Mercurial > hg
annotate mercurial/repoview.py @ 23378:47091002ae62
repoview: extract actual hidden cache writing in its own function
This will allow the generation of this cache within the transaction. Relying on
the transaction will reduce the chance of reader seeing bad cache.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Thu, 13 Nov 2014 11:11:17 +0000 |
parents | 90200e864ffc |
children | ced3ecfc2e57 |
rev | line source |
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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 error |
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11 import phases |
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12 import util |
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13 import obsolete |
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14 import struct |
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15 import tags as tagsmod |
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16 |
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17 def hideablerevs(repo): |
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18 """Revisions candidates to be hidden |
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19 |
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20 This is a standalone function to help extensions to wrap it.""" |
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21 return obsolete.getrevs(repo, 'obsolete') |
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22 |
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23 def _getstaticblockers(repo): |
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24 """Cacheable revisions blocking hidden changesets from being filtered. |
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25 |
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26 Additional non-cached hidden blockers are computed in _getdynamicblockers. |
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27 This is a standalone function to help extensions to wrap it.""" |
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28 assert not repo.changelog.filteredrevs |
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29 hideable = hideablerevs(repo) |
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30 blockers = set() |
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31 if hideable: |
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32 # We use cl to avoid recursive lookup from repo[xxx] |
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33 cl = repo.changelog |
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34 firsthideable = min(hideable) |
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35 revs = cl.revs(start=firsthideable) |
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36 tofilter = repo.revs( |
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37 '(%ld) and children(%ld)', list(revs), list(hideable)) |
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38 blockers.update([r for r in tofilter if r not in hideable]) |
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39 return blockers |
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40 |
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41 def _getdynamicblockers(repo): |
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42 """Non-cacheable revisions blocking hidden changesets from being filtered. |
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43 |
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44 Get revisions that will block hidden changesets and are likely to change, |
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45 but unlikely to create hidden blockers. They won't be cached, so be careful |
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46 with adding additional computation.""" |
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47 |
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48 cl = repo.changelog |
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49 blockers = set() |
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50 blockers.update([par.rev() for par in repo[None].parents()]) |
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51 blockers.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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52 |
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53 tags = {} |
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54 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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55 if tags: |
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56 rev, nodemap = cl.rev, cl.nodemap |
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57 blockers.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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58 return blockers |
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59 |
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60 cacheversion = 1 |
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61 cachefile = 'cache/hidden' |
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62 |
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63 def cachehash(repo, hideable): |
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64 """return sha1 hash of repository data to identify a valid cache. |
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65 |
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66 We calculate a sha1 of repo heads and the content of the obsstore and write |
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67 it to the cache. Upon reading we can easily validate by checking the hash |
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68 against the stored one and discard the cache in case the hashes don't match. |
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69 """ |
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70 h = util.sha1() |
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71 h.update(''.join(repo.heads())) |
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72 h.update(str(hash(frozenset(hideable)))) |
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73 return h.digest() |
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74 |
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75 def _writehiddencache(cachefile, cachehash, hidden): |
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76 """write hidden data to a cache file""" |
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77 data = struct.pack('>%ii' % len(hidden), *sorted(hidden)) |
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78 cachefile.write(struct.pack(">H", cacheversion)) |
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79 cachefile.write(cachehash) |
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80 cachefile.write(data) |
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81 |
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82 def trywritehiddencache(repo, hideable, hidden): |
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83 """write cache of hidden changesets to disk |
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84 |
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85 Will not write the cache if a wlock cannot be obtained lazily. |
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86 The cache consists of a head of 22byte: |
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87 2 byte version number of the cache |
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88 20 byte sha1 to validate the cache |
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89 n*4 byte hidden revs |
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90 """ |
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91 wlock = fh = None |
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92 try: |
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93 try: |
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94 wlock = repo.wlock(wait=False) |
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95 # write cache to file |
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96 newhash = cachehash(repo, hideable) |
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97 fh = repo.vfs.open(cachefile, 'w+b', atomictemp=True) |
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98 _writehiddencache(fh, newhash, hidden) |
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99 except (IOError, OSError): |
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100 repo.ui.debug('error writing hidden changesets cache') |
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101 except error.LockHeld: |
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102 repo.ui.debug('cannot obtain lock to write hidden changesets cache') |
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103 finally: |
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104 if fh: |
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105 fh.close() |
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106 if wlock: |
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107 wlock.release() |
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108 |
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109 def tryreadcache(repo, hideable): |
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110 """read a cache if the cache exists and is valid, otherwise returns None.""" |
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111 hidden = fh = None |
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112 try: |
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113 if repo.vfs.exists(cachefile): |
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114 fh = repo.vfs.open(cachefile, 'rb') |
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115 version, = struct.unpack(">H", fh.read(2)) |
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116 oldhash = fh.read(20) |
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117 newhash = cachehash(repo, hideable) |
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118 if (cacheversion, oldhash) == (version, newhash): |
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119 # cache is valid, so we can start reading the hidden revs |
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120 data = fh.read() |
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121 count = len(data) / 4 |
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122 hidden = frozenset(struct.unpack('>%ii' % count, data)) |
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123 return hidden |
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124 finally: |
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125 if fh: |
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126 fh.close() |
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127 |
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128 def computehidden(repo): |
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129 """compute the set of hidden revision to filter |
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130 |
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131 During most operation hidden should be filtered.""" |
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132 assert not repo.changelog.filteredrevs |
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133 |
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134 hidden = frozenset() |
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135 hideable = hideablerevs(repo) |
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136 if hideable: |
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137 cl = repo.changelog |
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138 hidden = tryreadcache(repo, hideable) |
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139 if hidden is None: |
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140 blocked = cl.ancestors(_getstaticblockers(repo), inclusive=True) |
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141 hidden = frozenset(r for r in hideable if r not in blocked) |
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142 trywritehiddencache(repo, hideable, hidden) |
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143 |
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144 # check if we have wd parents, bookmarks or tags pointing to hidden |
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145 # changesets and remove those. |
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146 dynamic = hidden & _getdynamicblockers(repo) |
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147 if dynamic: |
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148 blocked = cl.ancestors(dynamic, inclusive=True) |
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149 hidden = frozenset(r for r in hidden if r not in blocked) |
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150 return hidden |
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151 |
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152 def computeunserved(repo): |
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153 """compute the set of revision that should be filtered when used a server |
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154 |
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155 Secret and hidden changeset should not pretend to be here.""" |
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156 assert not repo.changelog.filteredrevs |
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157 # fast path in simple case to avoid impact of non optimised code |
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158 hiddens = filterrevs(repo, 'visible') |
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159 if phases.hassecret(repo): |
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160 cl = repo.changelog |
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161 secret = phases.secret |
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162 getphase = repo._phasecache.phase |
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163 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret]) |
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164 revs = cl.revs(start=first) |
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165 secrets = set(r for r in revs if getphase(repo, r) >= secret) |
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166 return frozenset(hiddens | secrets) |
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167 else: |
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168 return hiddens |
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169 |
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170 def computemutable(repo): |
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171 """compute the set of revision that should be filtered when used a server |
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172 |
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173 Secret and hidden changeset should not pretend to be here.""" |
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174 assert not repo.changelog.filteredrevs |
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175 # fast check to avoid revset call on huge repo |
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176 if util.any(repo._phasecache.phaseroots[1:]): |
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177 getphase = repo._phasecache.phase |
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178 maymutable = filterrevs(repo, 'base') |
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179 return frozenset(r for r in maymutable if getphase(repo, r)) |
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180 return frozenset() |
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181 |
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182 def computeimpactable(repo): |
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183 """Everything impactable by mutable revision |
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184 |
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185 The immutable filter still have some chance to get invalidated. This will |
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186 happen when: |
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187 |
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188 - you garbage collect hidden changeset, |
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189 - public phase is moved backward, |
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190 - something is changed in the filtering (this could be fixed) |
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191 |
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192 This filter out any mutable changeset and any public changeset that may be |
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193 impacted by something happening to a mutable revision. |
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194 |
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195 This is achieved by filtered everything with a revision number egal or |
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196 higher than the first mutable changeset is filtered.""" |
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197 assert not repo.changelog.filteredrevs |
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198 cl = repo.changelog |
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199 firstmutable = len(cl) |
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200 for roots in repo._phasecache.phaseroots[1:]: |
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201 if roots: |
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202 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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203 # protect from nullrev root |
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204 firstmutable = max(0, firstmutable) |
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205 return frozenset(xrange(firstmutable, len(cl))) |
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206 |
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207 # function to compute filtered set |
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208 # |
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209 # When adding a new filter you MUST update the table at: |
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210 # mercurial.branchmap.subsettable |
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211 # Otherwise your filter will have to recompute all its branches cache |
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212 # from scratch (very slow). |
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213 filtertable = {'visible': computehidden, |
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214 'served': computeunserved, |
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215 'immutable': computemutable, |
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216 'base': computeimpactable} |
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217 |
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218 def filterrevs(repo, filtername): |
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219 """returns set of filtered revision for this filter name""" |
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220 if filtername not in repo.filteredrevcache: |
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221 func = filtertable[filtername] |
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222 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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223 return repo.filteredrevcache[filtername] |
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224 |
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225 class repoview(object): |
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226 """Provide a read/write view of a repo through a filtered changelog |
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227 |
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228 This object is used to access a filtered version of a repository without |
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229 altering the original repository object itself. We can not alter the |
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230 original object for two main reasons: |
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231 - It prevents the use of a repo with multiple filters at the same time. In |
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232 particular when multiple threads are involved. |
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233 - It makes scope of the filtering harder to control. |
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234 |
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235 This object behaves very closely to the original repository. All attribute |
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236 operations are done on the original repository: |
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237 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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238 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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239 - A deletion of `repoview.someattr` actually drops `someattr` |
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240 from `repo.__dict__`. |
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241 |
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242 The only exception is the `changelog` property. It is overridden to return |
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243 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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244 `filtername` attribute of the view control the revisions that need to be |
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245 filtered. (the fact the changelog is copied is an implementation detail). |
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246 |
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247 Unlike attributes, this object intercepts all method calls. This means that |
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248 all methods are run on the `repoview` object with the filtered `changelog` |
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249 property. For this purpose the simple `repoview` class must be mixed with |
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250 the actual class of the repository. This ensures that the resulting |
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251 `repoview` object have the very same methods than the repo object. This |
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252 leads to the property below. |
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253 |
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254 repoview.method() --> repo.__class__.method(repoview) |
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255 |
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256 The inheritance has to be done dynamically because `repo` can be of any |
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257 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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258 """ |
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259 |
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260 def __init__(self, repo, filtername): |
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261 object.__setattr__(self, '_unfilteredrepo', repo) |
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262 object.__setattr__(self, 'filtername', filtername) |
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263 object.__setattr__(self, '_clcachekey', None) |
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264 object.__setattr__(self, '_clcache', None) |
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265 |
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266 # not a propertycache on purpose we shall implement a proper cache later |
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267 @property |
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268 def changelog(self): |
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269 """return a filtered version of the changeset |
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270 |
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271 this changelog must not be used for writing""" |
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272 # some cache may be implemented later |
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273 unfi = self._unfilteredrepo |
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274 unfichangelog = unfi.changelog |
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275 revs = filterrevs(unfi, self.filtername) |
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276 cl = self._clcache |
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277 newkey = (len(unfichangelog), unfichangelog.tip(), hash(revs)) |
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278 if cl is not None: |
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279 # we need to check curkey too for some obscure reason. |
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280 # MQ test show a corruption of the underlying repo (in _clcache) |
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281 # without change in the cachekey. |
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282 oldfilter = cl.filteredrevs |
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283 try: |
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284 cl.filteredrevs = () # disable filtering for tip |
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285 curkey = (len(cl), cl.tip(), hash(oldfilter)) |
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286 finally: |
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287 cl.filteredrevs = oldfilter |
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288 if newkey != self._clcachekey or newkey != curkey: |
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289 cl = None |
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290 # could have been made None by the previous if |
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291 if cl is None: |
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292 cl = copy.copy(unfichangelog) |
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293 cl.filteredrevs = revs |
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294 object.__setattr__(self, '_clcache', cl) |
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295 object.__setattr__(self, '_clcachekey', newkey) |
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296 return cl |
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297 |
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298 def unfiltered(self): |
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299 """Return an unfiltered version of a repo""" |
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300 return self._unfilteredrepo |
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301 |
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302 def filtered(self, name): |
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303 """Return a filtered version of a repository""" |
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304 if name == self.filtername: |
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305 return self |
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306 return self.unfiltered().filtered(name) |
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307 |
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308 # everything access are forwarded to the proxied repo |
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309 def __getattr__(self, attr): |
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310 return getattr(self._unfilteredrepo, attr) |
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311 |
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312 def __setattr__(self, attr, value): |
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313 return setattr(self._unfilteredrepo, attr, value) |
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314 |
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315 def __delattr__(self, attr): |
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316 return delattr(self._unfilteredrepo, attr) |
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317 |
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318 # The `requirements` attribute is initialized during __init__. But |
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319 # __getattr__ won't be called as it also exists on the class. We need |
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320 # explicit forwarding to main repo here |
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321 @property |
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322 def requirements(self): |
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323 return self._unfilteredrepo.requirements |