Mercurial > hg
annotate mercurial/tags.py @ 9151:f528d1a93491
tags: implement persistent tag caching (issue548).
- rename findglobaltags() to findglobaltags1() (so the "no cache"
implementation is still there if we need it)
- add findglobaltags2() and make findglobaltags() an alias for it
(disabling tag caching is a one-line patch)
- factor out tagcache class with methods readcache() and writecache();
the expensive part of tag finding (iterate over heads and find
.hgtags filenode) is now in tagcache.readcache()
author | Greg Ward <greg-hg@gerg.ca> |
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date | Thu, 16 Jul 2009 10:39:42 -0400 |
parents | abb7d4d43a5f |
children | 4017291c4c48 |
rev | line source |
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1 # tags.py - read tag info from local repository |
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2 # |
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3 # Copyright 2009 Matt Mackall <mpm@selenic.com> |
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4 # Copyright 2009 Greg Ward <greg@gerg.ca> |
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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, incorporated herein by reference. |
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8 |
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9 # Currently this module only deals with reading and caching tags. |
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10 # Eventually, it could take care of updating (adding/removing/moving) |
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11 # tags too. |
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12 |
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13 import os |
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14 from node import nullid, bin, hex, short |
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15 from i18n import _ |
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16 import encoding |
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17 import error |
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18 |
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19 def _debugalways(ui, *msg): |
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20 ui.write(*msg) |
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21 |
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22 def _debugconditional(ui, *msg): |
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23 ui.debug(*msg) |
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24 |
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25 def _debugnever(ui, *msg): |
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26 pass |
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27 |
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28 _debug = _debugalways |
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29 _debug = _debugnever |
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30 |
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31 def findglobaltags1(ui, repo, alltags, tagtypes): |
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32 '''Find global tags in repo by reading .hgtags from every head that |
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33 has a distinct version of it. Updates the dicts alltags, tagtypes |
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34 in place: alltags maps tag name to (node, hist) pair (see _readtags() |
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35 below), and tagtypes maps tag name to tag type ('global' in this |
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36 case).''' |
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37 |
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38 seen = set() |
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39 fctx = None |
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40 ctxs = [] # list of filectx |
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41 for node in repo.heads(): |
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42 try: |
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43 fnode = repo[node].filenode('.hgtags') |
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44 except error.LookupError: |
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45 continue |
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46 if fnode not in seen: |
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47 seen.add(fnode) |
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48 if not fctx: |
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49 fctx = repo.filectx('.hgtags', fileid=fnode) |
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50 else: |
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51 fctx = fctx.filectx(fnode) |
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52 ctxs.append(fctx) |
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53 |
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54 # read the tags file from each head, ending with the tip |
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55 for fctx in reversed(ctxs): |
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56 filetags = _readtags( |
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57 ui, repo, fctx.data().splitlines(), fctx) |
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58 _updatetags(filetags, "global", alltags, tagtypes) |
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59 |
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60 def findglobaltags2(ui, repo, alltags, tagtypes): |
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61 '''Same as findglobaltags1(), but with caching.''' |
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62 (heads, tagfnode, shouldwrite) = _readtagcache(ui, repo) |
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63 |
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64 _debug(ui, "reading tags from %d head(s): %s\n" |
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65 % (len(heads), map(short, reversed(heads)))) |
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66 seen = set() # set of fnode |
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67 fctx = None |
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68 for head in reversed(heads): # oldest to newest |
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69 assert head in repo.changelog.nodemap, \ |
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70 "tag cache returned bogus head %s" % short(head) |
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71 |
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72 fnode = tagfnode.get(head) |
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73 if fnode and fnode not in seen: |
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74 seen.add(fnode) |
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75 if not fctx: |
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76 fctx = repo.filectx('.hgtags', fileid=fnode) |
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77 else: |
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78 fctx = fctx.filectx(fnode) |
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79 |
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80 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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81 _updatetags(filetags, 'global', alltags, tagtypes) |
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82 |
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83 # and update the cache (if necessary) |
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84 if shouldwrite: |
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85 _writetagcache(ui, repo, heads, tagfnode) |
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86 |
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87 # Set this to findglobaltags1 to disable tag caching. |
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88 findglobaltags = findglobaltags2 |
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89 |
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90 def readlocaltags(ui, repo, alltags, tagtypes): |
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91 '''Read local tags in repo. Update alltags and tagtypes.''' |
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92 try: |
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93 data = encoding.fromlocal(repo.opener("localtags").read()) |
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94 # localtags are stored in the local character set |
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95 # while the internal tag table is stored in UTF-8 |
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96 filetags = _readtags( |
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97 ui, repo, data.splitlines(), "localtags") |
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98 _updatetags(filetags, "local", alltags, tagtypes) |
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99 except IOError: |
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100 pass |
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101 |
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102 def _readtags(ui, repo, lines, fn): |
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103 '''Read tag definitions from a file (or any source of lines). |
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104 Return a mapping from tag name to (node, hist): node is the node id |
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105 from the last line read for that name, and hist is the list of node |
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106 ids previously associated with it (in file order). All node ids are |
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107 binary, not hex.''' |
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108 |
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109 filetags = {} # map tag name to (node, hist) |
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110 count = 0 |
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111 |
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112 def warn(msg): |
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113 ui.warn(_("%s, line %s: %s\n") % (fn, count, msg)) |
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114 |
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115 for line in lines: |
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116 count += 1 |
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117 if not line: |
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118 continue |
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119 try: |
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120 (nodehex, name) = line.split(" ", 1) |
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121 except ValueError: |
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122 warn(_("cannot parse entry")) |
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123 continue |
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124 name = encoding.tolocal(name.strip()) # stored in UTF-8 |
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125 try: |
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126 nodebin = bin(nodehex) |
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127 except TypeError: |
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128 warn(_("node '%s' is not well formed") % nodehex) |
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129 continue |
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130 if nodebin not in repo.changelog.nodemap: |
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131 # silently ignore as pull -r might cause this |
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132 continue |
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133 |
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134 # update filetags |
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135 hist = [] |
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136 if name in filetags: |
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137 n, hist = filetags[name] |
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138 hist.append(n) |
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139 filetags[name] = (nodebin, hist) |
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140 return filetags |
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141 |
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142 def _updatetags(filetags, tagtype, alltags, tagtypes): |
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143 '''Incorporate the tag info read from one file into the two |
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144 dictionaries, alltags and tagtypes, that contain all tag |
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145 info (global across all heads plus local).''' |
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146 |
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147 for name, nodehist in filetags.iteritems(): |
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148 if name not in alltags: |
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149 alltags[name] = nodehist |
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150 tagtypes[name] = tagtype |
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151 continue |
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152 |
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153 # we prefer alltags[name] if: |
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154 # it supercedes us OR |
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155 # mutual supercedes and it has a higher rank |
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156 # otherwise we win because we're tip-most |
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157 anode, ahist = nodehist |
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158 bnode, bhist = alltags[name] |
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159 if (bnode != anode and anode in bhist and |
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160 (bnode not in ahist or len(bhist) > len(ahist))): |
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161 anode = bnode |
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162 ahist.extend([n for n in bhist if n not in ahist]) |
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163 alltags[name] = anode, ahist |
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164 tagtypes[name] = tagtype |
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165 |
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166 |
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167 # The tag cache only stores info about heads, not the tag contents |
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168 # from each head. I.e. it doesn't try to squeeze out the maximum |
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169 # performance, but is simpler has a better chance of actually |
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170 # working correctly. And this gives the biggest performance win: it |
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171 # avoids looking up .hgtags in the manifest for every head, and it |
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172 # can avoid calling heads() at all if there have been no changes to |
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173 # the repo. |
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174 |
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175 def _readtagcache(ui, repo): |
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176 '''Read the tag cache and return a tuple (heads, fnodes, |
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177 shouldwrite). heads is the list of all heads currently in the |
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178 repository (ordered from tip to oldest) and fnodes is a mapping from |
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179 head to .hgtags filenode. Caller is responsible for reading tag |
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180 info from each head.''' |
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181 |
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182 try: |
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183 cachefile = repo.opener('tags.cache', 'r') |
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184 _debug(ui, 'reading tag cache from %s\n' % cachefile.name) |
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185 except IOError: |
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186 cachefile = None |
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187 |
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188 # The cache file consists of lines like |
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189 # <headrev> <headnode> [<tagnode>] |
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190 # where <headrev> and <headnode> redundantly identify a repository |
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191 # head from the time the cache was written, and <tagnode> is the |
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192 # filenode of .hgtags on that head. Heads with no .hgtags file will |
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193 # have no <tagnode>. The cache is ordered from tip to oldest (which |
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194 # is part of why <headrev> is there: a quick visual check is all |
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195 # that's required to ensure correct order). |
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196 # |
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197 # This information is enough to let us avoid the most expensive part |
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198 # of finding global tags, which is looking up <tagnode> in the |
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199 # manifest for each head. |
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200 cacherevs = [] # list of headrev |
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201 cacheheads = [] # list of headnode |
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202 cachefnode = {} # map headnode to filenode |
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203 if cachefile: |
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204 for line in cachefile: |
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205 line = line.rstrip().split() |
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206 cacherevs.append(int(line[0])) |
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207 headnode = bin(line[1]) |
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208 cacheheads.append(headnode) |
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209 if len(line) == 3: |
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210 fnode = bin(line[2]) |
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211 cachefnode[headnode] = fnode |
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212 |
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213 cachefile.close() |
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214 |
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215 tipnode = repo.changelog.tip() |
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216 tiprev = len(repo.changelog) - 1 |
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217 |
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218 # Case 1 (common): tip is the same, so nothing has changed. |
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219 # (Unchanged tip trivially means no changesets have been added. |
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220 # But, thanks to localrepository.destroyed(), it also means none |
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221 # have been destroyed by strip or rollback.) |
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222 if cacheheads and cacheheads[0] == tipnode and cacherevs[0] == tiprev: |
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223 _debug(ui, "tag cache: tip unchanged\n") |
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224 return (cacheheads, cachefnode, False) |
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225 |
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226 repoheads = repo.heads() |
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227 |
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228 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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229 # writing an empty cache. |
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230 if repoheads == [nullid]: |
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231 return ([], {}, False) |
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232 |
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233 # Case 3 (uncommon): cache file missing or empty. |
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234 if not cacheheads: |
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235 _debug(ui, 'tag cache: cache file missing or empty\n') |
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236 |
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237 # Case 4 (uncommon): tip rev decreased. This should only happen |
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238 # when we're called from localrepository.destroyed(). Refresh the |
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239 # cache so future invocations will not see disappeared heads in the |
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240 # cache. |
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241 elif cacheheads and tiprev < cacherevs[0]: |
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242 _debug(ui, |
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243 'tag cache: tip rev decremented (from %d to %d), ' |
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244 'so we must be destroying nodes\n' |
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245 % (cacherevs[0], tiprev)) |
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246 |
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247 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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248 else: |
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249 _debug(ui, |
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250 'tag cache: tip has changed (%d:%s); must find new heads\n' |
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251 % (tiprev, short(tipnode))) |
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252 |
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253 # Luckily, the code to handle cases 3, 4, 5 is the same. So the |
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254 # above if/elif/else can disappear once we're confident this thing |
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255 # actually works and we don't need the debug output. |
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256 |
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257 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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258 # exposed". |
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259 newheads = [head |
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260 for head in repoheads |
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261 if head not in set(cacheheads)] |
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262 _debug(ui, 'tag cache: found %d head(s) not in cache: %s\n' |
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263 % (len(newheads), map(short, newheads))) |
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264 |
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265 # Now we have to lookup the .hgtags filenode for every new head. |
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266 # This is the most expensive part of finding tags, so performance |
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267 # depends primarily on the size of newheads. Worst case: no cache |
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268 # file, so newheads == repoheads. |
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269 for head in newheads: |
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270 cctx = repo[head] |
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271 try: |
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272 fnode = cctx.filenode('.hgtags') |
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273 cachefnode[head] = fnode |
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274 except error.LookupError: |
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275 # no .hgtags file on this head |
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276 pass |
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277 |
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278 # Caller has to iterate over all heads, but can use the filenodes in |
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279 # cachefnode to get to each .hgtags revision quickly. |
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280 return (repoheads, cachefnode, True) |
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281 |
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282 def _writetagcache(ui, repo, heads, tagfnode): |
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283 |
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284 cachefile = repo.opener('tags.cache', 'w', atomictemp=True) |
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285 _debug(ui, 'writing cache file %s\n' % cachefile.name) |
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286 |
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287 realheads = repo.heads() # for sanity checks below |
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288 for head in heads: |
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289 # temporary sanity checks; these can probably be removed |
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290 # once this code has been in crew for a few weeks |
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291 assert head in repo.changelog.nodemap, \ |
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292 'trying to write non-existent node %s to tag cache' % short(head) |
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293 assert head in realheads, \ |
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294 'trying to write non-head %s to tag cache' % short(head) |
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295 assert head != nullid, \ |
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296 'trying to write nullid to tag cache' |
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297 |
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298 # This can't fail because of the first assert above. When/if we |
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299 # remove that assert, we might want to catch LookupError here |
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300 # and downgrade it to a warning. |
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301 rev = repo.changelog.rev(head) |
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302 |
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303 fnode = tagfnode.get(head) |
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304 if fnode: |
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305 cachefile.write('%d %s %s\n' % (rev, hex(head), hex(fnode))) |
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306 else: |
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307 cachefile.write('%d %s\n' % (rev, hex(head))) |
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308 |
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309 cachefile.rename() |
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310 cachefile.close() |