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annotate mercurial/revlog.py @ 76:d993ebd69d28

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Add lazy{parser,index,map} to speed up processing of index files
author mpm@selenic.com
date Tue, 17 May 2005 00:33:22 -0800
parents ee1cbe841e01
children bed15e766511
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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
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17 def compress(text):
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18 return zlib.compress(text)
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19
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20 def decompress(bin):
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21 return zlib.decompress(bin)
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22
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23 def hash(text, p1, p2):
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24 l = [p1, p2]
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25 l.sort()
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26 return sha.sha(l[0] + l[1] + text).digest()
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27
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28 nullid = "\0" * 20
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29 indexformat = ">4l20s20s20s"
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30
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31 class lazyparser:
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32 def __init__(self, data):
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33 self.data = data
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34 self.s = struct.calcsize(indexformat)
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35 self.l = len(data)/self.s
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36 self.index = [None] * self.l
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37 self.map = {nullid: -1}
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38
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39 if 0:
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40 n = 0
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41 i = self.data
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42 s = struct.calcsize(indexformat)
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43 for f in xrange(0, len(i), s):
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44 # offset, size, base, linkrev, p1, p2, nodeid
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45 e = struct.unpack(indexformat, i[f:f + s])
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46 self.map[e[6]] = n
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47 self.index.append(e)
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48 n += 1
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49
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50 def load(self, pos):
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51 block = pos / 1000
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52 i = block * 1000
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53 end = min(self.l, i + 1000)
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54 while i < end:
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55 d = self.data[i * self.s: (i + 1) * self.s]
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56 e = struct.unpack(indexformat, d)
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57 self.index[i] = e
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58 self.map[e[6]] = i
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59 i += 1
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60
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61 class lazyindex:
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62 def __init__(self, parser):
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63 self.p = parser
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64 def __len__(self):
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65 return len(self.p.index)
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66 def __getitem__(self, pos):
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67 i = self.p.index[pos]
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68 if not i:
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69 self.p.load(pos)
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70 return self.p.index[pos]
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71 return i
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72 def append(self, e):
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73 self.p.index.append(e)
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74
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75 class lazymap:
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76 def __init__(self, parser):
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77 self.p = parser
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78 def load(self, key):
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79 n = self.p.data.find(key)
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80 if n < 0: raise KeyError(key)
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81 pos = n / self.p.s
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82 self.p.load(pos)
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83 def __contains__(self, key):
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84 try:
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85 self.p.map[key]
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86 return True
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87 except KeyError:
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88 return False
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89 def __getitem__(self, key):
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90 try:
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91 return self.p.map[key]
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92 except KeyError:
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93 self.load(key)
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94 return self.p.map[key]
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95 def __setitem__(self, key, val):
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96 self.p.map[key] = val
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97
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98 class revlog:
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99 def __init__(self, opener, indexfile, datafile):
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100 self.indexfile = indexfile
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101 self.datafile = datafile
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102 self.opener = opener
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103 self.cache = None
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104 # read the whole index for now, handle on-demand later
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105 try:
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106 i = self.opener(self.indexfile).read()
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107 except IOError:
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108 i = ""
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109 parser = lazyparser(i)
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110 self.index = lazyindex(parser)
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111 self.nodemap = lazymap(parser)
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112
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113 def tip(self): return self.node(len(self.index) - 1)
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114 def count(self): return len(self.index)
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115 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6]
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116 def rev(self, node): return self.nodemap[node]
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117 def linkrev(self, node): return self.index[self.nodemap[node]][3]
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118 def parents(self, node):
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119 if node == nullid: return (nullid, nullid)
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120 return self.index[self.nodemap[node]][4:6]
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121
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122 def start(self, rev): return self.index[rev][0]
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123 def length(self, rev): return self.index[rev][1]
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124 def end(self, rev): return self.start(rev) + self.length(rev)
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125 def base(self, rev): return self.index[rev][2]
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126
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127 def lookup(self, id):
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128 try:
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129 rev = int(id)
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130 return self.node(rev)
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131 except ValueError:
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132 c = []
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133 for n in self.nodemap:
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134 if id in hex(n):
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135 c.append(n)
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136 if len(c) > 1: raise KeyError("Ambiguous identifier")
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137 if len(c) < 1: raise KeyError("No match found")
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138 return c[0]
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139
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140 return None
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141
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142 def revisions(self, list):
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143 # this can be optimized to do spans, etc
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144 # be stupid for now
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145 for node in list:
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146 yield self.revision(node)
0
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147
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148 def diff(self, a, b):
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149 return mdiff.textdiff(a, b)
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150
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151 def patches(self, t, pl):
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152 return mdiff.patches(t, pl)
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153
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154 def revision(self, node):
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155 if node == nullid: return ""
0
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156 if self.cache and self.cache[0] == node: return self.cache[2]
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157
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158 text = None
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159 rev = self.rev(node)
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160 base = self.base(rev)
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161 start = self.start(base)
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162 end = self.end(rev)
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163
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164 if self.cache and self.cache[1] >= base and self.cache[1] < rev:
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165 base = self.cache[1]
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166 start = self.start(base + 1)
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167 text = self.cache[2]
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168 last = 0
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169
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170 f = self.opener(self.datafile)
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171 f.seek(start)
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172 data = f.read(end - start)
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173
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174 if not text:
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175 last = self.length(base)
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176 text = decompress(data[:last])
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177
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178 bins = []
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179 for r in xrange(base + 1, rev + 1):
0
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180 s = self.length(r)
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181 bins.append(decompress(data[last:last + s]))
0
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182 last = last + s
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183
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184 text = mdiff.patches(text, bins)
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185
0
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186 (p1, p2) = self.parents(node)
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187 if node != hash(text, p1, p2):
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188 raise "integrity check failed on %s:%d" % (self.datafile, rev)
0
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189
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190 self.cache = (node, rev, text)
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191 return text
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192
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193 def addrevision(self, text, transaction, link, p1=None, p2=None):
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194 if text is None: text = ""
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195 if p1 is None: p1 = self.tip()
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196 if p2 is None: p2 = nullid
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197
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198 node = hash(text, p1, p2)
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199
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200 n = self.count()
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201 t = n - 1
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202
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203 if n:
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204 base = self.base(t)
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205 start = self.start(base)
0
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206 end = self.end(t)
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207 prev = self.revision(self.tip())
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208 data = compress(self.diff(prev, text))
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209 dist = end - start + len(data)
0
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210
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211 # full versions are inserted when the needed deltas
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212 # become comparable to the uncompressed text
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213 if not n or dist > len(text) * 2:
0
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214 data = compress(text)
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215 base = n
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216 else:
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217 base = self.base(t)
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218
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219 offset = 0
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220 if t >= 0:
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221 offset = self.end(t)
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222
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223 e = (offset, len(data), base, link, p1, p2, node)
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224
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225 self.index.append(e)
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226 self.nodemap[node] = n
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227 entry = struct.pack(indexformat, *e)
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228
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229 transaction.add(self.datafile, e[0])
0
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230 self.opener(self.datafile, "a").write(data)
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231 transaction.add(self.indexfile, n * len(entry))
0
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232 self.opener(self.indexfile, "a").write(entry)
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233
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234 self.cache = (node, n, text)
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235 return node
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236
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237 def ancestor(self, a, b):
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238 def expand(list, map):
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239 a = []
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240 while list:
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241 n = list.pop(0)
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242 map[n] = 1
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243 yield n
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244 for p in self.parents(n):
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245 if p != nullid and p not in map:
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246 list.append(p)
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247 yield nullid
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248
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249 amap = {}
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250 bmap = {}
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251 ag = expand([a], amap)
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252 bg = expand([b], bmap)
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253 adone = bdone = 0
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254
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255 while not adone or not bdone:
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256 if not adone:
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257 an = ag.next()
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258 if an == nullid:
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259 adone = 1
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260 elif an in bmap:
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261 return an
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262 if not bdone:
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263 bn = bg.next()
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264 if bn == nullid:
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265 bdone = 1
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266 elif bn in amap:
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267 return bn
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268
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269 return nullid
0
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270
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271 def mergedag(self, other, transaction, linkseq, accumulate = None):
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272 """combine the nodes from other's DAG into ours"""
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273 old = self.tip()
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274 i = self.count()
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275 l = []
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276
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277 # merge the other revision log into our DAG
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278 for r in range(other.count()):
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279 id = other.node(r)
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280 if id not in self.nodemap:
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281 (xn, yn) = other.parents(id)
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282 l.append((id, xn, yn))
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283 self.nodemap[id] = i
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284 i += 1
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285
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286 # merge node date for new nodes
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287 r = other.revisions([e[0] for e in l])
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288 for e in l:
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289 t = r.next()
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290 if accumulate: accumulate(t)
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291 self.addrevision(t, transaction, linkseq.next(), e[1], e[2])
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292
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293 # return the unmerged heads for later resolving
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294 return (old, self.tip())
46
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295
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296 def group(self, linkmap):
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297 # given a list of changeset revs, return a set of deltas and
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298 # metadata corresponding to nodes the first delta is
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299 # parent(nodes[0]) -> nodes[0] the receiver is guaranteed to
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300 # have this parent as it has all history before these
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301 # changesets. parent is parent[0]
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302
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303 revs = []
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304 needed = {}
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305
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306 # find file nodes/revs that match changeset revs
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307 for i in xrange(0, self.count()):
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308 if self.index[i][3] in linkmap:
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309 revs.append(i)
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310 needed[i] = 1
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311
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312 # if we don't have any revisions touched by these changesets, bail
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313 if not revs: return struct.pack(">l", 0)
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314
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315 # add the parent of the first rev
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316 p = self.parents(self.node(revs[0]))[0]
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317 revs.insert(0, self.rev(p))
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318
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319 # for each delta that isn't contiguous in the log, we need to
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320 # reconstruct the base, reconstruct the result, and then
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321 # calculate the delta. We also need to do this where we've
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322 # stored a full version and not a delta
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323 for i in xrange(0, len(revs) - 1):
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324 a, b = revs[i], revs[i + 1]
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325 if a + 1 != b or self.base(b) == b:
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326 for j in xrange(self.base(a), a + 1):
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327 needed[j] = 1
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328 for j in xrange(self.base(b), b + 1):
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329 needed[j] = 1
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330
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331 # calculate spans to retrieve from datafile
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332 needed = needed.keys()
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333 needed.sort()
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334 spans = []
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335 for n in needed:
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336 if n < 0: continue
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337 o = self.start(n)
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338 l = self.length(n)
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339 spans.append((o, l, [(n, l)]))
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340
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341 # merge spans
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342 merge = [spans.pop(0)]
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343 while spans:
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344 e = spans.pop(0)
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345 f = merge[-1]
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346 if e[0] == f[0] + f[1]:
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347 merge[-1] = (f[0], f[1] + e[1], f[2] + e[2])
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348 else:
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349 merge.append(e)
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350
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351 # read spans in, divide up chunks
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352 chunks = {}
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353 for span in merge:
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354 # we reopen the file for each span to make http happy for now
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355 f = self.opener(self.datafile)
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356 f.seek(span[0])
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357 data = f.read(span[1])
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358
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359 # divide up the span
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360 pos = 0
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361 for r, l in span[2]:
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362 chunks[r] = data[pos: pos + l]
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363 pos += l
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364
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365 # helper to reconstruct intermediate versions
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366 def construct(text, base, rev):
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367 bins = [decompress(chunks[r]) for r in xrange(base + 1, rev + 1)]
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368 return mdiff.patches(text, bins)
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369
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370 # build deltas
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371 deltas = []
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372 for d in xrange(0, len(revs) - 1):
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373 a, b = revs[d], revs[d + 1]
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374 n = self.node(b)
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375
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376 if a + 1 != b or self.base(b) == b:
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377 if a >= 0:
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378 base = self.base(a)
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379 ta = decompress(chunks[self.base(a)])
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380 ta = construct(ta, base, a)
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381 else:
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382 ta = ""
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383
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384 base = self.base(b)
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385 if a > base:
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386 base = a
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387 tb = ta
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388 else:
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389 tb = decompress(chunks[self.base(b)])
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390 tb = construct(tb, base, b)
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391 d = self.diff(ta, tb)
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392 else:
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393 d = decompress(chunks[b])
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394
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395 p = self.parents(n)
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396 meta = n + p[0] + p[1] + linkmap[self.linkrev(n)]
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397 l = struct.pack(">l", len(meta) + len(d) + 4)
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398 deltas.append(l + meta + d)
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399
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400 l = struct.pack(">l", sum(map(len, deltas)) + 4)
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401 deltas.insert(0, l)
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402 return "".join(deltas)
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403
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404 def addgroup(self, data, linkmapper, transaction):
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405 # given a set of deltas, add them to the revision log. the
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406 # first delta is against its parent, which should be in our
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407 # log, the rest are against the previous delta.
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408
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409 if not data: return self.tip()
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410
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411 # retrieve the parent revision of the delta chain
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412 chain = data[24:44]
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413
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414 # track the base of the current delta log
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415 r = self.count()
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416 t = r - 1
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417
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418 base = prev = -1
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419 start = end = 0
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420 if r:
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421 start = self.start(self.base(t))
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422 end = self.end(t)
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423 measure = self.length(self.base(t))
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424 base = self.base(t)
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425 prev = self.tip()
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426
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427 transaction.add(self.datafile, end)
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428 transaction.add(self.indexfile, r * struct.calcsize(indexformat))
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429 dfh = self.opener(self.datafile, "a")
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430 ifh = self.opener(self.indexfile, "a")
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431
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432 # loop through our set of deltas
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433 pos = 0
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434 while pos < len(data):
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435 l, node, p1, p2, cs = struct.unpack(">l20s20s20s20s",
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436 data[pos:pos+84])
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437 link = linkmapper(cs)
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438 delta = data[pos + 84:pos + l]
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439 pos += l
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440
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441 # full versions are inserted when the needed deltas become
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442 # comparable to the uncompressed text or when the previous
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443 # version is not the one we have a delta against. We use
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444 # the size of the previous full rev as a proxy for the
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445 # current size.
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446
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447 if chain == prev:
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448 cdelta = compress(delta)
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449
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450 if chain != prev or (end - start + len(cdelta)) > measure * 2:
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451 # flush our writes here so we can read it in revision
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452 dfh.flush()
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453 ifh.flush()
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454 text = self.revision(chain)
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455 text = self.patches(text, [delta])
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456 chk = self.addrevision(text, transaction, link, p1, p2)
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457 if chk != node:
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458 raise "consistency error adding group"
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459 measure = len(text)
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460 else:
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461 e = (end, len(cdelta), self.base(t), link, p1, p2, node)
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462 self.index.append(e)
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463 self.nodemap[node] = r
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464 dfh.write(cdelta)
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diff changeset
465 ifh.write(struct.pack(indexformat, *e))
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466
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d40cc5aacc31 Fix up a bunch of bugs in the new merge code
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467 t, r, chain, prev = r, r + 1, node, node
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468 start = self.start(self.base(t))
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469 end = self.end(t)
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diff changeset
470
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471 dfh.close()
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472 ifh.close()
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473 return node