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@@ -1,119 +1,142 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 | import errno | |
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8 | 9 | import os |
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9 | 10 | import subprocess |
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10 | 11 | import sys |
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11 | 12 | import unittest |
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12 | 13 | |
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13 | 14 | from mercurial import pycompat |
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14 | 15 | |
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15 | 16 | |
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16 | 17 | CHILD_PROCESS = r''' |
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17 | 18 | import os |
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18 | 19 | |
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19 | 20 | from mercurial import dispatch |
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20 | 21 | from mercurial.utils import procutil |
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21 | 22 | |
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22 | 23 | dispatch.initstdio() |
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23 | 24 | procutil.{stream}.write(b'aaa') |
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24 | 25 | os.write(procutil.{stream}.fileno(), b'[written aaa]') |
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25 | 26 | procutil.{stream}.write(b'bbb\n') |
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26 | 27 | os.write(procutil.{stream}.fileno(), b'[written bbb\\n]') |
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27 | 28 | ''' |
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28 | 29 | UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]' |
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29 | 30 | LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]' |
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30 | 31 | FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n' |
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31 | 32 | |
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32 | 33 | |
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33 | 34 | @contextlib.contextmanager |
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34 | 35 | def _closing(fds): |
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35 | 36 | try: |
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36 | 37 | yield |
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37 | 38 | finally: |
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38 | 39 | for fd in fds: |
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39 | 40 | try: |
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40 | 41 | os.close(fd) |
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41 | 42 | except EnvironmentError: |
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42 | 43 | pass |
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43 | 44 | |
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44 | 45 | |
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45 | 46 | @contextlib.contextmanager |
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46 | 47 | def _pipes(): |
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47 | 48 | rwpair = os.pipe() |
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48 | 49 | with _closing(rwpair): |
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49 | 50 | yield rwpair |
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50 | 51 | |
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51 | 52 | |
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52 | 53 | @contextlib.contextmanager |
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53 | 54 | def _ptys(): |
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54 | 55 | if pycompat.iswindows: |
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55 | 56 | raise unittest.SkipTest("PTYs are not supported on Windows") |
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56 | 57 | import pty |
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57 | 58 | import tty |
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58 | 59 | |
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59 | 60 | rwpair = pty.openpty() |
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60 | 61 | with _closing(rwpair): |
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61 | 62 | tty.setraw(rwpair[0]) |
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62 | 63 | yield rwpair |
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63 | 64 | |
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64 | 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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65 | 83 | class TestStdio(unittest.TestCase): |
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66 | 84 | def _test(self, stream, rwpair_generator, expected_output, python_args=[]): |
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67 | 85 | assert stream in ('stdout', 'stderr') |
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68 | 86 | with rwpair_generator() as (stream_receiver, child_stream), open( |
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69 | 87 | os.devnull, 'rb' |
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70 | 88 | ) as child_stdin: |
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71 | 89 | proc = subprocess.Popen( |
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72 | 90 | [sys.executable] |
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73 | 91 | + python_args |
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74 | 92 | + ['-c', CHILD_PROCESS.format(stream=stream)], |
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75 | 93 | stdin=child_stdin, |
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76 | 94 | stdout=child_stream if stream == 'stdout' else None, |
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77 | 95 | stderr=child_stream if stream == 'stderr' else None, |
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78 | 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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79 | 103 | retcode = proc.wait() |
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80 | 104 | self.assertEqual(retcode, 0) |
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81 | self.assertEqual(os.read(stream_receiver, 1024), expected_output) | |
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82 | 105 | |
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83 | 106 | def test_stdout_pipes(self): |
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84 | 107 | self._test('stdout', _pipes, FULLY_BUFFERED) |
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85 | 108 | |
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86 | 109 | def test_stdout_ptys(self): |
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87 | 110 | self._test('stdout', _ptys, LINE_BUFFERED) |
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88 | 111 | |
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89 | 112 | def test_stdout_pipes_unbuffered(self): |
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90 | 113 | self._test('stdout', _pipes, UNBUFFERED, python_args=['-u']) |
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91 | 114 | |
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92 | 115 | def test_stdout_ptys_unbuffered(self): |
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93 | 116 | self._test('stdout', _ptys, UNBUFFERED, python_args=['-u']) |
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94 | 117 | |
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95 | 118 | if not pycompat.ispy3 and not pycompat.iswindows: |
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96 | 119 | # On Python 2 on non-Windows, we manually open stdout in line-buffered |
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97 | 120 | # mode if connected to a TTY. We should check if Python was configured |
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98 | 121 | # to use unbuffered stdout, but it's hard to do that. |
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99 | 122 | test_stdout_ptys_unbuffered = unittest.expectedFailure( |
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100 | 123 | test_stdout_ptys_unbuffered |
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101 | 124 | ) |
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102 | 125 | |
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103 | 126 | def test_stderr_pipes(self): |
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104 | 127 | self._test('stderr', _pipes, UNBUFFERED) |
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105 | 128 | |
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106 | 129 | def test_stderr_ptys(self): |
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107 | 130 | self._test('stderr', _ptys, UNBUFFERED) |
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108 | 131 | |
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109 | 132 | def test_stderr_pipes_unbuffered(self): |
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110 | 133 | self._test('stderr', _pipes, UNBUFFERED, python_args=['-u']) |
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111 | 134 | |
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112 | 135 | def test_stderr_ptys_unbuffered(self): |
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113 | 136 | self._test('stderr', _ptys, UNBUFFERED, python_args=['-u']) |
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114 | 137 | |
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115 | 138 | |
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116 | 139 | if __name__ == '__main__': |
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117 | 140 | import silenttestrunner |
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118 | 141 | |
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119 | 142 | silenttestrunner.main(__name__) |
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