annotate tests/wireprotosimplecache.py @ 43016:92c8bae84e7a

automation: increase size of Linux AMI build volume I ran out of space attempting to build a few AMIs. Let's give the environment an extra 2 GB to utilize. Differential Revision: https://phab.mercurial-scm.org/D6915
author Gregory Szorc <gregory.szorc@gmail.com>
date Sun, 29 Sep 2019 11:06:45 -0700
parents 2c4f656c8e9f
children 2372284d9457
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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 util,
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14 wireprotoserver,
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15 wireprototypes,
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16 wireprotov2server,
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17 )
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18 from mercurial.interfaces import (
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19 repository,
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20 util as interfaceutil,
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21 )
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22 from mercurial.utils import (
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23 stringutil,
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24 )
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25
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26 CACHE = None
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27
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28 configtable = {}
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29 configitem = registrar.configitem(configtable)
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30
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31 configitem(b'simplecache', b'cacheapi',
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32 default=False)
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33 configitem(b'simplecache', b'cacheobjects',
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34 default=False)
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35 configitem(b'simplecache', b'redirectsfile',
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36 default=None)
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37
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38 # API handler that makes cached keys available.
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39 def handlecacherequest(rctx, req, res, checkperm, urlparts):
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40 if rctx.repo.ui.configbool(b'simplecache', b'cacheobjects'):
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41 res.status = b'500 Internal Server Error'
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42 res.setbodybytes(b'cacheobjects not supported for api server')
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43 return
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44
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45 if not urlparts:
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46 res.status = b'200 OK'
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47 res.headers[b'Content-Type'] = b'text/plain'
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48 res.setbodybytes(b'simple cache server')
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49 return
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50
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51 key = b'/'.join(urlparts)
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52
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53 if key not in CACHE:
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54 res.status = b'404 Not Found'
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55 res.headers[b'Content-Type'] = b'text/plain'
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56 res.setbodybytes(b'key not found in cache')
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57 return
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58
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59 res.status = b'200 OK'
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60 res.headers[b'Content-Type'] = b'application/mercurial-cbor'
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61 res.setbodybytes(CACHE[key])
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62
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63 def cachedescriptor(req, repo):
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64 return {}
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65
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66 wireprotoserver.API_HANDLERS[b'simplecache'] = {
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67 b'config': (b'simplecache', b'cacheapi'),
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68 b'handler': handlecacherequest,
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69 b'apidescriptor': cachedescriptor,
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70 }
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71
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72 @interfaceutil.implementer(repository.iwireprotocolcommandcacher)
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73 class memorycacher(object):
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74 def __init__(self, ui, command, encodefn, redirecttargets, redirecthashes,
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75 req):
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76 self.ui = ui
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77 self.encodefn = encodefn
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78 self.redirecttargets = redirecttargets
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79 self.redirecthashes = redirecthashes
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80 self.req = req
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81 self.key = None
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82 self.cacheobjects = ui.configbool(b'simplecache', b'cacheobjects')
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83 self.cacheapi = ui.configbool(b'simplecache', b'cacheapi')
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84 self.buffered = []
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85
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86 ui.log(b'simplecache', b'cacher constructed for %s\n', command)
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87
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88 def __enter__(self):
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89 return self
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90
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91 def __exit__(self, exctype, excvalue, exctb):
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92 if exctype:
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93 self.ui.log(b'simplecache', b'cacher exiting due to error\n')
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94
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95 def adjustcachekeystate(self, state):
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96 # Needed in order to make tests deterministic. Don't copy this
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97 # pattern for production caches!
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98 del state[b'repo']
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99
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100 def setcachekey(self, key):
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101 self.key = key
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102 return True
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103
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104 def lookup(self):
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105 if self.key not in CACHE:
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106 self.ui.log(b'simplecache', b'cache miss for %s\n', self.key)
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107 return None
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108
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109 entry = CACHE[self.key]
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110 self.ui.log(b'simplecache', b'cache hit for %s\n', self.key)
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111
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112 redirectable = True
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113
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114 if not self.cacheapi:
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115 redirectable = False
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116 elif not self.redirecttargets:
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117 redirectable = False
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118 else:
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119 clienttargets = set(self.redirecttargets)
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120 ourtargets = set(t[b'name'] for t in loadredirecttargets(self.ui))
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121
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122 # We only ever redirect to a single target (for now). So we don't
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123 # need to store which target matched.
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124 if not clienttargets & ourtargets:
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125 redirectable = False
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126
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127 if redirectable:
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128 paths = self.req.dispatchparts[:-3]
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129 paths.append(b'simplecache')
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130 paths.append(self.key)
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131
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132 url = b'%s/%s' % (self.req.baseurl, b'/'.join(paths))
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133
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134 #url = b'http://example.com/%s' % self.key
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135 self.ui.log(b'simplecache', b'sending content redirect for %s to '
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136 b'%s\n', self.key, url)
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137 response = wireprototypes.alternatelocationresponse(
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138 url=url,
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139 mediatype=b'application/mercurial-cbor')
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140
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141 return {b'objs': [response]}
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142
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143 if self.cacheobjects:
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144 return {
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145 b'objs': entry,
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146 }
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147 else:
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148 return {
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149 b'objs': [wireprototypes.encodedresponse(entry)],
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150 }
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151
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152 def onobject(self, obj):
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153 if self.cacheobjects:
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154 self.buffered.append(obj)
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155 else:
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156 self.buffered.extend(self.encodefn(obj))
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157
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158 yield obj
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159
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160 def onfinished(self):
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161 self.ui.log(b'simplecache', b'storing cache entry for %s\n', self.key)
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162 if self.cacheobjects:
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163 CACHE[self.key] = self.buffered
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164 else:
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165 CACHE[self.key] = b''.join(self.buffered)
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166
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167 return []
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168
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169 def makeresponsecacher(orig, repo, proto, command, args, objencoderfn,
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170 redirecttargets, redirecthashes):
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171 return memorycacher(repo.ui, command, objencoderfn, redirecttargets,
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172 redirecthashes, proto._req)
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173
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174 def loadredirecttargets(ui):
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175 path = ui.config(b'simplecache', b'redirectsfile')
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176 if not path:
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177 return []
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178
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179 with open(path, 'rb') as fh:
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180 s = fh.read()
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181
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182 return stringutil.evalpythonliteral(s)
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183
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184 def getadvertisedredirecttargets(orig, repo, proto):
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185 return loadredirecttargets(repo.ui)
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186
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187 def extsetup(ui):
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188 global CACHE
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189
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190 CACHE = util.lrucachedict(10000)
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191
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192 extensions.wrapfunction(wireprotov2server, b'makeresponsecacher',
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193 makeresponsecacher)
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194 extensions.wrapfunction(wireprotov2server, b'getadvertisedredirecttargets',
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195 getadvertisedredirecttargets)