Mercurial > hg
annotate hgext/remotefilelog/fileserverclient.py @ 51535:03247e37ccf7
branchcache: move the processing of the new data in a dedicated method
In a future changeset, this will allow the V3 of the branch cache to use a fast
path when possible.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 06 Mar 2024 16:18:03 +0100 |
parents | 1625fe807c04 |
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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 |
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9 import io |
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10 import os |
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11 import threading |
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12 import time |
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13 import zlib |
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14 |
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15 from mercurial.i18n import _ |
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16 from mercurial.node import bin, hex |
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17 from mercurial import ( |
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18 error, |
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19 pycompat, |
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20 revlog, |
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21 sshpeer, |
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22 util, |
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23 wireprotov1peer, |
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24 ) |
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25 from mercurial.utils import ( |
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26 hashutil, |
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27 procutil, |
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28 ) |
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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 |
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47 def getcachekey(reponame, file, id): |
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48 pathhash = hex(hashutil.sha1(file).digest()) |
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49 return os.path.join(reponame, pathhash[:2], pathhash[2:], id) |
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50 |
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51 |
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52 def getlocalkey(file, id): |
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53 pathhash = hex(hashutil.sha1(file).digest()) |
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54 return os.path.join(pathhash, id) |
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55 |
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56 |
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57 def peersetup(ui, peer): |
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58 class remotefilepeer(peer.__class__): |
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59 @wireprotov1peer.batchable |
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60 def x_rfl_getfile(self, file, node): |
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61 if not self.capable(b'x_rfl_getfile'): |
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62 raise error.Abort( |
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63 b'configured remotefile server does not support getfile' |
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64 ) |
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65 |
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66 def decode(d): |
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67 code, data = d.split(b'\0', 1) |
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68 if int(code): |
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69 raise error.LookupError(file, node, data) |
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70 return data |
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71 |
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72 return {b'file': file, b'node': node}, decode |
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73 |
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74 @wireprotov1peer.batchable |
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75 def x_rfl_getflogheads(self, path): |
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76 if not self.capable(b'x_rfl_getflogheads'): |
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77 raise error.Abort( |
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78 b'configured remotefile server does not ' |
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79 b'support getflogheads' |
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80 ) |
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81 |
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82 def decode(d): |
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83 return d.split(b'\n') if d else [] |
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84 |
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85 return {b'path': path}, decode |
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86 |
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87 def _updatecallstreamopts(self, command, opts): |
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88 if command != b'getbundle': |
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89 return |
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90 if ( |
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91 constants.NETWORK_CAP_LEGACY_SSH_GETFILES |
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92 not in self.capabilities() |
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93 ): |
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94 return |
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95 if not hasattr(self, '_localrepo'): |
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96 return |
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97 if ( |
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98 constants.SHALLOWREPO_REQUIREMENT |
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99 not in self._localrepo.requirements |
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100 ): |
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101 return |
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102 |
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103 bundlecaps = opts.get(b'bundlecaps') |
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104 if bundlecaps: |
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105 bundlecaps = [bundlecaps] |
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106 else: |
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107 bundlecaps = [] |
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108 |
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109 # shallow, includepattern, and excludepattern are a hacky way of |
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110 # carrying over data from the local repo to this getbundle |
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111 # command. We need to do it this way because bundle1 getbundle |
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112 # doesn't provide any other place we can hook in to manipulate |
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113 # getbundle args before it goes across the wire. Once we get rid |
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114 # of bundle1, we can use bundle2's _pullbundle2extraprepare to |
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115 # do this more cleanly. |
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116 bundlecaps.append(constants.BUNDLE2_CAPABLITY) |
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117 if self._localrepo.includepattern: |
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118 patterns = b'\0'.join(self._localrepo.includepattern) |
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119 includecap = b"includepattern=" + patterns |
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120 bundlecaps.append(includecap) |
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121 if self._localrepo.excludepattern: |
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122 patterns = b'\0'.join(self._localrepo.excludepattern) |
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123 excludecap = b"excludepattern=" + patterns |
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124 bundlecaps.append(excludecap) |
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125 opts[b'bundlecaps'] = b','.join(bundlecaps) |
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126 |
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127 def _sendrequest(self, command, args, **opts): |
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128 self._updatecallstreamopts(command, args) |
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129 return super(remotefilepeer, self)._sendrequest( |
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130 command, args, **opts |
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131 ) |
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132 |
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133 def _callstream(self, command, **opts): |
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134 supertype = super(remotefilepeer, self) |
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135 if not hasattr(supertype, '_sendrequest'): |
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136 self._updatecallstreamopts(command, pycompat.byteskwargs(opts)) |
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137 return super(remotefilepeer, self)._callstream(command, **opts) |
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138 |
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139 peer.__class__ = remotefilepeer |
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140 |
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141 |
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142 class cacheconnection: |
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143 """The connection for communicating with the remote cache. Performs |
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144 gets and sets by communicating with an external process that has the |
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145 cache-specific implementation. |
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146 """ |
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147 |
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148 def __init__(self): |
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149 self.pipeo = self.pipei = self.pipee = None |
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150 self.subprocess = None |
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151 self.connected = False |
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152 |
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153 def connect(self, cachecommand): |
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154 if self.pipeo: |
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155 raise error.Abort(_(b"cache connection already open")) |
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156 self.pipei, self.pipeo, self.pipee, self.subprocess = procutil.popen4( |
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157 cachecommand |
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158 ) |
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159 self.connected = True |
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160 |
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161 def close(self): |
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162 def tryclose(pipe): |
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163 try: |
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164 pipe.close() |
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165 except Exception: |
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166 pass |
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167 |
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168 if self.connected: |
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169 try: |
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170 self.pipei.write(b"exit\n") |
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171 except Exception: |
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172 pass |
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173 tryclose(self.pipei) |
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174 self.pipei = None |
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175 tryclose(self.pipeo) |
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176 self.pipeo = None |
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177 tryclose(self.pipee) |
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178 self.pipee = None |
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179 try: |
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180 # Wait for process to terminate, making sure to avoid deadlock. |
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181 # See https://docs.python.org/2/library/subprocess.html for |
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182 # warnings about wait() and deadlocking. |
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183 self.subprocess.communicate() |
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184 except Exception: |
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185 pass |
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186 self.subprocess = None |
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187 self.connected = False |
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188 |
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189 def request(self, request, flush=True): |
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190 if self.connected: |
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191 try: |
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192 self.pipei.write(request) |
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193 if flush: |
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194 self.pipei.flush() |
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195 except IOError: |
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196 self.close() |
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197 |
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198 def receiveline(self): |
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199 if not self.connected: |
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200 return None |
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201 try: |
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202 result = self.pipeo.readline()[:-1] |
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203 if not result: |
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204 self.close() |
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205 except IOError: |
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206 self.close() |
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207 |
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208 return result |
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209 |
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210 |
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211 def _getfilesbatch( |
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212 remote, receivemissing, progresstick, missed, idmap, batchsize |
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213 ): |
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214 # Over http(s), iterbatch is a streamy method and we can start |
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215 # looking at results early. This means we send one (potentially |
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216 # large) request, but then we show nice progress as we process |
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217 # file results, rather than showing chunks of $batchsize in |
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218 # progress. |
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219 # |
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220 # Over ssh, iterbatch isn't streamy because batch() wasn't |
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221 # explicitly designed as a streaming method. In the future we |
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222 # should probably introduce a streambatch() method upstream and |
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223 # use that for this. |
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224 with remote.commandexecutor() as e: |
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225 futures = [] |
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226 for m in missed: |
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227 futures.append( |
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228 e.callcommand( |
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229 b'x_rfl_getfile', {b'file': idmap[m], b'node': m[-40:]} |
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230 ) |
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231 ) |
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232 |
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233 for i, m in enumerate(missed): |
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234 r = futures[i].result() |
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235 futures[i] = None # release memory |
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236 file_ = idmap[m] |
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237 node = m[-40:] |
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238 receivemissing(io.BytesIO(b'%d\n%s' % (len(r), r)), file_, node) |
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239 progresstick() |
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240 |
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241 |
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242 def _getfiles_optimistic( |
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243 remote, receivemissing, progresstick, missed, idmap, step |
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244 ): |
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245 remote._callstream(b"x_rfl_getfiles") |
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246 i = 0 |
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247 pipeo = remote._pipeo |
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248 pipei = remote._pipei |
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249 while i < len(missed): |
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250 # issue a batch of requests |
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251 start = i |
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252 end = min(len(missed), start + step) |
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253 i = end |
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254 for missingid in missed[start:end]: |
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255 # issue new request |
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256 versionid = missingid[-40:] |
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257 file = idmap[missingid] |
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258 sshrequest = b"%s%s\n" % (versionid, file) |
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259 pipeo.write(sshrequest) |
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260 pipeo.flush() |
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261 |
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262 # receive batch results |
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263 for missingid in missed[start:end]: |
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264 versionid = missingid[-40:] |
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265 file = idmap[missingid] |
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266 receivemissing(pipei, file, versionid) |
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267 progresstick() |
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268 |
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269 # End the command |
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270 pipeo.write(b'\n') |
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271 pipeo.flush() |
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272 |
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273 |
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274 def _getfiles_threaded( |
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275 remote, receivemissing, progresstick, missed, idmap, step |
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276 ): |
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277 remote._callstream(b"x_rfl_getfiles") |
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278 pipeo = remote._pipeo |
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279 pipei = remote._pipei |
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280 |
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281 def writer(): |
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282 for missingid in missed: |
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283 versionid = missingid[-40:] |
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284 file = idmap[missingid] |
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285 sshrequest = b"%s%s\n" % (versionid, file) |
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286 pipeo.write(sshrequest) |
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287 pipeo.flush() |
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288 |
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289 writerthread = threading.Thread(target=writer) |
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290 writerthread.daemon = True |
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291 writerthread.start() |
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292 |
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293 for missingid in missed: |
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294 versionid = missingid[-40:] |
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295 file = idmap[missingid] |
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296 receivemissing(pipei, file, versionid) |
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297 progresstick() |
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298 |
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299 writerthread.join() |
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300 # End the command |
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301 pipeo.write(b'\n') |
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302 pipeo.flush() |
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303 |
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304 |
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305 class fileserverclient: |
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306 """A client for requesting files from the remote file server.""" |
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307 |
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308 def __init__(self, repo): |
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309 ui = repo.ui |
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310 self.repo = repo |
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311 self.ui = ui |
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312 self.cacheprocess = ui.config(b"remotefilelog", b"cacheprocess") |
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313 if self.cacheprocess: |
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314 self.cacheprocess = util.expandpath(self.cacheprocess) |
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315 |
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316 # This option causes remotefilelog to pass the full file path to the |
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317 # cacheprocess instead of a hashed key. |
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318 self.cacheprocesspasspath = ui.configbool( |
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319 b"remotefilelog", b"cacheprocess.includepath" |
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320 ) |
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321 |
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322 self.debugoutput = ui.configbool(b"remotefilelog", b"debug") |
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323 |
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324 self.remotecache = cacheconnection() |
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325 |
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326 def setstore(self, datastore, historystore, writedata, writehistory): |
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327 self.datastore = datastore |
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328 self.historystore = historystore |
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329 self.writedata = writedata |
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330 self.writehistory = writehistory |
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331 |
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332 def _connect(self): |
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333 return self.repo.connectionpool.get(self.repo.fallbackpath) |
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334 |
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335 def request(self, fileids): |
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336 """Takes a list of filename/node pairs and fetches them from the |
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337 server. Files are stored in the local cache. |
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338 A list of nodes that the server couldn't find is returned. |
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339 If the connection fails, an exception is raised. |
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340 """ |
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341 if not self.remotecache.connected: |
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342 self.connect() |
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343 cache = self.remotecache |
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344 writedata = self.writedata |
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345 |
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346 repo = self.repo |
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347 total = len(fileids) |
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348 request = b"get\n%d\n" % total |
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349 idmap = {} |
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350 reponame = repo.name |
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351 for file, id in fileids: |
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352 fullid = getcachekey(reponame, file, id) |
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353 if self.cacheprocesspasspath: |
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354 request += file + b'\0' |
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355 request += fullid + b"\n" |
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356 idmap[fullid] = file |
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357 |
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358 cache.request(request) |
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359 |
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360 progress = self.ui.makeprogress(_(b'downloading'), total=total) |
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361 progress.update(0) |
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362 |
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363 missed = [] |
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364 while True: |
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365 missingid = cache.receiveline() |
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366 if not missingid: |
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367 missedset = set(missed) |
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368 for missingid in idmap: |
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369 if not missingid in missedset: |
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370 missed.append(missingid) |
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371 self.ui.warn( |
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372 _( |
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373 b"warning: cache connection closed early - " |
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374 + b"falling back to server\n" |
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375 ) |
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376 ) |
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377 break |
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378 if missingid == b"0": |
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379 break |
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380 if missingid.startswith(b"_hits_"): |
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381 # receive progress reports |
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382 parts = missingid.split(b"_") |
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383 progress.increment(int(parts[2])) |
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384 continue |
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385 |
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386 missed.append(missingid) |
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387 |
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388 global fetchmisses |
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389 fetchmisses += len(missed) |
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390 |
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391 fromcache = total - len(missed) |
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392 progress.update(fromcache, total=total) |
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393 self.ui.log( |
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394 b"remotefilelog", |
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395 b"remote cache hit rate is %r of %r\n", |
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396 fromcache, |
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397 total, |
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398 hit=fromcache, |
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399 total=total, |
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400 ) |
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401 |
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402 oldumask = os.umask(0o002) |
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403 try: |
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404 # receive cache misses from master |
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405 if missed: |
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406 # When verbose is true, sshpeer prints 'running ssh...' |
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407 # to stdout, which can interfere with some command |
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408 # outputs |
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409 verbose = self.ui.verbose |
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410 self.ui.verbose = False |
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411 try: |
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412 with self._connect() as conn: |
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413 remote = conn.peer |
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414 if remote.capable( |
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415 constants.NETWORK_CAP_LEGACY_SSH_GETFILES |
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416 ): |
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417 if not isinstance(remote, _sshv1peer): |
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418 raise error.Abort( |
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419 b'remotefilelog requires ssh servers' |
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420 ) |
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421 step = self.ui.configint( |
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422 b'remotefilelog', b'getfilesstep' |
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423 ) |
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424 getfilestype = self.ui.config( |
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425 b'remotefilelog', b'getfilestype' |
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426 ) |
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427 if getfilestype == b'threaded': |
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428 _getfiles = _getfiles_threaded |
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429 else: |
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430 _getfiles = _getfiles_optimistic |
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431 _getfiles( |
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432 remote, |
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433 self.receivemissing, |
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434 progress.increment, |
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435 missed, |
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436 idmap, |
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437 step, |
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438 ) |
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439 elif remote.capable(b"x_rfl_getfile"): |
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440 if remote.capable(b'batch'): |
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441 batchdefault = 100 |
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442 else: |
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443 batchdefault = 10 |
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444 batchsize = self.ui.configint( |
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445 b'remotefilelog', b'batchsize', batchdefault |
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446 ) |
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447 self.ui.debug( |
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448 b'requesting %d files from ' |
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449 b'remotefilelog server...\n' % len(missed) |
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450 ) |
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451 _getfilesbatch( |
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452 remote, |
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453 self.receivemissing, |
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454 progress.increment, |
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455 missed, |
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456 idmap, |
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457 batchsize, |
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458 ) |
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459 else: |
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460 raise error.Abort( |
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461 b"configured remotefilelog server" |
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462 b" does not support remotefilelog" |
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463 ) |
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464 |
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465 self.ui.log( |
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466 b"remotefilefetchlog", |
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467 b"Success\n", |
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468 fetched_files=progress.pos - fromcache, |
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469 total_to_fetch=total - fromcache, |
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470 ) |
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471 except Exception: |
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472 self.ui.log( |
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473 b"remotefilefetchlog", |
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474 b"Fail\n", |
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475 fetched_files=progress.pos - fromcache, |
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476 total_to_fetch=total - fromcache, |
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477 ) |
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478 raise |
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479 finally: |
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480 self.ui.verbose = verbose |
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481 # send to memcache |
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482 request = b"set\n%d\n%s\n" % (len(missed), b"\n".join(missed)) |
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483 cache.request(request) |
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484 |
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485 progress.complete() |
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486 |
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487 # mark ourselves as a user of this cache |
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488 writedata.markrepo(self.repo.path) |
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489 finally: |
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490 os.umask(oldumask) |
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491 |
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492 def receivemissing(self, pipe, filename, node): |
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493 line = pipe.readline()[:-1] |
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494 if not line: |
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495 raise error.ResponseError( |
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496 _(b"error downloading file contents:"), |
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497 _(b"connection closed early"), |
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498 ) |
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499 size = int(line) |
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500 data = pipe.read(size) |
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501 if len(data) != size: |
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502 raise error.ResponseError( |
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503 _(b"error downloading file contents:"), |
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504 _(b"only received %s of %s bytes") % (len(data), size), |
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505 ) |
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506 |
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507 self.writedata.addremotefilelognode( |
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508 filename, bin(node), zlib.decompress(data) |
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509 ) |
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510 |
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511 def connect(self): |
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512 if self.cacheprocess: |
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513 cmd = b"%s %s" % (self.cacheprocess, self.writedata._path) |
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514 self.remotecache.connect(cmd) |
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515 else: |
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516 # If no cache process is specified, we fake one that always |
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517 # returns cache misses. This enables tests to run easily |
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518 # and may eventually allow us to be a drop in replacement |
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519 # for the largefiles extension. |
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520 class simplecache: |
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521 def __init__(self): |
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522 self.missingids = [] |
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523 self.connected = True |
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524 |
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525 def close(self): |
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526 pass |
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527 |
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528 def request(self, value, flush=True): |
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529 lines = value.split(b"\n") |
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530 if lines[0] != b"get": |
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531 return |
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532 self.missingids = lines[2:-1] |
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533 self.missingids.append(b'0') |
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534 |
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535 def receiveline(self): |
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536 if len(self.missingids) > 0: |
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537 return self.missingids.pop(0) |
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538 return None |
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539 |
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540 self.remotecache = simplecache() |
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541 |
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542 def close(self): |
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543 if fetches: |
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544 msg = ( |
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545 b"%d files fetched over %d fetches - " |
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546 + b"(%d misses, %0.2f%% hit ratio) over %0.2fs\n" |
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547 ) % ( |
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548 fetched, |
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549 fetches, |
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550 fetchmisses, |
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551 float(fetched - fetchmisses) / float(fetched) * 100.0, |
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552 fetchcost, |
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553 ) |
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554 if self.debugoutput: |
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555 self.ui.warn(msg) |
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556 self.ui.log( |
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557 b"remotefilelog.prefetch", |
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558 msg.replace(b"%", b"%%"), |
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559 remotefilelogfetched=fetched, |
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560 remotefilelogfetches=fetches, |
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561 remotefilelogfetchmisses=fetchmisses, |
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562 remotefilelogfetchtime=fetchcost * 1000, |
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563 ) |
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564 |
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565 if self.remotecache.connected: |
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566 self.remotecache.close() |
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567 |
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568 def prefetch( |
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569 self, fileids, force=False, fetchdata=True, fetchhistory=False |
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570 ): |
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571 """downloads the given file versions to the cache""" |
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572 repo = self.repo |
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573 idstocheck = [] |
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574 for file, id in fileids: |
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575 # hack |
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576 # - we don't use .hgtags |
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577 # - workingctx produces ids with length 42, |
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578 # which we skip since they aren't in any cache |
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579 if ( |
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580 file == b'.hgtags' |
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581 or len(id) == 42 |
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582 or not repo.shallowmatch(file) |
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583 ): |
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584 continue |
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585 |
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586 idstocheck.append((file, bin(id))) |
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587 |
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588 datastore = self.datastore |
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589 historystore = self.historystore |
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590 if force: |
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591 datastore = contentstore.unioncontentstore(*repo.shareddatastores) |
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592 historystore = metadatastore.unionmetadatastore( |
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593 *repo.sharedhistorystores |
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594 ) |
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595 |
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596 missingids = set() |
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597 if fetchdata: |
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598 missingids.update(datastore.getmissing(idstocheck)) |
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599 if fetchhistory: |
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600 missingids.update(historystore.getmissing(idstocheck)) |
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601 |
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602 # partition missing nodes into nullid and not-nullid so we can |
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603 # warn about this filtering potentially shadowing bugs. |
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604 nullids = len( |
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605 [None for unused, id in missingids if id == self.repo.nullid] |
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606 ) |
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607 if nullids: |
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608 missingids = [ |
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609 (f, id) for f, id in missingids if id != self.repo.nullid |
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610 ] |
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611 repo.ui.develwarn( |
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612 ( |
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613 b'remotefilelog not fetching %d null revs' |
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614 b' - this is likely hiding bugs' % nullids |
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615 ), |
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616 config=b'remotefilelog-ext', |
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617 ) |
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618 if missingids: |
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619 global fetches, fetched, fetchcost |
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620 fetches += 1 |
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621 |
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622 # We want to be able to detect excess individual file downloads, so |
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623 # let's log that information for debugging. |
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624 if fetches >= 15 and fetches < 18: |
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625 if fetches == 15: |
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626 fetchwarning = self.ui.config( |
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627 b'remotefilelog', b'fetchwarning' |
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628 ) |
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629 if fetchwarning: |
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630 self.ui.warn(fetchwarning + b'\n') |
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631 self.logstacktrace() |
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632 missingids = [(file, hex(id)) for file, id in sorted(missingids)] |
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633 fetched += len(missingids) |
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634 start = time.time() |
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635 missingids = self.request(missingids) |
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636 if missingids: |
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637 raise error.Abort( |
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638 _(b"unable to download %d files") % len(missingids) |
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639 ) |
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640 fetchcost += time.time() - start |
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641 self._lfsprefetch(fileids) |
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642 |
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643 def _lfsprefetch(self, fileids): |
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644 if not _lfsmod or not hasattr(self.repo.svfs, 'lfslocalblobstore'): |
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645 return |
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646 if not _lfsmod.wrapper.candownload(self.repo): |
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647 return |
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648 pointers = [] |
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649 store = self.repo.svfs.lfslocalblobstore |
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650 for file, id in fileids: |
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651 node = bin(id) |
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652 rlog = self.repo.file(file) |
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653 if rlog.flags(node) & revlog.REVIDX_EXTSTORED: |
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654 text = rlog.rawdata(node) |
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655 p = _lfsmod.pointer.deserialize(text) |
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656 oid = p.oid() |
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657 if not store.has(oid): |
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658 pointers.append(p) |
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659 if len(pointers) > 0: |
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660 self.repo.svfs.lfsremoteblobstore.readbatch(pointers, store) |
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661 assert all(store.has(p.oid()) for p in pointers) |
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662 |
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663 def logstacktrace(self): |
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664 import traceback |
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665 |
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666 self.ui.log( |
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667 b'remotefilelog', |
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668 b'excess remotefilelog fetching:\n%s\n', |
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faf00e30b63f
remotefilelog: actually fix (and test this time) a bytes vs str issue
Kyle Lippincott <spectral@google.com>
parents:
43835
diff
changeset
|
669 b''.join(pycompat.sysbytes(s) for s in traceback.format_stack()), |
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
42771
diff
changeset
|
670 ) |