Mercurial > public > mercurial-scm > hg-stable
annotate mercurial/revlog.py @ 241:afe895fcc0d0
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| author | mpm@selenic.com |
|---|---|
| date | Fri, 03 Jun 2005 18:29:46 -0800 |
| parents | ccbcc4d76f81 4f802588cdfb |
| children | 9a9ea2d1d3c4 |
| 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 |
| 208 | 11 import zlib, struct, sha, binascii, heapq |
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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) |
| 83 | 16 def short(node): return hex(node[:4]) |
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17 |
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18 def compress(text): |
| 112 | 19 if not text: return text |
| 20 if len(text) < 44: | |
| 21 if text[0] == '\0': return text | |
| 22 return 'u' + text | |
| 23 bin = zlib.compress(text) | |
| 24 if len(bin) > len(text): | |
| 25 if text[0] == '\0': return text | |
| 26 return 'u' + text | |
| 27 return bin | |
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28 |
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29 def decompress(bin): |
| 112 | 30 if not bin: return bin |
| 31 t = bin[0] | |
| 32 if t == '\0': return bin | |
| 33 if t == 'x': return zlib.decompress(bin) | |
| 34 if t == 'u': return bin[1:] | |
| 35 raise "unknown compression type %s" % t | |
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36 |
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37 def hash(text, p1, p2): |
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38 l = [p1, p2] |
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39 l.sort() |
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40 return sha.sha(l[0] + l[1] + text).digest() |
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41 |
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42 nullid = "\0" * 20 |
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43 indexformat = ">4l20s20s20s" |
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44 |
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45 class lazyparser: |
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46 def __init__(self, data): |
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47 self.data = data |
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48 self.s = struct.calcsize(indexformat) |
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49 self.l = len(data)/self.s |
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50 self.index = [None] * self.l |
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51 self.map = {nullid: -1} |
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52 |
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53 def load(self, pos): |
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54 block = pos / 1000 |
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55 i = block * 1000 |
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56 end = min(self.l, i + 1000) |
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57 while i < end: |
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58 d = self.data[i * self.s: (i + 1) * self.s] |
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59 e = struct.unpack(indexformat, d) |
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60 self.index[i] = e |
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61 self.map[e[6]] = i |
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62 i += 1 |
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63 |
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64 class lazyindex: |
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65 def __init__(self, parser): |
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66 self.p = parser |
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67 def __len__(self): |
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68 return len(self.p.index) |
| 115 | 69 def load(self, pos): |
| 70 self.p.load(pos) | |
| 71 return self.p.index[pos] | |
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72 def __getitem__(self, pos): |
| 115 | 73 return self.p.index[pos] or self.load(pos) |
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74 def append(self, e): |
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75 self.p.index.append(e) |
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76 |
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77 class lazymap: |
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78 def __init__(self, parser): |
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79 self.p = parser |
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80 def load(self, key): |
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81 n = self.p.data.find(key) |
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82 if n < 0: raise KeyError("node " + hex(key)) |
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83 pos = n / self.p.s |
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84 self.p.load(pos) |
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85 def __contains__(self, key): |
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86 try: |
| 77 | 87 self[key] |
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88 return True |
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89 except KeyError: |
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90 return False |
| 97 | 91 def __iter__(self): |
| 92 for i in xrange(self.p.l): | |
| 93 try: | |
| 94 yield self.p.index[i][6] | |
| 95 except: | |
| 96 self.p.load(i) | |
| 97 yield self.p.index[i][6] | |
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98 def __getitem__(self, key): |
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99 try: |
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100 return self.p.map[key] |
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101 except KeyError: |
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102 try: |
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103 self.load(key) |
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104 return self.p.map[key] |
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105 except KeyError: |
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106 raise KeyError("node " + hex(key)) |
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107 def __setitem__(self, key, val): |
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108 self.p.map[key] = val |
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109 |
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110 class revlog: |
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111 def __init__(self, opener, indexfile, datafile): |
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112 self.indexfile = indexfile |
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113 self.datafile = datafile |
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114 self.opener = opener |
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115 self.cache = None |
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116 |
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117 try: |
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118 i = self.opener(self.indexfile).read() |
| 73 | 119 except IOError: |
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120 i = "" |
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121 |
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122 if len(i) > 10000: |
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123 # big index, let's parse it on demand |
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124 parser = lazyparser(i) |
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125 self.index = lazyindex(parser) |
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126 self.nodemap = lazymap(parser) |
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127 else: |
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128 s = struct.calcsize(indexformat) |
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129 l = len(i) / s |
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130 self.index = [None] * l |
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131 m = [None] * l |
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132 |
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133 n = 0 |
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134 for f in xrange(0, len(i), s): |
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135 # offset, size, base, linkrev, p1, p2, nodeid |
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136 e = struct.unpack(indexformat, i[f:f + s]) |
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137 m[n] = (e[6], n) |
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138 self.index[n] = e |
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139 n += 1 |
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140 |
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141 self.nodemap = dict(m) |
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142 self.nodemap[nullid] = -1 |
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143 |
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144 |
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145 def tip(self): return self.node(len(self.index) - 1) |
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146 def count(self): return len(self.index) |
| 26 | 147 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] |
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148 def rev(self, node): return self.nodemap[node] |
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149 def linkrev(self, node): return self.index[self.nodemap[node]][3] |
| 2 | 150 def parents(self, node): |
| 151 if node == nullid: return (nullid, nullid) | |
| 152 return self.index[self.nodemap[node]][4:6] | |
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153 |
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154 def start(self, rev): return self.index[rev][0] |
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155 def length(self, rev): return self.index[rev][1] |
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156 def end(self, rev): return self.start(rev) + self.length(rev) |
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157 def base(self, rev): return self.index[rev][2] |
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158 |
| 221 | 159 def heads(self): |
| 160 p = {} | |
| 161 h = [] | |
| 162 for r in range(self.count() - 1, 0, -1): | |
| 163 n = self.node(r) | |
| 164 if n not in p: | |
| 165 h.append(n) | |
| 166 for pn in self.parents(n): | |
| 167 p[pn] = 1 | |
| 168 return h | |
| 169 | |
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170 def lookup(self, id): |
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171 try: |
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172 rev = int(id) |
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173 return self.node(rev) |
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174 except ValueError: |
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175 c = [] |
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176 for n in self.nodemap: |
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177 if id in hex(n): |
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178 c.append(n) |
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179 if len(c) > 1: raise KeyError("Ambiguous identifier") |
| 67 | 180 if len(c) < 1: raise KeyError("No match found") |
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181 return c[0] |
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182 |
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183 return None |
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184 |
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185 def diff(self, a, b): |
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186 return mdiff.textdiff(a, b) |
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187 |
| 73 | 188 def patches(self, t, pl): |
| 189 return mdiff.patches(t, pl) | |
| 190 | |
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191 def delta(self, node): |
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192 r = self.rev(node) |
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193 b = self.base(r) |
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194 if r == b: |
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195 return self.diff(self.revision(self.node(r - 1)), |
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196 self.revision(node)) |
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197 else: |
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198 f = self.opener(self.datafile) |
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199 f.seek(self.start(r)) |
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200 data = f.read(self.length(r)) |
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201 return decompress(data) |
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202 |
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203 def revision(self, node): |
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204 if node == nullid: return "" |
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205 if self.cache and self.cache[0] == node: return self.cache[2] |
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206 |
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207 text = None |
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208 rev = self.rev(node) |
| 117 | 209 start, length, base, link, p1, p2, node = self.index[rev] |
| 210 end = start + length | |
| 211 if base != rev: start = self.start(base) | |
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212 |
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213 if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
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214 base = self.cache[1] |
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215 start = self.start(base + 1) |
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216 text = self.cache[2] |
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217 last = 0 |
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218 |
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219 f = self.opener(self.datafile) |
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220 f.seek(start) |
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221 data = f.read(end - start) |
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222 |
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223 if not text: |
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224 last = self.length(base) |
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225 text = decompress(data[:last]) |
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226 |
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227 bins = [] |
| 64 | 228 for r in xrange(base + 1, rev + 1): |
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229 s = self.length(r) |
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230 bins.append(decompress(data[last:last + s])) |
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231 last = last + s |
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232 |
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233 text = mdiff.patches(text, bins) |
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234 |
| 26 | 235 if node != hash(text, p1, p2): |
| 98 | 236 raise IOError("integrity check failed on %s:%d" |
| 237 % (self.datafile, rev)) | |
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238 |
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239 self.cache = (node, rev, text) |
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240 return text |
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241 |
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242 def addrevision(self, text, transaction, link, p1=None, p2=None): |
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243 if text is None: text = "" |
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244 if p1 is None: p1 = self.tip() |
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245 if p2 is None: p2 = nullid |
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246 |
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247 node = hash(text, p1, p2) |
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248 |
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249 n = self.count() |
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250 t = n - 1 |
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251 |
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252 if n: |
| 64 | 253 base = self.base(t) |
| 254 start = self.start(base) | |
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255 end = self.end(t) |
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256 prev = self.revision(self.tip()) |
| 98 | 257 d = self.diff(prev, text) |
| 258 data = compress(d) | |
| 64 | 259 dist = end - start + len(data) |
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260 |
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261 # full versions are inserted when the needed deltas |
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262 # become comparable to the uncompressed text |
| 64 | 263 if not n or dist > len(text) * 2: |
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264 data = compress(text) |
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265 base = n |
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266 else: |
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267 base = self.base(t) |
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268 |
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269 offset = 0 |
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270 if t >= 0: |
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271 offset = self.end(t) |
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272 |
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273 e = (offset, len(data), base, link, p1, p2, node) |
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274 |
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275 self.index.append(e) |
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276 self.nodemap[node] = n |
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277 entry = struct.pack(indexformat, *e) |
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278 |
| 26 | 279 transaction.add(self.datafile, e[0]) |
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280 self.opener(self.datafile, "a").write(data) |
| 41 | 281 transaction.add(self.indexfile, n * len(entry)) |
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282 self.opener(self.indexfile, "a").write(entry) |
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283 |
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284 self.cache = (node, n, text) |
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285 return node |
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286 |
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287 def ancestor(self, a, b): |
| 147 | 288 # calculate the distance of every node from root |
| 289 dist = {nullid: 0} | |
| 290 for i in xrange(self.count()): | |
| 291 n = self.node(i) | |
| 292 p1, p2 = self.parents(n) | |
| 293 dist[n] = max(dist[p1], dist[p2]) + 1 | |
| 294 | |
| 295 # traverse ancestors in order of decreasing distance from root | |
| 296 def ancestors(node): | |
| 297 # we store negative distances because heap returns smallest member | |
| 298 h = [(-dist[node], node)] | |
| 299 seen = {} | |
| 300 earliest = self.count() | |
| 301 while h: | |
| 302 d, n = heapq.heappop(h) | |
| 303 r = self.rev(n) | |
| 304 if n not in seen: | |
| 305 seen[n] = 1 | |
| 306 yield (-d, n) | |
| 307 for p in self.parents(n): | |
| 308 heapq.heappush(h, (-dist[p], p)) | |
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309 |
| 147 | 310 x = ancestors(a) |
| 311 y = ancestors(b) | |
| 312 lx = x.next() | |
| 313 ly = y.next() | |
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314 |
| 147 | 315 # increment each ancestor list until it is closer to root than |
| 316 # the other, or they match | |
| 317 while 1: | |
| 318 if lx == ly: | |
| 319 return lx[1] | |
| 320 elif lx < ly: | |
| 321 ly = y.next() | |
| 322 elif lx > ly: | |
| 323 lx = x.next() | |
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324 |
| 46 | 325 def group(self, linkmap): |
| 326 # given a list of changeset revs, return a set of deltas and | |
| 94 | 327 # metadata corresponding to nodes. the first delta is |
| 46 | 328 # parent(nodes[0]) -> nodes[0] the receiver is guaranteed to |
| 329 # have this parent as it has all history before these | |
| 330 # changesets. parent is parent[0] | |
| 331 | |
| 332 revs = [] | |
| 333 needed = {} | |
| 334 | |
| 335 # find file nodes/revs that match changeset revs | |
| 336 for i in xrange(0, self.count()): | |
| 337 if self.index[i][3] in linkmap: | |
| 338 revs.append(i) | |
| 339 needed[i] = 1 | |
| 340 | |
| 341 # if we don't have any revisions touched by these changesets, bail | |
| 192 | 342 if not revs: |
| 343 yield struct.pack(">l", 0) | |
| 344 return | |
| 46 | 345 |
| 346 # add the parent of the first rev | |
| 347 p = self.parents(self.node(revs[0]))[0] | |
| 348 revs.insert(0, self.rev(p)) | |
| 349 | |
| 350 # for each delta that isn't contiguous in the log, we need to | |
| 351 # reconstruct the base, reconstruct the result, and then | |
| 352 # calculate the delta. We also need to do this where we've | |
| 353 # stored a full version and not a delta | |
| 354 for i in xrange(0, len(revs) - 1): | |
| 355 a, b = revs[i], revs[i + 1] | |
| 356 if a + 1 != b or self.base(b) == b: | |
| 357 for j in xrange(self.base(a), a + 1): | |
| 358 needed[j] = 1 | |
| 359 for j in xrange(self.base(b), b + 1): | |
| 360 needed[j] = 1 | |
| 361 | |
| 362 # calculate spans to retrieve from datafile | |
| 363 needed = needed.keys() | |
| 364 needed.sort() | |
| 365 spans = [] | |
| 192 | 366 oo = -1 |
| 367 ol = 0 | |
| 46 | 368 for n in needed: |
| 369 if n < 0: continue | |
| 370 o = self.start(n) | |
| 371 l = self.length(n) | |
| 192 | 372 if oo + ol == o: # can we merge with the previous? |
| 373 nl = spans[-1][2] | |
| 374 nl.append((n, l)) | |
| 375 ol += l | |
| 376 spans[-1] = (oo, ol, nl) | |
| 46 | 377 else: |
| 192 | 378 oo = o |
| 379 ol = l | |
| 380 spans.append((oo, ol, [(n, l)])) | |
| 46 | 381 |
| 382 # read spans in, divide up chunks | |
| 383 chunks = {} | |
| 192 | 384 for span in spans: |
| 46 | 385 # we reopen the file for each span to make http happy for now |
| 386 f = self.opener(self.datafile) | |
| 387 f.seek(span[0]) | |
| 388 data = f.read(span[1]) | |
| 389 | |
| 390 # divide up the span | |
| 391 pos = 0 | |
| 392 for r, l in span[2]: | |
| 192 | 393 chunks[r] = decompress(data[pos: pos + l]) |
| 46 | 394 pos += l |
| 395 | |
| 396 # helper to reconstruct intermediate versions | |
| 397 def construct(text, base, rev): | |
| 192 | 398 bins = [chunks[r] for r in xrange(base + 1, rev + 1)] |
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399 return mdiff.patches(text, bins) |
| 46 | 400 |
| 401 # build deltas | |
| 402 deltas = [] | |
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403 for d in xrange(0, len(revs) - 1): |
| 46 | 404 a, b = revs[d], revs[d + 1] |
| 405 n = self.node(b) | |
| 192 | 406 |
| 407 # do we need to construct a new delta? | |
| 46 | 408 if a + 1 != b or self.base(b) == b: |
| 409 if a >= 0: | |
| 410 base = self.base(a) | |
| 192 | 411 ta = chunks[self.base(a)] |
| 46 | 412 ta = construct(ta, base, a) |
| 413 else: | |
| 414 ta = "" | |
| 415 | |
| 416 base = self.base(b) | |
| 417 if a > base: | |
| 418 base = a | |
| 419 tb = ta | |
| 420 else: | |
| 192 | 421 tb = chunks[self.base(b)] |
| 46 | 422 tb = construct(tb, base, b) |
| 423 d = self.diff(ta, tb) | |
| 424 else: | |
| 192 | 425 d = chunks[b] |
| 46 | 426 |
| 427 p = self.parents(n) | |
| 428 meta = n + p[0] + p[1] + linkmap[self.linkrev(n)] | |
| 429 l = struct.pack(">l", len(meta) + len(d) + 4) | |
| 192 | 430 yield l |
| 431 yield meta | |
| 432 yield d | |
| 46 | 433 |
| 192 | 434 yield struct.pack(">l", 0) |
| 435 | |
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436 def addgroup(self, revs, linkmapper, transaction, unique = 0): |
| 46 | 437 # given a set of deltas, add them to the revision log. the |
| 438 # first delta is against its parent, which should be in our | |
| 439 # log, the rest are against the previous delta. | |
| 440 | |
| 441 # track the base of the current delta log | |
| 442 r = self.count() | |
| 443 t = r - 1 | |
| 192 | 444 node = nullid |
| 46 | 445 |
| 446 base = prev = -1 | |
| 447 start = end = 0 | |
| 448 if r: | |
| 449 start = self.start(self.base(t)) | |
| 450 end = self.end(t) | |
| 451 measure = self.length(self.base(t)) | |
| 452 base = self.base(t) | |
| 453 prev = self.tip() | |
| 454 | |
| 455 transaction.add(self.datafile, end) | |
| 456 transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
| 457 dfh = self.opener(self.datafile, "a") | |
| 458 ifh = self.opener(self.indexfile, "a") | |
| 459 | |
| 460 # loop through our set of deltas | |
| 192 | 461 chain = None |
| 462 for chunk in revs: | |
| 463 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
| 94 | 464 link = linkmapper(cs) |
| 77 | 465 if node in self.nodemap: |
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466 # this can happen if two branches make the same change |
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467 if unique: |
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468 raise "already have %s" % hex(node[:4]) |
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469 continue |
| 192 | 470 delta = chunk[80:] |
| 471 | |
| 472 if not chain: | |
| 473 # retrieve the parent revision of the delta chain | |
| 474 chain = p1 | |
| 475 if not chain in self.nodemap: | |
| 476 raise "unknown base %s" % short(chain[:4]) | |
| 46 | 477 |
| 478 # full versions are inserted when the needed deltas become | |
| 479 # comparable to the uncompressed text or when the previous | |
| 480 # version is not the one we have a delta against. We use | |
| 481 # the size of the previous full rev as a proxy for the | |
| 482 # current size. | |
| 483 | |
| 484 if chain == prev: | |
| 485 cdelta = compress(delta) | |
| 486 | |
| 487 if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
| 488 # flush our writes here so we can read it in revision | |
| 489 dfh.flush() | |
| 490 ifh.flush() | |
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491 text = self.revision(chain) |
| 73 | 492 text = self.patches(text, [delta]) |
| 46 | 493 chk = self.addrevision(text, transaction, link, p1, p2) |
| 494 if chk != node: | |
| 495 raise "consistency error adding group" | |
| 496 measure = len(text) | |
| 497 else: | |
| 498 e = (end, len(cdelta), self.base(t), link, p1, p2, node) | |
| 499 self.index.append(e) | |
| 500 self.nodemap[node] = r | |
| 501 dfh.write(cdelta) | |
| 502 ifh.write(struct.pack(indexformat, *e)) | |
| 503 | |
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504 t, r, chain, prev = r, r + 1, node, node |
| 46 | 505 start = self.start(self.base(t)) |
| 506 end = self.end(t) | |
| 507 | |
| 508 dfh.close() | |
| 509 ifh.close() | |
| 510 return node |