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annotate contrib/python-zstandard/tests/common.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 675775c33ab6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 import imp
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2 import inspect
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3 import io
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4 import os
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5 import types
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6
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7 try:
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8 import hypothesis
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9 except ImportError:
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10 hypothesis = None
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11
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12
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13 def make_cffi(cls):
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14 """Decorator to add CFFI versions of each test method."""
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15
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16 # The module containing this class definition should
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17 # `import zstandard as zstd`. Otherwise things may blow up.
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18 mod = inspect.getmodule(cls)
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19 if not hasattr(mod, 'zstd'):
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20 raise Exception('test module does not contain "zstd" symbol')
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21
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22 if not hasattr(mod.zstd, 'backend'):
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23 raise Exception('zstd symbol does not have "backend" attribute; did '
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24 'you `import zstandard as zstd`?')
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25
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26 # If `import zstandard` already chose the cffi backend, there is nothing
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27 # for us to do: we only add the cffi variation if the default backend
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28 # is the C extension.
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29 if mod.zstd.backend == 'cffi':
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30 return cls
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31
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32 old_env = dict(os.environ)
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33 os.environ['PYTHON_ZSTANDARD_IMPORT_POLICY'] = 'cffi'
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34 try:
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35 try:
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36 mod_info = imp.find_module('zstandard')
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37 mod = imp.load_module('zstandard_cffi', *mod_info)
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38 except ImportError:
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39 return cls
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40 finally:
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41 os.environ.clear()
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42 os.environ.update(old_env)
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43
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44 if mod.backend != 'cffi':
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45 raise Exception('got the zstandard %s backend instead of cffi' % mod.backend)
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46
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47 # If CFFI version is available, dynamically construct test methods
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48 # that use it.
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49
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50 for attr in dir(cls):
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51 fn = getattr(cls, attr)
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52 if not inspect.ismethod(fn) and not inspect.isfunction(fn):
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53 continue
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54
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55 if not fn.__name__.startswith('test_'):
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56 continue
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57
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58 name = '%s_cffi' % fn.__name__
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59
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60 # Replace the "zstd" symbol with the CFFI module instance. Then copy
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61 # the function object and install it in a new attribute.
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62 if isinstance(fn, types.FunctionType):
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63 globs = dict(fn.__globals__)
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64 globs['zstd'] = mod
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65 new_fn = types.FunctionType(fn.__code__, globs, name,
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66 fn.__defaults__, fn.__closure__)
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67 new_method = new_fn
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68 else:
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69 globs = dict(fn.__func__.func_globals)
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70 globs['zstd'] = mod
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71 new_fn = types.FunctionType(fn.__func__.func_code, globs, name,
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72 fn.__func__.func_defaults,
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73 fn.__func__.func_closure)
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74 new_method = types.UnboundMethodType(new_fn, fn.im_self,
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75 fn.im_class)
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76
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77 setattr(cls, name, new_method)
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78
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79 return cls
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80
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81
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82 class OpCountingBytesIO(io.BytesIO):
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83 def __init__(self, *args, **kwargs):
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84 self._read_count = 0
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85 self._write_count = 0
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86 return super(OpCountingBytesIO, self).__init__(*args, **kwargs)
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87
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88 def read(self, *args):
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89 self._read_count += 1
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90 return super(OpCountingBytesIO, self).read(*args)
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91
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92 def write(self, data):
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93 self._write_count += 1
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94 return super(OpCountingBytesIO, self).write(data)
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95
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96
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97 _source_files = []
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98
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99
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100 def random_input_data():
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101 """Obtain the raw content of source files.
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102
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103 This is used for generating "random" data to feed into fuzzing, since it is
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104 faster than random content generation.
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105 """
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106 if _source_files:
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107 return _source_files
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108
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109 for root, dirs, files in os.walk(os.path.dirname(__file__)):
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110 dirs[:] = list(sorted(dirs))
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111 for f in sorted(files):
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112 try:
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113 with open(os.path.join(root, f), 'rb') as fh:
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114 data = fh.read()
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115 if data:
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116 _source_files.append(data)
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117 except OSError:
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118 pass
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119
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120 return _source_files
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121
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122
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123 def generate_samples():
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124 inputs = [
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125 b'foo',
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126 b'bar',
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127 b'abcdef',
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128 b'sometext',
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129 b'baz',
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130 ]
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131
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132 samples = []
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133
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134 for i in range(128):
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135 samples.append(inputs[i % 5])
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136 samples.append(inputs[i % 5] * (i + 3))
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137 samples.append(inputs[-(i % 5)] * (i + 2))
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138
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139 return samples
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140
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141
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142 if hypothesis:
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143 default_settings = hypothesis.settings()
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144 hypothesis.settings.register_profile('default', default_settings)
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145
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146 ci_settings = hypothesis.settings(max_examples=2500,
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147 max_iterations=2500)
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148 hypothesis.settings.register_profile('ci', ci_settings)
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149
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150 hypothesis.settings.load_profile(
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151 os.environ.get('HYPOTHESIS_PROFILE', 'default'))