Mercurial > hg
annotate tests/testlib/badserverext.py @ 48613:b060e305d79f
test-http-bad-server: factor code dealing with "read" in the new object
This will make sure both `read` and `readline` do the same processing and make
it simpler to update that processing in the future.
Differential Revision: https://phab.mercurial-scm.org/D12044
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 21 Jan 2022 03:05:43 +0100 |
parents | 11e5cb170d36 |
children | 3efc8644dd00 |
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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 |
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28 close-after-send-bytes |
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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'close-after-accept', |
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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'close-after-recv-bytes', |
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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'close-after-send-bytes', |
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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'close-before-accept', |
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64 default=False, |
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65 ) |
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66 |
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67 |
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68 class ConditionTracker(object): |
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69 def __init__(self, close_after_recv_bytes, close_after_send_bytes): |
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70 self._all_close_after_recv_bytes = close_after_recv_bytes |
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71 self._all_close_after_send_bytes = close_after_send_bytes |
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72 |
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73 self.target_recv_bytes = None |
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74 self.remaining_recv_bytes = None |
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75 self.target_send_bytes = None |
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76 self.remaining_send_bytes = None |
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77 |
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78 def start_next_request(self): |
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79 """move to the next set of close condition""" |
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80 if self._all_close_after_recv_bytes: |
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81 self.target_recv_bytes = self._all_close_after_recv_bytes.pop(0) |
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82 self.remaining_recv_bytes = self.target_recv_bytes |
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83 else: |
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84 self.target_recv_bytes = None |
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85 self.remaining_recv_bytes = None |
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86 if self._all_close_after_send_bytes: |
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87 self.target_send_bytes = self._all_close_after_send_bytes.pop(0) |
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88 self.remaining_send_bytes = self.target_send_bytes |
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89 else: |
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90 self.target_send_bytes = None |
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91 self.remaining_send_bytes = None |
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92 |
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93 def might_close(self): |
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94 """True, if any processing will be needed""" |
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95 if self.remaining_recv_bytes is not None: |
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96 return True |
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97 if self.remaining_send_bytes is not None: |
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98 return True |
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99 return False |
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100 |
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101 def forward_write(self, obj, method, data, *args, **kwargs): |
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102 """call an underlying write function until condition are met |
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103 |
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104 When the condition are met the socket is closed |
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105 """ |
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106 remaining = self.remaining_send_bytes |
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107 |
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108 orig = object.__getattribute__(obj, '_orig') |
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109 bmethod = method.encode('ascii') |
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110 func = getattr(orig, method) |
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111 # No byte limit on this operation. Call original function. |
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112 if not remaining: |
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113 result = func(data, *args, **kwargs) |
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114 obj._writelog(b'%s(%d) -> %s' % (bmethod, len(data), data)) |
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115 return result |
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116 |
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117 remaining = max(0, remaining) |
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118 |
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119 if remaining > 0: |
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120 if remaining < len(data): |
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121 newdata = data[0:remaining] |
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122 else: |
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123 newdata = data |
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124 |
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125 remaining -= len(newdata) |
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126 |
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127 obj._writelog( |
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128 b'%s(%d from %d) -> (%d) %s' |
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129 % ( |
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130 bmethod, |
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131 len(newdata), |
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132 len(data), |
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133 remaining, |
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134 newdata, |
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135 ) |
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136 ) |
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137 |
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138 result = func(newdata, *args, **kwargs) |
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139 |
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140 self.remaining_send_bytes = remaining |
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141 |
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142 if remaining <= 0: |
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143 obj._writelog(b'write limit reached; closing socket') |
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144 object.__getattribute__(obj, '_cond_close')() |
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145 raise Exception('connection closed after sending N bytes') |
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146 |
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147 return result |
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148 |
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149 def forward_read(self, obj, method, size=-1): |
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150 """call an underlying read function until condition are met |
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151 |
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152 When the condition are met the socket is closed |
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153 """ |
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154 remaining = self.remaining_recv_bytes |
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155 |
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156 orig = object.__getattribute__(obj, '_orig') |
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157 bmethod = method.encode('ascii') |
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158 func = getattr(orig, method) |
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159 |
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160 # No read limit. Call original function. |
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161 if not remaining: |
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162 result = func(size) |
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163 obj._writelog( |
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164 b'%s(%d) -> (%d) %s' % (bmethod, size, len(result), result) |
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165 ) |
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166 return result |
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167 |
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168 origsize = size |
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169 |
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170 if size < 0: |
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171 size = remaining |
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172 else: |
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173 size = min(remaining, size) |
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174 |
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175 result = func(size) |
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176 remaining -= len(result) |
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177 |
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178 obj._writelog( |
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179 b'%s(%d from %d) -> (%d) %s' |
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180 % (bmethod, size, origsize, len(result), result) |
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181 ) |
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182 |
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183 self.remaining_recv_bytes = remaining |
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184 |
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185 if remaining <= 0: |
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186 obj._writelog(b'read limit reached; closing socket') |
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187 obj._cond_close() |
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188 |
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189 # This is the easiest way to abort the current request. |
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190 raise Exception('connection closed after receiving N bytes') |
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191 |
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192 return result |
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193 |
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194 |
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195 # We can't adjust __class__ on a socket instance. So we define a proxy type. |
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196 class socketproxy(object): |
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197 __slots__ = ('_orig', '_logfp', '_cond') |
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198 |
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199 def __init__(self, obj, logfp, condition_tracked): |
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200 object.__setattr__(self, '_orig', obj) |
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201 object.__setattr__(self, '_logfp', logfp) |
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202 object.__setattr__(self, '_cond', condition_tracked) |
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203 |
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204 def __getattribute__(self, name): |
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205 if name in ('makefile', 'sendall', '_writelog', '_cond_close'): |
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206 return object.__getattribute__(self, name) |
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207 |
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208 return getattr(object.__getattribute__(self, '_orig'), name) |
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209 |
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210 def __delattr__(self, name): |
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211 delattr(object.__getattribute__(self, '_orig'), name) |
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212 |
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213 def __setattr__(self, name, value): |
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214 setattr(object.__getattribute__(self, '_orig'), name, value) |
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215 |
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216 def _writelog(self, msg): |
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217 msg = msg.replace(b'\r', b'\\r').replace(b'\n', b'\\n') |
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218 |
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219 object.__getattribute__(self, '_logfp').write(msg) |
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220 object.__getattribute__(self, '_logfp').write(b'\n') |
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221 object.__getattribute__(self, '_logfp').flush() |
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222 |
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223 def makefile(self, mode, bufsize): |
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224 f = object.__getattribute__(self, '_orig').makefile(mode, bufsize) |
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225 |
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226 logfp = object.__getattribute__(self, '_logfp') |
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227 cond = object.__getattribute__(self, '_cond') |
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228 |
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229 return fileobjectproxy(f, logfp, cond) |
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230 |
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231 def sendall(self, data, flags=0): |
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232 cond = object.__getattribute__(self, '_cond') |
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233 return cond.forward_write(self, 'sendall', data, flags) |
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234 |
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235 def _cond_close(self): |
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236 object.__getattribute__(self, '_orig').shutdown(socket.SHUT_RDWR) |
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237 |
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238 |
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239 # We can't adjust __class__ on socket._fileobject, so define a proxy. |
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240 class fileobjectproxy(object): |
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241 __slots__ = ('_orig', '_logfp', '_cond') |
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242 |
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243 def __init__(self, obj, logfp, condition_tracked): |
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244 object.__setattr__(self, '_orig', obj) |
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245 object.__setattr__(self, '_logfp', logfp) |
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246 object.__setattr__(self, '_cond', condition_tracked) |
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247 |
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248 def __getattribute__(self, name): |
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249 if name in ( |
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250 '_close', |
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251 'read', |
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252 'readline', |
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253 'write', |
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254 '_writelog', |
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255 '_cond_close', |
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256 ): |
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257 return object.__getattribute__(self, name) |
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258 |
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259 return getattr(object.__getattribute__(self, '_orig'), name) |
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260 |
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261 def __delattr__(self, name): |
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262 delattr(object.__getattribute__(self, '_orig'), name) |
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263 |
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264 def __setattr__(self, name, value): |
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265 setattr(object.__getattribute__(self, '_orig'), name, value) |
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266 |
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267 def _writelog(self, msg): |
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268 msg = msg.replace(b'\r', b'\\r').replace(b'\n', b'\\n') |
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269 |
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270 object.__getattribute__(self, '_logfp').write(msg) |
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271 object.__getattribute__(self, '_logfp').write(b'\n') |
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272 object.__getattribute__(self, '_logfp').flush() |
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273 |
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274 def _close(self): |
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275 # Python 3 uses an io.BufferedIO instance. Python 2 uses some file |
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276 # object wrapper. |
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277 if pycompat.ispy3: |
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278 orig = object.__getattribute__(self, '_orig') |
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279 |
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280 if hasattr(orig, 'raw'): |
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281 orig.raw._sock.shutdown(socket.SHUT_RDWR) |
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282 else: |
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283 self.close() |
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284 else: |
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285 self._sock.shutdown(socket.SHUT_RDWR) |
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286 |
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287 def read(self, size=-1): |
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288 cond = object.__getattribute__(self, '_cond') |
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289 return cond.forward_read(self, 'read', size) |
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290 |
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291 def readline(self, size=-1): |
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292 cond = object.__getattribute__(self, '_cond') |
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293 return cond.forward_read(self, 'readline', size) |
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294 |
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295 def write(self, data): |
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296 cond = object.__getattribute__(self, '_cond') |
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297 return cond.forward_write(self, 'write', data) |
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298 |
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299 def _cond_close(self): |
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300 self._close() |
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301 |
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302 |
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303 def process_config(value): |
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304 parts = value.split(b',') |
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305 integers = [int(v) for v in parts if v] |
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306 return [v if v else None for v in integers] |
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307 |
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308 |
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309 def extsetup(ui): |
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310 # Change the base HTTP server class so various events can be performed. |
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311 # See SocketServer.BaseServer for how the specially named methods work. |
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312 class badserver(server.MercurialHTTPServer): |
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313 def __init__(self, ui, *args, **kwargs): |
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314 self._ui = ui |
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315 super(badserver, self).__init__(ui, *args, **kwargs) |
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316 |
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317 all_recv_bytes = self._ui.config( |
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318 b'badserver', b'close-after-recv-bytes' |
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319 ) |
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320 all_recv_bytes = process_config(all_recv_bytes) |
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321 all_send_bytes = self._ui.config( |
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322 b'badserver', b'close-after-send-bytes' |
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323 ) |
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324 all_send_bytes = process_config(all_send_bytes) |
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325 self._cond = ConditionTracker(all_recv_bytes, all_send_bytes) |
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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'close-before-accept'): |
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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'close-after-accept'): |
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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 self._cond.start_next_request() |
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366 |
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367 if self._cond.might_close(): |
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368 socket = socketproxy( |
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369 socket, self.errorlog, condition_tracked=self._cond |
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370 ) |
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371 |
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372 return super(badserver, self).process_request(socket, address) |
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373 |
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374 server.MercurialHTTPServer = badserver |