def get_location_from_uri_and_backend(uri, backend, conf=CONF):
"""Extract backend location from a URI.
Given a URI, return a Location object that has had an appropriate
store parse the URI.
:param uri: A URI that could come from the end-user in the Location
attribute/header.
:param backend: A backend name for the store.
:param conf: The global configuration.
Example URIs:
https://user:[email protected]:80/images/some-id
http://example.com/123456
swift://example.com/container/obj-id
swift://user:account:[email protected]/container/obj-id
swift+http://user:account:[email protected]/container/obj-id
file:///var/lib/glance/images/1
cinder://volume-id
"""
pieces = urllib.parse.urlparse(uri)
if pieces.scheme not in SCHEME_TO_CLS_BACKEND_MAP.keys():
raise exceptions.UnknownScheme(scheme=pieces.scheme)
try:
scheme_info = SCHEME_TO_CLS_BACKEND_MAP[pieces.scheme][backend]
except KeyError:
raise exceptions.UnknownScheme(scheme=backend)
return Location(pieces.scheme,
scheme_info['location_class'],
conf,
uri=uri,
backend=backend)
def get_store_from_scheme(scheme):
"""
Given a scheme, return the appropriate store object
for handling that scheme.
"""
if scheme not in location.SCHEME_TO_CLS_MAP:
raise exceptions.UnknownScheme(scheme=scheme)
scheme_info = location.SCHEME_TO_CLS_MAP[scheme]
store = scheme_info['store']
if not store.is_capable(capabilities.BitMasks.DRIVER_REUSABLE):
# Driver instance isn't stateless so it can't
# be reused safely and need recreation.
store_entry = scheme_info['store_entry']
store = _load_store(store.conf, store_entry, invoke_load=True)
store.configure()
try:
scheme_map = {}
loc_cls = store.get_store_location_class()
for scheme in store.get_schemes():
scheme_map[scheme] = {
'store': store,
'location_class': loc_cls,
'store_entry': store_entry
}
location.register_scheme_map(scheme_map)
except NotImplementedError:
scheme_info['store'] = store
return store
def get_location_from_uri(uri):
"""
Given a URI, return a Location object that has had an appropriate
store parse the URI.
:param uri: A URI that could come from the end-user in the Location
attribute/header
Example URIs:
https://user:[email protected]:80/images/some-id
http://images.oracle.com/123456
swift://example.com/container/obj-id
swift://user:account:[email protected]/container/obj-id
swift+http://user:account:[email protected]/container/obj-id
s3://accesskey:[email protected]/bucket/key-id
s3+https://accesskey:[email protected]/bucket/key-id
file:///var/lib/glance/images/1
cinder://volume-id
"""
pieces = urlparse.urlparse(uri)
if pieces.scheme not in SCHEME_TO_CLS_MAP.keys():
raise exceptions.UnknownScheme(scheme=pieces.scheme)
scheme_info = SCHEME_TO_CLS_MAP[pieces.scheme]
return Location(pieces.scheme,
uri=uri,
store_location_class=scheme_info['location_class'])
def get_location_from_uri(uri, conf=CONF):
"""
Given a URI, return a Location object that has had an appropriate
store parse the URI.
:param uri: A URI that could come from the end-user in the Location
attribute/header.
:param conf: The global configuration.
Example URIs:
https://user:[email protected]:80/images/some-id
http://images.oracle.com/123456
swift://example.com/container/obj-id
swift://user:account:[email protected]/container/obj-id
swift+http://user:account:[email protected]/container/obj-id
file:///var/lib/glance/images/1
cinder://volume-id
"""
pieces = urllib.parse.urlparse(uri)
#先自url中取出scheme,检查scheme是否在keys中，如果不在，直接报错
if pieces.scheme not in SCHEME_TO_CLS_MAP.keys():
raise exceptions.UnknownScheme(scheme=pieces.scheme)
scheme_info = SCHEME_TO_CLS_MAP[pieces.scheme]
return Location(pieces.scheme, scheme_info['location_class'],
conf, uri=uri)
def get_store_from_store_identifier(store_identifier):
"""Determine backing store from identifier.
Given a store identifier, return the appropriate store object
for handling that scheme.
"""
scheme_map = {}
enabled_backends = CONF.enabled_backends
try:
scheme = enabled_backends[store_identifier]
except KeyError:
msg = _("Store for identifier %s not found") % store_identifier
raise exceptions.UnknownScheme(msg)
if scheme not in location.SCHEME_TO_CLS_BACKEND_MAP:
raise exceptions.UnknownScheme(scheme=scheme)
scheme_info = location.SCHEME_TO_CLS_BACKEND_MAP[scheme][store_identifier]
store = scheme_info['store']
if not store.is_capable(capabilities.BitMasks.DRIVER_REUSABLE):
# Driver instance isn't stateless so it can't
# be reused safely and need recreation.
store_entry = scheme_info['store_entry']
store = _load_multi_store(store.conf,
store_entry,
invoke_load=True,
backend=store_identifier)
store.configure()
try:
loc_cls = store.get_store_location_class()
for new_scheme in store.get_schemes():
if new_scheme not in scheme_map:
scheme_map[new_scheme] = {}
scheme_map[new_scheme][store_identifier] = {
'store': store,
'location_class': loc_cls,
'store_entry': store_entry
}
location.register_scheme_backend_map(scheme_map)
except NotImplementedError:
scheme_info['store'] = store
return store
def get_store_from_scheme(scheme):
"""
Given a scheme, return the appropriate store object
for handling that scheme.
"""
if scheme not in location.SCHEME_TO_CLS_MAP:
raise exceptions.UnknownScheme(scheme=scheme)
scheme_info = location.SCHEME_TO_CLS_MAP[scheme]
return scheme_info['store']
