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annotate mercurial/repoview.py @ 18293:1f35d6737ed8

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repoview: extract hideable revision computation in a dedicated function This will help extensions to plug into the hidden mechanism.
author Pierre-Yves David <pierre-yves.david@logilab.fr>
date Thu, 10 Jan 2013 10:25:02 +0100
parents 254b708fd37d
children f3b21beb9802
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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 = filteredrevs(repo, 'hidden')
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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 = filteredrevs(repo, 'impactable')
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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 = {'hidden': computehidden,
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97 'unserved': computeunserved,
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98 'mutable': computemutable,
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99 'impactable': 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: 'hidden',
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107 'hidden': 'unserved',
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108 'unserved': 'mutable',
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109 'mutable': 'impactable'}
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110
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111 def filteredrevs(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 = filteredrevs(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