Mercurial > hg > gitweb

annotate mercurial/revlog.py @ 98:3dde7c87e36d

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add paranoia to diff code
author mpm@selenic.com
date Wed, 18 May 2005 16:59:54 -0800
parents 7a2abee6b0c2
children aea6562add6c
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rev   line source
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1 # revlog.py - storage back-end for mercurial
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2 #
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3 # This provides efficient delta storage with O(1) retrieve and append
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4 # and O(changes) merge between branches
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5 #
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6 # Copyright 2005 Matt Mackall <mpm@selenic.com>
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7 #
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8 # This software may be used and distributed according to the terms
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9 # of the GNU General Public License, incorporated herein by reference.
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10
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11 import zlib, struct, sha, os, tempfile, binascii
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12 from mercurial import mdiff
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13
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14 def hex(node): return binascii.hexlify(node)
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15 def bin(node): return binascii.unhexlify(node)
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16 def short(node): return hex(node[:4])
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17
0
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18 def compress(text):
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19 return zlib.compress(text)
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20
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21 def decompress(bin):
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22 return zlib.decompress(bin)
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23
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24 def hash(text, p1, p2):
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25 l = [p1, p2]
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26 l.sort()
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27 return sha.sha(l[0] + l[1] + text).digest()
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28
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29 nullid = "\0" * 20
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30 indexformat = ">4l20s20s20s"
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31
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32 class lazyparser:
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33 def __init__(self, data):
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34 self.data = data
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35 self.s = struct.calcsize(indexformat)
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36 self.l = len(data)/self.s
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37 self.index = [None] * self.l
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38 self.map = {nullid: -1}
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39
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40 if 0:
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41 n = 0
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42 i = self.data
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43 s = struct.calcsize(indexformat)
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44 for f in xrange(0, len(i), s):
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45 # offset, size, base, linkrev, p1, p2, nodeid
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46 e = struct.unpack(indexformat, i[f:f + s])
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47 self.map[e[6]] = n
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48 self.index.append(e)
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49 n += 1
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50
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51 def load(self, pos):
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52 block = pos / 1000
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53 i = block * 1000
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54 end = min(self.l, i + 1000)
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55 while i < end:
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56 d = self.data[i * self.s: (i + 1) * self.s]
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57 e = struct.unpack(indexformat, d)
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58 self.index[i] = e
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59 self.map[e[6]] = i
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60 i += 1
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61
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62 class lazyindex:
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63 def __init__(self, parser):
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64 self.p = parser
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65 def __len__(self):
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66 return len(self.p.index)
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67 def __getitem__(self, pos):
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68 i = self.p.index[pos]
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69 if not i:
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70 self.p.load(pos)
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71 return self.p.index[pos]
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72 return i
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73 def append(self, e):
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74 self.p.index.append(e)
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75
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76 class lazymap:
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77 def __init__(self, parser):
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78 self.p = parser
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79 def load(self, key):
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80 n = self.p.data.find(key)
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81 if n < 0: raise KeyError("node " + hex(key))
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82 pos = n / self.p.s
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83 self.p.load(pos)
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84 def __contains__(self, key):
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85 try:
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86 self[key]
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87 return True
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88 except KeyError:
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89 return False
97
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90 def __iter__(self):
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91 for i in xrange(self.p.l):
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92 try:
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93 yield self.p.index[i][6]
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94 except:
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95 self.p.load(i)
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96 yield self.p.index[i][6]
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97 def __getitem__(self, key):
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98 try:
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99 return self.p.map[key]
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100 except KeyError:
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101 try:
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102 self.load(key)
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103 return self.p.map[key]
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104 except KeyError:
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105 raise KeyError("node " + hex(key))
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106 def __setitem__(self, key, val):
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107 self.p.map[key] = val
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108
0
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109 class revlog:
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110 def __init__(self, opener, indexfile, datafile):
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111 self.indexfile = indexfile
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112 self.datafile = datafile
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113 self.opener = opener
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114 self.cache = None
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115 # read the whole index for now, handle on-demand later
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116 try:
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117 i = self.opener(self.indexfile).read()
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118 except IOError:
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119 i = ""
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120 parser = lazyparser(i)
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121 self.index = lazyindex(parser)
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122 self.nodemap = lazymap(parser)
0
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123
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124 def tip(self): return self.node(len(self.index) - 1)
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125 def count(self): return len(self.index)
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126 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6]
0
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127 def rev(self, node): return self.nodemap[node]
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128 def linkrev(self, node): return self.index[self.nodemap[node]][3]
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129 def parents(self, node):
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130 if node == nullid: return (nullid, nullid)
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131 return self.index[self.nodemap[node]][4:6]
0
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132
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133 def start(self, rev): return self.index[rev][0]
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134 def length(self, rev): return self.index[rev][1]
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135 def end(self, rev): return self.start(rev) + self.length(rev)
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136 def base(self, rev): return self.index[rev][2]
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137
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138 def lookup(self, id):
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139 try:
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140 rev = int(id)
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141 return self.node(rev)
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142 except ValueError:
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143 c = []
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144 for n in self.nodemap:
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145 if id in hex(n):
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146 c.append(n)
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147 if len(c) > 1: raise KeyError("Ambiguous identifier")
67
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148 if len(c) < 1: raise KeyError("No match found")
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149 return c[0]
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150
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151 return None
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152
0
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153 def diff(self, a, b):
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154 return mdiff.textdiff(a, b)
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155
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156 def patches(self, t, pl):
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157 return mdiff.patches(t, pl)
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158
0
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159 def revision(self, node):
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160 if node == nullid: return ""
0
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161 if self.cache and self.cache[0] == node: return self.cache[2]
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162
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163 text = None
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164 rev = self.rev(node)
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165 base = self.base(rev)
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166 start = self.start(base)
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167 end = self.end(rev)
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168
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169 if self.cache and self.cache[1] >= base and self.cache[1] < rev:
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170 base = self.cache[1]
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171 start = self.start(base + 1)
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172 text = self.cache[2]
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173 last = 0
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174
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175 f = self.opener(self.datafile)
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176 f.seek(start)
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177 data = f.read(end - start)
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178
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179 if not text:
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180 last = self.length(base)
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181 text = decompress(data[:last])
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182
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183 bins = []
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184 for r in xrange(base + 1, rev + 1):
0
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185 s = self.length(r)
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186 bins.append(decompress(data[last:last + s]))
0
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187 last = last + s
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188
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189 text = mdiff.patches(text, bins)
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190
0
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191 (p1, p2) = self.parents(node)
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192 if node != hash(text, p1, p2):
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193 raise IOError("integrity check failed on %s:%d"
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194 % (self.datafile, rev))
0
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195
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196 self.cache = (node, rev, text)
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197 return text
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198
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199 def addrevision(self, text, transaction, link, p1=None, p2=None):
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200 if text is None: text = ""
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201 if p1 is None: p1 = self.tip()
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202 if p2 is None: p2 = nullid
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203
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204 node = hash(text, p1, p2)
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205
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206 n = self.count()
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207 t = n - 1
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208
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209 if n:
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210 base = self.base(t)
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211 start = self.start(base)
0
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212 end = self.end(t)
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213 prev = self.revision(self.tip())
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214 d = self.diff(prev, text)
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215 if self.patches(prev, [d]) != text:
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216 raise AssertionError("diff failed")
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217 data = compress(d)
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218 dist = end - start + len(data)
0
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219
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220 # full versions are inserted when the needed deltas
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221 # become comparable to the uncompressed text
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222 if not n or dist > len(text) * 2:
0
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223 data = compress(text)
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224 base = n
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225 else:
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226 base = self.base(t)
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227
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228 offset = 0
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229 if t >= 0:
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230 offset = self.end(t)
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231
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232 e = (offset, len(data), base, link, p1, p2, node)
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233
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234 self.index.append(e)
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235 self.nodemap[node] = n
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236 entry = struct.pack(indexformat, *e)
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237
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238 transaction.add(self.datafile, e[0])
0
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239 self.opener(self.datafile, "a").write(data)
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240 transaction.add(self.indexfile, n * len(entry))
0
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241 self.opener(self.indexfile, "a").write(entry)
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242
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243 self.cache = (node, n, text)
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244 return node
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245
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246 def ancestor(self, a, b):
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247 def expand(list, map):
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248 a = []
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249 while list:
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250 n = list.pop(0)
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251 map[n] = 1
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252 yield n
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253 for p in self.parents(n):
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254 if p != nullid and p not in map:
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255 list.append(p)
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256 yield nullid
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257
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258 amap = {}
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259 bmap = {}
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260 ag = expand([a], amap)
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261 bg = expand([b], bmap)
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262 adone = bdone = 0
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263
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264 while not adone or not bdone:
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265 if not adone:
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266 an = ag.next()
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267 if an == nullid:
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268 adone = 1
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269 elif an in bmap:
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270 return an
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271 if not bdone:
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272 bn = bg.next()
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273 if bn == nullid:
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274 bdone = 1
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275 elif bn in amap:
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276 return bn
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277
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278 return nullid
0
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279
46
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280 def group(self, linkmap):
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281 # given a list of changeset revs, return a set of deltas and
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282 # metadata corresponding to nodes. the first delta is
46
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283 # parent(nodes[0]) -> nodes[0] the receiver is guaranteed to
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284 # have this parent as it has all history before these
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285 # changesets. parent is parent[0]
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286
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287 revs = []
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288 needed = {}
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289
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290 # find file nodes/revs that match changeset revs
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291 for i in xrange(0, self.count()):
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292 if self.index[i][3] in linkmap:
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293 revs.append(i)
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294 needed[i] = 1
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295
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296 # if we don't have any revisions touched by these changesets, bail
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297 if not revs: return struct.pack(">l", 0)
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298
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299 # add the parent of the first rev
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300 p = self.parents(self.node(revs[0]))[0]
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301 revs.insert(0, self.rev(p))
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302
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303 # for each delta that isn't contiguous in the log, we need to
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304 # reconstruct the base, reconstruct the result, and then
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305 # calculate the delta. We also need to do this where we've
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306 # stored a full version and not a delta
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307 for i in xrange(0, len(revs) - 1):
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308 a, b = revs[i], revs[i + 1]
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diff changeset
309 if a + 1 != b or self.base(b) == b:
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310 for j in xrange(self.base(a), a + 1):
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311 needed[j] = 1
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312 for j in xrange(self.base(b), b + 1):
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313 needed[j] = 1
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314
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315 # calculate spans to retrieve from datafile
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316 needed = needed.keys()
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317 needed.sort()
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318 spans = []
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319 for n in needed:
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320 if n < 0: continue
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321 o = self.start(n)
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322 l = self.length(n)
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323 spans.append((o, l, [(n, l)]))
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324
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325 # merge spans
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326 merge = [spans.pop(0)]
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327 while spans:
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328 e = spans.pop(0)
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329 f = merge[-1]
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330 if e[0] == f[0] + f[1]:
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331 merge[-1] = (f[0], f[1] + e[1], f[2] + e[2])
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332 else:
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333 merge.append(e)
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334
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335 # read spans in, divide up chunks
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336 chunks = {}
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337 for span in merge:
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338 # we reopen the file for each span to make http happy for now
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339 f = self.opener(self.datafile)
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340 f.seek(span[0])
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341 data = f.read(span[1])
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342
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343 # divide up the span
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344 pos = 0
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345 for r, l in span[2]:
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346 chunks[r] = data[pos: pos + l]
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347 pos += l
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348
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349 # helper to reconstruct intermediate versions
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350 def construct(text, base, rev):
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351 bins = [decompress(chunks[r]) for r in xrange(base + 1, rev + 1)]
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352 return mdiff.patches(text, bins)
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353
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354 # build deltas
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355 deltas = []
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356 for d in xrange(0, len(revs) - 1):
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357 a, b = revs[d], revs[d + 1]
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358 n = self.node(b)
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359
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360 if a + 1 != b or self.base(b) == b:
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361 if a >= 0:
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362 base = self.base(a)
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363 ta = decompress(chunks[self.base(a)])
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364 ta = construct(ta, base, a)
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365 else:
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366 ta = ""
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367
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368 base = self.base(b)
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369 if a > base:
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370 base = a
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371 tb = ta
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372 else:
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373 tb = decompress(chunks[self.base(b)])
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374 tb = construct(tb, base, b)
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375 d = self.diff(ta, tb)
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376 else:
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377 d = decompress(chunks[b])
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378
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379 p = self.parents(n)
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380 meta = n + p[0] + p[1] + linkmap[self.linkrev(n)]
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381 l = struct.pack(">l", len(meta) + len(d) + 4)
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382 deltas.append(l + meta + d)
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383
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384 l = struct.pack(">l", sum(map(len, deltas)) + 4)
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385 deltas.insert(0, l)
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386 return "".join(deltas)
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387
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388 def addgroup(self, data, linkmapper, transaction):
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389 # given a set of deltas, add them to the revision log. the
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390 # first delta is against its parent, which should be in our
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391 # log, the rest are against the previous delta.
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392
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393 if not data: return self.tip()
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394
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395 # retrieve the parent revision of the delta chain
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396 chain = data[24:44]
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b2e3528115da More useful message on broken addgroup chain
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397 if not chain in self.nodemap:
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398 raise "unknown base %s" % short(chain[:4])
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399
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400 # track the base of the current delta log
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401 r = self.count()
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402 t = r - 1
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403
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404 base = prev = -1
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405 start = end = 0
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406 if r:
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407 start = self.start(self.base(t))
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408 end = self.end(t)
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409 measure = self.length(self.base(t))
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410 base = self.base(t)
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411 prev = self.tip()
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412
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413 transaction.add(self.datafile, end)
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414 transaction.add(self.indexfile, r * struct.calcsize(indexformat))
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415 dfh = self.opener(self.datafile, "a")
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416 ifh = self.opener(self.indexfile, "a")
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417
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418 # loop through our set of deltas
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419 pos = 0
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420 while pos < len(data):
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421 l, node, p1, p2, cs = struct.unpack(">l20s20s20s20s",
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422 data[pos:pos+84])
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423 link = linkmapper(cs)
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424 if node in self.nodemap:
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425 raise "already have %s" % hex(node[:4])
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426 delta = data[pos + 84:pos + l]
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427 pos += l
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428
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429 # full versions are inserted when the needed deltas become
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430 # comparable to the uncompressed text or when the previous
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431 # version is not the one we have a delta against. We use
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432 # the size of the previous full rev as a proxy for the
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433 # current size.
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434
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435 if chain == prev:
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436 cdelta = compress(delta)
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437
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438 if chain != prev or (end - start + len(cdelta)) > measure * 2:
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439 # flush our writes here so we can read it in revision
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440 dfh.flush()
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441 ifh.flush()
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442 text = self.revision(chain)
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443 text = self.patches(text, [delta])
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444 chk = self.addrevision(text, transaction, link, p1, p2)
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445 if chk != node:
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446 raise "consistency error adding group"
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447 measure = len(text)
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448 else:
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449 e = (end, len(cdelta), self.base(t), link, p1, p2, node)
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450 self.index.append(e)
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451 self.nodemap[node] = r
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452 dfh.write(cdelta)
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453 ifh.write(struct.pack(indexformat, *e))
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454
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455 t, r, chain, prev = r, r + 1, node, node
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456 start = self.start(self.base(t))
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457 end = self.end(t)
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458
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diff changeset
459 dfh.close()
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diff changeset
460 ifh.close()
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461 return node