#!/usr/bin/env python
# Copyright (c) 2015, Normation SAS
#
# Inspired by the EC2 inventory plugin:
# https://github.com/ansible/ansible/blob/devel/contrib/inventory/ec2.py
#
# 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/>.
######################################################################
'''
Rudder external inventory script
=================================
Generates inventory that Ansible can understand by making API request to
a Rudder server. This script is compatible with Rudder 2.10 or later.
The output JSON includes all your Rudder groups, containing the hostnames of
their nodes. Groups and nodes have a variable called rudder_group_id and
rudder_node_id, which is the Rudder internal id of the item, allowing to identify
them uniquely. Hosts variables also include your node properties, which are
key => value properties set by the API and specific to each node.
This script assumes there is an rudder.ini file alongside it. To specify a
different path to rudder.ini, define the RUDDER_INI_PATH environment variable:
export RUDDER_INI_PATH=/path/to/my_rudder.ini
You have to configure your Rudder server information, either in rudder.ini or
by overriding it with environment variables:
export RUDDER_API_VERSION='latest'
export RUDDER_API_TOKEN='my_token'
export RUDDER_API_URI='https://rudder.local/rudder/api'
'''
import sys
import os
import re
import argparse
import six
import httplib2 as http
from time import time
from six.moves import configparser
try:
from urlparse import urlparse
except ImportError:
from urllib.parse import urlparse
try:
import json
except ImportError:
import simplejson as json
class RudderInventory(object):
def __init__(self):
''' Main execution path '''
# Empty inventory by default
self.inventory = {}
# Read settings and parse CLI arguments
self.read_settings()
self.parse_cli_args()
# Create connection
self.conn = http.Http(disable_ssl_certificate_validation=self.disable_ssl_validation)
# Cache
if self.args.refresh_cache:
self.update_cache()
elif not self.is_cache_valid():
self.update_cache()
else:
self.load_cache()
data_to_print = {}
if self.args.host:
data_to_print = self.get_host_info(self.args.host)
elif self.args.list:
data_to_print = self.get_list_info()
print(self.json_format_dict(data_to_print, True))
def read_settings(self):
''' Reads the settings from the rudder.ini file '''
if six.PY2:
config = configparser.SafeConfigParser()
else:
config = configparser.ConfigParser()
rudder_default_ini_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'rudder.ini')
rudder_ini_path = os.path.expanduser(os.path.expandvars(os.environ.get('RUDDER_INI_PATH', rudder_default_ini_path)))
config.read(rudder_ini_path)
self.token = os.environ.get('RUDDER_API_TOKEN', config.get('rudder', 'token'))
self.version = os.environ.get('RUDDER_API_VERSION', config.get('rudder', 'version'))
self.uri = os.environ.get('RUDDER_API_URI', config.get('rudder', 'uri'))
self.disable_ssl_validation = config.getboolean('rudder', 'disable_ssl_certificate_validation')
self.group_name = config.get('rudder', 'group_name')
self.fail_if_name_collision = config.getboolean('rudder', 'fail_if_name_collision')
self.cache_path = config.get('rudder', 'cache_path')
self.cache_max_age = config.getint('rudder', 'cache_max_age')
def parse_cli_args(self):
''' Command line argument processing '''
parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on Rudder inventory')
parser.add_argument('--list', action='store_true', default=True,
help='List instances (default: True)')
parser.add_argument('--host', action='store',
help='Get all the variables about a specific instance')
parser.add_argument('--refresh-cache', action='store_true', default=False,
help='Force refresh of cache by making API requests to Rudder (default: False - use cache files)')
self.args = parser.parse_args()
def is_cache_valid(self):
''' Determines if the cache files have expired, or if it is still valid '''
if os.path.isfile(self.cache_path):
mod_time = os.path.getmtime(self.cache_path)
current_time = time()
if (mod_time + self.cache_max_age) > current_time:
return True
return False
def load_cache(self):
''' Reads the cache from the cache file sets self.cache '''
cache = open(self.cache_path, 'r')
json_cache = cache.read()
try:
self.inventory = json.loads(json_cache)
except ValueError, e:
self.fail_with_error('Could not parse JSON response from local cache', 'parsing local cache')
def write_cache(self):
''' Writes data in JSON format to a file '''
json_data = self.json_format_dict(self.inventory, True)
cache = open(self.cache_path, 'w')
cache.write(json_data)
cache.close()
def get_nodes(self):
''' Gets the nodes list from Rudder '''
path = '/nodes?select=nodeAndPolicyServer'
result = self.api_call(path)
nodes = {}
for node in result['data']['nodes']:
nodes[node['id']] = {}
nodes[node['id']]['hostname'] = node['hostname']
if 'properties' in node:
nodes[node['id']]['properties'] = node['properties']
else:
nodes[node['id']]['properties'] = []
return nodes
def get_groups(self):
''' Gets the groups list from Rudder '''
path = '/groups'
result = self.api_call(path)
groups = {}
for group in result['data']['groups']:
groups[group['id']] = {'hosts': group['nodeIds'], 'name': self.to_safe(group[self.group_name])}
return groups
def update_cache(self):
''' Fetches the inventory information from Rudder and creates the inventory '''
nodes = self.get_nodes()
groups = self.get_groups()
inventory = {}
for group in groups:
# Check for name collision
if self.fail_if_name_collision:
if groups[group]['name'] in inventory:
self.fail_with_error('Name collision on groups: "%s" appears twice' % groups[group]['name'], 'creating groups')
# Add group to inventory
inventory[groups[group]['name']] = {}
inventory[groups[group]['name']]['hosts'] = []
inventory[groups[group]['name']]['vars'] = {}
inventory[groups[group]['name']]['vars']['rudder_group_id'] = group
for node in groups[group]['hosts']:
# Add node to group
inventory[groups[group]['name']]['hosts'].append(nodes[node]['hostname'])
properties = {}
for node in nodes:
# Check for name collision
if self.fail_if_name_collision:
if nodes[node]['hostname'] in properties:
self.fail_with_error('Name collision on hosts: "%s" appears twice' % nodes[node]['hostname'], 'creating hosts')
# Add node properties to inventory
properties[nodes[node]['hostname']] = {}
properties[nodes[node]['hostname']]['rudder_node_id'] = node
for node_property in nodes[node]['properties']:
properties[nodes[node]['hostname']][self.to_safe(node_property['name'])] = node_property['value']
inventory['_meta'] = {}
inventory['_meta']['hostvars'] = properties
self.inventory = inventory
if self.cache_max_age > 0:
self.write_cache()
def get_list_info(self):
''' Gets inventory information from local cache '''
return self.inventory
def get_host_info(self, hostname):
''' Gets information about a specific host from local cache '''
if hostname in self.inventory['_meta']['hostvars']:
return self.inventory['_meta']['hostvars'][hostname]
else:
return {}
def api_call(self, path):
''' Performs an API request '''
headers = {
'X-API-Token': self.token,
'X-API-Version': self.version,
'Content-Type': 'application/json;charset=utf-8'
}
target = urlparse(self.uri + path)
method = 'GET'
body = ''
try:
response, content = self.conn.request(target.geturl(), method, body, headers)
except:
self.fail_with_error('Error connecting to Rudder server')
try:
data = json.loads(content)
except ValueError, e:
self.fail_with_error('Could not parse JSON response from Rudder API', 'reading API response')
return data
def fail_with_error(self, err_msg, err_operation=None):
''' Logs an error to std err for ansible-playbook to consume and exit '''
if err_operation:
err_msg = 'ERROR: "{err_msg}", while: {err_operation}'.format(
err_msg=err_msg, err_operation=err_operation)
sys.stderr.write(err_msg)
sys.exit(1)
def json_format_dict(self, data, pretty=False):
''' Converts a dict to a JSON object and dumps it as a formatted
string '''
if pretty:
return json.dumps(data, sort_keys=True, indent=2)
else:
return json.dumps(data)
def to_safe(self, word):
''' Converts 'bad' characters in a string to underscores so they can be
used as Ansible variable names '''
return re.sub('[^A-Za-z0-9\_]', '_', word)
# Run the script
RudderInventory()