annotate tests/wireprotosimplecache.py @ 40892:140d455ef40a

test: enable sparse-revlog for test-hgweb-commands.t We are about to enable sparse-revlog globally. To help with reviewing the tests change, we isolate them in individual changesets. Differential Revision: https://phab.mercurial-scm.org/D5319
author Boris Feld <boris.feld@octobus.net>
date Mon, 12 Nov 2018 01:04:59 +0100
parents b27bcf81071b
children 268662aac075
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1 # wireprotosimplecache.py - Extension providing in-memory wire protocol cache
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2 #
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3 # Copyright 2018 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 from __future__ import absolute_import
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9
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10 from mercurial import (
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11 extensions,
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12 registrar,
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13 repository,
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14 util,
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15 wireprotoserver,
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16 wireprototypes,
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17 wireprotov2server,
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18 )
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19 from mercurial.utils import (
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20 interfaceutil,
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21 stringutil,
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22 )
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23
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24 CACHE = None
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25
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26 configtable = {}
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27 configitem = registrar.configitem(configtable)
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28
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29 configitem(b'simplecache', b'cacheapi',
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30 default=False)
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31 configitem(b'simplecache', b'cacheobjects',
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32 default=False)
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33 configitem(b'simplecache', b'redirectsfile',
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34 default=None)
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35
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36 # API handler that makes cached keys available.
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37 def handlecacherequest(rctx, req, res, checkperm, urlparts):
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38 if rctx.repo.ui.configbool(b'simplecache', b'cacheobjects'):
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39 res.status = b'500 Internal Server Error'
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40 res.setbodybytes(b'cacheobjects not supported for api server')
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41 return
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42
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43 if not urlparts:
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44 res.status = b'200 OK'
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45 res.headers[b'Content-Type'] = b'text/plain'
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46 res.setbodybytes(b'simple cache server')
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47 return
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48
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49 key = b'/'.join(urlparts)
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50
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51 if key not in CACHE:
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52 res.status = b'404 Not Found'
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53 res.headers[b'Content-Type'] = b'text/plain'
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54 res.setbodybytes(b'key not found in cache')
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55 return
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56
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57 res.status = b'200 OK'
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58 res.headers[b'Content-Type'] = b'application/mercurial-cbor'
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59 res.setbodybytes(CACHE[key])
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60
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61 def cachedescriptor(req, repo):
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62 return {}
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63
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64 wireprotoserver.API_HANDLERS[b'simplecache'] = {
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65 b'config': (b'simplecache', b'cacheapi'),
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66 b'handler': handlecacherequest,
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67 b'apidescriptor': cachedescriptor,
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68 }
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69
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70 @interfaceutil.implementer(repository.iwireprotocolcommandcacher)
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71 class memorycacher(object):
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72 def __init__(self, ui, command, encodefn, redirecttargets, redirecthashes,
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73 req):
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74 self.ui = ui
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75 self.encodefn = encodefn
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76 self.redirecttargets = redirecttargets
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77 self.redirecthashes = redirecthashes
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78 self.req = req
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79 self.key = None
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80 self.cacheobjects = ui.configbool(b'simplecache', b'cacheobjects')
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81 self.cacheapi = ui.configbool(b'simplecache', b'cacheapi')
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82 self.buffered = []
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83
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84 ui.log(b'simplecache', b'cacher constructed for %s\n', command)
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85
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86 def __enter__(self):
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87 return self
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88
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89 def __exit__(self, exctype, excvalue, exctb):
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90 if exctype:
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91 self.ui.log(b'simplecache', b'cacher exiting due to error\n')
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92
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93 def adjustcachekeystate(self, state):
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94 # Needed in order to make tests deterministic. Don't copy this
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95 # pattern for production caches!
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96 del state[b'repo']
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97
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98 def setcachekey(self, key):
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99 self.key = key
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100 return True
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101
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102 def lookup(self):
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103 if self.key not in CACHE:
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104 self.ui.log(b'simplecache', b'cache miss for %s\n', self.key)
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105 return None
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106
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107 entry = CACHE[self.key]
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108 self.ui.log(b'simplecache', b'cache hit for %s\n', self.key)
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109
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110 redirectable = True
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111
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112 if not self.cacheapi:
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113 redirectable = False
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114 elif not self.redirecttargets:
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115 redirectable = False
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116 else:
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117 clienttargets = set(self.redirecttargets)
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118 ourtargets = set(t[b'name'] for t in loadredirecttargets(self.ui))
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119
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120 # We only ever redirect to a single target (for now). So we don't
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121 # need to store which target matched.
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122 if not clienttargets & ourtargets:
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123 redirectable = False
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124
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125 if redirectable:
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126 paths = self.req.dispatchparts[:-3]
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127 paths.append(b'simplecache')
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128 paths.append(self.key)
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129
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130 url = b'%s/%s' % (self.req.baseurl, b'/'.join(paths))
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131
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132 #url = b'http://example.com/%s' % self.key
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133 self.ui.log(b'simplecache', b'sending content redirect for %s to '
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134 b'%s\n', self.key, url)
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135 response = wireprototypes.alternatelocationresponse(
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136 url=url,
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137 mediatype=b'application/mercurial-cbor')
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138
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139 return {b'objs': [response]}
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140
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141 if self.cacheobjects:
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142 return {
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143 b'objs': entry,
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144 }
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145 else:
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146 return {
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147 b'objs': [wireprototypes.encodedresponse(entry)],
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148 }
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149
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150 def onobject(self, obj):
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151 if self.cacheobjects:
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152 self.buffered.append(obj)
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153 else:
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154 self.buffered.extend(self.encodefn(obj))
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155
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156 yield obj
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157
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158 def onfinished(self):
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159 self.ui.log(b'simplecache', b'storing cache entry for %s\n', self.key)
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160 if self.cacheobjects:
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161 CACHE[self.key] = self.buffered
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162 else:
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163 CACHE[self.key] = b''.join(self.buffered)
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164
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165 return []
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166
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167 def makeresponsecacher(orig, repo, proto, command, args, objencoderfn,
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168 redirecttargets, redirecthashes):
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169 return memorycacher(repo.ui, command, objencoderfn, redirecttargets,
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170 redirecthashes, proto._req)
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171
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172 def loadredirecttargets(ui):
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173 path = ui.config(b'simplecache', b'redirectsfile')
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174 if not path:
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175 return []
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176
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177 with open(path, 'rb') as fh:
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178 s = fh.read()
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179
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180 return stringutil.evalpythonliteral(s)
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181
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182 def getadvertisedredirecttargets(orig, repo, proto):
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183 return loadredirecttargets(repo.ui)
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184
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185 def extsetup(ui):
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186 global CACHE
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187
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188 CACHE = util.lrucachedict(10000)
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189
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190 extensions.wrapfunction(wireprotov2server, b'makeresponsecacher',
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191 makeresponsecacher)
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192 extensions.wrapfunction(wireprotov2server, b'getadvertisedredirecttargets',
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193 getadvertisedredirecttargets)