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"""Kazoo testing harnesses"""
import logging
import os
import uuid
import unittest
from kazoo import python2atexit as atexit
from kazoo.client import KazooClient
from kazoo.exceptions import KazooException
from kazoo.protocol.connection import _CONNECTION_DROP, _SESSION_EXPIRED
from kazoo.protocol.states import (
KazooState
)
from kazoo.testing.common import ZookeeperCluster
log = logging.getLogger(__name__)
CLUSTER = None
def get_global_cluster():
global CLUSTER
if CLUSTER is None:
ZK_HOME = os.environ.get("ZOOKEEPER_PATH")
ZK_CLASSPATH = os.environ.get("ZOOKEEPER_CLASSPATH")
ZK_PORT_OFFSET = int(os.environ.get("ZOOKEEPER_PORT_OFFSET", 20000))
ZK_CLUSTER_SIZE = int(os.environ.get("ZOOKEEPER_CLUSTER_SIZE", 3))
ZK_VERSION = os.environ.get("ZOOKEEPER_VERSION")
if '-' in ZK_VERSION:
# Ignore pre-release markers like -alpha
ZK_VERSION = ZK_VERSION.split('-')[0]
ZK_VERSION = tuple([int(n) for n in ZK_VERSION.split('.')])
ZK_OBSERVER_START_ID = int(
os.environ.get("ZOOKEEPER_OBSERVER_START_ID", -1))
assert ZK_HOME or ZK_CLASSPATH or ZK_VERSION, (
"Either ZOOKEEPER_PATH or ZOOKEEPER_CLASSPATH or "
"ZOOKEEPER_VERSION environment variable must be defined.\n"
"For deb package installations this is /usr/share/java")
if ZK_VERSION >= (3, 5):
additional_configuration_entries = [
"4lw.commands.whitelist=*",
"reconfigEnabled=true"
]
# If defines, this sets the superuser password to "test"
additional_java_system_properties = [
"-Dzookeeper.DigestAuthenticationProvider.superDigest="
"super:D/InIHSb7yEEbrWz8b9l71RjZJU="
]
else:
additional_configuration_entries = []
additional_java_system_properties = []
CLUSTER = ZookeeperCluster(
install_path=ZK_HOME,
classpath=ZK_CLASSPATH,
port_offset=ZK_PORT_OFFSET,
size=ZK_CLUSTER_SIZE,
observer_start_id=ZK_OBSERVER_START_ID,
configuration_entries=additional_configuration_entries,
java_system_properties=additional_java_system_properties
)
atexit.register(lambda cluster: cluster.terminate(), CLUSTER)
return CLUSTER
class KazooTestHarness(unittest.TestCase):
"""Harness for testing code that uses Kazoo
This object can be used directly or as a mixin. It supports starting
and stopping a complete ZooKeeper cluster locally and provides an
API for simulating errors and expiring sessions.
Example::
class MyTestCase(KazooTestHarness):
def setUp(self):
self.setup_zookeeper()
# additional test setup
def tearDown(self):
self.teardown_zookeeper()
def test_something(self):
something_that_needs_a_kazoo_client(self.client)
def test_something_else(self):
something_that_needs_zk_servers(self.servers)
"""
def __init__(self, *args, **kw):
super(KazooTestHarness, self).__init__(*args, **kw)
self.client = None
self._clients = []
@property
def cluster(self):
return get_global_cluster()
@property
def servers(self):
return ",".join([s.address for s in self.cluster])
def _get_nonchroot_client(self):
c = KazooClient(self.servers)
self._clients.append(c)
return c
def _get_client(self, **kwargs):
c = KazooClient(self.hosts, **kwargs)
self._clients.append(c)
return c
def lose_connection(self, event_factory):
"""Force client to lose connection with server"""
self.__break_connection(_CONNECTION_DROP, KazooState.SUSPENDED,
event_factory)
def expire_session(self, event_factory):
"""Force ZK to expire a client session"""
self.__break_connection(_SESSION_EXPIRED, KazooState.LOST,
event_factory)
def setup_zookeeper(self, **client_options):
"""Create a ZK cluster and chrooted :class:`KazooClient`
The cluster will only be created on the first invocation and won't be
fully torn down until exit.
"""
do_start = False
for s in self.cluster:
if not s.running:
do_start = True
if do_start:
self.cluster.start()
namespace = "/kazootests" + uuid.uuid4().hex
self.hosts = self.servers + namespace
if 'timeout' not in client_options:
client_options['timeout'] = 0.8
self.client = self._get_client(**client_options)
self.client.start()
self.client.ensure_path("/")
def teardown_zookeeper(self):
"""Reset and cleanup the zookeeper cluster that was started."""
while self._clients:
c = self._clients.pop()
try:
c.stop()
except KazooException:
log.exception("Failed stopping client %s", c)
finally:
c.close()
self.client = None
def __break_connection(self, break_event, expected_state, event_factory):
"""Break ZooKeeper connection using the specified event."""
lost = event_factory()
safe = event_factory()
def watch_loss(state):
if state == expected_state:
lost.set()
elif lost.is_set() and state == KazooState.CONNECTED:
safe.set()
return True
self.client.add_listener(watch_loss)
self.client._call(break_event, None)
lost.wait(5)
if not lost.isSet():
raise Exception("Failed to get notified of broken connection.")
safe.wait(15)
if not safe.isSet():
raise Exception("Failed to see client reconnect.")
self.client.retry(self.client.get_async, '/')
class KazooTestCase(KazooTestHarness):
def setUp(self):
self.setup_zookeeper()
def tearDown(self):
self.teardown_zookeeper()
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