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annotate mercurial/repoview.py @ 18426:01638b51df44

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hgweb: ignore filtered revision in revnav This changeset checks that a revision is known before adding it to the navigation. This will prevent traceback on filtered repository. This changeset result in an incorrect behaviors, Navigation link may be dropped without any replacement. However this bad navigation generation is much better than a crash
author Pierre-Yves David <pierre-yves.david@logilab.fr>
date Wed, 16 Jan 2013 14:19:28 +0100
parents f3b21beb9802
children 64848f7fb764
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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 import copy
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10 import phases
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11 import util
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12 import obsolete, bookmarks, revset
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13
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14
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15 def hideablerevs(repo):
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16 """Revisions candidates to be hidden
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17
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18 This is a standalone function to help extensions to wrap it."""
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19 return obsolete.getrevs(repo, 'obsolete')
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20
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21 def computehidden(repo):
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22 """compute the set of hidden revision to filter
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23
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24 During most operation hidden should be filtered."""
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25 assert not repo.changelog.filteredrevs
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26 hideable = hideablerevs(repo)
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27 if hideable:
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28 cl = repo.changelog
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29 firsthideable = min(hideable)
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30 revs = cl.revs(start=firsthideable)
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31 blockers = [r for r in revset._children(repo, revs, hideable)
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32 if r not in hideable]
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33 for par in repo[None].parents():
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34 blockers.append(par.rev())
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35 for bm in bookmarks.listbookmarks(repo).values():
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36 blockers.append(repo[bm].rev())
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37 blocked = cl.ancestors(blockers, inclusive=True)
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38 return frozenset(r for r in hideable if r not in blocked)
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39 return frozenset()
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40
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41 def computeunserved(repo):
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42 """compute the set of revision that should be filtered when used a server
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43
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44 Secret and hidden changeset should not pretend to be here."""
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45 assert not repo.changelog.filteredrevs
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46 # fast path in simple case to avoid impact of non optimised code
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47 hiddens = filterrevs(repo, 'visible')
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48 if phases.hassecret(repo):
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49 cl = repo.changelog
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50 secret = phases.secret
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51 getphase = repo._phasecache.phase
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52 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret])
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53 revs = cl.revs(start=first)
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54 secrets = set(r for r in revs if getphase(repo, r) >= secret)
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55 return frozenset(hiddens | secrets)
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56 else:
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57 return hiddens
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58 return frozenset()
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59
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60 def computemutable(repo):
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61 """compute the set of revision that should be filtered when used a server
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62
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63 Secret and hidden changeset should not pretend to be here."""
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64 assert not repo.changelog.filteredrevs
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65 # fast check to avoid revset call on huge repo
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66 if util.any(repo._phasecache.phaseroots[1:]):
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67 getphase = repo._phasecache.phase
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68 maymutable = filterrevs(repo, 'base')
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69 return frozenset(r for r in maymutable if getphase(repo, r))
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70 return frozenset()
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71
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72 def computeimpactable(repo):
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73 """Everything impactable by mutable revision
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74
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75 The mutable filter still have some chance to get invalidated. This will
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76 happen when:
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77
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78 - you garbage collect hidden changeset,
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79 - public phase is moved backward,
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80 - something is changed in the filtering (this could be fixed)
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81
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82 This filter out any mutable changeset and any public changeset that may be
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83 impacted by something happening to a mutable revision.
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84
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85 This is achieved by filtered everything with a revision number egal or
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86 higher than the first mutable changeset is filtered."""
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87 assert not repo.changelog.filteredrevs
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88 cl = repo.changelog
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89 firstmutable = len(cl)
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90 for roots in repo._phasecache.phaseroots[1:]:
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91 if roots:
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92 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots))
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93 return frozenset(xrange(firstmutable, len(cl)))
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94
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95 # function to compute filtered set
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96 filtertable = {'visible': computehidden,
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97 'served': computeunserved,
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98 'immutable': computemutable,
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99 'base': computeimpactable}
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100 ### Nearest subset relation
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101 # Nearest subset of filter X is a filter Y so that:
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102 # * Y is included in X,
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103 # * X - Y is as small as possible.
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104 # This create and ordering used for branchmap purpose.
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105 # the ordering may be partial
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106 subsettable = {None: 'visible',
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107 'visible': 'served',
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108 'served': 'immutable',
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109 'immutable': 'base'}
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110
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111 def filterrevs(repo, filtername):
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112 """returns set of filtered revision for this filter name"""
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113 if filtername not in repo.filteredrevcache:
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114 func = filtertable[filtername]
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115 repo.filteredrevcache[filtername] = func(repo.unfiltered())
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116 return repo.filteredrevcache[filtername]
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117
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118 class repoview(object):
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119 """Provide a read/write view of a repo through a filtered changelog
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120
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121 This object is used to access a filtered version of a repository without
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122 altering the original repository object itself. We can not alter the
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123 original object for two main reasons:
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124 - It prevents the use of a repo with multiple filters at the same time. In
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125 particular when multiple threads are involved.
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126 - It makes scope of the filtering harder to control.
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127
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128 This object behaves very closely to the original repository. All attribute
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129 operations are done on the original repository:
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130 - An access to `repoview.someattr` actually returns `repo.someattr`,
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131 - A write to `repoview.someattr` actually sets value of `repo.someattr`,
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132 - A deletion of `repoview.someattr` actually drops `someattr`
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133 from `repo.__dict__`.
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134
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135 The only exception is the `changelog` property. It is overridden to return
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136 a (surface) copy of `repo.changelog` with some revisions filtered. The
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137 `filtername` attribute of the view control the revisions that need to be
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138 filtered. (the fact the changelog is copied is an implementation detail).
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139
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140 Unlike attributes, this object intercepts all method calls. This means that
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141 all methods are run on the `repoview` object with the filtered `changelog`
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142 property. For this purpose the simple `repoview` class must be mixed with
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143 the actual class of the repository. This ensures that the resulting
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144 `repoview` object have the very same methods than the repo object. This
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145 leads to the property below.
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146
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147 repoview.method() --> repo.__class__.method(repoview)
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148
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149 The inheritance has to be done dynamically because `repo` can be of any
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150 subclasses of `localrepo`. Eg: `bundlerepo` or `httprepo`.
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151 """
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152
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153 def __init__(self, repo, filtername):
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154 object.__setattr__(self, '_unfilteredrepo', repo)
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155 object.__setattr__(self, 'filtername', filtername)
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156
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157 # not a cacheproperty on purpose we shall implement a proper cache later
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158 @property
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159 def changelog(self):
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160 """return a filtered version of the changeset
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161
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162 this changelog must not be used for writing"""
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163 # some cache may be implemented later
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164 cl = copy.copy(self._unfilteredrepo.changelog)
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165 cl.filteredrevs = filterrevs(self._unfilteredrepo, self.filtername)
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166 return cl
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167
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168 def unfiltered(self):
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169 """Return an unfiltered version of a repo"""
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170 return self._unfilteredrepo
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171
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172 def filtered(self, name):
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173 """Return a filtered version of a repository"""
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174 if name == self.filtername:
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175 return self
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176 return self.unfiltered().filtered(name)
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177
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178 # everything access are forwarded to the proxied repo
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179 def __getattr__(self, attr):
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180 return getattr(self._unfilteredrepo, attr)
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181
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182 def __setattr__(self, attr, value):
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183 return setattr(self._unfilteredrepo, attr, value)
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184
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185 def __delattr__(self, attr):
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186 return delattr(self._unfilteredrepo, attr)
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187
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188 # The `requirement` attribut is initialiazed during __init__. But
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189 # __getattr__ won't be called as it also exists on the class. We need
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190 # explicit forwarding to main repo here
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191 @property
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192 def requirements(self):
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193 return self._unfilteredrepo.requirements
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194