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ansible/plugins/inventory/digital_ocean.py
Aleksey Zhukov 3861597696 Bring back cache
2015-05-13 18:12:48 +03:00

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#!/usr/bin/env python
'''
DigitalOcean external inventory script
======================================
Generates Ansible inventory of DigitalOcean Droplets.
In addition to the --list and --host options used by Ansible, there are options
for generating JSON of other DigitalOcean data. This is useful when creating
droplets. For example, --regions will return all the DigitalOcean Regions.
This information can also be easily found in the cache file, whose default
location is /tmp/ansible-digital_ocean.cache).
The --pretty (-p) option pretty-prints the output for better human readability.
----
Although the cache stores all the information received from DigitalOcean,
the cache is not used for current droplet information (in --list, --host,
--all, and --droplets). This is so that accurate droplet information is always
found. You can force this script to use the cache with --force-cache.
----
Configuration is read from `digital_ocean.ini`, then from environment variables,
then and command-line arguments.
Most notably, the DigitalOcean API Token must be specified. It can be specified
in the INI file or with the following environment variables:
export DO_API_TOKEN='abc123' or
export DO_API_KEY='abc123'
Alternatively, it can be passed on the command-line with --api-token.
If you specify DigitalOcean credentials in the INI file, a handy way to
get them into your environment (e.g., to use the digital_ocean module)
is to use the output of the --env option with export:
export $(digital_ocean.py --env)
----
The following groups are generated from --list:
- ID (droplet ID)
- NAME (droplet NAME)
- image_ID
- image_NAME
- distro_NAME (distribution NAME from image)
- region_NAME
- size_NAME
- status_STATUS
When run against a specific host, this script returns the following variables:
- do_backup_ids
- do_created_at
- do_disk
- do_features - list
- do_id
- do_image - object
- do_ip_address
- do_kernel - object
- do_locked
- de_memory
- do_name
- do_networks - object
- do_next_backup_window
- do_region - object
- do_size - object
- do_size_slug
- do_snapshot_ids - list
- do_status
- do_vcpus
-----
```
usage: digital_ocean.py [-h] [--list] [--host HOST] [--all]
[--droplets] [--regions] [--images] [--sizes]
[--ssh-keys] [--domains] [--pretty]
[--cache-path CACHE_PATH]
[--cache-max_age CACHE_MAX_AGE]
[--force-cache]
[--refresh-cache]
[--api-token API_TOKEN]
Produce an Ansible Inventory file based on DigitalOcean credentials
optional arguments:
-h, --help show this help message and exit
--list List all active Droplets as Ansible inventory
(default: True)
--host HOST Get all Ansible inventory variables about a specific
Droplet
--all List all DigitalOcean information as JSON
--droplets List Droplets as JSON
--regions List Regions as JSON
--images List Images as JSON
--sizes List Sizes as JSON
--ssh-keys List SSH keys as JSON
--domains List Domains as JSON
--pretty, -p Pretty-print results
--cache-path CACHE_PATH
Path to the cache files (default: .)
--cache-max_age CACHE_MAX_AGE
Maximum age of the cached items (default: 0)
--force-cache Only use data from the cache
--refresh-cache Force refresh of cache by making API requests to
DigitalOcean (default: False - use cache files)
--api-token API_TOKEN, -a API_TOKEN
DigitalOcean API Token
```
'''
# (c) 2013, Evan Wies <evan@neomantra.net>
#
# Inspired by the EC2 inventory plugin:
# https://github.com/ansible/ansible/blob/devel/plugins/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/>.
######################################################################
import os
import sys
import re
import argparse
from time import time
import ConfigParser
try:
import json
except ImportError:
import simplejson as json
try:
from dopy.manager import DoError, DoManager
except ImportError, e:
print "failed=True msg='`dopy` library required for this script'"
sys.exit(1)
class DigitalOceanInventory(object):
###########################################################################
# Main execution path
###########################################################################
def __init__(self):
''' Main execution path '''
# DigitalOceanInventory data
self.data = {} # All DigitalOcean data
self.inventory = {} # Ansible Inventory
# Define defaults
self.cache_path = '.'
self.cache_max_age = 0
# Read settings, environment variables, and CLI arguments
self.read_settings()
self.read_environment()
self.read_cli_args()
# Verify credentials were set
if not hasattr(self, 'api_token'):
print '''Could not find values for DigitalOcean api_token.
They must be specified via either ini file, command line argument (--api-token),
or environment variables (DO_API_TOKEN)'''
sys.exit(-1)
# env command, show DigitalOcean credentials
if self.args.env:
print "DO_API_TOKEN=%s" % self.api_token
sys.exit(0)
# Manage cache
self.cache_filename = self.cache_path + "/ansible-digital_ocean.cache"
self.cache_refreshed = False
if self.is_cache_valid:
self.load_from_cache()
if len(self.data) == 0:
if self.args.force_cache:
print '''Cache is empty and --force-cache was specified'''
sys.exit(-1)
self.manager = DoManager(None, self.api_token, api_version=2)
# Pick the json_data to print based on the CLI command
if self.args.droplets:
self.load_from_digital_ocean('droplets')
json_data = {'droplets': self.data['droplets']}
elif self.args.regions:
self.load_from_digital_ocean('regions')
json_data = {'regions': self.data['regions']}
elif self.args.images:
self.load_from_digital_ocean('images')
json_data = {'images': self.data['images']}
elif self.args.sizes:
self.load_from_digital_ocean('sizes')
json_data = {'sizes': self.data['sizes']}
elif self.args.ssh_keys:
self.load_from_digital_ocean('ssh_keys')
json_data = {'ssh_keys': self.data['ssh_keys']}
elif self.args.domains:
self.load_from_digital_ocean('domains')
json_data = {'domains': self.data['domains']}
elif self.args.all:
self.load_from_digital_ocean()
json_data = self.data
elif self.args.host:
json_data = self.load_droplet_variables_for_host()
else: # '--list' this is last to make it default
self.load_from_digital_ocean('droplets')
self.build_inventory()
json_data = self.inventory
if self.args.pretty:
print json.dumps(json_data, sort_keys=True, indent=2)
else:
print json.dumps(json_data)
# That's all she wrote...
###########################################################################
# Script configuration
###########################################################################
def read_settings(self):
''' Reads the settings from the digital_ocean.ini file '''
config = ConfigParser.SafeConfigParser()
config.read(os.path.dirname(os.path.realpath(__file__)) + '/digital_ocean.ini')
# Credentials
if config.has_option('digital_ocean', 'api_token'):
self.api_token = config.get('digital_ocean', 'api_token')
# Cache related
if config.has_option('digital_ocean', 'cache_path'):
self.cache_path = config.get('digital_ocean', 'cache_path')
if config.has_option('digital_ocean', 'cache_max_age'):
self.cache_max_age = config.getint('digital_ocean', 'cache_max_age')
def read_environment(self):
''' Reads the settings from environment variables '''
# Setup credentials
if os.getenv("DO_API_TOKEN"):
self.api_token = os.getenv("DO_API_TOKEN")
if os.getenv("DO_API_KEY"):
self.api_token = os.getenv("DO_API_KEY")
def read_cli_args(self):
''' Command line argument processing '''
parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on DigitalOcean credentials')
parser.add_argument('--list', action='store_true', help='List all active Droplets as Ansible inventory (default: True)')
parser.add_argument('--host', action='store', help='Get all Ansible inventory variables about a specific Droplet')
parser.add_argument('--all', action='store_true', help='List all DigitalOcean information as JSON')
parser.add_argument('--droplets','-d', action='store_true', help='List Droplets as JSON')
parser.add_argument('--regions', action='store_true', help='List Regions as JSON')
parser.add_argument('--images', action='store_true', help='List Images as JSON')
parser.add_argument('--sizes', action='store_true', help='List Sizes as JSON')
parser.add_argument('--ssh-keys', action='store_true', help='List SSH keys as JSON')
parser.add_argument('--domains', action='store_true',help='List Domains as JSON')
parser.add_argument('--pretty','-p', action='store_true', help='Pretty-print results')
parser.add_argument('--cache-path', action='store', help='Path to the cache files (default: .)')
parser.add_argument('--cache-max_age', action='store', help='Maximum age of the cached items (default: 0)')
parser.add_argument('--force-cache', action='store_true', default=False, help='Only use data from the cache')
parser.add_argument('--refresh-cache','-r', action='store_true', default=False,
help='Force refresh of cache by making API requests to DigitalOcean (default: False - use cache files)')
parser.add_argument('--env','-e', action='store_true', help='Display DO_API_TOKEN')
parser.add_argument('--api-token','-a', action='store', help='DigitalOcean API Token')
self.args = parser.parse_args()
if self.args.api_token:
self.api_token = self.args.api_token
# Make --list default if none of the other commands are specified
if (not self.args.droplets and not self.args.regions and
not self.args.images and not self.args.sizes and
not self.args.ssh_keys and not self.args.domains and
not self.args.all and not self.args.host):
self.args.list = True
###########################################################################
# Data Management
###########################################################################
def load_from_digital_ocean(self, resource=None):
'''Get JSON from DigitalOcean API'''
if self.args.force_cache:
return
if self.args.refresh_cache:
resource=None
if resource == 'droplets' or resource is None:
self.data['droplets'] = self.manager.all_active_droplets()
if resource == 'regions' or resource is None:
self.data['regions'] = self.manager.all_regions()
if resource == 'images' or resource is None:
self.data['images'] = self.manager.all_images(filter=None)
if resource == 'sizes' or resource is None:
self.data['sizes'] = self.manager.sizes()
if resource == 'ssh_keys' or resource is None:
self.data['ssh_keys'] = self.manager.all_ssh_keys()
if resource == 'domains' or resource is None:
self.data['domains'] = self.manager.all_domains()
self.write_to_cache()
def build_inventory(self):
'''Build Ansible inventory of droplets'''
self.inventory = {}
# add all droplets by id and name
for droplet in self.data['droplets']:
dest = droplet['ip_address']
self.inventory[droplet['id']] = [dest]
self.push(self.inventory, droplet['name'], dest)
self.push(self.inventory, 'region_' + droplet['region']['slug'], dest)
self.push(self.inventory, 'image_' + str(droplet['image']['id']), dest)
self.push(self.inventory, 'size_' + droplet['size']['slug'], dest)
image_slug = droplet['image']['slug']
if image_slug:
self.push(self.inventory, 'image_' + self.to_safe(image_slug), dest)
else:
image_name = droplet['image']['name']
if image_name:
self.push(self.inventory, 'image_' + self.to_safe(image_name), dest)
self.push(self.inventory, 'distro_' + self.to_safe(droplet['image']['distribution']), dest)
self.push(self.inventory, 'status_' + droplet['status'], dest)
def load_droplet_variables_for_host(self):
'''Generate a JSON response to a --host call'''
host = int(self.args.host)
droplet = self.manager.show_droplet(host)
# Put all the information in a 'do_' namespace
info = {}
for k, v in droplet.items():
info['do_'+k] = v
return {'droplet': info}
###########################################################################
# Cache Management
###########################################################################
def is_cache_valid(self):
''' Determines if the cache files have expired, or if it is still valid '''
if os.path.isfile(self.cache_filename):
mod_time = os.path.getmtime(self.cache_filename)
current_time = time()
if (mod_time + self.cache_max_age) > current_time:
return True
return False
def load_from_cache(self):
''' Reads the data from the cache file and assigns it to member variables as Python Objects'''
try:
cache = open(self.cache_filename, 'r')
json_data = cache.read()
cache.close()
data = json.loads(json_data)
except IOError:
data = {'data': {}, 'inventory': {}}
self.data = data['data']
self.inventory = data['inventory']
def write_to_cache(self):
''' Writes data in JSON format to a file '''
data = { 'data': self.data, 'inventory': self.inventory }
json_data = json.dumps(data, sort_keys=True, indent=2)
cache = open(self.cache_filename, 'w')
cache.write(json_data)
cache.close()
###########################################################################
# Utilities
###########################################################################
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 to_safe(self, word):
''' Converts 'bad' characters in a string to underscores so they can be used as Ansible groups '''
return re.sub("[^A-Za-z0-9\-\.]", "_", word)
###########################################################################
# Run the script
DigitalOceanInventory()
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