Mercurial > hg
annotate mercurial/exchangev2.py @ 40179:b843356d4ae1
exchangev2: use filesdata
filesdata is a more efficient mechanism for bulk fetching files data for a
range of changesets. Let's use it in exchangev2.
With this change, a client performing a full clone of mozilla-unified
transmits substantially fewer bytes across the wire:
before: 139,124,863 bytes sent
after: 20,522,499 bytes sent
The bulk of the remaining bytes is likely the transfer of ~1M nodes for
changesets and manifests. We can eliminate this by making requests in
terms of node ranges instead of explicit node lists...
Differential Revision: https://phab.mercurial-scm.org/D4982
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 03 Oct 2018 13:57:42 -0700 |
parents | 41263df08109 |
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1 # exchangev2.py - repository exchange for wire protocol version 2 |
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2 # |
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3 # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import collections |
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11 import weakref |
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12 |
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13 from .i18n import _ |
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14 from .node import ( |
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15 nullid, |
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16 short, |
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17 ) |
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18 from . import ( |
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19 bookmarks, |
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20 error, |
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21 mdiff, |
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22 phases, |
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23 pycompat, |
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24 setdiscovery, |
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25 ) |
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26 |
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27 def pull(pullop): |
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28 """Pull using wire protocol version 2.""" |
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29 repo = pullop.repo |
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30 remote = pullop.remote |
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31 tr = pullop.trmanager.transaction() |
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32 |
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33 # Figure out what needs to be fetched. |
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34 common, fetch, remoteheads = _pullchangesetdiscovery( |
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35 repo, remote, pullop.heads, abortwhenunrelated=pullop.force) |
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36 |
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37 # And fetch the data. |
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38 pullheads = pullop.heads or remoteheads |
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39 csetres = _fetchchangesets(repo, tr, remote, common, fetch, pullheads) |
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40 |
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41 # New revisions are written to the changelog. But all other updates |
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42 # are deferred. Do those now. |
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43 |
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44 # Ensure all new changesets are draft by default. If the repo is |
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45 # publishing, the phase will be adjusted by the loop below. |
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46 if csetres['added']: |
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47 phases.registernew(repo, tr, phases.draft, csetres['added']) |
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48 |
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49 # And adjust the phase of all changesets accordingly. |
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50 for phase in phases.phasenames: |
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51 if phase == b'secret' or not csetres['nodesbyphase'][phase]: |
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52 continue |
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53 |
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54 phases.advanceboundary(repo, tr, phases.phasenames.index(phase), |
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55 csetres['nodesbyphase'][phase]) |
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56 |
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57 # Write bookmark updates. |
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58 bookmarks.updatefromremote(repo.ui, repo, csetres['bookmarks'], |
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59 remote.url(), pullop.gettransaction, |
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60 explicit=pullop.explicitbookmarks) |
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61 |
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62 manres = _fetchmanifests(repo, tr, remote, csetres['manifestnodes']) |
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63 |
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64 # Find all file nodes referenced by added manifests and fetch those |
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65 # revisions. |
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66 fnodes = _derivefilesfrommanifests(repo, manres['added']) |
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67 _fetchfilesfromcsets(repo, tr, remote, fnodes, csetres['added'], |
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68 manres['linkrevs']) |
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69 |
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70 def _pullchangesetdiscovery(repo, remote, heads, abortwhenunrelated=True): |
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71 """Determine which changesets need to be pulled.""" |
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72 |
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73 if heads: |
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74 knownnode = repo.changelog.hasnode |
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75 if all(knownnode(head) for head in heads): |
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76 return heads, False, heads |
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77 |
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78 # TODO wire protocol version 2 is capable of more efficient discovery |
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79 # than setdiscovery. Consider implementing something better. |
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80 common, fetch, remoteheads = setdiscovery.findcommonheads( |
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81 repo.ui, repo, remote, abortwhenunrelated=abortwhenunrelated) |
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82 |
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83 common = set(common) |
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84 remoteheads = set(remoteheads) |
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85 |
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86 # If a remote head is filtered locally, put it back in the common set. |
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87 # See the comment in exchange._pulldiscoverychangegroup() for more. |
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88 |
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89 if fetch and remoteheads: |
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90 nodemap = repo.unfiltered().changelog.nodemap |
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91 |
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92 common |= {head for head in remoteheads if head in nodemap} |
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93 |
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94 if set(remoteheads).issubset(common): |
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95 fetch = [] |
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96 |
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97 common.discard(nullid) |
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98 |
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99 return common, fetch, remoteheads |
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100 |
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101 def _fetchchangesets(repo, tr, remote, common, fetch, remoteheads): |
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102 # TODO consider adding a step here where we obtain the DAG shape first |
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103 # (or ask the server to slice changesets into chunks for us) so that |
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104 # we can perform multiple fetches in batches. This will facilitate |
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105 # resuming interrupted clones, higher server-side cache hit rates due |
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106 # to smaller segments, etc. |
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107 with remote.commandexecutor() as e: |
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108 objs = e.callcommand(b'changesetdata', { |
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109 b'revisions': [{ |
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110 b'type': b'changesetdagrange', |
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111 b'roots': sorted(common), |
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112 b'heads': sorted(remoteheads), |
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113 }], |
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114 b'fields': {b'bookmarks', b'parents', b'phase', b'revision'}, |
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115 }).result() |
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116 |
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117 # The context manager waits on all response data when exiting. So |
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118 # we need to remain in the context manager in order to stream data. |
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119 return _processchangesetdata(repo, tr, objs) |
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120 |
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121 def _processchangesetdata(repo, tr, objs): |
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122 repo.hook('prechangegroup', throw=True, |
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123 **pycompat.strkwargs(tr.hookargs)) |
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124 |
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125 urepo = repo.unfiltered() |
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126 cl = urepo.changelog |
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127 |
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128 cl.delayupdate(tr) |
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129 |
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130 # The first emitted object is a header describing the data that |
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131 # follows. |
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132 meta = next(objs) |
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133 |
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134 progress = repo.ui.makeprogress(_('changesets'), |
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135 unit=_('chunks'), |
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136 total=meta.get(b'totalitems')) |
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137 |
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138 manifestnodes = {} |
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139 |
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140 def linkrev(node): |
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141 repo.ui.debug('add changeset %s\n' % short(node)) |
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142 # Linkrev for changelog is always self. |
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143 return len(cl) |
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144 |
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145 def onchangeset(cl, node): |
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146 progress.increment() |
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147 |
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148 revision = cl.changelogrevision(node) |
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149 |
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150 # We need to preserve the mapping of changelog revision to node |
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151 # so we can set the linkrev accordingly when manifests are added. |
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152 manifestnodes[cl.rev(node)] = revision.manifest |
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153 |
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154 nodesbyphase = {phase: set() for phase in phases.phasenames} |
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155 remotebookmarks = {} |
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156 |
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157 # addgroup() expects a 7-tuple describing revisions. This normalizes |
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158 # the wire data to that format. |
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159 # |
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160 # This loop also aggregates non-revision metadata, such as phase |
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161 # data. |
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162 def iterrevisions(): |
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163 for cset in objs: |
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164 node = cset[b'node'] |
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165 |
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166 if b'phase' in cset: |
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167 nodesbyphase[cset[b'phase']].add(node) |
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168 |
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169 for mark in cset.get(b'bookmarks', []): |
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170 remotebookmarks[mark] = node |
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171 |
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172 # TODO add mechanism for extensions to examine records so they |
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173 # can siphon off custom data fields. |
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174 |
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175 extrafields = {} |
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176 |
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177 for field, size in cset.get(b'fieldsfollowing', []): |
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178 extrafields[field] = next(objs) |
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179 |
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180 # Some entries might only be metadata only updates. |
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181 if b'revision' not in extrafields: |
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182 continue |
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183 |
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184 data = extrafields[b'revision'] |
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185 |
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186 yield ( |
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187 node, |
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188 cset[b'parents'][0], |
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189 cset[b'parents'][1], |
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190 # Linknode is always itself for changesets. |
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191 cset[b'node'], |
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192 # We always send full revisions. So delta base is not set. |
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193 nullid, |
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194 mdiff.trivialdiffheader(len(data)) + data, |
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195 # Flags not yet supported. |
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196 0, |
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197 ) |
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198 |
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199 added = cl.addgroup(iterrevisions(), linkrev, weakref.proxy(tr), |
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200 addrevisioncb=onchangeset) |
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201 |
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202 progress.complete() |
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203 |
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204 return { |
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205 'added': added, |
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206 'nodesbyphase': nodesbyphase, |
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207 'bookmarks': remotebookmarks, |
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208 'manifestnodes': manifestnodes, |
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209 } |
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210 |
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211 def _fetchmanifests(repo, tr, remote, manifestnodes): |
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212 rootmanifest = repo.manifestlog.getstorage(b'') |
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213 |
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214 # Some manifests can be shared between changesets. Filter out revisions |
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215 # we already know about. |
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216 fetchnodes = [] |
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217 linkrevs = {} |
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218 seen = set() |
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219 |
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220 for clrev, node in sorted(manifestnodes.iteritems()): |
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221 if node in seen: |
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222 continue |
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223 |
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224 try: |
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225 rootmanifest.rev(node) |
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226 except error.LookupError: |
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227 fetchnodes.append(node) |
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228 linkrevs[node] = clrev |
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229 |
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230 seen.add(node) |
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231 |
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232 # TODO handle tree manifests |
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233 |
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234 # addgroup() expects 7-tuple describing revisions. This normalizes |
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235 # the wire data to that format. |
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236 def iterrevisions(objs, progress): |
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237 for manifest in objs: |
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238 node = manifest[b'node'] |
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239 |
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240 extrafields = {} |
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241 |
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242 for field, size in manifest.get(b'fieldsfollowing', []): |
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243 extrafields[field] = next(objs) |
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244 |
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245 if b'delta' in extrafields: |
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246 basenode = manifest[b'deltabasenode'] |
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247 delta = extrafields[b'delta'] |
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248 elif b'revision' in extrafields: |
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249 basenode = nullid |
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250 revision = extrafields[b'revision'] |
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251 delta = mdiff.trivialdiffheader(len(revision)) + revision |
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252 else: |
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253 continue |
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254 |
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255 yield ( |
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256 node, |
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257 manifest[b'parents'][0], |
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258 manifest[b'parents'][1], |
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259 # The value passed in is passed to the lookup function passed |
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260 # to addgroup(). We already have a map of manifest node to |
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261 # changelog revision number. So we just pass in the |
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262 # manifest node here and use linkrevs.__getitem__ as the |
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263 # resolution function. |
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264 node, |
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265 basenode, |
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266 delta, |
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267 # Flags not yet supported. |
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268 0 |
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269 ) |
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270 |
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271 progress.increment() |
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272 |
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273 progress = repo.ui.makeprogress(_('manifests'), unit=_('chunks'), |
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274 total=len(fetchnodes)) |
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275 |
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276 commandmeta = remote.apidescriptor[b'commands'][b'manifestdata'] |
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277 batchsize = commandmeta.get(b'recommendedbatchsize', 10000) |
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278 # TODO make size configurable on client? |
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279 |
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280 # We send commands 1 at a time to the remote. This is not the most |
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281 # efficient because we incur a round trip at the end of each batch. |
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282 # However, the existing frame-based reactor keeps consuming server |
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283 # data in the background. And this results in response data buffering |
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284 # in memory. This can consume gigabytes of memory. |
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285 # TODO send multiple commands in a request once background buffering |
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286 # issues are resolved. |
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287 |
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288 added = [] |
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289 |
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290 for i in pycompat.xrange(0, len(fetchnodes), batchsize): |
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291 batch = [node for node in fetchnodes[i:i + batchsize]] |
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292 if not batch: |
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293 continue |
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294 |
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295 with remote.commandexecutor() as e: |
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296 objs = e.callcommand(b'manifestdata', { |
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297 b'tree': b'', |
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298 b'nodes': batch, |
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299 b'fields': {b'parents', b'revision'}, |
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300 b'haveparents': True, |
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301 }).result() |
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302 |
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303 # Chomp off header object. |
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304 next(objs) |
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305 |
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306 added.extend(rootmanifest.addgroup( |
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307 iterrevisions(objs, progress), |
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308 linkrevs.__getitem__, |
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309 weakref.proxy(tr))) |
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310 |
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311 progress.complete() |
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312 |
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313 return { |
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314 'added': added, |
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315 'linkrevs': linkrevs, |
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316 } |
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317 |
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318 def _derivefilesfrommanifests(repo, manifestnodes): |
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319 """Determine what file nodes are relevant given a set of manifest nodes. |
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320 |
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321 Returns a dict mapping file paths to dicts of file node to first manifest |
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322 node. |
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323 """ |
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324 ml = repo.manifestlog |
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325 fnodes = collections.defaultdict(dict) |
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326 |
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327 progress = repo.ui.makeprogress( |
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328 _('scanning manifests'), total=len(manifestnodes)) |
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329 |
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330 with progress: |
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331 for manifestnode in manifestnodes: |
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332 m = ml.get(b'', manifestnode) |
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333 |
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334 # TODO this will pull in unwanted nodes because it takes the storage |
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335 # delta into consideration. What we really want is something that |
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336 # takes the delta between the manifest's parents. And ideally we |
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337 # would ignore file nodes that are known locally. For now, ignore |
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338 # both these limitations. This will result in incremental fetches |
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339 # requesting data we already have. So this is far from ideal. |
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340 md = m.readfast() |
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341 |
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342 for path, fnode in md.items(): |
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343 fnodes[path].setdefault(fnode, manifestnode) |
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344 |
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345 progress.increment() |
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346 |
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347 return fnodes |
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348 |
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349 def _fetchfiles(repo, tr, remote, fnodes, linkrevs): |
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350 """Fetch file data from explicit file revisions.""" |
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351 def iterrevisions(objs, progress): |
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352 for filerevision in objs: |
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353 node = filerevision[b'node'] |
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354 |
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355 extrafields = {} |
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356 |
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357 for field, size in filerevision.get(b'fieldsfollowing', []): |
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358 extrafields[field] = next(objs) |
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359 |
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360 if b'delta' in extrafields: |
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361 basenode = filerevision[b'deltabasenode'] |
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362 delta = extrafields[b'delta'] |
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363 elif b'revision' in extrafields: |
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364 basenode = nullid |
39814
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365 revision = extrafields[b'revision'] |
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366 delta = mdiff.trivialdiffheader(len(revision)) + revision |
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|
367 else: |
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|
368 continue |
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|
369 |
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370 yield ( |
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|
371 node, |
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372 filerevision[b'parents'][0], |
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373 filerevision[b'parents'][1], |
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|
374 node, |
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|
375 basenode, |
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|
376 delta, |
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|
377 # Flags not yet supported. |
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378 0, |
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|
379 ) |
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|
380 |
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381 progress.increment() |
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382 |
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383 progress = repo.ui.makeprogress( |
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384 _('files'), unit=_('chunks'), |
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385 total=sum(len(v) for v in fnodes.itervalues())) |
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386 |
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387 # TODO make batch size configurable |
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388 batchsize = 10000 |
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389 fnodeslist = [x for x in sorted(fnodes.items())] |
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390 |
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391 for i in pycompat.xrange(0, len(fnodeslist), batchsize): |
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392 batch = [x for x in fnodeslist[i:i + batchsize]] |
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393 if not batch: |
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394 continue |
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395 |
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|
396 with remote.commandexecutor() as e: |
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397 fs = [] |
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398 locallinkrevs = {} |
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|
399 |
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400 for path, nodes in batch: |
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401 fs.append((path, e.callcommand(b'filedata', { |
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402 b'path': path, |
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|
403 b'nodes': sorted(nodes), |
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404 b'fields': {b'parents', b'revision'}, |
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405 b'haveparents': True, |
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406 }))) |
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|
407 |
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|
408 locallinkrevs[path] = { |
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409 node: linkrevs[manifestnode] |
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410 for node, manifestnode in nodes.iteritems()} |
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|
411 |
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412 for path, f in fs: |
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413 objs = f.result() |
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414 |
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415 # Chomp off header objects. |
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416 next(objs) |
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417 |
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418 store = repo.file(path) |
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419 store.addgroup( |
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420 iterrevisions(objs, progress), |
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421 locallinkrevs[path].__getitem__, |
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|
422 weakref.proxy(tr)) |
40179
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423 |
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424 def _fetchfilesfromcsets(repo, tr, remote, fnodes, csets, manlinkrevs): |
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425 """Fetch file data from explicit changeset revisions.""" |
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426 |
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427 def iterrevisions(objs, remaining, progress): |
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428 while remaining: |
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|
429 filerevision = next(objs) |
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|
430 |
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|
431 node = filerevision[b'node'] |
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|
432 |
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433 extrafields = {} |
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|
434 |
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|
435 for field, size in filerevision.get(b'fieldsfollowing', []): |
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|
436 extrafields[field] = next(objs) |
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|
437 |
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|
438 if b'delta' in extrafields: |
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|
439 basenode = filerevision[b'deltabasenode'] |
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|
440 delta = extrafields[b'delta'] |
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|
441 elif b'revision' in extrafields: |
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|
442 basenode = nullid |
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|
443 revision = extrafields[b'revision'] |
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|
444 delta = mdiff.trivialdiffheader(len(revision)) + revision |
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|
445 else: |
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|
446 continue |
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|
447 |
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|
448 yield ( |
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|
449 node, |
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|
450 filerevision[b'parents'][0], |
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|
451 filerevision[b'parents'][1], |
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|
452 node, |
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|
453 basenode, |
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|
454 delta, |
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|
455 # Flags not yet supported. |
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|
456 0, |
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|
457 ) |
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|
458 |
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|
459 progress.increment() |
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|
460 remaining -= 1 |
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|
461 |
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|
462 progress = repo.ui.makeprogress( |
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|
463 _('files'), unit=_('chunks'), |
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|
464 total=sum(len(v) for v in fnodes.itervalues())) |
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|
465 |
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|
466 commandmeta = remote.apidescriptor[b'commands'][b'filesdata'] |
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|
467 batchsize = commandmeta.get(b'recommendedbatchsize', 50000) |
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|
468 |
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|
469 for i in pycompat.xrange(0, len(csets), batchsize): |
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|
470 batch = [x for x in csets[i:i + batchsize]] |
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|
471 if not batch: |
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|
472 continue |
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|
473 |
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|
474 with remote.commandexecutor() as e: |
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|
475 args = { |
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diff
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|
476 b'revisions': [{ |
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diff
changeset
|
477 b'type': b'changesetexplicit', |
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diff
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|
478 b'nodes': batch, |
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changeset
|
479 }], |
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changeset
|
480 b'fields': {b'parents', b'revision'}, |
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|
481 b'haveparents': True, |
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|
482 } |
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|
483 |
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|
484 objs = e.callcommand(b'filesdata', args).result() |
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diff
changeset
|
485 |
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|
486 # First object is an overall header. |
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|
487 overall = next(objs) |
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diff
changeset
|
488 |
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diff
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489 # We have overall['totalpaths'] segments. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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490 for i in pycompat.xrange(overall[b'totalpaths']): |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
40176
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491 header = next(objs) |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
40176
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492 |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
40176
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493 path = header[b'path'] |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
40176
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494 store = repo.file(path) |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
40176
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495 |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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496 linkrevs = { |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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497 fnode: manlinkrevs[mnode] |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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498 for fnode, mnode in fnodes[path].iteritems()} |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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499 |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
40176
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500 store.addgroup(iterrevisions(objs, header[b'totalitems'], |
b843356d4ae1
exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
40176
diff
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501 progress), |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
40176
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502 linkrevs.__getitem__, |
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exchangev2: use filesdata
Gregory Szorc <gregory.szorc@gmail.com>
parents:
40176
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503 weakref.proxy(tr)) |