#!/usr/bin/python
# Copyright 2013 Google Inc.
#
# 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/>.
'''
GCE external inventory script
=================================
Generates inventory that Ansible can understand by making API requests
Google Compute Engine via the libcloud library. Full install/configuration
instructions for the gce* modules can be found in the comments of
ansible/test/gce_tests.py.
When run against a specific host, this script returns the following variables
based on the data obtained from the libcloud Node object:
- gce_uuid
- gce_id
- gce_image
- gce_machine_type
- gce_private_ip
- gce_public_ip
- gce_name
- gce_description
- gce_status
- gce_zone
- gce_tags
- gce_metadata
- gce_network
When run in --list mode, instances are grouped by the following categories:
- zone:
zone group name examples are us-central1-b, europe-west1-a, etc.
- instance tags:
An entry is created for each tag. For example, if you have two instances
with a common tag called 'foo', they will both be grouped together under
the 'tag_foo' name.
- network name:
the name of the network is appended to 'network_' (e.g. the 'default'
network will result in a group named 'network_default')
- machine type
types follow a pattern like n1-standard-4, g1-small, etc.
- running status:
group name prefixed with 'status_' (e.g. status_running, status_stopped,..)
- image:
when using an ephemeral/scratch disk, this will be set to the image name
used when creating the instance (e.g. debian-7-wheezy-v20130816). when
your instance was created with a root persistent disk it will be set to
'persistent_disk' since there is no current way to determine the image.
Examples:
Execute uname on all instances in the us-central1-a zone
$ ansible -i gce.py us-central1-a -m shell -a "/bin/uname -a"
Use the GCE inventory script to print out instance specific information
$ plugins/inventory/gce.py --host my_instance
Author: Eric Johnson <erjohnso@google.com>
Version: 0.0.1
'''
USER_AGENT_PRODUCT="Ansible-gce_inventory_plugin"
USER_AGENT_VERSION="v1"
import sys
import os
import argparse
import ConfigParser
try:
import json
except ImportError:
import simplejson as json
try:
from libcloud.compute.types import Provider
from libcloud.compute.providers import get_driver
_ = Provider.GCE
except:
print("GCE inventory script requires libcloud >= 0.13")
sys.exit(1)
class GceInventory(object):
def __init__(self):
# Read settings and parse CLI arguments
self.parse_cli_args()
self.driver = self.get_gce_driver()
# Just display data for specific host
if self.args.host:
print self.json_format_dict(self.node_to_dict(
self.get_instance(self.args.host)))
sys.exit(0)
# Otherwise, assume user wants all instances grouped
print(self.json_format_dict(self.group_instances()))
sys.exit(0)
def get_gce_driver(self):
"""Determine the GCE authorization settings and return a
libcloud driver.
"""
gce_ini_default_path = os.path.join(
os.path.dirname(os.path.realpath(__file__)), "gce.ini")
gce_ini_path = os.environ.get('GCE_INI_PATH', gce_ini_default_path)
# Create a ConfigParser.
# This provides empty defaults to each key, so that environment
# variable configuration (as opposed to INI configuration) is able
# to work.
config = ConfigParser.SafeConfigParser(defaults={
'gce_service_account_email_address': '',
'gce_service_account_pem_file_path': '',
'gce_project_id': '',
'libcloud_secrets': '',
})
if 'gce' not in config.sections():
config.add_section('gce')
config.read(gce_ini_path)
# Attempt to get GCE params from a configuration file, if one
# exists.
secrets_path = config.get('gce', 'libcloud_secrets')
secrets_found = False
try:
import secrets
args = list(getattr(secrets, 'GCE_PARAMS', []))
kwargs = getattr(secrets, 'GCE_KEYWORD_PARAMS', {})
secrets_found = True
except:
pass
if not secrets_found and secrets_path:
if not secrets_path.endswith('secrets.py'):
err = "Must specify libcloud secrets file as "
err += "/absolute/path/to/secrets.py"
print(err)
sys.exit(1)
sys.path.append(os.path.dirname(secrets_path))
try:
import secrets
args = list(getattr(secrets, 'GCE_PARAMS', []))
kwargs = getattr(secrets, 'GCE_KEYWORD_PARAMS', {})
secrets_found = True
except:
pass
if not secrets_found:
args = [
config.get('gce','gce_service_account_email_address'),
config.get('gce','gce_service_account_pem_file_path')
]
kwargs = {'project': config.get('gce', 'gce_project_id')}
# If the appropriate environment variables are set, they override
# other configuration; process those into our args and kwargs.
args[0] = os.environ.get('GCE_EMAIL', args[0])
args[1] = os.environ.get('GCE_PEM_FILE_PATH', args[1])
kwargs['project'] = os.environ.get('GCE_PROJECT', kwargs['project'])
# Retrieve and return the GCE driver.
gce = get_driver(Provider.GCE)(*args, **kwargs)
gce.connection.user_agent_append(
'%s/%s' % (USER_AGENT_PRODUCT, USER_AGENT_VERSION),
)
return gce
def parse_cli_args(self):
''' Command line argument processing '''
parser = argparse.ArgumentParser(
description='Produce an Ansible Inventory file based on GCE')
parser.add_argument('--list', action='store_true', default=True,
help='List instances (default: True)')
parser.add_argument('--host', action='store',
help='Get all information about an instance')
self.args = parser.parse_args()
def node_to_dict(self, inst):
md = {}
if inst is None:
return {}
if inst.extra['metadata'].has_key('items'):
for entry in inst.extra['metadata']['items']:
md[entry['key']] = entry['value']
net = inst.extra['networkInterfaces'][0]['network'].split('/')[-1]
return {
'gce_uuid': inst.uuid,
'gce_id': inst.id,
'gce_image': inst.image,
'gce_machine_type': inst.size,
'gce_private_ip': inst.private_ips[0],
'gce_public_ip': inst.public_ips[0],
'gce_name': inst.name,
'gce_description': inst.extra['description'],
'gce_status': inst.extra['status'],
'gce_zone': inst.extra['zone'].name,
'gce_tags': inst.extra['tags'],
'gce_metadata': md,
'gce_network': net,
# Hosts don't have a public name, so we add an IP
'ansible_ssh_host': inst.public_ips[0]
}
def get_instance(self, instance_name):
'''Gets details about a specific instance '''
try:
return self.driver.ex_get_node(instance_name)
except Exception, e:
return None
def group_instances(self):
'''Group all instances'''
groups = {}
for node in self.driver.list_nodes():
name = node.name
zone = node.extra['zone'].name
if groups.has_key(zone): groups[zone].append(name)
else: groups[zone] = [name]
tags = node.extra['tags']
for t in tags:
tag = 'tag_%s' % t
if groups.has_key(tag): groups[tag].append(name)
else: groups[tag] = [name]
net = node.extra['networkInterfaces'][0]['network'].split('/')[-1]
net = 'network_%s' % net
if groups.has_key(net): groups[net].append(name)
else: groups[net] = [name]
machine_type = node.size
if groups.has_key(machine_type): groups[machine_type].append(name)
else: groups[machine_type] = [name]
image = node.image and node.image or 'persistent_disk'
if groups.has_key(image): groups[image].append(name)
else: groups[image] = [name]
status = node.extra['status']
stat = 'status_%s' % status.lower()
if groups.has_key(stat): groups[stat].append(name)
else: groups[stat] = [name]
return groups
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)
# Run the script
GceInventory()