr: ":2222", Kind: discoverd.EventKindUpdate},
{Addr: ":4444", Kind: discoverd.EventKindUp},
{Addr: ":4444", Kind: discoverd.EventKindLeader},
{Kind: discoverd.EventKindServiceMeta, ServiceMeta: serviceMeta},
{Addr: ":3333", Kind: discoverd.EventKindDown},
})
}