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},
})
}
func TestReconnect(t *testing.T) {
discoverdPort, err := etcdrunner.RandomPort()
if err != nil {
t.Fatal(err)
}
clientA, etcdAddr, cleanup := testutil.SetupDiscoverdWithEtcd(t)
defer cleanup()
clientB, killDiscoverd := testutil.BootDiscoverd(t, discoverdPort, etcdAddr)
defer func() {
clientB.UnregisterAll()
clientB.Close()
killDiscoverd()
}()
service1 := "serviceReconnect-1"
service2 := "serviceReconnect-2"
assert(clientA.Register(service1, ":1111"), t)
assert(clientA.Register(service1, ":2222"), t)
assert(clientA.Register(service2, ":1111"), t)
assert(clientA.Register(service2, ":2222"), t)
set1, err := clientB.NewServiceSet(service1)
assert(err, t)
waitUpdates(t, set1, true, 2)()
set2, err := clientB.NewServiceSet(service2)
assert(err, t)
waitUpdates(t, set2, true, 2)()
updates1 := set1.Watch(false)
updates2 := set2.Watch(false)
reconnCh := clientB.WatchReconnects()
defer clientB.UnwatchReconnects(reconnCh)
killDiscoverd()
waitForConnStatus(t, reconnCh, discoverd.ConnStatusDisconnected)
if err := clientB.Register(service1, ":3333"); err != discoverd.ErrDisconnected {
t.Fatal("expected ErrDisconnected from clientB, got:", err)
}
if _, err := clientB.Services(service2, 1); err != discoverd.ErrDisconnected {
t.Fatal("expected ErrDisconnected from clientB, got:", err)
}
assert(clientA.RegisterWithAttributes(service1, ":1111", map[string]string{"foo": "bar"}), t)
assert(clientA.Unregister(service1, ":2222"), t)
assert(clientA.Unregister(service2, ":1111"), t)
assert(clientA.Register(service2, ":3333"), t)
_, killDiscoverd = testutil.RunDiscoverdServer(t, discoverdPort, etcdAddr)
waitForConnStatus(t, reconnCh, discoverd.ConnStatusConnected)
// use goroutines to check for updates so slow watchers don't block the rpc stream
updateErrors := make(chan error)
go func() {
updateErrors <- checkUpdates(updates1, []*agent.ServiceUpdate{
{
Name: service1,
Addr: "127.0.0.1:1111",
Online: true,
Attrs: map[string]string{"foo": "bar"},
},
{
Name: service1,
Addr: "127.0.0.1:2222",
Online: false,
},
})
}()
go func() {
updateErrors <- checkUpdates(updates2, []*agent.ServiceUpdate{
{
Name: service2,
Addr: "127.0.0.1:3333",
Online: true,
},
{
Name: service2,
Addr: "127.0.0.1:2222",
Online: true,
},
{
Name: service2,
Addr: "127.0.0.1:1111",
Online: false,
},
})
}()
var updateError error
for i := 0; i < 2; i++ {
if err := <-updateErrors; err != nil && updateError == nil {
updateError = err
}
}
if updateError != nil {
t.Fatal(updateError)
}
assert(clientA.Register(service1, ":3333"), t)
if err := checkUpdates(updates1, []*agent.ServiceUpdate{{
Name: service1,
Addr: "127.0.0.1:3333",
Online: true,
}}); err != nil {
t.Fatal(err)
}
// wait for one heartbeat
time.Sleep(agent.HeartbeatIntervalSecs*time.Second + time.Second)
checkServices(t, set1.Services(), []*discoverd.Service{
{Name: service1, Host: "127.0.0.1", Port: "1111", Addr: "127.0.0.1:1111", Attrs: map[string]string{"foo": "bar"}},
{Name: service1, Host: "127.0.0.1", Port: "3333", Addr: "127.0.0.1:3333"},
})
checkServices(t, set2.Services(), []*discoverd.Service{
{Name: service2, Host: "127.0.0.1", Port: "2222", Addr: "127.0.0.1:2222"},
{Name: service2, Host: "127.0.0.1", Port: "3333", Addr: "127.0.0.1:3333"},
})
}