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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/>.
from urlparse import (urlparse, urlunparse)
import json
import urllib
from cloudinit import log as logging
from cloudinit import util
LOG = logging.getLogger(__name__)
def combine_url(base, add_on):
base_parsed = list(urlparse(base))
path = base_parsed[2]
if path and not path.endswith("/"):
path += "/"
path += urllib.quote(str(add_on), safe="/:")
base_parsed[2] = path
return urlunparse(base_parsed)
# See: http://bit.ly/TyoUQs
#
# Since boto metadata reader uses the old urllib which does not
# support ssl, we need to ahead and create our own reader which
# works the same as the boto one (for now).
class MetadataMaterializer(object):
def __init__(self, blob, base_url, ssl_details):
self._blob = blob
self._md = None
self._base_url = base_url
self._ssl_details = ssl_details
def _parse(self, blob):
leaves = {}
children = []
if not blob:
return (leaves, children)
def has_children(item):
if item.endswith("/"):
return True
else:
return False
def get_name(item):
if item.endswith("/"):
return item.rstrip("/")
return item
for field in blob.splitlines():
field = field.strip()
field_name = get_name(field)
if not field or not field_name:
continue
if has_children(field):
if field_name not in children:
children.append(field_name)
else:
contents = field.split("=", 1)
resource = field_name
if len(contents) > 1:
# What a PITA...
(ident, sub_contents) = contents
checked_ident = util.safe_int(ident)
if checked_ident is not None:
resource = "%s/openssh-key" % (checked_ident)
field_name = sub_contents
leaves[field_name] = resource
return (leaves, children)
def materialize(self):
if self._md is not None:
return self._md
self._md = self._materialize(self._blob, self._base_url)
return self._md
def _fetch_url(self, url):
response = util.read_file_or_url(url, ssl_details=self._ssl_details)
return str(response)
def _decode_leaf_blob(self, blob):
if not blob:
return blob
stripped_blob = blob.strip()
if stripped_blob.startswith("{") and stripped_blob.endswith("}"):
# Assume and try with json
try:
return json.loads(blob)
except (ValueError, TypeError):
pass
if blob.find("\n") != -1:
return blob.splitlines()
return blob
def _materialize(self, blob, base_url):
(leaves, children) = self._parse(blob)
child_contents = {}
for c in children:
child_url = combine_url(base_url, c)
if not child_url.endswith("/"):
child_url += "/"
child_blob = self._fetch_url(child_url)
child_contents[c] = self._materialize(child_blob, child_url)
leaf_contents = {}
for (field, resource) in leaves.items():
leaf_url = combine_url(base_url, resource)
leaf_blob = self._fetch_url(leaf_url)
leaf_contents[field] = self._decode_leaf_blob(leaf_blob)
joined = {}
joined.update(child_contents)
for field in leaf_contents.keys():
if field in joined:
LOG.warn("Duplicate key found in results from %s", base_url)
else:
joined[field] = leaf_contents[field]
return joined
def get_instance_userdata(url, version='latest', ssl_details=None):
ud_url = combine_url(url, version)
ud_url = combine_url(ud_url, 'user-data')
try:
response = util.read_file_or_url(ud_url, ssl_details=ssl_details)
return str(response)
except Exception:
util.logexc(LOG, "Failed fetching userdata from url %s", ud_url)
return None
def get_instance_metadata(url, version='latest', ssl_details=None):
md_url = combine_url(url, version)
md_url = combine_url(md_url, 'meta-data')
try:
response = util.read_file_or_url(md_url, ssl_details=ssl_details)
materializer = MetadataMaterializer(str(response), md_url, ssl_details)
return materializer.materialize()
except Exception:
util.logexc(LOG, "Failed fetching metadata from url %s", md_url)
return None
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