This file is indexed.

/usr/lib/python3/dist-packages/postgresql/test/test_copyman.py 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
##
# .test.test_copyman - test .copyman
##
import unittest
from itertools import islice
from .. import copyman
from ..temporal import pg_tmp
# The asyncs, and alternative termination.
from ..protocol.element3 import Notice, Notify, Error, cat_messages
from .. import exceptions as pg_exc

# state manager can handle empty data messages, right? =)
emptysource = """
CREATE TEMP TABLE emptysource ();
-- 10
INSERT INTO emptysource DEFAULT VALUES;
INSERT INTO emptysource DEFAULT VALUES;
INSERT INTO emptysource DEFAULT VALUES;
INSERT INTO emptysource DEFAULT VALUES;
INSERT INTO emptysource DEFAULT VALUES;
INSERT INTO emptysource DEFAULT VALUES;
INSERT INTO emptysource DEFAULT VALUES;
INSERT INTO emptysource DEFAULT VALUES;
INSERT INTO emptysource DEFAULT VALUES;
INSERT INTO emptysource DEFAULT VALUES;
"""
emptydst = "CREATE TEMP TABLE empty ();"

# The usual subjects.
stdrowcount = 10000
stdsource = """
CREATE TEMP TABLE source (i int, t text);
INSERT INTO source
	SELECT i, i::text AS t
	FROM generate_series(1, {0}) AS g(i);
""".format(stdrowcount)
stditer = [
	b'\t'.join((x, x)) + b'\n'
	for x in (
		str(i).encode('ascii') for i in range(1, 10001)
	)
]
stditer_tuples = [
	(x, str(x)) for x in range(1, 10001)
]

stddst = "CREATE TEMP TABLE destination (i int, t text)"
srcsql = "COPY source TO STDOUT"
dstsql = "COPY destination FROM STDIN"
binary_srcsql = "COPY source TO STDOUT WITH BINARY"
binary_dstsql = "COPY destination FROM STDIN WITH BINARY"
dstcount = "SELECT COUNT(*) FROM destination"
grabdst = "SELECT * FROM destination ORDER BY i ASC"
grabsrc = "SELECT * FROM source ORDER BY i ASC"

##
# This subclass is used to append some arbitrary data
# after the initial data. This is used to exercise async/notice support.
class Injector(copyman.StatementProducer):
	def __init__(self, appended_messages, *args, **kw):
		super().__init__(*args, **kw)
		self._appended_messages = appended_messages

	def confiscate(self):
		pq = self.statement.database.pq
		mb = pq.message_buffer
		b = mb.getvalue()
		mb.truncate()
		mb.write(cat_messages(self._appended_messages))
		mb.write(b)
		return super().confiscate()

class test_copyman(unittest.TestCase):
	def testNull(self):
		# Test some of the basic machinery.
		sp = copyman.NullProducer()
		sr = copyman.NullReceiver()
		copyman.CopyManager(sp, sr).run()
		self.assertEqual(sp.total_messages, 0)
		self.assertEqual(sp.total_bytes, 0)

	@pg_tmp
	def testNullProducer(self):
		sqlexec(stddst)
		np = copyman.NullProducer()
		sr = copyman.StatementReceiver(prepare(dstsql))
		copyman.CopyManager(np, sr).run()
		self.assertEqual(np.total_messages, 0)
		self.assertEqual(np.total_bytes, 0)
		self.assertEqual(prepare(dstcount).first(), 0)
		self.assertEqual(prepare(grabdst)(), [])

	@pg_tmp
	def testNullReceiver(self):
		sqlexec(stdsource)
		sp = copyman.StatementProducer(prepare(srcsql), buffer_size = 128)
		sr = copyman.NullReceiver()
		with copyman.CopyManager(sp, sr) as copy:
			for x in copy:
				pass
		self.assertEqual(sp.total_messages, stdrowcount)
		self.assertEqual(sp.total_bytes > 0, True)

	def testIteratorToCall(self):
		tmp = iter(stditer)
		# segment stditer into chunks consisting of twenty rows each
		sp = copyman.IteratorProducer([
			list(islice(tmp, 20)) for x in range(len(stditer) // 20)
		])
		dest = []
		sr = copyman.CallReceiver(dest.extend)
		recomputed_bytes = 0
		recomputed_messages = 0
		with copyman.CopyManager(sp, sr) as copy:
			for msg, bytes in copy:
				recomputed_messages += msg
				recomputed_bytes += bytes
		self.assertEqual(stdrowcount, recomputed_messages)
		self.assertEqual(recomputed_bytes, sp.total_bytes)
		self.assertEqual(len(dest), stdrowcount)
		self.assertEqual(dest, stditer)

	@pg_tmp
	def testDirectStatements(self):
		sqlexec(stdsource)
		dst = new()
		dst.execute(stddst)
		sp = copyman.StatementProducer(prepare(srcsql), buffer_size = 512)
		sr = copyman.StatementReceiver(dst.prepare(dstsql))
		with copyman.CopyManager(sp, sr) as copy:
			for x in copy:
				pass
		self.assertEqual(dst.prepare(dstcount).first(), stdrowcount)
		self.assertEqual(dst.prepare(grabdst)(), prepare(grabsrc)())

	@pg_tmp
	def testIteratorProducer(self):
		sqlexec(stddst)
		sp = copyman.IteratorProducer([stditer])
		sr = copyman.StatementReceiver(prepare(dstsql))
		recomputed_bytes = 0
		recomputed_messages = 0
		with copyman.CopyManager(sp, sr) as copy:
			for msg, bytes in copy:
				recomputed_messages += msg
				recomputed_bytes += bytes
		self.assertEqual(stdrowcount, recomputed_messages)
		self.assertEqual(recomputed_bytes, sp.total_bytes)
		self.assertEqual(prepare(dstcount).first(), stdrowcount)
		self.assertEqual(prepare(grabdst)(), stditer_tuples)

	def multiple_destinations(self, count = 3, binary = False, buffer_size = 129):
		if binary:
			src = binary_srcsql
			dst = binary_dstsql
			# accommodate for the binary header.
			count_offset = 1
		else:
			src = srcsql
			dst = dstsql
			count_offset = 0
		sqlexec(stdsource)
		dests = [new() for x in range(count)]
		receivers = []
		for x in dests:
			x.execute(stddst)
			receivers.append(copyman.StatementReceiver(x.prepare(dst)))
		sp = copyman.StatementProducer(prepare(src), buffer_size = buffer_size)
		recomputed_bytes = 0
		recomputed_messages = 0
		with copyman.CopyManager(sp, *receivers) as copy:
			for msg, bytes in copy:
				recomputed_messages += msg
				recomputed_bytes += bytes
		src_snap = prepare(grabsrc)()
		for x in dests:
			self.assertEqual(x.prepare(dstcount).first(), stdrowcount)
			self.assertEqual(x.prepare(grabdst)(), src_snap)
		self.assertEqual(stdrowcount + count_offset, recomputed_messages)
		self.assertEqual(recomputed_bytes, sp.total_bytes)

	@pg_tmp
	def testMultipleStatements(self):
		self.multiple_destinations()

	@pg_tmp
	def testMultipleStatementsBinary(self):
		self.multiple_destinations(binary = True)

	@pg_tmp
	def testMultipleStatementsSmallBuffer(self):
		self.multiple_destinations(buffer_size = 11)

	@pg_tmp
	def testNotices(self):
		# Inject a Notices directly into the stream to emulate
		# cases of asynchronous messages received during COPY.
		notices = [
			Notice((
				(b'S', b'NOTICE'),
				(b'C', b'00000'),
				(b'M', b'It\'s a beautiful day.'),
			)),
			Notice((
				(b'S', b'WARNING'),
				(b'C', b'01X1X1'),
				(b'M', b'FAILURE IS CERTAIN'),
			))
		]
		sqlexec(stdsource)
		dst = new()
		dst.execute(stddst)
		# hook for notices..
		rmessages = []
		def hook(msg):
			rmessages.append(msg)
			# suppress
			return True
		stmt = prepare(srcsql)
		stmt.msghook = hook
		sp = Injector(notices, stmt, buffer_size = 133)
		sr = copyman.StatementReceiver(dst.prepare(dstsql))
		seen_in_loop = 0
		with copyman.CopyManager(sp, sr) as copy:
			for x in copy:
				if rmessages:
					# Should get hooked before the COPY is over.
					seen_in_loop += 1
		self.assertTrue(seen_in_loop > 0)
		self.assertEqual(dst.prepare(dstcount).first(), stdrowcount)
		self.assertEqual(dst.prepare(grabdst)(), prepare(grabsrc)())
		# The injector adds then everytime the wire data is confiscated
		# from the protocol connection.
		notice, warning = rmessages[:2]
		self.assertEqual(notice.code, "00000")
		self.assertEqual(warning.code, "01X1X1")
		self.assertEqual(warning.details['severity'], "WARNING")
		self.assertEqual(notice.message, "It's a beautiful day.")
		self.assertEqual(warning.message, "FAILURE IS CERTAIN")
		self.assertEqual(notice.details['severity'], "NOTICE")

	@pg_tmp
	def testAsyncNotify(self):
		# Inject a NOTIFY directly into the stream to emulate
		# cases of asynchronous messages received during COPY.
		notify = [Notify(1234, b'channel', b'payload')]
		sqlexec(stdsource)
		dst = new()
		dst.execute(stddst)
		sp = Injector(notify, prepare(srcsql), buffer_size = 32)
		sr = copyman.StatementReceiver(dst.prepare(dstsql))
		seen_in_loop = 0
		r = []
		with copyman.CopyManager(sp, sr) as copy:
			for x in copy:
				r += list(db.iternotifies(0))
		# Got the injected NOTIFY's, right?
		self.assertTrue(r)
		# it may have happened multiple times, so adjust accordingly.
		self.assertEqual(r, [('channel', 'payload', 1234)]*len(r))

	@pg_tmp
	def testUnfinishedCopy(self):
		sqlexec(stdsource)
		dst = new()
		dst.execute(stddst)
		sp = copyman.StatementProducer(prepare(srcsql), buffer_size = 32)
		sr = copyman.StatementReceiver(dst.prepare(dstsql))
		try:
			with copyman.CopyManager(sp, sr) as copy:
				for x in copy:
					break
			self.fail("did not raise CopyFail")
		except copyman.CopyFail:
			pass

	@pg_tmp
	def testRaiseInCopy(self):
		sqlexec(stdsource)
		dst = new()
		dst.execute(stddst)
		sp = copyman.StatementProducer(prepare(srcsql), buffer_size = 128)
		sr = copyman.StatementReceiver(dst.prepare(dstsql))
		i = 0
		class ThisError(Exception):
			pass
		try:
			with copyman.CopyManager(sp, sr) as copy:
				for x in copy:
					# Note, the state of the receiver has changed.
					# We may not be on a message boundary, so this test
					# exercises cases where an interrupt occurs where
					# re-alignment *may* need to occur.
					raise ThisError()
		except copyman.CopyFail as cf:
			# It's a copy failure, but due to ThisError.
			self.assertTrue(isinstance(cf.__context__, ThisError))
		else:
			self.fail("didn't raise CopyFail")
		# Connections should be usable.
		self.assertEqual(prepare('select 1').first(), 1)
		self.assertEqual(dst.prepare('select 1').first(), 1)

	@pg_tmp
	def testRaiseInCopyOnEnter(self):
		sqlexec(stdsource)
		dst = new()
		dst.execute(stddst)
		sp = copyman.StatementProducer(prepare(srcsql), buffer_size = 128)
		sr = copyman.StatementReceiver(dst.prepare(dstsql))
		i = 0
		class ThatError(Exception):
			pass
		try:
			with copyman.CopyManager(sp, sr) as copy:
				raise ThatError()
		except copyman.CopyFail as cf:
			# yeah; error on incomplete COPY
			self.assertTrue(isinstance(cf.__context__, ThatError))
		else:
			self.fail("didn't raise CopyFail")

	@pg_tmp
	def testCopyWithFailure(self):
		sqlexec(stdsource)
		dst = new()
		dst2 = new()
		dst.execute(stddst)
		dst2.execute(stddst)
		sp = copyman.StatementProducer(prepare(srcsql), buffer_size = 128)
		sr1 = copyman.StatementReceiver(dst.prepare(dstsql))
		sr2 = copyman.StatementReceiver(dst2.prepare(dstsql))
		done = False
		with copyman.CopyManager(sp, sr1, sr2) as copy:
			while True:
				try:
					for x in copy:
						if not done:
							done = True
							dst2.pq.socket.close()
					else:
						# Done with copy.
						break
				except copyman.ReceiverFault as cf:
					if sr2 not in cf.faults:
						raise
		self.assertTrue(done)
		self.assertRaises(Exception, dst2.execute, 'select 1')
		self.assertEqual(dst.prepare(dstcount).first(), stdrowcount)
		self.assertEqual(dst.prepare(grabdst)(), prepare(grabsrc)())

	@pg_tmp
	def testEmptyRows(self):
		sqlexec(emptysource)
		dst = new()
		dst.execute(emptydst)
		sp = copyman.StatementProducer(prepare("COPY emptysource TO STDOUT"), buffer_size = 127)
		sr = copyman.StatementReceiver(dst.prepare("COPY empty FROM STDIN"))
		m = 0
		b = 0
		with copyman.CopyManager(sp, sr) as copy:
			for x in copy:
				nmsg, nbytes = x
				m += nmsg
				b += nbytes
		self.assertEqual(m, 10)
		self.assertEqual(prepare("SELECT COUNT(*) FROM emptysource").first(), 10)
		self.assertEqual(dst.prepare("SELECT COUNT(*) FROM empty").first(), 10)
		self.assertEqual(sr.count(), 10)
		self.assertEqual(sp.count(), 10)

	@pg_tmp
	def testCopyOne(self):
		from io import BytesIO
		b = BytesIO()
		copyman.transfer(
			prepare('COPY (SELECT 1) TO STDOUT'),
			copyman.CallReceiver(b.writelines)
		)
		b.seek(0)
		self.assertEqual(b.read(), b'1\n')

	@pg_tmp
	def testCopyNone(self):
		from io import BytesIO
		b = BytesIO()
		copyman.transfer(
			prepare('COPY (SELECT 1 LIMIT 0) TO STDOUT'),
			copyman.CallReceiver(b.writelines)
		)
		b.seek(0)
		self.assertEqual(b.read(), b'')

	@pg_tmp
	def testNoReceivers(self):
		sqlexec(stdsource)
		dst = new()
		dst.execute(stddst)
		sp = copyman.StatementProducer(prepare(srcsql))
		sr1 = copyman.StatementReceiver(dst.prepare(dstsql))
		done = False
		try:
			with copyman.CopyManager(sp, sr1) as copy:
				while not done:
					try:
						for x in copy:
							if not done:
								done = True
								dst.pq.socket.close()
							else:
								self.fail("failed to detect dead socket")
					except copyman.ReceiverFault as cf:
						self.assertTrue(sr1 in cf.faults)
						# Don't reconcile. Let the manager drop the receiver.
		except copyman.CopyFail:
			self.assertTrue(not bool(copy.receivers))
			# Success.
		else:
			self.fail("did not raise expected error")
		# Let the exception cause a failure.
		self.assertTrue(done)

	@pg_tmp
	def testReconciliation(self):
		# cm.reconcile() test.
		sqlexec(stdsource)
		dst = new()
		dst.execute(stddst)
		sp = copyman.StatementProducer(prepare(srcsql), buffer_size = 201)
		sr = copyman.StatementReceiver(dst.prepare(dstsql))

		original_call = sr.send
		class RecoverableError(Exception):
			pass
		def failed_write(*args):
			sr.send = original_call
			raise RecoverableError()
		sr.send = failed_write

		done = False
		recomputed_messages = 0
		recomputed_bytes = 0
		with copyman.CopyManager(sp, sr) as copy:
			while copy.receivers:
				try:
					for nmsg, nbytes in copy:
						recomputed_messages += nmsg
						recomputed_bytes += nbytes
					else:
						# Done with COPY, break out of while copy.receivers.
						break
				except copyman.ReceiverFault as cf:
					if isinstance(cf.faults[sr], RecoverableError):
						if done is True:
							self.fail("failed_write was called twice?")
						done = True
						self.assertEqual(len(copy.receivers), 0)
						copy.reconcile(sr)
						self.assertEqual(len(copy.receivers), 1)

		self.assertEqual(done, True)

		# Connections should be usable.
		self.assertEqual(prepare('select 1').first(), 1)
		self.assertEqual(dst.prepare('select 1').first(), 1)
		# validate completion
		self.assertEqual(stdrowcount, recomputed_messages)
		self.assertEqual(recomputed_bytes, sp.total_bytes)
		self.assertEqual(dst.prepare(dstcount).first(), stdrowcount)

	@pg_tmp
	def testDroppedConnection(self):
		# no cm.reconcile() test.
		sqlexec(stdsource)
		dst = new()
		dst2 = new()
		dst2.execute(stddst)
		dst.execute(stddst)
		sp = copyman.StatementProducer(prepare(srcsql), buffer_size = 201)
		sr1 = copyman.StatementReceiver(dst.prepare(dstsql))
		sr2 = copyman.StatementReceiver(dst2.prepare(dstsql))

		class TheCause(Exception):
			pass
		def failed_write(*args):
			raise TheCause()
		sr2.send = failed_write

		done = False
		recomputed_messages = 0
		recomputed_bytes = 0
		with copyman.CopyManager(sp, sr1, sr2) as copy:
			while copy.receivers:
				try:
					for nmsg, nbytes in copy:
						recomputed_messages += nmsg
						recomputed_bytes += nbytes
					else:
						# Done with COPY, break out of while copy.receivers.
						break
				except copyman.ReceiverFault as cf:
					self.assertTrue(isinstance(cf.faults[sr2], TheCause))
					if done is True:
						self.fail("failed_write was called twice?")
					done = True
					self.assertEqual(len(copy.receivers), 1)
					dst2.pq.socket.close()
					# We don't reconcile, so the manager only has one target now.

		self.assertEqual(done, True)
		# May not be aligned; really, we're expecting the connection to
		# have died.
		self.assertRaises(Exception, dst2.execute, "SELECT 1")

		# Connections should be usable.
		self.assertEqual(prepare('select 1').first(), 1)
		self.assertEqual(dst.prepare('select 1').first(), 1)
		# validate completion
		self.assertEqual(stdrowcount, recomputed_messages)
		self.assertEqual(recomputed_bytes, sp.total_bytes)
		self.assertEqual(dst.prepare(dstcount).first(), stdrowcount)
		self.assertEqual(sp.count(), stdrowcount)
		self.assertEqual(sp.command(), "COPY")

	@pg_tmp
	def testProducerFailure(self):
		sqlexec(stdsource)
		dst = new()
		dst.execute(stddst)
		sp = copyman.StatementProducer(prepare(srcsql))
		sr = copyman.StatementReceiver(dst.prepare(dstsql))
		done = False
		try:
			with copyman.CopyManager(sp, sr) as copy:
				try:
					for x in copy:
						if not done:
							done = True
							db.pq.socket.close()
				except copyman.ProducerFault as pf:
					self.assertTrue(pf.__context__ is not None)
			self.fail('expected CopyManager to raise CopyFail')
		except copyman.CopyFail as cf:
			# Expecting to see CopyFail
			self.assertTrue(True)
			self.assertTrue(isinstance(cf.producer_fault, pg_exc.ConnectionFailureError))
		self.assertTrue(done)
		self.assertRaises(Exception, sqlexec, 'select 1')
		self.assertEqual(dst.prepare(dstcount).first(), 0)

from ..copyman import WireState

class test_WireState(unittest.TestCase):
	def testNormal(self):
		WS=WireState()
		messages = WS.update(memoryview(b'd\x00\x00\x00\x04'))
		self.assertEqual(messages, 1)
		self.assertEqual(WS.remaining_bytes, 0)
		self.assertEqual(WS.size_fragment, b'')
		self.assertEqual(WS.final_view, None)

	def testIncomplete(self):
		WS=WireState()
		messages = WS.update(memoryview(b'd\x00\x00\x00\x05'))
		self.assertEqual(messages, 0)
		self.assertEqual(WS.remaining_bytes, 1)
		self.assertEqual(WS.size_fragment, b'')
		self.assertEqual(WS.final_view, None)
		messages = WS.update(memoryview(b'x'))
		self.assertEqual(messages, 1)
		self.assertEqual(WS.remaining_bytes, 0)
		self.assertEqual(WS.size_fragment, b'')
		self.assertEqual(WS.final_view, None)

	def testIncompleteHeader_0size(self):
		WS=WireState()
		messages = WS.update(memoryview(b'd'))
		self.assertEqual(messages, 0)
		self.assertEqual(WS.remaining_bytes, -1)
		self.assertEqual(WS.size_fragment, b'')
		self.assertEqual(WS.final_view, None)
		messages = WS.update(b'\x00\x00\x00\x04')
		self.assertEqual(messages, 1)

	def testIncompleteHeader_1size(self):
		WS=WireState()
		messages = WS.update(memoryview(b'd\x00'))
		self.assertEqual(messages, 0)
		self.assertEqual(WS.size_fragment, b'\x00')
		self.assertEqual(WS.final_view, None)
		self.assertEqual(WS.remaining_bytes, -1)
		messages = WS.update(memoryview(b'\x00\x00\x04'))
		self.assertEqual(messages, 1)
		self.assertEqual(WS.remaining_bytes, 0)

	def testIncompleteHeader_2size(self):
		WS=WireState()
		messages = WS.update(memoryview(b'd\x00\x00'))
		self.assertEqual(messages, 0)
		self.assertEqual(WS.remaining_bytes, -1)
		self.assertEqual(WS.size_fragment, b'\x00\x00')
		self.assertEqual(WS.final_view, None)
		messages = WS.update(b'\x00\x04')
		self.assertEqual(messages, 1)
		self.assertEqual(WS.remaining_bytes, 0)

	def testIncompleteHeader_3size(self):
		WS=WireState()
		messages = WS.update(memoryview(b'd\x00\x00\x00'))
		self.assertEqual(messages, 0)
		self.assertEqual(WS.remaining_bytes, -1)
		self.assertEqual(WS.size_fragment, b'\x00\x00\x00')
		self.assertEqual(WS.final_view, None)
		messages = WS.update(memoryview(b'\x04'))
		self.assertEqual(messages, 1)
		self.assertEqual(WS.remaining_bytes, 0)

if __name__ == '__main__':
	unittest.main()