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
|
# Copyright 2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# https://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
from boto3.dynamodb.table import BatchWriter
from tests import mock, unittest
class BaseTransformationTest(unittest.TestCase):
maxDiff = None
def setUp(self):
self.client = mock.Mock()
self.client.batch_write_item.return_value = {'UnprocessedItems': {}}
self.table_name = 'tablename'
self.flush_amount = 2
self.batch_writer = BatchWriter(
self.table_name, self.client, self.flush_amount
)
def assert_batch_write_calls_are(self, expected_batch_writes):
assert self.client.batch_write_item.call_count == len(
expected_batch_writes
)
batch_write_calls = [
args[1] for args in self.client.batch_write_item.call_args_list
]
assert batch_write_calls == expected_batch_writes
def test_batch_write_does_not_immediately_write(self):
self.batch_writer.put_item(Item={'Hash': 'foo'})
assert not self.client.batch_write_item.called
def test_batch_write_flushes_at_flush_amount(self):
self.batch_writer.put_item(Item={'Hash': 'foo1'})
self.batch_writer.put_item(Item={'Hash': 'foo2'})
expected = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
]
}
}
self.assert_batch_write_calls_are([expected])
def test_multiple_flushes_reset_items_to_put(self):
self.batch_writer.put_item(Item={'Hash': 'foo1'})
self.batch_writer.put_item(Item={'Hash': 'foo2'})
self.batch_writer.put_item(Item={'Hash': 'foo3'})
self.batch_writer.put_item(Item={'Hash': 'foo4'})
# We should have two batch calls, one for foo1,foo2 and
# one for foo3,foo4.
first_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
]
}
}
second_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
{'PutRequest': {'Item': {'Hash': 'foo4'}}},
]
}
}
self.assert_batch_write_calls_are([first_batch, second_batch])
def test_can_handle_puts_and_deletes(self):
self.batch_writer.put_item(Item={'Hash': 'foo1'})
self.batch_writer.delete_item(Key={'Hash': 'foo2'})
expected = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'DeleteRequest': {'Key': {'Hash': 'foo2'}}},
]
}
}
self.assert_batch_write_calls_are([expected])
def test_multiple_batch_calls_with_mixed_deletes(self):
self.batch_writer.put_item(Item={'Hash': 'foo1'})
self.batch_writer.delete_item(Key={'Hash': 'foo2'})
self.batch_writer.delete_item(Key={'Hash': 'foo3'})
self.batch_writer.put_item(Item={'Hash': 'foo4'})
first_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'DeleteRequest': {'Key': {'Hash': 'foo2'}}},
]
}
}
second_batch = {
'RequestItems': {
self.table_name: [
{'DeleteRequest': {'Key': {'Hash': 'foo3'}}},
{'PutRequest': {'Item': {'Hash': 'foo4'}}},
]
}
}
self.assert_batch_write_calls_are([first_batch, second_batch])
def test_unprocessed_items_added_to_next_batch(self):
self.client.batch_write_item.side_effect = [
{
'UnprocessedItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo2'}}}
],
},
},
# Then the last response shows that everything went through
{'UnprocessedItems': {}},
]
self.batch_writer.put_item(Item={'Hash': 'foo1'})
self.batch_writer.put_item(Item={'Hash': 'foo2'})
self.batch_writer.put_item(Item={'Hash': 'foo3'})
# We should have sent two batch requests consisting of 2
# 2 requests. foo1,foo2 and foo2,foo3.
# foo2 is sent twice because the first response has it listed
# as an unprocessed item which means it needs to be part
# of the next batch.
first_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
]
}
}
second_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
]
}
}
self.assert_batch_write_calls_are([first_batch, second_batch])
def test_all_items_flushed_on_exit(self):
with self.batch_writer as b:
b.put_item(Item={'Hash': 'foo1'})
self.assert_batch_write_calls_are(
[
{
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
]
},
},
]
)
def test_never_send_more_than_max_batch_size(self):
# Suppose the server sends backs a response that indicates that
# all the items were unprocessed.
self.client.batch_write_item.side_effect = [
{
'UnprocessedItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
],
},
},
{
'UnprocessedItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
],
},
},
{'UnprocessedItems': {}},
]
with BatchWriter(self.table_name, self.client, flush_amount=2) as b:
b.put_item(Item={'Hash': 'foo1'})
b.put_item(Item={'Hash': 'foo2'})
b.put_item(Item={'Hash': 'foo3'})
# Note how we're never sending more than flush_amount=2.
first_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
]
}
}
# Even when the server sends us unprocessed items of 2 elements,
# we'll still only send 2 at a time, in order.
second_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
]
}
}
# And then we still see one more unprocessed item so
# we need to send another batch.
third_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
]
}
}
self.assert_batch_write_calls_are(
[first_batch, second_batch, third_batch]
)
def test_repeated_flushing_on_exit(self):
# We're going to simulate unprocessed_items
# returning multiple unprocessed items across calls.
self.client.batch_write_item.side_effect = [
{
'UnprocessedItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
],
},
},
{
'UnprocessedItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
],
},
},
{'UnprocessedItems': {}},
]
with BatchWriter(self.table_name, self.client, flush_amount=4) as b:
b.put_item(Item={'Hash': 'foo1'})
b.put_item(Item={'Hash': 'foo2'})
b.put_item(Item={'Hash': 'foo3'})
# So when we exit, we expect three calls.
# First we try the normal batch write with 3 items:
first_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
]
}
}
# Then we see two unprocessed items so we send another batch.
second_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
]
}
}
# And then we still see one more unprocessed item so
# we need to send another batch.
third_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
]
}
}
self.assert_batch_write_calls_are(
[first_batch, second_batch, third_batch]
)
def test_auto_dedup_for_dup_requests(self):
with BatchWriter(
self.table_name,
self.client,
flush_amount=5,
overwrite_by_pkeys=["pkey", "skey"],
) as b:
# dup 1
b.put_item(
Item={'pkey': 'foo1', 'skey': 'bar1', 'other': 'other1'}
)
b.put_item(
Item={'pkey': 'foo1', 'skey': 'bar1', 'other': 'other2'}
)
# dup 2
b.delete_item(
Key={
'pkey': 'foo1',
'skey': 'bar2',
}
)
b.put_item(
Item={'pkey': 'foo1', 'skey': 'bar2', 'other': 'other3'}
)
# dup 3
b.put_item(
Item={'pkey': 'foo2', 'skey': 'bar2', 'other': 'other3'}
)
b.delete_item(
Key={
'pkey': 'foo2',
'skey': 'bar2',
}
)
# dup 4
b.delete_item(
Key={
'pkey': 'foo2',
'skey': 'bar3',
}
)
b.delete_item(
Key={
'pkey': 'foo2',
'skey': 'bar3',
}
)
# 5
b.delete_item(
Key={
'pkey': 'foo3',
'skey': 'bar3',
}
)
# 2nd batch
b.put_item(
Item={'pkey': 'foo1', 'skey': 'bar1', 'other': 'other1'}
)
b.put_item(
Item={'pkey': 'foo1', 'skey': 'bar1', 'other': 'other2'}
)
first_batch = {
'RequestItems': {
self.table_name: [
{
'PutRequest': {
'Item': {
'pkey': 'foo1',
'skey': 'bar1',
'other': 'other2',
}
}
},
{
'PutRequest': {
'Item': {
'pkey': 'foo1',
'skey': 'bar2',
'other': 'other3',
}
}
},
{
'DeleteRequest': {
'Key': {
'pkey': 'foo2',
'skey': 'bar2',
}
}
},
{
'DeleteRequest': {
'Key': {
'pkey': 'foo2',
'skey': 'bar3',
}
}
},
{
'DeleteRequest': {
'Key': {
'pkey': 'foo3',
'skey': 'bar3',
}
}
},
]
}
}
second_batch = {
'RequestItems': {
self.table_name: [
{
'PutRequest': {
'Item': {
'pkey': 'foo1',
'skey': 'bar1',
'other': 'other2',
}
}
},
]
}
}
self.assert_batch_write_calls_are([first_batch, second_batch])
def test_added_unsent_request_not_flushed_put(self):
# If n requests that get sent fail to process where n = flush_amount
# and at least one more request gets created before the second attempt,
# then previously if n requests were successful on the next run and
# returned an empty dict, _item_buffer would be emptied before sending
# the next batch of n requests
self.client.batch_write_item.side_effect = [
{
'UnprocessedItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
],
},
},
{
'UnprocessedItems': {},
},
{
'UnprocessedItems': {},
},
]
self.batch_writer.put_item({'Hash': 'foo1'})
self.batch_writer.put_item({'Hash': 'foo2'})
self.batch_writer.put_item({'Hash': 'foo3'})
self.assertIn(
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
self.batch_writer._items_buffer,
)
batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo1'}}},
{'PutRequest': {'Item': {'Hash': 'foo2'}}},
]
}
}
final_batch = {
'RequestItems': {
self.table_name: [
{'PutRequest': {'Item': {'Hash': 'foo3'}}},
{'PutRequest': {'Item': {'Hash': 'foo4'}}},
]
}
}
# same batch sent twice since all failed on first try
# and flush_items = 2
self.assert_batch_write_calls_are([batch, batch])
# test that the next two items get sent
self.batch_writer.put_item({'Hash': 'foo4'})
self.assert_batch_write_calls_are([batch, batch, final_batch])
# the buffer should be empty now
self.assertEqual(self.batch_writer._items_buffer, [])
def test_added_unsent_request_not_flushed_delete(self):
# If n requests that get sent fail to process where n = flush_amount
# and at least one more request gets created before the second attempt,
# then previously if n requests were successful on the next run and
# returned an empty dict, _item_buffer would be emptied before sending
# the next batch of n requests
self.client.batch_write_item.side_effect = [
{
'UnprocessedItems': {
self.table_name: [
{'DeleteRequest': {'Key': {'Hash': 'foo1'}}},
{'DeleteRequest': {'Key': {'Hash': 'foo2'}}},
],
},
},
{
'UnprocessedItems': {},
},
{
'UnprocessedItems': {},
},
]
self.batch_writer.delete_item({'Hash': 'foo1'})
self.batch_writer.delete_item({'Hash': 'foo2'})
self.batch_writer.delete_item({'Hash': 'foo3'})
self.assertIn(
{'DeleteRequest': {'Key': {'Hash': 'foo3'}}},
self.batch_writer._items_buffer,
)
batch = {
'RequestItems': {
self.table_name: [
{'DeleteRequest': {'Key': {'Hash': 'foo1'}}},
{'DeleteRequest': {'Key': {'Hash': 'foo2'}}},
]
}
}
final_batch = {
'RequestItems': {
self.table_name: [
{'DeleteRequest': {'Key': {'Hash': 'foo3'}}},
{'DeleteRequest': {'Key': {'Hash': 'foo4'}}},
]
}
}
# same batch sent twice since all failed on first try
# and flush_items = 2
self.assert_batch_write_calls_are([batch, batch])
# test that the next two items get sent
self.batch_writer.delete_item({'Hash': 'foo4'})
self.assert_batch_write_calls_are([batch, batch, final_batch])
# the buffer should be empty now
self.assertEqual(self.batch_writer._items_buffer, [])
|
