This file is indexed.

/usr/share/doc/python3-postgresql/html/_modules/postgresql/copyman.html is in python3-postgresql 1.1.0-1build1.

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
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    
    <title>postgresql.copyman &mdash; py-postgresql 1.1.0 documentation</title>
    
    <link rel="stylesheet" href="../../_static/default.css" type="text/css" />
    <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
    
    <script type="text/javascript">
      var DOCUMENTATION_OPTIONS = {
        URL_ROOT:    '../../',
        VERSION:     '1.1.0',
        COLLAPSE_INDEX: false,
        FILE_SUFFIX: '.html',
        HAS_SOURCE:  true
      };
    </script>
    <script type="text/javascript" src="../../_static/jquery.js"></script>
    <script type="text/javascript" src="../../_static/underscore.js"></script>
    <script type="text/javascript" src="../../_static/doctools.js"></script>
    <link rel="top" title="py-postgresql 1.1.0 documentation" href="../../index.html" />
    <link rel="up" title="postgresql" href="../postgresql.html" />
 
<link rel="stylesheet" href="_static/unsuck.css" type="text/css" />

  </head>
  <body>
    <div class="related">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../../genindex.html" title="General Index"
             accesskey="I">index</a></li>
        <li class="right" >
          <a href="../../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li><a href="../../index.html">py-postgresql 1.1.0 documentation</a> &raquo;</li>
          <li><a href="../index.html" >Module code</a> &raquo;</li>
          <li><a href="../postgresql.html" accesskey="U">postgresql</a> &raquo;</li> 
      </ul>
    </div>  

    <div class="document">
      <div class="documentwrapper">
        <div class="bodywrapper">
          <div class="body">
            
  <h1>Source code for postgresql.copyman</h1><div class="highlight"><pre>
<span class="c">##</span>
<span class="c"># .copyman - COPY manager</span>
<span class="c">##</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">Manage complex COPY operations; one-to-many COPY streaming.</span>

<span class="sd">Primarily this module houses the `CopyManager` class, and the `transfer`</span>
<span class="sd">function for a high-level interface to using the `CopyManager`.</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">from</span> <span class="nn">abc</span> <span class="kn">import</span> <span class="n">abstractmethod</span><span class="p">,</span> <span class="n">abstractproperty</span>
<span class="kn">from</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="n">Iterator</span>
<span class="kn">from</span> <span class="nn">.python.element</span> <span class="kn">import</span> <span class="n">Element</span><span class="p">,</span> <span class="n">ElementSet</span>
<span class="kn">from</span> <span class="nn">.python.structlib</span> <span class="kn">import</span> <span class="n">ulong_unpack</span><span class="p">,</span> <span class="n">ulong_pack</span>
<span class="kn">from</span> <span class="nn">.protocol.buffer</span> <span class="kn">import</span> <span class="n">pq_message_stream</span>
<span class="kn">from</span> <span class="nn">.protocol.element3</span> <span class="kn">import</span> <span class="n">CopyData</span><span class="p">,</span> <span class="n">CopyDone</span><span class="p">,</span> <span class="n">Complete</span><span class="p">,</span> <span class="n">cat_messages</span>
<span class="kn">from</span> <span class="nn">.protocol.xact3</span> <span class="kn">import</span> <span class="n">Complete</span> <span class="k">as</span> <span class="n">xactComplete</span>

<span class="c">#: 10KB buffer for COPY messages by default.</span>
<span class="n">default_buffer_size</span> <span class="o">=</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">10</span>

<span class="k">class</span> <span class="nc">Fault</span><span class="p">(</span><span class="ne">Exception</span><span class="p">):</span>
	<span class="k">pass</span>

<div class="viewcode-block" id="ProducerFault"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.ProducerFault">[docs]</a><span class="k">class</span> <span class="nc">ProducerFault</span><span class="p">(</span><span class="n">Fault</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Exception raised when the Producer caused an exception.</span>

<span class="sd">	Normally, Producer faults are fatal.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">manager</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">manager</span> <span class="o">=</span> <span class="n">manager</span>

	<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="s">&quot;producer raised exception&quot;</span>
</div>
<div class="viewcode-block" id="ReceiverFault"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.ReceiverFault">[docs]</a><span class="k">class</span> <span class="nc">ReceiverFault</span><span class="p">(</span><span class="n">Fault</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Exception raised when Receivers cause an exception.</span>

<span class="sd">	Faults should be trapped if recovery from an exception is</span>
<span class="sd">	possible, or if the failed receiver is optional to the succes of the</span>
<span class="sd">	operation.</span>

<span class="sd">	The &#39;manager&#39; attribute is the CopyManager that raised the fault.</span>

<span class="sd">	The &#39;faults&#39; attribute is a dictionary mapping the receiver to the exception</span>
<span class="sd">	instance raised.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">manager</span><span class="p">,</span> <span class="n">faults</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">manager</span> <span class="o">=</span> <span class="n">manager</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">faults</span> <span class="o">=</span> <span class="n">faults</span>

	<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="s">&quot;{0} faults occurred&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">faults</span><span class="p">))</span>
</div>
<div class="viewcode-block" id="CopyFail"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.CopyFail">[docs]</a><span class="k">class</span> <span class="nc">CopyFail</span><span class="p">(</span><span class="ne">Exception</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Exception thrown by the CopyManager when the COPY operation failed.</span>

<span class="sd">	The &#39;manager&#39; attribute the CopyManager that raised the CopyFail.</span>

<span class="sd">	The &#39;reason&#39; attribute is a string indicating why it failed.</span>

<span class="sd">	The &#39;receiver_faults&#39; attribute is a mapping of receivers to exceptions that were</span>
<span class="sd">	raised on exit.</span>

<span class="sd">	The &#39;producer_fault&#39; attribute specifies if the producer raise an exception</span>
<span class="sd">	on exit.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">manager</span><span class="p">,</span> <span class="n">reason</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">receiver_faults</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
		<span class="n">producer_fault</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
	<span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">manager</span> <span class="o">=</span> <span class="n">manager</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">reason</span> <span class="o">=</span> <span class="n">reason</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">receiver_faults</span> <span class="o">=</span> <span class="n">receiver_faults</span> <span class="ow">or</span> <span class="p">{}</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">producer_fault</span> <span class="o">=</span> <span class="n">producer_fault</span>

	<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">reason</span> <span class="ow">or</span> <span class="s">&#39;copy aborted&#39;</span>

<span class="c"># The identifier for PQv3 copy data.</span></div>
<span class="n">PROTOCOL_PQv3</span> <span class="o">=</span> <span class="s">&quot;PQv3&quot;</span>
<span class="c"># The identifier for iterables of copy data sequences.</span>
<span class="c"># iter([[row1, row2], [row3, row4]])</span>
<span class="n">PROTOCOL_CHUNKS</span> <span class="o">=</span> <span class="s">&quot;CHUNKS&quot;</span>
<span class="c"># The protocol identifier for NULL producers and receivers.</span>
<span class="n">PROTOCOL_NULL</span> <span class="o">=</span> <span class="bp">None</span>

<span class="k">class</span> <span class="nc">ChunkProtocol</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
	<span class="n">__slots__</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;buffer&#39;</span><span class="p">,)</span>
	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">buffer</span> <span class="o">=</span> <span class="n">pq_message_stream</span><span class="p">()</span>

	<span class="k">def</span> <span class="nf">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">buffer</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="nb">bytes</span><span class="p">(</span><span class="n">data</span><span class="p">))</span>
		<span class="k">return</span> <span class="p">[</span><span class="n">x</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">buffer</span><span class="o">.</span><span class="n">read</span><span class="p">()]</span>

<span class="c"># Null protocol mapping.</span>
<span class="k">def</span> <span class="nf">EmptyView</span><span class="p">(</span><span class="n">arg</span><span class="p">):</span>
	<span class="k">return</span> <span class="n">memoryview</span><span class="p">(</span><span class="n">b</span><span class="s">&#39;&#39;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">EmptyList</span><span class="p">(</span><span class="n">arg</span><span class="p">):</span>
	<span class="k">return</span> <span class="p">[]</span>
<span class="k">def</span> <span class="nf">ReturnNone</span><span class="p">(</span><span class="n">arg</span><span class="p">):</span>
	<span class="k">return</span> <span class="bp">None</span>
<span class="c"># Zero-Transformation</span>
<span class="k">def</span> <span class="nf">NoTransformation</span><span class="p">(</span><span class="n">arg</span><span class="p">):</span>
	<span class="k">return</span> <span class="n">arg</span>

<span class="c"># Copy protocols being at the Python level; *not* wire/serialization format.</span>
<span class="n">copy_protocol_mappings</span> <span class="o">=</span> <span class="p">{</span>
	<span class="c"># PQv3 -&gt; Chunks</span>
	<span class="p">(</span><span class="n">PROTOCOL_PQv3</span><span class="p">,</span> <span class="n">PROTOCOL_CHUNKS</span><span class="p">)</span> <span class="p">:</span> <span class="n">ChunkProtocol</span><span class="p">,</span>
	<span class="c"># Chunks -&gt; PQv3</span>
	<span class="p">(</span><span class="n">PROTOCOL_CHUNKS</span><span class="p">,</span> <span class="n">PROTOCOL_PQv3</span><span class="p">)</span> <span class="p">:</span> <span class="k">lambda</span><span class="p">:</span> <span class="n">cat_messages</span><span class="p">,</span>
	<span class="c"># Null Producers and Receivers</span>
	<span class="p">(</span><span class="n">PROTOCOL_NULL</span><span class="p">,</span> <span class="n">PROTOCOL_PQv3</span><span class="p">)</span> <span class="p">:</span> <span class="k">lambda</span><span class="p">:</span> <span class="n">EmptyView</span><span class="p">,</span>
	<span class="p">(</span><span class="n">PROTOCOL_NULL</span><span class="p">,</span> <span class="n">PROTOCOL_CHUNKS</span><span class="p">)</span> <span class="p">:</span> <span class="k">lambda</span><span class="p">:</span> <span class="n">EmptyList</span><span class="p">,</span>
	<span class="p">(</span><span class="n">PROTOCOL_PQv3</span><span class="p">,</span> <span class="n">PROTOCOL_NULL</span><span class="p">)</span> <span class="p">:</span> <span class="k">lambda</span><span class="p">:</span> <span class="n">ReturnNone</span><span class="p">,</span>
	<span class="p">(</span><span class="n">PROTOCOL_CHUNKS</span><span class="p">,</span> <span class="n">PROTOCOL_NULL</span><span class="p">)</span> <span class="p">:</span> <span class="k">lambda</span><span class="p">:</span> <span class="n">ReturnNone</span><span class="p">,</span>
	<span class="c"># Zero Transformations</span>
	<span class="p">(</span><span class="n">PROTOCOL_NULL</span><span class="p">,</span> <span class="n">PROTOCOL_NULL</span><span class="p">)</span> <span class="p">:</span> <span class="k">lambda</span><span class="p">:</span> <span class="n">NoTransformation</span><span class="p">,</span>
	<span class="p">(</span><span class="n">PROTOCOL_CHUNKS</span><span class="p">,</span> <span class="n">PROTOCOL_CHUNKS</span><span class="p">)</span> <span class="p">:</span> <span class="k">lambda</span><span class="p">:</span> <span class="n">NoTransformation</span><span class="p">,</span>
	<span class="p">(</span><span class="n">PROTOCOL_PQv3</span><span class="p">,</span> <span class="n">PROTOCOL_PQv3</span><span class="p">)</span> <span class="p">:</span> <span class="k">lambda</span><span class="p">:</span> <span class="n">NoTransformation</span><span class="p">,</span>
<span class="p">}</span>

<span class="c"># Used to manage the conversions of COPY data.</span>
<span class="c"># Notably, chunks -&gt; PQv3 or PQv3 -&gt; chunks.</span>
<span class="k">class</span> <span class="nc">CopyTransformer</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
	<span class="n">__slots__</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;current&#39;</span><span class="p">,</span> <span class="s">&#39;transformers&#39;</span><span class="p">,</span> <span class="s">&#39;get&#39;</span><span class="p">)</span>
	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">source_protocol</span><span class="p">,</span> <span class="n">target_protocols</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">current</span> <span class="o">=</span> <span class="p">{}</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">transformers</span> <span class="o">=</span> <span class="p">{</span>
			<span class="n">x</span> <span class="p">:</span> <span class="n">copy_protocol_mappings</span><span class="p">[(</span><span class="n">source_protocol</span><span class="p">,</span> <span class="n">x</span><span class="p">)]()</span>
			<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">set</span><span class="p">(</span><span class="n">target_protocols</span><span class="p">)</span>
		<span class="p">}</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">get</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">current</span><span class="o">.</span><span class="n">__getitem__</span>

	<span class="k">def</span> <span class="nf">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
		<span class="k">for</span> <span class="n">protocol</span><span class="p">,</span> <span class="n">transformer</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">transformers</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">current</span><span class="p">[</span><span class="n">protocol</span><span class="p">]</span> <span class="o">=</span> <span class="n">transformer</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>

<span class="c">##</span>
<span class="c"># This is the object that does the magic.</span>
<span class="c"># It tracks the state of the wire.</span>
<span class="c"># It ends when non-COPY data is found.</span>
<div class="viewcode-block" id="WireState"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.WireState">[docs]</a><span class="k">class</span> <span class="nc">WireState</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Manages the state of the wire.</span>

<span class="sd">	This class manages three possible positions:</span>

<span class="sd">	 1. Between wire messages</span>
<span class="sd">	 2. Inside message header</span>
<span class="sd">	 3. Inside message (with complete header)</span>

<span class="sd">	The wire state will become unusable when the configured condition is True.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">__slots__</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;remaining_bytes&#39;</span><span class="p">,</span> <span class="s">&#39;size_fragment&#39;</span><span class="p">,</span> <span class="s">&#39;final_view&#39;</span><span class="p">,</span> <span class="s">&#39;condition&#39;</span><span class="p">,)</span>

<div class="viewcode-block" id="WireState.update"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.WireState.update">[docs]</a>	<span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">view</span><span class="p">,</span> <span class="n">getlen</span> <span class="o">=</span> <span class="n">ulong_unpack</span><span class="p">,</span> <span class="nb">len</span> <span class="o">=</span> <span class="nb">len</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Given the state of the COPY and new data, advance the position on the</span>
<span class="sd">		COPY stream.</span>
<span class="sd">		&quot;&quot;&quot;</span>
		<span class="c"># Only usable until the terminating condition.</span>
		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">final_view</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
			<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s">&quot;wire state encountered exceptional condition&quot;</span><span class="p">)</span>

		<span class="n">nmessages</span> <span class="o">=</span> <span class="mi">0</span>

		<span class="c"># State carried over from prior run.</span>
		<span class="n">remaining_bytes</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">remaining_bytes</span>
		<span class="n">size_fragment</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">size_fragment</span>

		<span class="c"># Terminating condition.</span>
		<span class="n">CONDITION</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">condition</span>

		<span class="c"># Is it a continuation of a message header?</span>
		<span class="k">if</span> <span class="n">remaining_bytes</span> <span class="o">==</span> <span class="o">-</span><span class="mi">1</span><span class="p">:</span>
			<span class="c">##</span>
			<span class="c"># Inside message header; after message type.</span>
			<span class="c"># Continue adding to the &#39;size_fragment&#39;</span>
			<span class="c"># until there are four bytes to unpack.</span>
			<span class="c">##</span>
			<span class="n">o</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">size_fragment</span><span class="p">)</span>
			<span class="n">size_fragment</span> <span class="o">+=</span> <span class="nb">bytes</span><span class="p">(</span><span class="n">view</span><span class="p">[:</span><span class="mi">4</span><span class="o">-</span><span class="n">o</span><span class="p">])</span>
			<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">size_fragment</span><span class="p">)</span> <span class="o">==</span> <span class="mi">4</span><span class="p">:</span>
				<span class="c"># The size fragment is completed; only part</span>
				<span class="c"># of the fragment remains to be consumed.</span>
				<span class="n">remaining_bytes</span> <span class="o">=</span> <span class="n">getlen</span><span class="p">(</span><span class="n">size_fragment</span><span class="p">)</span> <span class="o">-</span> <span class="n">o</span>
				<span class="n">size_fragment</span> <span class="o">=</span> <span class="n">b</span><span class="s">&#39;&#39;</span>
			<span class="k">else</span><span class="p">:</span>
				<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">size_fragment</span><span class="p">)</span> <span class="o">&lt;</span> <span class="mi">4</span>
				<span class="c"># size_fragment got updated..</span>

		<span class="k">if</span> <span class="n">remaining_bytes</span> <span class="o">&gt;=</span> <span class="mi">0</span><span class="p">:</span>
			<span class="n">vlen</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">view</span><span class="p">)</span>
			<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
				<span class="k">if</span> <span class="n">remaining_bytes</span><span class="p">:</span>
					<span class="c">##</span>
					<span class="c"># Inside message body. Message length has been unpacked.</span>
					<span class="c">##</span>
					<span class="n">view</span> <span class="o">=</span> <span class="n">view</span><span class="p">[</span><span class="n">remaining_bytes</span><span class="p">:]</span>
					<span class="c"># How much is remaining now?</span>
					<span class="n">rb</span> <span class="o">=</span> <span class="n">remaining_bytes</span> <span class="o">-</span> <span class="n">vlen</span>
					<span class="k">if</span> <span class="n">rb</span> <span class="o">&lt;=</span> <span class="mi">0</span><span class="p">:</span>
						<span class="c"># Finished it.</span>
						<span class="n">vlen</span> <span class="o">=</span> <span class="o">-</span><span class="n">rb</span>
						<span class="n">remaining_bytes</span> <span class="o">=</span> <span class="mi">0</span>
						<span class="n">nmessages</span> <span class="o">+=</span> <span class="mi">1</span>
					<span class="k">else</span><span class="p">:</span>
						<span class="n">vlen</span> <span class="o">=</span> <span class="mi">0</span>
						<span class="n">remaining_bytes</span> <span class="o">=</span> <span class="n">rb</span>
				<span class="c">##</span>
				<span class="c"># In between protocol messages.</span>
				<span class="c">##</span>
				<span class="k">if</span> <span class="ow">not</span> <span class="n">view</span><span class="p">:</span>
					<span class="c"># no more data to analyze</span>
					<span class="k">break</span>
				<span class="c"># There is at least one byte in the view.</span>
				<span class="k">if</span> <span class="n">CONDITION</span><span class="p">(</span><span class="n">view</span><span class="p">[</span><span class="mi">0</span><span class="p">]):</span>
					<span class="c"># State is dead now.</span>
					<span class="c"># User needs to handle unexpected message, then continue.</span>
					<span class="bp">self</span><span class="o">.</span><span class="n">final_view</span> <span class="o">=</span> <span class="n">view</span>
					<span class="k">assert</span> <span class="n">remaining_bytes</span> <span class="o">==</span> <span class="mi">0</span>
					<span class="k">break</span>
				<span class="k">if</span> <span class="n">vlen</span> <span class="o">&lt;</span> <span class="mi">5</span><span class="p">:</span>
					<span class="c"># Header continuation.</span>
					<span class="n">remaining_bytes</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
					<span class="n">view</span> <span class="o">=</span> <span class="n">view</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span>
					<span class="n">size_fragment</span> <span class="o">+=</span> <span class="nb">bytes</span><span class="p">(</span><span class="n">view</span><span class="p">)</span>
					<span class="c"># Not enough left for the header of the next message?</span>
					<span class="k">break</span>
				<span class="c"># Update remaining_bytes to include the header, and start over.</span>
				<span class="n">remaining_bytes</span> <span class="o">=</span> <span class="n">getlen</span><span class="p">(</span><span class="n">view</span><span class="p">[</span><span class="mi">1</span><span class="p">:</span><span class="mi">5</span><span class="p">])</span> <span class="o">+</span> <span class="mi">1</span>

		<span class="c"># Update the state for the next update.</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">remaining_bytes</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">size_fragment</span> <span class="o">=</span> <span class="p">(</span>
			<span class="n">remaining_bytes</span><span class="p">,</span> <span class="n">size_fragment</span><span class="p">,</span>
		<span class="p">)</span>
		<span class="c"># Emit the number of messages &quot;consumed&quot; this round.</span>
		<span class="k">return</span> <span class="n">nmessages</span>
</div>
	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">condition</span> <span class="o">=</span> <span class="p">(</span><span class="n">CopyData</span><span class="o">.</span><span class="n">type</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">__ne__</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">memoryview</span><span class="p">(</span><span class="n">b</span><span class="s">&#39;f&#39;</span><span class="p">)[</span><span class="mi">0</span><span class="p">],</span> <span class="nb">int</span><span class="p">)</span> <span class="k">else</span> <span class="n">CopyData</span><span class="o">.</span><span class="n">type</span><span class="o">.</span><span class="n">__ne__</span><span class="p">)):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">remaining_bytes</span> <span class="o">=</span> <span class="mi">0</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">size_fragment</span> <span class="o">=</span> <span class="n">b</span><span class="s">&#39;&#39;</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">final_view</span> <span class="o">=</span> <span class="bp">None</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">condition</span> <span class="o">=</span> <span class="n">condition</span>
</div>
<span class="k">class</span> <span class="nc">Fitting</span><span class="p">(</span><span class="n">Element</span><span class="p">):</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;FITTING&#39;</span>

	<span class="k">def</span> <span class="nf">_e_metas</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">yield</span> <span class="bp">None</span><span class="p">,</span> <span class="s">&#39;[&#39;</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">state</span> <span class="o">+</span> <span class="s">&#39;]&#39;</span>

	<span class="nd">@abstractproperty</span>
	<span class="k">def</span> <span class="nf">protocol</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		The COPY data format produced or consumed.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="c"># Used to setup the Receiver/Producer</span>
	<span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">pass</span>

	<span class="c"># Used to tear down the Receiver/Producer</span>
	<span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
		<span class="k">pass</span>

<span class="k">class</span> <span class="nc">Producer</span><span class="p">(</span><span class="n">Fitting</span><span class="p">,</span> <span class="n">Iterator</span><span class="p">):</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;PRODUCER&#39;</span>

	<span class="k">def</span> <span class="nf">_e_metas</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">_e_metas</span><span class="p">():</span>
			<span class="k">yield</span> <span class="n">x</span>
		<span class="k">yield</span> <span class="s">&#39;data&#39;</span><span class="p">,</span> <span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">total_bytes</span> <span class="o">/</span> <span class="p">(</span><span class="mi">1024</span><span class="o">**</span><span class="mi">2</span><span class="p">))</span> <span class="o">+</span> <span class="s">&#39;MB&#39;</span>
		<span class="k">yield</span> <span class="s">&#39;messages&#39;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">total_messages</span>
		<span class="k">yield</span> <span class="s">&#39;average size&#39;</span><span class="p">,</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">total_bytes</span> <span class="o">/</span> <span class="bp">self</span><span class="o">.</span><span class="n">total_messages</span><span class="p">)</span>

	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">total_messages</span> <span class="o">=</span> <span class="mi">0</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">total_bytes</span> <span class="o">=</span> <span class="mi">0</span>

	<span class="nd">@abstractmethod</span>
	<span class="k">def</span> <span class="nf">realign</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Method implemented by producers that emit COPY data that is not</span>
<span class="sd">		guaranteed to be aligned.</span>

<span class="sd">		This is only necessary in failure cases where receivers still need more</span>
<span class="sd">		data to complete the message.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abstractmethod</span>
	<span class="k">def</span> <span class="nf">__next__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Produce the next set of data.</span>
<span class="sd">		&quot;&quot;&quot;</span>

<span class="k">class</span> <span class="nc">Receiver</span><span class="p">(</span><span class="n">Fitting</span><span class="p">):</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;RECEIVER&#39;</span>

	<span class="nd">@abstractmethod</span>
	<span class="k">def</span> <span class="nf">transmit</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Finish the reception of the accepted data.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="nd">@abstractmethod</span>
	<span class="k">def</span> <span class="nf">accept</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Take the data object to be processed.</span>
<span class="sd">		&quot;&quot;&quot;</span>

<div class="viewcode-block" id="NullProducer"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.NullProducer">[docs]</a><span class="k">class</span> <span class="nc">NullProducer</span><span class="p">(</span><span class="n">Producer</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Produces no copy data.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">()</span>
	<span class="n">protocol</span> <span class="o">=</span> <span class="n">PROTOCOL_NULL</span>

	<span class="k">def</span> <span class="nf">realign</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="c"># Never needs to realigned.</span>
		<span class="k">pass</span>

	<span class="k">def</span> <span class="nf">__next__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">raise</span> <span class="ne">StopIteration</span>
</div>
<span class="k">class</span> <span class="nc">IteratorProducer</span><span class="p">(</span><span class="n">Producer</span><span class="p">):</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;iterator&#39;</span><span class="p">,)</span>
	<span class="n">protocol</span> <span class="o">=</span> <span class="n">PROTOCOL_CHUNKS</span>

	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">iterator</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">iterator</span> <span class="o">=</span> <span class="nb">iter</span><span class="p">(</span><span class="n">iterator</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">__next__</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">iterator</span><span class="o">.</span><span class="n">__next__</span>
		<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__init__</span><span class="p">()</span>

	<span class="k">def</span> <span class="nf">realign</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="c"># Never needs to realign; data is emitted on message boundaries.</span>
		<span class="k">pass</span>

	<span class="k">def</span> <span class="nf">__next__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">next</span> <span class="o">=</span> <span class="nb">next</span><span class="p">):</span>
		<span class="n">n</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">iterator</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">total_messages</span> <span class="o">+=</span> <span class="nb">len</span><span class="p">(</span><span class="n">n</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">total_bytes</span> <span class="o">+=</span> <span class="nb">sum</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="nb">len</span><span class="p">,</span> <span class="n">n</span><span class="p">))</span>
		<span class="k">return</span> <span class="n">n</span>

<div class="viewcode-block" id="ProtocolProducer"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.ProtocolProducer">[docs]</a><span class="k">class</span> <span class="nc">ProtocolProducer</span><span class="p">(</span><span class="n">Producer</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Producer using a PQv3 data stream.</span>

<span class="sd">	Normally, this class needs to be subclassed as it assumes that the given</span>
<span class="sd">	recv_into function will write COPY messages.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">protocol</span> <span class="o">=</span> <span class="n">PROTOCOL_PQv3</span>

	<span class="nd">@abstractmethod</span>
<div class="viewcode-block" id="ProtocolProducer.recover"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.ProtocolProducer.recover">[docs]</a>	<span class="k">def</span> <span class="nf">recover</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">view</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Given a view containing data read from the wire, recover the</span>
<span class="sd">		controller&#39;s state.</span>

<span class="sd">		This needs to be implemented by subclasses in order for the</span>
<span class="sd">		ProtocolReceiver to pass control back to the original state machine.</span>
<span class="sd">		&quot;&quot;&quot;</span>

	<span class="c">##</span>
	<span class="c"># When a COPY is interrupted, this can be used to accommodate</span>
	<span class="c"># the original state machine to identify the message boundaries.</span></div>
	<span class="k">def</span> <span class="nf">realign</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="n">s</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_state</span>

		<span class="k">if</span> <span class="n">s</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
			<span class="c"># It&#39;s already aligned.</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">nextchunk</span> <span class="o">=</span> <span class="nb">iter</span><span class="p">(())</span><span class="o">.</span><span class="n">__next__</span>
			<span class="k">return</span>

		<span class="k">if</span> <span class="n">s</span><span class="o">.</span><span class="n">final_view</span><span class="p">:</span>
			<span class="c"># It was at the end or non-COPY.</span>
			<span class="n">for_producer</span> <span class="o">=</span> <span class="nb">bytes</span><span class="p">(</span><span class="n">s</span><span class="o">.</span><span class="n">final_view</span><span class="p">)</span>
			<span class="n">for_receivers</span> <span class="o">=</span> <span class="n">b</span><span class="s">&#39;&#39;</span>
		<span class="k">elif</span> <span class="n">s</span><span class="o">.</span><span class="n">remaining_bytes</span> <span class="o">==</span> <span class="o">-</span><span class="mi">1</span><span class="p">:</span>
			<span class="c"># In the middle of a message header.</span>
			<span class="n">for_producer</span> <span class="o">=</span> <span class="n">CopyData</span><span class="o">.</span><span class="n">type</span> <span class="o">+</span> <span class="n">s</span><span class="o">.</span><span class="n">size_fragment</span>
			<span class="c"># receivers:</span>
			<span class="n">header</span> <span class="o">=</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_state</span><span class="o">.</span><span class="n">size_fragment</span><span class="o">.</span><span class="n">ljust</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">b</span><span class="s">&#39;</span><span class="se">\x00</span><span class="s">&#39;</span><span class="p">)</span> <span class="o">+</span> <span class="n">b</span><span class="s">&#39;</span><span class="se">\x04</span><span class="s">&#39;</span><span class="p">)</span>
			<span class="c"># Don&#39;t include the already sent parts.</span>
			<span class="n">buf</span> <span class="o">=</span> <span class="n">header</span><span class="p">[</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_state</span><span class="o">.</span><span class="n">size_fragment</span><span class="p">):]</span>
			<span class="n">bodylen</span> <span class="o">=</span> <span class="n">ulong_unpack</span><span class="p">(</span><span class="n">header</span><span class="p">)</span> <span class="o">-</span> <span class="mi">4</span>
			<span class="c"># This will often cause an invalid copy data error,</span>
			<span class="c"># but it doesn&#39;t matter much because we will issue a copy fail.</span>
			<span class="n">buf</span> <span class="o">+=</span> <span class="n">b</span><span class="s">&#39;</span><span class="se">\x00</span><span class="s">&#39;</span> <span class="o">*</span> <span class="n">bodylen</span>
			<span class="n">for_receivers</span> <span class="o">=</span> <span class="n">buf</span>
		<span class="k">elif</span> <span class="n">s</span><span class="o">.</span><span class="n">remaining_bytes</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">:</span>
			<span class="c"># In the middle of a message.</span>
			<span class="n">for_producer</span> <span class="o">=</span> <span class="n">CopyData</span><span class="o">.</span><span class="n">type</span> <span class="o">+</span> <span class="n">ulong_pack</span><span class="p">(</span><span class="n">s</span><span class="o">.</span><span class="n">remaining_bytes</span> <span class="o">+</span> <span class="mi">4</span><span class="p">)</span>
			<span class="n">for_receivers</span> <span class="o">=</span> <span class="n">b</span><span class="s">&#39;</span><span class="se">\x00</span><span class="s">&#39;</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">_state</span><span class="o">.</span><span class="n">remaining_bytes</span>
		<span class="k">else</span><span class="p">:</span>
			<span class="n">for_producer</span> <span class="o">=</span> <span class="n">for_receivers</span> <span class="o">=</span> <span class="n">b</span><span class="s">&#39;&#39;</span>

		<span class="bp">self</span><span class="o">.</span><span class="n">recover</span><span class="p">(</span><span class="n">for_producer</span><span class="p">)</span>
		<span class="k">if</span> <span class="n">for_receivers</span><span class="p">:</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">nextchunk</span> <span class="o">=</span> <span class="nb">iter</span><span class="p">((</span><span class="n">for_receivers</span><span class="p">,))</span><span class="o">.</span><span class="n">__next__</span>
		<span class="k">else</span><span class="p">:</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">nextchunk</span> <span class="o">=</span> <span class="nb">iter</span><span class="p">(())</span><span class="o">.</span><span class="n">__next__</span>

	<span class="k">def</span> <span class="nf">process_copy_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">view</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">total_messages</span> <span class="o">+=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_state</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">view</span><span class="p">)</span>
		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_state</span><span class="o">.</span><span class="n">final_view</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
			<span class="c"># It&#39;s not COPY data.</span>
			<span class="n">fv</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_state</span><span class="o">.</span><span class="n">final_view</span>
			<span class="c"># Only publish up to the final_view.</span>
			<span class="k">if</span> <span class="n">fv</span><span class="p">:</span>
				<span class="n">view</span> <span class="o">=</span> <span class="n">view</span><span class="p">[:</span><span class="o">-</span><span class="nb">len</span><span class="p">(</span><span class="n">fv</span><span class="p">)]</span>
			<span class="c"># The next next() will handle the async, error, or completion.</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">recover</span><span class="p">(</span><span class="n">fv</span><span class="p">)</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">_state</span> <span class="o">=</span> <span class="bp">None</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">total_bytes</span> <span class="o">+=</span> <span class="nb">len</span><span class="p">(</span><span class="n">view</span><span class="p">)</span>
		<span class="k">return</span> <span class="n">view</span>

	<span class="c"># Given a view, begin tracking the state of the wire.</span>
	<span class="k">def</span> <span class="nf">track_state</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">view</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_state</span> <span class="o">=</span> <span class="n">WireState</span><span class="p">()</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">nextchunk</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">recv_view</span>
		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">process_copy_data</span><span class="p">(</span><span class="n">view</span><span class="p">)</span>

	<span class="c"># The usual method for receiving more data.</span>
	<span class="k">def</span> <span class="nf">recv_view</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="n">view</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">buffer_view</span><span class="p">[:</span><span class="bp">self</span><span class="o">.</span><span class="n">recv_into</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">buffer</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">buffer_size</span><span class="p">)]</span>
		<span class="k">if</span> <span class="ow">not</span> <span class="n">view</span><span class="p">:</span>
			<span class="c"># Zero read; let the subclass handle the situation.</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">recover</span><span class="p">(</span><span class="n">memoryview</span><span class="p">(</span><span class="n">b</span><span class="s">&#39;&#39;</span><span class="p">))</span>
			<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">nextchunk</span><span class="p">()</span>
		<span class="n">view</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">process_copy_data</span><span class="p">(</span><span class="n">view</span><span class="p">)</span>
		<span class="k">return</span> <span class="n">view</span>

	<span class="k">def</span> <span class="nf">nextchunk</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s">&quot;producer not properly initialized&quot;</span><span class="p">)</span>

	<span class="k">def</span> <span class="nf">__next__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">nextchunk</span><span class="p">()</span>

	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
		<span class="n">recv_into</span> <span class="p">:</span> <span class="s">&quot;callable taking writable buffer and size&quot;</span><span class="p">,</span>
		<span class="n">buffer_size</span> <span class="o">=</span> <span class="n">default_buffer_size</span>
	<span class="p">):</span>
		<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__init__</span><span class="p">()</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">recv_into</span> <span class="o">=</span> <span class="n">recv_into</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">buffer_size</span> <span class="o">=</span> <span class="n">buffer_size</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">buffer</span> <span class="o">=</span> <span class="nb">bytearray</span><span class="p">(</span><span class="n">buffer_size</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">buffer_view</span> <span class="o">=</span> <span class="n">memoryview</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">buffer</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_state</span> <span class="o">=</span> <span class="bp">None</span>
</div>
<span class="k">class</span> <span class="nc">StatementProducer</span><span class="p">(</span><span class="n">ProtocolProducer</span><span class="p">):</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;statement&#39;</span><span class="p">,</span> <span class="s">&#39;parameters&#39;</span><span class="p">,)</span>

	<span class="k">def</span> <span class="nf">_e_metas</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">_e_metas</span><span class="p">():</span>
			<span class="k">yield</span> <span class="n">x</span>

	<span class="nd">@property</span>
	<span class="k">def</span> <span class="nf">state</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
			<span class="k">return</span> <span class="s">&#39;created&#39;</span>
		<span class="k">return</span> <span class="s">&#39;producing&#39;</span>

	<span class="k">def</span> <span class="nf">count</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span><span class="o">.</span><span class="n">count</span><span class="p">()</span>

	<span class="k">def</span> <span class="nf">command</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span><span class="o">.</span><span class="n">command</span><span class="p">()</span>

	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">statement</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">):</span>
		<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="n">statement</span><span class="o">.</span><span class="n">database</span><span class="o">.</span><span class="n">pq</span><span class="o">.</span><span class="n">socket</span><span class="o">.</span><span class="n">recv_into</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">statement</span> <span class="o">=</span> <span class="n">statement</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">parameters</span> <span class="o">=</span> <span class="n">args</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span> <span class="o">=</span> <span class="bp">None</span>

	<span class="c">##</span>
	<span class="c"># Take any data held by the statement&#39;s chunks and connection.</span>
	<span class="k">def</span> <span class="nf">confiscate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">next</span> <span class="o">=</span> <span class="nb">next</span><span class="p">):</span>
		<span class="n">current</span> <span class="o">=</span> <span class="p">[]</span>
		<span class="k">try</span><span class="p">:</span>
			<span class="k">while</span> <span class="ow">not</span> <span class="n">current</span><span class="p">:</span>
				<span class="n">current</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="nb">next</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span><span class="p">))</span>
		<span class="k">except</span> <span class="ne">StopIteration</span><span class="p">:</span>
			<span class="k">if</span> <span class="ow">not</span> <span class="n">current</span><span class="p">:</span>
				<span class="c"># End of COPY.</span>
				<span class="k">raise</span>
		<span class="n">pq</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span><span class="o">.</span><span class="n">database</span><span class="o">.</span><span class="n">pq</span>
		<span class="nb">buffer</span> <span class="o">=</span> <span class="n">cat_messages</span><span class="p">(</span><span class="n">current</span><span class="p">)</span> <span class="o">+</span> <span class="n">pq</span><span class="o">.</span><span class="n">message_buffer</span><span class="o">.</span><span class="n">getvalue</span><span class="p">()</span> <span class="o">+</span> <span class="p">(</span><span class="n">pq</span><span class="o">.</span><span class="n">read_data</span> <span class="ow">or</span> <span class="n">b</span><span class="s">&#39;&#39;</span><span class="p">)</span>
		<span class="n">view</span> <span class="o">=</span> <span class="n">memoryview</span><span class="p">(</span><span class="nb">buffer</span><span class="p">)</span>
		<span class="n">pq</span><span class="o">.</span><span class="n">read_data</span> <span class="o">=</span> <span class="bp">None</span>
		<span class="n">pq</span><span class="o">.</span><span class="n">message_buffer</span><span class="o">.</span><span class="n">truncate</span><span class="p">()</span>
		<span class="c"># Reconstruct the buffer from the already parsed lines.</span>
		<span class="n">r</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">track_state</span><span class="p">(</span><span class="n">view</span><span class="p">)</span>
		<span class="c"># XXX: Better way? Probably shouldn&#39;t do the full track_state if complete..</span>
		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span><span class="o">.</span><span class="n">_xact</span><span class="o">.</span><span class="n">state</span> <span class="ow">is</span> <span class="n">xactComplete</span><span class="p">:</span>
			<span class="c"># It&#39;s over, don&#39;t hand off to recv_view.</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">nextchunk</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">confiscate</span>
			<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">_state</span><span class="o">.</span><span class="n">final_view</span> <span class="ow">is</span> <span class="bp">None</span>
		<span class="k">return</span> <span class="n">r</span>

	<span class="k">def</span> <span class="nf">recover</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">view</span><span class="p">):</span>
		<span class="c"># Method used when non-COPY data is found.</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span><span class="o">.</span><span class="n">database</span><span class="o">.</span><span class="n">pq</span><span class="o">.</span><span class="n">message_buffer</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="nb">bytes</span><span class="p">(</span><span class="n">view</span><span class="p">))</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">nextchunk</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">confiscate</span>

	<span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__enter__</span><span class="p">()</span>
		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
			<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s">&quot;receiver already used&quot;</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">statement</span><span class="o">.</span><span class="n">chunks</span><span class="p">(</span><span class="o">*</span><span class="bp">self</span><span class="o">.</span><span class="n">parameters</span><span class="p">)</span>
		<span class="c"># Start by confiscating the connection state.</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">nextchunk</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">confiscate</span>

	<span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
		<span class="k">if</span> <span class="n">typ</span> <span class="ow">is</span> <span class="bp">None</span> <span class="ow">or</span> <span class="nb">issubclass</span><span class="p">(</span><span class="n">typ</span><span class="p">,</span> <span class="ne">Exception</span><span class="p">):</span>
			<span class="n">db</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">statement</span><span class="o">.</span><span class="n">database</span>
			<span class="k">if</span> <span class="ow">not</span> <span class="n">db</span><span class="o">.</span><span class="n">closed</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">_chunks</span><span class="o">.</span><span class="n">_xact</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
				<span class="c"># The COPY transaction is still happening,</span>
				<span class="c"># force an interrupt if the connection still exists.</span>
				<span class="n">db</span><span class="o">.</span><span class="n">interrupt</span><span class="p">()</span>
				<span class="k">if</span> <span class="n">db</span><span class="o">.</span><span class="n">pq</span><span class="o">.</span><span class="n">xact</span><span class="p">:</span>
					<span class="c"># Raise, CopyManager should trap.</span>
					<span class="n">db</span><span class="o">.</span><span class="n">_pq_complete</span><span class="p">()</span>
		<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__exit__</span><span class="p">(</span><span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">)</span>

<span class="k">class</span> <span class="nc">NullReceiver</span><span class="p">(</span><span class="n">Receiver</span><span class="p">):</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">()</span>
	<span class="n">protocol</span> <span class="o">=</span> <span class="n">PROTOCOL_NULL</span>
	<span class="n">state</span> <span class="o">=</span> <span class="s">&#39;null&#39;</span>

	<span class="k">def</span> <span class="nf">transmit</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="c"># Nothing to do.</span>
		<span class="k">pass</span>

	<span class="k">def</span> <span class="nf">accept</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
		<span class="k">pass</span>

<span class="k">class</span> <span class="nc">ProtocolReceiver</span><span class="p">(</span><span class="n">Receiver</span><span class="p">):</span>
	<span class="n">protocol</span> <span class="o">=</span> <span class="n">PROTOCOL_PQv3</span>
	<span class="n">__slots__</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;send&#39;</span><span class="p">,</span> <span class="s">&#39;view&#39;</span><span class="p">)</span>

	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">send</span><span class="p">):</span>
		<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__init__</span><span class="p">()</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">send</span> <span class="o">=</span> <span class="n">send</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">view</span> <span class="o">=</span> <span class="n">memoryview</span><span class="p">(</span><span class="n">b</span><span class="s">&#39;&#39;</span><span class="p">)</span>

	<span class="k">def</span> <span class="nf">accept</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">view</span> <span class="o">=</span> <span class="n">data</span>

	<span class="k">def</span> <span class="nf">transmit</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">while</span> <span class="bp">self</span><span class="o">.</span><span class="n">view</span><span class="p">:</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">view</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">view</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">send</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">view</span><span class="p">):]</span>

	<span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="bp">self</span>

	<span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
		<span class="k">pass</span>

<span class="k">class</span> <span class="nc">StatementReceiver</span><span class="p">(</span><span class="n">ProtocolReceiver</span><span class="p">):</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;statement&#39;</span><span class="p">,</span> <span class="s">&#39;parameters&#39;</span><span class="p">,)</span>
	<span class="n">__slots__</span> <span class="o">=</span> <span class="n">ProtocolReceiver</span><span class="o">.</span><span class="n">__slots__</span> <span class="o">+</span> <span class="n">_e_factors</span> <span class="o">+</span> <span class="p">(</span><span class="s">&#39;xact&#39;</span><span class="p">,)</span>

	<span class="k">def</span> <span class="nf">_e_metas</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">yield</span> <span class="bp">None</span><span class="p">,</span> <span class="s">&#39;[&#39;</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">state</span> <span class="o">+</span> <span class="s">&#39;]&#39;</span>

	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">statement</span><span class="p">,</span> <span class="o">*</span><span class="n">parameters</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">statement</span> <span class="o">=</span> <span class="n">statement</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">parameters</span> <span class="o">=</span> <span class="n">parameters</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">xact</span> <span class="o">=</span> <span class="bp">None</span>
		<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="n">statement</span><span class="o">.</span><span class="n">database</span><span class="o">.</span><span class="n">pq</span><span class="o">.</span><span class="n">socket</span><span class="o">.</span><span class="n">send</span><span class="p">,)</span>

	<span class="c"># XXX: A bit of a hack...</span>
	<span class="c"># This is actually a good indication that statements need a .copy()</span>
	<span class="c"># execution method for producing a &quot;CopyCursor&quot; that reads or writes.</span>
	<span class="k">class</span> <span class="nc">WireReady</span><span class="p">(</span><span class="ne">BaseException</span><span class="p">):</span>
		<span class="k">pass</span>
	<span class="k">def</span> <span class="nf">raise_wire_ready</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">raise</span> <span class="bp">self</span><span class="o">.</span><span class="n">WireReady</span><span class="p">()</span>
		<span class="k">yield</span> <span class="bp">None</span>

	<span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">iter</span> <span class="o">=</span> <span class="nb">iter</span><span class="p">):</span>
		<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__enter__</span><span class="p">()</span>
		<span class="c"># Get the connection in the COPY state.</span>
		<span class="k">try</span><span class="p">:</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">statement</span><span class="o">.</span><span class="n">load_chunks</span><span class="p">(</span>
				<span class="nb">iter</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">raise_wire_ready</span><span class="p">()),</span> <span class="o">*</span><span class="bp">self</span><span class="o">.</span><span class="n">parameters</span>
			<span class="p">)</span>
		<span class="k">except</span> <span class="bp">self</span><span class="o">.</span><span class="n">WireReady</span><span class="p">:</span>
			<span class="c"># It&#39;s a BaseException; nothing should trap it.</span>
			<span class="c"># Note the transaction object; we&#39;ll use it on exit.</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">xact</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">statement</span><span class="o">.</span><span class="n">database</span><span class="o">.</span><span class="n">pq</span><span class="o">.</span><span class="n">xact</span>

	<span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">xact</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
			<span class="c"># Nothing to do.</span>
			<span class="k">return</span> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__exit__</span><span class="p">(</span><span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">)</span>

		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">view</span><span class="p">:</span>
			<span class="c"># The realigned producer emitted the necessary</span>
			<span class="c"># data for message boundary alignment.</span>
			<span class="c">#</span>
			<span class="c"># In this case, we unconditionally fail.</span>
			<span class="n">pq</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">statement</span><span class="o">.</span><span class="n">database</span><span class="o">.</span><span class="n">pq</span>
			<span class="c"># There shouldn&#39;t be any message_data, atm.</span>
			<span class="n">pq</span><span class="o">.</span><span class="n">message_data</span> <span class="o">=</span> <span class="nb">bytes</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">view</span><span class="p">)</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">statement</span><span class="o">.</span><span class="n">database</span><span class="o">.</span><span class="n">_pq_complete</span><span class="p">()</span>
			<span class="c"># It is possible for a non-alignment view to exist in cases of</span>
			<span class="c"># faults. However, exit should *not* be called in those cases.</span>
			<span class="c">##</span>
		<span class="k">elif</span> <span class="n">typ</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
			<span class="c"># Success?</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">xact</span><span class="o">.</span><span class="n">messages</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">xact</span><span class="o">.</span><span class="n">CopyDoneSequence</span>
			<span class="c"># If not, this will blow up.</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">statement</span><span class="o">.</span><span class="n">database</span><span class="o">.</span><span class="n">_pq_complete</span><span class="p">()</span>
			<span class="c"># Find the complete message for command and count.</span>
			<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">xact</span><span class="o">.</span><span class="n">messages_received</span><span class="p">():</span>
				<span class="k">if</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="s">&#39;type&#39;</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span> <span class="o">==</span> <span class="n">Complete</span><span class="o">.</span><span class="n">type</span><span class="p">:</span>
					<span class="bp">self</span><span class="o">.</span><span class="n">_complete_message</span> <span class="o">=</span> <span class="n">x</span>
		<span class="k">elif</span> <span class="nb">issubclass</span><span class="p">(</span><span class="n">typ</span><span class="p">,</span> <span class="ne">Exception</span><span class="p">):</span>
			<span class="c"># Likely raises. CopyManager should trap.</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">statement</span><span class="o">.</span><span class="n">database</span><span class="o">.</span><span class="n">_pq_complete</span><span class="p">()</span>

		<span class="k">return</span> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__exit__</span><span class="p">(</span><span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">)</span>

	<span class="k">def</span> <span class="nf">count</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_complete_message</span><span class="o">.</span><span class="n">extract_count</span><span class="p">()</span>

	<span class="k">def</span> <span class="nf">command</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_complete_message</span><span class="o">.</span><span class="n">extract_command</span><span class="p">()</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s">&#39;ascii&#39;</span><span class="p">)</span>

<div class="viewcode-block" id="CallReceiver"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.CallReceiver">[docs]</a><span class="k">class</span> <span class="nc">CallReceiver</span><span class="p">(</span><span class="n">Receiver</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Call the given object with a list of COPY lines.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;callable&#39;</span><span class="p">,)</span>
	<span class="n">protocol</span> <span class="o">=</span> <span class="n">PROTOCOL_CHUNKS</span>

	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">callable</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">callable</span> <span class="o">=</span> <span class="nb">callable</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">lines</span> <span class="o">=</span> <span class="bp">None</span>
		<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">__init__</span><span class="p">()</span>

	<span class="k">def</span> <span class="nf">transmit</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">lines</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">callable</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">lines</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">lines</span> <span class="o">=</span> <span class="bp">None</span>

	<span class="k">def</span> <span class="nf">accept</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">lines</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">lines</span> <span class="o">=</span> <span class="n">lines</span>
</div>
<div class="viewcode-block" id="CopyManager"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.CopyManager">[docs]</a><span class="k">class</span> <span class="nc">CopyManager</span><span class="p">(</span><span class="n">Element</span><span class="p">,</span> <span class="n">Iterator</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	A class for managing COPY operations.</span>

<span class="sd">	Connects the producer to the receivers.</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">_e_label</span> <span class="o">=</span> <span class="s">&#39;COPY&#39;</span>
	<span class="n">_e_factors</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;producer&#39;</span><span class="p">,</span> <span class="s">&#39;receivers&#39;</span><span class="p">,)</span>

	<span class="k">def</span> <span class="nf">_e_metas</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">yield</span> <span class="bp">None</span><span class="p">,</span> <span class="s">&#39;[&#39;</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">state</span> <span class="o">+</span> <span class="s">&#39;]&#39;</span>

	<span class="nd">@property</span>
	<span class="k">def</span> <span class="nf">state</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">transformer</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
			<span class="k">return</span> <span class="s">&#39;initialized&#39;</span>
		<span class="k">return</span> <span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">total_messages</span><span class="p">)</span> <span class="o">+</span> <span class="s">&#39; messages transferred&#39;</span>

	<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">producer</span><span class="p">,</span> <span class="o">*</span><span class="n">receivers</span><span class="p">):</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">producer</span> <span class="o">=</span> <span class="n">producer</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">transformer</span> <span class="o">=</span> <span class="bp">None</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">receivers</span> <span class="o">=</span> <span class="n">ElementSet</span><span class="p">(</span><span class="n">receivers</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_seen_stop_iteration</span> <span class="o">=</span> <span class="bp">False</span>
		<span class="n">rp</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
		<span class="n">add</span> <span class="o">=</span> <span class="n">rp</span><span class="o">.</span><span class="n">add</span>
		<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">receivers</span><span class="p">:</span>
			<span class="n">add</span><span class="p">(</span><span class="n">x</span><span class="o">.</span><span class="n">protocol</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">protocols</span> <span class="o">=</span> <span class="n">rp</span>

	<span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">transformer</span><span class="p">:</span>
			<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s">&quot;copy already started&quot;</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_stats</span> <span class="o">=</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">transformer</span> <span class="o">=</span> <span class="n">CopyTransformer</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">protocol</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">protocols</span><span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">__enter__</span><span class="p">()</span>
		<span class="k">try</span><span class="p">:</span>
			<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">receivers</span><span class="p">:</span>
				<span class="n">x</span><span class="o">.</span><span class="n">__enter__</span><span class="p">()</span>
		<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">__exit__</span><span class="p">(</span><span class="o">*</span><span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">())</span>
		<span class="k">return</span> <span class="bp">self</span>

	<span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
		<span class="c">##</span>
		<span class="c"># Exiting the CopyManager is a fairly complex operation.</span>
		<span class="c">#</span>
		<span class="c"># In cases of failure, re-alignment may need to happen</span>
		<span class="c"># for when the receivers are not on a message boundary.</span>
		<span class="c">##</span>
		<span class="k">if</span> <span class="n">typ</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">issubclass</span><span class="p">(</span><span class="n">typ</span><span class="p">,</span> <span class="ne">Exception</span><span class="p">):</span>
			<span class="c"># Don&#39;t bother, it&#39;s an interrupt or sufficient resources.</span>
			<span class="k">return</span>

		<span class="n">profail</span> <span class="o">=</span> <span class="bp">None</span>
		<span class="k">try</span><span class="p">:</span>
			<span class="c"># Does nothing if the COPY was successful.</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">realign</span><span class="p">()</span>
			<span class="k">try</span><span class="p">:</span>
				<span class="c">##</span>
				<span class="c"># If the producer is not aligned to a message boundary,</span>
				<span class="c"># it can emit completion data that will put the receivers</span>
				<span class="c"># back on track.</span>
				<span class="c"># This last service call will move that data onto the receivers.</span>
				<span class="bp">self</span><span class="o">.</span><span class="n">_service_producer</span><span class="p">()</span>
				<span class="c">##</span>
				<span class="c"># The receivers need to handle any new data in their __exit__.</span>
			<span class="k">except</span> <span class="ne">StopIteration</span><span class="p">:</span>
				<span class="c"># No re-alignment needed.</span>
				<span class="k">pass</span>

			<span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">__exit__</span><span class="p">(</span><span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">)</span>
		<span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">x</span><span class="p">:</span>
			<span class="c"># reference profail later.</span>
			<span class="n">profail</span> <span class="o">=</span> <span class="n">x</span>

		<span class="c"># No receivers? It wasn&#39;t a success.</span>
		<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">receivers</span><span class="p">:</span>
			<span class="k">raise</span> <span class="n">CopyFail</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s">&quot;no receivers&quot;</span><span class="p">,</span> <span class="n">producer_fault</span> <span class="o">=</span> <span class="n">profail</span><span class="p">)</span>

		<span class="n">exit_faults</span> <span class="o">=</span> <span class="p">{}</span>
		<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">receivers</span><span class="p">:</span>
			<span class="k">try</span><span class="p">:</span>
				<span class="n">x</span><span class="o">.</span><span class="n">__exit__</span><span class="p">(</span><span class="n">typ</span><span class="p">,</span> <span class="n">val</span><span class="p">,</span> <span class="n">tb</span><span class="p">)</span>
			<span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
				<span class="n">exit_faults</span><span class="p">[</span><span class="n">x</span><span class="p">]</span> <span class="o">=</span> <span class="n">e</span>

		<span class="k">if</span> <span class="n">typ</span> <span class="ow">or</span> <span class="n">exit_faults</span> <span class="ow">or</span> <span class="n">profail</span> <span class="ow">or</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_seen_stop_iteration</span><span class="p">:</span>
			<span class="k">raise</span> <span class="n">CopyFail</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
				<span class="s">&quot;could not complete the COPY operation&quot;</span><span class="p">,</span>
				<span class="n">receiver_faults</span> <span class="o">=</span> <span class="n">exit_faults</span> <span class="ow">or</span> <span class="bp">None</span><span class="p">,</span>
				<span class="n">producer_fault</span> <span class="o">=</span> <span class="n">profail</span>
			<span class="p">)</span>

<div class="viewcode-block" id="CopyManager.reconcile"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.CopyManager.reconcile">[docs]</a>	<span class="k">def</span> <span class="nf">reconcile</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">r</span><span class="p">):</span>
		<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">		Reconcile a receiver that faulted.</span>

<span class="sd">		This method should be used to add back a receiver that failed to</span>
<span class="sd">		complete its write operation, but is capable of completing the</span>
<span class="sd">		operation at this time.</span>
<span class="sd">		&quot;&quot;&quot;</span>
		<span class="k">if</span> <span class="n">r</span><span class="o">.</span><span class="n">protocol</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">protocols</span><span class="p">:</span>
			<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s">&quot;cannot add new receivers to copy operations&quot;</span><span class="p">)</span>
		<span class="n">r</span><span class="o">.</span><span class="n">transmit</span><span class="p">()</span>
		<span class="c"># Okay, add it back.</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">receivers</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">r</span><span class="p">)</span>
</div>
	<span class="k">def</span> <span class="nf">_service_producer</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="c"># Setup current data.</span>
		<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">receivers</span><span class="p">:</span>
			<span class="c"># No receivers to take the data.</span>
			<span class="k">raise</span> <span class="ne">StopIteration</span>

		<span class="k">try</span><span class="p">:</span>
			<span class="n">nextdata</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="p">)</span>
		<span class="k">except</span> <span class="ne">StopIteration</span><span class="p">:</span>
			<span class="c"># Should be over.</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">_seen_stop_iteration</span> <span class="o">=</span> <span class="bp">True</span>
			<span class="k">raise</span>
		<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
			<span class="k">raise</span> <span class="n">ProducerFault</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>

		<span class="bp">self</span><span class="o">.</span><span class="n">transformer</span><span class="p">(</span><span class="n">nextdata</span><span class="p">)</span>

		<span class="c"># Distribute data to receivers.</span>
		<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">receivers</span><span class="p">:</span>
			<span class="n">x</span><span class="o">.</span><span class="n">accept</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">transformer</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">x</span><span class="o">.</span><span class="n">protocol</span><span class="p">))</span>

	<span class="k">def</span> <span class="nf">_service_receivers</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="n">faults</span> <span class="o">=</span> <span class="p">{}</span>
		<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">receivers</span><span class="p">:</span>
			<span class="c"># Process all the receivers.</span>
			<span class="k">try</span><span class="p">:</span>
				<span class="n">x</span><span class="o">.</span><span class="n">transmit</span><span class="p">()</span>
			<span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
				<span class="n">faults</span><span class="p">[</span><span class="n">x</span><span class="p">]</span> <span class="o">=</span> <span class="n">e</span>
		<span class="k">if</span> <span class="n">faults</span><span class="p">:</span>
			<span class="c"># The CopyManager is eager to continue the operation.</span>
			<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">faults</span><span class="p">:</span>
				<span class="bp">self</span><span class="o">.</span><span class="n">receivers</span><span class="o">.</span><span class="n">discard</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
			<span class="k">raise</span> <span class="n">ReceiverFault</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">faults</span><span class="p">)</span>

	<span class="c"># Run the COPY to completion.</span>
	<span class="k">def</span> <span class="nf">run</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">with</span> <span class="bp">self</span><span class="p">:</span>
			<span class="k">try</span><span class="p">:</span>
				<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
					<span class="bp">self</span><span class="o">.</span><span class="n">_service_producer</span><span class="p">()</span>
					<span class="bp">self</span><span class="o">.</span><span class="n">_service_receivers</span><span class="p">()</span>
			<span class="k">except</span> <span class="ne">StopIteration</span><span class="p">:</span>
				<span class="c"># It&#39;s done.</span>
				<span class="k">pass</span>

	<span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="k">return</span> <span class="bp">self</span>

	<span class="k">def</span> <span class="nf">__next__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
		<span class="n">messages</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">total_messages</span>
		<span class="nb">bytes</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">total_bytes</span>

		<span class="bp">self</span><span class="o">.</span><span class="n">_service_producer</span><span class="p">()</span>
		<span class="c"># Record the progress in case a receiver faults.</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_stats</span> <span class="o">=</span> <span class="p">(</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">_stats</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">+</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">total_messages</span> <span class="o">-</span> <span class="n">messages</span><span class="p">),</span>
			<span class="bp">self</span><span class="o">.</span><span class="n">_stats</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">+</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">total_bytes</span> <span class="o">-</span> <span class="nb">bytes</span><span class="p">),</span>
		<span class="p">)</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_service_receivers</span><span class="p">()</span>
		<span class="c"># Return the progress.</span>
		<span class="n">current_stats</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_stats</span>
		<span class="bp">self</span><span class="o">.</span><span class="n">_stats</span> <span class="o">=</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
		<span class="k">return</span> <span class="n">current_stats</span>
</div>
<div class="viewcode-block" id="transfer"><a class="viewcode-back" href="../../reference.html#postgresql.copyman.transfer">[docs]</a><span class="k">def</span> <span class="nf">transfer</span><span class="p">(</span><span class="n">producer</span><span class="p">,</span> <span class="o">*</span><span class="n">receivers</span><span class="p">):</span>
	<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">	Perform a COPY operation using the given statements::</span>

<span class="sd">		&gt;&gt;&gt; import copyman</span>
<span class="sd">		&gt;&gt;&gt; copyman.transfer(src.prepare(&quot;COPY table TO STDOUT&quot;), dst.prepare(&quot;COPY table FROM STDIN&quot;))</span>
<span class="sd">	&quot;&quot;&quot;</span>
	<span class="n">cm</span> <span class="o">=</span> <span class="n">CopyManager</span><span class="p">(</span>
		<span class="n">StatementProducer</span><span class="p">(</span><span class="n">producer</span><span class="p">),</span>
		<span class="o">*</span><span class="p">[</span><span class="n">x</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">Receiver</span><span class="p">)</span> <span class="k">else</span> <span class="n">StatementReceiver</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">receivers</span><span class="p">]</span>
	<span class="p">)</span>
	<span class="n">cm</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
	<span class="k">return</span> <span class="p">(</span><span class="n">cm</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">total_messages</span><span class="p">,</span> <span class="n">cm</span><span class="o">.</span><span class="n">producer</span><span class="o">.</span><span class="n">total_bytes</span><span class="p">)</span></div>
</pre></div>

          </div>
        </div>
      </div>
      <div class="sphinxsidebar">
        <div class="sphinxsidebarwrapper">
<div id="searchbox" style="display: none">
  <h3>Quick search</h3>
    <form class="search" action="../../search.html" method="get">
      <input type="text" name="q" />
      <input type="submit" value="Go" />
      <input type="hidden" name="check_keywords" value="yes" />
      <input type="hidden" name="area" value="default" />
    </form>
    <p class="searchtip" style="font-size: 90%">
    Enter search terms or a module, class or function name.
    </p>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
        </div>
      </div>
      <div class="clearer"></div>
    </div>
    <div class="related">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../../genindex.html" title="General Index"
             >index</a></li>
        <li class="right" >
          <a href="../../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li><a href="../../index.html">py-postgresql 1.1.0 documentation</a> &raquo;</li>
          <li><a href="../index.html" >Module code</a> &raquo;</li>
          <li><a href="../postgresql.html" >postgresql</a> &raquo;</li> 
      </ul>
    </div>
    <div class="footer">
        &copy; Copyright Python+Postgres.
      Last updated on Mar 31, 2014.
      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.2.
    </div>
  </body>
</html>