Generic libcloud script for ansible inventory
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Sebastien Goasguen
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commit
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2 changed files with 370 additions and 0 deletions
355
plugins/inventory/apache-libcloud.py
Executable file
355
plugins/inventory/apache-libcloud.py
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#!/usr/bin/env python
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# (c) 2013, Sebastien Goasguen <runseb@gmail.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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######################################################################
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'''
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Apache Libcloud generic external inventory script
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=================================
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Generates inventory that Ansible can understand by making API request to
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Cloud providers using the Apache libcloud library.
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This script also assumes there is a libcloud.ini file alongside it
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'''
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import sys
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import os
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import argparse
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import re
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from time import time
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import ConfigParser
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from libcloud.compute.types import Provider
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from libcloud.compute.providers import get_driver
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import libcloud.security as sec
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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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class LibcloudInventory(object):
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def __init__(self):
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''' Main execution path '''
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# Inventory grouped by instance IDs, tags, security groups, regions,
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# and availability zones
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self.inventory = {}
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# Index of hostname (address) to instance ID
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self.index = {}
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# Read settings and parse CLI arguments
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self.read_settings()
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self.parse_cli_args()
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# Cache
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if self.args.refresh_cache:
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self.do_api_calls_update_cache()
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elif not self.is_cache_valid():
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self.do_api_calls_update_cache()
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# Data to print
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if self.args.host:
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data_to_print = self.get_host_info()
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elif self.args.list:
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# Display list of instances for inventory
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if len(self.inventory) == 0:
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data_to_print = self.get_inventory_from_cache()
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else:
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data_to_print = self.json_format_dict(self.inventory, True)
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print data_to_print
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def is_cache_valid(self):
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''' Determines if the cache files have expired, or if it is still valid '''
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if os.path.isfile(self.cache_path_cache):
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mod_time = os.path.getmtime(self.cache_path_cache)
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current_time = time()
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if (mod_time + self.cache_max_age) > current_time:
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if os.path.isfile(self.cache_path_index):
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return True
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return False
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def read_settings(self):
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''' Reads the settings from the libcloud.ini file '''
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config = ConfigParser.SafeConfigParser()
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libcloud_default_ini_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'libcloud.ini')
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libcloud_ini_path = os.environ.get('LIBCLOUD_INI_PATH', libcloud_default_ini_path)
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config.read(libcloud_ini_path)
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if not config.has_section('driver'):
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raise ValueError('libcloud.ini file must contain a [driver] section')
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if config.has_option('driver', 'provider'):
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self.provider = config.get('driver','provider')
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else:
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raise ValueError('libcloud.ini does not have a provider defined')
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if config.has_option('driver', 'key'):
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self.key = config.get('driver','key')
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else:
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raise ValueError('libcloud.ini does not have a key defined')
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if config.has_option('driver', 'secret'):
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self.secret = config.get('driver','secret')
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else:
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raise ValueError('libcloud.ini does not have a secret defined')
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if config.has_option('driver', 'host'):
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self.host = config.get('driver', 'host')
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if config.has_option('driver', 'secure'):
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self.secure = config.get('driver', 'secure')
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if config.has_option('driver', 'verify_ssl_cert'):
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self.verify_ssl_cert = config.get('driver', 'verify_ssl_cert')
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if config.has_option('driver', 'port'):
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self.port = config.get('driver', 'port')
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if config.has_option('driver', 'path'):
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self.path = config.get('driver', 'path')
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if config.has_option('driver', 'api_version'):
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self.api_version = config.get('driver', 'api_version')
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Driver = get_driver(getattr(Provider, self.provider))
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self.conn = Driver(key=self.key, secret=self.secret, secure=self.secure,
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host=self.host, path=self.path)
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# Cache related
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cache_path = config.get('cache', 'cache_path')
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self.cache_path_cache = cache_path + "/ansible-libcloud.cache"
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self.cache_path_index = cache_path + "/ansible-libcloud.index"
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self.cache_max_age = config.getint('cache', 'cache_max_age')
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def parse_cli_args(self):
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'''
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Command line argument processing
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'''
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parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on libcloud supported providers')
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parser.add_argument('--list', action='store_true', default=True,
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help='List instances (default: True)')
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parser.add_argument('--host', action='store',
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help='Get all the variables about a specific instance')
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parser.add_argument('--refresh-cache', action='store_true', default=False,
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help='Force refresh of cache by making API requests to libcloud supported providers (default: False - use cache files)')
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self.args = parser.parse_args()
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def do_api_calls_update_cache(self):
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'''
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Do API calls to a location, and save data in cache files
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'''
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self.get_nodes()
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self.write_to_cache(self.inventory, self.cache_path_cache)
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self.write_to_cache(self.index, self.cache_path_index)
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def get_nodes(self):
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'''
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Gets the list of all nodes
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'''
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for node in self.conn.list_nodes():
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self.add_node(node)
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def get_node(self, node_id):
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'''
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Gets details about a specific node
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'''
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return [node for node in self.conn.list_nodes() if node.id == node_id][0]
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def add_node(self, node):
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'''
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Adds a node to the inventory and index, as long as it is
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addressable
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'''
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# Only want running instances
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if node.state != 0:
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return
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# Select the best destination address
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if not node.public_ips == []:
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dest = node.public_ips[0]
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if not dest:
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# Skip instances we cannot address (e.g. private VPC subnet)
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return
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# Add to index
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self.index[dest] = node.name
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# Inventory: Group by instance ID (always a group of 1)
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self.inventory[node.name] = [dest]
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'''
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# Inventory: Group by region
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self.push(self.inventory, region, dest)
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# Inventory: Group by availability zone
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self.push(self.inventory, node.placement, dest)
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# Inventory: Group by instance type
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self.push(self.inventory, self.to_safe('type_' + node.instance_type), dest)
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'''
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# Inventory: Group by key pair
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if node.extra['keyname']:
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self.push(self.inventory, self.to_safe('key_' + node.extra['keyname']), dest)
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# Inventory: Group by security group, quick thing to handle single sg
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if node.extra['securitygroup']:
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self.push(self.inventory, self.to_safe('sg_' + node.extra['securitygroup'][0]), dest)
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def get_host_info(self):
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'''
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Get variables about a specific host
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'''
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if len(self.index) == 0:
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# Need to load index from cache
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self.load_index_from_cache()
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if not self.args.host in self.index:
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# try updating the cache
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self.do_api_calls_update_cache()
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if not self.args.host in self.index:
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# host migh not exist anymore
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return self.json_format_dict({}, True)
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node_id = self.index[self.args.host]
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node = self.get_node(node_id)
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instance_vars = {}
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for key in vars(instance):
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value = getattr(instance, key)
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key = self.to_safe('ec2_' + key)
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# Handle complex types
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if type(value) in [int, bool]:
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instance_vars[key] = value
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elif type(value) in [str, unicode]:
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instance_vars[key] = value.strip()
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elif type(value) == type(None):
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instance_vars[key] = ''
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elif key == 'ec2_region':
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instance_vars[key] = value.name
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elif key == 'ec2_tags':
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for k, v in value.iteritems():
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key = self.to_safe('ec2_tag_' + k)
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instance_vars[key] = v
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elif key == 'ec2_groups':
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group_ids = []
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group_names = []
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for group in value:
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group_ids.append(group.id)
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group_names.append(group.name)
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instance_vars["ec2_security_group_ids"] = ','.join(group_ids)
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instance_vars["ec2_security_group_names"] = ','.join(group_names)
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else:
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pass
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# TODO Product codes if someone finds them useful
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#print key
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#print type(value)
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#print value
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return self.json_format_dict(instance_vars, True)
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def push(self, my_dict, key, element):
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'''
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Pushed an element onto an array that may not have been defined in
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the dict
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'''
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if key in my_dict:
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my_dict[key].append(element);
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else:
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my_dict[key] = [element]
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def get_inventory_from_cache(self):
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'''
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Reads the inventory from the cache file and returns it as a JSON
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object
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'''
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cache = open(self.cache_path_cache, 'r')
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json_inventory = cache.read()
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return json_inventory
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def load_index_from_cache(self):
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'''
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Reads the index from the cache file sets self.index
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'''
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cache = open(self.cache_path_index, 'r')
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json_index = cache.read()
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self.index = json.loads(json_index)
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def write_to_cache(self, data, filename):
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'''
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Writes data in JSON format to a file
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'''
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json_data = self.json_format_dict(data, True)
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cache = open(filename, 'w')
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cache.write(json_data)
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cache.close()
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def to_safe(self, word):
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'''
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Converts 'bad' characters in a string to underscores so they can be
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used as Ansible groups
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'''
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return re.sub("[^A-Za-z0-9\-]", "_", word)
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def json_format_dict(self, data, pretty=False):
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'''
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Converts a dict to a JSON object and dumps it as a formatted
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string
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'''
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if pretty:
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return json.dumps(data, sort_keys=True, indent=2)
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else:
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return json.dumps(data)
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def main():
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LibcloudInventory()
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if __name__ == '__main__':
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main()
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15
plugins/inventory/libcloud.ini
Normal file
15
plugins/inventory/libcloud.ini
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@ -0,0 +1,15 @@
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# Ansible Apache Libcloud Generic inventory script
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[driver]
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provider = CLOUDSTACK
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host =
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path =
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secure = True
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verify_ssl_cert = True
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key =
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secret =
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[cache]
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cache_path=/path/to/your/cache
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cache_max_age=60
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