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annotate mercurial/repoview.py @ 43496:c470e699cd00

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repoview: move changelog.__contains__() override to filteredchangelog Differential Revision: https://phab.mercurial-scm.org/D7238
author Martin von Zweigbergk <martinvonz@google.com>
date Tue, 05 Nov 2019 14:11:30 -0800
parents 7bc8e49a7c35
children c093fb81404f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # repoview.py - Filtered view of a localrepo object
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2 #
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3 # Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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4 # Logilab SA <contact@logilab.fr>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8
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9 from __future__ import absolute_import
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10
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11 import copy
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12 import weakref
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13
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14 from .node import nullrev
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15 from .pycompat import (
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16 delattr,
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17 getattr,
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18 setattr,
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19 )
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20 from . import (
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21 obsolete,
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22 phases,
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23 pycompat,
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24 tags as tagsmod,
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25 util,
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26 )
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27 from .utils import repoviewutil
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28
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30 def hideablerevs(repo):
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31 """Revision candidates to be hidden
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32
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33 This is a standalone function to allow extensions to wrap it.
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34
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35 Because we use the set of immutable changesets as a fallback subset in
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36 branchmap (see mercurial.utils.repoviewutils.subsettable), you cannot set
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37 "public" changesets as "hideable". Doing so would break multiple code
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38 assertions and lead to crashes."""
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39 obsoletes = obsolete.getrevs(repo, b'obsolete')
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40 internals = repo._phasecache.getrevset(repo, phases.localhiddenphases)
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41 internals = frozenset(internals)
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42 return obsoletes | internals
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44
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45 def pinnedrevs(repo):
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46 """revisions blocking hidden changesets from being filtered
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47 """
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48
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49 cl = repo.changelog
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50 pinned = set()
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51 pinned.update([par.rev() for par in repo[None].parents()])
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52 pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()])
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53
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54 tags = {}
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55 tagsmod.readlocaltags(repo.ui, repo, tags, {})
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56 if tags:
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57 rev, nodemap = cl.rev, cl.nodemap
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58 pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap)
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59 return pinned
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61
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62 def _revealancestors(pfunc, hidden, revs):
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63 """reveals contiguous chains of hidden ancestors of 'revs' by removing them
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64 from 'hidden'
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65
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66 - pfunc(r): a funtion returning parent of 'r',
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67 - hidden: the (preliminary) hidden revisions, to be updated
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68 - revs: iterable of revnum,
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69
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70 (Ancestors are revealed exclusively, i.e. the elements in 'revs' are
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71 *not* revealed)
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72 """
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73 stack = list(revs)
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74 while stack:
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75 for p in pfunc(stack.pop()):
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76 if p != nullrev and p in hidden:
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77 hidden.remove(p)
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78 stack.append(p)
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79
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80
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81 def computehidden(repo, visibilityexceptions=None):
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82 """compute the set of hidden revision to filter
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83
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84 During most operation hidden should be filtered."""
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85 assert not repo.changelog.filteredrevs
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86
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87 hidden = hideablerevs(repo)
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88 if hidden:
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89 hidden = set(hidden - pinnedrevs(repo))
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90 if visibilityexceptions:
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91 hidden -= visibilityexceptions
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92 pfunc = repo.changelog.parentrevs
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93 mutable = repo._phasecache.getrevset(repo, phases.mutablephases)
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94
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95 visible = mutable - hidden
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96 _revealancestors(pfunc, hidden, visible)
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97 return frozenset(hidden)
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98
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99
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100 def computesecret(repo, visibilityexceptions=None):
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101 """compute the set of revision that can never be exposed through hgweb
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102
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103 Changeset in the secret phase (or above) should stay unaccessible."""
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104 assert not repo.changelog.filteredrevs
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105 secrets = repo._phasecache.getrevset(repo, phases.remotehiddenphases)
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106 return frozenset(secrets)
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107
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108
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109 def computeunserved(repo, visibilityexceptions=None):
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110 """compute the set of revision that should be filtered when used a server
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111
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112 Secret and hidden changeset should not pretend to be here."""
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113 assert not repo.changelog.filteredrevs
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114 # fast path in simple case to avoid impact of non optimised code
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115 hiddens = filterrevs(repo, b'visible')
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116 secrets = filterrevs(repo, b'served.hidden')
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117 if secrets:
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118 return frozenset(hiddens | secrets)
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119 else:
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120 return hiddens
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121
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122
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123 def computemutable(repo, visibilityexceptions=None):
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124 assert not repo.changelog.filteredrevs
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125 # fast check to avoid revset call on huge repo
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126 if any(repo._phasecache.phaseroots[1:]):
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127 getphase = repo._phasecache.phase
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128 maymutable = filterrevs(repo, b'base')
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129 return frozenset(r for r in maymutable if getphase(repo, r))
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130 return frozenset()
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131
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132
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133 def computeimpactable(repo, visibilityexceptions=None):
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134 """Everything impactable by mutable revision
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135
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136 The immutable filter still have some chance to get invalidated. This will
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137 happen when:
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138
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139 - you garbage collect hidden changeset,
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140 - public phase is moved backward,
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141 - something is changed in the filtering (this could be fixed)
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142
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143 This filter out any mutable changeset and any public changeset that may be
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144 impacted by something happening to a mutable revision.
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145
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146 This is achieved by filtered everything with a revision number egal or
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147 higher than the first mutable changeset is filtered."""
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148 assert not repo.changelog.filteredrevs
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149 cl = repo.changelog
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150 firstmutable = len(cl)
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151 for roots in repo._phasecache.phaseroots[1:]:
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152 if roots:
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153 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots))
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154 # protect from nullrev root
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155 firstmutable = max(0, firstmutable)
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156 return frozenset(pycompat.xrange(firstmutable, len(cl)))
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157
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158
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159 # function to compute filtered set
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160 #
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161 # When adding a new filter you MUST update the table at:
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162 # mercurial.utils.repoviewutil.subsettable
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163 # Otherwise your filter will have to recompute all its branches cache
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164 # from scratch (very slow).
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165 filtertable = {
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166 b'visible': computehidden,
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167 b'visible-hidden': computehidden,
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168 b'served.hidden': computesecret,
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169 b'served': computeunserved,
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170 b'immutable': computemutable,
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171 b'base': computeimpactable,
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172 }
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173
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174 _basefiltername = list(filtertable)
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175
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176
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177 def extrafilter(ui):
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178 """initialize extra filter and return its id
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179
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180 If extra filtering is configured, we make sure the associated filtered view
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181 are declared and return the associated id.
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182 """
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183 frevs = ui.config(b'experimental', b'extra-filter-revs')
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184 if frevs is None:
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185 return None
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186
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187 fid = pycompat.sysbytes(util.DIGESTS[b'sha1'](frevs).hexdigest())[:12]
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188
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189 combine = lambda fname: fname + b'%' + fid
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190
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191 subsettable = repoviewutil.subsettable
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192
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193 if combine(b'base') not in filtertable:
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194 for name in _basefiltername:
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195
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196 def extrafilteredrevs(repo, *args, **kwargs):
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197 baserevs = filtertable[name](repo, *args, **kwargs)
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198 extrarevs = frozenset(repo.revs(frevs))
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199 return baserevs | extrarevs
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200
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201 filtertable[combine(name)] = extrafilteredrevs
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202 if name in subsettable:
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203 subsettable[combine(name)] = combine(subsettable[name])
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204 return fid
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205
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206
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207 def filterrevs(repo, filtername, visibilityexceptions=None):
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208 """returns set of filtered revision for this filter name
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209
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210 visibilityexceptions is a set of revs which must are exceptions for
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211 hidden-state and must be visible. They are dynamic and hence we should not
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212 cache it's result"""
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213 if filtername not in repo.filteredrevcache:
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214 func = filtertable[filtername]
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215 if visibilityexceptions:
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216 return func(repo.unfiltered, visibilityexceptions)
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217 repo.filteredrevcache[filtername] = func(repo.unfiltered())
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218 return repo.filteredrevcache[filtername]
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219
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220
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221 def wrapchangelog(unfichangelog, filteredrevs):
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222 cl = copy.copy(unfichangelog)
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223 cl.filteredrevs = filteredrevs
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224
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225 class filteredchangelog(cl.__class__):
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226 def tiprev(self):
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227 """filtered version of revlog.tiprev"""
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228 for i in pycompat.xrange(len(self) - 1, -2, -1):
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229 if i not in self.filteredrevs:
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230 return i
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231
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232 def __contains__(self, rev):
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233 """filtered version of revlog.__contains__"""
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234 return 0 <= rev < len(self) and rev not in self.filteredrevs
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235
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236 cl.__class__ = filteredchangelog
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237
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238 return cl
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239
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240
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241 class repoview(object):
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242 """Provide a read/write view of a repo through a filtered changelog
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243
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244 This object is used to access a filtered version of a repository without
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245 altering the original repository object itself. We can not alter the
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246 original object for two main reasons:
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247 - It prevents the use of a repo with multiple filters at the same time. In
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248 particular when multiple threads are involved.
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249 - It makes scope of the filtering harder to control.
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250
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251 This object behaves very closely to the original repository. All attribute
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252 operations are done on the original repository:
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253 - An access to `repoview.someattr` actually returns `repo.someattr`,
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254 - A write to `repoview.someattr` actually sets value of `repo.someattr`,
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255 - A deletion of `repoview.someattr` actually drops `someattr`
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256 from `repo.__dict__`.
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257
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258 The only exception is the `changelog` property. It is overridden to return
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259 a (surface) copy of `repo.changelog` with some revisions filtered. The
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260 `filtername` attribute of the view control the revisions that need to be
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261 filtered. (the fact the changelog is copied is an implementation detail).
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262
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263 Unlike attributes, this object intercepts all method calls. This means that
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264 all methods are run on the `repoview` object with the filtered `changelog`
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265 property. For this purpose the simple `repoview` class must be mixed with
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266 the actual class of the repository. This ensures that the resulting
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267 `repoview` object have the very same methods than the repo object. This
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268 leads to the property below.
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269
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270 repoview.method() --> repo.__class__.method(repoview)
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271
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272 The inheritance has to be done dynamically because `repo` can be of any
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273 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`.
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274 """
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275
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276 def __init__(self, repo, filtername, visibilityexceptions=None):
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277 object.__setattr__(self, r'_unfilteredrepo', repo)
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278 object.__setattr__(self, r'filtername', filtername)
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279 object.__setattr__(self, r'_clcachekey', None)
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280 object.__setattr__(self, r'_clcache', None)
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281 # revs which are exceptions and must not be hidden
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282 object.__setattr__(self, r'_visibilityexceptions', visibilityexceptions)
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283
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284 # not a propertycache on purpose we shall implement a proper cache later
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285 @property
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286 def changelog(self):
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287 """return a filtered version of the changeset
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288
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289 this changelog must not be used for writing"""
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290 # some cache may be implemented later
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291 unfi = self._unfilteredrepo
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292 unfichangelog = unfi.changelog
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293 # bypass call to changelog.method
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294 unfiindex = unfichangelog.index
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295 unfilen = len(unfiindex)
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296 unfinode = unfiindex[unfilen - 1][7]
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297 with util.timedcm('repo filter for %s', self.filtername):
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298 revs = filterrevs(unfi, self.filtername, self._visibilityexceptions)
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299 cl = self._clcache
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300 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed)
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301 # if cl.index is not unfiindex, unfi.changelog would be
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302 # recreated, and our clcache refers to garbage object
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303 if cl is not None and (
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304 cl.index is not unfiindex or newkey != self._clcachekey
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305 ):
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306 cl = None
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307 # could have been made None by the previous if
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308 if cl is None:
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309 cl = wrapchangelog(unfichangelog, revs)
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310 object.__setattr__(self, r'_clcache', cl)
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311 object.__setattr__(self, r'_clcachekey', newkey)
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312 return cl
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313
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314 def unfiltered(self):
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315 """Return an unfiltered version of a repo"""
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316 return self._unfilteredrepo
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317
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318 def filtered(self, name, visibilityexceptions=None):
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319 """Return a filtered version of a repository"""
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320 if name == self.filtername and not visibilityexceptions:
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321 return self
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322 return self.unfiltered().filtered(name, visibilityexceptions)
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323
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324 def __repr__(self):
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325 return r'<%s:%s %r>' % (
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326 self.__class__.__name__,
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327 pycompat.sysstr(self.filtername),
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328 self.unfiltered(),
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329 )
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330
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331 # everything access are forwarded to the proxied repo
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332 def __getattr__(self, attr):
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333 return getattr(self._unfilteredrepo, attr)
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334
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335 def __setattr__(self, attr, value):
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336 return setattr(self._unfilteredrepo, attr, value)
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337
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338 def __delattr__(self, attr):
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339 return delattr(self._unfilteredrepo, attr)
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340
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341
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342 # Python <3.4 easily leaks types via __mro__. See
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343 # https://bugs.python.org/issue17950. We cache dynamically created types
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344 # so they won't be leaked on every invocation of repo.filtered().
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345 _filteredrepotypes = weakref.WeakKeyDictionary()
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346
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347
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348 def newtype(base):
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349 """Create a new type with the repoview mixin and the given base class"""
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350 if base not in _filteredrepotypes:
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351
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352 class filteredrepo(repoview, base):
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353 pass
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354
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355 _filteredrepotypes[base] = filteredrepo
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356 return _filteredrepotypes[base]