Mercurial > public > mercurial-scm > hg-stable
annotate hgext/remotefilelog/fileserverclient.py @ 40865:b34b1b865ef9
remotefilelog: avoid temporarily using "count" variable as synonym for "total"
The "count" variable is generally used for updating progress, but
early in fileserverclient.request(), its used to mean the total
count. We already have another "total" variable for that, so it seems
much clearer to use that.
Differential Revision: https://phab.mercurial-scm.org/D5382
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Tue, 04 Dec 2018 21:58:46 -0800 |
parents | e58cd7ede1c3 |
children | 70de33b9d328 |
rev | line source |
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1 # fileserverclient.py - client for communicating with the cache process |
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2 # |
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3 # Copyright 2013 Facebook, 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 |
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8 from __future__ import absolute_import |
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9 |
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10 import hashlib |
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11 import io |
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12 import os |
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13 import threading |
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14 import time |
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15 import zlib |
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16 |
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17 from mercurial.i18n import _ |
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18 from mercurial.node import bin, hex, nullid |
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19 from mercurial import ( |
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20 error, |
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21 node, |
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22 pycompat, |
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23 revlog, |
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24 sshpeer, |
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25 util, |
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26 wireprotov1peer, |
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27 ) |
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28 from mercurial.utils import procutil |
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29 |
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30 from . import ( |
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31 constants, |
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32 contentstore, |
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33 metadatastore, |
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34 ) |
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35 |
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36 _sshv1peer = sshpeer.sshv1peer |
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37 |
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38 # Statistics for debugging |
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39 fetchcost = 0 |
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40 fetches = 0 |
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41 fetched = 0 |
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42 fetchmisses = 0 |
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43 |
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44 _lfsmod = None |
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45 |
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46 def getcachekey(reponame, file, id): |
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47 pathhash = node.hex(hashlib.sha1(file).digest()) |
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48 return os.path.join(reponame, pathhash[:2], pathhash[2:], id) |
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49 |
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50 def getlocalkey(file, id): |
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51 pathhash = node.hex(hashlib.sha1(file).digest()) |
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52 return os.path.join(pathhash, id) |
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53 |
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54 def peersetup(ui, peer): |
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55 |
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56 class remotefilepeer(peer.__class__): |
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57 @wireprotov1peer.batchable |
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58 def x_rfl_getfile(self, file, node): |
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59 if not self.capable('x_rfl_getfile'): |
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60 raise error.Abort( |
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61 'configured remotefile server does not support getfile') |
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62 f = wireprotov1peer.future() |
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63 yield {'file': file, 'node': node}, f |
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64 code, data = f.value.split('\0', 1) |
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65 if int(code): |
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66 raise error.LookupError(file, node, data) |
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67 yield data |
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68 |
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69 @wireprotov1peer.batchable |
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70 def x_rfl_getflogheads(self, path): |
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71 if not self.capable('x_rfl_getflogheads'): |
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72 raise error.Abort('configured remotefile server does not ' |
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73 'support getflogheads') |
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74 f = wireprotov1peer.future() |
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75 yield {'path': path}, f |
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76 heads = f.value.split('\n') if f.value else [] |
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77 yield heads |
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78 |
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79 def _updatecallstreamopts(self, command, opts): |
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80 if command != 'getbundle': |
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81 return |
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82 if (constants.NETWORK_CAP_LEGACY_SSH_GETFILES |
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83 not in self.capabilities()): |
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84 return |
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85 if not util.safehasattr(self, '_localrepo'): |
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86 return |
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87 if (constants.SHALLOWREPO_REQUIREMENT |
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88 not in self._localrepo.requirements): |
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89 return |
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90 |
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91 bundlecaps = opts.get('bundlecaps') |
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92 if bundlecaps: |
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93 bundlecaps = [bundlecaps] |
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94 else: |
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95 bundlecaps = [] |
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96 |
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97 # shallow, includepattern, and excludepattern are a hacky way of |
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98 # carrying over data from the local repo to this getbundle |
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99 # command. We need to do it this way because bundle1 getbundle |
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100 # doesn't provide any other place we can hook in to manipulate |
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101 # getbundle args before it goes across the wire. Once we get rid |
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102 # of bundle1, we can use bundle2's _pullbundle2extraprepare to |
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103 # do this more cleanly. |
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104 bundlecaps.append(constants.BUNDLE2_CAPABLITY) |
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105 if self._localrepo.includepattern: |
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106 patterns = '\0'.join(self._localrepo.includepattern) |
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107 includecap = "includepattern=" + patterns |
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108 bundlecaps.append(includecap) |
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109 if self._localrepo.excludepattern: |
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110 patterns = '\0'.join(self._localrepo.excludepattern) |
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111 excludecap = "excludepattern=" + patterns |
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112 bundlecaps.append(excludecap) |
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113 opts['bundlecaps'] = ','.join(bundlecaps) |
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114 |
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115 def _sendrequest(self, command, args, **opts): |
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116 self._updatecallstreamopts(command, args) |
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117 return super(remotefilepeer, self)._sendrequest(command, args, |
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118 **opts) |
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119 |
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120 def _callstream(self, command, **opts): |
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121 supertype = super(remotefilepeer, self) |
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122 if not util.safehasattr(supertype, '_sendrequest'): |
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123 self._updatecallstreamopts(command, pycompat.byteskwargs(opts)) |
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124 return super(remotefilepeer, self)._callstream(command, **opts) |
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125 |
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126 peer.__class__ = remotefilepeer |
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127 |
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128 class cacheconnection(object): |
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129 """The connection for communicating with the remote cache. Performs |
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130 gets and sets by communicating with an external process that has the |
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131 cache-specific implementation. |
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132 """ |
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133 def __init__(self): |
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134 self.pipeo = self.pipei = self.pipee = None |
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135 self.subprocess = None |
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136 self.connected = False |
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137 |
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138 def connect(self, cachecommand): |
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139 if self.pipeo: |
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140 raise error.Abort(_("cache connection already open")) |
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141 self.pipei, self.pipeo, self.pipee, self.subprocess = \ |
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142 procutil.popen4(cachecommand) |
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143 self.connected = True |
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144 |
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145 def close(self): |
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146 def tryclose(pipe): |
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147 try: |
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148 pipe.close() |
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149 except Exception: |
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150 pass |
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151 if self.connected: |
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152 try: |
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153 self.pipei.write("exit\n") |
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154 except Exception: |
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155 pass |
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156 tryclose(self.pipei) |
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157 self.pipei = None |
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158 tryclose(self.pipeo) |
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159 self.pipeo = None |
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160 tryclose(self.pipee) |
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161 self.pipee = None |
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162 try: |
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163 # Wait for process to terminate, making sure to avoid deadlock. |
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164 # See https://docs.python.org/2/library/subprocess.html for |
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165 # warnings about wait() and deadlocking. |
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166 self.subprocess.communicate() |
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167 except Exception: |
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168 pass |
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169 self.subprocess = None |
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170 self.connected = False |
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171 |
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172 def request(self, request, flush=True): |
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173 if self.connected: |
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174 try: |
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175 self.pipei.write(request) |
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176 if flush: |
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177 self.pipei.flush() |
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178 except IOError: |
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179 self.close() |
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180 |
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181 def receiveline(self): |
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182 if not self.connected: |
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183 return None |
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184 try: |
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185 result = self.pipeo.readline()[:-1] |
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186 if not result: |
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187 self.close() |
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188 except IOError: |
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189 self.close() |
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190 |
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191 return result |
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192 |
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193 def _getfilesbatch( |
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194 remote, receivemissing, progresstick, missed, idmap, batchsize): |
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195 # Over http(s), iterbatch is a streamy method and we can start |
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196 # looking at results early. This means we send one (potentially |
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197 # large) request, but then we show nice progress as we process |
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198 # file results, rather than showing chunks of $batchsize in |
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199 # progress. |
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200 # |
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201 # Over ssh, iterbatch isn't streamy because batch() wasn't |
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202 # explicitly designed as a streaming method. In the future we |
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203 # should probably introduce a streambatch() method upstream and |
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204 # use that for this. |
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205 with remote.commandexecutor() as e: |
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206 futures = [] |
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207 for m in missed: |
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208 futures.append(e.callcommand('x_rfl_getfile', { |
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209 'file': idmap[m], |
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210 'node': m[-40:] |
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211 })) |
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212 |
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213 for i, m in enumerate(missed): |
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214 r = futures[i].result() |
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215 futures[i] = None # release memory |
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216 file_ = idmap[m] |
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217 node = m[-40:] |
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218 receivemissing(io.BytesIO('%d\n%s' % (len(r), r)), file_, node) |
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219 progresstick() |
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220 |
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221 def _getfiles_optimistic( |
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222 remote, receivemissing, progresstick, missed, idmap, step): |
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223 remote._callstream("x_rfl_getfiles") |
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224 i = 0 |
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225 pipeo = remote._pipeo |
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226 pipei = remote._pipei |
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227 while i < len(missed): |
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228 # issue a batch of requests |
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229 start = i |
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230 end = min(len(missed), start + step) |
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231 i = end |
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232 for missingid in missed[start:end]: |
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233 # issue new request |
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234 versionid = missingid[-40:] |
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235 file = idmap[missingid] |
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236 sshrequest = "%s%s\n" % (versionid, file) |
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237 pipeo.write(sshrequest) |
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238 pipeo.flush() |
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239 |
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240 # receive batch results |
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241 for missingid in missed[start:end]: |
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242 versionid = missingid[-40:] |
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243 file = idmap[missingid] |
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244 receivemissing(pipei, file, versionid) |
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245 progresstick() |
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246 |
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247 # End the command |
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248 pipeo.write('\n') |
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249 pipeo.flush() |
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250 |
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251 def _getfiles_threaded( |
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252 remote, receivemissing, progresstick, missed, idmap, step): |
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253 remote._callstream("getfiles") |
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254 pipeo = remote._pipeo |
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255 pipei = remote._pipei |
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256 |
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257 def writer(): |
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258 for missingid in missed: |
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259 versionid = missingid[-40:] |
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260 file = idmap[missingid] |
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261 sshrequest = "%s%s\n" % (versionid, file) |
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262 pipeo.write(sshrequest) |
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263 pipeo.flush() |
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264 writerthread = threading.Thread(target=writer) |
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265 writerthread.daemon = True |
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266 writerthread.start() |
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267 |
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268 for missingid in missed: |
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269 versionid = missingid[-40:] |
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270 file = idmap[missingid] |
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271 receivemissing(pipei, file, versionid) |
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272 progresstick() |
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273 |
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274 writerthread.join() |
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275 # End the command |
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276 pipeo.write('\n') |
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277 pipeo.flush() |
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278 |
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279 class fileserverclient(object): |
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280 """A client for requesting files from the remote file server. |
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281 """ |
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282 def __init__(self, repo): |
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283 ui = repo.ui |
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284 self.repo = repo |
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285 self.ui = ui |
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286 self.cacheprocess = ui.config("remotefilelog", "cacheprocess") |
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287 if self.cacheprocess: |
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288 self.cacheprocess = util.expandpath(self.cacheprocess) |
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289 |
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290 # This option causes remotefilelog to pass the full file path to the |
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291 # cacheprocess instead of a hashed key. |
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292 self.cacheprocesspasspath = ui.configbool( |
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293 "remotefilelog", "cacheprocess.includepath") |
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294 |
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295 self.debugoutput = ui.configbool("remotefilelog", "debug") |
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296 |
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297 self.remotecache = cacheconnection() |
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298 |
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299 def setstore(self, datastore, historystore, writedata, writehistory): |
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300 self.datastore = datastore |
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301 self.historystore = historystore |
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302 self.writedata = writedata |
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303 self.writehistory = writehistory |
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304 |
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305 def _connect(self): |
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306 return self.repo.connectionpool.get(self.repo.fallbackpath) |
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307 |
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308 def request(self, fileids): |
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309 """Takes a list of filename/node pairs and fetches them from the |
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310 server. Files are stored in the local cache. |
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311 A list of nodes that the server couldn't find is returned. |
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312 If the connection fails, an exception is raised. |
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313 """ |
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314 if not self.remotecache.connected: |
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315 self.connect() |
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316 cache = self.remotecache |
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317 writedata = self.writedata |
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318 |
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319 repo = self.repo |
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320 total = len(fileids) |
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321 request = "get\n%d\n" % total |
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322 idmap = {} |
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323 reponame = repo.name |
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324 for file, id in fileids: |
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325 fullid = getcachekey(reponame, file, id) |
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326 if self.cacheprocesspasspath: |
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327 request += file + '\0' |
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328 request += fullid + "\n" |
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329 idmap[fullid] = file |
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330 |
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331 cache.request(request) |
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332 |
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333 progress = self.ui.makeprogress(_('downloading'), total=total) |
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334 progress.update(0) |
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335 |
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336 missed = [] |
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337 count = 0 |
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338 while True: |
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339 missingid = cache.receiveline() |
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340 if not missingid: |
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341 missedset = set(missed) |
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342 for missingid in idmap: |
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343 if not missingid in missedset: |
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344 missed.append(missingid) |
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345 self.ui.warn(_("warning: cache connection closed early - " + |
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346 "falling back to server\n")) |
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347 break |
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348 if missingid == "0": |
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349 break |
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350 if missingid.startswith("_hits_"): |
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351 # receive progress reports |
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352 parts = missingid.split("_") |
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353 count += int(parts[2]) |
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354 progress.update(count) |
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355 continue |
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356 |
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357 missed.append(missingid) |
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358 |
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359 global fetchmisses |
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360 fetchmisses += len(missed) |
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361 |
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362 count = [total - len(missed)] |
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363 fromcache = count[0] |
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364 progress.update(count[0], total=total) |
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365 self.ui.log("remotefilelog", "remote cache hit rate is %r of %r\n", |
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366 count[0], total, hit=count[0], total=total) |
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367 |
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368 oldumask = os.umask(0o002) |
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369 try: |
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370 # receive cache misses from master |
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371 if missed: |
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372 def progresstick(): |
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373 count[0] += 1 |
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374 progress.update(count[0]) |
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375 # When verbose is true, sshpeer prints 'running ssh...' |
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376 # to stdout, which can interfere with some command |
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377 # outputs |
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378 verbose = self.ui.verbose |
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379 self.ui.verbose = False |
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380 try: |
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381 with self._connect() as conn: |
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382 remote = conn.peer |
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383 if remote.capable( |
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384 constants.NETWORK_CAP_LEGACY_SSH_GETFILES): |
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385 if not isinstance(remote, _sshv1peer): |
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386 raise error.Abort('remotefilelog requires ssh ' |
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387 'servers') |
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388 step = self.ui.configint('remotefilelog', |
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389 'getfilesstep') |
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390 getfilestype = self.ui.config('remotefilelog', |
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391 'getfilestype') |
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392 if getfilestype == 'threaded': |
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393 _getfiles = _getfiles_threaded |
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394 else: |
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395 _getfiles = _getfiles_optimistic |
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396 _getfiles(remote, self.receivemissing, progresstick, |
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397 missed, idmap, step) |
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398 elif remote.capable("x_rfl_getfile"): |
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399 if remote.capable('batch'): |
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400 batchdefault = 100 |
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401 else: |
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402 batchdefault = 10 |
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403 batchsize = self.ui.configint( |
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404 'remotefilelog', 'batchsize', batchdefault) |
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405 _getfilesbatch( |
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406 remote, self.receivemissing, progresstick, |
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407 missed, idmap, batchsize) |
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408 else: |
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409 raise error.Abort("configured remotefilelog server" |
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410 " does not support remotefilelog") |
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411 |
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412 self.ui.log("remotefilefetchlog", |
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413 "Success\n", |
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414 fetched_files = count[0] - fromcache, |
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415 total_to_fetch = total - fromcache) |
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416 except Exception: |
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417 self.ui.log("remotefilefetchlog", |
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418 "Fail\n", |
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419 fetched_files = count[0] - fromcache, |
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420 total_to_fetch = total - fromcache) |
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421 raise |
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422 finally: |
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423 self.ui.verbose = verbose |
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424 # send to memcache |
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425 count[0] = len(missed) |
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426 request = "set\n%d\n%s\n" % (count[0], "\n".join(missed)) |
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427 cache.request(request) |
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428 |
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429 progress.complete() |
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430 |
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431 # mark ourselves as a user of this cache |
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432 writedata.markrepo(self.repo.path) |
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433 finally: |
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434 os.umask(oldumask) |
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435 |
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436 def receivemissing(self, pipe, filename, node): |
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437 line = pipe.readline()[:-1] |
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438 if not line: |
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439 raise error.ResponseError(_("error downloading file contents:"), |
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440 _("connection closed early")) |
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441 size = int(line) |
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442 data = pipe.read(size) |
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443 if len(data) != size: |
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444 raise error.ResponseError(_("error downloading file contents:"), |
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445 _("only received %s of %s bytes") |
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446 % (len(data), size)) |
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447 |
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448 self.writedata.addremotefilelognode(filename, bin(node), |
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449 zlib.decompress(data)) |
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450 |
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451 def connect(self): |
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452 if self.cacheprocess: |
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453 cmd = "%s %s" % (self.cacheprocess, self.writedata._path) |
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454 self.remotecache.connect(cmd) |
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455 else: |
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456 # If no cache process is specified, we fake one that always |
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457 # returns cache misses. This enables tests to run easily |
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458 # and may eventually allow us to be a drop in replacement |
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459 # for the largefiles extension. |
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460 class simplecache(object): |
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461 def __init__(self): |
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462 self.missingids = [] |
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463 self.connected = True |
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464 |
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465 def close(self): |
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466 pass |
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467 |
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468 def request(self, value, flush=True): |
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469 lines = value.split("\n") |
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470 if lines[0] != "get": |
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471 return |
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472 self.missingids = lines[2:-1] |
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473 self.missingids.append('0') |
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474 |
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475 def receiveline(self): |
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476 if len(self.missingids) > 0: |
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477 return self.missingids.pop(0) |
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478 return None |
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479 |
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480 self.remotecache = simplecache() |
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481 |
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482 def close(self): |
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483 if fetches: |
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484 msg = ("%d files fetched over %d fetches - " + |
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485 "(%d misses, %0.2f%% hit ratio) over %0.2fs\n") % ( |
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486 fetched, |
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487 fetches, |
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488 fetchmisses, |
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489 float(fetched - fetchmisses) / float(fetched) * 100.0, |
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490 fetchcost) |
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491 if self.debugoutput: |
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492 self.ui.warn(msg) |
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493 self.ui.log("remotefilelog.prefetch", msg.replace("%", "%%"), |
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494 remotefilelogfetched=fetched, |
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495 remotefilelogfetches=fetches, |
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496 remotefilelogfetchmisses=fetchmisses, |
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497 remotefilelogfetchtime=fetchcost * 1000) |
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498 |
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499 if self.remotecache.connected: |
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500 self.remotecache.close() |
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501 |
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502 def prefetch(self, fileids, force=False, fetchdata=True, |
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503 fetchhistory=False): |
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504 """downloads the given file versions to the cache |
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505 """ |
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506 repo = self.repo |
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507 idstocheck = [] |
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508 for file, id in fileids: |
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509 # hack |
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510 # - we don't use .hgtags |
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511 # - workingctx produces ids with length 42, |
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512 # which we skip since they aren't in any cache |
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513 if (file == '.hgtags' or len(id) == 42 |
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514 or not repo.shallowmatch(file)): |
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515 continue |
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|
516 |
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517 idstocheck.append((file, bin(id))) |
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518 |
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519 datastore = self.datastore |
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520 historystore = self.historystore |
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521 if force: |
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522 datastore = contentstore.unioncontentstore(*repo.shareddatastores) |
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523 historystore = metadatastore.unionmetadatastore( |
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524 *repo.sharedhistorystores) |
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525 |
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526 missingids = set() |
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527 if fetchdata: |
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528 missingids.update(datastore.getmissing(idstocheck)) |
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529 if fetchhistory: |
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530 missingids.update(historystore.getmissing(idstocheck)) |
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|
531 |
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|
532 # partition missing nodes into nullid and not-nullid so we can |
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533 # warn about this filtering potentially shadowing bugs. |
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534 nullids = len([None for unused, id in missingids if id == nullid]) |
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535 if nullids: |
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536 missingids = [(f, id) for f, id in missingids if id != nullid] |
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|
537 repo.ui.develwarn( |
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|
538 ('remotefilelog not fetching %d null revs' |
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|
539 ' - this is likely hiding bugs' % nullids), |
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|
540 config='remotefilelog-ext') |
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|
541 if missingids: |
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Augie Fackler <augie@google.com>
parents:
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542 global fetches, fetched, fetchcost |
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543 fetches += 1 |
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544 |
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545 # We want to be able to detect excess individual file downloads, so |
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546 # let's log that information for debugging. |
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547 if fetches >= 15 and fetches < 18: |
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548 if fetches == 15: |
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549 fetchwarning = self.ui.config('remotefilelog', |
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550 'fetchwarning') |
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551 if fetchwarning: |
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552 self.ui.warn(fetchwarning + '\n') |
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553 self.logstacktrace() |
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554 missingids = [(file, hex(id)) for file, id in missingids] |
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555 fetched += len(missingids) |
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556 start = time.time() |
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557 missingids = self.request(missingids) |
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558 if missingids: |
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559 raise error.Abort(_("unable to download %d files") % |
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560 len(missingids)) |
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561 fetchcost += time.time() - start |
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562 self._lfsprefetch(fileids) |
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563 |
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564 def _lfsprefetch(self, fileids): |
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565 if not _lfsmod or not util.safehasattr( |
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566 self.repo.svfs, 'lfslocalblobstore'): |
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567 return |
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568 if not _lfsmod.wrapper.candownload(self.repo): |
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569 return |
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570 pointers = [] |
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571 store = self.repo.svfs.lfslocalblobstore |
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572 for file, id in fileids: |
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573 node = bin(id) |
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574 rlog = self.repo.file(file) |
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575 if rlog.flags(node) & revlog.REVIDX_EXTSTORED: |
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576 text = rlog.revision(node, raw=True) |
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577 p = _lfsmod.pointer.deserialize(text) |
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578 oid = p.oid() |
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579 if not store.has(oid): |
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580 pointers.append(p) |
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581 if len(pointers) > 0: |
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582 self.repo.svfs.lfsremoteblobstore.readbatch(pointers, store) |
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583 assert all(store.has(p.oid()) for p in pointers) |
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584 |
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585 def logstacktrace(self): |
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586 import traceback |
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587 self.ui.log('remotefilelog', 'excess remotefilelog fetching:\n%s\n', |
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588 ''.join(traceback.format_stack())) |