Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/revlog.py @ 547:4fc63e22b1fe
Merge with TAH
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Merge with TAH
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| author | mpm@selenic.com |
|---|---|
| date | Thu, 30 Jun 2005 23:28:16 -0800 |
| parents | 0e9234a1a3f6 eda4c32c167a |
| children | 6ebe118280bd |
| 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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36
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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[:6]) |
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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() |
| 531 | 40 s = sha.new(l[0]) |
| 41 s.update(l[1]) | |
| 42 s.update(text) | |
| 43 return s.digest() | |
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44 |
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45 nullid = "\0" * 20 |
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46 indexformat = ">4l20s20s20s" |
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47 |
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48 class lazyparser: |
| 323 | 49 def __init__(self, data, revlog): |
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50 self.data = data |
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51 self.s = struct.calcsize(indexformat) |
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52 self.l = len(data)/self.s |
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53 self.index = [None] * self.l |
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54 self.map = {nullid: -1} |
| 323 | 55 self.all = 0 |
| 56 self.revlog = revlog | |
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57 |
| 323 | 58 def load(self, pos=None): |
| 59 if self.all: return | |
| 60 if pos is not None: | |
| 61 block = pos / 1000 | |
| 62 i = block * 1000 | |
| 63 end = min(self.l, i + 1000) | |
| 64 else: | |
| 65 self.all = 1 | |
| 66 i = 0 | |
| 67 end = self.l | |
| 68 self.revlog.index = self.index | |
| 69 self.revlog.nodemap = self.map | |
| 515 | 70 |
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71 while i < end: |
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72 d = self.data[i * self.s: (i + 1) * self.s] |
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73 e = struct.unpack(indexformat, d) |
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74 self.index[i] = e |
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75 self.map[e[6]] = i |
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76 i += 1 |
| 515 | 77 |
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78 class lazyindex: |
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79 def __init__(self, parser): |
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80 self.p = parser |
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81 def __len__(self): |
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82 return len(self.p.index) |
| 115 | 83 def load(self, pos): |
| 84 self.p.load(pos) | |
| 85 return self.p.index[pos] | |
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86 def __getitem__(self, pos): |
| 115 | 87 return self.p.index[pos] or self.load(pos) |
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88 def append(self, e): |
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89 self.p.index.append(e) |
| 515 | 90 |
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91 class lazymap: |
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92 def __init__(self, parser): |
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93 self.p = parser |
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94 def load(self, key): |
| 323 | 95 if self.p.all: return |
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96 n = self.p.data.find(key) |
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97 if n < 0: raise KeyError("node " + hex(key)) |
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98 pos = n / self.p.s |
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99 self.p.load(pos) |
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100 def __contains__(self, key): |
| 323 | 101 self.p.load() |
| 102 return key in self.p.map | |
| 97 | 103 def __iter__(self): |
| 469 | 104 yield nullid |
| 97 | 105 for i in xrange(self.p.l): |
| 106 try: | |
| 107 yield self.p.index[i][6] | |
| 108 except: | |
| 109 self.p.load(i) | |
| 110 yield self.p.index[i][6] | |
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111 def __getitem__(self, key): |
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112 try: |
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113 return self.p.map[key] |
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114 except KeyError: |
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115 try: |
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116 self.load(key) |
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117 return self.p.map[key] |
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118 except KeyError: |
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119 raise KeyError("node " + hex(key)) |
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120 def __setitem__(self, key, val): |
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121 self.p.map[key] = val |
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122 |
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123 class revlog: |
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124 def __init__(self, opener, indexfile, datafile): |
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125 self.indexfile = indexfile |
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126 self.datafile = datafile |
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127 self.opener = opener |
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128 self.cache = None |
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129 |
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130 try: |
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131 i = self.opener(self.indexfile).read() |
| 73 | 132 except IOError: |
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133 i = "" |
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134 |
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135 if len(i) > 10000: |
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136 # big index, let's parse it on demand |
| 323 | 137 parser = lazyparser(i, self) |
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138 self.index = lazyindex(parser) |
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139 self.nodemap = lazymap(parser) |
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140 else: |
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141 s = struct.calcsize(indexformat) |
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142 l = len(i) / s |
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143 self.index = [None] * l |
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144 m = [None] * l |
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145 |
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146 n = 0 |
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147 for f in xrange(0, len(i), s): |
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148 # offset, size, base, linkrev, p1, p2, nodeid |
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149 e = struct.unpack(indexformat, i[f:f + s]) |
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150 m[n] = (e[6], n) |
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151 self.index[n] = e |
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152 n += 1 |
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153 |
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154 self.nodemap = dict(m) |
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155 self.nodemap[nullid] = -1 |
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156 |
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157 def tip(self): return self.node(len(self.index) - 1) |
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158 def count(self): return len(self.index) |
| 26 | 159 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] |
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160 def rev(self, node): return self.nodemap[node] |
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161 def linkrev(self, node): return self.index[self.nodemap[node]][3] |
| 2 | 162 def parents(self, node): |
| 163 if node == nullid: return (nullid, nullid) | |
| 164 return self.index[self.nodemap[node]][4:6] | |
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165 |
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166 def start(self, rev): return self.index[rev][0] |
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167 def length(self, rev): return self.index[rev][1] |
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168 def end(self, rev): return self.start(rev) + self.length(rev) |
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169 def base(self, rev): return self.index[rev][2] |
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170 |
| 221 | 171 def heads(self): |
| 172 p = {} | |
| 173 h = [] | |
| 243 | 174 for r in range(self.count() - 1, -1, -1): |
| 221 | 175 n = self.node(r) |
| 176 if n not in p: | |
| 177 h.append(n) | |
| 178 for pn in self.parents(n): | |
| 179 p[pn] = 1 | |
| 180 return h | |
| 370 | 181 |
| 182 def children(self, node): | |
| 183 c = [] | |
| 184 p = self.rev(node) | |
| 185 for r in range(p + 1, self.count()): | |
| 186 n = self.node(r) | |
| 187 for pn in self.parents(n): | |
| 188 if pn == p: | |
| 189 c.append(p) | |
| 190 continue | |
| 191 elif pn == nullid: | |
| 192 continue | |
| 193 return c | |
| 515 | 194 |
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195 def lookup(self, id): |
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196 try: |
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197 rev = int(id) |
| 469 | 198 if str(rev) != id: raise ValueError |
| 199 if rev < 0: rev = self.count() + rev | |
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200 if rev < 0 or rev >= self.count(): raise ValueError |
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201 return self.node(rev) |
| 469 | 202 except (ValueError, OverflowError): |
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203 c = [] |
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204 for n in self.nodemap: |
| 469 | 205 if hex(n).startswith(id): |
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206 c.append(n) |
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207 if len(c) > 1: raise KeyError("Ambiguous identifier") |
| 67 | 208 if len(c) < 1: raise KeyError("No match found") |
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209 return c[0] |
| 515 | 210 |
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211 return None |
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212 |
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213 def diff(self, a, b): |
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214 return mdiff.textdiff(a, b) |
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215 |
| 73 | 216 def patches(self, t, pl): |
| 217 return mdiff.patches(t, pl) | |
| 218 | |
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219 def delta(self, node): |
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220 r = self.rev(node) |
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221 b = self.base(r) |
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222 if r == b: |
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223 return self.diff(self.revision(self.node(r - 1)), |
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224 self.revision(node)) |
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225 else: |
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226 f = self.opener(self.datafile) |
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227 f.seek(self.start(r)) |
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228 data = f.read(self.length(r)) |
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229 return decompress(data) |
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230 |
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231 def revision(self, node): |
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232 if node == nullid: return "" |
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233 if self.cache and self.cache[0] == node: return self.cache[2] |
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234 |
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235 text = None |
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236 rev = self.rev(node) |
| 117 | 237 start, length, base, link, p1, p2, node = self.index[rev] |
| 238 end = start + length | |
| 239 if base != rev: start = self.start(base) | |
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240 |
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241 if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
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242 base = self.cache[1] |
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243 start = self.start(base + 1) |
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244 text = self.cache[2] |
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245 last = 0 |
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246 |
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247 f = self.opener(self.datafile) |
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248 f.seek(start) |
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249 data = f.read(end - start) |
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250 |
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251 if not text: |
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252 last = self.length(base) |
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253 text = decompress(data[:last]) |
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254 |
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255 bins = [] |
| 64 | 256 for r in xrange(base + 1, rev + 1): |
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257 s = self.length(r) |
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258 bins.append(decompress(data[last:last + s])) |
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259 last = last + s |
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260 |
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261 text = mdiff.patches(text, bins) |
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262 |
| 26 | 263 if node != hash(text, p1, p2): |
| 98 | 264 raise IOError("integrity check failed on %s:%d" |
| 265 % (self.datafile, rev)) | |
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266 |
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267 self.cache = (node, rev, text) |
| 515 | 268 return text |
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269 |
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270 def addrevision(self, text, transaction, link, p1=None, p2=None): |
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271 if text is None: text = "" |
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272 if p1 is None: p1 = self.tip() |
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273 if p2 is None: p2 = nullid |
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274 |
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275 node = hash(text, p1, p2) |
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276 |
| 301 | 277 if node in self.nodemap: |
| 278 return node | |
| 279 | |
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280 n = self.count() |
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281 t = n - 1 |
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282 |
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283 if n: |
| 64 | 284 base = self.base(t) |
| 285 start = self.start(base) | |
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286 end = self.end(t) |
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287 prev = self.revision(self.tip()) |
| 98 | 288 d = self.diff(prev, text) |
| 289 data = compress(d) | |
| 64 | 290 dist = end - start + len(data) |
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291 |
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292 # full versions are inserted when the needed deltas |
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293 # become comparable to the uncompressed text |
| 64 | 294 if not n or dist > len(text) * 2: |
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295 data = compress(text) |
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296 base = n |
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297 else: |
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298 base = self.base(t) |
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299 |
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300 offset = 0 |
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301 if t >= 0: |
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302 offset = self.end(t) |
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303 |
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304 e = (offset, len(data), base, link, p1, p2, node) |
| 515 | 305 |
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306 self.index.append(e) |
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307 self.nodemap[node] = n |
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308 entry = struct.pack(indexformat, *e) |
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309 |
| 26 | 310 transaction.add(self.datafile, e[0]) |
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311 self.opener(self.datafile, "a").write(data) |
| 41 | 312 transaction.add(self.indexfile, n * len(entry)) |
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313 self.opener(self.indexfile, "a").write(entry) |
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314 |
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315 self.cache = (node, n, text) |
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316 return node |
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317 |
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318 def ancestor(self, a, b): |
| 147 | 319 # calculate the distance of every node from root |
| 320 dist = {nullid: 0} | |
| 321 for i in xrange(self.count()): | |
| 322 n = self.node(i) | |
| 323 p1, p2 = self.parents(n) | |
| 324 dist[n] = max(dist[p1], dist[p2]) + 1 | |
| 515 | 325 |
| 147 | 326 # traverse ancestors in order of decreasing distance from root |
| 327 def ancestors(node): | |
| 328 # we store negative distances because heap returns smallest member | |
| 329 h = [(-dist[node], node)] | |
| 330 seen = {} | |
| 331 earliest = self.count() | |
| 332 while h: | |
| 333 d, n = heapq.heappop(h) | |
| 334 if n not in seen: | |
| 335 seen[n] = 1 | |
| 381 | 336 r = self.rev(n) |
| 337 yield (-d, r, n) | |
| 147 | 338 for p in self.parents(n): |
| 339 heapq.heappush(h, (-dist[p], p)) | |
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340 |
| 147 | 341 x = ancestors(a) |
| 342 y = ancestors(b) | |
| 343 lx = x.next() | |
| 344 ly = y.next() | |
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345 |
| 147 | 346 # increment each ancestor list until it is closer to root than |
| 347 # the other, or they match | |
| 348 while 1: | |
| 349 if lx == ly: | |
| 381 | 350 return lx[2] |
| 147 | 351 elif lx < ly: |
| 352 ly = y.next() | |
| 353 elif lx > ly: | |
| 354 lx = x.next() | |
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355 |
| 46 | 356 def group(self, linkmap): |
| 357 # given a list of changeset revs, return a set of deltas and | |
| 94 | 358 # metadata corresponding to nodes. the first delta is |
| 46 | 359 # parent(nodes[0]) -> nodes[0] the receiver is guaranteed to |
| 360 # have this parent as it has all history before these | |
| 361 # changesets. parent is parent[0] | |
| 362 | |
| 363 revs = [] | |
| 364 needed = {} | |
| 365 | |
| 366 # find file nodes/revs that match changeset revs | |
| 367 for i in xrange(0, self.count()): | |
| 368 if self.index[i][3] in linkmap: | |
| 369 revs.append(i) | |
| 370 needed[i] = 1 | |
| 371 | |
| 372 # if we don't have any revisions touched by these changesets, bail | |
| 192 | 373 if not revs: |
| 374 yield struct.pack(">l", 0) | |
| 375 return | |
| 46 | 376 |
| 377 # add the parent of the first rev | |
| 378 p = self.parents(self.node(revs[0]))[0] | |
| 379 revs.insert(0, self.rev(p)) | |
| 380 | |
| 381 # for each delta that isn't contiguous in the log, we need to | |
| 382 # reconstruct the base, reconstruct the result, and then | |
| 383 # calculate the delta. We also need to do this where we've | |
| 384 # stored a full version and not a delta | |
| 385 for i in xrange(0, len(revs) - 1): | |
| 386 a, b = revs[i], revs[i + 1] | |
| 387 if a + 1 != b or self.base(b) == b: | |
| 388 for j in xrange(self.base(a), a + 1): | |
| 389 needed[j] = 1 | |
| 390 for j in xrange(self.base(b), b + 1): | |
| 391 needed[j] = 1 | |
| 392 | |
| 393 # calculate spans to retrieve from datafile | |
| 394 needed = needed.keys() | |
| 395 needed.sort() | |
| 396 spans = [] | |
| 192 | 397 oo = -1 |
| 398 ol = 0 | |
| 46 | 399 for n in needed: |
| 400 if n < 0: continue | |
| 401 o = self.start(n) | |
| 402 l = self.length(n) | |
| 192 | 403 if oo + ol == o: # can we merge with the previous? |
| 404 nl = spans[-1][2] | |
| 405 nl.append((n, l)) | |
| 406 ol += l | |
| 407 spans[-1] = (oo, ol, nl) | |
| 46 | 408 else: |
| 192 | 409 oo = o |
| 410 ol = l | |
| 411 spans.append((oo, ol, [(n, l)])) | |
| 46 | 412 |
| 413 # read spans in, divide up chunks | |
| 414 chunks = {} | |
| 192 | 415 for span in spans: |
| 46 | 416 # we reopen the file for each span to make http happy for now |
| 417 f = self.opener(self.datafile) | |
| 418 f.seek(span[0]) | |
| 419 data = f.read(span[1]) | |
| 420 | |
| 421 # divide up the span | |
| 422 pos = 0 | |
| 423 for r, l in span[2]: | |
| 192 | 424 chunks[r] = decompress(data[pos: pos + l]) |
| 46 | 425 pos += l |
| 426 | |
| 427 # helper to reconstruct intermediate versions | |
| 428 def construct(text, base, rev): | |
| 192 | 429 bins = [chunks[r] for r in xrange(base + 1, rev + 1)] |
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430 return mdiff.patches(text, bins) |
| 46 | 431 |
| 432 # build deltas | |
| 433 deltas = [] | |
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434 for d in xrange(0, len(revs) - 1): |
| 46 | 435 a, b = revs[d], revs[d + 1] |
| 436 n = self.node(b) | |
| 192 | 437 |
| 438 # do we need to construct a new delta? | |
| 46 | 439 if a + 1 != b or self.base(b) == b: |
| 440 if a >= 0: | |
| 441 base = self.base(a) | |
| 192 | 442 ta = chunks[self.base(a)] |
| 46 | 443 ta = construct(ta, base, a) |
| 444 else: | |
| 445 ta = "" | |
| 515 | 446 |
| 46 | 447 base = self.base(b) |
| 448 if a > base: | |
| 449 base = a | |
| 450 tb = ta | |
| 451 else: | |
| 192 | 452 tb = chunks[self.base(b)] |
| 46 | 453 tb = construct(tb, base, b) |
| 454 d = self.diff(ta, tb) | |
| 455 else: | |
| 192 | 456 d = chunks[b] |
| 46 | 457 |
| 458 p = self.parents(n) | |
| 459 meta = n + p[0] + p[1] + linkmap[self.linkrev(n)] | |
| 460 l = struct.pack(">l", len(meta) + len(d) + 4) | |
| 192 | 461 yield l |
| 462 yield meta | |
| 463 yield d | |
| 46 | 464 |
| 192 | 465 yield struct.pack(">l", 0) |
| 466 | |
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467 def addgroup(self, revs, linkmapper, transaction, unique = 0): |
| 46 | 468 # given a set of deltas, add them to the revision log. the |
| 469 # first delta is against its parent, which should be in our | |
| 470 # log, the rest are against the previous delta. | |
| 471 | |
| 472 # track the base of the current delta log | |
| 473 r = self.count() | |
| 474 t = r - 1 | |
| 192 | 475 node = nullid |
| 515 | 476 |
| 46 | 477 base = prev = -1 |
| 478 start = end = 0 | |
| 479 if r: | |
| 480 start = self.start(self.base(t)) | |
| 481 end = self.end(t) | |
| 482 measure = self.length(self.base(t)) | |
| 483 base = self.base(t) | |
| 484 prev = self.tip() | |
| 485 | |
| 486 transaction.add(self.datafile, end) | |
| 487 transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
| 488 dfh = self.opener(self.datafile, "a") | |
| 489 ifh = self.opener(self.indexfile, "a") | |
| 490 | |
| 491 # loop through our set of deltas | |
| 192 | 492 chain = None |
| 493 for chunk in revs: | |
| 494 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
| 94 | 495 link = linkmapper(cs) |
| 77 | 496 if node in self.nodemap: |
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497 # this can happen if two branches make the same change |
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498 if unique: |
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499 raise "already have %s" % hex(node[:4]) |
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500 continue |
| 192 | 501 delta = chunk[80:] |
| 502 | |
| 503 if not chain: | |
| 504 # retrieve the parent revision of the delta chain | |
| 505 chain = p1 | |
| 506 if not chain in self.nodemap: | |
| 507 raise "unknown base %s" % short(chain[:4]) | |
| 46 | 508 |
| 509 # full versions are inserted when the needed deltas become | |
| 510 # comparable to the uncompressed text or when the previous | |
| 511 # version is not the one we have a delta against. We use | |
| 512 # the size of the previous full rev as a proxy for the | |
| 513 # current size. | |
| 514 | |
| 515 if chain == prev: | |
| 516 cdelta = compress(delta) | |
| 517 | |
| 518 if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
| 519 # flush our writes here so we can read it in revision | |
| 520 dfh.flush() | |
| 521 ifh.flush() | |
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522 text = self.revision(chain) |
| 73 | 523 text = self.patches(text, [delta]) |
| 46 | 524 chk = self.addrevision(text, transaction, link, p1, p2) |
| 525 if chk != node: | |
| 526 raise "consistency error adding group" | |
| 527 measure = len(text) | |
| 528 else: | |
| 529 e = (end, len(cdelta), self.base(t), link, p1, p2, node) | |
| 530 self.index.append(e) | |
| 531 self.nodemap[node] = r | |
| 532 dfh.write(cdelta) | |
| 533 ifh.write(struct.pack(indexformat, *e)) | |
| 534 | |
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535 t, r, chain, prev = r, r + 1, node, node |
| 46 | 536 start = self.start(self.base(t)) |
| 537 end = self.end(t) | |
| 538 | |
| 539 dfh.close() | |
| 540 ifh.close() | |
| 541 return node |