Mercurial > hg
annotate tests/testlib/badserverext.py @ 48617:9642dbe7bca1
test-http-bad-server: document that the value are actually a list
I don't really expect this doc to be read a lot, but mentioning that this is a
list seems important.
Differential Revision: https://phab.mercurial-scm.org/D12048
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sat, 22 Jan 2022 01:13:12 +0100 |
parents | 98c502a2c462 |
children | 9dc00c5617ea |
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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 close-before-accept |
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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 close-after-accept |
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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 close-after-recv-bytes |
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26 If defined, close the client socket after receiving this many bytes. |
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27 (The value is a list, multiple values can use used to close a series of requests |
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28 request) |
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29 |
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30 close-after-send-bytes |
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31 If defined, close the client socket after sending this many bytes. |
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32 (The value is a list, multiple values can use used to close a series of requests |
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33 request) |
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34 """ |
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35 |
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36 from __future__ import absolute_import |
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37 |
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38 import socket |
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39 |
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40 from mercurial import ( |
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41 pycompat, |
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42 registrar, |
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43 ) |
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44 |
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45 from mercurial.hgweb import server |
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46 |
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47 configtable = {} |
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48 configitem = registrar.configitem(configtable) |
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49 |
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50 configitem( |
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51 b'badserver', |
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52 b'close-after-accept', |
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53 default=False, |
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54 ) |
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55 configitem( |
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56 b'badserver', |
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57 b'close-after-recv-bytes', |
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58 default=b'0', |
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59 ) |
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60 configitem( |
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61 b'badserver', |
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62 b'close-after-send-bytes', |
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63 default=b'0', |
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64 ) |
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65 configitem( |
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66 b'badserver', |
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67 b'close-before-accept', |
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68 default=False, |
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69 ) |
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70 |
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71 |
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72 class ConditionTracker(object): |
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73 def __init__(self, close_after_recv_bytes, close_after_send_bytes): |
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74 self._all_close_after_recv_bytes = close_after_recv_bytes |
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75 self._all_close_after_send_bytes = close_after_send_bytes |
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76 |
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77 self.target_recv_bytes = None |
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78 self.remaining_recv_bytes = None |
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79 self.target_send_bytes = None |
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80 self.remaining_send_bytes = None |
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81 |
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82 def start_next_request(self): |
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83 """move to the next set of close condition""" |
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84 if self._all_close_after_recv_bytes: |
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85 self.target_recv_bytes = self._all_close_after_recv_bytes.pop(0) |
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86 self.remaining_recv_bytes = self.target_recv_bytes |
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87 else: |
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88 self.target_recv_bytes = None |
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89 self.remaining_recv_bytes = None |
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90 if self._all_close_after_send_bytes: |
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91 self.target_send_bytes = self._all_close_after_send_bytes.pop(0) |
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92 self.remaining_send_bytes = self.target_send_bytes |
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93 else: |
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94 self.target_send_bytes = None |
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95 self.remaining_send_bytes = None |
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96 |
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97 def might_close(self): |
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98 """True, if any processing will be needed""" |
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99 if self.remaining_recv_bytes is not None: |
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100 return True |
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101 if self.remaining_send_bytes is not None: |
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102 return True |
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103 return False |
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104 |
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105 def forward_write(self, obj, method, data, *args, **kwargs): |
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106 """call an underlying write function until condition are met |
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107 |
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108 When the condition are met the socket is closed |
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109 """ |
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110 remaining = self.remaining_send_bytes |
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111 |
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112 orig = object.__getattribute__(obj, '_orig') |
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113 bmethod = method.encode('ascii') |
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114 func = getattr(orig, method) |
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115 |
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116 if remaining: |
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117 remaining = max(0, remaining) |
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118 |
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119 if not remaining: |
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120 newdata = data |
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121 else: |
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122 if remaining < len(data): |
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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 remaining -= len(newdata) |
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127 self.remaining_send_bytes = remaining |
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128 |
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129 result = func(newdata, *args, **kwargs) |
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130 |
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131 if remaining is None: |
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132 obj._writelog(b'%s(%d) -> %s' % (bmethod, len(data), data)) |
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133 else: |
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134 obj._writelog( |
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135 b'%s(%d from %d) -> (%d) %s' |
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136 % ( |
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137 bmethod, |
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138 len(newdata), |
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139 len(data), |
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140 remaining, |
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141 newdata, |
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142 ) |
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143 ) |
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144 |
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145 if remaining is not None and remaining <= 0: |
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146 obj._writelog(b'write limit reached; closing socket') |
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147 object.__getattribute__(obj, '_cond_close')() |
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148 raise Exception('connection closed after sending N bytes') |
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149 |
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150 return result |
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151 |
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152 def forward_read(self, obj, method, size=-1): |
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153 """call an underlying read function until condition are met |
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154 |
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155 When the condition are met the socket is closed |
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156 """ |
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157 remaining = self.remaining_recv_bytes |
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158 |
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159 orig = object.__getattribute__(obj, '_orig') |
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160 bmethod = method.encode('ascii') |
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161 func = getattr(orig, method) |
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162 |
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163 requested_size = size |
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164 actual_size = size |
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165 |
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166 if remaining: |
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167 if size < 0: |
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168 actual_size = remaining |
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169 else: |
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170 actual_size = min(remaining, requested_size) |
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171 |
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172 result = func(actual_size) |
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173 |
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174 if remaining: |
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175 remaining -= len(result) |
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176 self.remaining_recv_bytes = remaining |
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177 |
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178 if requested_size == 65537: |
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179 requested_repr = b'~' |
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180 else: |
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181 requested_repr = b'%d' % requested_size |
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182 if requested_size == actual_size: |
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183 msg = b'%s(%s) -> (%d) %s' |
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184 msg %= (bmethod, requested_repr, len(result), result) |
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185 else: |
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186 msg = b'%s(%d from %s) -> (%d) %s' |
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187 msg %= (bmethod, actual_size, requested_repr, len(result), result) |
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188 obj._writelog(msg) |
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189 |
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190 if remaining is not None and remaining <= 0: |
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191 obj._writelog(b'read limit reached; closing socket') |
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192 obj._cond_close() |
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193 |
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194 # This is the easiest way to abort the current request. |
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195 raise Exception('connection closed after receiving N bytes') |
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196 |
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197 return result |
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198 |
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199 |
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200 # We can't adjust __class__ on a socket instance. So we define a proxy type. |
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201 class socketproxy(object): |
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202 __slots__ = ('_orig', '_logfp', '_cond') |
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203 |
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204 def __init__(self, obj, logfp, condition_tracked): |
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205 object.__setattr__(self, '_orig', obj) |
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206 object.__setattr__(self, '_logfp', logfp) |
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207 object.__setattr__(self, '_cond', condition_tracked) |
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208 |
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209 def __getattribute__(self, name): |
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210 if name in ('makefile', 'sendall', '_writelog', '_cond_close'): |
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211 return object.__getattribute__(self, name) |
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212 |
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213 return getattr(object.__getattribute__(self, '_orig'), name) |
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214 |
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215 def __delattr__(self, name): |
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216 delattr(object.__getattribute__(self, '_orig'), name) |
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217 |
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218 def __setattr__(self, name, value): |
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219 setattr(object.__getattribute__(self, '_orig'), name, value) |
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220 |
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221 def _writelog(self, msg): |
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222 msg = msg.replace(b'\r', b'\\r').replace(b'\n', b'\\n') |
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223 |
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224 object.__getattribute__(self, '_logfp').write(msg) |
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225 object.__getattribute__(self, '_logfp').write(b'\n') |
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226 object.__getattribute__(self, '_logfp').flush() |
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227 |
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228 def makefile(self, mode, bufsize): |
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229 f = object.__getattribute__(self, '_orig').makefile(mode, bufsize) |
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230 |
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231 logfp = object.__getattribute__(self, '_logfp') |
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232 cond = object.__getattribute__(self, '_cond') |
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233 |
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234 return fileobjectproxy(f, logfp, cond) |
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235 |
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236 def sendall(self, data, flags=0): |
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237 cond = object.__getattribute__(self, '_cond') |
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238 return cond.forward_write(self, 'sendall', data, flags) |
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239 |
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240 def _cond_close(self): |
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241 object.__getattribute__(self, '_orig').shutdown(socket.SHUT_RDWR) |
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242 |
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243 |
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244 # We can't adjust __class__ on socket._fileobject, so define a proxy. |
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245 class fileobjectproxy(object): |
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246 __slots__ = ('_orig', '_logfp', '_cond') |
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247 |
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248 def __init__(self, obj, logfp, condition_tracked): |
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249 object.__setattr__(self, '_orig', obj) |
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250 object.__setattr__(self, '_logfp', logfp) |
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251 object.__setattr__(self, '_cond', condition_tracked) |
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252 |
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253 def __getattribute__(self, name): |
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254 if name in ( |
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255 '_close', |
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256 'read', |
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257 'readline', |
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258 'write', |
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259 '_writelog', |
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260 '_cond_close', |
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261 ): |
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262 return object.__getattribute__(self, name) |
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263 |
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264 return getattr(object.__getattribute__(self, '_orig'), name) |
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265 |
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266 def __delattr__(self, name): |
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267 delattr(object.__getattribute__(self, '_orig'), name) |
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268 |
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269 def __setattr__(self, name, value): |
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270 setattr(object.__getattribute__(self, '_orig'), name, value) |
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271 |
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272 def _writelog(self, msg): |
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273 msg = msg.replace(b'\r', b'\\r').replace(b'\n', b'\\n') |
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274 |
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275 object.__getattribute__(self, '_logfp').write(msg) |
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276 object.__getattribute__(self, '_logfp').write(b'\n') |
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277 object.__getattribute__(self, '_logfp').flush() |
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278 |
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279 def _close(self): |
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280 # Python 3 uses an io.BufferedIO instance. Python 2 uses some file |
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281 # object wrapper. |
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282 if pycompat.ispy3: |
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283 orig = object.__getattribute__(self, '_orig') |
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284 |
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285 if hasattr(orig, 'raw'): |
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286 orig.raw._sock.shutdown(socket.SHUT_RDWR) |
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287 else: |
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288 self.close() |
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289 else: |
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290 self._sock.shutdown(socket.SHUT_RDWR) |
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291 |
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292 def read(self, size=-1): |
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293 cond = object.__getattribute__(self, '_cond') |
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294 return cond.forward_read(self, 'read', size) |
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295 |
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296 def readline(self, size=-1): |
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297 cond = object.__getattribute__(self, '_cond') |
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298 return cond.forward_read(self, 'readline', size) |
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299 |
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300 def write(self, data): |
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301 cond = object.__getattribute__(self, '_cond') |
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302 return cond.forward_write(self, 'write', data) |
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303 |
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304 def _cond_close(self): |
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305 self._close() |
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306 |
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307 |
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308 def process_config(value): |
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309 parts = value.split(b',') |
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310 integers = [int(v) for v in parts if v] |
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311 return [v if v else None for v in integers] |
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312 |
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313 |
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314 def extsetup(ui): |
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315 # Change the base HTTP server class so various events can be performed. |
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316 # See SocketServer.BaseServer for how the specially named methods work. |
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317 class badserver(server.MercurialHTTPServer): |
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318 def __init__(self, ui, *args, **kwargs): |
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319 self._ui = ui |
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320 super(badserver, self).__init__(ui, *args, **kwargs) |
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321 |
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322 all_recv_bytes = self._ui.config( |
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323 b'badserver', b'close-after-recv-bytes' |
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324 ) |
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325 all_recv_bytes = process_config(all_recv_bytes) |
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326 all_send_bytes = self._ui.config( |
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327 b'badserver', b'close-after-send-bytes' |
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328 ) |
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329 all_send_bytes = process_config(all_send_bytes) |
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330 self._cond = ConditionTracker(all_recv_bytes, all_send_bytes) |
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331 |
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332 # Need to inherit object so super() works. |
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333 class badrequesthandler(self.RequestHandlerClass, object): |
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334 def send_header(self, name, value): |
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335 # Make headers deterministic to facilitate testing. |
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336 if name.lower() == 'date': |
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337 value = 'Fri, 14 Apr 2017 00:00:00 GMT' |
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338 elif name.lower() == 'server': |
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339 value = 'badhttpserver' |
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340 |
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341 return super(badrequesthandler, self).send_header( |
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342 name, value |
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343 ) |
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344 |
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345 self.RequestHandlerClass = badrequesthandler |
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346 |
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347 # Called to accept() a pending socket. |
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348 def get_request(self): |
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349 if self._ui.configbool(b'badserver', b'close-before-accept'): |
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350 self.socket.close() |
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351 |
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352 # Tells the server to stop processing more requests. |
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353 self.__shutdown_request = True |
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354 |
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355 # Simulate failure to stop processing this request. |
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356 raise socket.error('close before accept') |
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357 |
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358 if self._ui.configbool(b'badserver', b'close-after-accept'): |
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359 request, client_address = super(badserver, self).get_request() |
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360 request.close() |
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361 raise socket.error('close after accept') |
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362 |
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363 return super(badserver, self).get_request() |
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364 |
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365 # Does heavy lifting of processing a request. Invokes |
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366 # self.finish_request() which calls self.RequestHandlerClass() which |
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367 # is a hgweb.server._httprequesthandler. |
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368 def process_request(self, socket, address): |
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369 # Wrap socket in a proxy if we need to count bytes. |
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370 self._cond.start_next_request() |
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371 |
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372 if self._cond.might_close(): |
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373 socket = socketproxy( |
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374 socket, self.errorlog, condition_tracked=self._cond |
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375 ) |
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376 |
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377 return super(badserver, self).process_request(socket, address) |
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378 |
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379 server.MercurialHTTPServer = badserver |