599 lines
27 KiB
Python
599 lines
27 KiB
Python
# Copyright (c) 2010-2012 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import time
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import traceback
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from swift import gettext_ as _
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from xml.etree.cElementTree import Element, SubElement, tostring
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from eventlet import Timeout
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import swift.common.db
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from swift.container.backend import ContainerBroker, DATADIR
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from swift.container.replicator import ContainerReplicatorRpc
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from swift.common.db import DatabaseAlreadyExists
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from swift.common.container_sync_realms import ContainerSyncRealms
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from swift.common.request_helpers import get_param, get_listing_content_type, \
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split_and_validate_path, is_sys_or_user_meta
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from swift.common.utils import get_logger, hash_path, public, \
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Timestamp, storage_directory, validate_sync_to, \
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config_true_value, json, timing_stats, replication, \
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override_bytes_from_content_type, get_log_line
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from swift.common.constraints import check_mount, valid_timestamp, check_utf8
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from swift.common import constraints
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from swift.common.bufferedhttp import http_connect
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from swift.common.exceptions import ConnectionTimeout
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from swift.common.http import HTTP_NOT_FOUND, is_success
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from swift.common.storage_policy import POLICIES
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from swift.common.swob import HTTPAccepted, HTTPBadRequest, HTTPConflict, \
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HTTPCreated, HTTPInternalServerError, HTTPNoContent, HTTPNotFound, \
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HTTPPreconditionFailed, HTTPMethodNotAllowed, Request, Response, \
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HTTPInsufficientStorage, HTTPException, HeaderKeyDict
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def gen_resp_headers(info, is_deleted=False):
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"""
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Convert container info dict to headers.
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"""
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# backend headers are always included
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headers = {
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'X-Backend-Timestamp': Timestamp(info.get('created_at', 0)).internal,
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'X-Backend-PUT-Timestamp': Timestamp(info.get(
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'put_timestamp', 0)).internal,
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'X-Backend-DELETE-Timestamp': Timestamp(
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info.get('delete_timestamp', 0)).internal,
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'X-Backend-Status-Changed-At': Timestamp(
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info.get('status_changed_at', 0)).internal,
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'X-Backend-Storage-Policy-Index': info.get('storage_policy_index', 0),
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}
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if not is_deleted:
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# base container info on deleted containers is not exposed to client
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headers.update({
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'X-Container-Object-Count': info.get('object_count', 0),
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'X-Container-Bytes-Used': info.get('bytes_used', 0),
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'X-Timestamp': Timestamp(info.get('created_at', 0)).normal,
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'X-PUT-Timestamp': Timestamp(
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info.get('put_timestamp', 0)).normal,
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})
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return headers
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class ContainerController(object):
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"""WSGI Controller for the container server."""
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# Ensure these are all lowercase
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save_headers = ['x-container-read', 'x-container-write',
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'x-container-sync-key', 'x-container-sync-to']
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def __init__(self, conf, logger=None):
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self.logger = logger or get_logger(conf, log_route='container-server')
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self.log_requests = config_true_value(conf.get('log_requests', 'true'))
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self.root = conf.get('devices', '/srv/node')
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self.mount_check = config_true_value(conf.get('mount_check', 'true'))
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self.node_timeout = int(conf.get('node_timeout', 3))
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self.conn_timeout = float(conf.get('conn_timeout', 0.5))
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replication_server = conf.get('replication_server', None)
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if replication_server is not None:
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replication_server = config_true_value(replication_server)
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self.replication_server = replication_server
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#: ContainerSyncCluster instance for validating sync-to values.
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self.realms_conf = ContainerSyncRealms(
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os.path.join(
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conf.get('swift_dir', '/etc/swift'),
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'container-sync-realms.conf'),
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self.logger)
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#: The list of hosts we're allowed to send syncs to. This can be
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#: overridden by data in self.realms_conf
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self.allowed_sync_hosts = [
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h.strip()
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for h in conf.get('allowed_sync_hosts', '127.0.0.1').split(',')
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if h.strip()]
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self.replicator_rpc = ContainerReplicatorRpc(
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self.root, DATADIR, ContainerBroker, self.mount_check,
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logger=self.logger)
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self.auto_create_account_prefix = \
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conf.get('auto_create_account_prefix') or '.'
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if config_true_value(conf.get('allow_versions', 'f')):
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self.save_headers.append('x-versions-location')
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swift.common.db.DB_PREALLOCATION = \
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config_true_value(conf.get('db_preallocation', 'f'))
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def _get_container_broker(self, drive, part, account, container, **kwargs):
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"""
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Get a DB broker for the container.
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:param drive: drive that holds the container
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:param part: partition the container is in
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:param account: account name
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:param container: container name
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:returns: ContainerBroker object
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"""
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hsh = hash_path(account, container)
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db_dir = storage_directory(DATADIR, part, hsh)
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db_path = os.path.join(self.root, drive, db_dir, hsh + '.db')
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kwargs.setdefault('account', account)
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kwargs.setdefault('container', container)
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kwargs.setdefault('logger', self.logger)
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return ContainerBroker(db_path, **kwargs)
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def get_and_validate_policy_index(self, req):
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"""
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Validate that the index supplied maps to a policy.
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:returns: policy index from request, or None if not present
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:raises: HTTPBadRequest if the supplied index is bogus
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"""
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policy_index = req.headers.get('X-Backend-Storage-Policy-Index', None)
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if policy_index is None:
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return None
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try:
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policy_index = int(policy_index)
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except ValueError:
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raise HTTPBadRequest(
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request=req, content_type="text/plain",
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body=("Invalid X-Storage-Policy-Index %r" % policy_index))
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policy = POLICIES.get_by_index(policy_index)
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if policy is None:
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raise HTTPBadRequest(
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request=req, content_type="text/plain",
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body=("Invalid X-Storage-Policy-Index %r" % policy_index))
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return int(policy)
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def account_update(self, req, account, container, broker):
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"""
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Update the account server(s) with latest container info.
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:param req: swob.Request object
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:param account: account name
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:param container: container name
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:param broker: container DB broker object
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:returns: if all the account requests return a 404 error code,
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HTTPNotFound response object,
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if the account cannot be updated due to a malformed header,
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an HTTPBadRequest response object,
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otherwise None.
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"""
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account_hosts = [h.strip() for h in
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req.headers.get('X-Account-Host', '').split(',')]
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account_devices = [d.strip() for d in
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req.headers.get('X-Account-Device', '').split(',')]
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account_partition = req.headers.get('X-Account-Partition', '')
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if len(account_hosts) != len(account_devices):
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# This shouldn't happen unless there's a bug in the proxy,
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# but if there is, we want to know about it.
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self.logger.error(_('ERROR Account update failed: different '
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'numbers of hosts and devices in request: '
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'"%s" vs "%s"') %
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(req.headers.get('X-Account-Host', ''),
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req.headers.get('X-Account-Device', '')))
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return HTTPBadRequest(req=req)
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if account_partition:
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updates = zip(account_hosts, account_devices)
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else:
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updates = []
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account_404s = 0
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for account_host, account_device in updates:
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account_ip, account_port = account_host.rsplit(':', 1)
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new_path = '/' + '/'.join([account, container])
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info = broker.get_info()
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account_headers = HeaderKeyDict({
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'x-put-timestamp': info['put_timestamp'],
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'x-delete-timestamp': info['delete_timestamp'],
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'x-object-count': info['object_count'],
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'x-bytes-used': info['bytes_used'],
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'x-trans-id': req.headers.get('x-trans-id', '-'),
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'X-Backend-Storage-Policy-Index': info['storage_policy_index'],
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'user-agent': 'container-server %s' % os.getpid(),
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'referer': req.as_referer()})
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if req.headers.get('x-account-override-deleted', 'no').lower() == \
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'yes':
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account_headers['x-account-override-deleted'] = 'yes'
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try:
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with ConnectionTimeout(self.conn_timeout):
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conn = http_connect(
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account_ip, account_port, account_device,
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account_partition, 'PUT', new_path, account_headers)
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with Timeout(self.node_timeout):
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account_response = conn.getresponse()
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account_response.read()
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if account_response.status == HTTP_NOT_FOUND:
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account_404s += 1
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elif not is_success(account_response.status):
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self.logger.error(_(
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'ERROR Account update failed '
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'with %(ip)s:%(port)s/%(device)s (will retry '
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'later): Response %(status)s %(reason)s'),
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{'ip': account_ip, 'port': account_port,
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'device': account_device,
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'status': account_response.status,
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'reason': account_response.reason})
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except (Exception, Timeout):
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self.logger.exception(_(
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'ERROR account update failed with '
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'%(ip)s:%(port)s/%(device)s (will retry later)'),
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{'ip': account_ip, 'port': account_port,
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'device': account_device})
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if updates and account_404s == len(updates):
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return HTTPNotFound(req=req)
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else:
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return None
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@public
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@timing_stats()
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def DELETE(self, req):
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"""Handle HTTP DELETE request."""
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drive, part, account, container, obj = split_and_validate_path(
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req, 4, 5, True)
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req_timestamp = valid_timestamp(req)
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if self.mount_check and not check_mount(self.root, drive):
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return HTTPInsufficientStorage(drive=drive, request=req)
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# policy index is only relevant for delete_obj (and transitively for
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# auto create accounts)
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obj_policy_index = self.get_and_validate_policy_index(req) or 0
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broker = self._get_container_broker(drive, part, account, container)
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if account.startswith(self.auto_create_account_prefix) and obj and \
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not os.path.exists(broker.db_file):
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try:
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broker.initialize(req_timestamp.internal, obj_policy_index)
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except DatabaseAlreadyExists:
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pass
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if not os.path.exists(broker.db_file):
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return HTTPNotFound()
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if obj: # delete object
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broker.delete_object(obj, req.headers.get('x-timestamp'),
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obj_policy_index)
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return HTTPNoContent(request=req)
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else:
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# delete container
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if not broker.empty():
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return HTTPConflict(request=req)
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existed = Timestamp(broker.get_info()['put_timestamp']) and \
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not broker.is_deleted()
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broker.delete_db(req_timestamp.internal)
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if not broker.is_deleted():
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return HTTPConflict(request=req)
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resp = self.account_update(req, account, container, broker)
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if resp:
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return resp
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if existed:
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return HTTPNoContent(request=req)
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return HTTPNotFound()
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def _update_or_create(self, req, broker, timestamp, new_container_policy,
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requested_policy_index):
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"""
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Create new database broker or update timestamps for existing database.
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:param req: the swob request object
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:param broker: the broker instance for the container
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:param timestamp: internalized timestamp
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:param new_container_policy: the storage policy index to use
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when creating the container
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:param requested_policy_index: the storage policy index sent in the
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request, may be None
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:returns: created, a bool, if database did not previously exist
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"""
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if not os.path.exists(broker.db_file):
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try:
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broker.initialize(timestamp, new_container_policy)
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except DatabaseAlreadyExists:
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pass
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else:
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return True # created
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recreated = broker.is_deleted()
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if recreated:
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# only set storage policy on deleted containers
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broker.set_storage_policy_index(new_container_policy,
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timestamp=timestamp)
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elif requested_policy_index is not None:
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# validate requested policy with existing container
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if requested_policy_index != broker.storage_policy_index:
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raise HTTPConflict(request=req)
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broker.update_put_timestamp(timestamp)
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if broker.is_deleted():
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raise HTTPConflict(request=req)
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if recreated:
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broker.update_status_changed_at(timestamp)
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return recreated
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@public
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@timing_stats()
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def PUT(self, req):
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"""Handle HTTP PUT request."""
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drive, part, account, container, obj = split_and_validate_path(
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req, 4, 5, True)
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req_timestamp = valid_timestamp(req)
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if 'x-container-sync-to' in req.headers:
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err, sync_to, realm, realm_key = validate_sync_to(
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req.headers['x-container-sync-to'], self.allowed_sync_hosts,
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self.realms_conf)
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if err:
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return HTTPBadRequest(err)
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if self.mount_check and not check_mount(self.root, drive):
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return HTTPInsufficientStorage(drive=drive, request=req)
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requested_policy_index = self.get_and_validate_policy_index(req)
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broker = self._get_container_broker(drive, part, account, container)
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if obj: # put container object
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# obj put expects the policy_index header, default is for
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# legacy support during upgrade.
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obj_policy_index = requested_policy_index or 0
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if account.startswith(self.auto_create_account_prefix) and \
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not os.path.exists(broker.db_file):
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try:
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broker.initialize(req_timestamp.internal, obj_policy_index)
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except DatabaseAlreadyExists:
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pass
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if not os.path.exists(broker.db_file):
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return HTTPNotFound()
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broker.put_object(obj, req_timestamp.internal,
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int(req.headers['x-size']),
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req.headers['x-content-type'],
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req.headers['x-etag'], 0,
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obj_policy_index)
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return HTTPCreated(request=req)
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else: # put container
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if requested_policy_index is None:
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# use the default index sent by the proxy if available
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new_container_policy = req.headers.get(
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'X-Backend-Storage-Policy-Default', int(POLICIES.default))
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else:
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new_container_policy = requested_policy_index
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created = self._update_or_create(req, broker,
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req_timestamp.internal,
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new_container_policy,
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requested_policy_index)
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metadata = {}
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metadata.update(
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(key, (value, req_timestamp.internal))
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for key, value in req.headers.iteritems()
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if key.lower() in self.save_headers or
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is_sys_or_user_meta('container', key))
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if 'X-Container-Sync-To' in metadata:
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if 'X-Container-Sync-To' not in broker.metadata or \
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metadata['X-Container-Sync-To'][0] != \
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broker.metadata['X-Container-Sync-To'][0]:
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broker.set_x_container_sync_points(-1, -1)
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broker.update_metadata(metadata, validate_metadata=True)
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resp = self.account_update(req, account, container, broker)
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if resp:
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return resp
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if created:
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return HTTPCreated(request=req)
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else:
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return HTTPAccepted(request=req)
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@public
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@timing_stats(sample_rate=0.1)
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def HEAD(self, req):
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"""Handle HTTP HEAD request."""
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drive, part, account, container, obj = split_and_validate_path(
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req, 4, 5, True)
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out_content_type = get_listing_content_type(req)
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if self.mount_check and not check_mount(self.root, drive):
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return HTTPInsufficientStorage(drive=drive, request=req)
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broker = self._get_container_broker(drive, part, account, container,
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pending_timeout=0.1,
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stale_reads_ok=True)
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info, is_deleted = broker.get_info_is_deleted()
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headers = gen_resp_headers(info, is_deleted=is_deleted)
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if is_deleted:
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return HTTPNotFound(request=req, headers=headers)
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headers.update(
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(key, value)
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for key, (value, timestamp) in broker.metadata.iteritems()
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if value != '' and (key.lower() in self.save_headers or
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is_sys_or_user_meta('container', key)))
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headers['Content-Type'] = out_content_type
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return HTTPNoContent(request=req, headers=headers, charset='utf-8')
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def update_data_record(self, record):
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"""
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Perform any mutations to container listing records that are common to
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all serialization formats, and returns it as a dict.
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Converts created time to iso timestamp.
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Replaces size with 'swift_bytes' content type parameter.
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:params record: object entry record
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:returns: modified record
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"""
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(name, created, size, content_type, etag) = record[:5]
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if content_type is None:
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return {'subdir': name}
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response = {'bytes': size, 'hash': etag, 'name': name,
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'content_type': content_type}
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response['last_modified'] = Timestamp(created).isoformat
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override_bytes_from_content_type(response, logger=self.logger)
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return response
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@public
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@timing_stats()
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def GET(self, req):
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"""Handle HTTP GET request."""
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drive, part, account, container, obj = split_and_validate_path(
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req, 4, 5, True)
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path = get_param(req, 'path')
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prefix = get_param(req, 'prefix')
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delimiter = get_param(req, 'delimiter')
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if delimiter and (len(delimiter) > 1 or ord(delimiter) > 254):
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# delimiters can be made more flexible later
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return HTTPPreconditionFailed(body='Bad delimiter')
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marker = get_param(req, 'marker', '')
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end_marker = get_param(req, 'end_marker')
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limit = constraints.CONTAINER_LISTING_LIMIT
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given_limit = get_param(req, 'limit')
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if given_limit and given_limit.isdigit():
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limit = int(given_limit)
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if limit > constraints.CONTAINER_LISTING_LIMIT:
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return HTTPPreconditionFailed(
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request=req,
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body='Maximum limit is %d'
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% constraints.CONTAINER_LISTING_LIMIT)
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out_content_type = get_listing_content_type(req)
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if self.mount_check and not check_mount(self.root, drive):
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return HTTPInsufficientStorage(drive=drive, request=req)
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broker = self._get_container_broker(drive, part, account, container,
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|
pending_timeout=0.1,
|
|
stale_reads_ok=True)
|
|
info, is_deleted = broker.get_info_is_deleted()
|
|
resp_headers = gen_resp_headers(info, is_deleted=is_deleted)
|
|
if is_deleted:
|
|
return HTTPNotFound(request=req, headers=resp_headers)
|
|
container_list = broker.list_objects_iter(
|
|
limit, marker, end_marker, prefix, delimiter, path,
|
|
storage_policy_index=info['storage_policy_index'])
|
|
return self.create_listing(req, out_content_type, info, resp_headers,
|
|
broker.metadata, container_list, container)
|
|
|
|
def create_listing(self, req, out_content_type, info, resp_headers,
|
|
metadata, container_list, container):
|
|
for key, (value, timestamp) in metadata.iteritems():
|
|
if value and (key.lower() in self.save_headers or
|
|
is_sys_or_user_meta('container', key)):
|
|
resp_headers[key] = value
|
|
ret = Response(request=req, headers=resp_headers,
|
|
content_type=out_content_type, charset='utf-8')
|
|
if out_content_type == 'application/json':
|
|
ret.body = json.dumps([self.update_data_record(record)
|
|
for record in container_list])
|
|
elif out_content_type.endswith('/xml'):
|
|
doc = Element('container', name=container.decode('utf-8'))
|
|
for obj in container_list:
|
|
record = self.update_data_record(obj)
|
|
if 'subdir' in record:
|
|
name = record['subdir'].decode('utf-8')
|
|
sub = SubElement(doc, 'subdir', name=name)
|
|
SubElement(sub, 'name').text = name
|
|
else:
|
|
obj_element = SubElement(doc, 'object')
|
|
for field in ["name", "hash", "bytes", "content_type",
|
|
"last_modified"]:
|
|
SubElement(obj_element, field).text = str(
|
|
record.pop(field)).decode('utf-8')
|
|
for field in sorted(record):
|
|
SubElement(obj_element, field).text = str(
|
|
record[field]).decode('utf-8')
|
|
ret.body = tostring(doc, encoding='UTF-8').replace(
|
|
"<?xml version='1.0' encoding='UTF-8'?>",
|
|
'<?xml version="1.0" encoding="UTF-8"?>', 1)
|
|
else:
|
|
if not container_list:
|
|
return HTTPNoContent(request=req, headers=resp_headers)
|
|
ret.body = '\n'.join(rec[0] for rec in container_list) + '\n'
|
|
return ret
|
|
|
|
@public
|
|
@replication
|
|
@timing_stats(sample_rate=0.01)
|
|
def REPLICATE(self, req):
|
|
"""
|
|
Handle HTTP REPLICATE request (json-encoded RPC calls for replication.)
|
|
"""
|
|
post_args = split_and_validate_path(req, 3)
|
|
drive, partition, hash = post_args
|
|
if self.mount_check and not check_mount(self.root, drive):
|
|
return HTTPInsufficientStorage(drive=drive, request=req)
|
|
try:
|
|
args = json.load(req.environ['wsgi.input'])
|
|
except ValueError as err:
|
|
return HTTPBadRequest(body=str(err), content_type='text/plain')
|
|
ret = self.replicator_rpc.dispatch(post_args, args)
|
|
ret.request = req
|
|
return ret
|
|
|
|
@public
|
|
@timing_stats()
|
|
def POST(self, req):
|
|
"""Handle HTTP POST request."""
|
|
drive, part, account, container = split_and_validate_path(req, 4)
|
|
req_timestamp = valid_timestamp(req)
|
|
if 'x-container-sync-to' in req.headers:
|
|
err, sync_to, realm, realm_key = validate_sync_to(
|
|
req.headers['x-container-sync-to'], self.allowed_sync_hosts,
|
|
self.realms_conf)
|
|
if err:
|
|
return HTTPBadRequest(err)
|
|
if self.mount_check and not check_mount(self.root, drive):
|
|
return HTTPInsufficientStorage(drive=drive, request=req)
|
|
broker = self._get_container_broker(drive, part, account, container)
|
|
if broker.is_deleted():
|
|
return HTTPNotFound(request=req)
|
|
metadata = {}
|
|
metadata.update(
|
|
(key, (value, req_timestamp.internal))
|
|
for key, value in req.headers.iteritems()
|
|
if key.lower() in self.save_headers or
|
|
is_sys_or_user_meta('container', key))
|
|
if metadata:
|
|
if 'X-Container-Sync-To' in metadata:
|
|
if 'X-Container-Sync-To' not in broker.metadata or \
|
|
metadata['X-Container-Sync-To'][0] != \
|
|
broker.metadata['X-Container-Sync-To'][0]:
|
|
broker.set_x_container_sync_points(-1, -1)
|
|
broker.update_metadata(metadata, validate_metadata=True)
|
|
return HTTPNoContent(request=req)
|
|
|
|
def __call__(self, env, start_response):
|
|
start_time = time.time()
|
|
req = Request(env)
|
|
self.logger.txn_id = req.headers.get('x-trans-id', None)
|
|
if not check_utf8(req.path_info):
|
|
res = HTTPPreconditionFailed(body='Invalid UTF8 or contains NULL')
|
|
else:
|
|
try:
|
|
# disallow methods which have not been marked 'public'
|
|
try:
|
|
method = getattr(self, req.method)
|
|
getattr(method, 'publicly_accessible')
|
|
replication_method = getattr(method, 'replication', False)
|
|
if (self.replication_server is not None and
|
|
self.replication_server != replication_method):
|
|
raise AttributeError('Not allowed method.')
|
|
except AttributeError:
|
|
res = HTTPMethodNotAllowed()
|
|
else:
|
|
res = method(req)
|
|
except HTTPException as error_response:
|
|
res = error_response
|
|
except (Exception, Timeout):
|
|
self.logger.exception(_(
|
|
'ERROR __call__ error with %(method)s %(path)s '),
|
|
{'method': req.method, 'path': req.path})
|
|
res = HTTPInternalServerError(body=traceback.format_exc())
|
|
if self.log_requests:
|
|
trans_time = time.time() - start_time
|
|
log_message = get_log_line(req, res, trans_time, '')
|
|
if req.method.upper() == 'REPLICATE':
|
|
self.logger.debug(log_message)
|
|
else:
|
|
self.logger.info(log_message)
|
|
return res(env, start_response)
|
|
|
|
|
|
def app_factory(global_conf, **local_conf):
|
|
"""paste.deploy app factory for creating WSGI container server apps"""
|
|
conf = global_conf.copy()
|
|
conf.update(local_conf)
|
|
return ContainerController(conf)
|