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|
# Copyright (c) 2012-2013 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
import errno
from gluster.swift.common.fs_utils import dir_empty, mkdirs, do_chown, \
do_exists, do_touch
from gluster.swift.common.utils import validate_account, validate_container, \
get_container_details, get_account_details, create_container_metadata, \
create_account_metadata, DEFAULT_GID, get_container_metadata, \
get_account_metadata, DEFAULT_UID, validate_object, \
create_object_metadata, read_metadata, write_metadata, X_CONTENT_TYPE, \
X_CONTENT_LENGTH, X_TIMESTAMP, X_PUT_TIMESTAMP, X_ETAG, X_OBJECTS_COUNT, \
X_BYTES_USED, X_CONTAINER_COUNT, DIR_TYPE, rmobjdir, dir_is_object
from gluster.swift.common import Glusterfs
from gluster.swift.common.exceptions import FileOrDirNotFoundError, \
GlusterFileSystemIOError
from swift.common.constraints import MAX_META_COUNT, MAX_META_OVERALL_SIZE
from swift.common.swob import HTTPBadRequest
DATADIR = 'containers'
# Create a dummy db_file in Glusterfs.RUN_DIR
_db_file = ""
def _read_metadata(dd):
""" Filter read metadata so that it always returns a tuple that includes
some kind of timestamp. With 1.4.8 of the Swift integration the
timestamps were not stored. Here we fabricate timestamps for volumes
where the existing data has no timestamp (that is, stored data is not
a tuple), allowing us a measure of backward compatibility.
FIXME: At this time it does not appear that the timestamps on each
metadata are used for much, so this should not hurt anything.
"""
metadata_i = read_metadata(dd)
metadata = {}
timestamp = 0
for key, value in metadata_i.iteritems():
if not isinstance(value, tuple):
value = (value, timestamp)
metadata[key] = value
return metadata
def filter_prefix(objects, prefix):
"""
Accept a sorted list of strings, returning all strings starting with the
given prefix.
"""
found = False
for object_name in objects:
if object_name.startswith(prefix):
yield object_name
found = True
else:
# Since the list is assumed to be sorted, once we find an object
# name that does not start with the prefix we know we won't find
# any others, so we exit early.
if found:
break
def filter_delimiter(objects, delimiter, prefix, marker, path=None):
"""
Accept a sorted list of strings, returning strings that:
1. begin with "prefix" (empty string matches all)
2. does not match the "path" argument
3. does not contain the delimiter in the given prefix length
"""
assert delimiter
assert prefix is not None
skip_name = None
for object_name in objects:
if prefix and not object_name.startswith(prefix):
break
if path is not None:
if object_name == path:
continue
if skip_name:
if object_name < skip_name:
continue
else:
skip_name = None
end = object_name.find(delimiter, len(prefix))
if end >= 0 and (len(object_name) > (end + 1)):
skip_name = object_name[:end] + chr(ord(delimiter) + 1)
continue
else:
if skip_name:
if object_name < skip_name:
continue
else:
skip_name = None
end = object_name.find(delimiter, len(prefix))
if end > 0:
dir_name = object_name[:end + 1]
if dir_name != marker:
yield dir_name
skip_name = object_name[:end] + chr(ord(delimiter) + 1)
continue
yield object_name
def filter_marker(objects, marker):
"""
Accept sorted list of strings, return all strings whose value is strictly
greater than the given marker value.
"""
for object_name in objects:
if object_name > marker:
yield object_name
def filter_prefix_as_marker(objects, prefix):
"""
Accept sorted list of strings, return all strings whose value is greater
than or equal to the given prefix value.
"""
for object_name in objects:
if object_name >= prefix:
yield object_name
def filter_end_marker(objects, end_marker):
"""
Accept a list of strings, sorted, and return all the strings that are
strictly less than the given end_marker string. We perform this as a
generator to avoid creating potentially large intermediate object lists.
"""
for object_name in objects:
if object_name < end_marker:
yield object_name
else:
break
class DiskCommon(object):
"""
Common fields and methods shared between DiskDir and DiskAccount classes.
"""
def __init__(self, root, drive, account, logger, pending_timeout=None,
stale_reads_ok=False):
# WARNING: The following four fields are referenced as fields by our
# callers outside of this module, do not remove.
# Create a dummy db_file in Glusterfs.RUN_DIR
global _db_file
if not _db_file:
_db_file = os.path.join(Glusterfs.RUN_DIR, 'db_file.db')
if not do_exists(_db_file):
do_touch(_db_file)
self.db_file = _db_file
self.metadata = {}
self.pending_timeout = pending_timeout or 10
self.stale_reads_ok = stale_reads_ok
# The following fields are common
self.root = root
assert logger is not None
self.logger = logger
self.account = account
self.datadir = os.path.join(root, drive)
self._dir_exists = None
def _dir_exists_read_metadata(self):
self._dir_exists = do_exists(self.datadir)
if self._dir_exists:
try:
self.metadata = _read_metadata(self.datadir)
except GlusterFileSystemIOError as err:
if err.errno in (errno.ENOENT, errno.ESTALE):
return False
raise
return self._dir_exists
def is_deleted(self):
# The intention of this method is to check the file system to see if
# the directory actually exists.
return not do_exists(self.datadir)
def empty(self):
# If it does not exist, then it is empty. A value of True is
# what is expected by OpenStack Swift when the directory does
# not exist. Check swift/common/db.py:ContainerBroker.empty()
# and swift/container/server.py:ContainerController.DELETE()
# for more information
try:
return dir_empty(self.datadir)
except FileOrDirNotFoundError:
return True
def validate_metadata(self, metadata):
"""
Validates that metadata falls within acceptable limits.
:param metadata: to be validated
:raises: HTTPBadRequest if MAX_META_COUNT or MAX_META_OVERALL_SIZE
is exceeded
"""
meta_count = 0
meta_size = 0
for key, (value, timestamp) in metadata.iteritems():
key = key.lower()
if value != '' and (key.startswith('x-account-meta') or
key.startswith('x-container-meta')):
prefix = 'x-account-meta-'
if key.startswith('x-container-meta-'):
prefix = 'x-container-meta-'
key = key[len(prefix):]
meta_count = meta_count + 1
meta_size = meta_size + len(key) + len(value)
if meta_count > MAX_META_COUNT:
raise HTTPBadRequest('Too many metadata items; max %d'
% MAX_META_COUNT)
if meta_size > MAX_META_OVERALL_SIZE:
raise HTTPBadRequest('Total metadata too large; max %d'
% MAX_META_OVERALL_SIZE)
def update_metadata(self, metadata, validate_metadata=False):
assert self.metadata, "Valid container/account metadata should have " \
"been created by now"
if metadata:
new_metadata = self.metadata.copy()
new_metadata.update(metadata)
if validate_metadata:
self.validate_metadata(new_metadata)
if new_metadata != self.metadata:
write_metadata(self.datadir, new_metadata)
self.metadata = new_metadata
class DiskDir(DiskCommon):
"""
Manage object files on disk.
:param path: path to devices on the node
:param drive: gluster volume drive name
:param account: account name for the object
:param container: container name for the object
:param logger: account or container server logging object
:param uid: user ID container object should assume
:param gid: group ID container object should assume
Usage pattern from container/server.py (Kilo, 2.3.0):
DELETE:
if auto-create and obj and not .db_file:
# Creates container
.initialize()
if not .db_file:
# Container does not exist
return 404
if obj:
# Should be a NOOP
.delete_object()
else:
if not .empty()
# Gluster's definition of empty should mean only
# sub-directories exist in Object-Only mode
return conflict
.get_info()['put_timestamp'] and not .is_deleted()
# Deletes container
.delete_db()
if not .is_deleted():
return conflict
account_update():
.get_info()
PUT:
if obj:
if auto-create cont and not .db_file
# Creates container
.initialize()
if not .db_file
return 404
.put_object()
else:
_update_or_create():
if not .db_file:
# Creates container
.initialize()
recreated = .is_deleted():
if recreated:
.set_storage_policy_index()
.storage_policy_index
.update_put_timestamp()
if .is_deleted()
return conflict
if recreated:
.update_status_changed_at()
if 'X-Container-Sync-To' in metadata:
if .metadata
.set_x_container_sync_points()
.update_metadata()
account_update():
.get_info()
HEAD:
info, is_deleted = .get_info_is_deleted()
.get_info_is_deleted():
if not .db_file:
return {}, True
info = .get_info()
return info, ._is_deleted_info()
.metadata
GET:
info, is_deleted = .get_info_is_deleted()
.get_info_is_deleted():
if not .db_file:
return {}, True
info = .get_info()
return info, ._is_deleted_info()
.list_objects_iter()
.metadata
POST:
if .is_deleted():
return 404
.metadata
.set_x_container_sync_points()
.update_metadata()
"""
def __init__(self, path, drive, account, container, logger,
uid=DEFAULT_UID, gid=DEFAULT_GID, **kwargs):
super(DiskDir, self).__init__(path, drive, account, logger, **kwargs)
self.uid = int(uid)
self.gid = int(gid)
self.container = container
self.datadir = os.path.join(self.datadir, self.container)
if not self._dir_exists_read_metadata():
return
if not self.metadata:
create_container_metadata(self.datadir)
self.metadata = _read_metadata(self.datadir)
else:
if not validate_container(self.metadata):
create_container_metadata(self.datadir)
self.metadata = _read_metadata(self.datadir)
def update_status_changed_at(self, timestamp):
return
@property
def storage_policy_index(self):
if not hasattr(self, '_storage_policy_index'):
self._storage_policy_index = \
self.get_info()['storage_policy_index']
return self._storage_policy_index
def set_storage_policy_index(self, policy_index, timestamp=None):
self._storage_policy_index = policy_index
def list_objects_iter(self, limit, marker, end_marker,
prefix, delimiter, path=None,
storage_policy_index=0):
"""
Returns tuple of name, created_at, size, content_type, etag.
"""
assert limit >= 0
assert not delimiter or (len(delimiter) == 1 and ord(delimiter) <= 254)
if path is not None:
if path:
prefix = path = path.rstrip('/') + '/'
else:
prefix = path
delimiter = '/'
elif delimiter and not prefix:
prefix = ''
container_list = []
objects = self._update_object_count()
if objects:
objects.sort()
else:
return container_list
if end_marker:
objects = filter_end_marker(objects, end_marker)
if marker and marker >= prefix:
objects = filter_marker(objects, marker)
elif prefix:
objects = filter_prefix_as_marker(objects, prefix)
if prefix is None:
# No prefix, we don't need to apply the other arguments, we just
# return what we have.
pass
else:
# We have a non-None (for all intents and purposes it is a string)
# prefix.
if not delimiter:
if not prefix:
# We have nothing more to do
pass
else:
objects = filter_prefix(objects, prefix)
else:
objects = filter_delimiter(objects, delimiter, prefix, marker,
path)
count = 0
for obj in objects:
obj_path = os.path.join(self.datadir, obj)
try:
metadata = read_metadata(obj_path)
except GlusterFileSystemIOError as err:
if err.errno in (errno.ENOENT, errno.ESTALE):
# obj might have been deleted by another process
# since the objects list was originally built
continue
else:
raise err
if not metadata or not validate_object(metadata):
if delimiter == '/' and obj_path[-1] == delimiter:
clean_obj_path = obj_path[:-1]
else:
clean_obj_path = obj_path
try:
metadata = create_object_metadata(clean_obj_path)
except OSError as e:
# FIXME - total hack to get upstream swift ported unit
# test cases working for now.
if e.errno not in (errno.ENOENT, errno.ESTALE):
raise
if not Glusterfs._implicit_dir_objects and metadata \
and metadata[X_CONTENT_TYPE] == DIR_TYPE \
and not dir_is_object(metadata):
continue
list_item = []
list_item.append(obj)
if metadata:
list_item.append(metadata[X_TIMESTAMP])
list_item.append(int(metadata[X_CONTENT_LENGTH]))
list_item.append(metadata[X_CONTENT_TYPE])
list_item.append(metadata[X_ETAG])
container_list.append(list_item)
count += 1
if count >= limit:
break
return container_list
def _update_object_count(self):
objects, object_count, bytes_used = get_container_details(self.datadir)
if X_OBJECTS_COUNT not in self.metadata \
or int(self.metadata[X_OBJECTS_COUNT][0]) != object_count \
or X_BYTES_USED not in self.metadata \
or int(self.metadata[X_BYTES_USED][0]) != bytes_used:
self.metadata[X_OBJECTS_COUNT] = (object_count, 0)
self.metadata[X_BYTES_USED] = (bytes_used, 0)
write_metadata(self.datadir, self.metadata)
return objects
def get_info_is_deleted(self):
if not do_exists(self.datadir):
return {}, True
info = self.get_info()
return info, False
def get_info(self):
"""
Get global data for the container.
:returns: dict with keys: account, container, object_count, bytes_used,
hash, id, created_at, put_timestamp, delete_timestamp,
reported_put_timestamp, reported_delete_timestamp,
reported_object_count, and reported_bytes_used.
"""
if self._dir_exists and Glusterfs._container_update_object_count:
self._update_object_count()
data = {'account': self.account, 'container': self.container,
'object_count': self.metadata.get(
X_OBJECTS_COUNT, ('0', 0))[0],
'bytes_used': self.metadata.get(X_BYTES_USED, ('0', 0))[0],
'hash': '', 'id': '', 'created_at': '1',
'put_timestamp': self.metadata.get(
X_PUT_TIMESTAMP, ('0', 0))[0],
'delete_timestamp': '1',
'reported_put_timestamp': '1',
'reported_delete_timestamp': '1',
'reported_object_count': '1', 'reported_bytes_used': '1',
'x_container_sync_point1': self.metadata.get(
'x_container_sync_point1', -1),
'x_container_sync_point2': self.metadata.get(
'x_container_sync_point2', -1),
'storage_policy_index': self.metadata.get(
'storage_policy_index', 0)
}
self._storage_policy_index = data['storage_policy_index']
return data
def put_object(self, name, timestamp, size, content_type, etag, deleted=0):
# NOOP - should never be called since object file creation occurs
# within a directory implicitly.
pass
def initialize(self, timestamp):
"""
Create and write metatdata to directory/container.
:param metadata: Metadata to write.
"""
if not self._dir_exists:
mkdirs(self.datadir)
# If we create it, ensure we own it.
do_chown(self.datadir, self.uid, self.gid)
metadata = get_container_metadata(self.datadir)
metadata[X_TIMESTAMP] = (timestamp, 0)
write_metadata(self.datadir, metadata)
self.metadata = metadata
self._dir_exists = True
def update_put_timestamp(self, timestamp):
"""
Update the PUT timestamp for the container.
If the container does not exist, create it using a PUT timestamp of
the given value.
If the container does exist, update the PUT timestamp only if it is
later than the existing value.
"""
if not do_exists(self.datadir):
self.initialize(timestamp)
else:
if timestamp > self.metadata[X_PUT_TIMESTAMP]:
self.metadata[X_PUT_TIMESTAMP] = (timestamp, 0)
write_metadata(self.datadir, self.metadata)
def delete_object(self, name, timestamp):
# NOOP - should never be called since object file removal occurs
# within a directory implicitly.
return
def delete_db(self, timestamp):
"""
Delete the container (directory) if empty.
:param timestamp: delete timestamp
"""
# Let's check and see if it has directories that
# where created by the code, but not by the
# caller as objects
rmobjdir(self.datadir)
def set_x_container_sync_points(self, sync_point1, sync_point2):
self.metadata['x_container_sync_point1'] = sync_point1
self.metadata['x_container_sync_point2'] = sync_point2
class DiskAccount(DiskCommon):
"""
Usage pattern from account/server.py (Kilo, 2.3.0):
DELETE:
.is_deleted()
.is_status_deleted()
.delete_db()
.is_status_deleted()
PUT:
container:
.db_file
.initialize()
.is_deleted()
.put_container()
account:
.db_file
.initialize()
.is_status_deleted()
.is_status_deleted()
.is_deleted()
.update_put_timestamp()
.is_deleted()
.update_metadata()
HEAD:
.is_deleted()
.is_status_deleted()
.get_info()
.get_policy_stats()
.metadata
GET:
.is_deleted()
.is_status_deleted()
.get_info()
.get_policy_stats()
.metadata
.list_containers_iter()
POST:
.is_deleted()
.is_status_deleted()
.update_metadata()
"""
def __init__(self, root, drive, account, logger, **kwargs):
super(DiskAccount, self).__init__(root, drive, account, logger,
**kwargs)
# Since accounts should always exist (given an account maps to a
# gluster volume directly, and the mount has already been checked at
# the beginning of the REST API handling), just assert that that
# assumption still holds.
assert self._dir_exists_read_metadata()
assert self._dir_exists
if not self.metadata or not validate_account(self.metadata):
create_account_metadata(self.datadir)
self.metadata = _read_metadata(self.datadir)
def is_status_deleted(self):
"""
Only returns true if the status field is set to DELETED.
"""
# This function should always return False. Accounts are not created
# and deleted, they exist if a Gluster volume can be mounted. There is
# no way to delete accounts, so this could never return True.
return False
def initialize(self, timestamp):
"""
Create and write metatdata to directory/account.
:param metadata: Metadata to write.
"""
metadata = get_account_metadata(self.datadir)
metadata[X_TIMESTAMP] = (timestamp, 0)
write_metadata(self.datadir, metadata)
self.metadata = metadata
def update_put_timestamp(self, timestamp):
# Since accounts always exists at this point, just update the account
# PUT timestamp if this given timestamp is later than what we already
# know.
assert self._dir_exists
if timestamp > self.metadata[X_PUT_TIMESTAMP][0]:
self.metadata[X_PUT_TIMESTAMP] = (timestamp, 0)
write_metadata(self.datadir, self.metadata)
def delete_db(self, timestamp):
"""
Mark the account as deleted
:param timestamp: delete timestamp
"""
# Deleting an account is a no-op, since accounts are one-to-one
# mappings to gluster volumes.
#
# FIXME: This means the caller will end up returning a success status
# code for an operation that really should not be allowed. Instead, we
# should modify the account server to not allow the DELETE method, and
# should probably modify the proxy account controller to not allow the
# DELETE method as well.
return
def put_container(self, container, put_timestamp, del_timestamp,
object_count, bytes_used):
"""
Create a container with the given attributes.
:param name: name of the container to create
:param put_timestamp: put_timestamp of the container to create
:param delete_timestamp: delete_timestamp of the container to create
:param object_count: number of objects in the container
:param bytes_used: number of bytes used by the container
"""
# NOOP - should never be called since container directory creation
# occurs from within the account directory implicitly.
return
def _update_container_count(self):
containers, container_count = get_account_details(self.datadir)
if X_CONTAINER_COUNT not in self.metadata \
or int(self.metadata[X_CONTAINER_COUNT][0]) != container_count:
self.metadata[X_CONTAINER_COUNT] = (container_count, 0)
write_metadata(self.datadir, self.metadata)
return containers
def list_containers_iter(self, limit, marker, end_marker,
prefix, delimiter):
"""
Return tuple of name, object_count, bytes_used, 0(is_subdir).
Used by account server.
"""
if delimiter and not prefix:
prefix = ''
account_list = []
containers = self._update_container_count()
if containers:
containers.sort()
else:
return account_list
if containers and end_marker:
containers = filter_end_marker(containers, end_marker)
if containers:
if marker and marker >= prefix:
containers = filter_marker(containers, marker)
elif prefix:
containers = filter_prefix_as_marker(containers, prefix)
if prefix is None:
# No prefix, we don't need to apply the other arguments, we just
# return what we have.
pass
else:
# We have a non-None (for all intents and purposes it is a string)
# prefix.
if not delimiter:
if not prefix:
# We have nothing more to do
pass
else:
containers = filter_prefix(containers, prefix)
else:
containers = filter_delimiter(containers, delimiter, prefix,
marker)
count = 0
for cont in containers:
list_item = []
metadata = None
list_item.append(cont)
cont_path = os.path.join(self.datadir, cont)
metadata = _read_metadata(cont_path)
if not metadata or not validate_container(metadata):
try:
metadata = create_container_metadata(cont_path)
except OSError as e:
# FIXME - total hack to get upstream swift ported unit
# test cases working for now.
if e.errno not in (errno.ENOENT, errno.ESTALE):
raise
if metadata:
list_item.append(metadata[X_OBJECTS_COUNT][0])
list_item.append(metadata[X_BYTES_USED][0])
list_item.append(0)
account_list.append(list_item)
count += 1
if count >= limit:
break
return account_list
def get_info(self):
"""
Get global data for the account.
:returns: dict with keys: account, created_at, put_timestamp,
delete_timestamp, container_count, object_count,
bytes_used, hash, id
"""
if Glusterfs._account_update_container_count:
self._update_container_count()
data = {'account': self.account, 'created_at': '1',
'put_timestamp': '1', 'delete_timestamp': '1',
'container_count': self.metadata.get(
X_CONTAINER_COUNT, (0, 0))[0],
'object_count': self.metadata.get(X_OBJECTS_COUNT, (0, 0))[0],
'bytes_used': self.metadata.get(X_BYTES_USED, (0, 0))[0],
'hash': '', 'id': ''}
return data
def get_policy_stats(self, do_migrations=False):
return {}
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