Mercurial > hg
annotate tests/badserverext.py @ 46924:ca0049946e9a
split: avoid strip if split is a no-op (identical to original)
Differential Revision: https://phab.mercurial-scm.org/D10389
author | Kyle Lippincott <spectral@google.com> |
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date | Mon, 12 Apr 2021 19:25:34 -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', |
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48 b'closeafteraccept', |
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49 default=False, |
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50 ) |
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51 configitem( |
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52 b'badserver', |
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53 b'closeafterrecvbytes', |
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54 default=b'0', |
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55 ) |
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56 configitem( |
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57 b'badserver', |
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58 b'closeaftersendbytes', |
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59 default=b'0', |
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60 ) |
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61 configitem( |
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62 b'badserver', |
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63 b'closebeforeaccept', |
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64 default=False, |
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65 ) |
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66 |
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67 # We can't adjust __class__ on a socket instance. So we define a proxy type. |
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68 class socketproxy(object): |
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69 __slots__ = ( |
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70 '_orig', |
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71 '_logfp', |
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72 '_closeafterrecvbytes', |
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73 '_closeaftersendbytes', |
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74 ) |
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75 |
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76 def __init__( |
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77 self, obj, logfp, closeafterrecvbytes=0, closeaftersendbytes=0 |
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78 ): |
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79 object.__setattr__(self, '_orig', obj) |
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80 object.__setattr__(self, '_logfp', logfp) |
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81 object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) |
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82 object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) |
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83 |
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84 def __getattribute__(self, name): |
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85 if name in ('makefile', 'sendall', '_writelog'): |
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86 return object.__getattribute__(self, name) |
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87 |
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88 return getattr(object.__getattribute__(self, '_orig'), name) |
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89 |
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90 def __delattr__(self, name): |
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91 delattr(object.__getattribute__(self, '_orig'), name) |
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92 |
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93 def __setattr__(self, name, value): |
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94 setattr(object.__getattribute__(self, '_orig'), name, value) |
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95 |
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96 def _writelog(self, msg): |
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97 msg = msg.replace(b'\r', b'\\r').replace(b'\n', b'\\n') |
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98 |
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99 object.__getattribute__(self, '_logfp').write(msg) |
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100 object.__getattribute__(self, '_logfp').write(b'\n') |
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101 object.__getattribute__(self, '_logfp').flush() |
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102 |
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103 def makefile(self, mode, bufsize): |
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104 f = object.__getattribute__(self, '_orig').makefile(mode, bufsize) |
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105 |
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106 logfp = object.__getattribute__(self, '_logfp') |
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107 closeafterrecvbytes = object.__getattribute__( |
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108 self, '_closeafterrecvbytes' |
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109 ) |
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110 closeaftersendbytes = object.__getattribute__( |
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111 self, '_closeaftersendbytes' |
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112 ) |
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113 |
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114 return fileobjectproxy( |
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115 f, |
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116 logfp, |
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117 closeafterrecvbytes=closeafterrecvbytes, |
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118 closeaftersendbytes=closeaftersendbytes, |
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119 ) |
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120 |
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121 def sendall(self, data, flags=0): |
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122 remaining = object.__getattribute__(self, '_closeaftersendbytes') |
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123 |
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124 # No read limit. Call original function. |
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125 if not remaining: |
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126 result = object.__getattribute__(self, '_orig').sendall(data, flags) |
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127 self._writelog(b'sendall(%d) -> %s' % (len(data), data)) |
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128 return result |
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129 |
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130 if len(data) > remaining: |
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131 newdata = data[0:remaining] |
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132 else: |
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133 newdata = data |
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134 |
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135 remaining -= len(newdata) |
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136 |
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137 result = object.__getattribute__(self, '_orig').sendall(newdata, flags) |
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138 |
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139 self._writelog( |
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140 b'sendall(%d from %d) -> (%d) %s' |
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141 % (len(newdata), len(data), remaining, newdata) |
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142 ) |
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143 |
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144 object.__setattr__(self, '_closeaftersendbytes', remaining) |
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145 |
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146 if remaining <= 0: |
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147 self._writelog(b'write limit reached; closing socket') |
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148 object.__getattribute__(self, '_orig').shutdown(socket.SHUT_RDWR) |
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149 |
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150 raise Exception('connection closed after sending N bytes') |
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151 |
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152 return result |
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153 |
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154 |
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155 # We can't adjust __class__ on socket._fileobject, so define a proxy. |
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156 class fileobjectproxy(object): |
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157 __slots__ = ( |
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158 '_orig', |
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159 '_logfp', |
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160 '_closeafterrecvbytes', |
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161 '_closeaftersendbytes', |
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162 ) |
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163 |
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164 def __init__( |
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165 self, obj, logfp, closeafterrecvbytes=0, closeaftersendbytes=0 |
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166 ): |
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167 object.__setattr__(self, '_orig', obj) |
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168 object.__setattr__(self, '_logfp', logfp) |
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169 object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) |
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170 object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) |
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171 |
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172 def __getattribute__(self, name): |
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173 if name in ('_close', 'read', 'readline', 'write', '_writelog'): |
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174 return object.__getattribute__(self, name) |
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175 |
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176 return getattr(object.__getattribute__(self, '_orig'), name) |
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177 |
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178 def __delattr__(self, name): |
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179 delattr(object.__getattribute__(self, '_orig'), name) |
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180 |
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181 def __setattr__(self, name, value): |
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182 setattr(object.__getattribute__(self, '_orig'), name, value) |
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183 |
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184 def _writelog(self, msg): |
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185 msg = msg.replace(b'\r', b'\\r').replace(b'\n', b'\\n') |
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186 |
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187 object.__getattribute__(self, '_logfp').write(msg) |
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188 object.__getattribute__(self, '_logfp').write(b'\n') |
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189 object.__getattribute__(self, '_logfp').flush() |
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190 |
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191 def _close(self): |
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192 # Python 3 uses an io.BufferedIO instance. Python 2 uses some file |
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193 # object wrapper. |
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194 if pycompat.ispy3: |
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195 orig = object.__getattribute__(self, '_orig') |
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196 |
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197 if hasattr(orig, 'raw'): |
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198 orig.raw._sock.shutdown(socket.SHUT_RDWR) |
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199 else: |
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200 self.close() |
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201 else: |
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202 self._sock.shutdown(socket.SHUT_RDWR) |
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203 |
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204 def read(self, size=-1): |
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205 remaining = object.__getattribute__(self, '_closeafterrecvbytes') |
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206 |
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207 # No read limit. Call original function. |
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208 if not remaining: |
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209 result = object.__getattribute__(self, '_orig').read(size) |
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210 self._writelog( |
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211 b'read(%d) -> (%d) (%s) %s' % (size, len(result), result) |
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212 ) |
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213 return result |
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214 |
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215 origsize = size |
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216 |
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217 if size < 0: |
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218 size = remaining |
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219 else: |
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220 size = min(remaining, size) |
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221 |
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222 result = object.__getattribute__(self, '_orig').read(size) |
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223 remaining -= len(result) |
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224 |
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225 self._writelog( |
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226 b'read(%d from %d) -> (%d) %s' |
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227 % (size, origsize, len(result), result) |
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228 ) |
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229 |
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230 object.__setattr__(self, '_closeafterrecvbytes', remaining) |
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231 |
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232 if remaining <= 0: |
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233 self._writelog(b'read limit reached, closing socket') |
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234 self._close() |
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235 |
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236 # This is the easiest way to abort the current request. |
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237 raise Exception('connection closed after receiving N bytes') |
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238 |
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239 return result |
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240 |
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241 def readline(self, size=-1): |
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242 remaining = object.__getattribute__(self, '_closeafterrecvbytes') |
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243 |
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244 # No read limit. Call original function. |
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245 if not remaining: |
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246 result = object.__getattribute__(self, '_orig').readline(size) |
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247 self._writelog( |
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248 b'readline(%d) -> (%d) %s' % (size, len(result), result) |
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249 ) |
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250 return result |
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251 |
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252 origsize = size |
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253 |
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254 if size < 0: |
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255 size = remaining |
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256 else: |
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257 size = min(remaining, size) |
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258 |
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259 result = object.__getattribute__(self, '_orig').readline(size) |
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260 remaining -= len(result) |
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261 |
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262 self._writelog( |
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263 b'readline(%d from %d) -> (%d) %s' |
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264 % (size, origsize, len(result), result) |
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265 ) |
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266 |
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267 object.__setattr__(self, '_closeafterrecvbytes', remaining) |
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268 |
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269 if remaining <= 0: |
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270 self._writelog(b'read limit reached; closing socket') |
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271 self._close() |
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272 |
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273 # This is the easiest way to abort the current request. |
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274 raise Exception('connection closed after receiving N bytes') |
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275 |
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276 return result |
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277 |
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278 def write(self, data): |
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279 remaining = object.__getattribute__(self, '_closeaftersendbytes') |
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280 |
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281 # No byte limit on this operation. Call original function. |
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282 if not remaining: |
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283 self._writelog(b'write(%d) -> %s' % (len(data), data)) |
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284 result = object.__getattribute__(self, '_orig').write(data) |
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285 return result |
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286 |
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287 if len(data) > remaining: |
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288 newdata = data[0:remaining] |
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289 else: |
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290 newdata = data |
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291 |
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292 remaining -= len(newdata) |
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293 |
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294 self._writelog( |
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295 b'write(%d from %d) -> (%d) %s' |
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296 % (len(newdata), len(data), remaining, newdata) |
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297 ) |
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298 |
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299 result = object.__getattribute__(self, '_orig').write(newdata) |
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300 |
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301 object.__setattr__(self, '_closeaftersendbytes', remaining) |
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302 |
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303 if remaining <= 0: |
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304 self._writelog(b'write limit reached; closing socket') |
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305 self._close() |
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306 |
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307 raise Exception('connection closed after sending N bytes') |
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308 |
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309 return result |
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310 |
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311 |
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312 def extsetup(ui): |
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313 # Change the base HTTP server class so various events can be performed. |
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314 # See SocketServer.BaseServer for how the specially named methods work. |
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315 class badserver(server.MercurialHTTPServer): |
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316 def __init__(self, ui, *args, **kwargs): |
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317 self._ui = ui |
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318 super(badserver, self).__init__(ui, *args, **kwargs) |
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319 |
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320 recvbytes = self._ui.config(b'badserver', b'closeafterrecvbytes') |
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321 recvbytes = recvbytes.split(b',') |
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322 self.closeafterrecvbytes = [int(v) for v in recvbytes if v] |
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323 sendbytes = self._ui.config(b'badserver', b'closeaftersendbytes') |
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324 sendbytes = sendbytes.split(b',') |
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325 self.closeaftersendbytes = [int(v) for v in sendbytes if v] |
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326 |
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327 # Need to inherit object so super() works. |
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328 class badrequesthandler(self.RequestHandlerClass, object): |
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329 def send_header(self, name, value): |
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330 # Make headers deterministic to facilitate testing. |
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331 if name.lower() == 'date': |
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332 value = 'Fri, 14 Apr 2017 00:00:00 GMT' |
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333 elif name.lower() == 'server': |
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334 value = 'badhttpserver' |
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335 |
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336 return super(badrequesthandler, self).send_header( |
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337 name, value |
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338 ) |
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339 |
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340 self.RequestHandlerClass = badrequesthandler |
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341 |
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342 # Called to accept() a pending socket. |
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343 def get_request(self): |
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344 if self._ui.configbool(b'badserver', b'closebeforeaccept'): |
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345 self.socket.close() |
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346 |
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347 # Tells the server to stop processing more requests. |
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348 self.__shutdown_request = True |
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349 |
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350 # Simulate failure to stop processing this request. |
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351 raise socket.error('close before accept') |
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352 |
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353 if self._ui.configbool(b'badserver', b'closeafteraccept'): |
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354 request, client_address = super(badserver, self).get_request() |
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355 request.close() |
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356 raise socket.error('close after accept') |
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357 |
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358 return super(badserver, self).get_request() |
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359 |
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360 # Does heavy lifting of processing a request. Invokes |
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361 # self.finish_request() which calls self.RequestHandlerClass() which |
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362 # is a hgweb.server._httprequesthandler. |
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363 def process_request(self, socket, address): |
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364 # Wrap socket in a proxy if we need to count bytes. |
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365 if self.closeafterrecvbytes: |
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366 closeafterrecvbytes = self.closeafterrecvbytes.pop(0) |
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367 else: |
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368 closeafterrecvbytes = 0 |
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369 if self.closeaftersendbytes: |
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370 closeaftersendbytes = self.closeaftersendbytes.pop(0) |
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371 else: |
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372 closeaftersendbytes = 0 |
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373 |
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374 if closeafterrecvbytes or closeaftersendbytes: |
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375 socket = socketproxy( |
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376 socket, |
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377 self.errorlog, |
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378 closeafterrecvbytes=closeafterrecvbytes, |
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379 closeaftersendbytes=closeaftersendbytes, |
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380 ) |
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381 |
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382 return super(badserver, self).process_request(socket, address) |
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383 |
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384 server.MercurialHTTPServer = badserver |