mirror of
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270 lines
8.7 KiB
Python
270 lines
8.7 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# Copyright: (c) 2015, Steve Gargan <steve.gargan@gmail.com>
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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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module: consul_session
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short_description: Manipulate consul sessions
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description:
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- Allows the addition, modification and deletion of sessions in a consul
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cluster. These sessions can then be used in conjunction with key value pairs
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to implement distributed locks. In depth documentation for working with
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sessions can be found at http://www.consul.io/docs/internals/sessions.html
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requirements:
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- python >= 2.6
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- python-consul
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- requests
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version_added: "2.0"
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author:
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- Steve Gargan (@sgargan)
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options:
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state:
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description:
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- Whether the session should be present i.e. created if it doesn't
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exist, or absent, removed if present. If created, the ID for the
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session is returned in the output. If absent, the name or ID is
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required to remove the session. Info for a single session, all the
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sessions for a node or all available sessions can be retrieved by
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specifying info, node or list for the state; for node or info, the
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node name or session id is required as parameter.
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choices: [ absent, info, list, node, present ]
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default: present
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name:
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description:
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- The name that should be associated with the session. This is opaque
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to Consul and not required.
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delay:
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description:
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- The optional lock delay that can be attached to the session when it
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is created. Locks for invalidated sessions ar blocked from being
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acquired until this delay has expired. Durations are in seconds.
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default: 15
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node:
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description:
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- The name of the node that with which the session will be associated.
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by default this is the name of the agent.
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datacenter:
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description:
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- The name of the datacenter in which the session exists or should be
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created.
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checks:
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description:
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- A list of checks that will be used to verify the session health. If
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all the checks fail, the session will be invalidated and any locks
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associated with the session will be release and can be acquired once
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the associated lock delay has expired.
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host:
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description:
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- The host of the consul agent defaults to localhost.
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default: localhost
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port:
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description:
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- The port on which the consul agent is running.
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default: 8500
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scheme:
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description:
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- The protocol scheme on which the consul agent is running.
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default: http
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version_added: "2.1"
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validate_certs:
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description:
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- Whether to verify the tls certificate of the consul agent.
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type: bool
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default: True
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version_added: "2.1"
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behavior:
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description:
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- The optional behavior that can be attached to the session when it
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is created. This controls the behavior when a session is invalidated.
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choices: [ delete, release ]
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default: release
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version_added: "2.2"
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"""
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EXAMPLES = '''
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- name: register basic session with consul
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consul_session:
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name: session1
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- name: register a session with an existing check
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consul_session:
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name: session_with_check
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checks:
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- existing_check_name
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- name: register a session with lock_delay
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consul_session:
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name: session_with_delay
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delay: 20s
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- name: retrieve info about session by id
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consul_session:
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id: session_id
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state: info
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- name: retrieve active sessions
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consul_session:
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state: list
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'''
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try:
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import consul
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from requests.exceptions import ConnectionError
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python_consul_installed = True
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except ImportError:
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python_consul_installed = False
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from ansible.module_utils.basic import AnsibleModule
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def execute(module):
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state = module.params.get('state')
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if state in ['info', 'list', 'node']:
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lookup_sessions(module)
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elif state == 'present':
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update_session(module)
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else:
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remove_session(module)
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def lookup_sessions(module):
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datacenter = module.params.get('datacenter')
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state = module.params.get('state')
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consul_client = get_consul_api(module)
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try:
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if state == 'list':
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sessions_list = consul_client.session.list(dc=datacenter)
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# Ditch the index, this can be grabbed from the results
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if sessions_list and sessions_list[1]:
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sessions_list = sessions_list[1]
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module.exit_json(changed=True,
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sessions=sessions_list)
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elif state == 'node':
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node = module.params.get('node')
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if not node:
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module.fail_json(
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msg="node name is required to retrieve sessions for node")
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sessions = consul_client.session.node(node, dc=datacenter)
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module.exit_json(changed=True,
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node=node,
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sessions=sessions)
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elif state == 'info':
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session_id = module.params.get('id')
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if not session_id:
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module.fail_json(
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msg="session_id is required to retrieve indvidual session info")
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session_by_id = consul_client.session.info(session_id, dc=datacenter)
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module.exit_json(changed=True,
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session_id=session_id,
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sessions=session_by_id)
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except Exception as e:
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module.fail_json(msg="Could not retrieve session info %s" % e)
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def update_session(module):
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name = module.params.get('name')
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delay = module.params.get('delay')
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checks = module.params.get('checks')
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datacenter = module.params.get('datacenter')
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node = module.params.get('node')
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behavior = module.params.get('behavior')
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consul_client = get_consul_api(module)
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try:
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session = consul_client.session.create(
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name=name,
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behavior=behavior,
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node=node,
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lock_delay=delay,
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dc=datacenter,
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checks=checks
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)
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module.exit_json(changed=True,
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session_id=session,
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name=name,
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behavior=behavior,
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delay=delay,
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checks=checks,
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node=node)
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except Exception as e:
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module.fail_json(msg="Could not create/update session %s" % e)
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def remove_session(module):
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session_id = module.params.get('id')
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if not session_id:
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module.fail_json(msg="""A session id must be supplied in order to
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remove a session.""")
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consul_client = get_consul_api(module)
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try:
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consul_client.session.destroy(session_id)
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module.exit_json(changed=True,
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session_id=session_id)
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except Exception as e:
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module.fail_json(msg="Could not remove session with id '%s' %s" % (
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session_id, e))
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def get_consul_api(module):
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return consul.Consul(host=module.params.get('host'),
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port=module.params.get('port'))
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def test_dependencies(module):
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if not python_consul_installed:
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module.fail_json(msg="python-consul required for this module. "
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"see https://python-consul.readthedocs.io/en/latest/#installation")
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def main():
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argument_spec = dict(
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checks=dict(type='list'),
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delay=dict(type='int', default='15'),
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behavior=dict(type='str', default='release', choices=['release', 'delete']),
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host=dict(type='str', default='localhost'),
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port=dict(type='int', default=8500),
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scheme=dict(type='str', default='http'),
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validate_certs=dict(type='bool', default=True),
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id=dict(type='str'),
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name=dict(type='str'),
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node=dict(type='str'),
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state=dict(type='str', default='present', choices=['absent', 'info', 'list', 'node', 'present']),
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datacenter=dict(type='str'),
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)
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module = AnsibleModule(argument_spec, supports_check_mode=False)
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test_dependencies(module)
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try:
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execute(module)
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except ConnectionError as e:
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module.fail_json(msg='Could not connect to consul agent at %s:%s, error was %s' % (
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module.params.get('host'), module.params.get('port'), e))
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except Exception as e:
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module.fail_json(msg=str(e))
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if __name__ == '__main__':
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main()
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