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# vi: ts=4 expandtab
#
# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Hafliger <juerg.haefliger@hp.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 cloudinit.DataSource as DataSource
from cloudinit import seeddir as base_seeddir
from cloudinit import log
import cloudinit.util as util
import errno
import oauth.oauth as oauth
import os.path
import socket
import urllib2
import time
class DataSourceMaaS(DataSource.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
"""
seeddir = base_seeddir + '/maas'
baseurl = None
def __str__(self):
return("DataSourceMaaS[%s]" % self.baseurl)
def get_data(self):
mcfg = self.ds_cfg
try:
(userdata, metadata) = read_maas_seed_dir(self.seeddir)
self.userdata_raw = userdata
self.metadata = metadata
self.baseurl = self.seeddir
return True
except MaasSeedDirNone:
pass
except MaasSeedDirMalformed as exc:
log.warn("%s was malformed: %s\n" % (self.seeddir, exc))
raise
try:
# if there is no metadata_url, then we're not configured
url = mcfg.get('metadata_url', None)
if url == None:
return False
if not self.wait_for_metadata_service(url):
return False
self.baseurl = url
(userdata, metadata) = read_maas_seed_url(self.baseurl,
self.md_headers)
return True
except Exception:
util.logexc(log)
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)
log.warn("Failed to get max wait. using %s" % max_wait)
if max_wait == 0:
return False
timeout = 50
try:
timeout = int(mcfg.get("timeout", timeout))
except Exception:
util.logexc(log)
log.warn("Failed to get timeout, using %s" % timeout)
starttime = time.time()
check_url = "%s/instance-id" % url
url = util.wait_for_url(urls=[check_url], 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 after %i seconds\n" %
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
* hostname
* user-data
"""
md_required = set(('hostname', 'instance-id'))
files = md_required.union(set(('userdata',)))
userdata = None
md = {}
if not os.path.isdir(seed_d):
raise MaasSeedDirNone("%s: not a directory")
for fname in files:
try:
with open(os.path.join(seed_d, fname)) as fp:
if fname == 'userdata':
userdata = fp.read()
else:
md[fname] = fp.read()
fp.close()
except IOError as e:
if e.errno != errno.ENOENT:
raise
if userdata == None and len(md) == 0:
raise MaasSeedDirNone("%s: no data files found" % seed_d)
if userdata == None:
raise MaasSeedDirMalformed("%s: missing userdata" % seed_d)
missing = md_required - set(md.keys())
if len(missing):
raise MaasSeedDirMalformed("%s: missing files %s" %
(seed_d, str(missing)))
return(userdata, md)
def read_maas_seed_url(seed_url, header_cb=None):
"""
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>/instance-id
* <seed_url>/hostname
* <seed_url>/user-data
"""
userdata = ""
metadata = {'instance-id': 'i-maas-url', 'hostname': 'maas-url-hostname'}
return(userdata, metadata)
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
datasources = [
(DataSourceMaaS, (DataSource.DEP_FILESYSTEM, DataSource.DEP_NETWORK)),
]
# return a list of data sources that match this set of dependencies
def get_datasource_list(depends):
return(DataSource.list_from_depends(depends, datasources))
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