#!/usr/bin/env python
# (c) 2013, Sebastien Goasguen <runseb@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/>.
######################################################################
'''
Apache Libcloud generic external inventory script
=================================
Generates inventory that Ansible can understand by making API request to
Cloud providers using the Apache libcloud library.
This script also assumes there is a libcloud.ini file alongside it
'''
import sys
import os
import argparse
import re
from time import time
import ConfigParser
from six import iteritems, string_types
from libcloud.compute.types import Provider
from libcloud.compute.providers import get_driver
import libcloud.security as sec
import json
class LibcloudInventory(object):
def __init__(self):
''' Main execution path '''
# Inventory grouped by instance IDs, tags, security groups, regions,
# and availability zones
self.inventory = {}
# Index of hostname (address) to instance ID
self.index = {}
# Read settings and parse CLI arguments
self.read_settings()
self.parse_cli_args()
# Cache
if self.args.refresh_cache:
self.do_api_calls_update_cache()
elif not self.is_cache_valid():
self.do_api_calls_update_cache()
# Data to print
if self.args.host:
data_to_print = self.get_host_info()
elif self.args.list:
# Display list of instances for inventory
if len(self.inventory) == 0:
data_to_print = self.get_inventory_from_cache()
else:
data_to_print = self.json_format_dict(self.inventory, True)
print(data_to_print)
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_cache):
mod_time = os.path.getmtime(self.cache_path_cache)
current_time = time()
if (mod_time + self.cache_max_age) > current_time:
if os.path.isfile(self.cache_path_index):
return True
return False
def read_settings(self):
''' Reads the settings from the libcloud.ini file '''
config = ConfigParser.SafeConfigParser()
libcloud_default_ini_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'libcloud.ini')
libcloud_ini_path = os.environ.get('LIBCLOUD_INI_PATH', libcloud_default_ini_path)
config.read(libcloud_ini_path)
if not config.has_section('driver'):
raise ValueError('libcloud.ini file must contain a [driver] section')
if config.has_option('driver', 'provider'):
self.provider = config.get('driver', 'provider')
else:
raise ValueError('libcloud.ini does not have a provider defined')
if config.has_option('driver', 'key'):
self.key = config.get('driver', 'key')
else:
raise ValueError('libcloud.ini does not have a key defined')
if config.has_option('driver', 'secret'):
self.secret = config.get('driver', 'secret')
else:
raise ValueError('libcloud.ini does not have a secret defined')
if config.has_option('driver', 'host'):
self.host = config.get('driver', 'host')
if config.has_option('driver', 'secure'):
self.secure = config.get('driver', 'secure')
if config.has_option('driver', 'verify_ssl_cert'):
self.verify_ssl_cert = config.get('driver', 'verify_ssl_cert')
if config.has_option('driver', 'port'):
self.port = config.get('driver', 'port')
if config.has_option('driver', 'path'):
self.path = config.get('driver', 'path')
if config.has_option('driver', 'api_version'):
self.api_version = config.get('driver', 'api_version')
Driver = get_driver(getattr(Provider, self.provider))
self.conn = Driver(key=self.key, secret=self.secret, secure=self.secure,
host=self.host, path=self.path)
# Cache related
cache_path = config.get('cache', 'cache_path')
self.cache_path_cache = cache_path + "/ansible-libcloud.cache"
self.cache_path_index = cache_path + "/ansible-libcloud.index"
self.cache_max_age = config.getint('cache', 'cache_max_age')
def parse_cli_args(self):
'''
Command line argument processing
'''
parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on libcloud supported providers')
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 libcloud supported providers (default: False - use cache files)')
self.args = parser.parse_args()
def do_api_calls_update_cache(self):
'''
Do API calls to a location, and save data in cache files
'''
self.get_nodes()
self.write_to_cache(self.inventory, self.cache_path_cache)
self.write_to_cache(self.index, self.cache_path_index)
def get_nodes(self):
'''
Gets the list of all nodes
'''
for node in self.conn.list_nodes():
self.add_node(node)
def get_node(self, node_id):
'''
Gets details about a specific node
'''
return [node for node in self.conn.list_nodes() if node.id == node_id][0]
def add_node(self, node):
'''
Adds a node to the inventory and index, as long as it is
addressable
'''
# Only want running instances
if node.state != 0:
return
# Select the best destination address
if not node.public_ips == []:
dest = node.public_ips[0]
if not dest:
# Skip instances we cannot address (e.g. private VPC subnet)
return
# Add to index
self.index[dest] = node.name
# Inventory: Group by instance ID (always a group of 1)
self.inventory[node.name] = [dest]
'''
# Inventory: Group by region
self.push(self.inventory, region, dest)
# Inventory: Group by availability zone
self.push(self.inventory, node.placement, dest)
# Inventory: Group by instance type
self.push(self.inventory, self.to_safe('type_' + node.instance_type), dest)
'''
# Inventory: Group by key pair
if node.extra['key_name']:
self.push(self.inventory, self.to_safe('key_' + node.extra['key_name']), dest)
# Inventory: Group by security group, quick thing to handle single sg
if node.extra['security_group']:
self.push(self.inventory, self.to_safe('sg_' + node.extra['security_group'][0]), dest)
# Inventory: Group by tag
if node.extra['tags']:
for tagkey in node.extra['tags'].keys():
self.push(self.inventory, self.to_safe('tag_' + tagkey + '_' + node.extra['tags'][tagkey]), dest)
def get_host_info(self):
'''
Get variables about a specific host
'''
if len(self.index) == 0:
# Need to load index from cache
self.load_index_from_cache()
if self.args.host not in self.index:
# try updating the cache
self.do_api_calls_update_cache()
if self.args.host not in self.index:
# host migh not exist anymore
return self.json_format_dict({}, True)
node_id = self.index[self.args.host]
node = self.get_node(node_id)
instance_vars = {}
for key, value in vars(node).items():
key = self.to_safe('ec2_' + key)
# Handle complex types
if isinstance(value, (int, bool)):
instance_vars[key] = value
elif isinstance(value, string_types):
instance_vars[key] = value.strip()
elif value is None:
instance_vars[key] = ''
elif key == 'ec2_region':
instance_vars[key] = value.name
elif key == 'ec2_tags':
for k, v in iteritems(value):
key = self.to_safe('ec2_tag_' + k)
instance_vars[key] = v
elif key == 'ec2_groups':
group_ids = []
group_names = []
for group in value:
group_ids.append(group.id)
group_names.append(group.name)
instance_vars["ec2_security_group_ids"] = ','.join(group_ids)
instance_vars["ec2_security_group_names"] = ','.join(group_names)
else:
pass
# TODO Product codes if someone finds them useful
# print(key)
# print(type(value))
# print(value)
return self.json_format_dict(instance_vars, True)
def push(self, my_dict, key, element):
'''
Pushed an element onto an array that may not have been defined in
the dict
'''
if key in my_dict:
my_dict[key].append(element)
else:
my_dict[key] = [element]
def get_inventory_from_cache(self):
'''
Reads the inventory from the cache file and returns it as a JSON
object
'''
cache = open(self.cache_path_cache, 'r')
json_inventory = cache.read()
return json_inventory
def load_index_from_cache(self):
'''
Reads the index from the cache file sets self.index
'''
cache = open(self.cache_path_index, 'r')
json_index = cache.read()
self.index = json.loads(json_index)
def write_to_cache(self, data, filename):
'''
Writes data in JSON format to a file
'''
json_data = self.json_format_dict(data, True)
cache = open(filename, 'w')
cache.write(json_data)
cache.close()
def to_safe(self, word):
'''
Converts 'bad' characters in a string to underscores so they can be
used as Ansible groups
'''
return re.sub(r"[^A-Za-z0-9\-]", "_", word)
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 main():
LibcloudInventory()
if __name__ == '__main__':
main()