本文主要講python支持zookeeper的接口庫(kù)安裝和使用。zk的python接口庫(kù)有zkpython，還有kazoo，下面是zkpython，是基于zk的C庫(kù)的python接口。
zkpython安裝
前提是zookeeper安裝包已經(jīng)在/usr/local/zookeeper下
|
1
2
3
4
5
6
7
8
9
|
cd /usr/local/zookeeper/src/c./configuremakemake installwget --no-check-certificate http://pypi.python.org/packages/source/z/zkpython/zkpython-0.4.tar.gztar -zxvf zkpython-0.4.tar.gzcd zkpython-0.4sudo python setup.py install |
zkpython應(yīng)用
下面是網(wǎng)上一個(gè)zkpython的類(lèi)，用的時(shí)候只要import進(jìn)去就行
vim zkclient.py
|
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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
#!/usr/bin/env python2.7# -*- coding: UTF-8 -*-import zookeeper, time, threadingfrom collections import namedtupleDEFAULT_TIMEOUT = 30000VERBOSE = TrueZOO_OPEN_ACL_UNSAFE = {"perms":0x1f, "scheme":"world", "id" :"anyone"}# Mapping of connection state values to human strings.STATE_NAME_MAPPING = { zookeeper.ASSOCIATING_STATE: "associating", zookeeper.AUTH_FAILED_STATE: "auth-failed", zookeeper.CONNECTED_STATE: "connected", zookeeper.CONNECTING_STATE: "connecting", zookeeper.EXPIRED_SESSION_STATE: "expired",}# Mapping of event type to human string.TYPE_NAME_MAPPING = { zookeeper.NOTWATCHING_EVENT: "not-watching", zookeeper.SESSION_EVENT: "session", zookeeper.CREATED_EVENT: "created", zookeeper.DELETED_EVENT: "deleted", zookeeper.CHANGED_EVENT: "changed", zookeeper.CHILD_EVENT: "child", }class ZKClientError(Exception): def __init__(self, value): self.value = value def __str__(self): return repr(self.value)class ClientEvent(namedtuple("ClientEvent", 'type, connection_state, path')): """ A client event is returned when a watch deferred fires. It denotes some event on the zookeeper client that the watch was requested on. """ @property def type_name(self): return TYPE_NAME_MAPPING[self.type] @property def state_name(self): return STATE_NAME_MAPPING[self.connection_state] def __repr__(self): return "<ClientEvent %s at %r state: %s>" % ( self.type_name, self.path, self.state_name)def watchmethod(func): def decorated(handle, atype, state, path): event = ClientEvent(atype, state, path) return func(event) return decoratedclass ZKClient(object): def __init__(self, servers, timeout=DEFAULT_TIMEOUT): self.timeout = timeout self.connected = False self.conn_cv = threading.Condition( ) self.handle = -1 self.conn_cv.acquire() if VERBOSE: print("Connecting to %s" % (servers)) start = time.time() self.handle = zookeeper.init(servers, self.connection_watcher, timeout) self.conn_cv.wait(timeout/1000) self.conn_cv.release() if not self.connected: raise ZKClientError("Unable to connect to %s" % (servers)) if VERBOSE: print("Connected in %d ms, handle is %d" % (int((time.time() - start) * 1000), self.handle)) def connection_watcher(self, h, type, state, path): self.handle = h self.conn_cv.acquire() self.connected = True self.conn_cv.notifyAll() self.conn_cv.release() def close(self): return zookeeper.close(self.handle) def create(self, path, data="", flags=0, acl=[ZOO_OPEN_ACL_UNSAFE]): start = time.time() result = zookeeper.create(self.handle, path, data, acl, flags) if VERBOSE: print("Node %s created in %d ms" % (path, int((time.time() - start) * 1000))) return result def delete(self, path, version=-1): start = time.time() result = zookeeper.delete(self.handle, path, version) if VERBOSE: print("Node %s deleted in %d ms" % (path, int((time.time() - start) * 1000))) return result def get(self, path, watcher=None): return zookeeper.get(self.handle, path, watcher) def exists(self, path, watcher=None): return zookeeper.exists(self.handle, path, watcher) def set(self, path, data="", version=-1): return zookeeper.set(self.handle, path, data, version) def set2(self, path, data="", version=-1): return zookeeper.set2(self.handle, path, data, version) def get_children(self, path, watcher=None): return zookeeper.get_children(self.handle, path, watcher) def async(self, path = "/"): return zookeeper.async(self.handle, path) def acreate(self, path, callback, data="", flags=0, acl=[ZOO_OPEN_ACL_UNSAFE]): result = zookeeper.acreate(self.handle, path, data, acl, flags, callback) return result def adelete(self, path, callback, version=-1): return zookeeper.adelete(self.handle, path, version, callback) def aget(self, path, callback, watcher=None): return zookeeper.aget(self.handle, path, watcher, callback) def aexists(self, path, callback, watcher=None): return zookeeper.aexists(self.handle, path, watcher, callback) def aset(self, path, callback, data="", version=-1): return zookeeper.aset(self.handle, path, data, version, callback)watch_count = 0"""Callable watcher that counts the number of notifications"""class CountingWatcher(object): def __init__(self): self.count = 0 global watch_count self.id = watch_count watch_count += 1 def waitForExpected(self, count, maxwait): """Wait up to maxwait for the specified count, return the count whether or not maxwait reached. Arguments: - `count`: expected count - `maxwait`: max milliseconds to wait """ waited = 0 while (waited < maxwait): if self.count >= count: return self.count time.sleep(1.0); waited += 1000 return self.count def __call__(self, handle, typ, state, path): self.count += 1 if VERBOSE: print("handle %d got watch for %s in watcher %d, count %d" % (handle, path, self.id, self.count))"""Callable watcher that counts the number of notificationsand verifies that the paths are sequential"""class SequentialCountingWatcher(CountingWatcher): def __init__(self, child_path): CountingWatcher.__init__(self) self.child_path = child_path def __call__(self, handle, typ, state, path): if not self.child_path(self.count) == path: raise ZKClientError("handle %d invalid path order %s" % (handle, path)) CountingWatcher.__call__(self, handle, typ, state, path)class Callback(object): def __init__(self): self.cv = threading.Condition() self.callback_flag = False self.rc = -1 def callback(self, handle, rc, handler): self.cv.acquire() self.callback_flag = True self.handle = handle self.rc = rc handler() self.cv.notify() self.cv.release() def waitForSuccess(self): while not self.callback_flag: self.cv.wait() self.cv.release() if not self.callback_flag == True: raise ZKClientError("asynchronous operation timed out on handle %d" % (self.handle)) if not self.rc == zookeeper.OK: raise ZKClientError( "asynchronous operation failed on handle %d with rc %d" % (self.handle, self.rc))class GetCallback(Callback): def __init__(self): Callback.__init__(self) def __call__(self, handle, rc, value, stat): def handler(): self.value = value self.stat = stat self.callback(handle, rc, handler)class SetCallback(Callback): def __init__(self): Callback.__init__(self) def __call__(self, handle, rc, stat): def handler(): self.stat = stat self.callback(handle, rc, handler)class ExistsCallback(SetCallback): passclass CreateCallback(Callback): def __init__(self): Callback.__init__(self) def __call__(self, handle, rc, path): def handler(): self.path = path self.callback(handle, rc, handler)class DeleteCallback(Callback): def __init__(self): Callback.__init__(self) def __call__(self, handle, rc): def handler(): pass self.callback(handle, rc, handler) |
總結(jié)
以上就是本文關(guān)于zookeeper python接口實(shí)例詳解的全部?jī)?nèi)容，希望對(duì)大家有所幫助。感興趣的朋友可以繼續(xù)參閱本站其他相關(guān)專(zhuān)題，如有不足之處，歡迎留言指出。感謝朋友們對(duì)本站的支持！
原文鏈接：http://blog.csdn.net/swpihchj/article/details/24603641
