Mercurial > hg
annotate tests/badserverext.py @ 33192:c538fca0d511
configitems: register the 'badserver.closeafterrecvbytes' config
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 30 Jun 2017 03:27:44 +0200 |
parents | 8065b4ab0ed7 |
children | cbb50fd830ea |
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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 registrar, |
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38 ) |
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39 |
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40 from mercurial.hgweb import ( |
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41 server, |
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42 ) |
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43 |
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44 configtable = {} |
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45 configitem = registrar.configitem(configtable) |
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46 |
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47 configitem('badserver', 'closeafteraccept', |
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48 default=False, |
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49 ) |
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50 configitem('badserver', 'closeafterrecvbytes', |
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51 default=0, |
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52 ) |
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53 |
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54 # We can't adjust __class__ on a socket instance. So we define a proxy type. |
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55 class socketproxy(object): |
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56 __slots__ = ( |
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57 '_orig', |
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58 '_logfp', |
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59 '_closeafterrecvbytes', |
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60 '_closeaftersendbytes', |
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61 ) |
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62 |
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63 def __init__(self, obj, logfp, closeafterrecvbytes=0, |
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64 closeaftersendbytes=0): |
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65 object.__setattr__(self, '_orig', obj) |
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66 object.__setattr__(self, '_logfp', logfp) |
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67 object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) |
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68 object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) |
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69 |
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70 def __getattribute__(self, name): |
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71 if name in ('makefile',): |
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72 return object.__getattribute__(self, name) |
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73 |
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74 return getattr(object.__getattribute__(self, '_orig'), name) |
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75 |
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76 def __delattr__(self, name): |
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77 delattr(object.__getattribute__(self, '_orig'), name) |
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78 |
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79 def __setattr__(self, name, value): |
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80 setattr(object.__getattribute__(self, '_orig'), name, value) |
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81 |
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82 def makefile(self, mode, bufsize): |
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83 f = object.__getattribute__(self, '_orig').makefile(mode, bufsize) |
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84 |
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85 logfp = object.__getattribute__(self, '_logfp') |
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86 closeafterrecvbytes = object.__getattribute__(self, |
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87 '_closeafterrecvbytes') |
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88 closeaftersendbytes = object.__getattribute__(self, |
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89 '_closeaftersendbytes') |
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90 |
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91 return fileobjectproxy(f, logfp, |
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92 closeafterrecvbytes=closeafterrecvbytes, |
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93 closeaftersendbytes=closeaftersendbytes) |
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94 |
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95 # We can't adjust __class__ on socket._fileobject, so define a proxy. |
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96 class fileobjectproxy(object): |
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97 __slots__ = ( |
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98 '_orig', |
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99 '_logfp', |
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100 '_closeafterrecvbytes', |
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101 '_closeaftersendbytes', |
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102 ) |
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103 |
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104 def __init__(self, obj, logfp, closeafterrecvbytes=0, |
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105 closeaftersendbytes=0): |
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106 object.__setattr__(self, '_orig', obj) |
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107 object.__setattr__(self, '_logfp', logfp) |
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108 object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes) |
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109 object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes) |
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110 |
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111 def __getattribute__(self, name): |
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112 if name in ('read', 'readline', 'write', '_writelog'): |
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113 return object.__getattribute__(self, name) |
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114 |
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115 return getattr(object.__getattribute__(self, '_orig'), name) |
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116 |
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117 def __delattr__(self, name): |
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118 delattr(object.__getattribute__(self, '_orig'), name) |
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119 |
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120 def __setattr__(self, name, value): |
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121 setattr(object.__getattribute__(self, '_orig'), name, value) |
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122 |
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123 def _writelog(self, msg): |
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124 msg = msg.replace('\r', '\\r').replace('\n', '\\n') |
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125 |
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126 object.__getattribute__(self, '_logfp').write(msg) |
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127 object.__getattribute__(self, '_logfp').write('\n') |
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128 object.__getattribute__(self, '_logfp').flush() |
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129 |
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130 def read(self, size=-1): |
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131 remaining = object.__getattribute__(self, '_closeafterrecvbytes') |
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132 |
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133 # No read limit. Call original function. |
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134 if not remaining: |
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135 result = object.__getattribute__(self, '_orig').read(size) |
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136 self._writelog('read(%d) -> (%d) (%s) %s' % (size, |
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137 len(result), |
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138 result)) |
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139 return result |
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140 |
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141 origsize = size |
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142 |
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143 if size < 0: |
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144 size = remaining |
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145 else: |
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146 size = min(remaining, size) |
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147 |
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148 result = object.__getattribute__(self, '_orig').read(size) |
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149 remaining -= len(result) |
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150 |
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151 self._writelog('read(%d from %d) -> (%d) %s' % ( |
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152 size, origsize, len(result), result)) |
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153 |
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154 object.__setattr__(self, '_closeafterrecvbytes', remaining) |
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155 |
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156 if remaining <= 0: |
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157 self._writelog('read limit reached, closing socket') |
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158 self._sock.close() |
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159 # This is the easiest way to abort the current request. |
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160 raise Exception('connection closed after receiving N bytes') |
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161 |
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162 return result |
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163 |
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164 def readline(self, size=-1): |
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165 remaining = object.__getattribute__(self, '_closeafterrecvbytes') |
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166 |
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167 # No read limit. Call original function. |
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168 if not remaining: |
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169 result = object.__getattribute__(self, '_orig').readline(size) |
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170 self._writelog('readline(%d) -> (%d) %s' % ( |
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171 size, len(result), result)) |
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172 return result |
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173 |
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174 origsize = size |
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175 |
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176 if size < 0: |
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177 size = remaining |
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178 else: |
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179 size = min(remaining, size) |
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180 |
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181 result = object.__getattribute__(self, '_orig').readline(size) |
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182 remaining -= len(result) |
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183 |
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184 self._writelog('readline(%d from %d) -> (%d) %s' % ( |
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185 size, origsize, len(result), result)) |
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186 |
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187 object.__setattr__(self, '_closeafterrecvbytes', remaining) |
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188 |
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189 if remaining <= 0: |
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190 self._writelog('read limit reached; closing socket') |
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191 self._sock.close() |
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192 # This is the easiest way to abort the current request. |
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193 raise Exception('connection closed after receiving N bytes') |
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194 |
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195 return result |
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196 |
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197 def write(self, data): |
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198 remaining = object.__getattribute__(self, '_closeaftersendbytes') |
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199 |
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200 # No byte limit on this operation. Call original function. |
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201 if not remaining: |
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202 self._writelog('write(%d) -> %s' % (len(data), data)) |
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203 result = object.__getattribute__(self, '_orig').write(data) |
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204 return result |
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205 |
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206 if len(data) > remaining: |
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207 newdata = data[0:remaining] |
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208 else: |
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209 newdata = data |
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210 |
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211 remaining -= len(newdata) |
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212 |
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213 self._writelog('write(%d from %d) -> (%d) %s' % ( |
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214 len(newdata), len(data), remaining, newdata)) |
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215 |
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216 result = object.__getattribute__(self, '_orig').write(newdata) |
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217 |
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218 object.__setattr__(self, '_closeaftersendbytes', remaining) |
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219 |
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220 if remaining <= 0: |
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221 self._writelog('write limit reached; closing socket') |
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222 self._sock.close() |
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223 raise Exception('connection closed after sending N bytes') |
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224 |
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225 return result |
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226 |
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227 def extsetup(ui): |
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228 # Change the base HTTP server class so various events can be performed. |
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229 # See SocketServer.BaseServer for how the specially named methods work. |
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230 class badserver(server.MercurialHTTPServer): |
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231 def __init__(self, ui, *args, **kwargs): |
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232 self._ui = ui |
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233 super(badserver, self).__init__(ui, *args, **kwargs) |
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234 |
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235 # Need to inherit object so super() works. |
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236 class badrequesthandler(self.RequestHandlerClass, object): |
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237 def send_header(self, name, value): |
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238 # Make headers deterministic to facilitate testing. |
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239 if name.lower() == 'date': |
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240 value = 'Fri, 14 Apr 2017 00:00:00 GMT' |
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241 elif name.lower() == 'server': |
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242 value = 'badhttpserver' |
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243 |
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244 return super(badrequesthandler, self).send_header(name, |
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245 value) |
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246 |
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247 self.RequestHandlerClass = badrequesthandler |
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248 |
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249 # Called to accept() a pending socket. |
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250 def get_request(self): |
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251 if self._ui.configbool('badserver', 'closebeforeaccept'): |
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252 self.socket.close() |
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253 |
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254 # Tells the server to stop processing more requests. |
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255 self.__shutdown_request = True |
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256 |
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257 # Simulate failure to stop processing this request. |
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258 raise socket.error('close before accept') |
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259 |
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260 if self._ui.configbool('badserver', 'closeafteraccept'): |
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261 request, client_address = super(badserver, self).get_request() |
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262 request.close() |
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263 raise socket.error('close after accept') |
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264 |
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265 return super(badserver, self).get_request() |
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266 |
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267 # Does heavy lifting of processing a request. Invokes |
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268 # self.finish_request() which calls self.RequestHandlerClass() which |
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269 # is a hgweb.server._httprequesthandler. |
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270 def process_request(self, socket, address): |
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271 # Wrap socket in a proxy if we need to count bytes. |
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272 closeafterrecvbytes = self._ui.configint('badserver', |
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273 'closeafterrecvbytes') |
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274 closeaftersendbytes = self._ui.configint('badserver', |
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275 'closeaftersendbytes', 0) |
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276 |
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277 if closeafterrecvbytes or closeaftersendbytes: |
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278 socket = socketproxy(socket, self.errorlog, |
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279 closeafterrecvbytes=closeafterrecvbytes, |
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280 closeaftersendbytes=closeaftersendbytes) |
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281 |
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282 return super(badserver, self).process_request(socket, address) |
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283 |
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284 server.MercurialHTTPServer = badserver |