Mercurial > hg
annotate tests/test-stdio.py @ 50916:98b8836d0e82
hgweb: use sysstr to set attribute on diff option
Attribute identifier should be `str` not `bytes`.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 01 Sep 2023 12:09:54 +0200 |
parents | 402f9f0f9387 |
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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 |
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6 import contextlib |
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7 import errno |
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8 import os |
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9 import pickle |
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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, util |
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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 os |
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38 import signal |
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39 import sys |
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40 |
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41 from mercurial import dispatch |
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42 from mercurial.utils import procutil |
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43 |
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44 signal.signal(signal.SIGINT, lambda *x: None) |
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45 dispatch.initstdio() |
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46 write_result = procutil.{stream}.write(b'x' * 1048576) |
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47 with os.fdopen( |
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48 os.open({write_result_fn!r}, os.O_WRONLY | getattr(os, 'O_TEMPORARY', 0)), |
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49 'w', |
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50 ) as write_result_f: |
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51 write_result_f.write(str(write_result)) |
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52 ''' |
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53 |
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54 |
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55 TEST_BROKEN_PIPE_CHILD_SCRIPT = r''' |
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56 import os |
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57 import pickle |
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58 |
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59 from mercurial import dispatch |
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60 from mercurial.utils import procutil |
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61 |
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62 dispatch.initstdio() |
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63 procutil.stdin.read(1) # wait until parent process closed pipe |
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64 try: |
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65 procutil.{stream}.write(b'test') |
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66 procutil.{stream}.flush() |
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67 except EnvironmentError as e: |
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68 with os.fdopen( |
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69 os.open( |
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70 {err_fn!r}, |
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71 os.O_WRONLY |
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72 | getattr(os, 'O_BINARY', 0) |
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73 | getattr(os, 'O_TEMPORARY', 0), |
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74 ), |
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75 'wb', |
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76 ) as err_f: |
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77 pickle.dump(e, err_f) |
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78 # Exit early to suppress further broken pipe errors at interpreter shutdown. |
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79 os._exit(0) |
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80 ''' |
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81 |
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82 |
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83 @contextlib.contextmanager |
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84 def _closing(fds): |
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85 try: |
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86 yield |
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87 finally: |
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88 for fd in fds: |
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89 try: |
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90 os.close(fd) |
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91 except EnvironmentError: |
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92 pass |
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93 |
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94 |
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95 # In the following, we set the FDs non-inheritable mainly to make it possible |
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96 # for tests to close the receiving end of the pipe / PTYs. |
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97 |
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98 |
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99 @contextlib.contextmanager |
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100 def _devnull(): |
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101 devnull = os.open(os.devnull, os.O_WRONLY) |
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102 # We don't have a receiving end, so it's not worth the effort on Python 2 |
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103 # on Windows to make the FD non-inheritable. |
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104 with _closing([devnull]): |
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105 yield (None, devnull) |
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106 |
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107 |
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108 @contextlib.contextmanager |
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109 def _pipes(): |
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110 rwpair = os.pipe() |
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111 with _closing(rwpair): |
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112 yield rwpair |
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113 |
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114 |
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115 @contextlib.contextmanager |
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116 def _ptys(): |
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117 if pycompat.iswindows: |
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118 raise unittest.SkipTest("PTYs are not supported on Windows") |
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119 import pty |
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120 import tty |
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121 |
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122 rwpair = pty.openpty() |
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123 with _closing(rwpair): |
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124 tty.setraw(rwpair[0]) |
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125 yield rwpair |
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126 |
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127 |
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128 def _readall(fd, buffer_size, initial_buf=None): |
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129 buf = initial_buf or [] |
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130 while True: |
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131 try: |
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132 s = os.read(fd, buffer_size) |
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133 except OSError as e: |
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134 if e.errno == errno.EIO: |
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135 # If the child-facing PTY got closed, reading from the |
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136 # parent-facing PTY raises EIO. |
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137 break |
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138 raise |
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139 if not s: |
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140 break |
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141 buf.append(s) |
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142 return b''.join(buf) |
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143 |
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144 |
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145 class TestStdio(unittest.TestCase): |
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146 def _test( |
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147 self, |
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148 child_script, |
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149 stream, |
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150 rwpair_generator, |
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151 check_output, |
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152 python_args=[], |
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153 post_child_check=None, |
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154 stdin_generator=None, |
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155 ): |
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156 assert stream in ('stdout', 'stderr') |
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157 if stdin_generator is None: |
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158 stdin_generator = open(os.devnull, 'rb') |
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159 with rwpair_generator() as ( |
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160 stream_receiver, |
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161 child_stream, |
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162 ), stdin_generator as child_stdin: |
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163 proc = subprocess.Popen( |
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164 [sys.executable] + python_args + ['-c', child_script], |
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165 stdin=child_stdin, |
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166 stdout=child_stream if stream == 'stdout' else None, |
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167 stderr=child_stream if stream == 'stderr' else None, |
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168 ) |
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169 try: |
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170 os.close(child_stream) |
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171 if stream_receiver is not None: |
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172 check_output(stream_receiver, proc) |
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173 except: # re-raises |
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174 proc.terminate() |
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175 raise |
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176 finally: |
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177 retcode = proc.wait() |
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178 self.assertEqual(retcode, 0) |
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179 if post_child_check is not None: |
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180 post_child_check() |
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181 |
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182 def _test_buffering( |
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183 self, stream, rwpair_generator, expected_output, python_args=[] |
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184 ): |
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185 def check_output(stream_receiver, proc): |
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186 self.assertEqual(_readall(stream_receiver, 1024), expected_output) |
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187 |
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188 self._test( |
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189 TEST_BUFFERING_CHILD_SCRIPT.format(stream=stream), |
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190 stream, |
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191 rwpair_generator, |
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192 check_output, |
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193 python_args, |
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194 ) |
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195 |
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196 def test_buffering_stdout_devnull(self): |
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197 self._test_buffering('stdout', _devnull, None) |
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198 |
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199 def test_buffering_stdout_pipes(self): |
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200 self._test_buffering('stdout', _pipes, FULLY_BUFFERED) |
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201 |
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202 def test_buffering_stdout_ptys(self): |
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203 self._test_buffering('stdout', _ptys, LINE_BUFFERED) |
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204 |
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205 def test_buffering_stdout_devnull_unbuffered(self): |
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206 self._test_buffering('stdout', _devnull, None, python_args=['-u']) |
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207 |
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208 def test_buffering_stdout_pipes_unbuffered(self): |
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209 self._test_buffering('stdout', _pipes, UNBUFFERED, python_args=['-u']) |
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210 |
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211 def test_buffering_stdout_ptys_unbuffered(self): |
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212 self._test_buffering('stdout', _ptys, UNBUFFERED, python_args=['-u']) |
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213 |
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214 def _test_large_write(self, stream, rwpair_generator, python_args=[]): |
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215 def check_output(stream_receiver, proc): |
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216 if not pycompat.iswindows: |
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217 # On Unix, we can provoke a partial write() by interrupting it |
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218 # by a signal handler as soon as a bit of data was written. |
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219 # We test that write() is called until all data is written. |
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220 buf = [os.read(stream_receiver, 1)] |
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221 proc.send_signal(signal.SIGINT) |
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222 else: |
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223 # On Windows, there doesn't seem to be a way to cause partial |
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224 # writes. |
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225 buf = [] |
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226 self.assertEqual( |
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227 _readall(stream_receiver, 131072, buf), b'x' * 1048576 |
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228 ) |
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229 |
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230 def post_child_check(): |
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231 self.assertEqual(write_result_f.read(), '1048576') |
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232 |
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233 with tempfile.NamedTemporaryFile('r') as write_result_f: |
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234 self._test( |
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235 TEST_LARGE_WRITE_CHILD_SCRIPT.format( |
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236 stream=stream, write_result_fn=write_result_f.name |
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237 ), |
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238 stream, |
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239 rwpair_generator, |
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240 check_output, |
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241 python_args, |
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242 post_child_check=post_child_check, |
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243 ) |
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244 |
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245 def test_large_write_stdout_devnull(self): |
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246 self._test_large_write('stdout', _devnull) |
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247 |
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248 def test_large_write_stdout_pipes(self): |
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249 self._test_large_write('stdout', _pipes) |
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250 |
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251 def test_large_write_stdout_ptys(self): |
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252 self._test_large_write('stdout', _ptys) |
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253 |
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254 def test_large_write_stdout_devnull_unbuffered(self): |
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255 self._test_large_write('stdout', _devnull, python_args=['-u']) |
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256 |
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257 def test_large_write_stdout_pipes_unbuffered(self): |
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258 self._test_large_write('stdout', _pipes, python_args=['-u']) |
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259 |
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260 def test_large_write_stdout_ptys_unbuffered(self): |
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261 self._test_large_write('stdout', _ptys, python_args=['-u']) |
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262 |
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263 def test_large_write_stderr_devnull(self): |
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264 self._test_large_write('stderr', _devnull) |
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265 |
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266 def test_large_write_stderr_pipes(self): |
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267 self._test_large_write('stderr', _pipes) |
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268 |
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269 def test_large_write_stderr_ptys(self): |
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270 self._test_large_write('stderr', _ptys) |
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271 |
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272 def test_large_write_stderr_devnull_unbuffered(self): |
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273 self._test_large_write('stderr', _devnull, python_args=['-u']) |
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274 |
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275 def test_large_write_stderr_pipes_unbuffered(self): |
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276 self._test_large_write('stderr', _pipes, python_args=['-u']) |
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277 |
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278 def test_large_write_stderr_ptys_unbuffered(self): |
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279 self._test_large_write('stderr', _ptys, python_args=['-u']) |
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280 |
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281 def _test_broken_pipe(self, stream): |
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282 assert stream in ('stdout', 'stderr') |
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283 |
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284 def check_output(stream_receiver, proc): |
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285 os.close(stream_receiver) |
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286 proc.stdin.write(b'x') |
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287 proc.stdin.close() |
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288 |
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289 def post_child_check(): |
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290 err = pickle.load(err_f) |
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291 self.assertEqual(err.errno, errno.EPIPE) |
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292 self.assertEqual(err.strerror, "Broken pipe") |
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293 |
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294 with tempfile.NamedTemporaryFile('rb') as err_f: |
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295 self._test( |
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296 TEST_BROKEN_PIPE_CHILD_SCRIPT.format( |
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297 stream=stream, err_fn=err_f.name |
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298 ), |
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299 stream, |
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300 _pipes, |
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301 check_output, |
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302 post_child_check=post_child_check, |
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303 stdin_generator=util.nullcontextmanager(subprocess.PIPE), |
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304 ) |
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305 |
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306 def test_broken_pipe_stdout(self): |
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307 self._test_broken_pipe('stdout') |
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308 |
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309 def test_broken_pipe_stderr(self): |
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310 self._test_broken_pipe('stderr') |
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311 |
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312 |
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313 if __name__ == '__main__': |
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314 import silenttestrunner |
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315 |
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316 silenttestrunner.main(__name__) |