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annotate tests/test-stdio.py @ 45068:8cd18aba5e6c

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tests: proof test-stdio.py against buffer fill-up With the previous code, it could in theory happen that the pipe / PTY buffer of the child stdout / stderr fills up and the process never finishes. To prevent that, we read all of the stream before waiting for the end of the process. To ensure that the stream reaches EOF when the child finishes, we must close the parent "copy" of the child stdout / stderr.
author Manuel Jacob <me@manueljacob.de>
date Tue, 07 Jul 2020 11:06:37 +0200
parents 8403cc54bc83
children 9172fd511999
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 subprocess
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11 import sys
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12 import unittest
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13
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14 from mercurial import pycompat
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15
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16
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17 CHILD_PROCESS = r'''
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18 import os
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19
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20 from mercurial import dispatch
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21 from mercurial.utils import procutil
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22
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23 dispatch.initstdio()
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24 procutil.{stream}.write(b'aaa')
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25 os.write(procutil.{stream}.fileno(), b'[written aaa]')
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26 procutil.{stream}.write(b'bbb\n')
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27 os.write(procutil.{stream}.fileno(), b'[written bbb\\n]')
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28 '''
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29 UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]'
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30 LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]'
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31 FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n'
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32
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33
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34 @contextlib.contextmanager
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35 def _closing(fds):
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36 try:
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37 yield
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38 finally:
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39 for fd in fds:
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40 try:
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41 os.close(fd)
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42 except EnvironmentError:
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43 pass
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44
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45
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46 @contextlib.contextmanager
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47 def _pipes():
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48 rwpair = os.pipe()
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49 with _closing(rwpair):
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50 yield rwpair
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51
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52
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53 @contextlib.contextmanager
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54 def _ptys():
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55 if pycompat.iswindows:
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56 raise unittest.SkipTest("PTYs are not supported on Windows")
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57 import pty
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58 import tty
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59
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60 rwpair = pty.openpty()
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61 with _closing(rwpair):
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62 tty.setraw(rwpair[0])
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63 yield rwpair
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64
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65
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66 def _readall(fd, buffer_size):
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67 buf = []
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68 while True:
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69 try:
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70 s = os.read(fd, buffer_size)
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71 except OSError as e:
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72 if e.errno == errno.EIO:
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73 # If the child-facing PTY got closed, reading from the
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74 # parent-facing PTY raises EIO.
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75 break
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76 raise
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77 if not s:
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78 break
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79 buf.append(s)
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80 return b''.join(buf)
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81
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82
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83 class TestStdio(unittest.TestCase):
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84 def _test(self, stream, rwpair_generator, expected_output, python_args=[]):
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85 assert stream in ('stdout', 'stderr')
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86 with rwpair_generator() as (stream_receiver, child_stream), open(
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87 os.devnull, 'rb'
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88 ) as child_stdin:
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89 proc = subprocess.Popen(
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90 [sys.executable]
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91 + python_args
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92 + ['-c', CHILD_PROCESS.format(stream=stream)],
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93 stdin=child_stdin,
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94 stdout=child_stream if stream == 'stdout' else None,
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95 stderr=child_stream if stream == 'stderr' else None,
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96 )
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97 try:
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98 os.close(child_stream)
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99 self.assertEqual(
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100 _readall(stream_receiver, 1024), expected_output
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101 )
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102 finally:
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103 retcode = proc.wait()
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104 self.assertEqual(retcode, 0)
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105
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106 def test_stdout_pipes(self):
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107 self._test('stdout', _pipes, FULLY_BUFFERED)
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108
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109 def test_stdout_ptys(self):
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110 self._test('stdout', _ptys, LINE_BUFFERED)
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111
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112 def test_stdout_pipes_unbuffered(self):
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113 self._test('stdout', _pipes, UNBUFFERED, python_args=['-u'])
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114
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115 def test_stdout_ptys_unbuffered(self):
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116 self._test('stdout', _ptys, UNBUFFERED, python_args=['-u'])
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117
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118 if not pycompat.ispy3 and not pycompat.iswindows:
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119 # On Python 2 on non-Windows, we manually open stdout in line-buffered
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120 # mode if connected to a TTY. We should check if Python was configured
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121 # to use unbuffered stdout, but it's hard to do that.
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122 test_stdout_ptys_unbuffered = unittest.expectedFailure(
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123 test_stdout_ptys_unbuffered
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124 )
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125
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126 def test_stderr_pipes(self):
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127 self._test('stderr', _pipes, UNBUFFERED)
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128
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129 def test_stderr_ptys(self):
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130 self._test('stderr', _ptys, UNBUFFERED)
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131
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132 def test_stderr_pipes_unbuffered(self):
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133 self._test('stderr', _pipes, UNBUFFERED, python_args=['-u'])
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134
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135 def test_stderr_ptys_unbuffered(self):
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136 self._test('stderr', _ptys, UNBUFFERED, python_args=['-u'])
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137
45038
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138
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139 if __name__ == '__main__':
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140 import silenttestrunner
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141
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142 silenttestrunner.main(__name__)