265 lines
8.3 KiB
Python
265 lines
8.3 KiB
Python
# vi: ts=4 expandtab
|
|
#
|
|
# Copyright (C) 2012 Canonical Ltd.
|
|
# Copyright (C) 2012 Yahoo! Inc.
|
|
#
|
|
# Author: Scott Moser <scott.moser@canonical.com>
|
|
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License version 3, as
|
|
# published by the Free Software Foundation.
|
|
#
|
|
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
import errno
|
|
import oauth.oauth as oauth
|
|
import os
|
|
import time
|
|
import urllib2
|
|
|
|
from cloudinit import log as logging
|
|
from cloudinit import sources
|
|
from cloudinit import url_helper as uhelp
|
|
from cloudinit import util
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
MD_VERSION = "2012-03-01"
|
|
|
|
|
|
class DataSourceMAAS(sources.DataSource):
|
|
"""
|
|
DataSourceMAAS reads instance information from MAAS.
|
|
Given a config metadata_url, and oauth tokens, it expects to find
|
|
files under the root named:
|
|
instance-id
|
|
user-data
|
|
hostname
|
|
"""
|
|
def __init__(self, sys_cfg, distro, paths):
|
|
sources.DataSource.__init__(self, sys_cfg, distro, paths)
|
|
self.base_url = None
|
|
self.seed_dir = os.path.join(paths.seed_dir, 'maas')
|
|
|
|
def __str__(self):
|
|
return "%s [%s]" % (util.obj_name(self), self.base_url)
|
|
|
|
def get_data(self):
|
|
mcfg = self.ds_cfg
|
|
|
|
try:
|
|
(userdata, metadata) = read_maas_seed_dir(self.seed_dir)
|
|
self.userdata_raw = userdata
|
|
self.metadata = metadata
|
|
self.base_url = self.seed_dir
|
|
return True
|
|
except MAASSeedDirNone:
|
|
pass
|
|
except MAASSeedDirMalformed as exc:
|
|
LOG.warn("%s was malformed: %s" % (self.seed_dir, exc))
|
|
raise
|
|
|
|
# If there is no metadata_url, then we're not configured
|
|
url = mcfg.get('metadata_url', None)
|
|
if not url:
|
|
return False
|
|
|
|
try:
|
|
if not self.wait_for_metadata_service(url):
|
|
return False
|
|
|
|
self.base_url = url
|
|
|
|
(userdata, metadata) = read_maas_seed_url(self.base_url,
|
|
self.md_headers)
|
|
self.userdata_raw = userdata
|
|
self.metadata = metadata
|
|
return True
|
|
except Exception:
|
|
util.logexc(LOG, "Failed fetching metadata from url %s", url)
|
|
return False
|
|
|
|
def md_headers(self, url):
|
|
mcfg = self.ds_cfg
|
|
|
|
# If we are missing token_key, token_secret or consumer_key
|
|
# then just do non-authed requests
|
|
for required in ('token_key', 'token_secret', 'consumer_key'):
|
|
if required not in mcfg:
|
|
return {}
|
|
|
|
consumer_secret = mcfg.get('consumer_secret', "")
|
|
return oauth_headers(url=url,
|
|
consumer_key=mcfg['consumer_key'],
|
|
token_key=mcfg['token_key'],
|
|
token_secret=mcfg['token_secret'],
|
|
consumer_secret=consumer_secret)
|
|
|
|
def wait_for_metadata_service(self, url):
|
|
mcfg = self.ds_cfg
|
|
|
|
max_wait = 120
|
|
try:
|
|
max_wait = int(mcfg.get("max_wait", max_wait))
|
|
except Exception:
|
|
util.logexc(LOG, "Failed to get max wait. using %s", max_wait)
|
|
|
|
if max_wait == 0:
|
|
return False
|
|
|
|
timeout = 50
|
|
try:
|
|
if timeout in mcfg:
|
|
timeout = int(mcfg.get("timeout", timeout))
|
|
except Exception:
|
|
LOG.warn("Failed to get timeout, using %s" % timeout)
|
|
|
|
starttime = time.time()
|
|
check_url = "%s/%s/meta-data/instance-id" % (url, MD_VERSION)
|
|
urls = [check_url]
|
|
url = uhelp.wait_for_url(urls=urls, max_wait=max_wait,
|
|
timeout=timeout, status_cb=LOG.warn,
|
|
headers_cb=self.md_headers)
|
|
|
|
if url:
|
|
LOG.debug("Using metadata source: '%s'", url)
|
|
else:
|
|
LOG.critical("Giving up on md from %s after %i seconds",
|
|
urls, int(time.time() - starttime))
|
|
|
|
return bool(url)
|
|
|
|
|
|
def read_maas_seed_dir(seed_d):
|
|
"""
|
|
Return user-data and metadata for a maas seed dir in seed_d.
|
|
Expected format of seed_d are the following files:
|
|
* instance-id
|
|
* local-hostname
|
|
* user-data
|
|
"""
|
|
if not os.path.isdir(seed_d):
|
|
raise MAASSeedDirNone("%s: not a directory")
|
|
|
|
files = ('local-hostname', 'instance-id', 'user-data', 'public-keys')
|
|
md = {}
|
|
for fname in files:
|
|
try:
|
|
md[fname] = util.load_file(os.path.join(seed_d, fname))
|
|
except IOError as e:
|
|
if e.errno != errno.ENOENT:
|
|
raise
|
|
|
|
return check_seed_contents(md, seed_d)
|
|
|
|
|
|
def read_maas_seed_url(seed_url, header_cb=None, timeout=None,
|
|
version=MD_VERSION):
|
|
"""
|
|
Read the maas datasource at seed_url.
|
|
header_cb is a method that should return a headers dictionary that will
|
|
be given to urllib2.Request()
|
|
|
|
Expected format of seed_url is are the following files:
|
|
* <seed_url>/<version>/meta-data/instance-id
|
|
* <seed_url>/<version>/meta-data/local-hostname
|
|
* <seed_url>/<version>/user-data
|
|
"""
|
|
base_url = "%s/%s" % (seed_url, version)
|
|
file_order = [
|
|
'local-hostname',
|
|
'instance-id',
|
|
'public-keys',
|
|
'user-data',
|
|
]
|
|
files = {
|
|
'local-hostname': "%s/%s" % (base_url, 'meta-data/local-hostname'),
|
|
'instance-id': "%s/%s" % (base_url, 'meta-data/instance-id'),
|
|
'public-keys': "%s/%s" % (base_url, 'meta-data/public-keys'),
|
|
'user-data': "%s/%s" % (base_url, 'user-data'),
|
|
}
|
|
md = {}
|
|
for name in file_order:
|
|
url = files.get(name)
|
|
if header_cb:
|
|
headers = header_cb(url)
|
|
else:
|
|
headers = {}
|
|
try:
|
|
resp = uhelp.readurl(url, headers=headers, timeout=timeout)
|
|
if resp.ok():
|
|
md[name] = str(resp)
|
|
else:
|
|
LOG.warn(("Fetching from %s resulted in"
|
|
" an invalid http code %s"), url, resp.code)
|
|
except urllib2.HTTPError as e:
|
|
if e.code != 404:
|
|
raise
|
|
return check_seed_contents(md, seed_url)
|
|
|
|
|
|
def check_seed_contents(content, seed):
|
|
"""Validate if content is Is the content a dict that is valid as a
|
|
return for a datasource.
|
|
Either return a (userdata, metadata) tuple or
|
|
Raise MAASSeedDirMalformed or MAASSeedDirNone
|
|
"""
|
|
md_required = ('instance-id', 'local-hostname')
|
|
if len(content) == 0:
|
|
raise MAASSeedDirNone("%s: no data files found" % seed)
|
|
|
|
found = list(content.keys())
|
|
missing = [k for k in md_required if k not in found]
|
|
if len(missing):
|
|
raise MAASSeedDirMalformed("%s: missing files %s" % (seed, missing))
|
|
|
|
userdata = content.get('user-data', "")
|
|
md = {}
|
|
for (key, val) in content.iteritems():
|
|
if key == 'user-data':
|
|
continue
|
|
md[key] = val
|
|
|
|
return (userdata, md)
|
|
|
|
|
|
def oauth_headers(url, consumer_key, token_key, token_secret, consumer_secret):
|
|
consumer = oauth.OAuthConsumer(consumer_key, consumer_secret)
|
|
token = oauth.OAuthToken(token_key, token_secret)
|
|
params = {
|
|
'oauth_version': "1.0",
|
|
'oauth_nonce': oauth.generate_nonce(),
|
|
'oauth_timestamp': int(time.time()),
|
|
'oauth_token': token.key,
|
|
'oauth_consumer_key': consumer.key,
|
|
}
|
|
req = oauth.OAuthRequest(http_url=url, parameters=params)
|
|
req.sign_request(oauth.OAuthSignatureMethod_PLAINTEXT(),
|
|
consumer, token)
|
|
return req.to_header()
|
|
|
|
|
|
class MAASSeedDirNone(Exception):
|
|
pass
|
|
|
|
|
|
class MAASSeedDirMalformed(Exception):
|
|
pass
|
|
|
|
|
|
# Used to match classes to dependencies
|
|
datasources = [
|
|
(DataSourceMAAS, (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)
|