First commit of Tooz
For now the project is composed of a simple API and
use ZooKeeper as the first backend.
Created files:
- tooz/api.py: the python public API and the abstract class
to implement for backends.
- tooz/drivers/zookeeper.py: the ZooKeeper backend using the
Kazoo client.
- tooz/exceptions.py: additional exception will be defined here.
- tooz/models.py: read only classes, for now the Member class.
- tooz/tests/test_api.py: Tooz will provide a unique unit-tests suite
which will be run against all backends (thanks to testscenarios).
Change-Id: I4e4cefb52cf6c39a3f6ba35ab1d4ef34a77b5811
This commit is contained in:
Yassine Lamgarchal
parent
9f065c444a
commit
db1708709f
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@ -0,0 +1,21 @@
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*.pyc
|
||||
*.dat
|
||||
TAGS
|
||||
*.egg-info
|
||||
build
|
||||
.coverage
|
||||
.tox
|
||||
cover
|
||||
.testrepository
|
||||
subunit.log
|
||||
AUTHORS
|
||||
ChangeLog
|
||||
*.deb
|
||||
dist
|
||||
*.egg
|
||||
tooz/versioninfo
|
||||
doc/source/api/tooz.*.rst
|
||||
doc/source/api/tests.*.rst
|
||||
doc/source/api/autoindex.rst
|
||||
doc/source/sourcecode
|
||||
*.mo
|
||||
|
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@ -0,0 +1,176 @@
|
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Apache License
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@ -0,0 +1,6 @@
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tooz
|
||||
====
|
||||
|
||||
The Tooz project aims to centralize the most common distributed primitives
|
||||
like group membership protocol, lock service and leader election by providing
|
||||
a coordination API helping developers to build distributed applications.
|
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|
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@ -0,0 +1,23 @@
|
|||
[metadata]
|
||||
name = tooz
|
||||
author = Tooz developers
|
||||
author-email = tooz-dev@lists.launchpad.net
|
||||
summary = Coordination library for distributed systems.
|
||||
description-file = README.rst
|
||||
license = Apache-2
|
||||
classifier =
|
||||
Environment :: OpenStack
|
||||
Intended Audience :: Developers
|
||||
Intended Audience :: Information Technology
|
||||
License :: OSI Approved :: Apache Software License
|
||||
Operating System :: POSIX :: Linux
|
||||
Programming Language :: Python
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||||
Topic :: System :: Distributed Computing
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||||
|
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[files]
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||||
packages =
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tooz
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|
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[entry_points]
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||||
tooz.backends =
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zookeeper = tooz.drivers.zookeeper:ZooKeeperDriver
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@ -0,0 +1,24 @@
|
|||
#!/usr/bin/env python
|
||||
# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
|
||||
#
|
||||
# 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.
|
||||
|
||||
# THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
|
||||
|
||||
import setuptools
|
||||
|
||||
|
||||
setuptools.setup(
|
||||
setup_requires=['pbr'],
|
||||
pbr=True)
|
||||
|
|
@ -0,0 +1,163 @@
|
|||
# -*- coding: utf-8 -*-
|
||||
|
||||
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
||||
|
||||
# Copyright (C) 2013 eNovance 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.
|
||||
|
||||
import abc
|
||||
import six
|
||||
|
||||
from stevedore import driver
|
||||
|
||||
TOOZ_BACKENDS_NAMESPACE = "tooz.backends"
|
||||
|
||||
|
||||
@six.add_metaclass(abc.ABCMeta)
|
||||
class CoordinationDriver(object):
|
||||
|
||||
@abc.abstractmethod
|
||||
def start(self):
|
||||
"""Start the service engine.
|
||||
|
||||
If needed, the establishment of a connection to the servers
|
||||
is initiated.
|
||||
"""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def stop(self):
|
||||
"""Stop the service engine.
|
||||
|
||||
If needed, the connection to servers is closed and the client will
|
||||
disappear from all joined groups.
|
||||
"""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def create_group(self, group_id):
|
||||
"""Request the creation of a group.
|
||||
|
||||
:param group_id: the id of the group to create
|
||||
:type group_id: str
|
||||
"""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def get_all_groups_ids(self):
|
||||
"""Return the list composed by all created groups ids."""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def join_group(self, group_id, capabilities):
|
||||
"""Join a group and establish group membership.
|
||||
|
||||
:param group_id: the id of the group to join
|
||||
:type group_id: str
|
||||
:param capabilities: the capabilities of the joined member
|
||||
:type capabilities: str
|
||||
"""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def leave_group(self, group_id):
|
||||
"""Leave a group.
|
||||
|
||||
:param group_id: the id of the group to leave
|
||||
:type group_id: str
|
||||
"""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def get_members(self):
|
||||
"""Return the list of all members of the specified group."""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def get_member_capabilities(self, group_id, member_id):
|
||||
"""Return the capabilities of a member.
|
||||
|
||||
:param group_id: the id of the group of the member
|
||||
:type group_id: str
|
||||
:param member_id: the id of the member
|
||||
:type member_id: str
|
||||
"""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def update_capabilities(self, group_id, capabilities):
|
||||
"""Update capabilities of the caller in the specified group.
|
||||
|
||||
:param group_id: the id of the group of the current member
|
||||
:type group_id: str
|
||||
:param capabilities: the capabilities of the updated member
|
||||
:type capabilities: str
|
||||
"""
|
||||
pass
|
||||
|
||||
|
||||
class Coordinator(CoordinationDriver):
|
||||
|
||||
#TODO(yassine)
|
||||
#Replace kwargs by something more simple.
|
||||
def __init__(self, backend, member_id, kwargs):
|
||||
"""Initialize and load the backend.
|
||||
|
||||
:param backend: the current tooz provided backends are 'zookeeper'
|
||||
:param member_id: the id of the member
|
||||
:param kwargs: additional backend specific options
|
||||
"""
|
||||
mgr = driver.DriverManager(namespace=TOOZ_BACKENDS_NAMESPACE,
|
||||
name=backend,
|
||||
invoke_on_load=True,
|
||||
invoke_args=(member_id,),
|
||||
invoke_kwds=kwargs)
|
||||
self._driver = mgr.driver
|
||||
|
||||
def start(self):
|
||||
self._driver.start()
|
||||
|
||||
def stop(self):
|
||||
self._driver.stop()
|
||||
|
||||
def create_group(self, group_id):
|
||||
self._driver.create_group(group_id)
|
||||
|
||||
def get_all_groups_ids(self):
|
||||
return self._driver.get_all_groups_ids()
|
||||
|
||||
def join_group(self, group_id, capabilities=""):
|
||||
self._driver.join_group(group_id, capabilities)
|
||||
|
||||
def leave_group(self, group_id):
|
||||
self._driver.leave_group(group_id)
|
||||
|
||||
def get_members(self, group_id):
|
||||
return self._driver.get_members(group_id)
|
||||
|
||||
#TODO(yassine)
|
||||
#set default value of member_id to the current member
|
||||
def get_member_capabilities(self, group_id, member_id):
|
||||
return self._driver.get_member_capabilities(group_id, member_id)
|
||||
|
||||
def update_capabilities(self, group_id, capabilities):
|
||||
self._driver.update_capabilities(group_id, capabilities)
|
||||
|
||||
|
||||
class InvalidGroup(Exception):
|
||||
pass
|
||||
|
||||
|
||||
class GroupAlreadyExist(Exception):
|
||||
pass
|
||||
|
|
@ -0,0 +1,86 @@
|
|||
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
||||
|
||||
# Copyright (C) 2013 eNovance 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 kazoo import client
|
||||
from kazoo import exceptions
|
||||
from kazoo.protocol import paths
|
||||
|
||||
from tooz import api
|
||||
from tooz import models
|
||||
|
||||
_TOOZ_NAMESPACE = "tooz"
|
||||
|
||||
|
||||
class ZooKeeperDriver(api.CoordinationDriver):
|
||||
|
||||
def __init__(self, member_id, **kwargs):
|
||||
""":param kwargs: it must contains the key "hosts" associated
|
||||
to the list of zookeeper servers in the form "ip:port2, ip2:port2".
|
||||
"""
|
||||
if not all(kwargs["hosts"] and member_id):
|
||||
raise KeyError("hosts=%r, member_id=%r" % (kwargs["hosts"],
|
||||
member_id))
|
||||
self._member_id = member_id
|
||||
self._coord = client.KazooClient(hosts=kwargs["hosts"])
|
||||
super(ZooKeeperDriver, self).__init__()
|
||||
|
||||
def start(self):
|
||||
self._coord.start()
|
||||
self._coord.ensure_path("/%s" % _TOOZ_NAMESPACE)
|
||||
|
||||
def stop(self):
|
||||
self._coord.stop()
|
||||
|
||||
def create_group(self, group_id):
|
||||
try:
|
||||
self._coord.create("/%s/%s" % (_TOOZ_NAMESPACE, group_id))
|
||||
except exceptions.NodeExistsError:
|
||||
raise api.GroupAlreadyExist("group_id=%s" % group_id)
|
||||
|
||||
def join_group(self, group_id, capabilities=""):
|
||||
self._coord.create(self._path_member(group_id, self._member_id),
|
||||
value=capabilities, ephemeral=True)
|
||||
|
||||
def leave_group(self, group_id):
|
||||
self._coord.delete(self._path_member(group_id, self._member_id))
|
||||
|
||||
def get_members(self, group_id):
|
||||
members = []
|
||||
member_ids = self._coord.get_children("/%s/%s" % (_TOOZ_NAMESPACE,
|
||||
group_id))
|
||||
for member_id in member_ids:
|
||||
capabilities = self._coord.get(self._path_member(group_id,
|
||||
member_id))
|
||||
members.append(models.Member(group_id, member_id, capabilities[0]))
|
||||
|
||||
return members
|
||||
|
||||
def get_member(self, group_id, member_id):
|
||||
capabilities = self._coord.get(self._path_member(group_id, member_id))
|
||||
return models.Member(group_id, member_id, capabilities)
|
||||
|
||||
def update_capabilities(self, group_id, capabilities):
|
||||
self._coord.set(self._path_member(group_id, self._member_id),
|
||||
capabilities)
|
||||
|
||||
def get_member_capabilities(self, group_id, member_id):
|
||||
return self._coord.get(self._path_member(group_id, member_id))[0]
|
||||
|
||||
def get_all_groups_ids(self):
|
||||
return self._coord.get_children("/%s" % _TOOZ_NAMESPACE)
|
||||
|
||||
def _path_member(self, group_id, member_id):
|
||||
return paths.join("/", _TOOZ_NAMESPACE, group_id, member_id)
|
||||
|
|
@ -0,0 +1,32 @@
|
|||
# -*- coding: utf-8 -*-
|
||||
|
||||
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
||||
|
||||
# Copyright (C) 2013 eNovance 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.
|
||||
|
||||
|
||||
class Member(object):
|
||||
"""The member of a group.
|
||||
|
||||
A member is composed of a member identifier, a group identifier and
|
||||
capabilities. The capabilities correspond to a bytes string defined by
|
||||
the user of the API, for instance it could be resulting from JSON
|
||||
serialization, Google Protocol Buffers, MsgPack and so on.
|
||||
"""
|
||||
|
||||
def __init__(self, group_id, member_id, capabilities):
|
||||
self.group_id = group_id
|
||||
self.member_id = member_id
|
||||
self.capabilities = capabilities
|
||||
|
|
@ -0,0 +1,112 @@
|
|||
# -*- coding: utf-8 -*-
|
||||
|
||||
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
||||
|
||||
# Copyright (C) 2013 eNovance 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.
|
||||
|
||||
|
||||
import testscenarios
|
||||
import uuid
|
||||
|
||||
import tooz.api
|
||||
|
||||
zookeeper_tests = ('zookeeper_tests', {'backend': 'zookeeper',
|
||||
'kwargs': {'hosts': '127.0.0.1:2181'}})
|
||||
|
||||
|
||||
class TestAPI(testscenarios.TestWithScenarios):
|
||||
|
||||
scenarios = [zookeeper_tests]
|
||||
|
||||
def setUp(self):
|
||||
self.group_id = self._get_random_uuid()
|
||||
self.member_id = self._get_random_uuid()
|
||||
self._coord = tooz.api.Coordinator(self.backend, self.member_id,
|
||||
self.kwargs)
|
||||
self._coord.start()
|
||||
|
||||
def tearDown(self):
|
||||
self._coord.stop()
|
||||
|
||||
def test_create_group(self):
|
||||
self._coord.create_group(self.group_id)
|
||||
all_group_ids = self._coord.get_all_groups_ids()
|
||||
self.assertIn(self.group_id, all_group_ids)
|
||||
|
||||
def test_get_all_groups_ids(self):
|
||||
groups_ids = [self._get_random_uuid() for _ in xrange(0, 5)]
|
||||
for group_id in groups_ids:
|
||||
self._coord.create_group(group_id)
|
||||
created_groups = self._coord.get_all_groups_ids()
|
||||
for group_id in groups_ids:
|
||||
self.assertIn(group_id, created_groups)
|
||||
|
||||
def test_join_group(self):
|
||||
self._coord.create_group(self.group_id)
|
||||
self._coord.join_group(self.group_id)
|
||||
member_objects = self._coord.get_members(self.group_id)
|
||||
member_list = [member.member_id for member in member_objects]
|
||||
self.assertIn(self.member_id, member_list)
|
||||
|
||||
def test_leave_group(self):
|
||||
self._coord.create_group(self.group_id)
|
||||
self._coord.join_group(self.group_id)
|
||||
member_objects = self._coord.get_members(self.group_id)
|
||||
member_ids = [member.member_id for member in member_objects]
|
||||
self.assertIn(self.member_id, member_ids)
|
||||
self._coord.leave_group(self.group_id)
|
||||
new_member_objects = self._coord.get_members(self.group_id)
|
||||
new_member_list = [member.member_id for member in new_member_objects]
|
||||
self.assertNotIn(self.member_id, new_member_list)
|
||||
|
||||
def test_get_members(self):
|
||||
group_id_test2 = self._get_random_uuid()
|
||||
member_id_test2 = self._get_random_uuid()
|
||||
client2 = tooz.api.Coordinator(self.backend, member_id_test2,
|
||||
self.kwargs)
|
||||
client2.start()
|
||||
|
||||
self._coord.create_group(group_id_test2)
|
||||
self._coord.join_group(group_id_test2)
|
||||
client2.join_group(group_id_test2)
|
||||
members_objects = self._coord.get_members(group_id_test2)
|
||||
members_ids = [member.member_id for member in members_objects]
|
||||
self.assertIn(self.member_id, members_ids)
|
||||
self.assertIn(member_id_test2, members_ids)
|
||||
|
||||
def test_get_member_capabilities(self):
|
||||
self._coord.create_group(self.group_id)
|
||||
self._coord.join_group(self.group_id, "test_capabilities")
|
||||
|
||||
capa = self._coord.get_member_capabilities(self.group_id,
|
||||
self.member_id)
|
||||
self.assertEqual(capa, "test_capabilities")
|
||||
|
||||
def test_update_capabilities(self):
|
||||
self._coord.create_group(self.group_id)
|
||||
self._coord.join_group(self.group_id, "test_capabilities1")
|
||||
|
||||
capa = self._coord.get_member_capabilities(self.group_id,
|
||||
self.member_id)
|
||||
self.assertEqual(capa, "test_capabilities1")
|
||||
self._coord.update_capabilities(self.group_id,
|
||||
"test_capabilities2")
|
||||
|
||||
capa2 = self._coord.get_member_capabilities(self.group_id,
|
||||
self.member_id)
|
||||
self.assertEqual(capa2, "test_capabilities2")
|
||||
|
||||
def _get_random_uuid(self):
|
||||
return str(uuid.uuid4())
|
||||
Loading…
Reference in New Issue