func (s *S) TestExistsAndWatch(c *C) {
c.Check(zk.CountPendingWatches(), Equals, 0)
conn, _ := s.init(c)
c.Check(zk.CountPendingWatches(), Equals, 1)
stat, watch, err := conn.ExistsW("/test")
c.Assert(err, IsNil)
c.Assert(stat, IsNil)
c.Check(zk.CountPendingWatches(), Equals, 2)
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
_, err = conn.Create("/test", "", zk.EPHEMERAL, zk.WorldACL(zk.PERM_ALL))
c.Assert(err, IsNil)
event := <-watch
c.Assert(event.Type, Equals, zk.EVENT_CREATED)
c.Assert(event.Path, Equals, "/test")
c.Check(zk.CountPendingWatches(), Equals, 1)
stat, watch, err = conn.ExistsW("/test")
c.Assert(err, IsNil)
c.Assert(stat, NotNil)
c.Assert(stat.NumChildren(), Equals, 0)
c.Check(zk.CountPendingWatches(), Equals, 2)
}
func (s *S) TestCloseReleasesWatches(c *C) {
c.Check(zk.CountPendingWatches(), Equals, 0)
conn, _ := s.init(c)
c.Check(zk.CountPendingWatches(), Equals, 1)
_, err := conn.Create("/test", "one", zk.EPHEMERAL, zk.WorldACL(zk.PERM_ALL))
c.Assert(err, IsNil)
_, _, watch, err := conn.GetW("/test")
c.Assert(err, IsNil)
c.Assert(zk.CountPendingWatches(), Equals, 2)
conn.Close()
c.Assert(zk.CountPendingWatches(), Equals, 0)
select {
case _, ok := <-watch:
c.Assert(ok, Equals, false)
case <-time.After(3e9):
c.Fatal("Watch didn't fire")
}
}
func (s *S) TestWatchOnReconnection(c *C) {
c.Check(zk.CountPendingWatches(), Equals, 0)
conn, session := s.init(c)
event := <-session
c.Assert(event.Type, Equals, zk.EVENT_SESSION)
c.Assert(event.State, Equals, zk.STATE_CONNECTED)
c.Check(zk.CountPendingWatches(), Equals, 1)
stat, watch, err := conn.ExistsW("/test")
c.Assert(err, IsNil)
c.Assert(stat, IsNil)
c.Check(zk.CountPendingWatches(), Equals, 2)
s.zkServer.Stop()
time.Sleep(2e9)
s.zkServer.Start()
// The session channel should receive the reconnection notification.
select {
case event := <-session:
c.Assert(event.State, Equals, zk.STATE_CONNECTING)
case <-time.After(3e9):
c.Fatal("Session watch didn't fire")
}
select {
case event := <-session:
c.Assert(event.State, Equals, zk.STATE_CONNECTED)
case <-time.After(3e9):
c.Fatal("Session watch didn't fire")
}
// The watch channel should receive just the connecting notification.
select {
case event := <-watch:
c.Assert(event.State, Equals, zk.STATE_CONNECTING)
case <-time.After(3e9):
c.Fatal("Watch didn't fire")
}
select {
case _, ok := <-watch:
c.Assert(ok, Equals, false)
case <-time.After(3e9):
c.Fatal("Watch wasn't closed")
}
c.Check(zk.CountPendingWatches(), Equals, 1)
}
func (s *S) TestSessionWatches(c *C) {
c.Assert(zk.CountPendingWatches(), Equals, 0)
zk1, watch1 := s.init(c)
zk2, watch2 := s.init(c)
zk3, watch3 := s.init(c)
c.Assert(zk.CountPendingWatches(), Equals, 3)
event1 := <-watch1
c.Assert(event1.Type, Equals, zk.EVENT_SESSION)
c.Assert(event1.State, Equals, zk.STATE_CONNECTED)
c.Assert(zk.CountPendingWatches(), Equals, 3)
event2 := <-watch2
c.Assert(event2.Type, Equals, zk.EVENT_SESSION)
c.Assert(event2.State, Equals, zk.STATE_CONNECTED)
c.Assert(zk.CountPendingWatches(), Equals, 3)
event3 := <-watch3
c.Assert(event3.Type, Equals, zk.EVENT_SESSION)
c.Assert(event3.State, Equals, zk.STATE_CONNECTED)
c.Assert(zk.CountPendingWatches(), Equals, 3)
zk1.Close()
c.Assert(zk.CountPendingWatches(), Equals, 2)
zk2.Close()
c.Assert(zk.CountPendingWatches(), Equals, 1)
zk3.Close()
c.Assert(zk.CountPendingWatches(), Equals, 0)
}
func (s *S) TestWatchOnSessionExpiration(c *C) {
c.Check(zk.CountPendingWatches(), Equals, 0)
conn, session := s.init(c)
event := <-session
c.Assert(event.Type, Equals, zk.EVENT_SESSION)
c.Assert(event.State, Equals, zk.STATE_CONNECTED)
c.Check(zk.CountPendingWatches(), Equals, 1)
stat, watch, err := conn.ExistsW("/test")
c.Assert(err, IsNil)
c.Assert(stat, IsNil)
c.Check(zk.CountPendingWatches(), Equals, 2)
// Use expiration trick described in the FAQ.
clientId := conn.ClientId()
zk2, session2, err := zk.Redial(s.zkAddr, 5e9, clientId)
for event := range session2 {
c.Log("Event from overlapping session: ", event)
if event.State == zk.STATE_CONNECTED {
// Wait for zk to process the connection.
// Not reliable without this. :-(
time.Sleep(1e9)
zk2.Close()
}
}
for event := range session {
c.Log("Event from primary session: ", event)
if event.State == zk.STATE_EXPIRED_SESSION {
break
}
}
select {
case event := <-watch:
c.Assert(event.State, Equals, zk.STATE_CONNECTING)
case <-time.After(3e9):
c.Fatal("Watch event didn't fire")
}
event = <-watch
c.Assert(event.Type, Equals, zk.EVENT_CLOSED)
c.Assert(event.State, Equals, zk.STATE_CLOSED)
c.Check(zk.CountPendingWatches(), Equals, 1)
}
func (s *S) TestGetAndWatchWithError(c *C) {
c.Check(zk.CountPendingWatches(), Equals, 0)
conn, _ := s.init(c)
c.Check(zk.CountPendingWatches(), Equals, 1)
_, _, watch, err := conn.GetW("/test")
c.Assert(err, NotNil)
c.Check(zk.IsError(err, zk.ZNONODE), Equals, true, Commentf("%v", err))
c.Assert(watch, IsNil)
c.Check(zk.CountPendingWatches(), Equals, 1)
}
func (s *S) TestExistsAndWatchWithError(c *C) {
c.Check(zk.CountPendingWatches(), Equals, 0)
conn, _ := s.init(c)
c.Check(zk.CountPendingWatches(), Equals, 1)
stat, watch, err := conn.ExistsW("///")
c.Assert(err, NotNil)
c.Check(zk.IsError(err, zk.ZBADARGUMENTS), Equals, true, Commentf("%v", err))
c.Assert(stat, IsNil)
c.Assert(watch, IsNil)
c.Check(zk.CountPendingWatches(), Equals, 1)
}
func (s *S) TestChildrenAndWatch(c *C) {
c.Check(zk.CountPendingWatches(), Equals, 0)
conn, _ := s.init(c)
c.Check(zk.CountPendingWatches(), Equals, 1)
children, stat, watch, err := conn.ChildrenW("/")
c.Assert(err, IsNil)
c.Assert(children, DeepEquals, []string{"zookeeper"})
c.Assert(stat.NumChildren(), Equals, 1)
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
c.Check(zk.CountPendingWatches(), Equals, 2)
_, err = conn.Create("/test1", "", zk.EPHEMERAL, zk.WorldACL(zk.PERM_ALL))
c.Assert(err, IsNil)
event := <-watch
c.Assert(event.Type, Equals, zk.EVENT_CHILD)
c.Assert(event.Path, Equals, "/")
c.Check(zk.CountPendingWatches(), Equals, 1)
children, stat, watch, err = conn.ChildrenW("/")
c.Assert(err, IsNil)
c.Assert(stat.NumChildren(), Equals, 2)
// The ordering is most likely unstable, so this test must be fixed.
c.Assert(children, DeepEquals, []string{"test1", "zookeeper"})
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
c.Check(zk.CountPendingWatches(), Equals, 2)
_, err = conn.Create("/test2", "", zk.EPHEMERAL, zk.WorldACL(zk.PERM_ALL))
c.Assert(err, IsNil)
event = <-watch
c.Assert(event.Type, Equals, zk.EVENT_CHILD)
c.Check(zk.CountPendingWatches(), Equals, 1)
}
func (s *S) TestGetAndWatch(c *C) {
c.Check(zk.CountPendingWatches(), Equals, 0)
conn, _ := s.init(c)
c.Check(zk.CountPendingWatches(), Equals, 1)
_, err := conn.Create("/test", "one", zk.EPHEMERAL, zk.WorldACL(zk.PERM_ALL))
c.Assert(err, IsNil)
data, stat, watch, err := conn.GetW("/test")
c.Assert(err, IsNil)
c.Assert(data, Equals, "one")
c.Assert(stat.Version(), Equals, 0)
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
c.Check(zk.CountPendingWatches(), Equals, 2)
_, err = conn.Set("/test", "two", -1)
c.Assert(err, IsNil)
event := <-watch
c.Assert(event.Type, Equals, zk.EVENT_CHANGED)
c.Check(zk.CountPendingWatches(), Equals, 1)
data, _, watch, err = conn.GetW("/test")
c.Assert(err, IsNil)
c.Assert(data, Equals, "two")
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
c.Check(zk.CountPendingWatches(), Equals, 2)
_, err = conn.Set("/test", "three", -1)
c.Assert(err, IsNil)
event = <-watch
c.Assert(event.Type, Equals, zk.EVENT_CHANGED)
c.Check(zk.CountPendingWatches(), Equals, 1)
}
func (s *S) TearDownTest(c *C) {
// Close all handles opened in s.init().
for _, handle := range s.handles {
handle.Close()
}
// Wait for all the goroutines created in s.init() to terminate.
for s.liveWatches > 0 {
select {
case <-s.deadWatches:
s.liveWatches -= 1
case <-time.After(5e9):
panic("There's a locked watch goroutine :-(")
}
}
// Reset the list of handles.
s.handles = make([]*zk.Conn, 0)
c.Assert(zk.CountPendingWatches(), Equals, 0,
Commentf("Test left live watches behind!"))
}
func (s *S) SetUpTest(c *C) {
c.Assert(zk.CountPendingWatches(), Equals, 0,
Commentf("Test got a dirty watch state before running!"))
zk.SetLogLevel(logLevel)
}