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# vi: ts=4 expandtab
#
# Copyright (C) 2012 Yahoo! Inc.
#
# 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 json
import urllib
from cloudinit import log as logging
from cloudinit import url_helper as uh
from cloudinit import util
LOG = logging.getLogger(__name__)
# For now take this and fix it...
class LazyLoadMetadata(dict):
def __init__(self, url, fetch_timeout, num_retries, ssl_details):
self._url = url
self._num_retries = num_retries
self._ssl_details = ssl_details
self._fetch_timeout = fetch_timeout
self._leaves = {}
self._dicts = []
response = uh.readurl(url, timeout=fetch_timeout,
retries=num_retries, ssl_details=ssl_details)
data = str(response)
if data:
fields = data.split('\n')
for field in fields:
if field.endswith('/'):
key = field[0:-1]
self._dicts.append(key)
else:
p = field.find('=')
if p > 0:
key = field[p + 1:]
resource = field[0:p] + '/openssh-key'
else:
key = resource = field
self._leaves[key] = resource
self[key] = None
def _materialize(self):
for key in self:
self[key]
def __getitem__(self, key):
if key not in self:
# Allow dict to throw the KeyError
return super(LazyLoadMetadata, self).__getitem__(key)
# Already loaded
val = super(LazyLoadMetadata, self).__getitem__(key)
if val is not None:
return val
if key in self._leaves:
resource = self._leaves[key]
new_url = self._url + urllib.quote(resource, safe="/:")
response = uh.readurl(new_url, retries=self._num_retries,
timeout=self._fetch_timeout,
ssl_details=self._ssl_details)
val = str(response)
if val and val[0] == '{':
val = json.loads(val)
else:
p = val.find('\n')
if p > 0:
val = val.split('\n')
self[key] = val
elif key in self._dicts:
new_url = self._url + key + '/'
self[key] = LazyLoadMetadata(new_url,
num_retries=self._num_retries,
fetch_timeout=self._fetch_timeout,
ssl_details=self._ssl_details)
return super(LazyLoadMetadata, self).__getitem__(key)
def get(self, key, default=None):
try:
return self[key]
except KeyError:
return default
def values(self):
self._materialize()
return super(LazyLoadMetadata, self).values()
def items(self):
self._materialize()
return super(LazyLoadMetadata, self).items()
def __str__(self):
self._materialize()
return super(LazyLoadMetadata, self).__str__()
def __repr__(self):
self._materialize()
return super(LazyLoadMetadata, self).__repr__()
def get_instance_userdata(url, version='latest', ssl_details=None):
ud_url = '%s/%s/user-data' % (url, version)
try:
response = uh.readurl(ud_url, timeout=5,
retries=10, ssl_details=ssl_details)
return str(response)
except Exception as e:
util.logexc(LOG, "Failed fetching url %s", ud_url)
return None
def get_instance_metadata(url, version='latest', ssl_details=None):
md_url = '%s/%s/meta-data' % (url, version)
try:
return LazyLoadMetadata(md_url, timeout=5,
retries=10, ssl_details=ssl_details)
except Exception as e:
util.logexc(LOG, "Failed fetching url %s", md_url)
return None
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