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116 lines
3.0 KiB
Python
116 lines
3.0 KiB
Python
#!/usr/bin/env python
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# (c) 2015, Marc Abramowitz <marca@surveymonkey.com>
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#
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# This file is part of Ansible.
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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# Dynamic inventory script which lets you use nodes discovered by Serf
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# (https://serfdom.io/).
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#
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# Requires the `serfclient` Python module from
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# https://pypi.org/project/serfclient/
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#
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# Environment variables
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# ---------------------
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# - `SERF_RPC_ADDR`
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# - `SERF_RPC_AUTH`
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#
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# These variables are described at https://www.serfdom.io/docs/commands/members.html#_rpc_addr
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import argparse
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import collections
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import os
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import sys
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# https://pypi.org/project/serfclient/
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from serfclient import SerfClient, EnvironmentConfig
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try:
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import json
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except ImportError:
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import simplejson as json
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_key = 'serf'
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def _serf_client():
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env = EnvironmentConfig()
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return SerfClient(host=env.host, port=env.port, rpc_auth=env.auth_key)
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def get_serf_members_data():
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return _serf_client().members().body['Members']
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def get_nodes(data):
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return [node['Name'] for node in data]
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def get_groups(data):
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groups = collections.defaultdict(list)
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for node in data:
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for key, value in node['Tags'].items():
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groups[value].append(node['Name'])
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return groups
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def get_meta(data):
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meta = {'hostvars': {}}
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for node in data:
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meta['hostvars'][node['Name']] = node['Tags']
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return meta
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def print_list():
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data = get_serf_members_data()
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nodes = get_nodes(data)
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groups = get_groups(data)
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meta = get_meta(data)
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inventory_data = {_key: nodes, '_meta': meta}
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inventory_data.update(groups)
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print(json.dumps(inventory_data))
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def print_host(host):
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data = get_serf_members_data()
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meta = get_meta(data)
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print(json.dumps(meta['hostvars'][host]))
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def get_args(args_list):
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parser = argparse.ArgumentParser(
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description='ansible inventory script reading from serf cluster')
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mutex_group = parser.add_mutually_exclusive_group(required=True)
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help_list = 'list all hosts from serf cluster'
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mutex_group.add_argument('--list', action='store_true', help=help_list)
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help_host = 'display variables for a host'
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mutex_group.add_argument('--host', help=help_host)
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return parser.parse_args(args_list)
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def main(args_list):
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args = get_args(args_list)
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if args.list:
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print_list()
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if args.host:
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print_host(args.host)
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if __name__ == '__main__':
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main(sys.argv[1:])
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