1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
"""Kazoo testing harnesses"""
import atexit
import logging
import os
import uuid
import threading
import unittest
from kazoo.client import KazooClient
from kazoo.exceptions import NotEmptyError
from kazoo.protocol.states import (
KazooState
)
from kazoo.testing.common import ZookeeperCluster
from kazoo.protocol.connection import _SESSION_EXPIRED
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))
assert ZK_HOME or ZK_CLASSPATH, (
"either ZOOKEEPER_PATH or ZOOKEEPER_CLASSPATH environment variable "
"must be defined.\n"
"For deb package installations this is /usr/share/java")
CLUSTER = ZookeeperCluster(
install_path=ZK_HOME,
classpath=ZK_CLASSPATH,
port_offset=ZK_PORT_OFFSET,
)
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):
return KazooClient(self.servers)
def _get_client(self, **kwargs):
kwargs['retry_max_delay'] = 2
kwargs['max_retries'] = 35
c = KazooClient(self.hosts, **kwargs)
try:
self._clients.append(c)
except AttributeError:
self._client = [c]
return c
def expire_session(self, client_id=None):
"""Force ZK to expire a client session
:param client_id: id of client to expire. If unspecified, the id of
self.client will be used.
"""
client_id = client_id or self.client.client_id
lost = threading.Event()
safe = threading.Event()
def watch_loss(state):
if state == KazooState.LOST:
lost.set()
if lost.is_set() and state == KazooState.CONNECTED:
safe.set()
return True
self.client.add_listener(watch_loss)
self.client._call(_SESSION_EXPIRED, None)
lost.wait(5)
if not lost.isSet():
raise Exception("Failed to get notified of session loss")
# Wait for the reconnect now
safe.wait(15)
if not safe.isSet():
raise Exception("Failed to see client reconnect")
self.client.retry(self.client.get_async, '/')
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.
"""
if not self.cluster[0].running:
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):
"""Clean up any ZNodes created during the test
"""
if not self.cluster[0].running:
self.cluster.start()
tries = 0
if self.client and self.client.connected:
while tries < 3:
try:
self.client.retry(self.client.delete, '/', recursive=True)
break
except NotEmptyError:
pass
tries += 1
self.client.stop()
self.client.close()
del self.client
else:
client = self._get_client()
client.start()
client.retry(client.delete, '/', recursive=True)
client.stop()
client.close()
del client
for client in self._clients:
client.stop()
del client
self._clients = None
class KazooTestCase(KazooTestHarness):
def setUp(self):
self.setup_zookeeper()
def tearDown(self):
self.teardown_zookeeper()
|
