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# Author: Vaidas Jablonskis <jablonskis@gmail.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
from base64 import b64decode
from cloudinit import log as logging
from cloudinit import sources
from cloudinit import url_helper
from cloudinit import util
LOG = logging.getLogger(__name__)
BUILTIN_DS_CONFIG = {
'metadata_url': 'http://metadata.google.internal/computeMetadata/v1/'
}
REQUIRED_FIELDS = ('instance-id', 'availability-zone', 'local-hostname')
class GoogleMetadataFetcher(object):
headers = {'X-Google-Metadata-Request': 'True'}
def __init__(self, metadata_address):
self.metadata_address = metadata_address
def get_value(self, path, is_text):
value = None
try:
resp = url_helper.readurl(url=self.metadata_address + path,
headers=self.headers)
except url_helper.UrlError as exc:
msg = "url %s raised exception %s"
LOG.debug(msg, path, exc)
else:
if resp.code == 200:
if is_text:
value = util.decode_binary(resp.contents)
else:
value = resp.contents
else:
LOG.debug("url %s returned code %s", path, resp.code)
return value
class DataSourceGCE(sources.DataSource):
def __init__(self, sys_cfg, distro, paths):
sources.DataSource.__init__(self, sys_cfg, distro, paths)
self.metadata = dict()
self.ds_cfg = util.mergemanydict([
util.get_cfg_by_path(sys_cfg, ["datasource", "GCE"], {}),
BUILTIN_DS_CONFIG])
self.metadata_address = self.ds_cfg['metadata_url']
# GCE takes sshKeys attribute in the format of '<user>:<public_key>'
# so we have to trim each key to remove the username part
def _trim_key(self, public_key):
try:
index = public_key.index(':')
if index > 0:
return public_key[(index + 1):]
except Exception:
return public_key
def get_data(self):
# url_map: (our-key, path, required, is_text)
url_map = [
('instance-id', ('instance/id',), True, True),
('availability-zone', ('instance/zone',), True, True),
('local-hostname', ('instance/hostname',), True, True),
('public-keys', ('project/attributes/sshKeys',
'instance/attributes/sshKeys'), False, True),
('user-data', ('instance/attributes/user-data',), False, False),
('user-data-encoding', ('instance/attributes/user-data-encoding',),
False, True),
]
# if we cannot resolve the metadata server, then no point in trying
if not util.is_resolvable_url(self.metadata_address):
LOG.debug("%s is not resolvable", self.metadata_address)
return False
metadata_fetcher = GoogleMetadataFetcher(self.metadata_address)
# iterate over url_map keys to get metadata items
running_on_gce = False
for (mkey, paths, required, is_text) in url_map:
value = None
for path in paths:
new_value = metadata_fetcher.get_value(path, is_text)
if new_value is not None:
value = new_value
if value:
running_on_gce = True
if required and value is None:
msg = "required key %s returned nothing. not GCE"
if not running_on_gce:
LOG.debug(msg, mkey)
else:
LOG.warn(msg, mkey)
return False
self.metadata[mkey] = value
if self.metadata['public-keys']:
lines = self.metadata['public-keys'].splitlines()
self.metadata['public-keys'] = [self._trim_key(k) for k in lines]
if self.metadata['availability-zone']:
self.metadata['availability-zone'] = self.metadata[
'availability-zone'].split('/')[-1]
encoding = self.metadata.get('user-data-encoding')
if encoding:
if encoding == 'base64':
self.metadata['user-data'] = b64decode(
self.metadata['user-data'])
else:
LOG.warn('unknown user-data-encoding: %s, ignoring', encoding)
return running_on_gce
@property
def launch_index(self):
# GCE does not provide lauch_index property
return None
def get_instance_id(self):
return self.metadata['instance-id']
def get_public_ssh_keys(self):
return self.metadata['public-keys']
def get_hostname(self, fqdn=False, resolve_ip=False):
# GCE has long FDQN's and has asked for short hostnames
return self.metadata['local-hostname'].split('.')[0]
def get_userdata_raw(self):
return self.metadata['user-data']
@property
def availability_zone(self):
return self.metadata['availability-zone']
@property
def region(self):
return self.availability_zone.rsplit('-', 1)[0]
# Used to match classes to dependencies
datasources = [
(DataSourceGCE, (sources.DEP_FILESYSTEM, sources.DEP_NETWORK)),
]
# Return a list of data sources that match this set of dependencies
def get_datasource_list(depends):
return sources.list_from_depends(depends, datasources)
# vi: ts=4 expandtab
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