403 lines
14 KiB
Python
403 lines
14 KiB
Python
# Copyright 2010-2011 OpenStack Foundation
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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 logging
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import sys
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from oslo.config import cfg
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from stevedore import driver
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from stevedore import extension
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from glance_store.common import utils
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from glance_store import exceptions
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from glance_store import i18n
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from glance_store import location
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LOG = logging.getLogger(__name__)
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_ = i18n._
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_DEPRECATED_STORE_OPTS = [
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cfg.DeprecatedOpt('known_stores', group='DEFAULT'),
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cfg.DeprecatedOpt('default_store', group='DEFAULT')
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]
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_STORE_OPTS = [
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cfg.ListOpt('stores', default=['file', 'http'],
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help=_('List of stores enabled'),
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deprecated_opts=[_DEPRECATED_STORE_OPTS[0]]),
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cfg.StrOpt('default_store', default='file',
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help=_("Default scheme to use to store image data. The "
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"scheme must be registered by one of the stores "
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"defined by the 'stores' config option."),
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deprecated_opts=[_DEPRECATED_STORE_OPTS[1]])
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]
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CONF = cfg.CONF
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_STORE_CFG_GROUP = 'glance_store'
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def _list_opts():
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driver_opts = []
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mgr = extension.ExtensionManager('glance_store.drivers')
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# NOTE(zhiyan): Handle available drivers entry_points provided
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drivers = [ext.name for ext in mgr]
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handled_drivers = [] # Used to handle backwards-compatible entries
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for store_entry in drivers:
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driver_cls = _load_store(None, store_entry, False)
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if driver_cls and driver_cls not in handled_drivers:
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if getattr(driver_cls, 'OPTIONS', None) is not None:
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# NOTE(flaper87): To be removed in k-2. This should
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# give deployers enough time to migrate their systems
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# and move configs under the new section.
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for opt in driver_cls.OPTIONS:
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opt.deprecated_opts = [cfg.DeprecatedOpt(opt.name,
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group='DEFAULT')]
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driver_opts.append(opt)
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handled_drivers.append(driver_cls)
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# NOTE(zhiyan): This separated approach could list
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# store options before all driver ones, which easier
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# to read and configure by operator.
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return ([(_STORE_CFG_GROUP, _STORE_OPTS)] +
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[(_STORE_CFG_GROUP, driver_opts)])
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def register_opts(conf):
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opts = _list_opts()
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for group, opt_list in opts:
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LOG.debug("Registering options for group %s" % group)
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for opt in opt_list:
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conf.register_opt(opt, group=group)
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class Indexable(object):
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"""Indexable for file-like objs iterators
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Wrapper that allows an iterator or filelike be treated as an indexable
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data structure. This is required in the case where the return value from
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Store.get() is passed to Store.add() when adding a Copy-From image to a
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Store where the client library relies on eventlet GreenSockets, in which
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case the data to be written is indexed over.
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"""
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def __init__(self, wrapped, size):
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"""
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Initialize the object
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:param wrappped: the wrapped iterator or filelike.
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:param size: the size of data available
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"""
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self.wrapped = wrapped
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self.size = int(size) if size else (wrapped.len
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if hasattr(wrapped, 'len') else 0)
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self.cursor = 0
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self.chunk = None
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def __iter__(self):
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"""
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Delegate iteration to the wrapped instance.
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"""
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for self.chunk in self.wrapped:
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yield self.chunk
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def __getitem__(self, i):
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"""
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Index into the next chunk (or previous chunk in the case where
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the last data returned was not fully consumed).
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:param i: a slice-to-the-end
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"""
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start = i.start if isinstance(i, slice) else i
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if start < self.cursor:
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return self.chunk[(start - self.cursor):]
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self.chunk = self.another()
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if self.chunk:
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self.cursor += len(self.chunk)
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return self.chunk
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def another(self):
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"""Implemented by subclasses to return the next element."""
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raise NotImplementedError
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def getvalue(self):
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"""
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Return entire string value... used in testing
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"""
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return self.wrapped.getvalue()
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def __len__(self):
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"""
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Length accessor.
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"""
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return self.size
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def _load_store(conf, store_entry, invoke_load=True):
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try:
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LOG.debug("Attempting to import store %s", store_entry)
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mgr = driver.DriverManager('glance_store.drivers',
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store_entry,
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invoke_args=[conf],
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invoke_on_load=invoke_load)
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return mgr.driver
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except RuntimeError:
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LOG.warn("Failed to load driver %(driver)s."
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"The driver will be disabled" % dict(driver=driver))
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def _load_stores(conf):
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for store_entry in set(conf.glance_store.stores):
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try:
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# FIXME(flaper87): Don't hide BadStoreConfiguration
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# exceptions. These exceptions should be propagated
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# to the user of the library.
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store_instance = _load_store(conf, store_entry)
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if not store_instance:
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continue
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yield (store_entry, store_instance)
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except exceptions.BadStoreConfiguration:
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continue
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def create_stores(conf=CONF):
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"""
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Registers all store modules and all schemes
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from the given config. Duplicates are not re-registered.
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"""
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store_count = 0
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for (store_entry, store_instance) in _load_stores(conf):
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try:
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schemes = store_instance.get_schemes()
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store_instance.configure()
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except NotImplementedError:
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continue
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if not schemes:
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raise exceptions.BackendException('Unable to register store %s. '
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'No schemes associated with it.'
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% store_entry)
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else:
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LOG.debug("Registering store %s with schemes %s",
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store_entry, schemes)
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scheme_map = {}
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for scheme in schemes:
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loc_cls = store_instance.get_store_location_class()
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scheme_map[scheme] = {
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'store': store_instance,
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'location_class': loc_cls,
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}
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location.register_scheme_map(scheme_map)
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store_count += 1
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return store_count
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def verify_default_store():
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scheme = cfg.CONF.glance_store.default_store
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try:
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get_store_from_scheme(scheme)
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except exceptions.UnknownScheme:
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msg = _("Store for scheme %s not found") % scheme
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raise RuntimeError(msg)
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def get_known_schemes():
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"""Returns list of known schemes."""
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return location.SCHEME_TO_CLS_MAP.keys()
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def get_store_from_scheme(scheme):
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"""
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Given a scheme, return the appropriate store object
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for handling that scheme.
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"""
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if scheme not in location.SCHEME_TO_CLS_MAP:
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raise exceptions.UnknownScheme(scheme=scheme)
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scheme_info = location.SCHEME_TO_CLS_MAP[scheme]
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return scheme_info['store']
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def get_store_from_uri(uri):
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"""
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Given a URI, return the store object that would handle
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operations on the URI.
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:param uri: URI to analyze
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"""
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scheme = uri[0:uri.find('/') - 1]
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return get_store_from_scheme(scheme)
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def get_from_backend(uri, offset=0, chunk_size=None, context=None):
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"""Yields chunks of data from backend specified by uri."""
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loc = location.get_location_from_uri(uri)
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store = get_store_from_uri(uri)
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try:
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return store.get(loc, offset=offset,
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chunk_size=chunk_size,
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context=context)
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except NotImplementedError:
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raise exceptions.StoreGetNotSupported
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def get_size_from_backend(uri, context=None):
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"""Retrieves image size from backend specified by uri."""
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loc = location.get_location_from_uri(uri)
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store = get_store_from_uri(uri)
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return store.get_size(loc, context=context)
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def delete_from_backend(uri, context=None):
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"""Removes chunks of data from backend specified by uri."""
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loc = location.get_location_from_uri(uri)
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store = get_store_from_uri(uri)
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try:
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return store.delete(loc, context=context)
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except NotImplementedError:
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raise exceptions.StoreDeleteNotSupported
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def get_store_from_location(uri):
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"""
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Given a location (assumed to be a URL), attempt to determine
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the store from the location. We use here a simple guess that
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the scheme of the parsed URL is the store...
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:param uri: Location to check for the store
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"""
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loc = location.get_location_from_uri(uri)
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return loc.store_name
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def safe_delete_from_backend(uri, image_id, context=None):
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"""Given a uri, delete an image from the store."""
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try:
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return delete_from_backend(uri, context=context)
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except exceptions.NotFound:
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msg = _('Failed to delete image %s in store from URI')
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LOG.warn(msg % image_id)
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except exceptions.StoreDeleteNotSupported as e:
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LOG.warn(utils.exception_to_str(e))
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except exceptions.UnsupportedBackend:
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exc_type = sys.exc_info()[0].__name__
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msg = (_('Failed to delete image %(image_id)s '
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'from store (%(exc_type)s)') %
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dict(image_id=image_id, exc_type=exc_type))
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LOG.error(msg)
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def _delete_image_from_backend(context, store_api, image_id, uri):
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if CONF.delayed_delete:
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store_api.schedule_delayed_delete_from_backend(context, uri, image_id)
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else:
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store_api.safe_delete_from_backend(context, uri, image_id)
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def check_location_metadata(val, key=''):
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if isinstance(val, dict):
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for key in val:
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check_location_metadata(val[key], key=key)
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elif isinstance(val, list):
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ndx = 0
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for v in val:
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check_location_metadata(v, key='%s[%d]' % (key, ndx))
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ndx = ndx + 1
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elif not isinstance(val, unicode):
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raise exceptions.BackendException(_("The image metadata key %(key)s "
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"has an invalid type of %(type)s. "
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"Only dict, list, and unicode are "
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"supported.")
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% dict(key=key, type=type(val)))
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def store_add_to_backend(image_id, data, size, store, context=None):
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"""
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A wrapper around a call to each stores add() method. This gives glance
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a common place to check the output
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:param image_id: The image add to which data is added
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:param data: The data to be stored
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:param size: The length of the data in bytes
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:param store: The store to which the data is being added
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:return: The url location of the file,
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the size amount of data,
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the checksum of the data
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the storage systems metadata dictionary for the location
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"""
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(location, size, checksum, metadata) = store.add(image_id, data, size)
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if metadata is not None:
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if not isinstance(metadata, dict):
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msg = (_("The storage driver %(driver)s returned invalid "
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" metadata %(metadata)s. This must be a dictionary type")
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% dict(driver=str(store), metadata=str(metadata)))
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LOG.error(msg)
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raise exceptions.BackendException(msg)
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try:
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check_location_metadata(metadata)
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except exceptions.BackendException as e:
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e_msg = (_("A bad metadata structure was returned from the "
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"%(driver)s storage driver: %(metadata)s. %(e)s.") %
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dict(driver=utils.exception_to_str(store),
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metadata=utils.exception_to_str(metadata),
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e=utils.exception_to_str(e)))
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LOG.error(e_msg)
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raise exceptions.BackendException(e_msg)
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return (location, size, checksum, metadata)
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def add_to_backend(conf, image_id, data, size, scheme=None, context=None):
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if scheme is None:
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scheme = conf['glance_store']['default_store']
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store = get_store_from_scheme(scheme)
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try:
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return store_add_to_backend(image_id, data, size, store, context)
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except NotImplementedError:
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raise exceptions.StoreAddNotSupported
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def set_acls(location_uri, public=False, read_tenants=[],
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write_tenants=None, context=None):
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if write_tenants is None:
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write_tenants = []
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loc = location.get_location_from_uri(location_uri)
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scheme = get_store_from_location(location_uri)
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store = get_store_from_scheme(scheme)
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try:
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store.set_acls(loc, public=public,
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read_tenants=read_tenants,
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write_tenants=write_tenants)
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except NotImplementedError:
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LOG.debug(_("Skipping store.set_acls... not implemented."))
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def validate_location(uri, context=None):
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store = get_store_from_uri(uri)
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store.validate_location(uri)
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