Mercurial > hg
annotate tests/test-stdio.py @ 46858:85e3a630cad9
revlog: move the details of revlog "v2" index inside revlog.utils.constants
the revlog module is quite large and this kind of format information would handy
for other module. So let us start to gather this information about the format in
a more appropriate place.
We update various reference to this information to use the new "source of truth"
in the process.
Differential Revision: https://phab.mercurial-scm.org/D10305
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 05 Apr 2021 12:21:12 +0200 |
parents | c102b704edb5 |
children | 23f5ed6dbcb1 |
rev | line source |
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1 #!/usr/bin/env python3 |
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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, util |
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17 |
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18 |
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19 if pycompat.ispy3: |
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20 |
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21 def set_noninheritable(fd): |
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22 # On Python 3, file descriptors are non-inheritable by default. |
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23 pass |
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24 |
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25 |
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26 else: |
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27 if pycompat.iswindows: |
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28 # unused |
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29 set_noninheritable = None |
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30 else: |
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31 import fcntl |
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32 |
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33 def set_noninheritable(fd): |
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34 old = fcntl.fcntl(fd, fcntl.F_GETFD) |
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35 fcntl.fcntl(fd, fcntl.F_SETFD, old | fcntl.FD_CLOEXEC) |
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36 |
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37 |
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38 TEST_BUFFERING_CHILD_SCRIPT = r''' |
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39 import os |
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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 dispatch.initstdio() |
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45 procutil.{stream}.write(b'aaa') |
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46 os.write(procutil.{stream}.fileno(), b'[written aaa]') |
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47 procutil.{stream}.write(b'bbb\n') |
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48 os.write(procutil.{stream}.fileno(), b'[written bbb\\n]') |
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49 ''' |
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50 UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]' |
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51 LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]' |
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52 FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n' |
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53 |
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54 |
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55 TEST_LARGE_WRITE_CHILD_SCRIPT = r''' |
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56 import os |
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57 import signal |
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58 import sys |
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59 |
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60 from mercurial import dispatch |
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61 from mercurial.utils import procutil |
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62 |
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63 signal.signal(signal.SIGINT, lambda *x: None) |
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64 dispatch.initstdio() |
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65 write_result = procutil.{stream}.write(b'x' * 1048576) |
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66 with os.fdopen( |
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67 os.open({write_result_fn!r}, os.O_WRONLY | getattr(os, 'O_TEMPORARY', 0)), |
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68 'w', |
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69 ) as write_result_f: |
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70 write_result_f.write(str(write_result)) |
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71 ''' |
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72 |
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73 |
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74 TEST_BROKEN_PIPE_CHILD_SCRIPT = r''' |
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75 import os |
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76 import pickle |
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77 |
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78 from mercurial import dispatch |
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79 from mercurial.utils import procutil |
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80 |
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81 dispatch.initstdio() |
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82 procutil.stdin.read(1) # wait until parent process closed pipe |
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83 try: |
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84 procutil.{stream}.write(b'test') |
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85 procutil.{stream}.flush() |
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86 except EnvironmentError as e: |
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87 with os.fdopen( |
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88 os.open( |
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89 {err_fn!r}, |
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90 os.O_WRONLY |
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91 | getattr(os, 'O_BINARY', 0) |
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92 | getattr(os, 'O_TEMPORARY', 0), |
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93 ), |
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94 'wb', |
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95 ) as err_f: |
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96 pickle.dump(e, err_f) |
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97 # Exit early to suppress further broken pipe errors at interpreter shutdown. |
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98 os._exit(0) |
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99 ''' |
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100 |
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101 |
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102 @contextlib.contextmanager |
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103 def _closing(fds): |
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104 try: |
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105 yield |
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106 finally: |
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107 for fd in fds: |
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108 try: |
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109 os.close(fd) |
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110 except EnvironmentError: |
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111 pass |
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112 |
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113 |
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114 # In the following, we set the FDs non-inheritable mainly to make it possible |
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115 # for tests to close the receiving end of the pipe / PTYs. |
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116 |
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117 |
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118 @contextlib.contextmanager |
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119 def _devnull(): |
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120 devnull = os.open(os.devnull, os.O_WRONLY) |
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121 # We don't have a receiving end, so it's not worth the effort on Python 2 |
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122 # on Windows to make the FD non-inheritable. |
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123 with _closing([devnull]): |
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124 yield (None, devnull) |
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125 |
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126 |
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127 @contextlib.contextmanager |
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128 def _pipes(): |
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129 rwpair = os.pipe() |
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130 # Pipes are already non-inheritable on Windows. |
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131 if not pycompat.iswindows: |
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132 set_noninheritable(rwpair[0]) |
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133 set_noninheritable(rwpair[1]) |
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134 with _closing(rwpair): |
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135 yield rwpair |
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136 |
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137 |
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138 @contextlib.contextmanager |
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139 def _ptys(): |
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140 if pycompat.iswindows: |
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141 raise unittest.SkipTest("PTYs are not supported on Windows") |
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142 import pty |
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143 import tty |
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144 |
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145 rwpair = pty.openpty() |
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146 set_noninheritable(rwpair[0]) |
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147 set_noninheritable(rwpair[1]) |
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148 with _closing(rwpair): |
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149 tty.setraw(rwpair[0]) |
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150 yield rwpair |
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151 |
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152 |
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153 def _readall(fd, buffer_size, initial_buf=None): |
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154 buf = initial_buf or [] |
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155 while True: |
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156 try: |
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157 s = os.read(fd, buffer_size) |
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158 except OSError as e: |
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159 if e.errno == errno.EIO: |
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160 # If the child-facing PTY got closed, reading from the |
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161 # parent-facing PTY raises EIO. |
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162 break |
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163 raise |
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164 if not s: |
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165 break |
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166 buf.append(s) |
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167 return b''.join(buf) |
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168 |
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169 |
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170 class TestStdio(unittest.TestCase): |
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171 def _test( |
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172 self, |
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173 child_script, |
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174 stream, |
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175 rwpair_generator, |
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176 check_output, |
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177 python_args=[], |
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178 post_child_check=None, |
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179 stdin_generator=None, |
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180 ): |
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181 assert stream in ('stdout', 'stderr') |
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182 if stdin_generator is None: |
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183 stdin_generator = open(os.devnull, 'rb') |
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184 with rwpair_generator() as ( |
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185 stream_receiver, |
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186 child_stream, |
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187 ), stdin_generator as child_stdin: |
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188 proc = subprocess.Popen( |
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189 [sys.executable] + python_args + ['-c', child_script], |
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190 stdin=child_stdin, |
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191 stdout=child_stream if stream == 'stdout' else None, |
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192 stderr=child_stream if stream == 'stderr' else None, |
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193 ) |
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194 try: |
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195 os.close(child_stream) |
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196 if stream_receiver is not None: |
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197 check_output(stream_receiver, proc) |
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198 except: # re-raises |
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199 proc.terminate() |
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200 raise |
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201 finally: |
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202 retcode = proc.wait() |
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203 self.assertEqual(retcode, 0) |
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204 if post_child_check is not None: |
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205 post_child_check() |
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206 |
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207 def _test_buffering( |
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208 self, stream, rwpair_generator, expected_output, python_args=[] |
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209 ): |
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210 def check_output(stream_receiver, proc): |
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211 self.assertEqual(_readall(stream_receiver, 1024), expected_output) |
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212 |
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213 self._test( |
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214 TEST_BUFFERING_CHILD_SCRIPT.format(stream=stream), |
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215 stream, |
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216 rwpair_generator, |
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217 check_output, |
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218 python_args, |
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219 ) |
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220 |
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221 def test_buffering_stdout_devnull(self): |
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222 self._test_buffering('stdout', _devnull, None) |
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223 |
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224 def test_buffering_stdout_pipes(self): |
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225 self._test_buffering('stdout', _pipes, FULLY_BUFFERED) |
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226 |
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227 def test_buffering_stdout_ptys(self): |
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228 self._test_buffering('stdout', _ptys, LINE_BUFFERED) |
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229 |
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230 def test_buffering_stdout_devnull_unbuffered(self): |
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231 self._test_buffering('stdout', _devnull, None, python_args=['-u']) |
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232 |
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233 def test_buffering_stdout_pipes_unbuffered(self): |
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234 self._test_buffering('stdout', _pipes, UNBUFFERED, python_args=['-u']) |
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235 |
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236 def test_buffering_stdout_ptys_unbuffered(self): |
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237 self._test_buffering('stdout', _ptys, UNBUFFERED, python_args=['-u']) |
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238 |
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239 if not pycompat.ispy3 and not pycompat.iswindows: |
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240 # On Python 2 on non-Windows, we manually open stdout in line-buffered |
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241 # mode if connected to a TTY. We should check if Python was configured |
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242 # to use unbuffered stdout, but it's hard to do that. |
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243 test_buffering_stdout_ptys_unbuffered = unittest.expectedFailure( |
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244 test_buffering_stdout_ptys_unbuffered |
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245 ) |
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246 |
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247 def _test_large_write(self, stream, rwpair_generator, python_args=[]): |
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248 if not pycompat.ispy3 and pycompat.isdarwin: |
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249 # Python 2 doesn't always retry on EINTR, but the libc might retry. |
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250 # So far, it was observed only on macOS that EINTR is raised at the |
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251 # Python level. As Python 2 support will be dropped soon-ish, we |
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252 # won't attempt to fix it. |
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253 raise unittest.SkipTest("raises EINTR on macOS") |
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254 |
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255 def check_output(stream_receiver, proc): |
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256 if not pycompat.iswindows: |
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257 # On Unix, we can provoke a partial write() by interrupting it |
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258 # by a signal handler as soon as a bit of data was written. |
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259 # We test that write() is called until all data is written. |
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260 buf = [os.read(stream_receiver, 1)] |
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261 proc.send_signal(signal.SIGINT) |
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262 else: |
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263 # On Windows, there doesn't seem to be a way to cause partial |
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264 # writes. |
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265 buf = [] |
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266 self.assertEqual( |
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267 _readall(stream_receiver, 131072, buf), b'x' * 1048576 |
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268 ) |
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269 |
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270 def post_child_check(): |
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271 write_result_str = write_result_f.read() |
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272 if pycompat.ispy3: |
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273 # On Python 3, we test that the correct number of bytes is |
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274 # claimed to have been written. |
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275 expected_write_result_str = '1048576' |
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276 else: |
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277 # On Python 2, we only check that the large write does not |
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278 # crash. |
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279 expected_write_result_str = 'None' |
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280 self.assertEqual(write_result_str, expected_write_result_str) |
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281 |
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282 with tempfile.NamedTemporaryFile('r') as write_result_f: |
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283 self._test( |
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284 TEST_LARGE_WRITE_CHILD_SCRIPT.format( |
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285 stream=stream, write_result_fn=write_result_f.name |
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286 ), |
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287 stream, |
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288 rwpair_generator, |
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289 check_output, |
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290 python_args, |
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291 post_child_check=post_child_check, |
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292 ) |
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293 |
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294 def test_large_write_stdout_devnull(self): |
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295 self._test_large_write('stdout', _devnull) |
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296 |
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297 def test_large_write_stdout_pipes(self): |
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298 self._test_large_write('stdout', _pipes) |
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299 |
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300 def test_large_write_stdout_ptys(self): |
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301 self._test_large_write('stdout', _ptys) |
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302 |
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303 def test_large_write_stdout_devnull_unbuffered(self): |
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304 self._test_large_write('stdout', _devnull, python_args=['-u']) |
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305 |
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306 def test_large_write_stdout_pipes_unbuffered(self): |
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307 self._test_large_write('stdout', _pipes, python_args=['-u']) |
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308 |
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309 def test_large_write_stdout_ptys_unbuffered(self): |
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310 self._test_large_write('stdout', _ptys, python_args=['-u']) |
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311 |
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312 def test_large_write_stderr_devnull(self): |
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313 self._test_large_write('stderr', _devnull) |
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314 |
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315 def test_large_write_stderr_pipes(self): |
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316 self._test_large_write('stderr', _pipes) |
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317 |
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318 def test_large_write_stderr_ptys(self): |
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319 self._test_large_write('stderr', _ptys) |
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320 |
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321 def test_large_write_stderr_devnull_unbuffered(self): |
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322 self._test_large_write('stderr', _devnull, python_args=['-u']) |
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323 |
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324 def test_large_write_stderr_pipes_unbuffered(self): |
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325 self._test_large_write('stderr', _pipes, python_args=['-u']) |
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326 |
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327 def test_large_write_stderr_ptys_unbuffered(self): |
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328 self._test_large_write('stderr', _ptys, python_args=['-u']) |
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329 |
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330 def _test_broken_pipe(self, stream): |
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331 assert stream in ('stdout', 'stderr') |
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332 |
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333 def check_output(stream_receiver, proc): |
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334 os.close(stream_receiver) |
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335 proc.stdin.write(b'x') |
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336 proc.stdin.close() |
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337 |
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338 def post_child_check(): |
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339 err = util.pickle.load(err_f) |
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340 self.assertEqual(err.errno, errno.EPIPE) |
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341 self.assertEqual(err.strerror, "Broken pipe") |
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342 |
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343 with tempfile.NamedTemporaryFile('rb') as err_f: |
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344 self._test( |
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345 TEST_BROKEN_PIPE_CHILD_SCRIPT.format( |
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346 stream=stream, err_fn=err_f.name |
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347 ), |
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348 stream, |
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349 _pipes, |
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350 check_output, |
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351 post_child_check=post_child_check, |
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352 stdin_generator=util.nullcontextmanager(subprocess.PIPE), |
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353 ) |
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354 |
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355 def test_broken_pipe_stdout(self): |
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356 self._test_broken_pipe('stdout') |
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357 |
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358 def test_broken_pipe_stderr(self): |
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359 self._test_broken_pipe('stderr') |
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360 |
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361 |
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362 if __name__ == '__main__': |
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363 import silenttestrunner |
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364 |
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365 silenttestrunner.main(__name__) |