ansible/contrib/inventory/serf.py

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#!/usr/bin/env python
# (c) 2015, Marc Abramowitz <marca@surveymonkey.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/>.
# Dynamic inventory script which lets you use nodes discovered by Serf
# (https://serfdom.io/).
#
# Requires the `serfclient` Python module from
# https://pypi.org/project/serfclient/
#
# Environment variables
# ---------------------
# - `SERF_RPC_ADDR`
# - `SERF_RPC_AUTH`
#
# These variables are described at https://www.serfdom.io/docs/commands/members.html#_rpc_addr
import argparse
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import collections
import os
import sys
# https://pypi.org/project/serfclient/
from serfclient import SerfClient, EnvironmentConfig
try:
import json
except ImportError:
import simplejson as json
_key = 'serf'
def _serf_client():
env = EnvironmentConfig()
return SerfClient(host=env.host, port=env.port, rpc_auth=env.auth_key)
def get_serf_members_data():
return _serf_client().members().body['Members']
def get_nodes(data):
return [node['Name'] for node in data]
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def get_groups(data):
groups = collections.defaultdict(list)
for node in data:
for key, value in node['Tags'].items():
groups[value].append(node['Name'])
return groups
def get_meta(data):
meta = {'hostvars': {}}
for node in data:
meta['hostvars'][node['Name']] = node['Tags']
return meta
def print_list():
data = get_serf_members_data()
nodes = get_nodes(data)
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groups = get_groups(data)
meta = get_meta(data)
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inventory_data = {_key: nodes, '_meta': meta}
inventory_data.update(groups)
print(json.dumps(inventory_data))
def print_host(host):
data = get_serf_members_data()
meta = get_meta(data)
print(json.dumps(meta['hostvars'][host]))
def get_args(args_list):
parser = argparse.ArgumentParser(
description='ansible inventory script reading from serf cluster')
mutex_group = parser.add_mutually_exclusive_group(required=True)
help_list = 'list all hosts from serf cluster'
mutex_group.add_argument('--list', action='store_true', help=help_list)
help_host = 'display variables for a host'
mutex_group.add_argument('--host', help=help_host)
return parser.parse_args(args_list)
def main(args_list):
args = get_args(args_list)
if args.list:
print_list()
if args.host:
print_host(args.host)
if __name__ == '__main__':
main(sys.argv[1:])