/usr/share/pyshared/glance/store/http.py is in python-glance 2012.1.3+stable~20120821-120fcf-0ubuntu1.5.
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# Copyright 2010 OpenStack, LLC
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import httplib
import logging
import urlparse
from glance.common import exception
import glance.store.base
import glance.store.location
logger = logging.getLogger(__name__)
class StoreLocation(glance.store.location.StoreLocation):
"""Class describing an HTTP(S) URI"""
def process_specs(self):
self.scheme = self.specs.get('scheme', 'http')
self.netloc = self.specs['netloc']
self.user = self.specs.get('user')
self.password = self.specs.get('password')
self.path = self.specs.get('path')
def _get_credstring(self):
if self.user:
return '%s:%s@' % (self.user, self.password)
return ''
def get_uri(self):
return "%s://%s%s%s" % (
self.scheme,
self._get_credstring(),
self.netloc,
self.path)
def parse_uri(self, uri):
"""
Parse URLs. This method fixes an issue where credentials specified
in the URL are interpreted differently in Python 2.6.1+ than prior
versions of Python.
"""
pieces = urlparse.urlparse(uri)
assert pieces.scheme in ('https', 'http')
self.scheme = pieces.scheme
netloc = pieces.netloc
path = pieces.path
try:
if '@' in netloc:
creds, netloc = netloc.split('@')
else:
creds = None
except ValueError:
# Python 2.6.1 compat
# see lp659445 and Python issue7904
if '@' in path:
creds, path = path.split('@')
else:
creds = None
if creds:
try:
self.user, self.password = creds.split(':')
except ValueError:
reason = (_("Credentials '%s' not well-formatted.")
% "".join(creds))
logger.error(reason)
raise exception.BadStoreUri()
else:
self.user = None
if netloc == '':
reason = _("No address specified in HTTP URL")
logger.error(reason)
raise exception.BadStoreUri(reason)
self.netloc = netloc
self.path = path
def http_response_iterator(conn, response, size):
"""
Return an iterator for a file-like object.
:param conn: HTTP(S) Connection
:param response: httplib.HTTPResponse object
:param size: Chunk size to iterate with
"""
chunk = response.read(size)
while chunk:
yield chunk
chunk = response.read(size)
conn.close()
class Store(glance.store.base.Store):
"""An implementation of the HTTP(S) Backend Adapter"""
def get(self, location):
"""
Takes a `glance.store.location.Location` object that indicates
where to find the image file, and returns a tuple of generator
(for reading the image file) and image_size
:param location `glance.store.location.Location` object, supplied
from glance.store.location.get_location_from_uri()
"""
conn, resp, content_length = self._query(location, 'GET')
iterator = http_response_iterator(conn, resp, self.CHUNKSIZE)
class ResponseIndexable(glance.store.Indexable):
def another(self):
try:
return self.wrapped.next()
except StopIteration:
return ''
return (ResponseIndexable(iterator, content_length), content_length)
def get_size(self, location):
"""
Takes a `glance.store.location.Location` object that indicates
where to find the image file, and returns the size
:param location `glance.store.location.Location` object, supplied
from glance.store.location.get_location_from_uri()
"""
try:
return self._query(location, 'HEAD')[2]
except Exception:
return 0
def _query(self, location, verb):
loc = location.store_location
conn_class = self._get_conn_class(loc)
conn = conn_class(loc.netloc)
conn.request(verb, loc.path, "", {})
resp = conn.getresponse()
content_length = resp.getheader('content-length', 0)
return (conn, resp, content_length)
def _get_conn_class(self, loc):
"""
Returns connection class for accessing the resource. Useful
for dependency injection and stubouts in testing...
"""
return {'http': httplib.HTTPConnection,
'https': httplib.HTTPSConnection}[loc.scheme]
glance.store.register_store(__name__, ['http', 'https'])
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