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# (c) 2015, Steve Gargan <steve.gargan@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
'''
Lookup plugin to grab metadata from a consul key value store.
============================================================
Plugin will lookup metadata for a playbook from the key value store in a
consul cluster. Values can be easily set in the kv store with simple rest
commands e.g.
curl -X PUT -d 'some-value' http://localhost:8500/v1/kv/ansible/somedata
this can then be looked up in a playbook as follows
- debug: msg='key contains {{item}}'
with_consul_kv:
- 'key/to/retrieve'
Parameters can be provided after the key be more specific about what to retrieve e.g.
- debug: msg='key contains {{item}}'
with_consul_kv:
- 'key/to recurse=true token=E6C060A9-26FB-407A-B83E-12DDAFCB4D98')}}'
recurse: if true, will retrieve all the values that have the given key as prefix
index: if the key has a value with the specified index then this is returned
allowing access to historical values.
token: acl token to allow access to restricted values.
By default this will lookup keys via the consul agent running on http://localhost:8500
this can be changed by setting the env variable 'ANSIBLE_CONSUL_URL' to point to the url
of the kv store you'd like to use.
'''
######################################################################
import os
import sys
from urlparse import urlparse
from ansible.errors import AnsibleError
from ansible.plugins.lookup import LookupBase
try:
import json
except ImportError:
import simplejson as json
try:
import consul
HAS_CONSUL = True
except ImportError as e:
HAS_CONSUL = False
class LookupModule(LookupBase):
def __init__(self, loader=None, templar=None, **kwargs):
super(LookupModule, self).__init__(loader, templar, **kwargs)
self.agent_url = 'http://localhost:8500'
if os.getenv('ANSIBLE_CONSUL_URL') is not None:
self.agent_url = os.environ['ANSIBLE_CONSUL_URL']
def run(self, terms, variables=None, **kwargs):
if not HAS_CONSUL:
raise AnsibleError('python-consul is required for consul_kv lookup. see http://python-consul.readthedocs.org/en/latest/#installation')
u = urlparse(self.agent_url)
consul_api = consul.Consul(host=u.hostname, port=u.port)
values = []
try:
for term in terms:
params = self.parse_params(term)
results = consul_api.kv.get(params['key'],
token=params['token'],
index=params['index'],
recurse=params['recurse'])
if results[1]:
# responds with a single or list of result maps
if isinstance(results[1], list):
for r in results[1]:
values.append(r['Value'])
else:
values.append(results[1]['Value'])
except Exception as e:
raise AnsibleError(
"Error locating '%s' in kv store. Error was %s" % (term, e))
return values
def parse_params(self, term):
params = term.split(' ')
paramvals = {
'key': params[0],
'token': None,
'recurse': False,
'index': None
}
# parameters specified?
try:
for param in params[1:]:
if param and len(param) > 0:
name, value = param.split('=')
assert name in paramvals, "%s not a valid consul lookup parameter" % name
paramvals[name] = value
except (ValueError, AssertionError) as e:
raise AnsibleError(e)
return paramvals
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