# (c) 2013, Jan-Piet Mens # (m) 2016, Mihai Moldovanu # (m) 2017, Juan Manuel Parrilla # # 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 . from __future__ import (absolute_import, division, print_function) __metaclass__ = type DOCUMENTATION = ''' author: - Jan-Piet Mens (@jpmens) lookup: etcd version_added: "2.1" short_description: get info from an etcd server description: - Retrieves data from an etcd server options: _terms: description: - the list of keys to lookup on the etcd server type: list elements: string required: True url: description: - Environment variable with the url for the etcd server default: 'http://127.0.0.1:4001' env: - name: ANSIBLE_ETCD_URL version: description: - Environment variable with the etcd protocol version default: 'v1' env: - name: ANSIBLE_ETCD_VERSION validate_certs: description: - toggle checking that the ssl certificates are valid, you normally only want to turn this off with self-signed certs. default: True type: boolean ''' EXAMPLES = ''' - name: "a value from a locally running etcd" debug: msg={{ lookup('etcd', 'foo/bar') }} - name: "values from multiple folders on a locally running etcd" debug: msg={{ lookup('etcd', 'foo', 'bar', 'baz') }} - name: "since Ansible 2.5 you can set server options inline" debug: msg="{{ lookup('etcd', 'foo', version='v2', url='http://192.168.0.27:4001') }}" ''' RETURN = ''' _raw: description: - list of values associated with input keys type: list elements: strings ''' import json from ansible.plugins.lookup import LookupBase from ansible.module_utils.urls import open_url # this can be made configurable, not should not use ansible.cfg # # Made module configurable from playbooks: # If etcd v2 running on host 192.168.1.21 on port 2379 # we can use the following in a playbook to retrieve /tfm/network/config key # # - debug: msg={{lookup('etcd','/tfm/network/config', url='http://192.168.1.21:2379' , version='v2')}} # # Example Output: # # TASK [debug] ******************************************************************* # ok: [localhost] => { # "msg": { # "Backend": { # "Type": "vxlan" # }, # "Network": "172.30.0.0/16", # "SubnetLen": 24 # } # } # # # # class Etcd: def __init__(self, url, version, validate_certs): self.url = url self.version = version self.baseurl = '%s/%s/keys' % (self.url, self.version) self.validate_certs = validate_certs def _parse_node(self, node): # This function will receive all etcd tree, # if the level requested has any node, the recursion starts # create a list in the dir variable and it is passed to the # recursive function, and so on, if we get a variable, # the function will create a key-value at this level and # undoing the loop. path = {} if node.get('dir', False): for n in node.get('nodes', []): path[n['key'].split('/')[-1]] = self._parse_node(n) else: path = node['value'] return path def get(self, key): url = "%s/%s?recursive=true" % (self.baseurl, key) data = None value = {} try: r = open_url(url, validate_certs=self.validate_certs) data = r.read() except Exception: return None try: # I will not support Version 1 of etcd for folder parsing item = json.loads(data) if self.version == 'v1': # When ETCD are working with just v1 if 'value' in item: value = item['value'] else: if 'node' in item: # When a usual result from ETCD value = self._parse_node(item['node']) if 'errorCode' in item: # Here return an error when an unknown entry responds value = "ENOENT" except Exception: raise return value class LookupModule(LookupBase): def run(self, terms, variables, **kwargs): self.set_options(var_options=variables, direct=kwargs) validate_certs = self.get_option('validate_certs') url = self.get_option('url') version = self.get_option('version') etcd = Etcd(url=url, version=version, validate_certs=validate_certs) ret = [] for term in terms: key = term.split()[0] value = etcd.get(key) ret.append(value) return ret