def exists(self, path, watcher=None):
"""Return the state of the node of the given path.
If the watcher is not None and the call is successful (no exception is
thrown), a watch will be left on the node with the given path. The
watch will be triggered by a successful operation that creates/delete
the node or sets the data on the node.
:Parameters:
- `path`: node path
- `watcher`: (optional) watcher function
:Returns:
Stat object of the node of the given path; returns None if no such
node exists.
:Exceptions:
TODO
"""
if watcher:
stat = _zookeeper.exists(self.zk_handle, path,
self._wrap_watcher(watcher))
else:
stat = _zookeeper.exists(self.zk_handle, path)
if stat is not None:
return Stat(**stat)
else:
return None
def set_watcher():
def fn(): self.callback_flag = True
self.callback_flag = False
zookeeper.exists(self.handle, "/zk-python-lose-scope-test",
self.create_callback( lambda handle, type, state, path: fn() )
)
def test_sync_nexists(self):
self.assertEqual(None, zookeeper.exists(self.handle, "/i-dont-exist", None))
def test_sync_exists(self):
self.assertEqual(self.connected, True)
ret = zookeeper.exists(self.handle, "/zk-python-existstest", None)
self.assertNotEqual(ret, None, "/zk-python-existstest does not exist (possibly means creation failure)")