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327 lines
11 KiB
Python
Executable file
327 lines
11 KiB
Python
Executable file
#!/usr/bin/env python
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'''
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Linode 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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Linode using the Chube library.
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NOTE: This script assumes Ansible is being executed where Chube is already
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installed and has a valid config at ~/.chube. If not, run:
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pip install chube
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echo -e "---\napi_key: <YOUR API KEY GOES HERE>" > ~/.chube
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For more details, see: https://github.com/exosite/chube
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NOTE: This script also assumes that the Linodes in your account all have
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labels that correspond to hostnames that are in your resolver search path.
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Your resolver search path resides in /etc/hosts.
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When run against a specific host, this script returns the following variables:
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- api_id
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- datacenter_id
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- datacenter_city (lowercase city name of data center, e.g. 'tokyo')
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- label
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- display_group
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- create_dt
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- total_hd
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- total_xfer
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- total_ram
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- status
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- public_ip (The first public IP found)
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- private_ip (The first private IP found, or empty string if none)
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- alert_cpu_enabled
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- alert_cpu_threshold
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- alert_diskio_enabled
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- alert_diskio_threshold
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- alert_bwin_enabled
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- alert_bwin_threshold
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- alert_bwout_enabled
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- alert_bwout_threshold
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- alert_bwquota_enabled
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- alert_bwquota_threshold
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- backup_weekly_daily
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- backup_window
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- watchdog
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Peter Sankauskas did most of the legwork here with his linode plugin; I
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just adapted that for Linode.
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'''
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# (c) 2013, Dan Slimmon
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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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# Standard imports
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import os
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import re
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import sys
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import argparse
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from time import time
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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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try:
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from chube import load_chube_config
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from chube import api as chube_api
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from chube.datacenter import Datacenter
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from chube.linode_obj import Linode
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except:
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try:
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# remove local paths and other stuff that may
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# cause an import conflict, as chube is sensitive
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# to name collisions on importing
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old_path = sys.path
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sys.path = [d for d in sys.path if d not in ('', os.getcwd(), os.path.dirname(os.path.realpath(__file__)))]
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from chube import load_chube_config
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from chube import api as chube_api
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from chube.datacenter import Datacenter
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from chube.linode_obj import Linode
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sys.path = old_path
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except Exception as e:
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raise Exception("could not import chube")
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load_chube_config()
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# Imports for ansible
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import ConfigParser
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class LinodeInventory(object):
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def __init__(self):
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"""Main execution path."""
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# Inventory grouped by display group
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self.inventory = {}
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# Index of label to Linode ID
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self.index = {}
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# Local cache of Datacenter objects populated by populate_datacenter_cache()
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self._datacenter_cache = None
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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 nodes 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 file has 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 .ini file."""
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config = ConfigParser.SafeConfigParser()
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config.read(os.path.dirname(os.path.realpath(__file__)) + '/linode.ini')
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# Cache related
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cache_path = config.get('linode', 'cache_path')
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self.cache_path_cache = cache_path + "/ansible-linode.cache"
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self.cache_path_index = cache_path + "/ansible-linode.index"
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self.cache_max_age = config.getint('linode', 'cache_max_age')
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def parse_cli_args(self):
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"""Command line argument processing"""
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parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on Linode')
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parser.add_argument('--list', action='store_true', default=True,
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help='List nodes (default: True)')
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parser.add_argument('--host', action='store',
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help='Get all the variables about a specific node')
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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 Linode (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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"""Do API calls, and save data in cache files."""
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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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"""Makes an Linode API call to get the list of nodes."""
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try:
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for node in Linode.search(status=Linode.STATUS_RUNNING):
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self.add_node(node)
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except chube_api.linode_api.ApiError as e:
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sys.exit("Looks like Linode's API is down:\n %s" % e)
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def get_node(self, linode_id):
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"""Gets details about a specific node."""
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try:
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return Linode.find(api_id=linode_id)
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except chube_api.linode_api.ApiError as e:
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sys.exit("Looks like Linode's API is down:\n%" % e)
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def populate_datacenter_cache(self):
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"""Creates self._datacenter_cache, containing all Datacenters indexed by ID."""
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self._datacenter_cache = {}
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dcs = Datacenter.search()
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for dc in dcs:
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self._datacenter_cache[dc.api_id] = dc
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def get_datacenter_city(self, node):
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"""Returns a the lowercase city name of the node's data center."""
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if self._datacenter_cache is None:
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self.populate_datacenter_cache()
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location = self._datacenter_cache[node.datacenter_id].location
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location = location.lower()
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location = location.split(",")[0]
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return location
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def add_node(self, node):
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"""Adds an node to the inventory and index."""
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dest = node.label
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# Add to index
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self.index[dest] = node.api_id
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# Inventory: Group by node ID (always a group of 1)
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self.inventory[node.api_id] = [dest]
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# Inventory: Group by datacenter city
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self.push(self.inventory, self.get_datacenter_city(node), dest)
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# Inventory: Group by dipslay group
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self.push(self.inventory, node.display_group, dest)
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def get_host_info(self):
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"""Get variables about a specific host."""
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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 might 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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node_vars = {}
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for direct_attr in [
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"api_id",
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"datacenter_id",
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"label",
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"display_group",
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"create_dt",
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"total_hd",
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"total_xfer",
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"total_ram",
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"status",
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"alert_cpu_enabled",
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"alert_cpu_threshold",
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"alert_diskio_enabled",
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"alert_diskio_threshold",
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"alert_bwin_enabled",
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"alert_bwin_threshold",
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"alert_bwout_enabled",
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"alert_bwout_threshold",
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"alert_bwquota_enabled",
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"alert_bwquota_threshold",
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"backup_weekly_daily",
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"backup_window",
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"watchdog"
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]:
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node_vars[direct_attr] = getattr(node, direct_attr)
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node_vars["datacenter_city"] = self.get_datacenter_city(node)
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node_vars["public_ip"] = [addr.address for addr in node.ipaddresses if addr.is_public][0]
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# Set the SSH host information, so these inventory items can be used if
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# their labels aren't FQDNs
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node_vars['ansible_ssh_host'] = node_vars["public_ip"]
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node_vars['ansible_host'] = node_vars["public_ip"]
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private_ips = [addr.address for addr in node.ipaddresses if not addr.is_public]
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if private_ips:
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node_vars["private_ip"] = private_ips[0]
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return self.json_format_dict(node_vars, True)
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def push(self, my_dict, key, element):
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"""Pushed an element onto an array that may not have been defined in the dict."""
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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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"""Reads the inventory from the cache file and returns it as a JSON object."""
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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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"""Reads the index from the cache file and sets self.index."""
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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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"""Writes data in JSON format to a file."""
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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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"""Escapes any characters that would be invalid in an ansible group name."""
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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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"""Converts a dict to a JSON object and dumps it as a formatted string."""
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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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LinodeInventory()
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