def check_volume_for_service_type(volume_path, required_type):
"""
Check if `volume_path` points to a directory for the specified service
type.
:returns: the namespace name and the service ID
:raises oio.common.exceptions.OioException: when the specified path
does not belong to a service from the specified type or is missing
some attributes.
"""
msg_pfx = 'Invalid volume path [%s]: ' % volume_path
meta = read_user_xattr(volume_path)
server_type = meta.get(volume_xattr_keys['type'])
if server_type is None:
raise exc.OioException(msg_pfx + 'missing %s xattr' %
volume_xattr_keys['type'])
if server_type != required_type:
raise exc.OioException(
msg_pfx + 'service is a {0}, not a {1}'.format(server_type,
required_type))
namespace = meta.get(volume_xattr_keys['namespace'])
server_id = meta.get(volume_xattr_keys['id'])
if server_id is None:
raise exc.OioException(msg_pfx + 'missing %s xattr' %
volume_xattr_keys['id'])
elif namespace is None:
raise exc.OioException(msg_pfx + 'missing %s xattr' %
volume_xattr_keys['namespace'])
return namespace, server_id
def read_chunk_metadata(fd, chunk_id, check_chunk_id=True):
chunk_id = chunk_id.upper()
raw_meta = read_user_xattr(fd)
raw_meta_copy = None
meta = {}
meta['links'] = dict()
raw_chunk_id = container_id = path = version = content_id = None
for k, v in raw_meta.iteritems():
# New chunk
if k.startswith(CHUNK_XATTR_CONTENT_FULLPATH_PREFIX):
chunkid = k[len(CHUNK_XATTR_CONTENT_FULLPATH_PREFIX):]
if chunkid == chunk_id:
raw_chunk_id = chunkid
meta['full_path'] = v
account, container, path, version, content_id = \
decode_fullpath(v)
container_id = cid_from_name(account, container)
else:
meta['links'][chunkid] = v
if raw_chunk_id:
raw_meta_copy = raw_meta.copy()
raw_meta[chunk_xattr_keys['chunk_id']] = raw_chunk_id
raw_meta[chunk_xattr_keys['container_id']] = container_id
raw_meta[chunk_xattr_keys['content_path']] = path
raw_meta[chunk_xattr_keys['content_version']] = version
raw_meta[chunk_xattr_keys['content_id']] = content_id
for k, v in chunk_xattr_keys.iteritems():
if v not in raw_meta:
if k not in chunk_xattr_keys_optional:
raise exc.MissingAttribute(v)
else:
meta[k] = raw_meta[v]
if check_chunk_id and meta['chunk_id'] != chunk_id:
raise exc.MissingAttribute(chunk_xattr_keys['chunk_id'])
return meta, raw_meta_copy if raw_meta_copy else raw_meta
def read_chunk_metadata(fd):
raw_meta = read_user_xattr(fd)
meta = {}
for k, v in chunk_xattr_keys.iteritems():
if v not in raw_meta:
if k not in chunk_xattr_keys_optional:
raise exc.MissingAttribute(v)
else:
meta[k] = raw_meta[v]
return meta
def check_volume(volume_path):
meta = read_user_xattr(volume_path)
server_type = meta.get(volume_xattr_keys['type'])
if server_type != 'rawx':
raise exc.OioException('Invalid volume path')
namespace = meta.get(volume_xattr_keys['namespace'])
server_id = meta.get(volume_xattr_keys['id'])
if namespace is None or server_id is None:
raise exc.OioException('Invalid rawx volume path')
return namespace, server_id
def read_chunk_metadata(fd, chunk_id, check_chunk_id=True):
chunk_id = chunk_id.upper()
raw_meta = read_user_xattr(fd)
raw_meta_copy = None
meta = {}
meta['links'] = dict()
attr_vers = 0.0
raw_chunk_id = container_id = path = version = content_id = None
missing = list()
for k, v in raw_meta.iteritems():
# New chunks have a version
if k == chunk_xattr_keys['oio_version']:
attr_vers = float(v)
# Chunks with version >= 4.2 have a "full_path"
elif k.startswith(CHUNK_XATTR_CONTENT_FULLPATH_PREFIX):
parsed_chunk_id = k[len(CHUNK_XATTR_CONTENT_FULLPATH_PREFIX):]
if parsed_chunk_id == chunk_id:
raw_chunk_id = parsed_chunk_id
meta['full_path'] = v
account, container, path, version, content_id = \
decode_fullpath(v)
container_id = cid_from_name(account, container)
else:
meta['links'][parsed_chunk_id] = v
if raw_chunk_id:
raw_meta_copy = raw_meta.copy()
raw_meta[chunk_xattr_keys['chunk_id']] = raw_chunk_id
raw_meta[chunk_xattr_keys['container_id']] = container_id
raw_meta[chunk_xattr_keys['content_path']] = path
raw_meta[chunk_xattr_keys['content_version']] = version
raw_meta[chunk_xattr_keys['content_id']] = content_id
if attr_vers >= 4.2 and 'full_path' not in meta:
# TODO(FVE): in that case, do not warn about other attributes
# that could be deduced from this one.
missing.append(
exc.MissingAttribute(CHUNK_XATTR_CONTENT_FULLPATH_PREFIX +
chunk_id))
for k, v in chunk_xattr_keys.iteritems():
if v not in raw_meta:
if k not in chunk_xattr_keys_optional:
missing.append(exc.MissingAttribute(v))
else:
meta[k] = raw_meta[v]
if missing:
raise exc.FaultyChunk(*missing)
if check_chunk_id and meta['chunk_id'] != chunk_id:
raise exc.MissingAttribute(chunk_xattr_keys['chunk_id'])
return meta, raw_meta_copy if raw_meta_copy else raw_meta
