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annotate tests/test-stdio.py @ 45097:dff208398ede

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tests: check that procutil.std{out,err}.write() returns correct result On Windows, we currently don?t fully test the case when the stream is connected to a TTY, but we test the child process side by connecting them to NUL, which is recognized as a TTY by Python. To make the large write test a bit more useful besides checking that it doesn?t crash, we can check that the write() method returns the correct result.
author Manuel Jacob <me@manueljacob.de>
date Thu, 09 Jul 2020 12:52:04 +0200
parents e9e452eafbfb
children eb26a9cf7821
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python
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2 """
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3 Tests the buffering behavior of stdio streams in `mercurial.utils.procutil`.
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4 """
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5 from __future__ import absolute_import
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6
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7 import contextlib
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8 import errno
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9 import os
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10 import signal
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11 import subprocess
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12 import sys
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13 import tempfile
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14 import unittest
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15
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16 from mercurial import pycompat
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17
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18
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19 TEST_BUFFERING_CHILD_SCRIPT = r'''
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20 import os
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21
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22 from mercurial import dispatch
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23 from mercurial.utils import procutil
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24
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25 dispatch.initstdio()
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26 procutil.{stream}.write(b'aaa')
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27 os.write(procutil.{stream}.fileno(), b'[written aaa]')
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28 procutil.{stream}.write(b'bbb\n')
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29 os.write(procutil.{stream}.fileno(), b'[written bbb\\n]')
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30 '''
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31 UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]'
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32 LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]'
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33 FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n'
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34
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35
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36 TEST_LARGE_WRITE_CHILD_SCRIPT = r'''
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37 import signal
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38 import sys
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39
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40 from mercurial import dispatch
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41 from mercurial.utils import procutil
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42
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43 signal.signal(signal.SIGINT, lambda *x: None)
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44 dispatch.initstdio()
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45 write_result = procutil.{stream}.write(b'x' * 1048576)
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46 with open({write_result_fn}, 'w') as write_result_f:
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47 write_result_f.write(str(write_result))
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48 '''
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49
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50
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51 @contextlib.contextmanager
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52 def _closing(fds):
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53 try:
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54 yield
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55 finally:
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56 for fd in fds:
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57 try:
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58 os.close(fd)
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59 except EnvironmentError:
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60 pass
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61
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62
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63 @contextlib.contextmanager
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64 def _devnull():
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65 devnull = os.open(os.devnull, os.O_WRONLY)
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66 with _closing([devnull]):
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67 yield (None, devnull)
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68
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69
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70 @contextlib.contextmanager
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71 def _pipes():
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72 rwpair = os.pipe()
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73 with _closing(rwpair):
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74 yield rwpair
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75
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76
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77 @contextlib.contextmanager
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78 def _ptys():
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79 if pycompat.iswindows:
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80 raise unittest.SkipTest("PTYs are not supported on Windows")
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81 import pty
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82 import tty
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83
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84 rwpair = pty.openpty()
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85 with _closing(rwpair):
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86 tty.setraw(rwpair[0])
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87 yield rwpair
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88
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89
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90 def _readall(fd, buffer_size, initial_buf=None):
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91 buf = initial_buf or []
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92 while True:
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93 try:
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94 s = os.read(fd, buffer_size)
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95 except OSError as e:
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96 if e.errno == errno.EIO:
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97 # If the child-facing PTY got closed, reading from the
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98 # parent-facing PTY raises EIO.
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99 break
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100 raise
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101 if not s:
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102 break
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103 buf.append(s)
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104 return b''.join(buf)
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105
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106
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107 class TestStdio(unittest.TestCase):
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108 def _test(
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109 self,
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110 child_script,
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111 stream,
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112 rwpair_generator,
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113 check_output,
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114 python_args=[],
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115 post_child_check=None,
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116 ):
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117 assert stream in ('stdout', 'stderr')
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118 with rwpair_generator() as (stream_receiver, child_stream), open(
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119 os.devnull, 'rb'
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120 ) as child_stdin:
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121 proc = subprocess.Popen(
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122 [sys.executable] + python_args + ['-c', child_script],
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123 stdin=child_stdin,
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124 stdout=child_stream if stream == 'stdout' else None,
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125 stderr=child_stream if stream == 'stderr' else None,
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126 )
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127 try:
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128 os.close(child_stream)
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129 if stream_receiver is not None:
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130 check_output(stream_receiver, proc)
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131 except: # re-raises
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132 proc.terminate()
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133 raise
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134 finally:
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135 retcode = proc.wait()
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136 self.assertEqual(retcode, 0)
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137 if post_child_check is not None:
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138 post_child_check()
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139
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140 def _test_buffering(
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141 self, stream, rwpair_generator, expected_output, python_args=[]
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142 ):
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143 def check_output(stream_receiver, proc):
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144 self.assertEqual(_readall(stream_receiver, 1024), expected_output)
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145
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146 self._test(
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147 TEST_BUFFERING_CHILD_SCRIPT.format(stream=stream),
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148 stream,
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149 rwpair_generator,
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150 check_output,
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151 python_args,
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152 )
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153
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154 def test_buffering_stdout_devnull(self):
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155 self._test_buffering('stdout', _devnull, None)
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156
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157 def test_buffering_stdout_pipes(self):
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158 self._test_buffering('stdout', _pipes, FULLY_BUFFERED)
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159
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160 def test_buffering_stdout_ptys(self):
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161 self._test_buffering('stdout', _ptys, LINE_BUFFERED)
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162
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163 def test_buffering_stdout_devnull_unbuffered(self):
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164 self._test_buffering('stdout', _devnull, None, python_args=['-u'])
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165
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166 def test_buffering_stdout_pipes_unbuffered(self):
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167 self._test_buffering('stdout', _pipes, UNBUFFERED, python_args=['-u'])
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168
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169 def test_buffering_stdout_ptys_unbuffered(self):
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170 self._test_buffering('stdout', _ptys, UNBUFFERED, python_args=['-u'])
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171
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172 if not pycompat.ispy3 and not pycompat.iswindows:
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173 # On Python 2 on non-Windows, we manually open stdout in line-buffered
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174 # mode if connected to a TTY. We should check if Python was configured
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175 # to use unbuffered stdout, but it's hard to do that.
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176 test_buffering_stdout_ptys_unbuffered = unittest.expectedFailure(
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177 test_buffering_stdout_ptys_unbuffered
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178 )
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179
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180 def _test_large_write(self, stream, rwpair_generator, python_args=[]):
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181 if not pycompat.ispy3 and pycompat.isdarwin:
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182 # Python 2 doesn't always retry on EINTR, but the libc might retry.
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183 # So far, it was observed only on macOS that EINTR is raised at the
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184 # Python level. As Python 2 support will be dropped soon-ish, we
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185 # won't attempt to fix it.
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186 raise unittest.SkipTest("raises EINTR on macOS")
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187
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188 def check_output(stream_receiver, proc):
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189 if not pycompat.iswindows:
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190 # On Unix, we can provoke a partial write() by interrupting it
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191 # by a signal handler as soon as a bit of data was written.
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192 # We test that write() is called until all data is written.
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193 buf = [os.read(stream_receiver, 1)]
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194 proc.send_signal(signal.SIGINT)
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195 else:
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196 # On Windows, there doesn't seem to be a way to cause partial
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197 # writes.
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198 buf = []
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199 self.assertEqual(
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200 _readall(stream_receiver, 131072, buf), b'x' * 1048576
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201 )
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202
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203 def post_child_check():
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204 with open(write_result_fn, 'r') as write_result_f:
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205 write_result_str = write_result_f.read()
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206 if pycompat.ispy3:
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207 # On Python 3, we test that the correct number of bytes is
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208 # claimed to have been written.
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209 expected_write_result_str = '1048576'
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210 else:
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211 # On Python 2, we only check that the large write does not
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212 # crash.
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213 expected_write_result_str = 'None'
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214 self.assertEqual(write_result_str, expected_write_result_str)
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215
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216 try:
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217 # tempfile.mktemp() is unsafe in general, as a malicious process
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218 # could create the file before we do. But in tests, we're running
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219 # in a controlled environment.
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220 write_result_fn = tempfile.mktemp()
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221 self._test(
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222 TEST_LARGE_WRITE_CHILD_SCRIPT.format(
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223 stream=stream, write_result_fn=repr(write_result_fn)
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224 ),
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225 stream,
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226 rwpair_generator,
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227 check_output,
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228 python_args,
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229 post_child_check=post_child_check,
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230 )
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231 finally:
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232 try:
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233 os.unlink(write_result_fn)
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234 except OSError:
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235 pass
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236
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237 def test_large_write_stdout_devnull(self):
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238 self._test_large_write('stdout', _devnull)
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239
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240 def test_large_write_stdout_pipes(self):
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241 self._test_large_write('stdout', _pipes)
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242
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243 def test_large_write_stdout_ptys(self):
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244 self._test_large_write('stdout', _ptys)
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245
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246 def test_large_write_stdout_devnull_unbuffered(self):
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247 self._test_large_write('stdout', _devnull, python_args=['-u'])
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248
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249 def test_large_write_stdout_pipes_unbuffered(self):
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250 self._test_large_write('stdout', _pipes, python_args=['-u'])
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251
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252 def test_large_write_stdout_ptys_unbuffered(self):
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253 self._test_large_write('stdout', _ptys, python_args=['-u'])
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254
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255 def test_large_write_stderr_devnull(self):
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256 self._test_large_write('stderr', _devnull)
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257
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258 def test_large_write_stderr_pipes(self):
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259 self._test_large_write('stderr', _pipes)
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260
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261 def test_large_write_stderr_ptys(self):
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262 self._test_large_write('stderr', _ptys)
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263
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264 def test_large_write_stderr_devnull_unbuffered(self):
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265 self._test_large_write('stderr', _devnull, python_args=['-u'])
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266
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267 def test_large_write_stderr_pipes_unbuffered(self):
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268 self._test_large_write('stderr', _pipes, python_args=['-u'])
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269
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270 def test_large_write_stderr_ptys_unbuffered(self):
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271 self._test_large_write('stderr', _ptys, python_args=['-u'])
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272
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273
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274 if __name__ == '__main__':
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275 import silenttestrunner
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276
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277 silenttestrunner.main(__name__)