func (s *S) TestRetryChangeSetting(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "old", gozk.EPHEMERAL,
gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
err = zk.RetryChange("/test", gozk.EPHEMERAL, []gozk.ACL{},
func(data string, stat gozk.Stat) (string, error) {
c.Assert(data, Equals, "old")
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(0))
return "brand new", nil
})
c.Assert(err, IsNil)
data, stat, err := zk.Get("/test")
c.Assert(err, IsNil)
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(1))
c.Assert(data, Equals, "brand new")
// ACL was unchanged by RetryChange().
acl, _, err := zk.ACL("/test")
c.Assert(err, IsNil)
c.Assert(acl, Equals, gozk.WorldACL(gozk.PERM_ALL))
}
func (s *S) TestRetryChangeConflictOnCreate(c *C) {
zk, _ := s.init(c)
changeFunc := func(data string, stat gozk.Stat) (string, error) {
switch data {
case "":
c.Assert(stat, IsNil)
_, err := zk.Create("/test", "conflict", gozk.EPHEMERAL,
gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
return "<none> => conflict", nil
case "conflict":
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(0))
return "conflict => new", nil
default:
c.Fatal("Unexpected node data: " + data)
}
return "can't happen", nil
}
err := zk.RetryChange("/test", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL),
changeFunc)
c.Assert(err, IsNil)
data, stat, err := zk.Get("/test")
c.Assert(err, IsNil)
c.Assert(data, Equals, "conflict => new")
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(1))
}
func (s *S) TestChildrenAndWatch(c *C) {
c.Check(gozk.CountPendingWatches(), Equals, 0)
zk, _ := s.init(c)
c.Check(gozk.CountPendingWatches(), Equals, 1)
children, stat, watch, err := zk.ChildrenW("/")
c.Assert(err, IsNil)
c.Assert(children, Equals, []string{"zookeeper"})
c.Assert(stat.NumChildren(), Equals, int32(1))
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
c.Check(gozk.CountPendingWatches(), Equals, 2)
_, err = zk.Create("/test1", "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
event := <-watch
c.Assert(event.Type, Equals, gozk.EVENT_CHILD)
c.Assert(event.Path, Equals, "/")
c.Check(gozk.CountPendingWatches(), Equals, 1)
children, stat, watch, err = zk.ChildrenW("/")
c.Assert(err, IsNil)
c.Assert(stat.NumChildren(), Equals, int32(2))
// The ordering is most likely unstable, so this test must be fixed.
c.Assert(children, Equals, []string{"test1", "zookeeper"})
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
c.Check(gozk.CountPendingWatches(), Equals, 2)
_, err = zk.Create("/test2", "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
event = <-watch
c.Assert(event.Type, Equals, gozk.EVENT_CHILD)
c.Check(gozk.CountPendingWatches(), Equals, 1)
}
func (s *S) TestCreateAndGet(c *C) {
zk, _ := s.init(c)
path, err := zk.Create("/test-", "bababum", gozk.SEQUENCE|gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
c.Assert(path, Matches, "/test-[0-9]+")
// Check the error condition from Create().
_, err = zk.Create(path, "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, Matches, "node exists")
data, _, err := zk.Get(path)
c.Assert(err, IsNil)
c.Assert(data, Equals, "bababum")
}
func (s *S) TestExistsAndWatch(c *C) {
c.Check(gozk.CountPendingWatches(), Equals, 0)
zk, _ := s.init(c)
c.Check(gozk.CountPendingWatches(), Equals, 1)
stat, watch, err := zk.ExistsW("/test")
c.Assert(err, IsNil)
c.Assert(stat, IsNil)
c.Check(gozk.CountPendingWatches(), Equals, 2)
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
_, err = zk.Create("/test", "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
event := <-watch
c.Assert(event.Type, Equals, gozk.EVENT_CREATED)
c.Assert(event.Path, Equals, "/test")
c.Check(gozk.CountPendingWatches(), Equals, 1)
stat, watch, err = zk.ExistsW("/test")
c.Assert(err, IsNil)
c.Assert(stat, NotNil)
c.Assert(stat.NumChildren(), Equals, int32(0))
c.Check(gozk.CountPendingWatches(), Equals, 2)
}
func (s *S) TestSetACL(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
err = zk.SetACL("/test", gozk.WorldACL(gozk.PERM_ALL), 5)
c.Assert(err, NotNil)
c.Assert(err.Code(), Equals, gozk.ZBADVERSION)
err = zk.SetACL("/test", gozk.WorldACL(gozk.PERM_READ), -1)
c.Assert(err, IsNil)
acl, _, err := zk.ACL("/test")
c.Assert(err, IsNil)
c.Assert(acl, Equals, gozk.WorldACL(gozk.PERM_READ))
}
func (s *S) TestACL(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
acl, stat, err := zk.ACL("/test")
c.Assert(err, IsNil)
c.Assert(acl, Equals, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(0))
acl, stat, err = zk.ACL("/non-existent")
c.Assert(err, NotNil)
c.Assert(err.Code(), Equals, gozk.ZNONODE)
c.Assert(acl, IsNil)
c.Assert(stat, IsNil)
}
func (s *S) TestRetryChangeCreating(c *C) {
zk, _ := s.init(c)
err := zk.RetryChange("/test", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL),
func(data string, stat gozk.Stat) (string, error) {
c.Assert(data, Equals, "")
c.Assert(stat, IsNil)
return "new", nil
})
c.Assert(err, IsNil)
data, stat, err := zk.Get("/test")
c.Assert(err, IsNil)
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(0))
c.Assert(data, Equals, "new")
acl, _, err := zk.ACL("/test")
c.Assert(err, IsNil)
c.Assert(acl, Equals, gozk.WorldACL(gozk.PERM_ALL))
}
func (s *S) TestWatchOnReconnection(c *C) {
c.Check(gozk.CountPendingWatches(), Equals, 0)
zk, session := s.init(c)
event := <-session
c.Assert(event.Type, Equals, gozk.EVENT_SESSION)
c.Assert(event.State, Equals, gozk.STATE_CONNECTED)
c.Check(gozk.CountPendingWatches(), Equals, 1)
stat, watch, err := zk.ExistsW("/test")
c.Assert(err, IsNil)
c.Assert(stat, IsNil)
c.Check(gozk.CountPendingWatches(), Equals, 2)
s.StopZK()
time.Sleep(2e9)
s.StartZK()
// The session channel should receive the reconnection notification,
select {
case event := <-session:
c.Assert(event.State, Equals, gozk.STATE_CONNECTING)
case <-time.After(3e9):
c.Fatal("Session watch didn't fire")
}
select {
case event := <-session:
c.Assert(event.State, Equals, gozk.STATE_CONNECTED)
case <-time.After(3e9):
c.Fatal("Session watch didn't fire")
}
// The watch channel should not, since it's not affected.
select {
case event := <-watch:
c.Fatalf("Exists watch fired: %s", event)
default:
}
// And it should still work.
_, err = zk.Create("/test", "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
event = <-watch
c.Assert(event.Type, Equals, gozk.EVENT_CREATED)
c.Assert(event.Path, Equals, "/test")
c.Check(gozk.CountPendingWatches(), Equals, 1)
}
func (s *S) TestRetryChangeConflictOnSetDueToDelete(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "old", gozk.EPHEMERAL,
gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
changeFunc := func(data string, stat gozk.Stat) (string, error) {
switch data {
case "old":
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(0))
err := zk.Delete("/test", 0)
c.Assert(err, IsNil)
return "old => <deleted>", nil
case "":
c.Assert(stat, IsNil)
return "<deleted> => new", nil
default:
c.Fatal("Unexpected node data: " + data)
}
return "can't happen", nil
}
err = zk.RetryChange("/test", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_READ),
changeFunc)
c.Assert(err, IsNil)
data, stat, err := zk.Get("/test")
c.Assert(err, IsNil)
c.Assert(data, Equals, "<deleted> => new")
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(0))
// Should be the new ACL.
acl, _, err := zk.ACL("/test")
c.Assert(err, IsNil)
c.Assert(acl, Equals, gozk.WorldACL(gozk.PERM_READ))
}
func (s *S) TestGetAndWatch(c *C) {
c.Check(gozk.CountPendingWatches(), Equals, 0)
zk, _ := s.init(c)
c.Check(gozk.CountPendingWatches(), Equals, 1)
_, err := zk.Create("/test", "one", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
data, stat, watch, err := zk.GetW("/test")
c.Assert(err, IsNil)
c.Assert(data, Equals, "one")
c.Assert(stat.Version(), Equals, int32(0))
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
c.Check(gozk.CountPendingWatches(), Equals, 2)
_, err = zk.Set("/test", "two", -1)
c.Assert(err, IsNil)
event := <-watch
c.Assert(event.Type, Equals, gozk.EVENT_CHANGED)
c.Check(gozk.CountPendingWatches(), Equals, 1)
data, _, watch, err = zk.GetW("/test")
c.Assert(err, IsNil)
c.Assert(data, Equals, "two")
select {
case <-watch:
c.Fatal("Watch fired")
default:
}
c.Check(gozk.CountPendingWatches(), Equals, 2)
_, err = zk.Set("/test", "three", -1)
c.Assert(err, IsNil)
event = <-watch
c.Assert(event.Type, Equals, gozk.EVENT_CHANGED)
c.Check(gozk.CountPendingWatches(), Equals, 1)
}
func (s *S) TestRetryChangeFailsCreating(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "old", gozk.EPHEMERAL,
gozk.WorldACL(gozk.PERM_READ)) // Read only!
c.Assert(err, IsNil)
var called bool
err = zk.RetryChange("/test/sub", gozk.EPHEMERAL,
gozk.WorldACL(gozk.PERM_ALL),
func(data string, stat gozk.Stat) (string, error) {
called = true
return "", nil
})
c.Assert(err, NotNil)
c.Assert(err.Code(), Equals, gozk.ZNOAUTH)
stat, err := zk.Exists("/test/sub")
c.Assert(err, IsNil)
c.Assert(stat, IsNil)
c.Assert(called, Equals, true)
}
func (s *S) TestRetryChangeFailsReading(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "old", gozk.EPHEMERAL,
gozk.WorldACL(gozk.PERM_WRITE)) // Write only!
c.Assert(err, IsNil)
var called bool
err = zk.RetryChange("/test", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL),
func(data string, stat gozk.Stat) (string, error) {
called = true
return "", nil
})
c.Assert(err, NotNil)
c.Assert(err.Code(), Equals, gozk.ZNOAUTH)
stat, err := zk.Exists("/test")
c.Assert(err, IsNil)
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(0))
c.Assert(called, Equals, false)
}
func (s *S) TestCreateSetAndGet(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
stat, err := zk.Set("/test", "bababum", -1) // Any version.
c.Assert(err, IsNil)
c.Assert(stat.Version(), Equals, int32(1))
data, _, err := zk.Get("/test")
c.Assert(err, IsNil)
c.Assert(data, Equals, "bababum")
}
func (s *S) TestRetryChangeErrorInCallback(c *C) {
zk, _ := s.init(c)
err := zk.RetryChange("/test", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL),
func(data string, stat gozk.Stat) (string, error) {
return "don't use this", errors.New("BOOM!")
})
c.Assert(err, NotNil)
c.Assert(err.Code(), Equals, gozk.ZSYSTEMERROR)
c.Assert(err.Error(), Equals, "BOOM!")
stat, err := zk.Exists("/test")
c.Assert(err, IsNil)
c.Assert(stat, IsNil)
}
// Surprisingly for some (including myself, initially), the watch
// returned by the exists method actually fires on data changes too.
func (s *S) TestExistsWatchOnDataChange(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
_, watch, err := zk.ExistsW("/test")
c.Assert(err, IsNil)
_, err = zk.Set("/test", "new", -1)
c.Assert(err, IsNil)
event := <-watch
c.Assert(event.Path, Equals, "/test")
c.Assert(event.Type, Equals, gozk.EVENT_CHANGED)
}
func (s *S) TestDelete(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
err = zk.Delete("/test", 5)
c.Assert(err, NotNil)
c.Assert(err.Code(), Equals, gozk.ZBADVERSION)
err = zk.Delete("/test", -1)
c.Assert(err, IsNil)
err = zk.Delete("/test", -1)
c.Assert(err, NotNil)
c.Assert(err.Code(), Equals, gozk.ZNONODE)
}
func (s *S) TestCloseReleasesWatches(c *C) {
c.Check(gozk.CountPendingWatches(), Equals, 0)
zk, _ := s.init(c)
c.Check(gozk.CountPendingWatches(), Equals, 1)
_, err := zk.Create("/test", "one", gozk.EPHEMERAL, gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
_, _, _, err = zk.GetW("/test")
c.Assert(err, IsNil)
c.Assert(gozk.CountPendingWatches(), Equals, 2)
zk.Close()
c.Assert(gozk.CountPendingWatches(), Equals, 0)
}
func (s *S) TestRetryChangeUnchangedValueDoesNothing(c *C) {
zk, _ := s.init(c)
_, err := zk.Create("/test", "old", gozk.EPHEMERAL,
gozk.WorldACL(gozk.PERM_ALL))
c.Assert(err, IsNil)
err = zk.RetryChange("/test", gozk.EPHEMERAL, []gozk.ACL{},
func(data string, stat gozk.Stat) (string, error) {
c.Assert(data, Equals, "old")
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(0))
return "old", nil
})
c.Assert(err, IsNil)
data, stat, err := zk.Get("/test")
c.Assert(err, IsNil)
c.Assert(stat, NotNil)
c.Assert(stat.Version(), Equals, int32(0)) // Unchanged!
c.Assert(data, Equals, "old")
}