Mercurial > hg
annotate tests/badserverext.py @ 45841:bff719525815
errors: set detailed exit code to 30 for config errors
This is per https://www.mercurial-scm.org/wiki/ErrorCategoriesPlan.
Differential Revision: https://phab.mercurial-scm.org/D9311
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Thu, 22 Oct 2020 13:56:01 -0700 |
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1 # badserverext.py - Extension making servers behave badly |
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2 # |
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3 # Copyright 2017 Gregory Szorc <gregory.szorc@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 # no-check-code |
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9 |
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10 """Extension to make servers behave badly. |
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11 |
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12 This extension is useful for testing Mercurial behavior when various network |
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13 events occur. |
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14 |
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15 Various config options in the [badserver] section influence behavior: |
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16 |
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17 closebeforeaccept |
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18 If true, close() the server socket when a new connection arrives before |
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19 accept() is called. The server will then exit. |
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20 |
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21 closeafteraccept |
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22 If true, the server will close() the client socket immediately after |
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23 accept(). |
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24 |
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25 closeafterrecvbytes |
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26 If defined, close the client socket after receiving this many bytes. |
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27 |
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28 closeaftersendbytes |
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29 If defined, close the client socket after sending this many bytes. |
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30 """ |
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31 |
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32 from __future__ import absolute_import |
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33 |
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34 import socket |
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35 |
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36 from mercurial import ( |
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37 pycompat, |
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38 registrar, |
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39 ) |
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40 |
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41 from mercurial.hgweb import server |
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42 |
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43 configtable = {} |
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44 configitem = registrar.configitem(configtable) |
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45 |
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46 configitem( |
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47 b'badserver', b'closeafteraccept', default=False, |
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48 ) |
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49 configitem( |
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50 b'badserver', b'closeafterrecvbytes', default=b'0', |
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51 ) |
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52 configitem( |
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53 b'badserver', b'closeaftersendbytes', default=b'0', |
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54 ) |
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55 configitem( |
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56 b'badserver', b'closebeforeaccept', default=False, |
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57 ) |
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58 |
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59 # We can't adjust __class__ on a socket instance. So we define a proxy type. |
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60 class socketproxy(object): |
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61 __slots__ = ( |
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62 '_orig', |
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63 '_logfp', |
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64 '_closeafterrecvbytes', |
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65 '_closeaftersendbytes', |
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66 ) |
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67 |
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68 def __init__( |
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69 self, obj, logfp, closeafterrecvbytes=0, closeaftersendbytes=0 |
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70 ): |
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71 object.__setattr__(self, '_orig', obj) |
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72 object.__setattr__(self, '_logfp', logfp) |
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73 object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) |
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74 object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) |
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75 |
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76 def __getattribute__(self, name): |
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77 if name in ('makefile', 'sendall', '_writelog'): |
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78 return object.__getattribute__(self, name) |
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79 |
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80 return getattr(object.__getattribute__(self, '_orig'), name) |
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81 |
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82 def __delattr__(self, name): |
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83 delattr(object.__getattribute__(self, '_orig'), name) |
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84 |
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85 def __setattr__(self, name, value): |
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86 setattr(object.__getattribute__(self, '_orig'), name, value) |
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87 |
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88 def _writelog(self, msg): |
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89 msg = msg.replace(b'\r', b'\\r').replace(b'\n', b'\\n') |
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90 |
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91 object.__getattribute__(self, '_logfp').write(msg) |
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92 object.__getattribute__(self, '_logfp').write(b'\n') |
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93 object.__getattribute__(self, '_logfp').flush() |
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94 |
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95 def makefile(self, mode, bufsize): |
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96 f = object.__getattribute__(self, '_orig').makefile(mode, bufsize) |
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97 |
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98 logfp = object.__getattribute__(self, '_logfp') |
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99 closeafterrecvbytes = object.__getattribute__( |
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100 self, '_closeafterrecvbytes' |
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101 ) |
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102 closeaftersendbytes = object.__getattribute__( |
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103 self, '_closeaftersendbytes' |
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104 ) |
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105 |
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106 return fileobjectproxy( |
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107 f, |
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108 logfp, |
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109 closeafterrecvbytes=closeafterrecvbytes, |
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110 closeaftersendbytes=closeaftersendbytes, |
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111 ) |
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112 |
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113 def sendall(self, data, flags=0): |
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114 remaining = object.__getattribute__(self, '_closeaftersendbytes') |
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115 |
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116 # No read limit. Call original function. |
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117 if not remaining: |
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118 result = object.__getattribute__(self, '_orig').sendall(data, flags) |
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119 self._writelog(b'sendall(%d) -> %s' % (len(data), data)) |
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120 return result |
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121 |
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122 if len(data) > remaining: |
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123 newdata = data[0:remaining] |
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124 else: |
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125 newdata = data |
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126 |
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127 remaining -= len(newdata) |
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128 |
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129 result = object.__getattribute__(self, '_orig').sendall(newdata, flags) |
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130 |
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131 self._writelog( |
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132 b'sendall(%d from %d) -> (%d) %s' |
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133 % (len(newdata), len(data), remaining, newdata) |
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134 ) |
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135 |
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136 object.__setattr__(self, '_closeaftersendbytes', remaining) |
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137 |
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138 if remaining <= 0: |
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139 self._writelog(b'write limit reached; closing socket') |
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140 object.__getattribute__(self, '_orig').shutdown(socket.SHUT_RDWR) |
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141 |
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142 raise Exception('connection closed after sending N bytes') |
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143 |
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144 return result |
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145 |
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146 |
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147 # We can't adjust __class__ on socket._fileobject, so define a proxy. |
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148 class fileobjectproxy(object): |
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149 __slots__ = ( |
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150 '_orig', |
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151 '_logfp', |
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152 '_closeafterrecvbytes', |
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153 '_closeaftersendbytes', |
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154 ) |
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155 |
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156 def __init__( |
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157 self, obj, logfp, closeafterrecvbytes=0, closeaftersendbytes=0 |
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158 ): |
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159 object.__setattr__(self, '_orig', obj) |
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160 object.__setattr__(self, '_logfp', logfp) |
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161 object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) |
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162 object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) |
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163 |
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164 def __getattribute__(self, name): |
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165 if name in ('_close', 'read', 'readline', 'write', '_writelog'): |
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166 return object.__getattribute__(self, name) |
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167 |
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168 return getattr(object.__getattribute__(self, '_orig'), name) |
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169 |
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170 def __delattr__(self, name): |
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171 delattr(object.__getattribute__(self, '_orig'), name) |
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172 |
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173 def __setattr__(self, name, value): |
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174 setattr(object.__getattribute__(self, '_orig'), name, value) |
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175 |
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176 def _writelog(self, msg): |
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177 msg = msg.replace(b'\r', b'\\r').replace(b'\n', b'\\n') |
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178 |
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179 object.__getattribute__(self, '_logfp').write(msg) |
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180 object.__getattribute__(self, '_logfp').write(b'\n') |
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181 object.__getattribute__(self, '_logfp').flush() |
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182 |
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183 def _close(self): |
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184 # Python 3 uses an io.BufferedIO instance. Python 2 uses some file |
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185 # object wrapper. |
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186 if pycompat.ispy3: |
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187 orig = object.__getattribute__(self, '_orig') |
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188 |
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189 if hasattr(orig, 'raw'): |
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190 orig.raw._sock.shutdown(socket.SHUT_RDWR) |
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191 else: |
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192 self.close() |
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193 else: |
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194 self._sock.shutdown(socket.SHUT_RDWR) |
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195 |
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196 def read(self, size=-1): |
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197 remaining = object.__getattribute__(self, '_closeafterrecvbytes') |
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198 |
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199 # No read limit. Call original function. |
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200 if not remaining: |
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201 result = object.__getattribute__(self, '_orig').read(size) |
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202 self._writelog( |
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203 b'read(%d) -> (%d) (%s) %s' % (size, len(result), result) |
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204 ) |
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205 return result |
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206 |
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207 origsize = size |
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208 |
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209 if size < 0: |
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210 size = remaining |
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211 else: |
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212 size = min(remaining, size) |
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213 |
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214 result = object.__getattribute__(self, '_orig').read(size) |
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215 remaining -= len(result) |
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216 |
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217 self._writelog( |
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218 b'read(%d from %d) -> (%d) %s' |
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219 % (size, origsize, len(result), result) |
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220 ) |
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221 |
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222 object.__setattr__(self, '_closeafterrecvbytes', remaining) |
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223 |
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224 if remaining <= 0: |
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225 self._writelog(b'read limit reached, closing socket') |
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226 self._close() |
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227 |
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228 # This is the easiest way to abort the current request. |
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229 raise Exception('connection closed after receiving N bytes') |
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230 |
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231 return result |
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232 |
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233 def readline(self, size=-1): |
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234 remaining = object.__getattribute__(self, '_closeafterrecvbytes') |
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235 |
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236 # No read limit. Call original function. |
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237 if not remaining: |
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238 result = object.__getattribute__(self, '_orig').readline(size) |
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239 self._writelog( |
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240 b'readline(%d) -> (%d) %s' % (size, len(result), result) |
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241 ) |
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242 return result |
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243 |
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244 origsize = size |
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245 |
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246 if size < 0: |
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247 size = remaining |
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248 else: |
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249 size = min(remaining, size) |
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250 |
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251 result = object.__getattribute__(self, '_orig').readline(size) |
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252 remaining -= len(result) |
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253 |
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254 self._writelog( |
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255 b'readline(%d from %d) -> (%d) %s' |
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256 % (size, origsize, len(result), result) |
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257 ) |
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258 |
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259 object.__setattr__(self, '_closeafterrecvbytes', remaining) |
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260 |
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261 if remaining <= 0: |
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262 self._writelog(b'read limit reached; closing socket') |
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263 self._close() |
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264 |
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265 # This is the easiest way to abort the current request. |
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266 raise Exception('connection closed after receiving N bytes') |
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267 |
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268 return result |
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269 |
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270 def write(self, data): |
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271 remaining = object.__getattribute__(self, '_closeaftersendbytes') |
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272 |
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273 # No byte limit on this operation. Call original function. |
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274 if not remaining: |
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275 self._writelog(b'write(%d) -> %s' % (len(data), data)) |
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276 result = object.__getattribute__(self, '_orig').write(data) |
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277 return result |
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278 |
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279 if len(data) > remaining: |
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280 newdata = data[0:remaining] |
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281 else: |
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282 newdata = data |
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283 |
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284 remaining -= len(newdata) |
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285 |
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286 self._writelog( |
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287 b'write(%d from %d) -> (%d) %s' |
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288 % (len(newdata), len(data), remaining, newdata) |
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289 ) |
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290 |
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291 result = object.__getattribute__(self, '_orig').write(newdata) |
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292 |
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293 object.__setattr__(self, '_closeaftersendbytes', remaining) |
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294 |
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295 if remaining <= 0: |
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296 self._writelog(b'write limit reached; closing socket') |
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297 self._close() |
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298 |
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299 raise Exception('connection closed after sending N bytes') |
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300 |
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301 return result |
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302 |
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303 |
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304 def extsetup(ui): |
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305 # Change the base HTTP server class so various events can be performed. |
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306 # See SocketServer.BaseServer for how the specially named methods work. |
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307 class badserver(server.MercurialHTTPServer): |
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308 def __init__(self, ui, *args, **kwargs): |
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309 self._ui = ui |
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310 super(badserver, self).__init__(ui, *args, **kwargs) |
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311 |
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312 recvbytes = self._ui.config(b'badserver', b'closeafterrecvbytes') |
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313 recvbytes = recvbytes.split(b',') |
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314 self.closeafterrecvbytes = [int(v) for v in recvbytes if v] |
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315 sendbytes = self._ui.config(b'badserver', b'closeaftersendbytes') |
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316 sendbytes = sendbytes.split(b',') |
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317 self.closeaftersendbytes = [int(v) for v in sendbytes if v] |
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318 |
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319 # Need to inherit object so super() works. |
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320 class badrequesthandler(self.RequestHandlerClass, object): |
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321 def send_header(self, name, value): |
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322 # Make headers deterministic to facilitate testing. |
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323 if name.lower() == 'date': |
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324 value = 'Fri, 14 Apr 2017 00:00:00 GMT' |
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325 elif name.lower() == 'server': |
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326 value = 'badhttpserver' |
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327 |
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328 return super(badrequesthandler, self).send_header( |
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329 name, value |
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330 ) |
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331 |
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332 self.RequestHandlerClass = badrequesthandler |
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333 |
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334 # Called to accept() a pending socket. |
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335 def get_request(self): |
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336 if self._ui.configbool(b'badserver', b'closebeforeaccept'): |
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337 self.socket.close() |
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338 |
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339 # Tells the server to stop processing more requests. |
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340 self.__shutdown_request = True |
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341 |
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342 # Simulate failure to stop processing this request. |
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343 raise socket.error('close before accept') |
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344 |
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345 if self._ui.configbool(b'badserver', b'closeafteraccept'): |
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346 request, client_address = super(badserver, self).get_request() |
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347 request.close() |
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348 raise socket.error('close after accept') |
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349 |
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350 return super(badserver, self).get_request() |
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351 |
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352 # Does heavy lifting of processing a request. Invokes |
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353 # self.finish_request() which calls self.RequestHandlerClass() which |
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354 # is a hgweb.server._httprequesthandler. |
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355 def process_request(self, socket, address): |
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356 # Wrap socket in a proxy if we need to count bytes. |
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357 if self.closeafterrecvbytes: |
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358 closeafterrecvbytes = self.closeafterrecvbytes.pop(0) |
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359 else: |
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360 closeafterrecvbytes = 0 |
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361 if self.closeaftersendbytes: |
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362 closeaftersendbytes = self.closeaftersendbytes.pop(0) |
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363 else: |
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364 closeaftersendbytes = 0 |
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365 |
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366 if closeafterrecvbytes or closeaftersendbytes: |
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367 socket = socketproxy( |
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368 socket, |
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369 self.errorlog, |
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370 closeafterrecvbytes=closeafterrecvbytes, |
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371 closeaftersendbytes=closeaftersendbytes, |
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372 ) |
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373 |
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374 return super(badserver, self).process_request(socket, address) |
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375 |
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376 server.MercurialHTTPServer = badserver |