This file is indexed.

/usr/share/pyshared/swift/obj/server.py is in python-swift 1.4.8-0ubuntu2.5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
# Copyright (c) 2010-2012 OpenStack, LLC.
#
# 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.

""" Object Server for Swift """

from __future__ import with_statement
import cPickle as pickle
import errno
import os
import time
import traceback
from datetime import datetime
from hashlib import md5
from tempfile import mkstemp
from urllib import unquote
from contextlib import contextmanager

from webob import Request, Response, UTC
from webob.exc import HTTPAccepted, HTTPBadRequest, HTTPCreated, \
    HTTPInternalServerError, HTTPNoContent, HTTPNotFound, HTTPConflict, \
    HTTPNotModified, HTTPPreconditionFailed, \
    HTTPRequestTimeout, HTTPUnprocessableEntity, HTTPMethodNotAllowed
from xattr import getxattr, setxattr
from eventlet import sleep, Timeout, tpool

from swift.common.utils import mkdirs, normalize_timestamp, \
    storage_directory, hash_path, renamer, fallocate, \
    split_path, drop_buffer_cache, get_logger, write_pickle
from swift.common.bufferedhttp import http_connect
from swift.common.constraints import check_object_creation, check_mount, \
    check_float, check_utf8
from swift.common.exceptions import ConnectionTimeout, DiskFileError, \
    DiskFileNotExist
from swift.obj.replicator import tpooled_get_hashes, invalidate_hash, \
    quarantine_renamer


DATADIR = 'objects'
ASYNCDIR = 'async_pending'
PICKLE_PROTOCOL = 2
METADATA_KEY = 'user.swift.metadata'
MAX_OBJECT_NAME_LENGTH = 1024
KEEP_CACHE_SIZE = (5 * 1024 * 1024)
# keep these lower-case
DISALLOWED_HEADERS = set('content-length content-type deleted etag'.split())


def read_metadata(fd):
    """
    Helper function to read the pickled metadata from an object file.

    :param fd: file descriptor to load the metadata from

    :returns: dictionary of metadata
    """
    metadata = ''
    key = 0
    try:
        while True:
            metadata += getxattr(fd, '%s%s' % (METADATA_KEY, (key or '')))
            key += 1
    except IOError:
        pass
    return pickle.loads(metadata)


def write_metadata(fd, metadata):
    """
    Helper function to write pickled metadata for an object file.

    :param fd: file descriptor to write the metadata
    :param metadata: metadata to write
    """
    metastr = pickle.dumps(metadata, PICKLE_PROTOCOL)
    key = 0
    while metastr:
        setxattr(fd, '%s%s' % (METADATA_KEY, key or ''), metastr[:254])
        metastr = metastr[254:]
        key += 1


class DiskFile(object):
    """
    Manage object files on disk.

    :param path: path to devices on the node
    :param device: device name
    :param partition: partition on the device the object lives in
    :param account: account name for the object
    :param container: container name for the object
    :param obj: object name for the object
    :param keep_data_fp: if True, don't close the fp, otherwise close it
    :param disk_chunk_Size: size of chunks on file reads
    """

    def __init__(self, path, device, partition, account, container, obj,
                 logger, keep_data_fp=False, disk_chunk_size=65536):
        self.disk_chunk_size = disk_chunk_size
        self.name = '/' + '/'.join((account, container, obj))
        name_hash = hash_path(account, container, obj)
        self.datadir = os.path.join(path, device,
                    storage_directory(DATADIR, partition, name_hash))
        self.device_path = os.path.join(path, device)
        self.tmpdir = os.path.join(path, device, 'tmp')
        self.logger = logger
        self.metadata = {}
        self.data_file = None
        self.fp = None
        self.iter_etag = None
        self.started_at_0 = False
        self.read_to_eof = False
        self.quarantined_dir = None
        self.keep_cache = False
        if not os.path.exists(self.datadir):
            return
        files = sorted(os.listdir(self.datadir), reverse=True)
        meta_file = None
        for afile in files:
            if afile.endswith('.ts'):
                self.data_file = None
                with open(os.path.join(self.datadir, afile)) as mfp:
                    self.metadata = read_metadata(mfp)
                self.metadata['deleted'] = True
                break
            if afile.endswith('.meta') and not meta_file:
                meta_file = os.path.join(self.datadir, afile)
            if afile.endswith('.data') and not self.data_file:
                self.data_file = os.path.join(self.datadir, afile)
                break
        if not self.data_file:
            return
        self.fp = open(self.data_file, 'rb')
        self.metadata = read_metadata(self.fp)
        if not keep_data_fp:
            self.close(verify_file=False)
        if meta_file:
            with open(meta_file) as mfp:
                for key in self.metadata.keys():
                    if key.lower() not in DISALLOWED_HEADERS:
                        del self.metadata[key]
                self.metadata.update(read_metadata(mfp))

    def __iter__(self):
        """Returns an iterator over the data file."""
        try:
            dropped_cache = 0
            read = 0
            self.started_at_0 = False
            self.read_to_eof = False
            if self.fp.tell() == 0:
                self.started_at_0 = True
                self.iter_etag = md5()
            while True:
                chunk = self.fp.read(self.disk_chunk_size)
                if chunk:
                    if self.iter_etag:
                        self.iter_etag.update(chunk)
                    read += len(chunk)
                    if read - dropped_cache > (1024 * 1024):
                        self.drop_cache(self.fp.fileno(), dropped_cache,
                            read - dropped_cache)
                        dropped_cache = read
                    yield chunk
                else:
                    self.read_to_eof = True
                    self.drop_cache(self.fp.fileno(), dropped_cache,
                        read - dropped_cache)
                    break
        finally:
            self.close()

    def app_iter_range(self, start, stop):
        """Returns an iterator over the data file for range (start, stop)"""
        if start:
            self.fp.seek(start)
        if stop is not None:
            length = stop - start
        else:
            length = None
        for chunk in self:
            if length is not None:
                length -= len(chunk)
                if length < 0:
                    # Chop off the extra:
                    yield chunk[:length]
                    break
            yield chunk

    def _handle_close_quarantine(self):
        """Check if file needs to be quarantined"""
        try:
            obj_size = self.get_data_file_size()
        except DiskFileError, e:
            self.quarantine()
            return
        except DiskFileNotExist:
            return

        if (self.iter_etag and self.started_at_0 and self.read_to_eof and
            'ETag' in self.metadata and
            self.iter_etag.hexdigest() != self.metadata.get('ETag')):
                self.quarantine()

    def close(self, verify_file=True):
        """
        Close the file. Will handle quarantining file if necessary.

        :param verify_file: Defaults to True. If false, will not check
                            file to see if it needs quarantining.
        """
        if self.fp:
            try:
                if verify_file:
                    self._handle_close_quarantine()
            except (Exception, Timeout), e:
                import traceback
                self.logger.error(_('ERROR DiskFile %(data_file)s in '
                     '%(data_dir)s close failure: %(exc)s : %(stack)'),
                     {'exc': e, 'stack': ''.join(traceback.format_stack()),
                      'data_file': self.data_file, 'data_dir': self.datadir})
            finally:
                self.fp.close()
                self.fp = None

    def is_deleted(self):
        """
        Check if the file is deleted.

        :returns: True if the file doesn't exist or has been flagged as
                  deleted.
        """
        return not self.data_file or 'deleted' in self.metadata

    @contextmanager
    def mkstemp(self):
        """Contextmanager to make a temporary file."""
        if not os.path.exists(self.tmpdir):
            mkdirs(self.tmpdir)
        fd, tmppath = mkstemp(dir=self.tmpdir)
        try:
            yield fd, tmppath
        finally:
            try:
                os.close(fd)
            except OSError:
                pass
            try:
                os.unlink(tmppath)
            except OSError:
                pass

    def put(self, fd, tmppath, metadata, extension='.data'):
        """
        Finalize writing the file on disk, and renames it from the temp file to
        the real location.  This should be called after the data has been
        written to the temp file.

        :params fd: file descriptor of the temp file
        :param tmppath: path to the temporary file being used
        :param metadata: dictionary of metadata to be written
        :param extention: extension to be used when making the file
        """
        metadata['name'] = self.name
        timestamp = normalize_timestamp(metadata['X-Timestamp'])
        write_metadata(fd, metadata)
        if 'Content-Length' in metadata:
            self.drop_cache(fd, 0, int(metadata['Content-Length']))
        tpool.execute(os.fsync, fd)
        invalidate_hash(os.path.dirname(self.datadir))
        renamer(tmppath, os.path.join(self.datadir, timestamp + extension))
        self.metadata = metadata

    def unlinkold(self, timestamp):
        """
        Remove any older versions of the object file.  Any file that has an
        older timestamp than timestamp will be deleted.

        :param timestamp: timestamp to compare with each file
        """
        timestamp = normalize_timestamp(timestamp)
        for fname in os.listdir(self.datadir):
            if fname < timestamp:
                try:
                    os.unlink(os.path.join(self.datadir, fname))
                except OSError, err:    # pragma: no cover
                    if err.errno != errno.ENOENT:
                        raise

    def drop_cache(self, fd, offset, length):
        """Method for no-oping buffer cache drop method."""
        if not self.keep_cache:
            drop_buffer_cache(fd, offset, length)

    def quarantine(self):
        """
        In the case that a file is corrupted, move it to a quarantined
        area to allow replication to fix it.

        :returns: if quarantine is successful, path to quarantined
                  directory otherwise None
        """
        if not (self.is_deleted() or self.quarantined_dir):
            self.quarantined_dir = quarantine_renamer(self.device_path,
                                                      self.data_file)
            return self.quarantined_dir

    def get_data_file_size(self):
        """
        Returns the os.path.getsize for the file.  Raises an exception if this
        file does not match the Content-Length stored in the metadata. Or if
        self.data_file does not exist.

        :returns: file size as an int
        :raises DiskFileError: on file size mismatch.
        :raises DiskFileNotExist: on file not existing (including deleted)
        """
        try:
            file_size = 0
            if self.data_file:
                file_size = os.path.getsize(self.data_file)
                if 'Content-Length' in self.metadata:
                    metadata_size = int(self.metadata['Content-Length'])
                    if file_size != metadata_size:
                        raise DiskFileError('Content-Length of %s does not '
                          'match file size of %s' % (metadata_size, file_size))
                return file_size
        except OSError, err:
            if err.errno != errno.ENOENT:
                raise
        raise DiskFileNotExist('Data File does not exist.')


class ObjectController(object):
    """Implements the WSGI application for the Swift Object Server."""

    def __init__(self, conf):
        """
        Creates a new WSGI application for the Swift Object Server. An
        example configuration is given at
        <source-dir>/etc/object-server.conf-sample or
        /etc/swift/object-server.conf-sample.
        """
        self.logger = get_logger(conf, log_route='object-server')
        self.devices = conf.get('devices', '/srv/node/')
        self.mount_check = conf.get('mount_check', 'true').lower() in \
                              ('true', 't', '1', 'on', 'yes', 'y')
        self.node_timeout = int(conf.get('node_timeout', 3))
        self.conn_timeout = float(conf.get('conn_timeout', 0.5))
        self.disk_chunk_size = int(conf.get('disk_chunk_size', 65536))
        self.network_chunk_size = int(conf.get('network_chunk_size', 65536))
        self.log_requests = conf.get('log_requests', 't')[:1].lower() == 't'
        self.max_upload_time = int(conf.get('max_upload_time', 86400))
        self.slow = int(conf.get('slow', 0))
        self.bytes_per_sync = int(conf.get('mb_per_sync', 512)) * 1024 * 1024
        default_allowed_headers = '''
            content-disposition,
            content-encoding,
            x-delete-at,
            x-object-manifest,
        '''
        self.allowed_headers = set(i.strip().lower() for i in \
                conf.get('allowed_headers', \
                default_allowed_headers).split(',') if i.strip() and \
                i.strip().lower() not in DISALLOWED_HEADERS)
        self.expiring_objects_account = \
            (conf.get('auto_create_account_prefix') or '.') + \
            'expiring_objects'
        self.expiring_objects_container_divisor = \
            int(conf.get('expiring_objects_container_divisor') or 86400)

    def async_update(self, op, account, container, obj, host, partition,
                     contdevice, headers_out, objdevice):
        """
        Sends or saves an async update.

        :param op: operation performed (ex: 'PUT', or 'DELETE')
        :param account: account name for the object
        :param container: container name for the object
        :param obj: object name
        :param host: host that the container is on
        :param partition: partition that the container is on
        :param contdevice: device name that the container is on
        :param headers_out: dictionary of headers to send in the container
                            request
        :param objdevice: device name that the object is in
        """
        full_path = '/%s/%s/%s' % (account, container, obj)
        if all([host, partition, contdevice]):
            try:
                with ConnectionTimeout(self.conn_timeout):
                    ip, port = host.rsplit(':', 1)
                    conn = http_connect(ip, port, contdevice, partition, op,
                            full_path, headers_out)
                with Timeout(self.node_timeout):
                    response = conn.getresponse()
                    response.read()
                    if 200 <= response.status < 300:
                        return
                    else:
                        self.logger.error(_('ERROR Container update failed '
                            '(saving for async update later): %(status)d '
                            'response from %(ip)s:%(port)s/%(dev)s'),
                            {'status': response.status, 'ip': ip, 'port': port,
                             'dev': contdevice})
            except (Exception, Timeout):
                self.logger.exception(_('ERROR container update failed with '
                    '%(ip)s:%(port)s/%(dev)s (saving for async update later)'),
                    {'ip': ip, 'port': port, 'dev': contdevice})
        async_dir = os.path.join(self.devices, objdevice, ASYNCDIR)
        ohash = hash_path(account, container, obj)
        write_pickle(
            {'op': op, 'account': account, 'container': container,
                'obj': obj, 'headers': headers_out},
            os.path.join(async_dir, ohash[-3:], ohash + '-' +
                normalize_timestamp(headers_out['x-timestamp'])),
            os.path.join(self.devices, objdevice, 'tmp'))

    def container_update(self, op, account, container, obj, headers_in,
                         headers_out, objdevice):
        """
        Update the container when objects are updated.

        :param op: operation performed (ex: 'PUT', or 'DELETE')
        :param account: account name for the object
        :param container: container name for the object
        :param obj: object name
        :param headers_in: dictionary of headers from the original request
        :param headers_out: dictionary of headers to send in the container
                            request
        :param objdevice: device name that the object is in
        """
        host = headers_in.get('X-Container-Host', None)
        partition = headers_in.get('X-Container-Partition', None)
        contdevice = headers_in.get('X-Container-Device', None)
        if not all([host, partition, contdevice]):
            return
        self.async_update(op, account, container, obj, host, partition,
                          contdevice, headers_out, objdevice)

    def delete_at_update(self, op, delete_at, account, container, obj,
                         headers_in, objdevice):
        """
        Update the expiring objects container when objects are updated.

        :param op: operation performed (ex: 'PUT', or 'DELETE')
        :param account: account name for the object
        :param container: container name for the object
        :param obj: object name
        :param headers_in: dictionary of headers from the original request
        :param objdevice: device name that the object is in
        """
        host = partition = contdevice = None
        headers_out = {'x-timestamp': headers_in['x-timestamp'],
                       'x-trans-id': headers_in.get('x-trans-id', '-')}
        if op != 'DELETE':
            host = headers_in.get('X-Delete-At-Host', None)
            partition = headers_in.get('X-Delete-At-Partition', None)
            contdevice = headers_in.get('X-Delete-At-Device', None)
            headers_out['x-size'] = '0'
            headers_out['x-content-type'] = 'text/plain'
            headers_out['x-etag'] = 'd41d8cd98f00b204e9800998ecf8427e'
        self.async_update(op, self.expiring_objects_account,
            str(delete_at / self.expiring_objects_container_divisor *
                self.expiring_objects_container_divisor),
            '%s-%s/%s/%s' % (delete_at, account, container, obj),
            host, partition, contdevice, headers_out, objdevice)

    def POST(self, request):
        """Handle HTTP POST requests for the Swift Object Server."""
        try:
            device, partition, account, container, obj = \
                split_path(unquote(request.path), 5, 5, True)
        except ValueError, err:
            return HTTPBadRequest(body=str(err), request=request,
                        content_type='text/plain')
        if 'x-timestamp' not in request.headers or \
                    not check_float(request.headers['x-timestamp']):
            return HTTPBadRequest(body='Missing timestamp', request=request,
                        content_type='text/plain')
        new_delete_at = int(request.headers.get('X-Delete-At') or 0)
        if new_delete_at and new_delete_at < time.time():
            return HTTPBadRequest(body='X-Delete-At in past', request=request,
                                  content_type='text/plain')
        if self.mount_check and not check_mount(self.devices, device):
            return Response(status='507 %s is not mounted' % device)
        file = DiskFile(self.devices, device, partition, account, container,
                        obj, self.logger, disk_chunk_size=self.disk_chunk_size)

        if 'X-Delete-At' in file.metadata and \
                int(file.metadata['X-Delete-At']) <= time.time():
            return HTTPNotFound(request=request)
        if file.is_deleted():
            response_class = HTTPNotFound
        else:
            response_class = HTTPAccepted
        try:
            file_size = file.get_data_file_size()
        except (DiskFileError, DiskFileNotExist):
            file.quarantine()
            return HTTPNotFound(request=request)
        orig_timestamp = file.metadata.get('X-Timestamp', '0')
        if orig_timestamp >= request.headers['x-timestamp']:
            return HTTPConflict(request=request)
        metadata = {'X-Timestamp': request.headers['x-timestamp']}
        metadata.update(val for val in request.headers.iteritems()
                if val[0].lower().startswith('x-object-meta-'))
        for header_key in self.allowed_headers:
            if header_key in request.headers:
                header_caps = header_key.title()
                metadata[header_caps] = request.headers[header_key]
        old_delete_at = int(file.metadata.get('X-Delete-At') or 0)
        if old_delete_at != new_delete_at:
            if new_delete_at:
                self.delete_at_update('PUT', new_delete_at, account, container,
                                      obj, request.headers, device)
            if old_delete_at:
                self.delete_at_update('DELETE', old_delete_at, account,
                                      container, obj, request.headers, device)
        with file.mkstemp() as (fd, tmppath):
            file.put(fd, tmppath, metadata, extension='.meta')
        return response_class(request=request)

    def PUT(self, request):
        """Handle HTTP PUT requests for the Swift Object Server."""
        try:
            device, partition, account, container, obj = \
                split_path(unquote(request.path), 5, 5, True)
        except ValueError, err:
            return HTTPBadRequest(body=str(err), request=request,
                        content_type='text/plain')
        if self.mount_check and not check_mount(self.devices, device):
            return Response(status='507 %s is not mounted' % device)
        if 'x-timestamp' not in request.headers or \
                    not check_float(request.headers['x-timestamp']):
            return HTTPBadRequest(body='Missing timestamp', request=request,
                        content_type='text/plain')
        error_response = check_object_creation(request, obj)
        if error_response:
            return error_response
        new_delete_at = int(request.headers.get('X-Delete-At') or 0)
        if new_delete_at and new_delete_at < time.time():
            return HTTPBadRequest(body='X-Delete-At in past', request=request,
                                  content_type='text/plain')
        file = DiskFile(self.devices, device, partition, account, container,
                        obj, self.logger, disk_chunk_size=self.disk_chunk_size)
        orig_timestamp = file.metadata.get('X-Timestamp')
        if orig_timestamp and orig_timestamp >= request.headers['x-timestamp']:
            return HTTPConflict(request=request)
        upload_expiration = time.time() + self.max_upload_time
        etag = md5()
        upload_size = 0
        last_sync = 0
        with file.mkstemp() as (fd, tmppath):
            if 'content-length' in request.headers:
                fallocate(fd, int(request.headers['content-length']))
            reader = request.environ['wsgi.input'].read
            for chunk in iter(lambda: reader(self.network_chunk_size), ''):
                upload_size += len(chunk)
                if time.time() > upload_expiration:
                    return HTTPRequestTimeout(request=request)
                etag.update(chunk)
                while chunk:
                    written = os.write(fd, chunk)
                    chunk = chunk[written:]
                # For large files sync every 512MB (by default) written
                if upload_size - last_sync >= self.bytes_per_sync:
                    tpool.execute(os.fdatasync, fd)
                    drop_buffer_cache(fd, last_sync, upload_size - last_sync)
                    last_sync = upload_size

            if 'content-length' in request.headers and \
                    int(request.headers['content-length']) != upload_size:
                return Response(status='499 Client Disconnect')
            etag = etag.hexdigest()
            if 'etag' in request.headers and \
                            request.headers['etag'].lower() != etag:
                return HTTPUnprocessableEntity(request=request)
            metadata = {
                'X-Timestamp': request.headers['x-timestamp'],
                'Content-Type': request.headers['content-type'],
                'ETag': etag,
                'Content-Length': str(os.fstat(fd).st_size),
            }
            metadata.update(val for val in request.headers.iteritems()
                    if val[0].lower().startswith('x-object-meta-') and
                    len(val[0]) > 14)
            for header_key in self.allowed_headers:
                if header_key in request.headers:
                    header_caps = header_key.title()
                    metadata[header_caps] = request.headers[header_key]
            old_delete_at = int(file.metadata.get('X-Delete-At') or 0)
            if old_delete_at != new_delete_at:
                if new_delete_at:
                    self.delete_at_update('PUT', new_delete_at, account,
                        container, obj, request.headers, device)
                if old_delete_at:
                    self.delete_at_update('DELETE', old_delete_at, account,
                        container, obj, request.headers, device)
            file.put(fd, tmppath, metadata)
        file.unlinkold(metadata['X-Timestamp'])
        if not orig_timestamp or \
                orig_timestamp < request.headers['x-timestamp']:
            self.container_update('PUT', account, container, obj,
                request.headers,
                {'x-size': file.metadata['Content-Length'],
                 'x-content-type': file.metadata['Content-Type'],
                 'x-timestamp': file.metadata['X-Timestamp'],
                 'x-etag': file.metadata['ETag'],
                 'x-trans-id': request.headers.get('x-trans-id', '-')},
                device)
        resp = HTTPCreated(request=request, etag=etag)
        return resp

    def GET(self, request):
        """Handle HTTP GET requests for the Swift Object Server."""
        try:
            device, partition, account, container, obj = \
                split_path(unquote(request.path), 5, 5, True)
        except ValueError, err:
            return HTTPBadRequest(body=str(err), request=request,
                        content_type='text/plain')
        if self.mount_check and not check_mount(self.devices, device):
            return Response(status='507 %s is not mounted' % device)
        file = DiskFile(self.devices, device, partition, account, container,
                        obj, self.logger, keep_data_fp=True,
                        disk_chunk_size=self.disk_chunk_size)
        if file.is_deleted() or ('X-Delete-At' in file.metadata and
                int(file.metadata['X-Delete-At']) <= time.time()):
            if request.headers.get('if-match') == '*':
                return HTTPPreconditionFailed(request=request)
            else:
                return HTTPNotFound(request=request)
        try:
            file_size = file.get_data_file_size()
        except (DiskFileError, DiskFileNotExist):
            file.quarantine()
            return HTTPNotFound(request=request)
        if request.headers.get('if-match') not in (None, '*') and \
                file.metadata['ETag'] not in request.if_match:
            file.close()
            return HTTPPreconditionFailed(request=request)
        if request.headers.get('if-none-match') is not None:
            if file.metadata['ETag'] in request.if_none_match:
                resp = HTTPNotModified(request=request)
                resp.etag = file.metadata['ETag']
                file.close()
                return resp
        try:
            if_unmodified_since = request.if_unmodified_since
        except (OverflowError, ValueError):
            # catches timestamps before the epoch
            return HTTPPreconditionFailed(request=request)
        if if_unmodified_since and \
           datetime.fromtimestamp(float(file.metadata['X-Timestamp']), UTC) > \
           if_unmodified_since:
            file.close()
            return HTTPPreconditionFailed(request=request)
        try:
            if_modified_since = request.if_modified_since
        except (OverflowError, ValueError):
            # catches timestamps before the epoch
            return HTTPPreconditionFailed(request=request)
        if if_modified_since and \
           datetime.fromtimestamp(float(file.metadata['X-Timestamp']), UTC) < \
           if_modified_since:
            file.close()
            return HTTPNotModified(request=request)
        response = Response(app_iter=file,
                        request=request, conditional_response=True)
        response.headers['Content-Type'] = file.metadata.get('Content-Type',
                'application/octet-stream')
        for key, value in file.metadata.iteritems():
            if key.lower().startswith('x-object-meta-') or \
                    key.lower() in self.allowed_headers:
                response.headers[key] = value
        response.etag = file.metadata['ETag']
        response.last_modified = float(file.metadata['X-Timestamp'])
        response.content_length = file_size
        if response.content_length < KEEP_CACHE_SIZE and \
                'X-Auth-Token' not in request.headers and \
                'X-Storage-Token' not in request.headers:
            file.keep_cache = True
        if 'Content-Encoding' in file.metadata:
            response.content_encoding = file.metadata['Content-Encoding']
        response.headers['X-Timestamp'] = file.metadata['X-Timestamp']
        return request.get_response(response)

    def HEAD(self, request):
        """Handle HTTP HEAD requests for the Swift Object Server."""
        try:
            device, partition, account, container, obj = \
                split_path(unquote(request.path), 5, 5, True)
        except ValueError, err:
            resp = HTTPBadRequest(request=request)
            resp.content_type = 'text/plain'
            resp.body = str(err)
            return resp
        if self.mount_check and not check_mount(self.devices, device):
            return Response(status='507 %s is not mounted' % device)
        file = DiskFile(self.devices, device, partition, account, container,
                        obj, self.logger, disk_chunk_size=self.disk_chunk_size)
        if file.is_deleted() or ('X-Delete-At' in file.metadata and
                int(file.metadata['X-Delete-At']) <= time.time()):
            return HTTPNotFound(request=request)
        try:
            file_size = file.get_data_file_size()
        except (DiskFileError, DiskFileNotExist):
            file.quarantine()
            return HTTPNotFound(request=request)
        response = Response(request=request, conditional_response=True)
        response.headers['Content-Type'] = file.metadata.get('Content-Type',
                'application/octet-stream')
        for key, value in file.metadata.iteritems():
            if key.lower().startswith('x-object-meta-') or \
                    key.lower() in self.allowed_headers:
                response.headers[key] = value
        response.etag = file.metadata['ETag']
        response.last_modified = float(file.metadata['X-Timestamp'])
        # Needed for container sync feature
        response.headers['X-Timestamp'] = file.metadata['X-Timestamp']
        response.content_length = file_size
        if 'Content-Encoding' in file.metadata:
            response.content_encoding = file.metadata['Content-Encoding']
        response.headers['X-Timestamp'] = file.metadata['X-Timestamp']
        return response

    def DELETE(self, request):
        """Handle HTTP DELETE requests for the Swift Object Server."""
        try:
            device, partition, account, container, obj = \
                split_path(unquote(request.path), 5, 5, True)
        except ValueError, e:
            return HTTPBadRequest(body=str(e), request=request,
                        content_type='text/plain')
        if 'x-timestamp' not in request.headers or \
                    not check_float(request.headers['x-timestamp']):
            return HTTPBadRequest(body='Missing timestamp', request=request,
                        content_type='text/plain')
        if self.mount_check and not check_mount(self.devices, device):
            return Response(status='507 %s is not mounted' % device)
        file = DiskFile(self.devices, device, partition, account, container,
                        obj, self.logger, disk_chunk_size=self.disk_chunk_size)
        if 'x-if-delete-at' in request.headers and \
                int(request.headers['x-if-delete-at']) != \
                int(file.metadata.get('X-Delete-At') or 0):
            return HTTPPreconditionFailed(request=request,
                body='X-If-Delete-At and X-Delete-At do not match')
        old_delete_at = int(file.metadata.get('X-Delete-At') or 0)
        if old_delete_at:
            self.delete_at_update('DELETE', old_delete_at, account,
                                  container, obj, request.headers, device)
        orig_timestamp = file.metadata.get('X-Timestamp', 0)
        req_timestamp = request.headers['X-Timestamp']
        if file.is_deleted():
            response_class = HTTPNotFound
        else:
            if orig_timestamp < req_timestamp:
                response_class = HTTPNoContent
            else:
                response_class = HTTPConflict
        if orig_timestamp < req_timestamp:
            metadata = {'X-Timestamp': req_timestamp}
            with file.mkstemp() as (fd, tmppath):
                file.put(fd, tmppath, metadata, extension='.ts')
            file.unlinkold(req_timestamp)
            self.container_update('DELETE', account, container, obj,
                request.headers, {'x-timestamp': req_timestamp,
                'x-trans-id': request.headers.get('x-trans-id', '-')},
                device)
        resp = response_class(request=request)
        return resp

    def REPLICATE(self, request):
        """
        Handle REPLICATE requests for the Swift Object Server.  This is used
        by the object replicator to get hashes for directories.
        """
        try:
            device, partition, suffix = split_path(
                unquote(request.path), 2, 3, True)
        except ValueError, e:
            return HTTPBadRequest(body=str(e), request=request,
                                  content_type='text/plain')
        if self.mount_check and not check_mount(self.devices, device):
            return Response(status='507 %s is not mounted' % device)
        path = os.path.join(self.devices, device, DATADIR, partition)
        if not os.path.exists(path):
            mkdirs(path)
        suffixes = suffix.split('-') if suffix else []
        _junk, hashes = tpool.execute(tpooled_get_hashes, path,
                                      recalculate=suffixes)
        # See tpooled_get_hashes "Hack".
        if isinstance(hashes, BaseException):
            raise hashes
        return Response(body=pickle.dumps(hashes))

    def __call__(self, env, start_response):
        """WSGI Application entry point for the Swift Object Server."""
        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')
        else:
            try:
                if hasattr(self, req.method):
                    res = getattr(self, req.method)(req)
                else:
                    res = HTTPMethodNotAllowed()
            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())
        trans_time = time.time() - start_time
        if self.log_requests:
            log_line = '%s - - [%s] "%s %s" %s %s "%s" "%s" "%s" %.4f' % (
                req.remote_addr,
                time.strftime('%d/%b/%Y:%H:%M:%S +0000',
                              time.gmtime()),
                req.method, req.path, res.status.split()[0],
                res.content_length or '-', req.referer or '-',
                req.headers.get('x-trans-id', '-'),
                req.user_agent or '-',
                trans_time)
            if req.method == 'REPLICATE':
                self.logger.debug(log_line)
            else:
                self.logger.info(log_line)
        if req.method in ('PUT', 'DELETE'):
            slow = self.slow - trans_time
            if slow > 0:
                sleep(slow)
        return res(env, start_response)


def app_factory(global_conf, **local_conf):
    """paste.deploy app factory for creating WSGI object server apps"""
    conf = global_conf.copy()
    conf.update(local_conf)
    return ObjectController(conf)