# Copyright (c) 2012 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, errno from gluster.swift.common.utils import clean_metadata, dir_empty, rmdirs, \ mkdirs, validate_account, validate_container, is_marker, \ get_container_details, get_account_details, get_container_metadata, \ create_container_metadata, create_account_metadata, DEFAULT_GID, \ DEFAULT_UID, validate_object, create_object_metadata, read_metadata, \ write_metadata, X_CONTENT_TYPE, X_CONTENT_LENGTH, X_TIMESTAMP, \ X_PUT_TIMESTAMP, X_TYPE, X_ETAG, X_OBJECTS_COUNT, X_BYTES_USED, \ X_CONTAINER_COUNT, CONTAINER, os_path from gluster.swift.common import Glusterfs from swift.common.constraints import CONTAINER_LISTING_LIMIT from swift.common.utils import normalize_timestamp, TRUE_VALUES DATADIR = 'containers' # Create a dummy db_file in /etc/swift _unittests_enabled = os.getenv('GLUSTER_UNIT_TEST_ENABLED', 'no') if _unittests_enabled in TRUE_VALUES: _tmp_dir = '/tmp/gluster_unit_tests' try: os.mkdir(_tmp_dir) except OSError as e: if e.errno != errno.EEXIST: raise _db_file = os.path.join(_tmp_dir, 'db_file.db') else: _db_file = '/etc/swift/db_file.db' if not os.path.exists(_db_file): file(_db_file, 'w+') 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 class DiskCommon(object): def is_deleted(self): return not os_path.exists(self.datadir) def filter_prefix(self, objects, prefix): """ Accept sorted list. """ found = 0 filtered_objs = [] for object_name in objects: if object_name.startswith(prefix): filtered_objs.append(object_name) found = 1 else: if found: break return filtered_objs def filter_delimiter(self, objects, delimiter, prefix): """ Accept sorted list. Objects should start with prefix. """ filtered_objs=[] for object_name in objects: tmp_obj = object_name.replace(prefix, '', 1) sufix = tmp_obj.split(delimiter, 1) new_obj = prefix + sufix[0] if new_obj and new_obj not in filtered_objs: filtered_objs.append(new_obj) return filtered_objs def filter_marker(self, objects, marker): """ TODO: We can traverse in reverse order to optimize. Accept sorted list. """ filtered_objs=[] found = 0 if objects[-1] < marker: return filtered_objs for object_name in objects: if object_name > marker: filtered_objs.append(object_name) return filtered_objs def filter_end_marker(self, objects, end_marker): """ Accept sorted list. """ filtered_objs=[] for object_name in objects: if object_name < end_marker: filtered_objs.append(object_name) else: break return filtered_objs def filter_limit(self, objects, limit): filtered_objs=[] for i in range(0, limit): filtered_objs.append(objects[i]) return filtered_objs 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 """ def __init__(self, path, drive, account, container, logger, uid=DEFAULT_UID, gid=DEFAULT_GID): self.root = path if container: self.container = container else: self.container = None if self.container: self.datadir = os.path.join(path, drive, self.container) else: self.datadir = os.path.join(path, drive) self.account = account assert logger is not None self.logger = logger self.metadata = {} self.container_info = None self.object_info = None self.uid = int(uid) self.gid = int(gid) self.db_file = _db_file self.dir_exists = os_path.exists(self.datadir) if self.dir_exists: try: self.metadata = _read_metadata(self.datadir) except EOFError: create_container_metadata(self.datadir) else: return if self.container: 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) else: if not self.metadata: create_account_metadata(self.datadir) self.metadata = _read_metadata(self.datadir) else: if not validate_account(self.metadata): create_account_metadata(self.datadir) self.metadata = _read_metadata(self.datadir) def empty(self): return dir_empty(self.datadir) def delete(self): if self.empty(): #For delete account. if os_path.ismount(self.datadir): clean_metadata(self.datadir) else: rmdirs(self.datadir) self.dir_exists = False def put_metadata(self, metadata): """ Write metadata to directory/container. """ write_metadata(self.datadir, metadata) self.metadata = metadata def put(self, metadata): """ Create and write metatdata to directory/container. :param metadata: Metadata to write. """ if not self.dir_exists: mkdirs(self.datadir) os.chown(self.datadir, self.uid, self.gid) write_metadata(self.datadir, metadata) self.metadata = metadata self.dir_exists = True def put_obj(self, content_length, timestamp): ocnt = self.metadata[X_OBJECTS_COUNT][0] self.metadata[X_OBJECTS_COUNT] = (int(ocnt) + 1, timestamp) self.metadata[X_PUT_TIMESTAMP] = timestamp bused = self.metadata[X_BYTES_USED][0] self.metadata[X_BYTES_USED] = (int(bused) + int(content_length), timestamp) #TODO: define update_metadata instad of writing whole metadata again. self.put_metadata(self.metadata) def delete_obj(self, content_length): ocnt, timestamp = self.metadata[X_OBJECTS_COUNT][0] self.metadata[X_OBJECTS_COUNT] = (int(ocnt) - 1, timestamp) bused, timestamp = self.metadata[X_BYTES_USED] self.metadata[X_BYTES_USED] = (int(bused) - int(content_length), timestamp) self.put_metadata(self.metadata) def put_container(self, container, put_timestamp, del_timestamp, object_count, bytes_used): """ For account server. """ self.metadata[X_OBJECTS_COUNT] = (0, put_timestamp) self.metadata[X_BYTES_USED] = (0, put_timestamp) ccnt = self.metadata[X_CONTAINER_COUNT][0] self.metadata[X_CONTAINER_COUNT] = (int(ccnt) + 1, put_timestamp) self.metadata[X_PUT_TIMESTAMP] = (1, put_timestamp) self.put_metadata(self.metadata) def delete_container(self, object_count, bytes_used): """ For account server. """ self.metadata[X_OBJECTS_COUNT] = (0, 0) self.metadata[X_BYTES_USED] = (0, 0) ccnt, timestamp = self.metadata[X_CONTAINER_COUNT] self.metadata[X_CONTAINER_COUNT] = (int(ccnt) - 1, timestamp) self.put_metadata(self.metadata) def unlink(self): """ Remove directory/container if empty. """ if dir_empty(self.datadir): rmdirs(self.datadir) def list_objects_iter(self, limit, marker, end_marker, prefix, delimiter, path): """ Returns tuple of name, created_at, size, content_type, etag. """ if path: prefix = path = path.rstrip('/') + '/' delimiter = '/' if delimiter and not prefix: prefix = '' self.update_object_count() objects, object_count, bytes_used = self.object_info if objects and prefix: objects = self.filter_prefix(objects, prefix) if objects and delimiter: objects = self.filter_delimiter(objects, delimiter, prefix) if objects and marker: objects = self.filter_marker(objects, marker) if objects and end_marker: objects = self.filter_end_marker(objects, end_marker) if objects and limit: if len(objects) > limit: objects = self.filter_limit(objects, limit) container_list = [] if objects: for obj in objects: list_item = [] list_item.append(obj) obj_path = os.path.join(self.datadir, obj) metadata = read_metadata(obj_path) if not metadata or not validate_object(metadata): metadata = create_object_metadata(obj_path) 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) return container_list def update_object_count(self): if not self.object_info: self.object_info = get_container_details(self.datadir) objects, object_count, bytes_used = self.object_info 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) def update_container_count(self): if not self.container_info: self.container_info = get_account_details(self.datadir) containers, container_count = self.container_info 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) def get_info(self, include_metadata=False): """ 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 include_metadata is set, metadata is included as a key pointing to a dict of tuples of the metadata """ # TODO: delete_timestamp, reported_put_timestamp # reported_delete_timestamp, reported_object_count, # reported_bytes_used, created_at if not Glusterfs.OBJECT_ONLY: # If we are not configured for object only environments, we should # update the object counts in case they changed behind our back. 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'} if include_metadata: data['metadata'] = self.metadata return data def put_object(self, name, timestamp, size, content_type, etag, deleted=0): # TODO: Implement the specifics of this func. pass def initialize(self, timestamp): pass def update_put_timestamp(self, timestamp): """ Create the container if it doesn't exist and update the timestamp """ if not os_path.exists(self.datadir): self.put(self.metadata) def delete_object(self, name, timestamp): # TODO: Implement the delete object pass def delete_db(self, timestamp): """ Delete the container """ self.unlink() def update_metadata(self, metadata): 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 new_metadata != self.metadata: write_metadata(self.datadir, new_metadata) self.metadata = new_metadata class DiskAccount(DiskDir): def __init__(self, root, drive, account, logger): super(DiskAccount, self).__init__(root, drive, account, None, logger) assert self.dir_exists 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 = '' self.update_container_count() containers, container_count = self.container_info if containers: containers.sort() if containers and prefix: containers = self.filter_prefix(containers, prefix) if containers and delimiter: containers = self.filter_delimiter(containers, delimiter, prefix) if containers and marker: containers = self.filter_marker(containers, marker) if containers and end_marker: containers = self.filter_end_marker(containers, end_marker) if containers and limit: if len(containers) > limit: containers = self.filter_limit(containers, limit) account_list = [] if containers: 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): metadata = create_container_metadata(cont_path) 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) return account_list def get_info(self, include_metadata=False): """ 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 not Glusterfs.OBJECT_ONLY: # If we are not configured for object only environments, we should # update the container counts in case they changed behind our back. 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' : ''} if include_metadata: data['metadata'] = self.metadata return data def get_container_timestamp(self, container): cont_path = os.path.join(self.datadir, container) metadata = read_metadata(cont_path) return int(metadata.get(X_PUT_TIMESTAMP, ('0',0))[0]) or None