# Copyright (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = '''
name: gcp_compute
plugin_type: inventory
short_description: Google Cloud Compute Engine inventory source
requirements:
- requests >= 2.18.4
- google-auth >= 1.3.0
extends_documentation_fragment:
- constructed
- inventory_cache
description:
- Get inventory hosts from Google Cloud Platform GCE.
- Uses a YAML configuration file that ends with gcp_compute.(yml|yaml) or gcp.(yml|yaml).
options:
plugin:
description: token that ensures this is a source file for the 'gcp_compute' plugin.
required: True
choices: ['gcp_compute']
zones:
description: A list of regions in which to describe GCE instances.
If none provided, it defaults to all zones available to a given project.
type: list
projects:
description: A list of projects in which to describe GCE instances.
type: list
required: True
filters:
description: >
A list of filter value pairs. Available filters are listed here
U(https://cloud.google.com/compute/docs/reference/rest/v1/instances/list).
Each additional filter in the list will act be added as an AND condition
(filter1 and filter2)
type: list
hostnames:
description: A list of options that describe the ordering for which
hostnames should be assigned. Currently supported hostnames are
'public_ip', 'private_ip', or 'name'.
default: ['public_ip', 'private_ip', 'name']
type: list
auth_kind:
description:
- The type of credential used.
required: True
choices: ['application', 'serviceaccount', 'machineaccount']
scopes:
description: list of authentication scopes
type: list
default: ['https://www.googleapis.com/auth/compute']
service_account_file:
description:
- The path of a Service Account JSON file if serviceaccount is selected as type.
required: True
type: path
env:
- name: GCE_CREDENTIALS_FILE_PATH
version_added: "2.8"
service_account_email:
description:
- An optional service account email address if machineaccount is selected
and the user does not wish to use the default email.
vars_prefix:
description: prefix to apply to host variables, does not include facts nor params
default: ''
use_contrib_script_compatible_sanitization:
description:
- By default this plugin is using a general group name sanitization to create safe and usable group names for use in Ansible.
This option allows you to override that, in efforts to allow migration from the old inventory script.
- For this to work you should also turn off the TRANSFORM_INVALID_GROUP_CHARS setting,
otherwise the core engine will just use the standard sanitization on top.
- This is not the default as such names break certain functionality as not all characters are valid Python identifiers
which group names end up being used as.
type: bool
default: False
version_added: '2.8'
retrieve_image_info:
description:
- Populate the C(image) host fact for the instances returned with the GCP image name
- By default this plugin does not attempt to resolve the boot image of an instance to the image name cataloged in GCP
because of the performance overhead of the task.
- Unless this option is enabled, the C(image) host variable will be C(null)
type: bool
default: False
version_added: '2.8'
'''
EXAMPLES = '''
plugin: gcp_compute
zones: # populate inventory with instances in these regions
- us-east1-a
projects:
- gcp-prod-gke-100
- gcp-cicd-101
filters:
- machineType = n1-standard-1
- scheduling.automaticRestart = true AND machineType = n1-standard-1
service_account_file: /tmp/service_account.json
auth_kind: serviceaccount
scopes:
- 'https://www.googleapis.com/auth/cloud-platform'
- 'https://www.googleapis.com/auth/compute.readonly'
keyed_groups:
# Create groups from GCE labels
- prefix: gcp
key: labels
hostnames:
# List host by name instead of the default public ip
- name
compose:
# Set an inventory parameter to use the Public IP address to connect to the host
# For Private ip use "networkInterfaces[0].networkIP"
ansible_host: networkInterfaces[0].accessConfigs[0].natIP
'''
import json
from ansible.errors import AnsibleError, AnsibleParserError
from ansible.module_utils._text import to_native
from ansible.module_utils.gcp_utils import GcpSession, navigate_hash, GcpRequestException
from ansible.plugins.inventory import BaseInventoryPlugin, Constructable, Cacheable
# Mocking a module to reuse module_utils
class GcpMockModule(object):
def __init__(self, params):
self.params = params
def fail_json(self, *args, **kwargs):
raise AnsibleError(kwargs['msg'])
class InventoryModule(BaseInventoryPlugin, Constructable, Cacheable):
NAME = 'gcp_compute'
_instances = r"https://www.googleapis.com/compute/v1/projects/%s/zones/%s/instances"
def __init__(self):
super(InventoryModule, self).__init__()
self.group_prefix = 'gcp_'
def _populate_host(self, item):
'''
:param item: A GCP instance
'''
hostname = self._get_hostname(item)
self.inventory.add_host(hostname)
for key in item:
try:
self.inventory.set_variable(hostname, self.get_option('vars_prefix') + key, item[key])
except (ValueError, TypeError) as e:
self.display.warning("Could not set host info hostvar for %s, skipping %s: %s" % (hostname, key, to_native(e)))
self.inventory.add_child('all', hostname)
def verify_file(self, path):
'''
:param path: the path to the inventory config file
:return the contents of the config file
'''
if super(InventoryModule, self).verify_file(path):
if path.endswith(('gcp.yml', 'gcp.yaml')):
return True
elif path.endswith(('gcp_compute.yml', 'gcp_compute.yaml')):
return True
return False
def fetch_list(self, params, link, query):
'''
:param params: a dict containing all of the fields relevant to build URL
:param link: a formatted URL
:param query: a formatted query string
:return the JSON response containing a list of instances.
'''
response = self.auth_session.get(link, params={'filter': query})
return self._return_if_object(self.fake_module, response)
def _get_zones(self, project, config_data):
'''
:param config_data: dict of info from inventory file
:return an array of zones that this project has access to
'''
link = "https://www.googleapis.com/compute/v1/projects/%s/zones" % project
zones = []
zones_response = self.fetch_list(config_data, link, '')
for item in zones_response['items']:
zones.append(item['name'])
return zones
def _get_query_options(self, filters):
'''
:param config_data: contents of the inventory config file
:return A fully built query string
'''
if not filters:
return ''
if len(filters) == 1:
return filters[0]
else:
queries = []
for f in filters:
# For multiple queries, all queries should have ()
if f[0] != '(' and f[-1] != ')':
queries.append("(%s)" % ''.join(f))
else:
queries.append(f)
return ' '.join(queries)
def _return_if_object(self, module, response):
'''
:param module: A GcpModule
:param response: A Requests response object
:return JSON response
'''
# If not found, return nothing.
if response.status_code == 404:
return None
# If no content, return nothing.
if response.status_code == 204:
return None
try:
response.raise_for_status
result = response.json()
except getattr(json.decoder, 'JSONDecodeError', ValueError) as inst:
module.fail_json(msg="Invalid JSON response with error: %s" % inst)
except GcpRequestException as inst:
module.fail_json(msg="Network error: %s" % inst)
if navigate_hash(result, ['error', 'errors']):
module.fail_json(msg=navigate_hash(result, ['error', 'errors']))
if result['kind'] != 'compute#instanceList' and result['kind'] != 'compute#zoneList':
module.fail_json(msg="Incorrect result: {kind}".format(**result))
return result
def _format_items(self, items, project_disks):
'''
:param items: A list of hosts
'''
for host in items:
if 'zone' in host:
host['zone_selflink'] = host['zone']
host['zone'] = host['zone'].split('/')[-1]
if 'machineType' in host:
host['machineType_selflink'] = host['machineType']
host['machineType'] = host['machineType'].split('/')[-1]
if 'networkInterfaces' in host:
for network in host['networkInterfaces']:
if 'network' in network:
network['network'] = self._format_network_info(network['network'])
if 'subnetwork' in network:
network['subnetwork'] = self._format_network_info(network['subnetwork'])
host['project'] = host['selfLink'].split('/')[6]
host['image'] = self._get_image(host, project_disks)
return items
def _add_hosts(self, items, config_data, format_items=True, project_disks=None):
'''
:param items: A list of hosts
:param config_data: configuration data
:param format_items: format items or not
'''
if not items:
return
if format_items:
items = self._format_items(items, project_disks)
for host in items:
self._populate_host(host)
hostname = self._get_hostname(host)
self._set_composite_vars(self.get_option('compose'), host, hostname)
self._add_host_to_composed_groups(self.get_option('groups'), host, hostname)
self._add_host_to_keyed_groups(self.get_option('keyed_groups'), host, hostname)
def _format_network_info(self, address):
'''
:param address: A GCP network address
:return a dict with network shortname and region
'''
split = address.split('/')
region = ''
if 'global' in split:
region = 'global'
else:
region = split[8]
return {
'region': region,
'name': split[-1],
'selfLink': address
}
def _get_hostname(self, item):
'''
:param item: A host response from GCP
:return the hostname of this instance
'''
hostname_ordering = ['public_ip', 'private_ip', 'name']
if self.get_option('hostnames'):
hostname_ordering = self.get_option('hostnames')
for order in hostname_ordering:
name = None
if order == 'public_ip':
name = self._get_publicip(item)
elif order == 'private_ip':
name = self._get_privateip(item)
elif order == 'name':
name = item[u'name']
else:
raise AnsibleParserError("%s is not a valid hostname precedent" % order)
if name:
return name
raise AnsibleParserError("No valid name found for host")
def _get_publicip(self, item):
'''
:param item: A host response from GCP
:return the publicIP of this instance or None
'''
# Get public IP if exists
for interface in item['networkInterfaces']:
if 'accessConfigs' in interface:
for accessConfig in interface['accessConfigs']:
if 'natIP' in accessConfig:
return accessConfig[u'natIP']
return None
def _get_image(self, instance, project_disks):
'''
:param instance: A instance response from GCP
:return the image of this instance or None
'''
image = None
if project_disks and 'disks' in instance:
for disk in instance['disks']:
if disk.get('boot'):
image = project_disks[disk["source"]]
return image
def _get_project_disks(self, config_data, query):
'''
project space disk images
'''
try:
self._project_disks
except AttributeError:
self._project_disks = {}
request_params = {'maxResults': 500, 'filter': query}
for project in config_data['projects']:
session_responses = []
page_token = True
while page_token:
response = self.auth_session.get(
'https://www.googleapis.com/compute/v1/projects/{0}/aggregated/disks'.format(project),
params=request_params
)
response_json = response.json()
if 'nextPageToken' in response_json:
request_params['pageToken'] = response_json['nextPageToken']
elif 'pageToken' in request_params:
del request_params['pageToken']
if 'items' in response_json:
session_responses.append(response_json)
page_token = 'pageToken' in request_params
for response in session_responses:
if 'items' in response:
# example k would be a zone or region name
# example v would be { "disks" : [], "otherkey" : "..." }
for zone_or_region, aggregate in response['items'].items():
if 'zones' in zone_or_region:
if 'disks' in aggregate:
zone = zone_or_region.replace('zones/', '')
for disk in aggregate['disks']:
if 'zones' in config_data and zone in config_data['zones']:
# If zones specified, only store those zones' data
if 'sourceImage' in disk:
self._project_disks[disk['selfLink']] = disk['sourceImage'].split('/')[-1]
else:
self._project_disks[disk['selfLink']] = disk['selfLink'].split('/')[-1]
else:
if 'sourceImage' in disk:
self._project_disks[disk['selfLink']] = disk['sourceImage'].split('/')[-1]
else:
self._project_disks[disk['selfLink']] = disk['selfLink'].split('/')[-1]
return self._project_disks
def _get_privateip(self, item):
'''
:param item: A host response from GCP
:return the privateIP of this instance or None
'''
# Fallback: Get private IP
for interface in item[u'networkInterfaces']:
if 'networkIP' in interface:
return interface[u'networkIP']
def parse(self, inventory, loader, path, cache=True):
super(InventoryModule, self).parse(inventory, loader, path)
config_data = {}
config_data = self._read_config_data(path)
if self.get_option('use_contrib_script_compatible_sanitization'):
self._sanitize_group_name = self._legacy_script_compatible_group_sanitization
# setup parameters as expected by 'fake module class' to reuse module_utils w/o changing the API
params = {
'filters': self.get_option('filters'),
'projects': self.get_option('projects'),
'scopes': self.get_option('scopes'),
'zones': self.get_option('zones'),
'auth_kind': self.get_option('auth_kind'),
'service_account_file': self.get_option('service_account_file'),
'service_account_email': self.get_option('service_account_email'),
}
self.fake_module = GcpMockModule(params)
self.auth_session = GcpSession(self.fake_module, 'compute')
query = self._get_query_options(params['filters'])
if self.get_option('retrieve_image_info'):
project_disks = self._get_project_disks(config_data, query)
else:
project_disks = None
# Cache logic
if cache:
cache = self.get_option('cache')
cache_key = self.get_cache_key(path)
else:
cache_key = None
cache_needs_update = False
if cache:
try:
results = self._cache[cache_key]
for project in results:
for zone in results[project]:
self._add_hosts(results[project][zone], config_data, False, project_disks=project_disks)
except KeyError:
cache_needs_update = True
if not cache or cache_needs_update:
cached_data = {}
for project in params['projects']:
cached_data[project] = {}
params['project'] = project
if not params['zones']:
zones = self._get_zones(project, params)
else:
zones = params['zones']
for zone in zones:
link = self._instances % (project, zone)
params['zone'] = zone
resp = self.fetch_list(params, link, query)
self._add_hosts(resp.get('items'), config_data, project_disks=project_disks)
cached_data[project][zone] = resp.get('items')
if cache_needs_update:
self._cache[cache_key] = cached_data
@staticmethod
def _legacy_script_compatible_group_sanitization(name):
return name