Mercurial > hg
annotate mercurial/repoview.py @ 27916:9a09a9cfa503 stable
repoview: add missing newline character in debug prints
author | Laurent Charignon <lcharignon@fb.com> |
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date | Wed, 20 Jan 2016 13:40:59 -0800 |
parents | beda2c9dbbff |
children | 97e0dc6d248c |
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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 heapq |
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13 import struct |
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14 |
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15 from .node import nullrev |
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16 from . import ( |
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17 error, |
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18 obsolete, |
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19 phases, |
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20 tags as tagsmod, |
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21 util, |
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22 ) |
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23 |
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24 def hideablerevs(repo): |
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25 """Revisions candidates to be hidden |
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26 |
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27 This is a standalone function to help extensions to wrap it.""" |
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28 return obsolete.getrevs(repo, 'obsolete') |
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29 |
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30 def _getstatichidden(repo): |
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31 """Revision to be hidden (disregarding dynamic blocker) |
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32 |
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33 To keep a consistent graph, we cannot hide any revisions with |
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34 non-hidden descendants. This function computes the set of |
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35 revisions that could be hidden while keeping the graph consistent. |
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36 |
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37 A second pass will be done to apply "dynamic blocker" like bookmarks or |
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38 working directory parents. |
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39 |
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40 """ |
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41 assert not repo.changelog.filteredrevs |
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42 hidden = set(hideablerevs(repo)) |
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43 if hidden: |
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44 getphase = repo._phasecache.phase |
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45 getparentrevs = repo.changelog.parentrevs |
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46 # Skip heads which are public (guaranteed to not be hidden) |
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47 heap = [-r for r in repo.changelog.headrevs() if getphase(repo, r)] |
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48 heapq.heapify(heap) |
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49 heappop = heapq.heappop |
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50 heappush = heapq.heappush |
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51 seen = set() # no need to init it with heads, they have no children |
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52 while heap: |
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53 rev = -heappop(heap) |
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54 # All children have been processed so at that point, if no children |
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55 # removed 'rev' from the 'hidden' set, 'rev' is going to be hidden. |
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56 blocker = rev not in hidden |
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57 for parent in getparentrevs(rev): |
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58 if parent == nullrev: |
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59 continue |
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60 if blocker: |
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61 # If visible, ensure parent will be visible too |
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62 hidden.discard(parent) |
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63 # - Avoid adding the same revision twice |
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64 # - Skip nodes which are public (guaranteed to not be hidden) |
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65 pre = len(seen) |
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66 seen.add(parent) |
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67 if pre < len(seen) and getphase(repo, rev): |
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68 heappush(heap, -parent) |
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69 return hidden |
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70 |
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71 def _getdynamicblockers(repo): |
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72 """Non-cacheable revisions blocking hidden changesets from being filtered. |
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73 |
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74 Get revisions that will block hidden changesets and are likely to change, |
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75 but unlikely to create hidden blockers. They won't be cached, so be careful |
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76 with adding additional computation.""" |
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77 |
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78 cl = repo.changelog |
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79 blockers = set() |
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80 blockers.update([par.rev() for par in repo[None].parents()]) |
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81 blockers.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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82 |
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83 tags = {} |
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84 tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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85 if tags: |
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86 rev, nodemap = cl.rev, cl.nodemap |
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87 blockers.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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88 return blockers |
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89 |
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90 cacheversion = 1 |
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91 cachefile = 'cache/hidden' |
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92 |
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93 def cachehash(repo, hideable): |
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94 """return sha1 hash of repository data to identify a valid cache. |
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95 |
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96 We calculate a sha1 of repo heads and the content of the obsstore and write |
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97 it to the cache. Upon reading we can easily validate by checking the hash |
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98 against the stored one and discard the cache in case the hashes don't match. |
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99 """ |
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100 h = util.sha1() |
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101 h.update(''.join(repo.heads())) |
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102 h.update(str(hash(frozenset(hideable)))) |
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103 return h.digest() |
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104 |
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105 def _writehiddencache(cachefile, cachehash, hidden): |
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106 """write hidden data to a cache file""" |
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107 data = struct.pack('>%ii' % len(hidden), *sorted(hidden)) |
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108 cachefile.write(struct.pack(">H", cacheversion)) |
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109 cachefile.write(cachehash) |
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110 cachefile.write(data) |
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111 |
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112 def trywritehiddencache(repo, hideable, hidden): |
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113 """write cache of hidden changesets to disk |
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114 |
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115 Will not write the cache if a wlock cannot be obtained lazily. |
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116 The cache consists of a head of 22byte: |
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117 2 byte version number of the cache |
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118 20 byte sha1 to validate the cache |
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119 n*4 byte hidden revs |
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120 """ |
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121 wlock = fh = None |
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122 try: |
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123 wlock = repo.wlock(wait=False) |
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124 # write cache to file |
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125 newhash = cachehash(repo, hideable) |
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126 fh = repo.vfs.open(cachefile, 'w+b', atomictemp=True) |
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127 _writehiddencache(fh, newhash, hidden) |
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128 except (IOError, OSError): |
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129 repo.ui.debug('error writing hidden changesets cache\n') |
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130 except error.LockHeld: |
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131 repo.ui.debug('cannot obtain lock to write hidden changesets cache\n') |
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132 finally: |
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133 if fh: |
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134 fh.close() |
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135 if wlock: |
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136 wlock.release() |
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137 |
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138 def tryreadcache(repo, hideable): |
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139 """read a cache if the cache exists and is valid, otherwise returns None.""" |
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140 hidden = fh = None |
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141 try: |
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142 if repo.vfs.exists(cachefile): |
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143 fh = repo.vfs.open(cachefile, 'rb') |
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144 version, = struct.unpack(">H", fh.read(2)) |
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145 oldhash = fh.read(20) |
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146 newhash = cachehash(repo, hideable) |
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147 if (cacheversion, oldhash) == (version, newhash): |
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148 # cache is valid, so we can start reading the hidden revs |
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149 data = fh.read() |
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150 count = len(data) / 4 |
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151 hidden = frozenset(struct.unpack('>%ii' % count, data)) |
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152 return hidden |
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153 finally: |
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154 if fh: |
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155 fh.close() |
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156 |
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157 def computehidden(repo): |
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158 """compute the set of hidden revision to filter |
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159 |
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160 During most operation hidden should be filtered.""" |
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161 assert not repo.changelog.filteredrevs |
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162 |
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163 hidden = frozenset() |
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164 hideable = hideablerevs(repo) |
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165 if hideable: |
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166 cl = repo.changelog |
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167 hidden = tryreadcache(repo, hideable) |
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168 if hidden is None: |
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169 hidden = frozenset(_getstatichidden(repo)) |
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170 trywritehiddencache(repo, hideable, hidden) |
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171 |
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172 # check if we have wd parents, bookmarks or tags pointing to hidden |
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173 # changesets and remove those. |
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174 dynamic = hidden & _getdynamicblockers(repo) |
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175 if dynamic: |
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176 blocked = cl.ancestors(dynamic, inclusive=True) |
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177 hidden = frozenset(r for r in hidden if r not in blocked) |
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178 return hidden |
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179 |
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180 def computeunserved(repo): |
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181 """compute the set of revision that should be filtered when used a server |
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182 |
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183 Secret and hidden changeset should not pretend to be here.""" |
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184 assert not repo.changelog.filteredrevs |
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185 # fast path in simple case to avoid impact of non optimised code |
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186 hiddens = filterrevs(repo, 'visible') |
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187 if phases.hassecret(repo): |
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188 cl = repo.changelog |
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189 secret = phases.secret |
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190 getphase = repo._phasecache.phase |
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191 first = min(cl.rev(n) for n in repo._phasecache.phaseroots[secret]) |
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192 revs = cl.revs(start=first) |
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193 secrets = set(r for r in revs if getphase(repo, r) >= secret) |
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194 return frozenset(hiddens | secrets) |
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195 else: |
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196 return hiddens |
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197 |
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198 def computemutable(repo): |
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199 """compute the set of revision that should be filtered when used a server |
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200 |
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201 Secret and hidden changeset should not pretend to be here.""" |
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202 assert not repo.changelog.filteredrevs |
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203 # fast check to avoid revset call on huge repo |
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204 if any(repo._phasecache.phaseroots[1:]): |
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205 getphase = repo._phasecache.phase |
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206 maymutable = filterrevs(repo, 'base') |
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207 return frozenset(r for r in maymutable if getphase(repo, r)) |
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208 return frozenset() |
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209 |
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210 def computeimpactable(repo): |
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211 """Everything impactable by mutable revision |
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212 |
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213 The immutable filter still have some chance to get invalidated. This will |
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214 happen when: |
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215 |
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216 - you garbage collect hidden changeset, |
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217 - public phase is moved backward, |
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218 - something is changed in the filtering (this could be fixed) |
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219 |
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220 This filter out any mutable changeset and any public changeset that may be |
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221 impacted by something happening to a mutable revision. |
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222 |
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223 This is achieved by filtered everything with a revision number egal or |
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224 higher than the first mutable changeset is filtered.""" |
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225 assert not repo.changelog.filteredrevs |
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226 cl = repo.changelog |
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227 firstmutable = len(cl) |
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228 for roots in repo._phasecache.phaseroots[1:]: |
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229 if roots: |
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230 firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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231 # protect from nullrev root |
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232 firstmutable = max(0, firstmutable) |
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233 return frozenset(xrange(firstmutable, len(cl))) |
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234 |
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235 # function to compute filtered set |
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236 # |
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237 # When adding a new filter you MUST update the table at: |
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238 # mercurial.branchmap.subsettable |
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239 # Otherwise your filter will have to recompute all its branches cache |
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240 # from scratch (very slow). |
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241 filtertable = {'visible': computehidden, |
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242 'served': computeunserved, |
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243 'immutable': computemutable, |
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244 'base': computeimpactable} |
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245 |
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246 def filterrevs(repo, filtername): |
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247 """returns set of filtered revision for this filter name""" |
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248 if filtername not in repo.filteredrevcache: |
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249 func = filtertable[filtername] |
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250 repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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251 return repo.filteredrevcache[filtername] |
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252 |
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253 class repoview(object): |
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254 """Provide a read/write view of a repo through a filtered changelog |
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255 |
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256 This object is used to access a filtered version of a repository without |
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257 altering the original repository object itself. We can not alter the |
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258 original object for two main reasons: |
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259 - It prevents the use of a repo with multiple filters at the same time. In |
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260 particular when multiple threads are involved. |
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261 - It makes scope of the filtering harder to control. |
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262 |
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263 This object behaves very closely to the original repository. All attribute |
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264 operations are done on the original repository: |
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265 - An access to `repoview.someattr` actually returns `repo.someattr`, |
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266 - A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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267 - A deletion of `repoview.someattr` actually drops `someattr` |
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268 from `repo.__dict__`. |
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269 |
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270 The only exception is the `changelog` property. It is overridden to return |
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271 a (surface) copy of `repo.changelog` with some revisions filtered. The |
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272 `filtername` attribute of the view control the revisions that need to be |
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273 filtered. (the fact the changelog is copied is an implementation detail). |
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274 |
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275 Unlike attributes, this object intercepts all method calls. This means that |
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276 all methods are run on the `repoview` object with the filtered `changelog` |
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277 property. For this purpose the simple `repoview` class must be mixed with |
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278 the actual class of the repository. This ensures that the resulting |
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279 `repoview` object have the very same methods than the repo object. This |
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280 leads to the property below. |
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281 |
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282 repoview.method() --> repo.__class__.method(repoview) |
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283 |
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284 The inheritance has to be done dynamically because `repo` can be of any |
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285 subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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286 """ |
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287 |
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288 def __init__(self, repo, filtername): |
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289 object.__setattr__(self, '_unfilteredrepo', repo) |
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290 object.__setattr__(self, 'filtername', filtername) |
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291 object.__setattr__(self, '_clcachekey', None) |
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292 object.__setattr__(self, '_clcache', None) |
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293 |
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294 # not a propertycache on purpose we shall implement a proper cache later |
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295 @property |
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296 def changelog(self): |
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297 """return a filtered version of the changeset |
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298 |
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299 this changelog must not be used for writing""" |
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300 # some cache may be implemented later |
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301 unfi = self._unfilteredrepo |
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302 unfichangelog = unfi.changelog |
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303 # bypass call to changelog.method |
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304 unfiindex = unfichangelog.index |
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305 unfilen = len(unfiindex) - 1 |
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306 unfinode = unfiindex[unfilen - 1][7] |
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307 |
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308 revs = filterrevs(unfi, self.filtername) |
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309 cl = self._clcache |
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310 newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) |
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311 if cl is not None and newkey != self._clcachekey: |
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312 cl = None |
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313 # could have been made None by the previous if |
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314 if cl is None: |
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315 cl = copy.copy(unfichangelog) |
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316 cl.filteredrevs = revs |
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317 object.__setattr__(self, '_clcache', cl) |
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318 object.__setattr__(self, '_clcachekey', newkey) |
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319 return cl |
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320 |
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321 def unfiltered(self): |
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322 """Return an unfiltered version of a repo""" |
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323 return self._unfilteredrepo |
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324 |
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325 def filtered(self, name): |
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326 """Return a filtered version of a repository""" |
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327 if name == self.filtername: |
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328 return self |
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329 return self.unfiltered().filtered(name) |
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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 # The `requirements` attribute is initialized during __init__. But |
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342 # __getattr__ won't be called as it also exists on the class. We need |
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343 # explicit forwarding to main repo here |
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344 @property |
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345 def requirements(self): |
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346 return self._unfilteredrepo.requirements |