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")
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
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")
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
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)