mirror of
https://github.com/thegeeklab/ansible-later.git
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254 lines
7.4 KiB
Python
254 lines
7.4 KiB
Python
#!/usr/bin/python
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# Copyright 2015 WP Engine, Inc. All rights reserved.
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import absolute_import, division, print_function
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__metaclass__ = type
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ANSIBLE_METADATA = {'metadata_version': '1.1',
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'status': ['preview'],
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'supported_by': 'community'}
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DOCUMENTATION = """
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---
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module: znode
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version_added: "2.0"
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short_description: Create, delete, retrieve, and update znodes using ZooKeeper
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description:
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- Create, delete, retrieve, and update znodes using ZooKeeper.
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options:
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hosts:
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description:
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- A list of ZooKeeper servers (format '[server]:[port]').
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required: true
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name:
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description:
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- The path of the znode.
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required: true
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value:
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description:
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- The value assigned to the znode.
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op:
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description:
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- An operation to perform. Mutually exclusive with state.
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state:
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description:
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- The state to enforce. Mutually exclusive with op.
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timeout:
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description:
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- The amount of time to wait for a node to appear.
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default: 300
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recursive:
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description:
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- Recursively delete node and all its children.
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type: bool
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default: 'no'
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version_added: "2.1"
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requirements:
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- kazoo >= 2.1
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- python >= 2.6
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author: "Trey Perry (@treyperry)"
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"""
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EXAMPLES = """
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# Creating or updating a znode with a given value
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- znode:
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hosts: 'localhost:2181'
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name: /mypath
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value: myvalue
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state: present
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# Getting the value and stat structure for a znode
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- znode:
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hosts: 'localhost:2181'
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name: /mypath
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op: get
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# Listing a particular znode's children
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- znode:
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hosts: 'localhost:2181'
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name: /zookeeper
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op: list
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# Waiting 20 seconds for a znode to appear at path /mypath
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- znode:
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hosts: 'localhost:2181'
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name: /mypath
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op: wait
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timeout: 20
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# Deleting a znode at path /mypath
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- znode:
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hosts: 'localhost:2181'
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name: /mypath
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state: absent
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# Creating or updating a znode with a given value on a remote Zookeeper
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- znode:
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hosts: 'my-zookeeper-node:2181'
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name: /mypath
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value: myvalue
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state: present
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delegate_to: 127.0.0.1
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"""
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import time
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try:
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from kazoo.client import KazooClient
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from kazoo.handlers.threading import KazooTimeoutError
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KAZOO_INSTALLED = True
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except ImportError:
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KAZOO_INSTALLED = False
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from ansible.module_utils.basic import AnsibleModule
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from ansible.module_utils._text import to_bytes
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def main():
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module = AnsibleModule(
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argument_spec=dict(
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hosts=dict(required=True, type='str'),
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name=dict(required=True, type='str'),
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value=dict(required=False, default=None, type='str'),
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op=dict(required=False, default=None, choices=['get', 'wait', 'list']),
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state=dict(choices=['present', 'absent']),
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timeout=dict(required=False, default=300, type='int'),
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recursive=dict(required=False, default=False, type='bool')
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),
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supports_check_mode=False
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)
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if not KAZOO_INSTALLED:
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module.fail_json(msg='kazoo >= 2.1 is required to use this module. Use pip to install it.')
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check = check_params(module.params)
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if not check['success']:
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module.fail_json(msg=check['msg'])
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zoo = KazooCommandProxy(module)
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try:
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zoo.start()
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except KazooTimeoutError:
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module.fail_json(msg='The connection to the ZooKeeper ensemble timed out.')
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command_dict = {
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'op': {
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'get': zoo.get,
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'list': zoo.list,
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'wait': zoo.wait
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},
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'state': {
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'present': zoo.present,
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'absent': zoo.absent
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}
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}
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command_type = 'op' if 'op' in module.params and module.params['op'] is not None else 'state'
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method = module.params[command_type]
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result, result_dict = command_dict[command_type][method]()
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zoo.shutdown()
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if result:
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module.exit_json(**result_dict)
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else:
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module.fail_json(**result_dict)
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def check_params(params):
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if not params['state'] and not params['op']:
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return {'success': False, 'msg': 'Please define an operation (op) or a state.'}
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if params['state'] and params['op']:
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return {'success': False, 'msg': 'Please choose an operation (op) or a state, but not both.'}
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return {'success': True}
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class KazooCommandProxy():
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def __init__(self, module):
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self.module = module
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self.zk = KazooClient(module.params['hosts'])
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def absent(self):
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return self._absent(self.module.params['name'])
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def exists(self, znode):
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return self.zk.exists(znode)
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def list(self):
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children = self.zk.get_children(self.module.params['name'])
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return True, {'count': len(children), 'items': children, 'msg': 'Retrieved znodes in path.',
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'znode': self.module.params['name']}
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def present(self):
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return self._present(self.module.params['name'], self.module.params['value'])
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def get(self):
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return self._get(self.module.params['name'])
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def shutdown(self):
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self.zk.stop()
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self.zk.close()
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def start(self):
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self.zk.start()
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def wait(self):
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return self._wait(self.module.params['name'], self.module.params['timeout'])
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def _absent(self, znode):
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if self.exists(znode):
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self.zk.delete(znode, recursive=self.module.params['recursive'])
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return True, {'changed': True, 'msg': 'The znode was deleted.'}
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else:
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return True, {'changed': False, 'msg': 'The znode does not exist.'}
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def _get(self, path):
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if self.exists(path):
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value, zstat = self.zk.get(path)
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stat_dict = {}
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for i in dir(zstat):
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if not i.startswith('_'):
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attr = getattr(zstat, i)
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if isinstance(attr, (int, str)):
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stat_dict[i] = attr
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result = True, {'msg': 'The node was retrieved.', 'znode': path, 'value': value,
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'stat': stat_dict}
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else:
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result = False, {'msg': 'The requested node does not exist.'}
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return result
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def _present(self, path, value):
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if self.exists(path):
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(current_value, zstat) = self.zk.get(path)
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if value != current_value:
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self.zk.set(path, to_bytes(value))
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return True, {'changed': True, 'msg': 'Updated the znode value.', 'znode': path,
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'value': value}
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else:
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return True, {'changed': False, 'msg': 'No changes were necessary.', 'znode': path, 'value': value}
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else:
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self.zk.create(path, to_bytes(value), makepath=True)
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return True, {'changed': True, 'msg': 'Created a new znode.', 'znode': path, 'value': value}
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def _wait(self, path, timeout, interval=5):
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lim = time.time() + timeout
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while time.time() < lim:
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if self.exists(path):
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return True, {'msg': 'The node appeared before the configured timeout.',
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'znode': path, 'timeout': timeout}
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else:
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time.sleep(interval)
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return False, {'msg': 'The node did not appear before the operation timed out.', 'timeout': timeout,
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'znode': path}
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if __name__ == '__main__':
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main()
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