This file is indexed.

/usr/lib/amanda/perl/Amanda/Xfer.pm is in amanda-common 1:3.3.1-4.

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
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
# This file was automatically generated by SWIG (http://www.swig.org).
# Version 2.0.4
#
# Do not make changes to this file unless you know what you are doing--modify
# the SWIG interface file instead.

package Amanda::Xfer;
use base qw(Exporter);
use base qw(DynaLoader);
require Amanda::MainLoop;
package Amanda::Xferc;
bootstrap Amanda::Xfer;
package Amanda::Xfer;
@EXPORT = qw();

# ---------- BASE METHODS -------------

package Amanda::Xfer;

sub TIEHASH {
    my ($classname,$obj) = @_;
    return bless $obj, $classname;
}

sub CLEAR { }

sub FIRSTKEY { }

sub NEXTKEY { }

sub FETCH {
    my ($self,$field) = @_;
    my $member_func = "swig_${field}_get";
    $self->$member_func();
}

sub STORE {
    my ($self,$field,$newval) = @_;
    my $member_func = "swig_${field}_set";
    $self->$member_func($newval);
}

sub this {
    my $ptr = shift;
    return tied(%$ptr);
}


# ------- FUNCTION WRAPPERS --------

package Amanda::Xfer;

*xfer_new = *Amanda::Xferc::xfer_new;
*xfer_unref = *Amanda::Xferc::xfer_unref;
*xfer_get_status = *Amanda::Xferc::xfer_get_status;
*xfer_repr = *Amanda::Xferc::xfer_repr;
*xfer_start = *Amanda::Xferc::xfer_start;
*xfer_cancel = *Amanda::Xferc::xfer_cancel;
*xfer_element_unref = *Amanda::Xferc::xfer_element_unref;
*xfer_element_repr = *Amanda::Xferc::xfer_element_repr;
*same_elements = *Amanda::Xferc::same_elements;
*xfer_source_random = *Amanda::Xferc::xfer_source_random;
*xfer_source_random_get_seed = *Amanda::Xferc::xfer_source_random_get_seed;
*xfer_source_pattern = *Amanda::Xferc::xfer_source_pattern;
*xfer_source_fd = *Amanda::Xferc::xfer_source_fd;
*xfer_source_directtcp_listen = *Amanda::Xferc::xfer_source_directtcp_listen;
*xfer_source_directtcp_listen_get_addrs = *Amanda::Xferc::xfer_source_directtcp_listen_get_addrs;
*xfer_source_directtcp_connect = *Amanda::Xferc::xfer_source_directtcp_connect;
*xfer_filter_xor = *Amanda::Xferc::xfer_filter_xor;
*xfer_filter_process = *Amanda::Xferc::xfer_filter_process;
*get_err_fd = *Amanda::Xferc::get_err_fd;
*xfer_dest_null = *Amanda::Xferc::xfer_dest_null;
*xfer_dest_buffer = *Amanda::Xferc::xfer_dest_buffer;
*xfer_dest_buffer_get = *Amanda::Xferc::xfer_dest_buffer_get;
*xfer_dest_fd = *Amanda::Xferc::xfer_dest_fd;
*xfer_dest_directtcp_listen = *Amanda::Xferc::xfer_dest_directtcp_listen;
*xfer_dest_directtcp_listen_get_addrs = *Amanda::Xferc::xfer_dest_directtcp_listen_get_addrs;
*xfer_dest_directtcp_connect = *Amanda::Xferc::xfer_dest_directtcp_connect;
*xfer_get_amglue_source = *Amanda::Xferc::xfer_get_amglue_source;

# ------- VARIABLE STUBS --------

package Amanda::Xfer;

*XFER_INIT = *Amanda::Xferc::XFER_INIT;
*XFER_START = *Amanda::Xferc::XFER_START;
*XFER_RUNNING = *Amanda::Xferc::XFER_RUNNING;
*XFER_DONE = *Amanda::Xferc::XFER_DONE;
*XMSG_INFO = *Amanda::Xferc::XMSG_INFO;
*XMSG_ERROR = *Amanda::Xferc::XMSG_ERROR;
*XMSG_DONE = *Amanda::Xferc::XMSG_DONE;
*XMSG_CANCEL = *Amanda::Xferc::XMSG_CANCEL;
*XMSG_PART_DONE = *Amanda::Xferc::XMSG_PART_DONE;
*XMSG_READY = *Amanda::Xferc::XMSG_READY;

@EXPORT_OK = ();
%EXPORT_TAGS = ();


=head1 NAME

Amanda::Xfer - the transfer architecture

=head1 SYNOPSIS

  use Amanda::MainLoop;
  use Amanda::Xfer qw( :constants );
  use POSIX;

  my $infd = POSIX::open("input", POSIX::O_RDONLY, 0);
  my $outfd = POSIX::open("output", POSIX::O_CREAT|POSIX::O_WRONLY, 0640);
  my $xfer = Amanda::Xfer->new([
    Amanda::Xfer::Source::Fd->new($infd),
    Amanda::Xfer::Dest::Fd->new($outfd)
  ]);
  $xfer->start(sub {
      my ($src, $xmsg, $xfer) = @_;
      print "Message from $xfer: $xmsg\n"; # use stringify operations
      if ($msg->{'type'} == $XMSG_DONE) {
	  Amanda::MainLoop::quit();
      }
  }, 0, 0);
  Amanda::MainLoop::run();

See L<http://wiki.zmanda.com/index.php/XFA> for background on the
transfer architecture.

=head1 Amanda::Xfer Objects

A new transfer is created with C<< Amanda::Xfer->new() >>, which takes
an arrayref giving the transfer elements which should compose the
transfer.

The resulting object has the following methods:

=over

=item start($cb, $offset, $size)

Start this transfer.  It transfer $size bytes starting from offset $offset.
$offset must be 0. $size is only supported by Amanda::Xfer::Source::Recovery.
A size of 0 transfer everything to EOF.
Processing takes place asynchronously, and messages will
begin queueing up immediately.  If C<$cb> is given, then it is installed as the
callback for messages from this transfer.  The callback receives three
arguments: the event source, the message, and a reference to the controlling
transfer.  See the description of C<Amanda::Xfer::Msg>, below, for details.

There is no need to remove the source on completion of the transfer - that is
handled for you.

=item cancel()

Stop transferring data.  The transfer will send an C<XMSG_CANCEL>,
"drain" any buffered data as best it can, and then complete normally
with an C<XMSG_DONE>.

=item get_status()

Get the transfer's status.  The result will be one of C<$XFER_INIT>,
C<$XFER_START>, C<$XFER_RUNNING>, or C<$XFER_DONE>.  These symbols are
available for import with the tag C<:constants>.

=item repr()

Return a string representation of this transfer, suitable for use in
debugging messages.  This method is automatically invoked when a
transfer is interpolated into a string:

  print "Starting $xfer\n";

=item get_source()

Get the L<Amanda::MainLoop> event source through which messages will
be delivered for this transfer.  Use its C<set_callback> method to
connect a perl sub for processing events. 

Use of this method is deprecated; instead, pass a callback to the C<start>
method.  If you set a callback via C<get_source>, then you I<must> C<remove>
the source when the transfer is complete!

=back

=head1 Amanda::Xfer::Element objects

The individual transfer elements that compose a transfer are instances
of subclasses of Amanda::Xfer::Element.  All such objects have a
C<repr()> method, similar to that for transfers, and support a similar
kind of string interpolation.

Note that the names of these classes contain the words "Source",
"Filter", and "Dest".  This is merely suggestive of their intended
purpose -- there are no such abstract classes.

=head2 Transfer Sources

=head3 Amanda::Xfer::Source::Device (SERVER ONLY)

  Amanda::Xfer::Source::Device->new($device);

This source reads data from a device.  The device should already be
queued up for reading (C<< $device->seek_file(..) >>).  The element
will read until the end of the device file.

=head3 Amanda::Xfer::Source::Fd

  Amanda::Xfer::Source::Fd->new(fileno($fh));

This source reads data from a file descriptor.  It reads until EOF,
but does not close the descriptor.  Be careful not to let Perl close
the file for you!

=head3 Amanda::Xfer::Source::Holding (SERVER-ONLY)

  Amanda::Xfer::Source::Holding->new($filename);

This source reads data from a holding file (see L<Amanda::Holding>).
If the transfer only consists of a C<Amanda::Xfer::Source::Holding>
and an C<Amanda::Xfer::Dest::Taper::Cacher> (with no filters), then the source
will call the destination's C<cache_inform> method so that it can use
holding chunks for a split-part cache.

=head3 Amanda::Xfer::Source::Random

  Amanda::Xfer::Source::Random->new($length, $seed);

This source provides I<length> bytes of random data (or an unlimited
amount of data if I<length> is zero).  C<$seed> is the seed used to
generate the random numbers; this seed can be used in a destination to
check for correct output.

If you need to string multiple transfers together into a coherent sequence of
random numbers, for example when testing the re-assembly of spanned dumps, call

  my $seed = $src->get_seed();

to get the finishing seed for the source, then pass this to the source
constructor for the next transfer.  When concatenated, the bytestreams from the
transfers will verify correctly using the original random seed.

=head3 Amanda::Xfer::Source::Pattern

  Amanda::Xfer::Source::Pattern->new($length, $pattern);

This source provides I<length> bytes containing copies of
I<pattern>. If I<length> is zero, the source provides an unlimited
number of bytes.

=head3 Amanda::Xfer::Source::Recovery (SERVER ONLY)

  Amanda::Xfer::Source::Recovery->new($first_device);

This source reads a datastream composed of on-device files.  Its constructor
takes a pointer to the first device that will be read from; this is used
internally to determine whether DirectTCP is supported.

The element sense C<$XMSG_READY> when it is ready for the first C<start_part>
invocation.  Don't do anything with the device between the start of the
transfer and when the element sends an C<$XMSG_READY>.

The element contains no logic to decide I<which> files to assemble into the
datastream; instead, it relies on the caller to supply pre-positioned devices:

  $src->start_part($device);

Once C<start_part> is called, the source will read until C<$device> produces an
EOF.  As each part is completed, the element sends an C<$XMSG_PART_DONE>
L<Amanda::Xfer::Msg>, with the following keys:

 size	    bytes read from the device
 duration   time spent reading
 fileno     the on-media file number from which the part was read

Call C<start_part> with C<$device = undef> to indicate that there are no more
parts.

To switch to a new device in mid-transfer, use C<use_device>:

  $dest->use_device($device);

This method must be called with a device that is not yet started, and thus must
be called before the C<start_part> method is called with a new device.

=head3 Amanda::Xfer::Source::DirectTCPListen

  Amanda::Xfer::Source::DirectTCPListen->new();

This source is for use when the transfer data will come in via DirectTCP, with
the data's I<source> connecting to the data's I<destination>.  That is, the
data source is the connection initiator.  Set up the transfer, and after
starting it, call this element's C<get_addrs> method to get an arrayref of ip/port pairs,
e.g., C<[ "192.168.4.5", 9924 ]>, all of which are listening for an incoming
data connection.  Once a connection arrives, this element will read data from
it and send those data into the transfer.

  my $addrs = $src->get_addrs();

=head3 Amanda::Xfer::Source::DirectTCPConnect

  Amanda::Xfer::Source::DirectTCPConnect->new($addrs);

This source is for use when the transfer data will come in via DirectTCP, with
the data's I<destination> connecting to the the data's I<source>.  That is, the
data destination is the connection initiator.  The element connects to
C<$addrs> and reads the transfer data from the connection.

=head2 Transfer Filters

=head3 Amanda::Xfer::Filter:Process

  $xfp = Amanda::Xfer::Filter::Process->new([@args], $need_root);

This filter will pipe data through the standard file descriptors of the
subprocess specified by C<@args>.  If C<$need_root> is true, it will attempt to
change to uid 0 before executing the process.  Note that the process is
invoked directly, not via a shell, so shell metacharcters (e.g., C<< 2>&1 >>)
will not function as expected. This method create a pipe for the process
stderr and the caller must read it or a hang may occur.

  $xfp->get_stderr_fd()

Return the file descriptor of the stderr pipe to read from.

=head3 Amanda::Xfer::Filter:Xor

  Amanda::Xfer::Filter::Xor->new($key);

This filter applies a bytewise XOR operation to the data flowing
through it.

=head2 Transfer Destinations

=head3 Amanda::Xfer::Dest::Device (SERVER ONLY)

  Amanda::Xfer::Dest::Device->new($device, $cancel_at_eom);

This source writes data to a device.  The device should be ready for writing
(C<< $device->start_file(..) >>).  On completion of the transfer, the file will
be finished.  If an error occurs, or if C<$cancel_at_eom> is true and the
device signals LEOM, the transfer will be cancelled.

Note that this element does not apply any sort of stream buffering.

=head3 Amanda::Xfer::Dest::Buffer

  Amanda::Xfer::Dest::Buffer->new($max_size);

This destination records data into an in-memory buffer which can grow up to
C<$max_size> bytes.  The buffer is available with the C<get> method, which
returns a copy of the buffer as a perl scalar:

    my $buf = $xdb->get();

=head3 Amanda::Xfer::Dest::DirectTCPListen

  Amanda::Xfer::Dest::DirectTCPListen->new();

This destination is for use when the transfer data will come in via DirectTCP,
with the data's I<destination> connecting to the data's I<source>.  That is,
the data destination is the connection initiator.  Set up the transfer, and
after starting it, call this element's C<get_addrs> method to get an arrayref
of ip/port pairs, e.g., C<[ "192.168.4.5", 9924 ]>, all of which are listening
for an incoming data connection.  Once a connection arrives, this element will
write the transfer data to it.

  my $addrs = $src->get_addrs();

=head3 Amanda::Xfer::Dest::DirectTCPConnect

  Amanda::Xfer::Dest::DirectTCPConnect->new($addrs);

This destination is for use when the transfer data will come in via DirectTCP,
with the data's I<source> connecting to the the data's I<destination>.  That
is, the data source is the connection initiator.  The element connects to
C<$addrs> and writes the transfer data to the connection.

=head3 Amanda::Xfer::Dest::Fd

  Amanda::Xfer::Dest::Fd->new(fileno($fh));

This destination writes data to a file descriptor.  The file is not
closed after the transfer is completed.  Be careful not to let Perl
close the file for you!

=head3 Amanda::Xfer::Dest::Null

  Amanda::Xfer::Dest::Null->new($seed);

This destination discards the data it receives.  If C<$seed> is
nonzero, then the element will validate that it receives the data that
C<Amanda::Xfer::Source::Random> produced with the same seed.  No
validation is performed if C<$seed> is zero.

=head3 Amanda::Xfer::Dest::Taper (SERVER ONLY)

This is the parent class to C<Amanda::Xfer::Dest::Taper::Cacher> and
C<Amanda::Xfer::Dest::Taper::DirectTCP>. These subclasses allow a single
transfer to write to multiple files (parts) on a device, and even spread those
parts over multiple devices, without interrupting the transfer itself.

The subclass constructors all take a C<$first_device>, which should be
configured but not yet started; and a C<$part_size> giving the maximum size of
each part.  Note that this value may be rounded up internally as necessary.

When a transfer using a taper destination element is first started, no data is
transfered until the element's C<start_part> method is called:

  $dest->start_part($retry_part);

where C<$device> is the device to which the part should be written.  The device
should have a file open and ready to write (that is, 
C<< $device->start_file(..) >> has already been called).  If C<$retry_part> is
true, then the previous, unsuccessful part will be retried.

As each part is completed, the element sends an C<$XMSG_PART_DONE>
C<Amanda::Xfer::Msg>, with the following keys:

 successful true if the part was written successfully
 eof	    recipient should not call start_part again
 eom        this volume is at EOM; a new volume is required
 size	    bytes written to volume
 duration   time spent writing, not counting changer ops, etc.
 partnum    the zero-based number of this part in the overall dumpfile
 fileno     the on-media file number used for this part, or 0 if no file
            was used

If C<eom> is true, then the caller should find a new volume before
continuing.  If C<eof> is not true, then C<start_part> should be called
again, with C<$retry_part = !successful>.  Note that it is possible
for some destinations to write a portion of a part successfully,
but still stop at EOM.  That is, C<eom> does not necessarily imply
C<!successful>.

To switch to a new device in mid-transfer, use C<use_device>:

  $dest->use_device($device);

This method must be called with a device that is not yet started.

If neither the memory nor disk caches are in use, but the dumpfile is
available on disk, then the C<cache_inform> method allows the element
to use that on-disk data to support retries.  This is intended to
support transfers from Amanda's holding disk (see
C<Amanda::Xfer::Source::Holding>), but may be useful for other
purposes.

  $dest->cache_inform($filename, $offset, $length);

This function indicates that C<$filename> contains C<$length> bytes of
data, beginning at offset C<$offset> from the beginning of the file.
These bytes are assumed to follow immediately after any bytes
previously specified to C<cache_inform>.  That is, no gaps or overlaps
are allowed in the data stream described to C<cache_inform>.
Furthermore, the location of each byte must be specified to this
method I<before> it is sent through the transfer.

  $dest->get_part_bytes_written();

This function returns the number of bytes written for the current part
to the device.

=head3 Amanda::Xfer::Dest::Taper::Splitter

  Amanda::Xfer::Dest::Taper::Splitter->new($first_device, $max_memory,
                        $part_size, $expect_cache_inform);

This class splits a data stream into parts on the storage media.  It is for use
when the device supports LEOM, when the dump is already available on disk
(C<cache_inform>), or when no caching is desired.  It does not cache parts, so
it can only retry a partial part if the transfer source is calling
C<cache_inform>.  If the element is used with devices that do not support LEOM,
then it will cancel the entire transfer if the device reaches EOM and
C<cache_inform> is not in use.  Set C<$expect_cache_inform> appropriately based
on the incoming data.

The C<$part_size> and C<$first_device> parameters are described above for
C<Amanda::Xfer::Dest::Taper>.

=head3 Amanda::Xfer::Dest::Taper::Cacher

  Amanda::Xfer::Dest::Taper::Cacher->new($first_device, $max_memory,
                        $part_size, $use_mem_cache, $disk_cache_dirname);

This class is similar to the splitter, but caches data from each part in one of
a variety of ways to support "rewinding" to retry a failed part (e.g., one that
does not fit on a device).  It assumes that when a device reaches EOM while
writing, the entire on-volume file is corrupt - that is, that the device does
not support logical EOM.  The class does not support C<cache_inform>.

The C<$part_size> and C<$first_device> parameters are described above for
C<Amanda::Xfer::Dest::Taper>.

If C<$use_mem_cache> is true, each part will be cached in memory (using
C<$part_size> bytes of memory; plan accordingly!).  If C<$disk_cache_dirname>
is defined, then each part will be cached on-disk in a file in this directory.
It is an error to specify both in-memory and on-disk caching.  If neither
option is specified, the element will operate successfully, but will not be
able to retry a part, and will cancel the transfer if a part fails.

=head3 Amanda::Xfer::Dest::Taper::DirectTCP

  Amanda::Xfer::Dest::Taper::DirectTCP->new($first_device, $part_size);

This class uses the Device API DirectTCP methods to write data to a device via
DirectTCP.  Since all DirectTCP devices support logical EOM, this class does
not cache any data, and will never re-start an unsuccessful part.

As state above, C<$first_device> must not be started when C<new> is called.
Furthermore, no use of that device is allowed until the element sens an
C<$XMSG_READY> to indicate that it is finished with the device.  The
C<start_part> method must not be called until this method is received either.

=head1 Amanda::Xfer::Msg objects

Messages are simple hashrefs, with a few convenience methods.  Like
transfers, they have a C<repr()> method that formats the message
nicely, and is available through string interpolation:

  print "Received message $msg\n";

The canonical description of the message types and keys is in
C<xfer-src/xmsg.h>, and is not duplicated here.  Every message has the
following basic keys.

=over

=item type

The message type -- one of the C<xmsg_type> constants available from
the import tag C<:constants>.

=item elt

The transfer element that sent the message.

=item version

The version of the message.  This is used to support extensibility of
the protocol.

=back

Additional keys are described in the documentation for the elements
that use them.  All keys are listed in C<xfer-src/xmsg.h>.

=cut



push @EXPORT_OK, qw(xfer_status_to_string);
push @{$EXPORT_TAGS{"xfer_status"}}, qw(xfer_status_to_string);

my %_xfer_status_VALUES;
#Convert an enum value to a single string
sub xfer_status_to_string {
    my ($enumval) = @_;

    for my $k (keys %_xfer_status_VALUES) {
	my $v = $_xfer_status_VALUES{$k};

	#is this a matching flag?
	if ($enumval == $v) {
	    return $k;
	}
    }

#default, just return the number
    return $enumval;
}

push @EXPORT_OK, qw($XFER_INIT);
push @{$EXPORT_TAGS{"xfer_status"}}, qw($XFER_INIT);

$_xfer_status_VALUES{"XFER_INIT"} = $XFER_INIT;

push @EXPORT_OK, qw($XFER_START);
push @{$EXPORT_TAGS{"xfer_status"}}, qw($XFER_START);

$_xfer_status_VALUES{"XFER_START"} = $XFER_START;

push @EXPORT_OK, qw($XFER_RUNNING);
push @{$EXPORT_TAGS{"xfer_status"}}, qw($XFER_RUNNING);

$_xfer_status_VALUES{"XFER_RUNNING"} = $XFER_RUNNING;

push @EXPORT_OK, qw($XFER_DONE);
push @{$EXPORT_TAGS{"xfer_status"}}, qw($XFER_DONE);

$_xfer_status_VALUES{"XFER_DONE"} = $XFER_DONE;

#copy symbols in xfer_status to constants
push @{$EXPORT_TAGS{"constants"}},  @{$EXPORT_TAGS{"xfer_status"}};

push @EXPORT_OK, qw(xmsg_type_to_string);
push @{$EXPORT_TAGS{"xmsg_type"}}, qw(xmsg_type_to_string);

my %_xmsg_type_VALUES;
#Convert an enum value to a single string
sub xmsg_type_to_string {
    my ($enumval) = @_;

    for my $k (keys %_xmsg_type_VALUES) {
	my $v = $_xmsg_type_VALUES{$k};

	#is this a matching flag?
	if ($enumval == $v) {
	    return $k;
	}
    }

#default, just return the number
    return $enumval;
}

push @EXPORT_OK, qw($XMSG_INFO);
push @{$EXPORT_TAGS{"xmsg_type"}}, qw($XMSG_INFO);

$_xmsg_type_VALUES{"XMSG_INFO"} = $XMSG_INFO;

push @EXPORT_OK, qw($XMSG_ERROR);
push @{$EXPORT_TAGS{"xmsg_type"}}, qw($XMSG_ERROR);

$_xmsg_type_VALUES{"XMSG_ERROR"} = $XMSG_ERROR;

push @EXPORT_OK, qw($XMSG_DONE);
push @{$EXPORT_TAGS{"xmsg_type"}}, qw($XMSG_DONE);

$_xmsg_type_VALUES{"XMSG_DONE"} = $XMSG_DONE;

push @EXPORT_OK, qw($XMSG_CANCEL);
push @{$EXPORT_TAGS{"xmsg_type"}}, qw($XMSG_CANCEL);

$_xmsg_type_VALUES{"XMSG_CANCEL"} = $XMSG_CANCEL;

push @EXPORT_OK, qw($XMSG_PART_DONE);
push @{$EXPORT_TAGS{"xmsg_type"}}, qw($XMSG_PART_DONE);

$_xmsg_type_VALUES{"XMSG_PART_DONE"} = $XMSG_PART_DONE;

push @EXPORT_OK, qw($XMSG_READY);
push @{$EXPORT_TAGS{"xmsg_type"}}, qw($XMSG_READY);

$_xmsg_type_VALUES{"XMSG_READY"} = $XMSG_READY;

#copy symbols in xmsg_type to constants
push @{$EXPORT_TAGS{"constants"}},  @{$EXPORT_TAGS{"xmsg_type"}};

sub xfer_start_with_callback {
    my ($xfer, $cb, $offset, $size) = @_;
    if (defined $cb) {
	my $releasing_cb = sub {
	    my ($src, $msg, $xfer) = @_;
	    my $done = $msg->{'type'} == $XMSG_DONE;
	    $src->remove() if $done;
	    $cb->(@_);
	    $cb = undef if $done; # break potential reference loop
	};
	$xfer->get_source()->set_callback($releasing_cb);
    }
    $offset = 0 if !defined $offset;
    $size = 0 if !defined $size;
    xfer_start($xfer, $offset, $size);
}

sub xfer_set_callback {
    my ($xfer, $cb) = @_;
    if (defined $cb) {
	my $releasing_cb = sub {
	    my ($src, $msg, $xfer) = @_;
	    my $done = $msg->{'type'} == $XMSG_DONE;
	    $src->remove() if $done;
	    $cb->(@_);
	    $cb = undef if $done; # break potential reference loop
       };
	$xfer->get_source()->set_callback($releasing_cb);
    } else {
	$xfer->get_source()->set_callback(undef);
    }
}

package Amanda::Xfer::Xfer;

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_new(@_);
}
*DESTROY = *Amanda::Xfer::xfer_unref;

use overload '""' => sub { $_[0]->repr(); };

use overload '==' => sub {     Amanda::Xfer::same_elements($_[0], $_[1]); };
use overload '!=' => sub { not Amanda::Xfer::same_elements($_[0], $_[1]); };
*repr = *Amanda::Xfer::xfer_repr;
*get_status = *Amanda::Xfer::xfer_get_status;
*get_source = *Amanda::Xfer::xfer_get_amglue_source;
*start = *Amanda::Xfer::xfer_start_with_callback;
*set_callback = *Amanda::Xfer::xfer_set_callback;
*cancel = *Amanda::Xfer::xfer_cancel;

package Amanda::Xfer::Element;
*DESTROY = *Amanda::Xfer::xfer_element_unref;

use overload '""' => sub { $_[0]->repr(); };

use overload '==' => sub {     Amanda::Xfer::same_elements($_[0], $_[1]); };
use overload '!=' => sub { not Amanda::Xfer::same_elements($_[0], $_[1]); };
*repr = *Amanda::Xfer::xfer_element_repr;

package Amanda::Xfer::Element::Glue;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

package Amanda::Xfer::Source::Fd;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_source_fd(@_);
}

package Amanda::Xfer::Source::Random;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_source_random(@_);
}
*get_seed = *Amanda::Xfer::xfer_source_random_get_seed;

package Amanda::Xfer::Source::DirectTCPListen;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_source_directtcp_listen(@_);
}
*get_addrs = *Amanda::Xfer::xfer_source_directtcp_listen_get_addrs;

package Amanda::Xfer::Source::DirectTCPConnect;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_source_directtcp_connect(@_);
}

package Amanda::Xfer::Source::Pattern;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_source_pattern(@_);
}

package Amanda::Xfer::Filter::Xor;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_filter_xor(@_);
}

package Amanda::Xfer::Filter::Process;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_filter_process(@_);
}
*get_stderr_fd = *Amanda::Xfer::get_err_fd;

package Amanda::Xfer::Dest::Fd;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_dest_fd(@_);
}

package Amanda::Xfer::Dest::Null;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_dest_null(@_);
}

package Amanda::Xfer::Dest::Buffer;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_dest_buffer(@_);
}
*get = *Amanda::Xfer::xfer_dest_buffer_get;

package Amanda::Xfer::Dest::DirectTCPListen;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_dest_directtcp_listen(@_);
}
*get_addrs = *Amanda::Xfer::xfer_dest_directtcp_listen_get_addrs;

package Amanda::Xfer::Dest::DirectTCPConnect;

use vars qw(@ISA);
@ISA = qw( Amanda::Xfer::Element );

sub new { 
    my $pkg = shift;


    Amanda::Xfer::xfer_dest_directtcp_connect(@_);
}

package Amanda::Xfer::Msg;

use Data::Dumper;
use overload '""' => sub { $_[0]->repr(); };

sub repr {
    my ($self) = @_;
    local $Data::Dumper::Indent = 0;
    local $Data::Dumper::Terse = 1;
    local $Data::Dumper::Useqq = 1;

    my $typestr = Amanda::Xfer::xmsg_type_to_string($self->{'type'});
    my $str = "{ type => \$$typestr, elt => $self->{'elt'}, version => $self->{'version'},";

    my %skip = ( "type" => 1, "elt" => 1, "version" => 1 );
    for my $k (keys %$self) {
	next if $skip{$k};
	$str .= " $k => " . Dumper($self->{$k}) . ",";
    }

    # strip the trailing comma and add a closing brace
    $str =~ s/,$/ }/g;

    return $str;
}

package Amanda::Xfer;

# make Amanda::Xfer->new equivalent to Amanda::Xfer::Xfer->new (don't
# worry, the blessings work out just fine)
*new = *Amanda::Xfer::Xfer::new;

# try to load Amanda::XferServer, which is server-only.  If it's not found, then
# its classes just remain undefined.
BEGIN {
    use Amanda::Util;
    if (Amanda::Util::built_with_component("server")) {
	eval "use Amanda::XferServer;";
    }
}
1;