Mercurial > hg
annotate mercurial/urllibcompat.py @ 39559:07b58266bce3
wireprotov2: implement commands as a generator of objects
Previously, wire protocol version 2 inherited version 1's model of
having separate types to represent the results of different wire
protocol commands.
As I implemented more powerful commands in future commits, I found
I was using a common pattern of returning a special type to hold a
generator. This meant the command function required a closure to
do most of the work. That made logic flow more difficult to follow.
I also noticed that many commands were effectively a sequence of
objects to be CBOR encoded.
I think it makes sense to define version 2 commands as generators.
This way, commands can simply emit the data structures they wish to
send to the client. This eliminates the need for a closure in
command functions and removes encoding from the bodies of commands.
As part of this commit, the handling of response objects has been
moved into the serverreactor class. This puts the reactor in the
driver's seat with regards to CBOR encoding and error handling.
Having error handling in the function that emits frames is
particularly important because exceptions in that function can lead
to things getting in a bad state: I'm fairly certain that uncaught
exceptions in the frame generator were causing deadlocks.
I also introduced a dedicated error type for explicit error reporting
in command handlers. This will be used in subsequent commits.
There's still a bit of work to be done here, especially around
formalizing the error handling "protocol." I've added yet another
TODO to track this so we don't forget.
Test output changed because we're using generators and no longer know
we are at the end of the data until we hit the end of the generator.
This means we can't emit the end-of-stream flag until we've exhausted
the generator. Hence the introduction of 0-sized end-of-stream frames.
Differential Revision: https://phab.mercurial-scm.org/D4472
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 05 Sep 2018 09:06:40 -0700 |
parents | 5bc7ff103081 |
children | 5774fc623a18 |
rev | line source |
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1 # urllibcompat.py - adapters to ease using urllib2 on Py2 and urllib on Py3 |
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2 # |
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3 # Copyright 2017 Google, Inc. |
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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 from __future__ import absolute_import |
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8 |
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9 from . import pycompat |
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10 |
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11 _sysstr = pycompat.sysstr |
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12 |
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13 class _pycompatstub(object): |
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14 def __init__(self): |
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15 self._aliases = {} |
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16 |
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17 def _registeraliases(self, origin, items): |
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18 """Add items that will be populated at the first access""" |
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19 items = map(_sysstr, items) |
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20 self._aliases.update( |
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21 (item.replace(r'_', r'').lower(), (origin, item)) |
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22 for item in items) |
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23 |
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24 def _registeralias(self, origin, attr, name): |
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25 """Alias ``origin``.``attr`` as ``name``""" |
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26 self._aliases[_sysstr(name)] = (origin, _sysstr(attr)) |
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27 |
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28 def __getattr__(self, name): |
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29 try: |
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30 origin, item = self._aliases[name] |
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31 except KeyError: |
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32 raise AttributeError(name) |
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33 self.__dict__[name] = obj = getattr(origin, item) |
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34 return obj |
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35 |
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36 httpserver = _pycompatstub() |
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37 urlreq = _pycompatstub() |
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38 urlerr = _pycompatstub() |
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39 |
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40 if pycompat.ispy3: |
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41 import urllib.parse |
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42 urlreq._registeraliases(urllib.parse, ( |
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43 "splitattr", |
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44 "splitpasswd", |
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45 "splitport", |
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46 "splituser", |
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47 "urlparse", |
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48 "urlunparse", |
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49 )) |
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50 urlreq._registeralias(urllib.parse, "parse_qs", "parseqs") |
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51 urlreq._registeralias(urllib.parse, "parse_qsl", "parseqsl") |
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52 urlreq._registeralias(urllib.parse, "unquote_to_bytes", "unquote") |
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53 import urllib.request |
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54 urlreq._registeraliases(urllib.request, ( |
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55 "AbstractHTTPHandler", |
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56 "BaseHandler", |
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57 "build_opener", |
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58 "FileHandler", |
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59 "FTPHandler", |
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60 "ftpwrapper", |
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61 "HTTPHandler", |
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62 "HTTPSHandler", |
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63 "install_opener", |
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64 "pathname2url", |
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65 "HTTPBasicAuthHandler", |
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66 "HTTPDigestAuthHandler", |
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67 "HTTPPasswordMgrWithDefaultRealm", |
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68 "ProxyHandler", |
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69 "Request", |
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70 "url2pathname", |
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71 "urlopen", |
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72 )) |
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73 import urllib.response |
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74 urlreq._registeraliases(urllib.response, ( |
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75 "addclosehook", |
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76 "addinfourl", |
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77 )) |
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78 import urllib.error |
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79 urlerr._registeraliases(urllib.error, ( |
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80 "HTTPError", |
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81 "URLError", |
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82 )) |
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83 import http.server |
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84 httpserver._registeraliases(http.server, ( |
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85 "HTTPServer", |
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86 "BaseHTTPRequestHandler", |
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87 "SimpleHTTPRequestHandler", |
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88 "CGIHTTPRequestHandler", |
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89 )) |
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90 |
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91 # urllib.parse.quote() accepts both str and bytes, decodes bytes |
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92 # (if necessary), and returns str. This is wonky. We provide a custom |
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93 # implementation that only accepts bytes and emits bytes. |
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94 def quote(s, safe=r'/'): |
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95 s = urllib.parse.quote_from_bytes(s, safe=safe) |
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96 return s.encode('ascii', 'strict') |
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97 |
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98 # urllib.parse.urlencode() returns str. We use this function to make |
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99 # sure we return bytes. |
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100 def urlencode(query, doseq=False): |
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101 s = urllib.parse.urlencode(query, doseq=doseq) |
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102 return s.encode('ascii') |
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103 |
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104 urlreq.quote = quote |
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105 urlreq.urlencode = urlencode |
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106 |
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107 def getfullurl(req): |
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108 return req.full_url |
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109 |
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110 def gethost(req): |
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111 return req.host |
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112 |
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113 def getselector(req): |
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114 return req.selector |
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115 |
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116 def getdata(req): |
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117 return req.data |
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118 |
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119 def hasdata(req): |
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120 return req.data is not None |
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121 else: |
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122 import BaseHTTPServer |
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123 import CGIHTTPServer |
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124 import SimpleHTTPServer |
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125 import urllib2 |
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126 import urllib |
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127 import urlparse |
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128 urlreq._registeraliases(urllib, ( |
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129 "addclosehook", |
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130 "addinfourl", |
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131 "ftpwrapper", |
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132 "pathname2url", |
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133 "quote", |
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134 "splitattr", |
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135 "splitpasswd", |
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136 "splitport", |
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137 "splituser", |
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138 "unquote", |
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139 "url2pathname", |
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140 "urlencode", |
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141 )) |
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142 urlreq._registeraliases(urllib2, ( |
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143 "AbstractHTTPHandler", |
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144 "BaseHandler", |
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145 "build_opener", |
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146 "FileHandler", |
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147 "FTPHandler", |
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148 "HTTPBasicAuthHandler", |
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149 "HTTPDigestAuthHandler", |
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150 "HTTPHandler", |
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151 "HTTPPasswordMgrWithDefaultRealm", |
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152 "HTTPSHandler", |
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153 "install_opener", |
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154 "ProxyHandler", |
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155 "Request", |
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156 "urlopen", |
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157 )) |
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158 urlreq._registeraliases(urlparse, ( |
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159 "urlparse", |
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160 "urlunparse", |
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161 )) |
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162 urlreq._registeralias(urlparse, "parse_qs", "parseqs") |
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163 urlreq._registeralias(urlparse, "parse_qsl", "parseqsl") |
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164 urlerr._registeraliases(urllib2, ( |
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165 "HTTPError", |
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166 "URLError", |
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167 )) |
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168 httpserver._registeraliases(BaseHTTPServer, ( |
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169 "HTTPServer", |
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170 "BaseHTTPRequestHandler", |
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171 )) |
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172 httpserver._registeraliases(SimpleHTTPServer, ( |
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173 "SimpleHTTPRequestHandler", |
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174 )) |
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175 httpserver._registeraliases(CGIHTTPServer, ( |
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176 "CGIHTTPRequestHandler", |
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177 )) |
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178 |
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179 def gethost(req): |
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180 return req.get_host() |
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181 |
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182 def getselector(req): |
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183 return req.get_selector() |
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184 |
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185 def getfullurl(req): |
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186 return req.get_full_url() |
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187 |
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188 def getdata(req): |
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189 return req.get_data() |
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190 |
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191 def hasdata(req): |
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192 return req.has_data() |