Mercurial > hg
annotate hgext/remotefilelog/fileserverclient.py @ 43727:5b90a050082b
scmutil: add assertions to help pytype
Differential Revision: https://phab.mercurial-scm.org/D7456
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Tue, 19 Nov 2019 14:13:04 -0500 |
parents | 8ff1ecfadcd1 |
children | 94670e124d29 |
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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 |
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47 def getcachekey(reponame, file, id): |
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48 pathhash = node.hex(hashlib.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 = node.hex(hashlib.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 f = wireprotov1peer.future() |
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66 yield {b'file': file, b'node': node}, f |
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67 code, data = f.value.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 yield data |
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71 |
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72 @wireprotov1peer.batchable |
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73 def x_rfl_getflogheads(self, path): |
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74 if not self.capable(b'x_rfl_getflogheads'): |
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75 raise error.Abort( |
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76 b'configured remotefile server does not ' |
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77 b'support getflogheads' |
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78 ) |
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79 f = wireprotov1peer.future() |
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80 yield {b'path': path}, f |
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81 heads = f.value.split(b'\n') if f.value else [] |
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82 yield heads |
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83 |
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84 def _updatecallstreamopts(self, command, opts): |
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85 if command != b'getbundle': |
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86 return |
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87 if ( |
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88 constants.NETWORK_CAP_LEGACY_SSH_GETFILES |
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89 not in self.capabilities() |
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90 ): |
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91 return |
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92 if not util.safehasattr(self, '_localrepo'): |
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93 return |
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94 if ( |
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95 constants.SHALLOWREPO_REQUIREMENT |
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96 not in self._localrepo.requirements |
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97 ): |
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98 return |
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99 |
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100 bundlecaps = opts.get(b'bundlecaps') |
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101 if bundlecaps: |
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102 bundlecaps = [bundlecaps] |
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103 else: |
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104 bundlecaps = [] |
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105 |
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106 # shallow, includepattern, and excludepattern are a hacky way of |
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107 # carrying over data from the local repo to this getbundle |
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108 # command. We need to do it this way because bundle1 getbundle |
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109 # doesn't provide any other place we can hook in to manipulate |
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110 # getbundle args before it goes across the wire. Once we get rid |
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111 # of bundle1, we can use bundle2's _pullbundle2extraprepare to |
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112 # do this more cleanly. |
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113 bundlecaps.append(constants.BUNDLE2_CAPABLITY) |
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114 if self._localrepo.includepattern: |
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115 patterns = b'\0'.join(self._localrepo.includepattern) |
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116 includecap = b"includepattern=" + patterns |
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117 bundlecaps.append(includecap) |
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118 if self._localrepo.excludepattern: |
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119 patterns = b'\0'.join(self._localrepo.excludepattern) |
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120 excludecap = b"excludepattern=" + patterns |
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121 bundlecaps.append(excludecap) |
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122 opts[b'bundlecaps'] = b','.join(bundlecaps) |
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123 |
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124 def _sendrequest(self, command, args, **opts): |
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125 self._updatecallstreamopts(command, args) |
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126 return super(remotefilepeer, self)._sendrequest( |
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127 command, args, **opts |
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128 ) |
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129 |
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130 def _callstream(self, command, **opts): |
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131 supertype = super(remotefilepeer, self) |
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132 if not util.safehasattr(supertype, '_sendrequest'): |
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133 self._updatecallstreamopts(command, pycompat.byteskwargs(opts)) |
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134 return super(remotefilepeer, self)._callstream(command, **opts) |
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135 |
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136 peer.__class__ = remotefilepeer |
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137 |
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138 |
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139 class cacheconnection(object): |
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140 """The connection for communicating with the remote cache. Performs |
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141 gets and sets by communicating with an external process that has the |
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142 cache-specific implementation. |
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143 """ |
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144 |
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145 def __init__(self): |
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146 self.pipeo = self.pipei = self.pipee = None |
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147 self.subprocess = None |
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148 self.connected = False |
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149 |
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150 def connect(self, cachecommand): |
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151 if self.pipeo: |
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152 raise error.Abort(_(b"cache connection already open")) |
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153 self.pipei, self.pipeo, self.pipee, self.subprocess = procutil.popen4( |
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154 cachecommand |
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155 ) |
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156 self.connected = True |
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157 |
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158 def close(self): |
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159 def tryclose(pipe): |
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160 try: |
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161 pipe.close() |
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162 except Exception: |
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163 pass |
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164 |
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165 if self.connected: |
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166 try: |
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167 self.pipei.write(b"exit\n") |
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168 except Exception: |
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169 pass |
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170 tryclose(self.pipei) |
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171 self.pipei = None |
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172 tryclose(self.pipeo) |
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173 self.pipeo = None |
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174 tryclose(self.pipee) |
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175 self.pipee = None |
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176 try: |
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177 # Wait for process to terminate, making sure to avoid deadlock. |
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178 # See https://docs.python.org/2/library/subprocess.html for |
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179 # warnings about wait() and deadlocking. |
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180 self.subprocess.communicate() |
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181 except Exception: |
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182 pass |
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183 self.subprocess = None |
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184 self.connected = False |
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185 |
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186 def request(self, request, flush=True): |
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187 if self.connected: |
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188 try: |
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189 self.pipei.write(request) |
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190 if flush: |
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191 self.pipei.flush() |
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192 except IOError: |
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193 self.close() |
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194 |
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195 def receiveline(self): |
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196 if not self.connected: |
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197 return None |
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198 try: |
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199 result = self.pipeo.readline()[:-1] |
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200 if not result: |
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201 self.close() |
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202 except IOError: |
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203 self.close() |
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204 |
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205 return result |
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206 |
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207 |
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208 def _getfilesbatch( |
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209 remote, receivemissing, progresstick, missed, idmap, batchsize |
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210 ): |
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211 # Over http(s), iterbatch is a streamy method and we can start |
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212 # looking at results early. This means we send one (potentially |
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213 # large) request, but then we show nice progress as we process |
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214 # file results, rather than showing chunks of $batchsize in |
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215 # progress. |
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216 # |
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217 # Over ssh, iterbatch isn't streamy because batch() wasn't |
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218 # explicitly designed as a streaming method. In the future we |
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219 # should probably introduce a streambatch() method upstream and |
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220 # use that for this. |
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221 with remote.commandexecutor() as e: |
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222 futures = [] |
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223 for m in missed: |
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224 futures.append( |
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225 e.callcommand( |
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226 b'x_rfl_getfile', {b'file': idmap[m], b'node': m[-40:]} |
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227 ) |
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228 ) |
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229 |
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230 for i, m in enumerate(missed): |
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231 r = futures[i].result() |
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232 futures[i] = None # release memory |
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233 file_ = idmap[m] |
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234 node = m[-40:] |
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235 receivemissing(io.BytesIO(b'%d\n%s' % (len(r), r)), file_, node) |
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236 progresstick() |
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237 |
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238 |
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239 def _getfiles_optimistic( |
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240 remote, receivemissing, progresstick, missed, idmap, step |
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241 ): |
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242 remote._callstream(b"x_rfl_getfiles") |
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243 i = 0 |
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244 pipeo = remote._pipeo |
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245 pipei = remote._pipei |
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246 while i < len(missed): |
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247 # issue a batch of requests |
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248 start = i |
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249 end = min(len(missed), start + step) |
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250 i = end |
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251 for missingid in missed[start:end]: |
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252 # issue new request |
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253 versionid = missingid[-40:] |
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254 file = idmap[missingid] |
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255 sshrequest = b"%s%s\n" % (versionid, file) |
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256 pipeo.write(sshrequest) |
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257 pipeo.flush() |
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258 |
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259 # receive batch results |
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260 for missingid in missed[start:end]: |
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261 versionid = missingid[-40:] |
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262 file = idmap[missingid] |
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263 receivemissing(pipei, file, versionid) |
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264 progresstick() |
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265 |
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266 # End the command |
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267 pipeo.write(b'\n') |
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268 pipeo.flush() |
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269 |
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270 |
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271 def _getfiles_threaded( |
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272 remote, receivemissing, progresstick, missed, idmap, step |
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273 ): |
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274 remote._callstream(b"getfiles") |
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275 pipeo = remote._pipeo |
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276 pipei = remote._pipei |
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277 |
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278 def writer(): |
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279 for missingid in missed: |
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280 versionid = missingid[-40:] |
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281 file = idmap[missingid] |
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282 sshrequest = b"%s%s\n" % (versionid, file) |
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283 pipeo.write(sshrequest) |
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284 pipeo.flush() |
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285 |
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286 writerthread = threading.Thread(target=writer) |
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287 writerthread.daemon = True |
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288 writerthread.start() |
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289 |
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290 for missingid in missed: |
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291 versionid = missingid[-40:] |
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292 file = idmap[missingid] |
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293 receivemissing(pipei, file, versionid) |
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294 progresstick() |
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295 |
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296 writerthread.join() |
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297 # End the command |
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298 pipeo.write(b'\n') |
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299 pipeo.flush() |
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300 |
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301 |
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302 class fileserverclient(object): |
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303 """A client for requesting files from the remote file server. |
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304 """ |
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305 |
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306 def __init__(self, repo): |
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307 ui = repo.ui |
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308 self.repo = repo |
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309 self.ui = ui |
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310 self.cacheprocess = ui.config(b"remotefilelog", b"cacheprocess") |
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311 if self.cacheprocess: |
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312 self.cacheprocess = util.expandpath(self.cacheprocess) |
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313 |
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314 # This option causes remotefilelog to pass the full file path to the |
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315 # cacheprocess instead of a hashed key. |
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316 self.cacheprocesspasspath = ui.configbool( |
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317 b"remotefilelog", b"cacheprocess.includepath" |
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318 ) |
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319 |
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320 self.debugoutput = ui.configbool(b"remotefilelog", b"debug") |
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321 |
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322 self.remotecache = cacheconnection() |
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323 |
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324 def setstore(self, datastore, historystore, writedata, writehistory): |
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325 self.datastore = datastore |
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326 self.historystore = historystore |
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327 self.writedata = writedata |
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328 self.writehistory = writehistory |
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329 |
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330 def _connect(self): |
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331 return self.repo.connectionpool.get(self.repo.fallbackpath) |
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332 |
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333 def request(self, fileids): |
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334 """Takes a list of filename/node pairs and fetches them from the |
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335 server. Files are stored in the local cache. |
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336 A list of nodes that the server couldn't find is returned. |
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337 If the connection fails, an exception is raised. |
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338 """ |
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339 if not self.remotecache.connected: |
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340 self.connect() |
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341 cache = self.remotecache |
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342 writedata = self.writedata |
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343 |
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344 repo = self.repo |
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345 total = len(fileids) |
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346 request = b"get\n%d\n" % total |
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347 idmap = {} |
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348 reponame = repo.name |
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349 for file, id in fileids: |
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350 fullid = getcachekey(reponame, file, id) |
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351 if self.cacheprocesspasspath: |
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352 request += file + b'\0' |
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353 request += fullid + b"\n" |
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354 idmap[fullid] = file |
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355 |
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356 cache.request(request) |
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357 |
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358 progress = self.ui.makeprogress(_(b'downloading'), total=total) |
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359 progress.update(0) |
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360 |
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361 missed = [] |
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362 while True: |
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363 missingid = cache.receiveline() |
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364 if not missingid: |
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365 missedset = set(missed) |
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366 for missingid in idmap: |
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367 if not missingid in missedset: |
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368 missed.append(missingid) |
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369 self.ui.warn( |
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370 _( |
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371 b"warning: cache connection closed early - " |
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372 + b"falling back to server\n" |
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373 ) |
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374 ) |
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375 break |
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376 if missingid == b"0": |
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377 break |
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378 if missingid.startswith(b"_hits_"): |
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379 # receive progress reports |
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380 parts = missingid.split(b"_") |
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381 progress.increment(int(parts[2])) |
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382 continue |
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383 |
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384 missed.append(missingid) |
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385 |
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386 global fetchmisses |
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387 fetchmisses += len(missed) |
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388 |
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389 fromcache = total - len(missed) |
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390 progress.update(fromcache, total=total) |
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391 self.ui.log( |
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392 b"remotefilelog", |
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393 b"remote cache hit rate is %r of %r\n", |
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394 fromcache, |
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395 total, |
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396 hit=fromcache, |
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397 total=total, |
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398 ) |
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399 |
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400 oldumask = os.umask(0o002) |
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401 try: |
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402 # receive cache misses from master |
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403 if missed: |
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404 # When verbose is true, sshpeer prints 'running ssh...' |
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405 # to stdout, which can interfere with some command |
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406 # outputs |
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407 verbose = self.ui.verbose |
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408 self.ui.verbose = False |
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409 try: |
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410 with self._connect() as conn: |
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411 remote = conn.peer |
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412 if remote.capable( |
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413 constants.NETWORK_CAP_LEGACY_SSH_GETFILES |
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414 ): |
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415 if not isinstance(remote, _sshv1peer): |
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416 raise error.Abort( |
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417 b'remotefilelog requires ssh servers' |
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418 ) |
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419 step = self.ui.configint( |
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420 b'remotefilelog', b'getfilesstep' |
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421 ) |
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422 getfilestype = self.ui.config( |
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423 b'remotefilelog', b'getfilestype' |
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424 ) |
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425 if getfilestype == b'threaded': |
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426 _getfiles = _getfiles_threaded |
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427 else: |
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428 _getfiles = _getfiles_optimistic |
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429 _getfiles( |
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430 remote, |
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431 self.receivemissing, |
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432 progress.increment, |
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433 missed, |
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434 idmap, |
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435 step, |
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436 ) |
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437 elif remote.capable(b"x_rfl_getfile"): |
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438 if remote.capable(b'batch'): |
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439 batchdefault = 100 |
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440 else: |
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441 batchdefault = 10 |
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442 batchsize = self.ui.configint( |
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443 b'remotefilelog', b'batchsize', batchdefault |
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444 ) |
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445 self.ui.debug( |
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446 b'requesting %d files from ' |
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447 b'remotefilelog server...\n' % len(missed) |
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448 ) |
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449 _getfilesbatch( |
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450 remote, |
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451 self.receivemissing, |
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452 progress.increment, |
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453 missed, |
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454 idmap, |
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455 batchsize, |
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456 ) |
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457 else: |
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458 raise error.Abort( |
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459 b"configured remotefilelog server" |
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460 b" does not support remotefilelog" |
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461 ) |
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462 |
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463 self.ui.log( |
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464 b"remotefilefetchlog", |
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465 b"Success\n", |
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466 fetched_files=progress.pos - fromcache, |
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467 total_to_fetch=total - fromcache, |
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468 ) |
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469 except Exception: |
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470 self.ui.log( |
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471 b"remotefilefetchlog", |
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472 b"Fail\n", |
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473 fetched_files=progress.pos - fromcache, |
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474 total_to_fetch=total - fromcache, |
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475 ) |
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476 raise |
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477 finally: |
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478 self.ui.verbose = verbose |
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479 # send to memcache |
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480 request = b"set\n%d\n%s\n" % (len(missed), b"\n".join(missed)) |
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481 cache.request(request) |
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482 |
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483 progress.complete() |
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484 |
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485 # mark ourselves as a user of this cache |
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486 writedata.markrepo(self.repo.path) |
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487 finally: |
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488 os.umask(oldumask) |
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489 |
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490 def receivemissing(self, pipe, filename, node): |
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491 line = pipe.readline()[:-1] |
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492 if not line: |
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493 raise error.ResponseError( |
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494 _(b"error downloading file contents:"), |
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495 _(b"connection closed early"), |
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496 ) |
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497 size = int(line) |
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498 data = pipe.read(size) |
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499 if len(data) != size: |
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500 raise error.ResponseError( |
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501 _(b"error downloading file contents:"), |
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502 _(b"only received %s of %s bytes") % (len(data), size), |
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503 ) |
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504 |
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505 self.writedata.addremotefilelognode( |
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506 filename, bin(node), zlib.decompress(data) |
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507 ) |
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508 |
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509 def connect(self): |
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510 if self.cacheprocess: |
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511 cmd = b"%s %s" % (self.cacheprocess, self.writedata._path) |
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512 self.remotecache.connect(cmd) |
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513 else: |
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514 # If no cache process is specified, we fake one that always |
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515 # returns cache misses. This enables tests to run easily |
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516 # and may eventually allow us to be a drop in replacement |
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517 # for the largefiles extension. |
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518 class simplecache(object): |
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519 def __init__(self): |
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520 self.missingids = [] |
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521 self.connected = True |
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522 |
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523 def close(self): |
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524 pass |
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525 |
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526 def request(self, value, flush=True): |
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527 lines = value.split(b"\n") |
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528 if lines[0] != b"get": |
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529 return |
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530 self.missingids = lines[2:-1] |
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531 self.missingids.append(b'0') |
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532 |
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533 def receiveline(self): |
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534 if len(self.missingids) > 0: |
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535 return self.missingids.pop(0) |
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536 return None |
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537 |
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538 self.remotecache = simplecache() |
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539 |
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540 def close(self): |
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541 if fetches: |
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542 msg = ( |
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543 b"%d files fetched over %d fetches - " |
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544 + b"(%d misses, %0.2f%% hit ratio) over %0.2fs\n" |
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545 ) % ( |
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546 fetched, |
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547 fetches, |
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548 fetchmisses, |
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549 float(fetched - fetchmisses) / float(fetched) * 100.0, |
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550 fetchcost, |
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551 ) |
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552 if self.debugoutput: |
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553 self.ui.warn(msg) |
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554 self.ui.log( |
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555 b"remotefilelog.prefetch", |
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556 msg.replace(b"%", b"%%"), |
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557 remotefilelogfetched=fetched, |
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558 remotefilelogfetches=fetches, |
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559 remotefilelogfetchmisses=fetchmisses, |
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560 remotefilelogfetchtime=fetchcost * 1000, |
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561 ) |
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562 |
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563 if self.remotecache.connected: |
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564 self.remotecache.close() |
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565 |
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566 def prefetch( |
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567 self, fileids, force=False, fetchdata=True, fetchhistory=False |
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568 ): |
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569 """downloads the given file versions to the cache |
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570 """ |
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571 repo = self.repo |
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572 idstocheck = [] |
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573 for file, id in fileids: |
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574 # hack |
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575 # - we don't use .hgtags |
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576 # - workingctx produces ids with length 42, |
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577 # which we skip since they aren't in any cache |
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578 if ( |
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579 file == b'.hgtags' |
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580 or len(id) == 42 |
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581 or not repo.shallowmatch(file) |
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582 ): |
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583 continue |
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584 |
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585 idstocheck.append((file, bin(id))) |
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586 |
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587 datastore = self.datastore |
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588 historystore = self.historystore |
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589 if force: |
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590 datastore = contentstore.unioncontentstore(*repo.shareddatastores) |
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591 historystore = metadatastore.unionmetadatastore( |
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592 *repo.sharedhistorystores |
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593 ) |
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594 |
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595 missingids = set() |
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596 if fetchdata: |
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597 missingids.update(datastore.getmissing(idstocheck)) |
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598 if fetchhistory: |
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599 missingids.update(historystore.getmissing(idstocheck)) |
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600 |
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601 # partition missing nodes into nullid and not-nullid so we can |
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602 # warn about this filtering potentially shadowing bugs. |
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603 nullids = len([None for unused, id in missingids if id == nullid]) |
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604 if nullids: |
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605 missingids = [(f, id) for f, id in missingids if id != nullid] |
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606 repo.ui.develwarn( |
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607 ( |
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608 b'remotefilelog not fetching %d null revs' |
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609 b' - this is likely hiding bugs' % nullids |
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610 ), |
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611 config=b'remotefilelog-ext', |
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612 ) |
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613 if missingids: |
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614 global fetches, fetched, fetchcost |
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615 fetches += 1 |
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616 |
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617 # We want to be able to detect excess individual file downloads, so |
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618 # let's log that information for debugging. |
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619 if fetches >= 15 and fetches < 18: |
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620 if fetches == 15: |
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621 fetchwarning = self.ui.config( |
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622 b'remotefilelog', b'fetchwarning' |
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623 ) |
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624 if fetchwarning: |
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625 self.ui.warn(fetchwarning + b'\n') |
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626 self.logstacktrace() |
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627 missingids = [(file, hex(id)) for file, id in sorted(missingids)] |
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628 fetched += len(missingids) |
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629 start = time.time() |
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630 missingids = self.request(missingids) |
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631 if missingids: |
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632 raise error.Abort( |
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633 _(b"unable to download %d files") % len(missingids) |
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634 ) |
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635 fetchcost += time.time() - start |
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636 self._lfsprefetch(fileids) |
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637 |
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638 def _lfsprefetch(self, fileids): |
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639 if not _lfsmod or not util.safehasattr( |
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640 self.repo.svfs, b'lfslocalblobstore' |
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641 ): |
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642 return |
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643 if not _lfsmod.wrapper.candownload(self.repo): |
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644 return |
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645 pointers = [] |
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646 store = self.repo.svfs.lfslocalblobstore |
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647 for file, id in fileids: |
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648 node = bin(id) |
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649 rlog = self.repo.file(file) |
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650 if rlog.flags(node) & revlog.REVIDX_EXTSTORED: |
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651 text = rlog.rawdata(node) |
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652 p = _lfsmod.pointer.deserialize(text) |
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653 oid = p.oid() |
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654 if not store.has(oid): |
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655 pointers.append(p) |
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656 if len(pointers) > 0: |
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657 self.repo.svfs.lfsremoteblobstore.readbatch(pointers, store) |
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658 assert all(store.has(p.oid()) for p in pointers) |
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659 |
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660 def logstacktrace(self): |
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661 import traceback |
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662 |
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663 self.ui.log( |
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664 b'remotefilelog', |
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665 b'excess remotefilelog fetching:\n%s\n', |
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666 b''.join(traceback.format_stack()), |
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667 ) |