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