292 lines
11 KiB
Python
292 lines
11 KiB
Python
# Copyright 2010 OpenStack Foundation
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# Copyright 2013 Hewlett-Packard Development Company, L.P.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import abc
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import datetime
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import os
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import shutil
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from oslo_log import log
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from oslo_utils import importutils
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from oslo_utils import uuidutils
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import requests
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import sendfile
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import six
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from six.moves import http_client
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import six.moves.urllib.parse as urlparse
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from ironic.common import exception
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from ironic.common.i18n import _
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from ironic.common import utils
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from ironic.conf import CONF
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IMAGE_CHUNK_SIZE = 1024 * 1024 # 1mb
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LOG = log.getLogger(__name__)
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# TODO(pas-ha) in Queens change default to '2',
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# but keep the versioned import in place (less work for possible Glance v3)
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def GlanceImageService(client=None, version=None, context=None):
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module_str = 'ironic.common.glance_service'
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if version is None:
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version = CONF.glance.glance_api_version
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module = importutils.import_versioned_module(module_str, version,
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'image_service')
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service_class = getattr(module, 'GlanceImageService')
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return service_class(client, version, context)
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@six.add_metaclass(abc.ABCMeta)
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class BaseImageService(object):
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"""Provides retrieval of disk images."""
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@abc.abstractmethod
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def validate_href(self, image_href):
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"""Validate image reference.
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:param image_href: Image reference.
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:raises: exception.ImageRefValidationFailed.
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:returns: Information needed to further operate with an image.
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"""
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@abc.abstractmethod
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def download(self, image_href, image_file):
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"""Downloads image to specified location.
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:param image_href: Image reference.
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:param image_file: File object to write data to.
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:raises: exception.ImageRefValidationFailed.
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:raises: exception.ImageDownloadFailed.
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"""
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@abc.abstractmethod
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def show(self, image_href):
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"""Get dictionary of image properties.
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:param image_href: Image reference.
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:raises: exception.ImageRefValidationFailed.
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:returns: dictionary of image properties. It has three of them: 'size',
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'updated_at' and 'properties'. 'updated_at' attribute is a naive
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UTC datetime object.
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"""
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class HttpImageService(BaseImageService):
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"""Provides retrieval of disk images using HTTP."""
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def validate_href(self, image_href, secret=False):
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"""Validate HTTP image reference.
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:param image_href: Image reference.
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:param secret: Specify if image_href being validated should not be
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shown in exception message.
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:raises: exception.ImageRefValidationFailed if HEAD request failed or
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returned response code not equal to 200.
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:returns: Response to HEAD request.
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"""
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output_url = 'secreturl' if secret else image_href
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try:
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response = requests.head(image_href)
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if response.status_code != http_client.OK:
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raise exception.ImageRefValidationFailed(
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image_href=output_url,
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reason=_("Got HTTP code %s instead of 200 in response to "
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"HEAD request.") % response.status_code)
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except requests.RequestException as e:
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raise exception.ImageRefValidationFailed(image_href=output_url,
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reason=six.text_type(e))
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return response
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def download(self, image_href, image_file):
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"""Downloads image to specified location.
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:param image_href: Image reference.
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:param image_file: File object to write data to.
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:raises: exception.ImageRefValidationFailed if GET request returned
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response code not equal to 200.
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:raises: exception.ImageDownloadFailed if:
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* IOError happened during file write;
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* GET request failed.
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"""
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try:
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response = requests.get(image_href, stream=True)
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if response.status_code != http_client.OK:
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raise exception.ImageRefValidationFailed(
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image_href=image_href,
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reason=_("Got HTTP code %s instead of 200 in response to "
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"GET request.") % response.status_code)
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with response.raw as input_img:
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shutil.copyfileobj(input_img, image_file, IMAGE_CHUNK_SIZE)
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except (requests.RequestException, IOError) as e:
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raise exception.ImageDownloadFailed(image_href=image_href,
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reason=six.text_type(e))
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def show(self, image_href):
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"""Get dictionary of image properties.
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:param image_href: Image reference.
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:raises: exception.ImageRefValidationFailed if:
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* HEAD request failed;
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* HEAD request returned response code not equal to 200;
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* Content-Length header not found in response to HEAD request.
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:returns: dictionary of image properties. It has three of them: 'size',
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'updated_at' and 'properties'. 'updated_at' attribute is a naive
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UTC datetime object.
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"""
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response = self.validate_href(image_href)
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image_size = response.headers.get('Content-Length')
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if image_size is None:
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raise exception.ImageRefValidationFailed(
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image_href=image_href,
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reason=_("Cannot determine image size as there is no "
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"Content-Length header specified in response "
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"to HEAD request."))
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# Parse last-modified header to return naive datetime object
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str_date = response.headers.get('Last-Modified')
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date = None
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if str_date:
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http_date_format_strings = [
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'%a, %d %b %Y %H:%M:%S GMT', # RFC 822
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'%A, %d-%b-%y %H:%M:%S GMT', # RFC 850
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'%a %b %d %H:%M:%S %Y' # ANSI C
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]
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for fmt in http_date_format_strings:
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try:
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date = datetime.datetime.strptime(str_date, fmt)
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break
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except ValueError:
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continue
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return {
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'size': int(image_size),
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'updated_at': date,
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'properties': {}
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}
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class FileImageService(BaseImageService):
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"""Provides retrieval of disk images available locally on the conductor."""
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def validate_href(self, image_href):
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"""Validate local image reference.
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:param image_href: Image reference.
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:raises: exception.ImageRefValidationFailed if source image file
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doesn't exist.
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:returns: Path to image file if it exists.
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"""
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image_path = urlparse.urlparse(image_href).path
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if not os.path.isfile(image_path):
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raise exception.ImageRefValidationFailed(
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image_href=image_href,
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reason=_("Specified image file not found."))
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return image_path
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def download(self, image_href, image_file):
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"""Downloads image to specified location.
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:param image_href: Image reference.
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:param image_file: File object to write data to.
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:raises: exception.ImageRefValidationFailed if source image file
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doesn't exist.
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:raises: exception.ImageDownloadFailed if exceptions were raised while
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writing to file or creating hard link.
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"""
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source_image_path = self.validate_href(image_href)
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dest_image_path = image_file.name
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local_device = os.stat(dest_image_path).st_dev
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try:
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# We should have read and write access to source file to create
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# hard link to it.
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if (local_device == os.stat(source_image_path).st_dev and
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os.access(source_image_path, os.R_OK | os.W_OK)):
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image_file.close()
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os.remove(dest_image_path)
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os.link(source_image_path, dest_image_path)
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else:
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filesize = os.path.getsize(source_image_path)
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with open(source_image_path, 'rb') as input_img:
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sendfile.sendfile(image_file.fileno(), input_img.fileno(),
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0, filesize)
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except Exception as e:
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raise exception.ImageDownloadFailed(image_href=image_href,
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reason=six.text_type(e))
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def show(self, image_href):
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"""Get dictionary of image properties.
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:param image_href: Image reference.
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:raises: exception.ImageRefValidationFailed if image file specified
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doesn't exist.
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:returns: dictionary of image properties. It has three of them: 'size',
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'updated_at' and 'properties'. 'updated_at' attribute is a naive
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UTC datetime object.
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"""
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source_image_path = self.validate_href(image_href)
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return {
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'size': os.path.getsize(source_image_path),
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'updated_at': utils.unix_file_modification_datetime(
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source_image_path),
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'properties': {}
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}
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protocol_mapping = {
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'http': HttpImageService,
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'https': HttpImageService,
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'file': FileImageService,
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'glance': GlanceImageService,
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}
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def get_image_service(image_href, client=None, version=None, context=None):
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"""Get image service instance to download the image.
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:param image_href: String containing href to get image service for.
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:param client: Glance client to be used for download, used only if
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image_href is Glance href.
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:param version: Version of Glance API to use, used only if image_href is
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Glance href.
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:param context: request context, used only if image_href is Glance href.
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:raises: exception.ImageRefValidationFailed if no image service can
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handle specified href.
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:returns: Instance of an image service class that is able to download
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specified image.
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"""
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scheme = urlparse.urlparse(image_href).scheme.lower()
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if not scheme:
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if uuidutils.is_uuid_like(six.text_type(image_href)):
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cls = GlanceImageService
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else:
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raise exception.ImageRefValidationFailed(
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image_href=image_href,
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reason=_('Scheme-less image href is not a UUID.'))
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else:
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cls = protocol_mapping.get(scheme)
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if not cls:
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raise exception.ImageRefValidationFailed(
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image_href=image_href,
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reason=_('Image download protocol %s is not supported.'
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) % scheme)
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if cls == GlanceImageService:
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return cls(client, version, context)
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return cls()
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