Mercurial > hg
annotate hgext/remotefilelog/historypack.py @ 42725:7492899c6fc6
rawdata: implement the method for `remotefilelog` too
This is needed for all storage implementations.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 07 Aug 2019 20:51:52 +0200 |
parents | 876494fd967d |
children | 2372284d9457 |
rev | line source |
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1 from __future__ import absolute_import |
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2 |
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3 import hashlib |
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4 import struct |
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5 |
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6 from mercurial.node import hex, nullid |
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7 from mercurial import ( |
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8 pycompat, |
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9 util, |
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10 ) |
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11 from . import ( |
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12 basepack, |
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13 constants, |
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14 shallowutil, |
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15 ) |
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16 |
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17 # (filename hash, offset, size) |
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18 INDEXFORMAT2 = '!20sQQII' |
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19 INDEXENTRYLENGTH2 = struct.calcsize(INDEXFORMAT2) |
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20 NODELENGTH = 20 |
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21 |
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22 NODEINDEXFORMAT = '!20sQ' |
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23 NODEINDEXENTRYLENGTH = struct.calcsize(NODEINDEXFORMAT) |
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24 |
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25 # (node, p1, p2, linknode) |
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26 PACKFORMAT = "!20s20s20s20sH" |
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27 PACKENTRYLENGTH = 82 |
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28 |
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29 ENTRYCOUNTSIZE = 4 |
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30 |
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31 INDEXSUFFIX = '.histidx' |
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32 PACKSUFFIX = '.histpack' |
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33 |
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34 ANC_NODE = 0 |
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35 ANC_P1NODE = 1 |
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36 ANC_P2NODE = 2 |
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37 ANC_LINKNODE = 3 |
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38 ANC_COPYFROM = 4 |
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39 |
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40 class historypackstore(basepack.basepackstore): |
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41 INDEXSUFFIX = INDEXSUFFIX |
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42 PACKSUFFIX = PACKSUFFIX |
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43 |
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44 def getpack(self, path): |
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45 return historypack(path) |
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46 |
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47 def getancestors(self, name, node, known=None): |
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48 for pack in self.packs: |
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49 try: |
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50 return pack.getancestors(name, node, known=known) |
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51 except KeyError: |
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52 pass |
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53 |
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54 for pack in self.refresh(): |
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55 try: |
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56 return pack.getancestors(name, node, known=known) |
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57 except KeyError: |
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58 pass |
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59 |
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60 raise KeyError((name, node)) |
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61 |
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62 def getnodeinfo(self, name, node): |
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63 for pack in self.packs: |
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64 try: |
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65 return pack.getnodeinfo(name, node) |
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66 except KeyError: |
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67 pass |
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68 |
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69 for pack in self.refresh(): |
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70 try: |
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71 return pack.getnodeinfo(name, node) |
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72 except KeyError: |
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73 pass |
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74 |
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75 raise KeyError((name, node)) |
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76 |
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77 def add(self, filename, node, p1, p2, linknode, copyfrom): |
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78 raise RuntimeError("cannot add to historypackstore (%s:%s)" |
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79 % (filename, hex(node))) |
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80 |
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81 class historypack(basepack.basepack): |
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82 INDEXSUFFIX = INDEXSUFFIX |
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83 PACKSUFFIX = PACKSUFFIX |
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84 |
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85 SUPPORTED_VERSIONS = [2] |
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86 |
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87 def __init__(self, path): |
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88 super(historypack, self).__init__(path) |
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89 self.INDEXFORMAT = INDEXFORMAT2 |
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90 self.INDEXENTRYLENGTH = INDEXENTRYLENGTH2 |
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91 |
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92 def getmissing(self, keys): |
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93 missing = [] |
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94 for name, node in keys: |
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95 try: |
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96 self._findnode(name, node) |
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97 except KeyError: |
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98 missing.append((name, node)) |
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99 |
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100 return missing |
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101 |
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102 def getancestors(self, name, node, known=None): |
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103 """Returns as many ancestors as we're aware of. |
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104 |
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105 return value: { |
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106 node: (p1, p2, linknode, copyfrom), |
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107 ... |
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108 } |
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109 """ |
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110 if known and node in known: |
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111 return [] |
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112 |
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113 ancestors = self._getancestors(name, node, known=known) |
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114 results = {} |
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115 for ancnode, p1, p2, linknode, copyfrom in ancestors: |
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116 results[ancnode] = (p1, p2, linknode, copyfrom) |
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117 |
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118 if not results: |
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119 raise KeyError((name, node)) |
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120 return results |
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121 |
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122 def getnodeinfo(self, name, node): |
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123 # Drop the node from the tuple before returning, since the result should |
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124 # just be (p1, p2, linknode, copyfrom) |
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125 return self._findnode(name, node)[1:] |
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126 |
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127 def _getancestors(self, name, node, known=None): |
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128 if known is None: |
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129 known = set() |
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130 section = self._findsection(name) |
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131 filename, offset, size, nodeindexoffset, nodeindexsize = section |
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132 pending = set((node,)) |
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133 o = 0 |
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134 while o < size: |
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135 if not pending: |
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136 break |
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137 entry, copyfrom = self._readentry(offset + o) |
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138 o += PACKENTRYLENGTH |
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139 if copyfrom: |
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140 o += len(copyfrom) |
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141 |
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142 ancnode = entry[ANC_NODE] |
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143 if ancnode in pending: |
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144 pending.remove(ancnode) |
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145 p1node = entry[ANC_P1NODE] |
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146 p2node = entry[ANC_P2NODE] |
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147 if p1node != nullid and p1node not in known: |
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148 pending.add(p1node) |
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149 if p2node != nullid and p2node not in known: |
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150 pending.add(p2node) |
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151 |
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152 yield (ancnode, p1node, p2node, entry[ANC_LINKNODE], copyfrom) |
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153 |
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154 def _readentry(self, offset): |
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155 data = self._data |
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156 entry = struct.unpack(PACKFORMAT, data[offset:offset + PACKENTRYLENGTH]) |
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157 copyfrom = None |
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158 copyfromlen = entry[ANC_COPYFROM] |
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159 if copyfromlen != 0: |
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160 offset += PACKENTRYLENGTH |
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161 copyfrom = data[offset:offset + copyfromlen] |
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162 return entry, copyfrom |
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163 |
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164 def add(self, filename, node, p1, p2, linknode, copyfrom): |
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165 raise RuntimeError("cannot add to historypack (%s:%s)" % |
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166 (filename, hex(node))) |
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167 |
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168 def _findnode(self, name, node): |
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169 if self.VERSION == 0: |
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170 ancestors = self._getancestors(name, node) |
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171 for ancnode, p1node, p2node, linknode, copyfrom in ancestors: |
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172 if ancnode == node: |
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173 return (ancnode, p1node, p2node, linknode, copyfrom) |
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174 else: |
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175 section = self._findsection(name) |
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176 nodeindexoffset, nodeindexsize = section[3:] |
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177 entry = self._bisect(node, nodeindexoffset, |
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178 nodeindexoffset + nodeindexsize, |
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179 NODEINDEXENTRYLENGTH) |
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180 if entry is not None: |
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181 node, offset = struct.unpack(NODEINDEXFORMAT, entry) |
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182 entry, copyfrom = self._readentry(offset) |
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183 # Drop the copyfromlen from the end of entry, and replace it |
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184 # with the copyfrom string. |
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185 return entry[:4] + (copyfrom,) |
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186 |
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187 raise KeyError("unable to find history for %s:%s" % (name, hex(node))) |
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188 |
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189 def _findsection(self, name): |
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190 params = self.params |
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191 namehash = hashlib.sha1(name).digest() |
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192 fanoutkey = struct.unpack(params.fanoutstruct, |
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193 namehash[:params.fanoutprefix])[0] |
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194 fanout = self._fanouttable |
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195 |
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196 start = fanout[fanoutkey] + params.indexstart |
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197 indexend = self._indexend |
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198 |
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199 for i in pycompat.xrange(fanoutkey + 1, params.fanoutcount): |
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200 end = fanout[i] + params.indexstart |
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201 if end != start: |
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202 break |
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203 else: |
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204 end = indexend |
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205 |
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206 entry = self._bisect(namehash, start, end, self.INDEXENTRYLENGTH) |
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207 if not entry: |
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208 raise KeyError(name) |
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209 |
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210 rawentry = struct.unpack(self.INDEXFORMAT, entry) |
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211 x, offset, size, nodeindexoffset, nodeindexsize = rawentry |
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212 rawnamelen = self._index[nodeindexoffset:nodeindexoffset + |
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213 constants.FILENAMESIZE] |
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214 actualnamelen = struct.unpack('!H', rawnamelen)[0] |
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215 nodeindexoffset += constants.FILENAMESIZE |
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216 actualname = self._index[nodeindexoffset:nodeindexoffset + |
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217 actualnamelen] |
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218 if actualname != name: |
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219 raise KeyError("found file name %s when looking for %s" % |
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220 (actualname, name)) |
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221 nodeindexoffset += actualnamelen |
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222 |
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223 filenamelength = struct.unpack('!H', self._data[offset:offset + |
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224 constants.FILENAMESIZE])[0] |
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225 offset += constants.FILENAMESIZE |
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226 |
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227 actualname = self._data[offset:offset + filenamelength] |
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228 offset += filenamelength |
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229 |
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230 if name != actualname: |
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231 raise KeyError("found file name %s when looking for %s" % |
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232 (actualname, name)) |
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233 |
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234 # Skip entry list size |
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235 offset += ENTRYCOUNTSIZE |
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236 |
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237 nodelistoffset = offset |
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238 nodelistsize = (size - constants.FILENAMESIZE - filenamelength - |
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239 ENTRYCOUNTSIZE) |
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240 return (name, nodelistoffset, nodelistsize, |
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241 nodeindexoffset, nodeindexsize) |
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242 |
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243 def _bisect(self, node, start, end, entrylen): |
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244 # Bisect between start and end to find node |
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245 origstart = start |
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246 startnode = self._index[start:start + NODELENGTH] |
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247 endnode = self._index[end:end + NODELENGTH] |
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248 |
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249 if startnode == node: |
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250 return self._index[start:start + entrylen] |
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251 elif endnode == node: |
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252 return self._index[end:end + entrylen] |
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253 else: |
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254 while start < end - entrylen: |
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255 mid = start + (end - start) // 2 |
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256 mid = mid - ((mid - origstart) % entrylen) |
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257 midnode = self._index[mid:mid + NODELENGTH] |
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258 if midnode == node: |
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259 return self._index[mid:mid + entrylen] |
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260 if node > midnode: |
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261 start = mid |
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262 elif node < midnode: |
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263 end = mid |
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264 return None |
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265 |
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266 def markledger(self, ledger, options=None): |
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267 for filename, node in self: |
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268 ledger.markhistoryentry(self, filename, node) |
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269 |
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270 def cleanup(self, ledger): |
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271 entries = ledger.sources.get(self, []) |
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272 allkeys = set(self) |
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273 repackedkeys = set((e.filename, e.node) for e in entries if |
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274 e.historyrepacked) |
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275 |
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276 if len(allkeys - repackedkeys) == 0: |
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277 if self.path not in ledger.created: |
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278 util.unlinkpath(self.indexpath, ignoremissing=True) |
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279 util.unlinkpath(self.packpath, ignoremissing=True) |
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280 |
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281 def __iter__(self): |
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282 for f, n, x, x, x, x in self.iterentries(): |
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283 yield f, n |
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284 |
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285 def iterentries(self): |
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286 # Start at 1 to skip the header |
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287 offset = 1 |
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288 while offset < self.datasize: |
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289 data = self._data |
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290 # <2 byte len> + <filename> |
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291 filenamelen = struct.unpack('!H', data[offset:offset + |
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292 constants.FILENAMESIZE])[0] |
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293 offset += constants.FILENAMESIZE |
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294 filename = data[offset:offset + filenamelen] |
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295 offset += filenamelen |
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296 |
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297 revcount = struct.unpack('!I', data[offset:offset + |
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298 ENTRYCOUNTSIZE])[0] |
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299 offset += ENTRYCOUNTSIZE |
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300 |
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301 for i in pycompat.xrange(revcount): |
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302 entry = struct.unpack(PACKFORMAT, data[offset:offset + |
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303 PACKENTRYLENGTH]) |
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304 offset += PACKENTRYLENGTH |
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305 |
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306 copyfrom = data[offset:offset + entry[ANC_COPYFROM]] |
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307 offset += entry[ANC_COPYFROM] |
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308 |
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309 yield (filename, entry[ANC_NODE], entry[ANC_P1NODE], |
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310 entry[ANC_P2NODE], entry[ANC_LINKNODE], copyfrom) |
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311 |
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312 self._pagedin += PACKENTRYLENGTH |
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313 |
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314 # If we've read a lot of data from the mmap, free some memory. |
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315 self.freememory() |
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316 |
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317 class mutablehistorypack(basepack.mutablebasepack): |
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318 """A class for constructing and serializing a histpack file and index. |
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319 |
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320 A history pack is a pair of files that contain the revision history for |
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321 various file revisions in Mercurial. It contains only revision history (like |
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322 parent pointers and linknodes), not any revision content information. |
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323 |
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324 It consists of two files, with the following format: |
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325 |
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326 .histpack |
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327 The pack itself is a series of file revisions with some basic header |
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328 information on each. |
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329 |
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330 datapack = <version: 1 byte> |
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331 [<filesection>,...] |
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332 filesection = <filename len: 2 byte unsigned int> |
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333 <filename> |
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334 <revision count: 4 byte unsigned int> |
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335 [<revision>,...] |
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336 revision = <node: 20 byte> |
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337 <p1node: 20 byte> |
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338 <p2node: 20 byte> |
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339 <linknode: 20 byte> |
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340 <copyfromlen: 2 byte> |
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341 <copyfrom> |
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342 |
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343 The revisions within each filesection are stored in topological order |
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344 (newest first). If a given entry has a parent from another file (a copy) |
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345 then p1node is the node from the other file, and copyfrom is the |
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346 filepath of the other file. |
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347 |
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348 .histidx |
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349 The index file provides a mapping from filename to the file section in |
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350 the histpack. In V1 it also contains sub-indexes for specific nodes |
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351 within each file. It consists of three parts, the fanout, the file index |
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352 and the node indexes. |
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353 |
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354 The file index is a list of index entries, sorted by filename hash (one |
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355 per file section in the pack). Each entry has: |
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356 |
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357 - node (The 20 byte hash of the filename) |
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358 - pack entry offset (The location of this file section in the histpack) |
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359 - pack content size (The on-disk length of this file section's pack |
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360 data) |
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361 - node index offset (The location of the file's node index in the index |
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362 file) [1] |
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363 - node index size (the on-disk length of this file's node index) [1] |
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364 |
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365 The fanout is a quick lookup table to reduce the number of steps for |
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366 bisecting the index. It is a series of 4 byte pointers to positions |
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367 within the index. It has 2^16 entries, which corresponds to hash |
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368 prefixes [00, 01, 02,..., FD, FE, FF]. Example: the pointer in slot 4F |
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369 points to the index position of the first revision whose node starts |
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370 with 4F. This saves log(2^16) bisect steps. |
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371 |
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372 dataidx = <fanouttable> |
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373 <file count: 8 byte unsigned> [1] |
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374 <fileindex> |
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375 <node count: 8 byte unsigned> [1] |
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376 [<nodeindex>,...] [1] |
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377 fanouttable = [<index offset: 4 byte unsigned int>,...] (2^16 entries) |
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378 |
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379 fileindex = [<file index entry>,...] |
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380 fileindexentry = <node: 20 byte> |
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381 <pack file section offset: 8 byte unsigned int> |
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382 <pack file section size: 8 byte unsigned int> |
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383 <node index offset: 4 byte unsigned int> [1] |
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384 <node index size: 4 byte unsigned int> [1] |
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385 nodeindex = <filename>[<node index entry>,...] [1] |
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386 filename = <filename len : 2 byte unsigned int><filename value> [1] |
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387 nodeindexentry = <node: 20 byte> [1] |
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388 <pack file node offset: 8 byte unsigned int> [1] |
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389 |
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390 [1]: new in version 1. |
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391 """ |
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392 INDEXSUFFIX = INDEXSUFFIX |
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393 PACKSUFFIX = PACKSUFFIX |
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394 |
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395 SUPPORTED_VERSIONS = [2] |
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396 |
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397 def __init__(self, ui, packpath, version=2): |
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398 super(mutablehistorypack, self).__init__(ui, packpath, version=version) |
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399 self.files = {} |
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400 self.entrylocations = {} |
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401 self.fileentries = {} |
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402 |
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403 self.INDEXFORMAT = INDEXFORMAT2 |
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404 self.INDEXENTRYLENGTH = INDEXENTRYLENGTH2 |
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405 |
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406 self.NODEINDEXFORMAT = NODEINDEXFORMAT |
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407 self.NODEINDEXENTRYLENGTH = NODEINDEXENTRYLENGTH |
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408 |
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409 def add(self, filename, node, p1, p2, linknode, copyfrom): |
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410 copyfrom = copyfrom or '' |
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411 copyfromlen = struct.pack('!H', len(copyfrom)) |
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412 self.fileentries.setdefault(filename, []).append((node, p1, p2, |
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413 linknode, |
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414 copyfromlen, |
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415 copyfrom)) |
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416 |
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417 def _write(self): |
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418 for filename in sorted(self.fileentries): |
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419 entries = self.fileentries[filename] |
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420 sectionstart = self.packfp.tell() |
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421 |
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422 # Write the file section content |
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423 entrymap = dict((e[0], e) for e in entries) |
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424 def parentfunc(node): |
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425 x, p1, p2, x, x, x = entrymap[node] |
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426 parents = [] |
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427 if p1 != nullid: |
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428 parents.append(p1) |
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429 if p2 != nullid: |
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430 parents.append(p2) |
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431 return parents |
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432 |
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433 sortednodes = list(reversed(shallowutil.sortnodes( |
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434 (e[0] for e in entries), |
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435 parentfunc))) |
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436 |
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437 # Write the file section header |
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438 self.writeraw("%s%s%s" % ( |
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439 struct.pack('!H', len(filename)), |
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440 filename, |
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441 struct.pack('!I', len(sortednodes)), |
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442 )) |
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443 |
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444 sectionlen = constants.FILENAMESIZE + len(filename) + 4 |
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445 |
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446 rawstrings = [] |
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447 |
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448 # Record the node locations for the index |
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449 locations = self.entrylocations.setdefault(filename, {}) |
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450 offset = sectionstart + sectionlen |
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451 for node in sortednodes: |
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452 locations[node] = offset |
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453 raw = '%s%s%s%s%s%s' % entrymap[node] |
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454 rawstrings.append(raw) |
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455 offset += len(raw) |
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456 |
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457 rawdata = ''.join(rawstrings) |
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458 sectionlen += len(rawdata) |
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459 |
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460 self.writeraw(rawdata) |
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461 |
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462 # Record metadata for the index |
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463 self.files[filename] = (sectionstart, sectionlen) |
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464 node = hashlib.sha1(filename).digest() |
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465 self.entries[node] = node |
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466 |
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467 def close(self, ledger=None): |
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468 if self._closed: |
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469 return |
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470 |
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471 self._write() |
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472 |
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473 return super(mutablehistorypack, self).close(ledger=ledger) |
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474 |
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475 def createindex(self, nodelocations, indexoffset): |
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476 fileindexformat = self.INDEXFORMAT |
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477 fileindexlength = self.INDEXENTRYLENGTH |
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478 nodeindexformat = self.NODEINDEXFORMAT |
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479 nodeindexlength = self.NODEINDEXENTRYLENGTH |
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480 |
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481 files = ((hashlib.sha1(filename).digest(), filename, offset, size) |
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482 for filename, (offset, size) in self.files.iteritems()) |
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483 files = sorted(files) |
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484 |
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485 # node index is after file index size, file index, and node index size |
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486 indexlensize = struct.calcsize('!Q') |
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487 nodeindexoffset = (indexoffset + indexlensize + |
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488 (len(files) * fileindexlength) + indexlensize) |
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489 |
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490 fileindexentries = [] |
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491 nodeindexentries = [] |
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492 nodecount = 0 |
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493 for namehash, filename, offset, size in files: |
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494 # File section index |
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495 nodelocations = self.entrylocations[filename] |
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496 |
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497 nodeindexsize = len(nodelocations) * nodeindexlength |
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498 |
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499 rawentry = struct.pack(fileindexformat, namehash, offset, size, |
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500 nodeindexoffset, nodeindexsize) |
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501 # Node index |
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502 nodeindexentries.append(struct.pack(constants.FILENAMESTRUCT, |
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503 len(filename)) + filename) |
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504 nodeindexoffset += constants.FILENAMESIZE + len(filename) |
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505 |
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506 for node, location in sorted(nodelocations.iteritems()): |
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507 nodeindexentries.append(struct.pack(nodeindexformat, node, |
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508 location)) |
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509 nodecount += 1 |
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510 |
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511 nodeindexoffset += len(nodelocations) * nodeindexlength |
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512 |
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513 fileindexentries.append(rawentry) |
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514 |
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515 nodecountraw = struct.pack('!Q', nodecount) |
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516 return (''.join(fileindexentries) + nodecountraw + |
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517 ''.join(nodeindexentries)) |