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annotate contrib/python-zstandard/tests/test_compressor_fuzzing.py @ 39878:3e896b51aa5d

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storageutil: move metadata parsing and packing from revlog (API) Parsing and writing of revision text metadata is likely identical across storage backends. Let's move the code out of revlog so we don't need to import the revlog module in order to use it. Differential Revision: https://phab.mercurial-scm.org/D4754
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 24 Sep 2018 14:31:31 -0700
parents b1fb341d8a61
children 73fef626dae3
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1 import io
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2 import os
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3 import unittest
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4
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5 try:
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6 import hypothesis
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7 import hypothesis.strategies as strategies
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8 except ImportError:
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9 raise unittest.SkipTest('hypothesis not available')
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10
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11 import zstandard as zstd
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12
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13 from . common import (
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14 make_cffi,
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15 random_input_data,
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16 )
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17
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18
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19 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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20 @make_cffi
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21 class TestCompressor_stream_reader_fuzzing(unittest.TestCase):
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22 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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23 level=strategies.integers(min_value=1, max_value=5),
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24 source_read_size=strategies.integers(1, 16384),
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25 read_sizes=strategies.data())
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26 def test_stream_source_read_variance(self, original, level, source_read_size,
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27 read_sizes):
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28 refctx = zstd.ZstdCompressor(level=level)
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29 ref_frame = refctx.compress(original)
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30
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31 cctx = zstd.ZstdCompressor(level=level)
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32 with cctx.stream_reader(io.BytesIO(original), size=len(original),
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33 read_size=source_read_size) as reader:
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34 chunks = []
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35 while True:
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36 read_size = read_sizes.draw(strategies.integers(1, 16384))
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37 chunk = reader.read(read_size)
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38
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39 if not chunk:
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40 break
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41 chunks.append(chunk)
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42
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43 self.assertEqual(b''.join(chunks), ref_frame)
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44
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45 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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46 level=strategies.integers(min_value=1, max_value=5),
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47 source_read_size=strategies.integers(1, 16384),
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48 read_sizes=strategies.data())
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49 def test_buffer_source_read_variance(self, original, level, source_read_size,
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50 read_sizes):
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51
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52 refctx = zstd.ZstdCompressor(level=level)
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53 ref_frame = refctx.compress(original)
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54
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55 cctx = zstd.ZstdCompressor(level=level)
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56 with cctx.stream_reader(original, size=len(original),
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57 read_size=source_read_size) as reader:
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58 chunks = []
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59 while True:
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60 read_size = read_sizes.draw(strategies.integers(1, 16384))
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61 chunk = reader.read(read_size)
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62 if not chunk:
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63 break
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64 chunks.append(chunk)
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65
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66 self.assertEqual(b''.join(chunks), ref_frame)
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67
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68
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69 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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70 @make_cffi
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71 class TestCompressor_stream_writer_fuzzing(unittest.TestCase):
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72 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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73 level=strategies.integers(min_value=1, max_value=5),
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74 write_size=strategies.integers(min_value=1, max_value=1048576))
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75 def test_write_size_variance(self, original, level, write_size):
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76 refctx = zstd.ZstdCompressor(level=level)
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77 ref_frame = refctx.compress(original)
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78
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79 cctx = zstd.ZstdCompressor(level=level)
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80 b = io.BytesIO()
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81 with cctx.stream_writer(b, size=len(original), write_size=write_size) as compressor:
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82 compressor.write(original)
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83
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84 self.assertEqual(b.getvalue(), ref_frame)
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85
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86
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87 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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88 @make_cffi
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89 class TestCompressor_copy_stream_fuzzing(unittest.TestCase):
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90 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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91 level=strategies.integers(min_value=1, max_value=5),
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92 read_size=strategies.integers(min_value=1, max_value=1048576),
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93 write_size=strategies.integers(min_value=1, max_value=1048576))
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94 def test_read_write_size_variance(self, original, level, read_size, write_size):
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95 refctx = zstd.ZstdCompressor(level=level)
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96 ref_frame = refctx.compress(original)
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97
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98 cctx = zstd.ZstdCompressor(level=level)
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99 source = io.BytesIO(original)
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100 dest = io.BytesIO()
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101
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102 cctx.copy_stream(source, dest, size=len(original), read_size=read_size,
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103 write_size=write_size)
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104
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105 self.assertEqual(dest.getvalue(), ref_frame)
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106
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107
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108 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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109 @make_cffi
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110 class TestCompressor_compressobj_fuzzing(unittest.TestCase):
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111 @hypothesis.settings(
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112 suppress_health_check=[hypothesis.HealthCheck.large_base_example])
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113 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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114 level=strategies.integers(min_value=1, max_value=5),
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115 chunk_sizes=strategies.data())
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116 def test_random_input_sizes(self, original, level, chunk_sizes):
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117 refctx = zstd.ZstdCompressor(level=level)
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118 ref_frame = refctx.compress(original)
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119
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120 cctx = zstd.ZstdCompressor(level=level)
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121 cobj = cctx.compressobj(size=len(original))
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122
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123 chunks = []
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124 i = 0
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125 while True:
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126 chunk_size = chunk_sizes.draw(strategies.integers(1, 4096))
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127 source = original[i:i + chunk_size]
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128 if not source:
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129 break
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130
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131 chunks.append(cobj.compress(source))
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132 i += chunk_size
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133
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134 chunks.append(cobj.flush())
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135
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136 self.assertEqual(b''.join(chunks), ref_frame)
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137
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138
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139 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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140 @make_cffi
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141 class TestCompressor_read_to_iter_fuzzing(unittest.TestCase):
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142 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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143 level=strategies.integers(min_value=1, max_value=5),
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144 read_size=strategies.integers(min_value=1, max_value=4096),
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145 write_size=strategies.integers(min_value=1, max_value=4096))
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146 def test_read_write_size_variance(self, original, level, read_size, write_size):
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147 refcctx = zstd.ZstdCompressor(level=level)
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148 ref_frame = refcctx.compress(original)
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149
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150 source = io.BytesIO(original)
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151
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152 cctx = zstd.ZstdCompressor(level=level)
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153 chunks = list(cctx.read_to_iter(source, size=len(original),
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154 read_size=read_size,
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155 write_size=write_size))
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156
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157 self.assertEqual(b''.join(chunks), ref_frame)
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158
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159
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160 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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161 class TestCompressor_multi_compress_to_buffer_fuzzing(unittest.TestCase):
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162 @hypothesis.given(original=strategies.lists(strategies.sampled_from(random_input_data()),
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163 min_size=1, max_size=1024),
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164 threads=strategies.integers(min_value=1, max_value=8),
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165 use_dict=strategies.booleans())
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166 def test_data_equivalence(self, original, threads, use_dict):
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167 kwargs = {}
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168
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169 # Use a content dictionary because it is cheap to create.
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170 if use_dict:
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171 kwargs['dict_data'] = zstd.ZstdCompressionDict(original[0])
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172
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173 cctx = zstd.ZstdCompressor(level=1,
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174 write_checksum=True,
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175 **kwargs)
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176
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177 result = cctx.multi_compress_to_buffer(original, threads=-1)
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178
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179 self.assertEqual(len(result), len(original))
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180
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181 # The frame produced via the batch APIs may not be bit identical to that
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182 # produced by compress() because compression parameters are adjusted
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183 # from the first input in batch mode. So the only thing we can do is
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184 # verify the decompressed data matches the input.
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185 dctx = zstd.ZstdDecompressor(**kwargs)
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186
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187 for i, frame in enumerate(result):
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188 self.assertEqual(dctx.decompress(frame), original[i])