Move Zake driver code to separated Python module

That is needed to prevent Zake driver load in real-life Zookeeper
usage - currently we had the situation when even if you want to use
just KaZoo, you needed to install partially test-requierements
(zake package).

Change-Id: I9664fda2d6e76a6e48776b4a6d92af4c4baf1425

setup.cfg

@@ -25,7 +25,7 @@ packages =
 [entry_points]
 tooz.backends =
     kazoo = tooz.drivers.zookeeper:KazooDriver
-    zake = tooz.drivers.zookeeper:ZakeDriver
+    zake = tooz.drivers.zake:ZakeDriver
     memcached = tooz.drivers.memcached:MemcachedDriver
     ipc = tooz.drivers.ipc:IPCDriver
 

tooz/drivers/zake.py

@@ -0,0 +1,62 @@
+# Copyright (c) 2013-2014 Mirantis Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from __future__ import absolute_import
+
+from zake import fake_client
+from zake import fake_storage
+
+from tooz.drivers import zookeeper
+
+
+class ZakeDriver(zookeeper.BaseZooKeeperDriver):
+    """The driver using the Zake client which mimic a fake Kazoo client
+    without the need of real ZooKeeper servers.
+    """
+
+    # here we need to pass *threading handler* as an argument
+    fake_storage = fake_storage.FakeStorage(
+        fake_client.k_threading.SequentialThreadingHandler())
+
+    def __init__(self, member_id, parsed_url, options):
+        super(ZakeDriver, self).__init__(member_id, parsed_url, options)
+        self._coord = fake_client.FakeClient(storage=self.fake_storage)
+
+    @staticmethod
+    def watch_join_group(group_id, callback):
+        raise NotImplementedError
+
+    @staticmethod
+    def unwatch_join_group(group_id, callback):
+        raise NotImplementedError
+
+    @staticmethod
+    def watch_leave_group(group_id, callback):
+        raise NotImplementedError
+
+    @staticmethod
+    def unwatch_leave_group(group_id, callback):
+        raise NotImplementedError
+
+    @staticmethod
+    def watch_elected_as_leader(group_id, callback):
+        raise NotImplementedError
+
+    @staticmethod
+    def unwatch_elected_as_leader(group_id, callback):
+        raise NotImplementedError
+
+    @staticmethod
+    def run_watchers():
+        raise NotImplementedError

tooz/drivers/zookeeper.py

@@ -21,8 +21,6 @@ from kazoo import client
 from kazoo import exceptions
 from kazoo.protocol import paths
 import six
-import zake.fake_client
-import zake.fake_storage
 
 from tooz import coordination
 from tooz import locking
@@ -352,47 +350,6 @@ class KazooDriver(BaseZooKeeperDriver):
         return ret
 
 
-class ZakeDriver(BaseZooKeeperDriver):
-    """The driver using the Zake client which mimic a fake Kazoo client
-    without the need of real ZooKeeper servers.
-    """
-
-    fake_storage = zake.fake_storage.FakeStorage(
-        zake.fake_client.k_threading.SequentialThreadingHandler())
-
-    def __init__(self, member_id, parsed_url, options):
-        super(ZakeDriver, self).__init__(member_id, parsed_url, options)
-        self._coord = zake.fake_client.FakeClient(storage=self.fake_storage)
-
-    @staticmethod
-    def watch_join_group(group_id, callback):
-        raise NotImplementedError
-
-    @staticmethod
-    def unwatch_join_group(group_id, callback):
-        raise NotImplementedError
-
-    @staticmethod
-    def watch_leave_group(group_id, callback):
-        raise NotImplementedError
-
-    @staticmethod
-    def unwatch_leave_group(group_id, callback):
-        raise NotImplementedError
-
-    @staticmethod
-    def watch_elected_as_leader(group_id, callback):
-        raise NotImplementedError
-
-    @staticmethod
-    def unwatch_elected_as_leader(group_id, callback):
-        raise NotImplementedError
-
-    @staticmethod
-    def run_watchers():
-        raise NotImplementedError
-
-
 class ZooAsyncResult(coordination.CoordAsyncResult):
 
     def __init__(self, kazooAsyncResult, handler, **kwargs):