class LayoutTest(TestCase):
def setUp(self):
self.log = self.capture_logging("juju.state.init")
zookeeper.set_debug_level(0)
self.client = ZookeeperClient(get_test_zookeeper_address())
self.identity = make_identity("admin:genie")
self.layout = StateHierarchy(
self.client, self.identity, "i-abcdef", "dummy")
return self.client.connect()
def tearDown(self):
deleteTree(handle=self.client.handle)
self.client.close()
@inlineCallbacks
def assert_existence_and_acl(self, path):
exists = yield self.client.exists(path)
self.assertTrue(exists)
acls, stat = yield self.client.get_acl(path)
found_admin_acl = False
for acl in acls:
if acl["id"] == self.identity \
and acl["perms"] == zookeeper.PERM_ALL:
found_admin_acl = True
break
self.assertTrue(found_admin_acl)
@inlineCallbacks
def test_initialize(self):
yield self.layout.initialize()
yield self.assert_existence_and_acl("/charms")
yield self.assert_existence_and_acl("/services")
yield self.assert_existence_and_acl("/units")
yield self.assert_existence_and_acl("/machines")
yield self.assert_existence_and_acl("/relations")
yield self.assert_existence_and_acl("/initialized")
machine_state_manager = MachineStateManager(self.client)
machine_state = yield machine_state_manager.get_machine_state(0)
self.assertTrue(machine_state)
instance_id = yield machine_state.get_instance_id()
self.assertEqual(instance_id, "i-abcdef")
settings_manager = GlobalSettingsStateManager(self.client)
self.assertEqual((yield settings_manager.get_provider_type()), "dummy")
self.assertEqual(
self.log.getvalue().strip(),
"Initializing zookeeper hierarchy")
def open_client(self, credentials=None):
"""
Open a zookeeper client, optionally authenticating with the
credentials if given.
"""
client = ZookeeperClient("127.0.0.1:2181")
self.clients.append(client)
yield client.connect()
if credentials:
d = client.add_auth("digest", credentials)
# hack to keep auth fast
yield client.exists("/")
yield d
returnValue(client)
def open_client(self, credentials=None):
"""
Open a zookeeper client, optionally authenticating with the
credentials if given.
"""
client = ZookeeperClient("127.0.0.1:2181")
self.clients.append(client)
yield client.connect()
if credentials:
d = client.add_auth("digest", credentials)
# hack to keep auth fast
yield client.exists("/")
yield d
returnValue(client)
class LayoutTest(TestCase):
def setUp(self):
self.log = self.capture_logging("juju.state.init")
zookeeper.set_debug_level(0)
self.client = ZookeeperClient(get_test_zookeeper_address())
self.identity = make_identity("admin:genie")
self.layout = StateHierarchy(self.client, self.identity, "i-abcdef",
"dummy")
return self.client.connect()
def tearDown(self):
deleteTree(handle=self.client.handle)
self.client.close()
@inlineCallbacks
def assert_existence_and_acl(self, path):
exists = yield self.client.exists(path)
self.assertTrue(exists)
acls, stat = yield self.client.get_acl(path)
found_admin_acl = False
for acl in acls:
if acl["id"] == self.identity \
and acl["perms"] == zookeeper.PERM_ALL:
found_admin_acl = True
break
self.assertTrue(found_admin_acl)
@inlineCallbacks
def test_initialize(self):
yield self.layout.initialize()
yield self.assert_existence_and_acl("/charms")
yield self.assert_existence_and_acl("/services")
yield self.assert_existence_and_acl("/units")
yield self.assert_existence_and_acl("/machines")
yield self.assert_existence_and_acl("/relations")
yield self.assert_existence_and_acl("/initialized")
machine_state_manager = MachineStateManager(self.client)
machine_state = yield machine_state_manager.get_machine_state(0)
self.assertTrue(machine_state)
instance_id = yield machine_state.get_instance_id()
self.assertEqual(instance_id, "i-abcdef")
settings_manager = GlobalSettingsStateManager(self.client)
self.assertEqual((yield settings_manager.get_provider_type()), "dummy")
self.assertEqual(self.log.getvalue().strip(),
"Initializing zookeeper hierarchy")
def test_managed_zookeeper(self):
zookeeper.set_debug_level(0)
# Start zookeeper
data_dir = self.makeDir()
instance = Zookeeper(data_dir, 12345)
yield instance.start()
self.assertTrue(instance.running)
# Connect a client
client = ZookeeperClient("127.0.1.1:12345")
yield client.connect()
stat = yield client.exists("/")
yield client.close()
self.assertTrue(stat)
# Stop Instance
yield instance.stop()
self.assertFalse(instance.running)
self.assertFalse(os.path.exists(data_dir))
def test_managed_zookeeper(self):
zookeeper.set_debug_level(0)
# Start zookeeper
data_dir = self.makeDir()
instance = Zookeeper(data_dir, 12345)
yield instance.start()
self.assertTrue(instance.running)
# Connect a client
client = ZookeeperClient("127.0.1.1:12345")
yield client.connect()
stat = yield client.exists("/")
yield client.close()
self.assertTrue(stat)
# Stop Instance
yield instance.stop()
self.assertFalse(instance.running)
self.assertFalse(os.path.exists(data_dir))
class ClientSessionTests(ZookeeperTestCase):
def setUp(self):
super(ClientSessionTests, self).setUp()
self.cluster.start()
self.client = None
self.client2 = None
zookeeper.deterministic_conn_order(True)
zookeeper.set_debug_level(0)
@property
def cluster(self):
return CLUSTER
def tearDown(self):
super(ClientSessionTests, self).tearDown()
if self.client:
self.client.close()
self.cluster.reset()
@inlineCallbacks
def test_client_session_migration(self):
"""A client will automatically rotate servers to ensure a connection.
A client connected to multiple servers, will transparently
migrate amongst them, as individual servers can no longer be
reached. A client's session will be maintined.
"""
# Connect to the Zookeeper Cluster
servers = ",".join([s.address for s in self.cluster])
self.client = ZookeeperClient(servers)
yield self.client.connect()
yield self.client.create("/hello", flags=zookeeper.EPHEMERAL)
# Shutdown the server the client is connected to
self.cluster[0].stop()
# Wait for the shutdown and cycle, if we don't wait we'll
# get a zookeeper connectionloss exception on occassion.
yield self.sleep(0.1)
self.assertTrue(self.client.connected)
exists = yield self.client.exists("/hello")
self.assertTrue(exists)
@inlineCallbacks
def test_client_watch_migration(self):
"""On server rotation, extant watches are still active.
A client connected to multiple servers, will transparently
migrate amongst them, as individual servers can no longer be
reached. Watch deferreds issued from the same client instance will
continue to function as the session is maintained.
"""
session_events = []
def session_event_callback(connection, e):
session_events.append(e)
# Connect to the Zookeeper Cluster
servers = ",".join([s.address for s in self.cluster])
self.client = ZookeeperClient(servers)
self.client.set_session_callback(session_event_callback)
yield self.client.connect()
# Setup a watch
yield self.client.create("/hello")
exists_d, watch_d = self.client.exists_and_watch("/hello")
yield exists_d
# Shutdown the server the client is connected to
self.cluster[0].stop()
# Wait for the shutdown and cycle, if we don't wait we'll
# get occasionally get a zookeeper connectionloss exception.
yield self.sleep(0.1)
# The session events that would have been ignored are sent
# to the session event callback.
self.assertTrue(session_events)
self.assertTrue(self.client.connected)
# If we delete the node, we'll see the watch fire.
yield self.client.delete("/hello")
event = yield watch_d
self.assertEqual(event.type_name, "deleted")
self.assertEqual(event.path, "/hello")
@inlineCallbacks
def test_connection_error_handler(self):
"""A callback can be specified for connection errors.
We can specify a callback for connection errors, that
can perform recovery for a disconnected client, restablishing
"""
@inlineCallbacks
def connection_error_handler(connection, error):
# Moved management of this connection attribute out of the
# default behavior for a connection exception, to support
# the retry facade. Under the hood libzk is going to be
# trying to transparently reconnect
connection.connected = False
# On loss of the connection, reconnect the client w/ same session.
yield connection.connect(
self.cluster[1].address, client_id=connection.client_id)
returnValue(23)
self.client = ZookeeperClient(self.cluster[0].address)
self.client.set_connection_error_callback(connection_error_handler)
yield self.client.connect()
yield self.client.create("/hello")
exists_d, watch_d = self.client.exists_and_watch("/hello")
yield exists_d
# Shutdown the server the client is connected to
self.cluster[0].stop()
yield self.sleep(0.1)
# Results in connection loss exception, and invoking of error handler.
result = yield self.client.exists("/hello")
# The result of the error handler is returned to the api
self.assertEqual(result, 23)
exists = yield self.client.exists("/hello")
self.assertTrue(exists)
@inlineCallbacks
def test_client_session_expiration_event(self):
"""A client which recieves a session expiration event.
"""
session_events = []
events_received = Deferred()
def session_event_callback(connection, e):
session_events.append(e)
if len(session_events) == 8:
events_received.callback(True)
# Connect to a node in the cluster and establish a watch
self.client = ZookeeperClient(self.cluster[0].address)
self.client.set_session_callback(session_event_callback)
yield self.client.connect()
# Setup some watches to verify they are cleaned out on expiration.
d, e_watch_d = self.client.exists_and_watch("/")
yield d
d, g_watch_d = self.client.get_and_watch("/")
yield d
d, c_watch_d = self.client.get_children_and_watch("/")
yield d
# Connect a client to the same session on a different node.
self.client2 = ZookeeperClient(self.cluster[1].address)
yield self.client2.connect(client_id=self.client.client_id)
# Close the new client and wait for the event propogation
yield self.client2.close()
# It can take some time for this to propagate
yield events_received
self.assertEqual(len(session_events), 8)
# The last four (conn + 3 watches) are all expired
for evt in session_events[4:]:
self.assertEqual(evt.state_name, "expired")
# The connection is dead without reconnecting.
yield self.assertFailure(
self.client.exists("/"),
NotConnectedException, ConnectionException)
self.assertTrue(self.client.unrecoverable)
yield self.assertFailure(e_watch_d, zookeeper.SessionExpiredException)
yield self.assertFailure(g_watch_d, zookeeper.SessionExpiredException)
yield self.assertFailure(c_watch_d, zookeeper.SessionExpiredException)
# If a reconnect attempt is made with a dead session id
print "reconnect"
yield self.client.connect(client_id=self.client.client_id)
yield self.assertFailure(
self.client.get_children("/"),
NotConnectedException, ConnectionException)
test_client_session_expiration_event.timeout = 10
@inlineCallbacks
def test_client_reconnect_session_on_different_server(self):
"""On connection failure, An application can choose to use a
new connection with which to reconnect to a different member
of the zookeeper cluster, reacquiring the extant session.
A large obvious caveat to using a new client instance rather
than reconnecting the existing client, is that even though the
session has outstanding watches, the watch callbacks/deferreds
won't be active unless the client instance used to create them
is connected.
"""
session_events = []
def session_event_callback(connection, e):
session_events.append(e)
# Connect to a node in the cluster and establish a watch
self.client = ZookeeperClient(self.cluster[2].address)
self.client.set_session_callback(session_event_callback)
yield self.client.connect()
yield self.client.create("/hello", flags=zookeeper.EPHEMERAL)
self.assertTrue((yield self.client.exists("/hello")))
# Shutdown the server the client is connected to
self.cluster[2].stop()
yield self.sleep(0.1)
# Verify we got a session event regarding the down server
self.assertTrue(session_events)
# Open up a new connection to a different server with same session
self.client2 = ZookeeperClient(self.cluster[0].address)
yield self.client2.connect(client_id=self.client.client_id)
# Close the old disconnected client
self.client.close()
# Verify the ephemeral still exists
exists = yield self.client2.exists("/hello")
self.assertTrue(exists)
# Destroy the session and reconnect
self.client2.close()
yield self.client.connect(self.cluster[0].address)
# Ephemeral is destroyed when the session closed.
exists = yield self.client.exists("/hello")
self.assertFalse(exists)
class NodeTest(TestCase):
def setUp(self):
super(NodeTest, self).setUp()
zookeeper.set_debug_level(zookeeper.LOG_LEVEL_ERROR)
self.client = ZookeeperClient("127.0.0.1:2181", 2000)
d = self.client.connect()
self.client2 = None
def create_zoo(client):
client.create("/zoo")
d.addCallback(create_zoo)
return d
def tearDown(self):
super(NodeTest, self).tearDown()
deleteTree(handle=self.client.handle)
if self.client.connected:
self.client.close()
if self.client2 and self.client2.connected:
self.client2.close()
zookeeper.set_debug_level(zookeeper.LOG_LEVEL_DEBUG)
def _make_digest_identity(self, credentials):
user, password = credentials.split(":")
digest = hashlib.new("sha1", credentials).digest()
return "%s:%s" % (user, base64.b64encode(digest))
def test_node_name_and_path(self):
"""
Each node has name and path.
"""
node = ZNode("/zoo/rabbit", self.client)
self.assertEqual(node.name, "rabbit")
self.assertEqual(node.path, "/zoo/rabbit")
def test_node_event_repr(self):
"""
Node events have a human-readable representation.
"""
node = ZNode("/zoo", self.client)
event = NodeEvent(4, None, node)
self.assertEqual(repr(event), "<NodeEvent child at '/zoo'>")
@inlineCallbacks
def test_node_exists_nonexistant(self):
"""
A node knows whether it exists or not.
"""
node = ZNode("/zoo/rabbit", self.client)
exists = yield node.exists()
self.assertFalse(exists)
@inlineCallbacks
def test_node_set_data_on_nonexistant(self):
"""
Setting data on a non existant node raises a no node exception.
"""
node = ZNode("/zoo/rabbit", self.client)
d = node.set_data("big furry ears")
self.failUnlessFailure(d, zookeeper.NoNodeException)
yield d
@inlineCallbacks
def test_node_create_set_data(self):
"""
A node can be created and have its data set.
"""
node = ZNode("/zoo/rabbit", self.client)
data = "big furry ears"
yield node.create(data)
exists = yield self.client.exists("/zoo/rabbit")
self.assertTrue(exists)
node_data = yield node.get_data()
self.assertEqual(data, node_data)
data = data*2
yield node.set_data(data)
node_data = yield node.get_data()
self.assertEqual(data, node_data)
@inlineCallbacks
def test_node_get_data(self):
"""
Data can be fetched from a node.
"""
yield self.client.create("/zoo/giraffe", "mouse")
data = yield ZNode("/zoo/giraffe", self.client).get_data()
self.assertEqual(data, "mouse")
@inlineCallbacks
def test_node_get_data_nonexistant(self):
"""
Attempting to fetch data from a nonexistant node returns
a non existant error.
"""
d = ZNode("/zoo/giraffe", self.client).get_data()
self.failUnlessFailure(d, zookeeper.NoNodeException)
yield d
@inlineCallbacks
def test_node_get_acl(self):
"""
The ACL for a node can be retrieved.
"""
yield self.client.create("/zoo/giraffe")
acl = yield ZNode("/zoo/giraffe", self.client).get_acl()
self.assertEqual(len(acl), 1)
self.assertEqual(acl[0]['scheme'], 'world')
def test_node_get_acl_nonexistant(self):
"""
The fetching the ACL for a non-existant node results in an error.
"""
node = ZNode("/zoo/giraffe", self.client)
def assert_failed(failed):
if not isinstance(failed, Failure):
self.fail("Should have failed")
self.assertTrue(
isinstance(failed.value, zookeeper.NoNodeException))
d = node.get_acl()
d.addBoth(assert_failed)
return d
@inlineCallbacks
def test_node_set_acl(self):
"""
The ACL for a node can be modified.
"""
path = yield self.client.create("/zoo/giraffe")
credentials = "zebra:moon"
acl = [{"id": self._make_digest_identity(credentials),
"scheme": "digest",
"perms":zookeeper.PERM_ALL}]
node = ZNode(path, self.client)
# little hack around slow auth issue 770 zookeeper
d = self.client.add_auth("digest", credentials)
yield node.set_acl(acl)
yield d
node_acl, stat = yield self.client.get_acl(path)
self.assertEqual(node_acl, acl)
@inlineCallbacks
def test_node_set_data_update_with_cached_exists(self):
"""
Data can be set on an existing node, updating it
in place.
"""
node = ZNode("/zoo/monkey", self.client)
yield self.client.create("/zoo/monkey", "stripes")
exists = yield node.exists()
self.assertTrue(exists)
yield node.set_data("banana")
data, stat = yield self.client.get("/zoo/monkey")
self.assertEqual(data, "banana")
@inlineCallbacks
def test_node_set_data_update_with_invalid_cached_exists(self):
"""
If a node is deleted, attempting to set data on it
raises a no node exception.
"""
node = ZNode("/zoo/monkey", self.client)
yield self.client.create("/zoo/monkey", "stripes")
exists = yield node.exists()
self.assertTrue(exists)
yield self.client.delete("/zoo/monkey")
d = node.set_data("banana")
self.failUnlessFailure(d, zookeeper.NoNodeException)
yield d
@inlineCallbacks
def test_node_set_data_update_with_exists(self):
"""
Data can be set on an existing node, updating it
in place.
"""
node = ZNode("/zoo/monkey", self.client)
yield self.client.create("/zoo/monkey", "stripes")
yield node.set_data("banana")
data, stat = yield self.client.get("/zoo/monkey")
self.assertEqual(data, "banana")
@inlineCallbacks
def test_node_exists_with_watch_nonexistant(self):
"""
The node's existance can be checked with the exist_watch api
a deferred will be returned and any node level events,
created, deleted, modified invoke the callback. You can
get these create event callbacks for non existant nodes.
"""
node = ZNode("/zoo/elephant", self.client)
exists, watch = yield node.exists_and_watch()
self.assertFalse((yield exists))
yield self.client.create("/zoo/elephant")
event = yield watch
self.assertEqual(event.type, zookeeper.CREATED_EVENT)
self.assertEqual(event.path, node.path)
@inlineCallbacks
def test_node_get_data_with_watch_on_update(self):
"""
Subscribing to a node will get node update events.
"""
yield self.client.create("/zoo/elephant")
node = ZNode("/zoo/elephant", self.client)
data, watch = yield node.get_data_and_watch()
yield self.client.set("/zoo/elephant")
event = yield watch
self.assertEqual(event.type, zookeeper.CHANGED_EVENT)
self.assertEqual(event.path, "/zoo/elephant")
@inlineCallbacks
def test_node_get_data_with_watch_on_delete(self):
"""
Subscribing to a node will get node deletion events.
"""
yield self.client.create("/zoo/elephant")
node = ZNode("/zoo/elephant", self.client)
data, watch = yield node.get_data_and_watch()
yield self.client.delete("/zoo/elephant")
event = yield watch
self.assertEqual(event.type, zookeeper.DELETED_EVENT)
self.assertEqual(event.path, "/zoo/elephant")
@inlineCallbacks
def test_node_children(self):
"""
A node's children can be introspected.
"""
node = ZNode("/zoo", self.client)
node_path_a = yield self.client.create("/zoo/lion")
node_path_b = yield self.client.create("/zoo/tiger")
children = yield node.get_children()
children.sort()
self.assertEqual(children[0].path, node_path_a)
self.assertEqual(children[1].path, node_path_b)
@inlineCallbacks
def test_node_children_by_prefix(self):
"""
A node's children can be introspected optionally with a prefix.
"""
node = ZNode("/zoo", self.client)
node_path_a = yield self.client.create("/zoo/lion")
yield self.client.create("/zoo/tiger")
children = yield node.get_children("lion")
children.sort()
self.assertEqual(children[0].path, node_path_a)
self.assertEqual(len(children), 1)
@inlineCallbacks
def test_node_get_children_with_watch_create(self):
"""
A node's children can explicitly be watched to given existance
events for node creation and destruction.
"""
node = ZNode("/zoo", self.client)
children, watch = yield node.get_children_and_watch()
yield self.client.create("/zoo/lion")
event = yield watch
self.assertEqual(event.path, "/zoo")
self.assertEqual(event.type, zookeeper.CHILD_EVENT)
self.assertEqual(event.type_name, "child")
@inlineCallbacks
def test_node_get_children_with_watch_delete(self):
"""
A node's children can explicitly be watched to given existance
events for node creation and destruction.
"""
node = ZNode("/zoo", self.client)
yield self.client.create("/zoo/lion")
children, watch = yield node.get_children_and_watch()
yield self.client.delete("/zoo/lion")
event = yield watch
self.assertEqual(event.path, "/zoo")
self.assertEqual(event.type, zookeeper.CHILD_EVENT)
@inlineCallbacks
def test_bad_version_error(self):
"""
The node captures the node version on any read operations, which
it utilizes for write operations. On a concurrent modification error
the node return a bad version error, this also clears the cached
state so subsequent modifications will be against the latest version,
unless the cache is seeded again by a read operation.
"""
node = ZNode("/zoo/lion", self.client)
self.client2 = ZookeeperClient("127.0.0.1:2181")
yield self.client2.connect()
yield self.client.create("/zoo/lion", "mouse")
yield node.get_data()
yield self.client2.set("/zoo/lion", "den2")
data = yield self.client.exists("/zoo/lion")
self.assertEqual(data['version'], 1)
d = node.set_data("zebra")
self.failUnlessFailure(d, zookeeper.BadVersionException)
yield d
# after failure the cache is deleted, and a set proceeds
yield node.set_data("zebra")
data = yield node.get_data()
self.assertEqual(data, "zebra")
class WatchDeliveryConnectionFailedTest(ZookeeperTestCase):
"""Watches are still sent on reconnect.
"""
def setUp(self):
super(WatchDeliveryConnectionFailedTest, self).setUp()
self.proxy = ProxyFactory("127.0.0.1", 2181)
self.proxy_port = reactor.listenTCP(0, self.proxy)
host = self.proxy_port.getHost()
self.proxied_client = ZookeeperClient(
"%s:%s" % (host.host, host.port))
self.direct_client = ZookeeperClient("127.0.0.1:2181", 3000)
self.session_events = []
def session_event_collector(conn, event):
self.session_events.append(event)
self.proxied_client.set_session_callback(session_event_collector)
return self.direct_client.connect()
@inlineCallbacks
def tearDown(self):
zookeeper.set_debug_level(0)
if self.proxied_client.connected:
yield self.proxied_client.close()
if not self.direct_client.connected:
yield self.direct_client.connect()
utils.deleteTree(handle=self.direct_client.handle)
yield self.direct_client.close()
self.proxy.lose_connection()
yield self.proxy_port.stopListening()
def verify_events(self, events, expected):
"""Verify the state of the session events encountered.
"""
for value, state in zip([e.state_name for e in events], expected):
self.assertEqual(value, state)
@inlineCallbacks
def test_child_watch_fires_upon_reconnect(self):
yield self.proxied_client.connect()
# Setup tree
cpath = "/test-tree"
yield self.direct_client.create(cpath)
# Setup watch
child_d, watch_d = self.proxied_client.get_children_and_watch(cpath)
self.assertEqual((yield child_d), [])
# Kill the connection and fire the watch
self.proxy.lose_connection()
yield self.direct_client.create(
cpath + "/abc", flags=zookeeper.SEQUENCE)
# We should still get the child event.
yield watch_d
# We get two pairs of (connecting, connected) for the conn and watch
self.assertEqual(len(self.session_events), 4)
self.verify_events(
self.session_events,
("connecting", "connecting", "connected", "connected"))
@inlineCallbacks
def test_exists_watch_fires_upon_reconnect(self):
yield self.proxied_client.connect()
cpath = "/test"
# Setup watch
exists_d, watch_d = self.proxied_client.exists_and_watch(cpath)
self.assertEqual((yield exists_d), None)
# Kill the connection and fire the watch
self.proxy.lose_connection()
yield self.direct_client.create(cpath)
# We should still get the exists event.
yield watch_d
# We get two pairs of (connecting, connected) for the conn and watch
self.assertEqual(len(self.session_events), 4)
self.verify_events(
self.session_events,
("connecting", "connecting", "connected", "connected"))
@inlineCallbacks
def test_get_watch_fires_upon_reconnect(self):
yield self.proxied_client.connect()
# Setup tree
cpath = "/test"
yield self.direct_client.create(cpath, "abc")
# Setup watch
get_d, watch_d = self.proxied_client.get_and_watch(cpath)
content, stat = yield get_d
self.assertEqual(content, "abc")
# Kill the connection and fire the watch
self.proxy.lose_connection()
yield self.direct_client.set(cpath, "xyz")
# We should still get the exists event.
yield watch_d
# We also two pairs of (connecting, connected) for the conn and watch
self.assertEqual(len(self.session_events), 4)
self.verify_events(
self.session_events,
("connecting", "connecting", "connected", "connected"))
@inlineCallbacks
def test_watch_delivery_failure_resends(self):
"""Simulate a network failure for the watch delivery
The zk server effectively sends the watch delivery to the client,
but the client never recieves it.
"""
yield self.proxied_client.connect()
cpath = "/test"
# Setup watch
exists_d, watch_d = self.proxied_client.exists_and_watch(cpath)
self.assertEqual((yield exists_d), None)
# Pause the connection fire the watch, and blackhole the data.
self.proxy.set_blocked(True)
yield self.direct_client.create(cpath)
self.proxy.set_blocked(False)
self.proxy.lose_connection()
# We should still get the exists event.
yield watch_d
@inlineCallbacks
def test_session_exception(self):
"""Test session expiration.
On a single server, the best way to produce a session expiration is
timing out the client.
"""
yield self.proxied_client.connect()
data = yield self.proxied_client.exists("/")
self.assertTrue(data)
self.proxy.set_blocked(True)
# Wait for session expiration, on a single server options are limited
yield self.sleep(15)
# Unblock the proxy for next connect, and then drop the connection.
self.proxy.set_blocked(False)
self.proxy.lose_connection()
# Wait for a reconnect (see below why we can't just use a watch here)
yield self.sleep(2)
yield self.assertFailure(
self.proxied_client.get("/a"),
zookeeper.SessionExpiredException)
self.assertEqual(self.session_events[-1].state_name, "expired")
@inlineCallbacks
def xtest_binding_bug_session_exception(self):
"""This test triggers an exception in the python-zookeeper binding.
File "txzookeeper/client.py", line 491, in create
self.handle, path, data, acls, flags, callback)
exceptions.SystemError: error return without exception set
"""
yield self.proxied_client.connect()
data_d, watch_d = yield self.proxied_client.exists_and_watch("/")
self.assertTrue((yield data_d))
self.proxy.set_blocked(True)
# Wait for session expiration, on a single server options are limited
yield self.sleep(15)
# Unblock the proxy for next connect, and then drop the connection.
self.proxy.set_blocked(False)
self.proxy.lose_connection()
# Wait for a reconnect
yield self.assertFailure(watch_d, zookeeper.SessionExpiredException)
# Leads to bindings bug failure
yield self.assertFailure(
self.proxied_client.get("/a"),
zookeeper.SessionExpiredException)
self.assertEqual(self.session_events[-1].state_name, "expired")
class YAMLStateTest(TestCase):
@inlineCallbacks
def setUp(self):
zookeeper.set_debug_level(0)
self.client = ZookeeperClient(get_test_zookeeper_address())
yield self.client.connect()
self.path = "/zoo"
@inlineCallbacks
def tearDown(self):
exists = yield self.client.exists(self.path)
if exists:
yield remove_tree(self.client, self.path)
@inlineCallbacks
def test_get_empty(self):
"""Verify getting an empty node works as expected."""
path = yield self.client.create(self.path)
node = YAMLState(self.client, path)
self.assertEqual(node, {})
@inlineCallbacks
def test_access_wo_create(self):
"""Verify accessing data for a non-existant node works as expected."""
node = YAMLState(self.client, self.path)
yield node.read()
self.assertEqual(node, {})
def test_set_wo_read(self):
"""Verify that not calling read before mutation raises."""
node = YAMLState(self.client, self.path)
self.assertRaises(ValueError, node.__setitem__, "alpha", "beta")
self.assertRaises(ValueError, node.update, {"alpha": "beta"})
@inlineCallbacks
def test_set_wo_write(self):
"""Check that get resolves from the internal write buffer.
set/get pairs w/o write should present a view of the state
reflecting local change. Verify that w/o write local data
appears on subsequent calls but that zk state hasn't been
changed.
"""
path = yield self.client.create(self.path)
node = YAMLState(self.client, path)
yield node.read()
options = dict(alpha="beta", one=1)
node.update(options)
self.assertEqual(node, options)
zk_data, stat = yield self.client.get(self.path)
# the node isn't created yet in zk
self.assertEqual(zk_data, "")
@inlineCallbacks
def test_set_w_write(self):
"""Verify that write updates the local and zk state.
When write is called we expect that zk state reflects this. We
also expect calls to get to expect the reflected state.
"""
node = YAMLState(self.client, self.path)
yield node.read()
options = dict(alpha="beta", one=1)
node.update(options)
changes = yield node.write()
self.assertEqual(
set(changes),
set([
AddedItem(key='alpha', new='beta'),
AddedItem(key='one', new=1)
]))
# a local get should reflect proper data
self.assertEqual(node, options)
# and a direct look at zk should work as well
zk_data, stat = yield self.client.get(self.path)
zk_data = yaml.load(zk_data)
self.assertEqual(zk_data, options)
@inlineCallbacks
def test_conflict_on_set(self):
"""Version conflict error tests.
Test that two YAMLState objects writing to the same path can
and will throw version errors when elements become out of
read.
"""
node = YAMLState(self.client, self.path)
node2 = YAMLState(self.client, self.path)
yield node.read()
yield node2.read()
options = dict(alpha="beta", one=1)
node.update(options)
yield node.write()
node2.update(options)
changes = yield node2.write()
self.assertEqual(
set(changes),
set([AddedItem("alpha", "beta"),
AddedItem("one", 1)]))
# first read node2
self.assertEqual(node, options)
# write on node 1
options2 = dict(alpha="gamma", one="two")
node.update(options2)
changes = yield node.write()
self.assertEqual(
set(changes),
set([
ModifiedItem("alpha", "beta", "gamma"),
ModifiedItem("one", 1, "two")
]))
# verify that node 1 reports as expected
self.assertEqual(node, options2)
# verify that node2 has the older data still
self.assertEqual(node2, options)
# now issue a set/write from node2
# this will merge the data deleting 'one'
# and updating other values
options3 = dict(alpha="cappa", new="next")
node2.update(options3)
del node2["one"]
expected = dict(alpha="cappa", new="next")
changes = yield node2.write()
self.assertEqual(
set(changes),
set([
DeletedItem("one", 1),
ModifiedItem("alpha", "beta", "cappa"),
AddedItem("new", "next")
]))
self.assertEqual(expected, node2)
# but node still reflects the old data
self.assertEqual(node, options2)
@inlineCallbacks
def test_setitem(self):
node = YAMLState(self.client, self.path)
yield node.read()
options = dict(alpha="beta", one=1)
node["alpha"] = "beta"
node["one"] = 1
changes = yield node.write()
self.assertEqual(
set(changes),
set([AddedItem("alpha", "beta"),
AddedItem("one", 1)]))
# a local get should reflect proper data
self.assertEqual(node, options)
# and a direct look at zk should work as well
zk_data, stat = yield self.client.get(self.path)
zk_data = yaml.load(zk_data)
self.assertEqual(zk_data, options)
@inlineCallbacks
def test_multiple_reads(self):
"""Calling read resets state to ZK after multiple round-trips."""
node = YAMLState(self.client, self.path)
yield node.read()
node.update({"alpha": "beta", "foo": "bar"})
self.assertEqual(node["alpha"], "beta")
self.assertEqual(node["foo"], "bar")
yield node.read()
# A read resets the data to the empty state
self.assertEqual(node, {})
node.update({"alpha": "beta", "foo": "bar"})
changes = yield node.write()
self.assertEqual(
set(changes),
set([AddedItem("alpha", "beta"),
AddedItem("foo", "bar")]))
# A write retains the newly set values
self.assertEqual(node["alpha"], "beta")
self.assertEqual(node["foo"], "bar")
# now get another state instance and change zk state
node2 = YAMLState(self.client, self.path)
yield node2.read()
node2.update({"foo": "different"})
changes = yield node2.write()
self.assertEqual(changes, [ModifiedItem("foo", "bar", "different")])
# This should pull in the new state (and still have the merged old.
yield node.read()
self.assertEqual(node["alpha"], "beta")
self.assertEqual(node["foo"], "different")
def test_dictmixin_usage(self):
"""Verify that the majority of dict operation function."""
node = YAMLState(self.client, self.path)
yield node.read()
node.update({"alpha": "beta", "foo": "bar"})
self.assertEqual(node, {"alpha": "beta", "foo": "bar"})
result = node.pop("foo")
self.assertEqual(result, "bar")
self.assertEqual(node, {"alpha": "beta"})
node["delta"] = "gamma"
self.assertEqual(set(node.keys()), set(("alpha", "delta")))
result = list(node.iteritems())
self.assertIn(("alpha", "beta"), result)
self.assertIn(("delta", "gamma"), result)
@inlineCallbacks
def test_del_empties_state(self):
d = YAMLState(self.client, self.path)
yield d.read()
d["a"] = "foo"
changes = yield d.write()
self.assertEqual(changes, [AddedItem("a", "foo")])
del d["a"]
changes = yield d.write()
self.assertEqual(changes, [DeletedItem("a", "foo")])
self.assertEqual(d, {})
@inlineCallbacks
def test_read_resync(self):
d1 = YAMLState(self.client, self.path)
yield d1.read()
d1["a"] = "foo"
changes = yield d1.write()
self.assertEqual(changes, [AddedItem("a", "foo")])
d2 = YAMLState(self.client, self.path)
yield d2.read()
del d2["a"]
changes = yield d2.write()
self.assertEqual(changes, [DeletedItem("a", "foo")])
d2["a"] = "bar"
changes = yield d2.write()
self.assertEqual(changes, [AddedItem("a", "bar")])
zk_data, stat = yield self.client.get(self.path)
yield d1.read()
# d1 should pick up the new value (from d2) on a read
zk_data, stat = yield self.client.get(self.path)
self.assertEqual(d1["a"], "bar")
@inlineCallbacks
def test_multiple_writes(self):
d1 = YAMLState(self.client, self.path)
yield d1.read()
d1.update(dict(foo="bar", this="that"))
changes = yield d1.write()
self.assertEqual(
set(changes),
set([AddedItem("foo", "bar"),
AddedItem("this", "that")]))
del d1["this"]
d1["another"] = "value"
changes = yield d1.write()
self.assertEqual(
set(changes),
set([DeletedItem("this", "that"),
AddedItem("another", "value")]))
expected = {"foo": "bar", "another": "value"}
self.assertEqual(d1, expected)
changes = yield d1.write()
self.assertEqual(changes, [])
self.assertEqual(d1, expected)
yield d1.read()
self.assertEqual(d1, expected)
# This shouldn't write any changes
changes = yield d1.write()
self.assertEqual(changes, [])
self.assertEqual(d1, expected)
@inlineCallbacks
def test_write_twice(self):
d1 = YAMLState(self.client, self.path)
yield d1.read()
d1["a"] = "foo"
changes = yield d1.write()
self.assertEqual(changes, [AddedItem("a", "foo")])
d2 = YAMLState(self.client, self.path)
yield d2.read()
d2["a"] = "bar"
changes = yield d2.write()
self.assertEqual(changes, [ModifiedItem("a", "foo", "bar")])
# Shouldn't write again. Changes were already
# flushed and acted upon by other parties.
changes = yield d1.write()
self.assertEqual(changes, [])
yield d1.read()
self.assertEquals(d1, d2)
@inlineCallbacks
def test_read_requires_node(self):
"""Validate that read raises when required=True."""
d1 = YAMLState(self.client, self.path)
yield self.assertFailure(d1.read(True), StateNotFound)
class YAMLStateTest(TestCase):
@inlineCallbacks
def setUp(self):
zookeeper.set_debug_level(0)
self.client = ZookeeperClient(get_test_zookeeper_address())
yield self.client.connect()
self.path = "/zoo"
@inlineCallbacks
def tearDown(self):
exists = yield self.client.exists(self.path)
if exists:
yield remove_tree(self.client, self.path)
@inlineCallbacks
def test_get_empty(self):
"""Verify getting an empty node works as expected."""
path = yield self.client.create(self.path)
node = YAMLState(self.client, path)
self.assertEqual(node, {})
@inlineCallbacks
def test_access_wo_create(self):
"""Verify accessing data for a non-existant node works as expected."""
node = YAMLState(self.client, self.path)
yield node.read()
self.assertEqual(node, {})
def test_set_wo_read(self):
"""Verify that not calling read before mutation raises."""
node = YAMLState(self.client, self.path)
self.assertRaises(ValueError, node.__setitem__, "alpha", "beta")
self.assertRaises(ValueError, node.update, {"alpha": "beta"})
@inlineCallbacks
def test_set_wo_write(self):
"""Check that get resolves from the internal write buffer.
set/get pairs w/o write should present a view of the state
reflecting local change. Verify that w/o write local data
appears on subsequent calls but that zk state hasn't been
changed.
"""
path = yield self.client.create(self.path)
node = YAMLState(self.client, path)
yield node.read()
options = dict(alpha="beta", one=1)
node.update(options)
self.assertEqual(node, options)
zk_data, stat = yield self.client.get(self.path)
# the node isn't created yet in zk
self.assertEqual(zk_data, "")
@inlineCallbacks
def test_set_w_write(self):
"""Verify that write updates the local and zk state.
When write is called we expect that zk state reflects this. We
also expect calls to get to expect the reflected state.
"""
node = YAMLState(self.client, self.path)
yield node.read()
options = dict(alpha="beta", one=1)
node.update(options)
changes = yield node.write()
self.assertEqual(
set(changes),
set([AddedItem(key='alpha', new='beta'),
AddedItem(key='one', new=1)]))
# a local get should reflect proper data
self.assertEqual(node, options)
# and a direct look at zk should work as well
zk_data, stat = yield self.client.get(self.path)
zk_data = yaml.load(zk_data)
self.assertEqual(zk_data, options)
@inlineCallbacks
def test_conflict_on_set(self):
"""Version conflict error tests.
Test that two YAMLState objects writing to the same path can
and will throw version errors when elements become out of
read.
"""
node = YAMLState(self.client, self.path)
node2 = YAMLState(self.client, self.path)
yield node.read()
yield node2.read()
options = dict(alpha="beta", one=1)
node.update(options)
yield node.write()
node2.update(options)
changes = yield node2.write()
self.assertEqual(
set(changes),
set([AddedItem("alpha", "beta"), AddedItem("one", 1)]))
# first read node2
self.assertEqual(node, options)
# write on node 1
options2 = dict(alpha="gamma", one="two")
node.update(options2)
changes = yield node.write()
self.assertEqual(
set(changes),
set([ModifiedItem("alpha", "beta", "gamma"),
ModifiedItem("one", 1, "two")]))
# verify that node 1 reports as expected
self.assertEqual(node, options2)
# verify that node2 has the older data still
self.assertEqual(node2, options)
# now issue a set/write from node2
# this will merge the data deleting 'one'
# and updating other values
options3 = dict(alpha="cappa", new="next")
node2.update(options3)
del node2["one"]
expected = dict(alpha="cappa", new="next")
changes = yield node2.write()
self.assertEqual(
set(changes),
set([DeletedItem("one", 1),
ModifiedItem("alpha", "beta", "cappa"),
AddedItem("new", "next")]))
self.assertEqual(expected, node2)
# but node still reflects the old data
self.assertEqual(node, options2)
@inlineCallbacks
def test_setitem(self):
node = YAMLState(self.client, self.path)
yield node.read()
options = dict(alpha="beta", one=1)
node["alpha"] = "beta"
node["one"] = 1
changes = yield node.write()
self.assertEqual(
set(changes),
set([AddedItem("alpha", "beta"),
AddedItem("one", 1)]))
# a local get should reflect proper data
self.assertEqual(node, options)
# and a direct look at zk should work as well
zk_data, stat = yield self.client.get(self.path)
zk_data = yaml.load(zk_data)
self.assertEqual(zk_data, options)
@inlineCallbacks
def test_multiple_reads(self):
"""Calling read resets state to ZK after multiple round-trips."""
node = YAMLState(self.client, self.path)
yield node.read()
node.update({"alpha": "beta", "foo": "bar"})
self.assertEqual(node["alpha"], "beta")
self.assertEqual(node["foo"], "bar")
yield node.read()
# A read resets the data to the empty state
self.assertEqual(node, {})
node.update({"alpha": "beta", "foo": "bar"})
changes = yield node.write()
self.assertEqual(
set(changes),
set([AddedItem("alpha", "beta"), AddedItem("foo", "bar")]))
# A write retains the newly set values
self.assertEqual(node["alpha"], "beta")
self.assertEqual(node["foo"], "bar")
# now get another state instance and change zk state
node2 = YAMLState(self.client, self.path)
yield node2.read()
node2.update({"foo": "different"})
changes = yield node2.write()
self.assertEqual(
changes, [ModifiedItem("foo", "bar", "different")])
# This should pull in the new state (and still have the merged old.
yield node.read()
self.assertEqual(node["alpha"], "beta")
self.assertEqual(node["foo"], "different")
def test_dictmixin_usage(self):
"""Verify that the majority of dict operation function."""
node = YAMLState(self.client, self.path)
yield node.read()
node.update({"alpha": "beta", "foo": "bar"})
self.assertEqual(node, {"alpha": "beta", "foo": "bar"})
result = node.pop("foo")
self.assertEqual(result, "bar")
self.assertEqual(node, {"alpha": "beta"})
node["delta"] = "gamma"
self.assertEqual(set(node.keys()), set(("alpha", "delta")))
result = list(node.iteritems())
self.assertIn(("alpha", "beta"), result)
self.assertIn(("delta", "gamma"), result)
@inlineCallbacks
def test_del_empties_state(self):
d = YAMLState(self.client, self.path)
yield d.read()
d["a"] = "foo"
changes = yield d.write()
self.assertEqual(changes, [AddedItem("a", "foo")])
del d["a"]
changes = yield d.write()
self.assertEqual(changes, [DeletedItem("a", "foo")])
self.assertEqual(d, {})
@inlineCallbacks
def test_read_resync(self):
d1 = YAMLState(self.client, self.path)
yield d1.read()
d1["a"] = "foo"
changes = yield d1.write()
self.assertEqual(changes, [AddedItem("a", "foo")])
d2 = YAMLState(self.client, self.path)
yield d2.read()
del d2["a"]
changes = yield d2.write()
self.assertEqual(changes, [DeletedItem("a", "foo")])
d2["a"] = "bar"
changes = yield d2.write()
self.assertEqual(changes, [AddedItem("a", "bar")])
zk_data, stat = yield self.client.get(self.path)
yield d1.read()
# d1 should pick up the new value (from d2) on a read
zk_data, stat = yield self.client.get(self.path)
self.assertEqual(d1["a"], "bar")
@inlineCallbacks
def test_multiple_writes(self):
d1 = YAMLState(self.client, self.path)
yield d1.read()
d1.update(dict(foo="bar", this="that"))
changes = yield d1.write()
self.assertEqual(
set(changes),
set([AddedItem("foo", "bar"), AddedItem("this", "that")]))
del d1["this"]
d1["another"] = "value"
changes = yield d1.write()
self.assertEqual(
set(changes),
set([DeletedItem("this", "that"), AddedItem("another", "value")]))
expected = {"foo": "bar", "another": "value"}
self.assertEqual(d1, expected)
changes = yield d1.write()
self.assertEqual(changes, [])
self.assertEqual(d1, expected)
yield d1.read()
self.assertEqual(d1, expected)
# This shouldn't write any changes
changes = yield d1.write()
self.assertEqual(changes, [])
self.assertEqual(d1, expected)
@inlineCallbacks
def test_write_twice(self):
d1 = YAMLState(self.client, self.path)
yield d1.read()
d1["a"] = "foo"
changes = yield d1.write()
self.assertEqual(changes, [AddedItem("a", "foo")])
d2 = YAMLState(self.client, self.path)
yield d2.read()
d2["a"] = "bar"
changes = yield d2.write()
self.assertEqual(changes, [ModifiedItem("a", "foo", "bar")])
# Shouldn't write again. Changes were already
# flushed and acted upon by other parties.
changes = yield d1.write()
self.assertEqual(changes, [])
yield d1.read()
self.assertEquals(d1, d2)
@inlineCallbacks
def test_read_requires_node(self):
"""Validate that read raises when required=True."""
d1 = YAMLState(self.client, self.path)
yield self.assertFailure(d1.read(True), StateNotFound)
