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323 lines
11 KiB
Python
323 lines
11 KiB
Python
#!/usr/bin/python
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#
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# (c) 2015, Steve Gargan <steve.gargan@gmail.com>
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# (c) 2018 Genome Research Ltd.
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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_kv
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short_description: Manipulate entries in the key/value store of a consul cluster
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description:
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- Allows the retrieval, addition, modification and deletion of key/value entries in a
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consul cluster via the agent. The entire contents of the record, including
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the indices, flags and session are returned as 'value'.
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- If the key represents a prefix then Note that when a value is removed, the existing
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value if any is returned as part of the results.
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- See http://www.consul.io/docs/agent/http.html#kv for more details.
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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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- Colin Nolan (@colin-nolan)
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options:
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state:
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description:
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- The action to take with the supplied key and value. If the state is 'present' and `value` is set, the key
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contents will be set to the value supplied and `changed` will be set to `true` only if the value was
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different to the current contents. If the state is 'present' and `value` is not set, the existing value
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associated to the key will be returned. The state 'absent' will remove the key/value pair,
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again 'changed' will be set to true only if the key actually existed
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prior to the removal. An attempt can be made to obtain or free the
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lock associated with a key/value pair with the states 'acquire' or
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'release' respectively. a valid session must be supplied to make the
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attempt changed will be true if the attempt is successful, false
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otherwise.
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choices: [ absent, acquire, present, release ]
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default: present
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key:
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description:
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- The key at which the value should be stored.
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required: yes
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value:
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description:
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- The value should be associated with the given key, required if C(state)
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is C(present).
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required: yes
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recurse:
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description:
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- If the key represents a prefix, each entry with the prefix can be
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retrieved by setting this to C(yes).
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type: bool
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default: 'no'
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session:
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description:
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- The session that should be used to acquire or release a lock
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associated with a key/value pair.
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token:
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description:
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- The token key indentifying an ACL rule set that controls access to
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the key value pair
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cas:
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description:
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- Used when acquiring a lock with a session. If the C(cas) is C(0), then
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Consul will only put the key if it does not already exist. If the
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C(cas) value is non-zero, then the key is only set if the index matches
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the ModifyIndex of that key.
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flags:
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description:
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- Opaque integer value that can be passed when setting a value.
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host:
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description:
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- Host of the consul agent.
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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: 'yes'
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version_added: "2.1"
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"""
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EXAMPLES = '''
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# If the key does not exist, the value associated to the "data" property in `retrieved_key` will be `None`
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# If the key value is empty string, `retrieved_key["data"]["Value"]` will be `None`
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- name: retrieve a value from the key/value store
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consul_kv:
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key: somekey
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register: retrieved_key
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- name: Add or update the value associated with a key in the key/value store
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consul_kv:
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key: somekey
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value: somevalue
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- name: Remove a key from the store
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consul_kv:
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key: somekey
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state: absent
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- name: Add a node to an arbitrary group via consul inventory (see consul.ini)
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consul_kv:
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key: ansible/groups/dc1/somenode
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value: top_secret
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- name: Register a key/value pair with an associated session
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consul_kv:
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key: stg/node/server_birthday
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value: 20160509
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session: "{{ sessionid }}"
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state: acquire
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'''
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from ansible.module_utils._text import to_text
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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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# Note: although the python-consul documentation implies that using a key with a value of `None` with `put` has a
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# special meaning (https://python-consul.readthedocs.io/en/latest/#consul-kv), if not set in the subsequently API call,
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# the value just defaults to an empty string (https://www.consul.io/api/kv.html#create-update-key)
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NOT_SET = None
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def _has_value_changed(consul_client, key, target_value):
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"""
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Uses the given Consul client to determine if the value associated to the given key is different to the given target
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value.
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:param consul_client: Consul connected client
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:param key: key in Consul
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:param target_value: value to be associated to the key
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:return: tuple where the first element is the value of the "X-Consul-Index" header and the second is `True` if the
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value has changed (i.e. the stored value is not the target value)
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"""
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index, existing = consul_client.kv.get(key)
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if not existing:
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return index, True
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try:
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changed = to_text(existing['Value'], errors='surrogate_or_strict') != target_value
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return index, changed
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except UnicodeError:
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# Existing value was not decodable but all values we set are valid utf-8
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return index, True
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def execute(module):
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state = module.params.get('state')
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if state == 'acquire' or state == 'release':
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lock(module, state)
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elif state == 'present':
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if module.params.get('value') is NOT_SET:
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get_value(module)
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else:
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set_value(module)
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elif state == 'absent':
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remove_value(module)
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else:
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module.exit_json(msg="Unsupported state: %s" % (state, ))
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def lock(module, state):
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consul_api = get_consul_api(module)
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session = module.params.get('session')
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key = module.params.get('key')
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value = module.params.get('value')
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if not session:
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module.fail(
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msg='%s of lock for %s requested but no session supplied' %
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(state, key))
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index, changed = _has_value_changed(consul_api, key, value)
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if changed and not module.check_mode:
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if state == 'acquire':
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changed = consul_api.kv.put(key, value,
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cas=module.params.get('cas'),
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acquire=session,
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flags=module.params.get('flags'))
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else:
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changed = consul_api.kv.put(key, value,
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cas=module.params.get('cas'),
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release=session,
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flags=module.params.get('flags'))
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module.exit_json(changed=changed,
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index=index,
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key=key)
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def get_value(module):
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consul_api = get_consul_api(module)
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key = module.params.get('key')
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index, existing_value = consul_api.kv.get(key, recurse=module.params.get('recurse'))
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module.exit_json(changed=False, index=index, data=existing_value)
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def set_value(module):
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consul_api = get_consul_api(module)
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key = module.params.get('key')
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value = module.params.get('value')
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if value is NOT_SET:
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raise AssertionError('Cannot set value of "%s" to `NOT_SET`' % key)
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index, changed = _has_value_changed(consul_api, key, value)
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if changed and not module.check_mode:
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changed = consul_api.kv.put(key, value,
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cas=module.params.get('cas'),
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flags=module.params.get('flags'))
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stored = None
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if module.params.get('retrieve'):
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index, stored = consul_api.kv.get(key)
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module.exit_json(changed=changed,
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index=index,
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key=key,
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data=stored)
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def remove_value(module):
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''' remove the value associated with the given key. if the recurse parameter
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is set then any key prefixed with the given key will be removed. '''
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consul_api = get_consul_api(module)
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key = module.params.get('key')
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index, existing = consul_api.kv.get(
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key, recurse=module.params.get('recurse'))
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changed = existing is not None
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if changed and not module.check_mode:
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consul_api.kv.delete(key, module.params.get('recurse'))
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module.exit_json(changed=changed,
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index=index,
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key=key,
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data=existing)
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def get_consul_api(module, token=None):
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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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scheme=module.params.get('scheme'),
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verify=module.params.get('validate_certs'),
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token=module.params.get('token'))
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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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module = AnsibleModule(
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argument_spec=dict(
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cas=dict(type='str'),
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flags=dict(type='str'),
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key=dict(type='str', required=True),
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host=dict(type='str', default='localhost'),
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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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port=dict(type='int', default=8500),
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recurse=dict(type='bool'),
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retrieve=dict(type='bool', default=True),
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state=dict(type='str', default='present', choices=['absent', 'acquire', 'present', 'release']),
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token=dict(type='str', no_log=True),
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value=dict(type='str', default=NOT_SET),
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session=dict(type='str'),
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),
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supports_check_mode=False
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)
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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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