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import uuid
from mock import patch, call, Mock
from nose.tools import eq_, ok_, assert_not_equal, raises
from kazoo.testing import KazooTestCase
from kazoo.exceptions import KazooException
from kazoo.recipe.cache import TreeCache, TreeNode, TreeEvent
class KazooTreeCacheTests(KazooTestCase):
def setUp(self):
super(KazooTreeCacheTests, self).setUp()
self._event_queue = self.client.handler.queue_impl()
self._error_queue = self.client.handler.queue_impl()
self.path = None
self.cache = None
def tearDown(self):
super(KazooTreeCacheTests, self).tearDown()
if not self._error_queue.empty():
try:
raise self._error_queue.get()
except FakeException:
pass
def make_cache(self):
if self.cache is None:
self.path = '/' + uuid.uuid4().hex
self.cache = TreeCache(self.client, self.path)
self.cache.listen(lambda event: self._event_queue.put(event))
self.cache.listen_fault(lambda error: self._error_queue.put(error))
self.cache.start()
return self.cache
def wait_cache(self, expect=None, since=None, timeout=10):
started = since is None
while True:
event = self._event_queue.get(timeout=timeout)
if started:
if expect is not None:
eq_(event.event_type, expect)
return event
if event.event_type == since:
started = True
if expect is None:
return
def spy_client(self, method_name):
method = getattr(self.client, method_name)
return patch.object(self.client, method_name, wraps=method)
def test_start(self):
self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
stat = self.client.exists(self.path)
eq_(stat.version, 0)
eq_(self.cache._state, TreeCache.STATE_STARTED)
eq_(self.cache._root._state, TreeNode.STATE_LIVE)
@raises(KazooException)
def test_start_started(self):
self.make_cache()
self.cache.start()
@raises(KazooException)
def test_start_closed(self):
self.make_cache()
self.cache.start()
self.cache.close()
self.cache.start()
def test_close(self):
self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
self.client.create(self.path + '/foo/bar/baz', makepath=True)
for _ in range(3):
self.wait_cache(TreeEvent.NODE_ADDED)
self.cache.close()
# nothing should be published since tree closed
ok_(self._event_queue.empty())
# tree should be empty
eq_(self.cache._root._children, {})
eq_(self.cache._root._data, None)
eq_(self.cache._state, TreeCache.STATE_CLOSED)
# node state should not be changed
assert_not_equal(self.cache._root._state, TreeNode.STATE_DEAD)
def test_children_operation(self):
self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
self.client.create(self.path + '/test_children', b'test_children_1')
event = self.wait_cache(TreeEvent.NODE_ADDED)
eq_(event.event_type, TreeEvent.NODE_ADDED)
eq_(event.event_data.path, self.path + '/test_children')
eq_(event.event_data.data, b'test_children_1')
eq_(event.event_data.stat.version, 0)
self.client.set(self.path + '/test_children', b'test_children_2')
event = self.wait_cache(TreeEvent.NODE_UPDATED)
eq_(event.event_type, TreeEvent.NODE_UPDATED)
eq_(event.event_data.path, self.path + '/test_children')
eq_(event.event_data.data, b'test_children_2')
eq_(event.event_data.stat.version, 1)
self.client.delete(self.path + '/test_children')
event = self.wait_cache(TreeEvent.NODE_REMOVED)
eq_(event.event_type, TreeEvent.NODE_REMOVED)
eq_(event.event_data.path, self.path + '/test_children')
eq_(event.event_data.data, b'test_children_2')
eq_(event.event_data.stat.version, 1)
def test_subtree_operation(self):
self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
self.client.create(self.path + '/foo/bar/baz', makepath=True)
for relative_path in ('/foo', '/foo/bar', '/foo/bar/baz'):
event = self.wait_cache(TreeEvent.NODE_ADDED)
eq_(event.event_type, TreeEvent.NODE_ADDED)
eq_(event.event_data.path, self.path + relative_path)
eq_(event.event_data.data, b'')
eq_(event.event_data.stat.version, 0)
self.client.delete(self.path + '/foo', recursive=True)
for relative_path in ('/foo/bar/baz', '/foo/bar', '/foo'):
event = self.wait_cache(TreeEvent.NODE_REMOVED)
eq_(event.event_type, TreeEvent.NODE_REMOVED)
eq_(event.event_data.path, self.path + relative_path)
def test_get_data(self):
cache = self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
self.client.create(self.path + '/foo/bar/baz', b'@', makepath=True)
self.wait_cache(TreeEvent.NODE_ADDED)
self.wait_cache(TreeEvent.NODE_ADDED)
self.wait_cache(TreeEvent.NODE_ADDED)
with patch.object(cache, '_client'): # disable any remote operation
eq_(cache.get_data(self.path).data, b'')
eq_(cache.get_data(self.path).stat.version, 0)
eq_(cache.get_data(self.path + '/foo').data, b'')
eq_(cache.get_data(self.path + '/foo').stat.version, 0)
eq_(cache.get_data(self.path + '/foo/bar').data, b'')
eq_(cache.get_data(self.path + '/foo/bar').stat.version, 0)
eq_(cache.get_data(self.path + '/foo/bar/baz').data, b'@')
eq_(cache.get_data(self.path + '/foo/bar/baz').stat.version, 0)
def test_get_children(self):
cache = self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
self.client.create(self.path + '/foo/bar/baz', b'@', makepath=True)
self.wait_cache(TreeEvent.NODE_ADDED)
self.wait_cache(TreeEvent.NODE_ADDED)
self.wait_cache(TreeEvent.NODE_ADDED)
with patch.object(cache, '_client'): # disable any remote operation
eq_(cache.get_children(self.path + '/foo/bar/baz'), frozenset())
eq_(cache.get_children(self.path + '/foo/bar'), frozenset(['baz']))
eq_(cache.get_children(self.path + '/foo'), frozenset(['bar']))
eq_(cache.get_children(self.path), frozenset(['foo']))
@raises(ValueError)
def test_get_data_out_of_tree(self):
self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
self.cache.get_data('/out_of_tree')
@raises(ValueError)
def test_get_children_out_of_tree(self):
self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
self.cache.get_children('/out_of_tree')
def test_get_data_no_node(self):
cache = self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
with patch.object(cache, '_client'): # disable any remote operation
eq_(cache.get_data(self.path + '/non_exists'), None)
def test_get_children_no_node(self):
cache = self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
with patch.object(cache, '_client'): # disable any remote operation
eq_(cache.get_children(self.path + '/non_exists'), None)
def test_session_reconnected(self):
self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
self.client.create(self.path + '/foo')
event = self.wait_cache(TreeEvent.NODE_ADDED)
eq_(event.event_data.path, self.path + '/foo')
with self.spy_client('get_async') as get_data:
with self.spy_client('get_children_async') as get_children:
# session suspended
self.lose_connection(self.client.handler.event_object)
self.wait_cache(TreeEvent.CONNECTION_SUSPENDED)
# There are a serial refreshing operation here. But NODE_ADDED
# events will not be raised because the zxid of nodes are the
# same during reconnecting.
# connection restore
self.wait_cache(TreeEvent.CONNECTION_RECONNECTED)
# wait for outstanding operations
while self.cache._outstanding_ops > 0:
self.client.handler.sleep_func(0.1)
# inspect in-memory nodes
_node_root = self.cache._root
_node_foo = self.cache._root._children['foo']
# make sure that all nodes are refreshed
get_data.assert_has_calls([
call(self.path, watch=_node_root._process_watch),
call(self.path + '/foo', watch=_node_foo._process_watch),
], any_order=True)
get_children.assert_has_calls([
call(self.path, watch=_node_root._process_watch),
call(self.path + '/foo', watch=_node_foo._process_watch),
], any_order=True)
def test_root_recreated(self):
self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
# remove root node
self.client.delete(self.path)
event = self.wait_cache(TreeEvent.NODE_REMOVED)
eq_(event.event_type, TreeEvent.NODE_REMOVED)
eq_(event.event_data.data, b'')
eq_(event.event_data.path, self.path)
eq_(event.event_data.stat.version, 0)
# re-create root node
self.client.ensure_path(self.path)
event = self.wait_cache(TreeEvent.NODE_ADDED)
eq_(event.event_type, TreeEvent.NODE_ADDED)
eq_(event.event_data.data, b'')
eq_(event.event_data.path, self.path)
eq_(event.event_data.stat.version, 0)
self.assertTrue(
self.cache._outstanding_ops >= 0,
'unexpected outstanding ops %r' % self.cache._outstanding_ops)
def test_exception_handler(self):
error_value = FakeException()
error_handler = Mock()
with patch.object(TreeNode, 'on_deleted') as on_deleted:
on_deleted.side_effect = [error_value]
self.make_cache()
self.cache.listen_fault(error_handler)
self.cache.close()
error_handler.assert_called_once_with(error_value)
def test_exception_suppressed(self):
self.make_cache()
self.wait_cache(since=TreeEvent.INITIALIZED)
# stoke up ConnectionClosedError
self.client.stop()
self.client.close()
self.client.handler.start() # keep the async completion
self.wait_cache(since=TreeEvent.CONNECTION_LOST)
with patch.object(TreeNode, 'on_created') as on_created:
self.cache._root._call_client('exists', '/')
self.cache._root._call_client('get', '/')
self.cache._root._call_client('get_children', '/')
self.wait_cache(since=TreeEvent.INITIALIZED)
on_created.assert_not_called()
eq_(self.cache._outstanding_ops, 0)
class FakeException(Exception):
pass
|
