649 lines
26 KiB
Python
649 lines
26 KiB
Python
# Copyright 2010 OpenStack Foundation
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# Copyright 2014 Red Hat, Inc.
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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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"""
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A simple filesystem-backed store
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"""
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import errno
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import hashlib
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import logging
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import os
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import stat
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import jsonschema
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from oslo_config import cfg
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from oslo_serialization import jsonutils
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from oslo_utils import encodeutils
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from oslo_utils import excutils
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from oslo_utils import units
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from six.moves import urllib
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import glance_store
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from glance_store import capabilities
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from glance_store.common import utils
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import glance_store.driver
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from glance_store import exceptions
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from glance_store import i18n
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import glance_store.location
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LOG = logging.getLogger(__name__)
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_ = i18n._
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_LE = i18n._LE
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_LW = i18n._LW
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_FILESYSTEM_CONFIGS = [
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cfg.StrOpt('filesystem_store_datadir',
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default='/var/lib/glance/images',
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help=_('Directory to which the Filesystem backend '
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'store writes images.')),
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cfg.MultiStrOpt('filesystem_store_datadirs',
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help=_("List of directories and its priorities to which "
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"the Filesystem backend store writes images.")),
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cfg.StrOpt('filesystem_store_metadata_file',
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help=_("The path to a file which contains the "
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"metadata to be returned with any location "
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"associated with this store. The file must "
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"contain a valid JSON object. The object should contain "
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"the keys 'id' and 'mountpoint'. The value for both "
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"keys should be 'string'.")),
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cfg.IntOpt('filesystem_store_file_perm',
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default=0,
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help=_("The required permission for created image file. "
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"In this way the user other service used, e.g. Nova, "
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"who consumes the image could be the exclusive member "
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"of the group that owns the files created. Assigning "
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"it less then or equal to zero means don't change the "
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"default permission of the file. This value will be "
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"decoded as an octal digit."))]
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MULTI_FILESYSTEM_METADATA_SCHEMA = {
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"type": "array",
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"items": {
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"type": "object",
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"properties": {
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"id": {"type": "string"},
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"mountpoint": {"type": "string"}
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},
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"required": ["id", "mountpoint"],
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}
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}
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class StoreLocation(glance_store.location.StoreLocation):
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"""Class describing a Filesystem URI."""
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def process_specs(self):
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self.scheme = self.specs.get('scheme', 'file')
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self.path = self.specs.get('path')
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def get_uri(self):
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return "file://%s" % self.path
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def parse_uri(self, uri):
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"""
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Parse URLs. This method fixes an issue where credentials specified
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in the URL are interpreted differently in Python 2.6.1+ than prior
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versions of Python.
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"""
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pieces = urllib.parse.urlparse(uri)
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assert pieces.scheme in ('file', 'filesystem')
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self.scheme = pieces.scheme
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path = (pieces.netloc + pieces.path).strip()
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if path == '':
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reason = _("No path specified in URI")
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LOG.info(reason)
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raise exceptions.BadStoreUri(message=reason)
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self.path = path
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class ChunkedFile(object):
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"""
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We send this back to the Glance API server as
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something that can iterate over a large file
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"""
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def __init__(self, filepath, offset=0, chunk_size=4096,
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partial_length=None):
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self.filepath = filepath
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self.chunk_size = chunk_size
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self.partial_length = partial_length
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self.partial = self.partial_length is not None
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self.fp = open(self.filepath, 'rb')
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if offset:
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self.fp.seek(offset)
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def __iter__(self):
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"""Return an iterator over the image file."""
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try:
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if self.fp:
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while True:
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if self.partial:
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size = min(self.chunk_size, self.partial_length)
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else:
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size = self.chunk_size
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chunk = self.fp.read(size)
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if chunk:
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yield chunk
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if self.partial:
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self.partial_length -= len(chunk)
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if self.partial_length <= 0:
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break
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else:
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break
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finally:
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self.close()
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def close(self):
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"""Close the internal file pointer"""
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if self.fp:
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self.fp.close()
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self.fp = None
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class Store(glance_store.driver.Store):
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_CAPABILITIES = (capabilities.BitMasks.READ_RANDOM |
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capabilities.BitMasks.WRITE_ACCESS |
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capabilities.BitMasks.DRIVER_REUSABLE)
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OPTIONS = _FILESYSTEM_CONFIGS
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READ_CHUNKSIZE = 64 * units.Ki
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WRITE_CHUNKSIZE = READ_CHUNKSIZE
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FILESYSTEM_STORE_METADATA = None
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def get_schemes(self):
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return ('file', 'filesystem')
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def _check_write_permission(self, datadir):
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"""
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Checks if directory created to write image files has
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write permission.
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:datadir is a directory path in which glance wites image files.
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:raise BadStoreConfiguration exception if datadir is read-only.
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"""
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if not os.access(datadir, os.W_OK):
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msg = (_("Permission to write in %s denied") % datadir)
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LOG.exception(msg)
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raise exceptions.BadStoreConfiguration(
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store_name="filesystem", reason=msg)
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def _set_exec_permission(self, datadir):
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"""
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Set the execution permission of owner-group and/or other-users to
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image directory if the image file which contained needs relevant
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access permissions.
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:datadir is a directory path in which glance writes image files.
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"""
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if self.conf.glance_store.filesystem_store_file_perm <= 0:
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return
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try:
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mode = os.stat(datadir)[stat.ST_MODE]
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perm = int(str(self.conf.glance_store.filesystem_store_file_perm),
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8)
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if perm & stat.S_IRWXO > 0:
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if not mode & stat.S_IXOTH:
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# chmod o+x
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mode |= stat.S_IXOTH
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os.chmod(datadir, mode)
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if perm & stat.S_IRWXG > 0:
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if not mode & stat.S_IXGRP:
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# chmod g+x
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os.chmod(datadir, mode | stat.S_IXGRP)
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except (IOError, OSError):
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LOG.warning(_LW("Unable to set execution permission of "
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"owner-group and/or other-users to datadir: %s")
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% datadir)
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def _create_image_directories(self, directory_paths):
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"""
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Create directories to write image files if
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it does not exist.
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:directory_paths is a list of directories belonging to glance store.
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:raise BadStoreConfiguration exception if creating a directory fails.
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"""
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for datadir in directory_paths:
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if os.path.exists(datadir):
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self._check_write_permission(datadir)
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self._set_exec_permission(datadir)
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else:
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msg = _("Directory to write image files does not exist "
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"(%s). Creating.") % datadir
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LOG.info(msg)
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try:
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os.makedirs(datadir)
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self._check_write_permission(datadir)
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self._set_exec_permission(datadir)
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except (IOError, OSError):
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if os.path.exists(datadir):
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# NOTE(markwash): If the path now exists, some other
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# process must have beat us in the race condition.
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# But it doesn't hurt, so we can safely ignore
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# the error.
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self._check_write_permission(datadir)
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self._set_exec_permission(datadir)
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continue
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reason = _("Unable to create datadir: %s") % datadir
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LOG.error(reason)
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raise exceptions.BadStoreConfiguration(
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store_name="filesystem", reason=reason)
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def _validate_metadata(self, metadata_file):
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"""Validate metadata against json schema.
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If metadata is valid then cache metadata and use it when
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creating new image.
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:param metadata_file: JSON metadata file path
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:raises: BadStoreConfiguration exception if metadata is not valid.
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"""
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try:
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with open(metadata_file, 'rb') as fptr:
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metadata = jsonutils.load(fptr)
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if isinstance(metadata, dict):
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# If metadata is of type dictionary
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# i.e. - it contains only one mountpoint
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# then convert it to list of dictionary.
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metadata = [metadata]
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# Validate metadata against json schema
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jsonschema.validate(metadata, MULTI_FILESYSTEM_METADATA_SCHEMA)
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glance_store.check_location_metadata(metadata)
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self.FILESYSTEM_STORE_METADATA = metadata
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except (jsonschema.exceptions.ValidationError,
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exceptions.BackendException, ValueError) as vee:
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err_msg = encodeutils.exception_to_unicode(vee)
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reason = _('The JSON in the metadata file %(file)s is '
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'not valid and it can not be used: '
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'%(vee)s.') % dict(file=metadata_file,
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vee=err_msg)
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LOG.error(reason)
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raise exceptions.BadStoreConfiguration(
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store_name="filesystem", reason=reason)
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except IOError as ioe:
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err_msg = encodeutils.exception_to_unicode(ioe)
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reason = _('The path for the metadata file %(file)s could '
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'not be accessed: '
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'%(ioe)s.') % dict(file=metadata_file,
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ioe=err_msg)
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LOG.error(reason)
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raise exceptions.BadStoreConfiguration(
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store_name="filesystem", reason=reason)
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def configure_add(self):
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"""
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Configure the Store to use the stored configuration options
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Any store that needs special configuration should implement
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this method. If the store was not able to successfully configure
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itself, it should raise `exceptions.BadStoreConfiguration`
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"""
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if not (self.conf.glance_store.filesystem_store_datadir
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or self.conf.glance_store.filesystem_store_datadirs):
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reason = (_("Specify at least 'filesystem_store_datadir' or "
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"'filesystem_store_datadirs' option"))
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LOG.error(reason)
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raise exceptions.BadStoreConfiguration(store_name="filesystem",
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reason=reason)
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if (self.conf.glance_store.filesystem_store_datadir and
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self.conf.glance_store.filesystem_store_datadirs):
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reason = (_("Specify either 'filesystem_store_datadir' or "
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"'filesystem_store_datadirs' option"))
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LOG.error(reason)
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raise exceptions.BadStoreConfiguration(store_name="filesystem",
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reason=reason)
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if self.conf.glance_store.filesystem_store_file_perm > 0:
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perm = int(str(self.conf.glance_store.filesystem_store_file_perm),
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8)
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if not perm & stat.S_IRUSR:
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reason = _LE("Specified an invalid "
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"'filesystem_store_file_perm' option which "
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"could make image file to be unaccessible by "
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"glance service.")
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LOG.error(reason)
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reason = _("Invalid 'filesystem_store_file_perm' option.")
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raise exceptions.BadStoreConfiguration(store_name="filesystem",
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reason=reason)
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self.multiple_datadirs = False
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directory_paths = set()
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if self.conf.glance_store.filesystem_store_datadir:
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self.datadir = self.conf.glance_store.filesystem_store_datadir
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directory_paths.add(self.datadir)
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else:
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self.multiple_datadirs = True
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self.priority_data_map = {}
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for datadir in self.conf.glance_store.filesystem_store_datadirs:
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(datadir_path,
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priority) = self._get_datadir_path_and_priority(datadir)
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priority_paths = self.priority_data_map.setdefault(
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int(priority), [])
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self._check_directory_paths(datadir_path, directory_paths,
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priority_paths)
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directory_paths.add(datadir_path)
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priority_paths.append(datadir_path)
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self.priority_list = sorted(self.priority_data_map,
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reverse=True)
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self._create_image_directories(directory_paths)
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metadata_file = self.conf.glance_store.filesystem_store_metadata_file
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if metadata_file:
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self._validate_metadata(metadata_file)
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def _check_directory_paths(self, datadir_path, directory_paths,
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priority_paths):
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"""
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Checks if directory_path is already present in directory_paths.
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:datadir_path is directory path.
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:datadir_paths is set of all directory paths.
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:raise BadStoreConfiguration exception if same directory path is
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already present in directory_paths.
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"""
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if datadir_path in directory_paths:
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msg = (_("Directory %(datadir_path)s specified "
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"multiple times in filesystem_store_datadirs "
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"option of filesystem configuration") %
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{'datadir_path': datadir_path})
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# If present with different priority it's a bad configuration
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if datadir_path not in priority_paths:
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LOG.exception(msg)
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raise exceptions.BadStoreConfiguration(
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store_name="filesystem", reason=msg)
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# Present with same prio (exact duplicate) only deserves a warning
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LOG.warning(msg)
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def _get_datadir_path_and_priority(self, datadir):
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"""
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Gets directory paths and its priority from
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filesystem_store_datadirs option in glance-api.conf.
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:datadir is directory path with its priority.
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:returns datadir_path as directory path
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priority as priority associated with datadir_path
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:raise BadStoreConfiguration exception if priority is invalid or
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empty directory path is specified.
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"""
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priority = 0
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parts = [part.strip() for part in datadir.rsplit(":", 1)]
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datadir_path = parts[0]
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if len(parts) == 2 and parts[1]:
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priority = parts[1]
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if not priority.isdigit():
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msg = (_("Invalid priority value %(priority)s in "
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"filesystem configuration") % {'priority': priority})
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LOG.exception(msg)
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raise exceptions.BadStoreConfiguration(
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store_name="filesystem", reason=msg)
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if not datadir_path:
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msg = _("Invalid directory specified in filesystem configuration")
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LOG.exception(msg)
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raise exceptions.BadStoreConfiguration(
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store_name="filesystem", reason=msg)
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return datadir_path, priority
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@staticmethod
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def _resolve_location(location):
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filepath = location.store_location.path
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if not os.path.exists(filepath):
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raise exceptions.NotFound(image=filepath)
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filesize = os.path.getsize(filepath)
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return filepath, filesize
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def _get_metadata(self, filepath):
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"""Return metadata dictionary.
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If metadata is provided as list of dictionaries then return
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metadata as dictionary containing 'id' and 'mountpoint'.
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If there are multiple nfs directories (mountpoints) configured
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for glance, then we need to create metadata JSON file as list
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of dictionaries containing all mountpoints with unique id.
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But Nova will not be able to find in which directory (mountpoint)
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image is present if we store list of dictionary(containing mountpoints)
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in glance image metadata. So if there are multiple mountpoints then
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we will return dict containing exact mountpoint where image is stored.
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If image path does not start with any of the 'mountpoint' provided
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in metadata JSON file then error is logged and empty
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dictionary is returned.
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:param filepath: Path of image on store
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:returns: metadata dictionary
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"""
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if self.FILESYSTEM_STORE_METADATA:
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for image_meta in self.FILESYSTEM_STORE_METADATA:
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if filepath.startswith(image_meta['mountpoint']):
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return image_meta
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reason = (_LE("The image path %(path)s does not match with "
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"any of the mountpoint defined in "
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"metadata: %(metadata)s. An empty dictionary "
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"will be returned to the client.")
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% dict(path=filepath,
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metadata=self.FILESYSTEM_STORE_METADATA))
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LOG.error(reason)
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return {}
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@capabilities.check
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def get(self, location, offset=0, chunk_size=None, context=None):
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"""
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Takes a `glance_store.location.Location` object that indicates
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where to find the image file, and returns a tuple of generator
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(for reading the image file) and image_size
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:param location `glance_store.location.Location` object, supplied
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from glance_store.location.get_location_from_uri()
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:raises `glance_store.exceptions.NotFound` if image does not exist
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"""
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filepath, filesize = self._resolve_location(location)
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msg = _("Found image at %s. Returning in ChunkedFile.") % filepath
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LOG.debug(msg)
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return (ChunkedFile(filepath,
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offset=offset,
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chunk_size=self.READ_CHUNKSIZE,
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partial_length=chunk_size),
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chunk_size or filesize)
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def get_size(self, location, context=None):
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"""
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Takes a `glance_store.location.Location` object that indicates
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where to find the image file and returns the image size
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:param location `glance_store.location.Location` object, supplied
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from glance_store.location.get_location_from_uri()
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:raises `glance_store.exceptions.NotFound` if image does not exist
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:rtype int
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"""
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filepath, filesize = self._resolve_location(location)
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msg = _("Found image at %s.") % filepath
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LOG.debug(msg)
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return filesize
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@capabilities.check
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def delete(self, location, context=None):
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"""
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Takes a `glance_store.location.Location` object that indicates
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where to find the image file to delete
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:location `glance_store.location.Location` object, supplied
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from glance_store.location.get_location_from_uri()
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:raises NotFound if image does not exist
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:raises Forbidden if cannot delete because of permissions
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"""
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loc = location.store_location
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fn = loc.path
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if os.path.exists(fn):
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try:
|
|
LOG.debug(_("Deleting image at %(fn)s"), {'fn': fn})
|
|
os.unlink(fn)
|
|
except OSError:
|
|
raise exceptions.Forbidden(
|
|
message=(_("You cannot delete file %s") % fn))
|
|
else:
|
|
raise exceptions.NotFound(image=fn)
|
|
|
|
def _get_capacity_info(self, mount_point):
|
|
"""Calculates total available space for given mount point.
|
|
|
|
:mount_point is path of glance data directory
|
|
"""
|
|
|
|
# Calculate total available space
|
|
stvfs_result = os.statvfs(mount_point)
|
|
total_available_space = stvfs_result.f_bavail * stvfs_result.f_bsize
|
|
return max(0, total_available_space)
|
|
|
|
def _find_best_datadir(self, image_size):
|
|
"""Finds the best datadir by priority and free space.
|
|
|
|
Traverse directories returning the first one that has sufficient
|
|
free space, in priority order. If two suitable directories have
|
|
the same priority, choose the one with the most free space
|
|
available.
|
|
:image_size size of image being uploaded.
|
|
:returns best_datadir as directory path of the best priority datadir.
|
|
:raises exceptions.StorageFull if there is no datadir in
|
|
self.priority_data_map that can accommodate the image.
|
|
"""
|
|
if not self.multiple_datadirs:
|
|
return self.datadir
|
|
|
|
best_datadir = None
|
|
max_free_space = 0
|
|
for priority in self.priority_list:
|
|
for datadir in self.priority_data_map.get(priority):
|
|
free_space = self._get_capacity_info(datadir)
|
|
if free_space >= image_size and free_space > max_free_space:
|
|
max_free_space = free_space
|
|
best_datadir = datadir
|
|
|
|
# If datadir is found which can accommodate image and has maximum
|
|
# free space for the given priority then break the loop,
|
|
# else continue to lookup further.
|
|
if best_datadir:
|
|
break
|
|
else:
|
|
msg = (_("There is no enough disk space left on the image "
|
|
"storage media. requested=%s") % image_size)
|
|
LOG.exception(msg)
|
|
raise exceptions.StorageFull(message=msg)
|
|
|
|
return best_datadir
|
|
|
|
@capabilities.check
|
|
def add(self, image_id, image_file, image_size, context=None,
|
|
verifier=None):
|
|
"""
|
|
Stores an image file with supplied identifier to the backend
|
|
storage system and returns a tuple containing information
|
|
about the stored image.
|
|
|
|
:param image_id: The opaque image identifier
|
|
:param image_file: The image data to write, as a file-like object
|
|
:param image_size: The size of the image data to write, in bytes
|
|
:param verifier: An object used to verify signatures for images
|
|
|
|
:retval tuple of URL in backing store, bytes written, checksum
|
|
and a dictionary with storage system specific information
|
|
:raises `glance_store.exceptions.Duplicate` if the image already
|
|
existed
|
|
|
|
:note By default, the backend writes the image data to a file
|
|
`/<DATADIR>/<ID>`, where <DATADIR> is the value of
|
|
the filesystem_store_datadir configuration option and <ID>
|
|
is the supplied image ID.
|
|
"""
|
|
|
|
datadir = self._find_best_datadir(image_size)
|
|
filepath = os.path.join(datadir, str(image_id))
|
|
|
|
if os.path.exists(filepath):
|
|
raise exceptions.Duplicate(image=filepath)
|
|
|
|
checksum = hashlib.md5()
|
|
bytes_written = 0
|
|
try:
|
|
with open(filepath, 'wb') as f:
|
|
for buf in utils.chunkreadable(image_file,
|
|
self.WRITE_CHUNKSIZE):
|
|
bytes_written += len(buf)
|
|
checksum.update(buf)
|
|
if verifier:
|
|
verifier.update(buf)
|
|
f.write(buf)
|
|
except IOError as e:
|
|
if e.errno != errno.EACCES:
|
|
self._delete_partial(filepath, image_id)
|
|
errors = {errno.EFBIG: exceptions.StorageFull(),
|
|
errno.ENOSPC: exceptions.StorageFull(),
|
|
errno.EACCES: exceptions.StorageWriteDenied()}
|
|
raise errors.get(e.errno, e)
|
|
except Exception:
|
|
with excutils.save_and_reraise_exception():
|
|
self._delete_partial(filepath, image_id)
|
|
|
|
checksum_hex = checksum.hexdigest()
|
|
metadata = self._get_metadata(filepath)
|
|
|
|
LOG.debug(_("Wrote %(bytes_written)d bytes to %(filepath)s with "
|
|
"checksum %(checksum_hex)s"),
|
|
{'bytes_written': bytes_written,
|
|
'filepath': filepath,
|
|
'checksum_hex': checksum_hex})
|
|
|
|
if self.conf.glance_store.filesystem_store_file_perm > 0:
|
|
perm = int(str(self.conf.glance_store.filesystem_store_file_perm),
|
|
8)
|
|
try:
|
|
os.chmod(filepath, perm)
|
|
except (IOError, OSError):
|
|
LOG.warning(_LW("Unable to set permission to image: %s") %
|
|
filepath)
|
|
|
|
return ('file://%s' % filepath, bytes_written, checksum_hex, metadata)
|
|
|
|
@staticmethod
|
|
def _delete_partial(filepath, iid):
|
|
try:
|
|
os.unlink(filepath)
|
|
except Exception as e:
|
|
msg = _('Unable to remove partial image '
|
|
'data for image %(iid)s: %(e)s')
|
|
LOG.error(msg % dict(iid=iid,
|
|
e=encodeutils.exception_to_unicode(e)))
|