Mercurial > hg
annotate hgext/remotefilelog/historypack.py @ 48875:6000f5b25c9b
py2: remove simple from __future__ statements
These were needed for Python 2 support. Now that our linter no longer
mandates these, we can start deleting them.
Differential Revision: https://phab.mercurial-scm.org/D12254
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 03 Mar 2022 17:34:00 +0100 |
parents | d55b71393907 |
children | f254fc73d956 |
rev | line source |
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1 import struct |
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2 |
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3 from mercurial.node import ( |
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4 hex, |
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5 sha1nodeconstants, |
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6 ) |
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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 mercurial.utils import hashutil |
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12 from . import ( |
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13 basepack, |
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14 constants, |
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15 shallowutil, |
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16 ) |
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17 |
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18 # (filename hash, offset, size) |
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19 INDEXFORMAT2 = b'!20sQQII' |
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20 INDEXENTRYLENGTH2 = struct.calcsize(INDEXFORMAT2) |
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21 NODELENGTH = 20 |
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22 |
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23 NODEINDEXFORMAT = b'!20sQ' |
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24 NODEINDEXENTRYLENGTH = struct.calcsize(NODEINDEXFORMAT) |
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25 |
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26 # (node, p1, p2, linknode) |
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27 PACKFORMAT = b"!20s20s20s20sH" |
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28 PACKENTRYLENGTH = 82 |
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29 |
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30 ENTRYCOUNTSIZE = 4 |
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31 |
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32 INDEXSUFFIX = b'.histidx' |
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33 PACKSUFFIX = b'.histpack' |
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34 |
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35 ANC_NODE = 0 |
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36 ANC_P1NODE = 1 |
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37 ANC_P2NODE = 2 |
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38 ANC_LINKNODE = 3 |
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39 ANC_COPYFROM = 4 |
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40 |
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41 |
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42 class historypackstore(basepack.basepackstore): |
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43 INDEXSUFFIX = INDEXSUFFIX |
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44 PACKSUFFIX = PACKSUFFIX |
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45 |
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46 def getpack(self, path): |
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47 return historypack(path) |
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48 |
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49 def getancestors(self, name, node, known=None): |
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50 for pack in self.packs: |
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51 try: |
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52 return pack.getancestors(name, node, known=known) |
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53 except KeyError: |
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54 pass |
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55 |
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56 for pack in self.refresh(): |
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57 try: |
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58 return pack.getancestors(name, node, known=known) |
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59 except KeyError: |
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60 pass |
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61 |
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62 raise KeyError((name, node)) |
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63 |
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64 def getnodeinfo(self, name, node): |
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65 for pack in self.packs: |
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66 try: |
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67 return pack.getnodeinfo(name, node) |
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68 except KeyError: |
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69 pass |
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70 |
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71 for pack in self.refresh(): |
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72 try: |
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73 return pack.getnodeinfo(name, node) |
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74 except KeyError: |
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75 pass |
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76 |
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77 raise KeyError((name, node)) |
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78 |
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79 def add(self, filename, node, p1, p2, linknode, copyfrom): |
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80 raise RuntimeError( |
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81 b"cannot add to historypackstore (%s:%s)" % (filename, hex(node)) |
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82 ) |
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83 |
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84 |
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85 class historypack(basepack.basepack): |
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86 INDEXSUFFIX = INDEXSUFFIX |
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87 PACKSUFFIX = PACKSUFFIX |
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88 |
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89 SUPPORTED_VERSIONS = [2] |
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90 |
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91 def __init__(self, path): |
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92 super(historypack, self).__init__(path) |
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93 self.INDEXFORMAT = INDEXFORMAT2 |
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94 self.INDEXENTRYLENGTH = INDEXENTRYLENGTH2 |
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95 |
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96 def getmissing(self, keys): |
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97 missing = [] |
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98 for name, node in keys: |
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99 try: |
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100 self._findnode(name, node) |
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101 except KeyError: |
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102 missing.append((name, node)) |
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103 |
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104 return missing |
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105 |
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106 def getancestors(self, name, node, known=None): |
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107 """Returns as many ancestors as we're aware of. |
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108 |
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109 return value: { |
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110 node: (p1, p2, linknode, copyfrom), |
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111 ... |
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112 } |
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113 """ |
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114 if known and node in known: |
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115 return [] |
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116 |
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117 ancestors = self._getancestors(name, node, known=known) |
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118 results = {} |
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119 for ancnode, p1, p2, linknode, copyfrom in ancestors: |
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120 results[ancnode] = (p1, p2, linknode, copyfrom) |
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121 |
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122 if not results: |
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123 raise KeyError((name, node)) |
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124 return results |
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125 |
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126 def getnodeinfo(self, name, node): |
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127 # Drop the node from the tuple before returning, since the result should |
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128 # just be (p1, p2, linknode, copyfrom) |
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129 return self._findnode(name, node)[1:] |
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130 |
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131 def _getancestors(self, name, node, known=None): |
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132 if known is None: |
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133 known = set() |
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134 section = self._findsection(name) |
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135 filename, offset, size, nodeindexoffset, nodeindexsize = section |
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136 pending = {node} |
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137 o = 0 |
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138 while o < size: |
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139 if not pending: |
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140 break |
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141 entry, copyfrom = self._readentry(offset + o) |
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142 o += PACKENTRYLENGTH |
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143 if copyfrom: |
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144 o += len(copyfrom) |
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145 |
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146 ancnode = entry[ANC_NODE] |
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147 if ancnode in pending: |
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148 pending.remove(ancnode) |
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149 p1node = entry[ANC_P1NODE] |
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150 p2node = entry[ANC_P2NODE] |
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151 if p1node != sha1nodeconstants.nullid and p1node not in known: |
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152 pending.add(p1node) |
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153 if p2node != sha1nodeconstants.nullid and p2node not in known: |
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154 pending.add(p2node) |
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155 |
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156 yield (ancnode, p1node, p2node, entry[ANC_LINKNODE], copyfrom) |
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157 |
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158 def _readentry(self, offset): |
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159 data = self._data |
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160 entry = struct.unpack( |
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161 PACKFORMAT, data[offset : offset + PACKENTRYLENGTH] |
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162 ) |
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163 copyfrom = None |
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164 copyfromlen = entry[ANC_COPYFROM] |
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165 if copyfromlen != 0: |
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166 offset += PACKENTRYLENGTH |
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167 copyfrom = data[offset : offset + copyfromlen] |
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168 return entry, copyfrom |
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169 |
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170 def add(self, filename, node, p1, p2, linknode, copyfrom): |
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171 raise RuntimeError( |
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172 b"cannot add to historypack (%s:%s)" % (filename, hex(node)) |
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173 ) |
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174 |
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175 def _findnode(self, name, node): |
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176 if self.VERSION == 0: |
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177 ancestors = self._getancestors(name, node) |
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178 for ancnode, p1node, p2node, linknode, copyfrom in ancestors: |
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179 if ancnode == node: |
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180 return (ancnode, p1node, p2node, linknode, copyfrom) |
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181 else: |
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182 section = self._findsection(name) |
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183 nodeindexoffset, nodeindexsize = section[3:] |
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184 entry = self._bisect( |
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185 node, |
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186 nodeindexoffset, |
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187 nodeindexoffset + nodeindexsize, |
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188 NODEINDEXENTRYLENGTH, |
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189 ) |
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190 if entry is not None: |
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191 node, offset = struct.unpack(NODEINDEXFORMAT, entry) |
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192 entry, copyfrom = self._readentry(offset) |
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193 # Drop the copyfromlen from the end of entry, and replace it |
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194 # with the copyfrom string. |
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195 return entry[:4] + (copyfrom,) |
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196 |
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197 raise KeyError(b"unable to find history for %s:%s" % (name, hex(node))) |
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198 |
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199 def _findsection(self, name): |
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200 params = self.params |
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201 namehash = hashutil.sha1(name).digest() |
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202 fanoutkey = struct.unpack( |
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203 params.fanoutstruct, namehash[: params.fanoutprefix] |
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204 )[0] |
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205 fanout = self._fanouttable |
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206 |
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207 start = fanout[fanoutkey] + params.indexstart |
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208 indexend = self._indexend |
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209 |
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210 for i in pycompat.xrange(fanoutkey + 1, params.fanoutcount): |
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211 end = fanout[i] + params.indexstart |
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212 if end != start: |
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213 break |
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214 else: |
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215 end = indexend |
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216 |
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217 entry = self._bisect(namehash, start, end, self.INDEXENTRYLENGTH) |
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218 if not entry: |
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219 raise KeyError(name) |
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220 |
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221 rawentry = struct.unpack(self.INDEXFORMAT, entry) |
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222 x, offset, size, nodeindexoffset, nodeindexsize = rawentry |
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223 rawnamelen = self._index[ |
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224 nodeindexoffset : nodeindexoffset + constants.FILENAMESIZE |
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225 ] |
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226 actualnamelen = struct.unpack(b'!H', rawnamelen)[0] |
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227 nodeindexoffset += constants.FILENAMESIZE |
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228 actualname = self._index[ |
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229 nodeindexoffset : nodeindexoffset + actualnamelen |
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230 ] |
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231 if actualname != name: |
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232 raise KeyError( |
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233 b"found file name %s when looking for %s" % (actualname, name) |
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234 ) |
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235 nodeindexoffset += actualnamelen |
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236 |
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237 filenamelength = struct.unpack( |
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238 b'!H', self._data[offset : offset + constants.FILENAMESIZE] |
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239 )[0] |
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240 offset += constants.FILENAMESIZE |
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241 |
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242 actualname = self._data[offset : offset + filenamelength] |
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243 offset += filenamelength |
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244 |
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245 if name != actualname: |
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246 raise KeyError( |
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247 b"found file name %s when looking for %s" % (actualname, name) |
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248 ) |
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249 |
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250 # Skip entry list size |
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251 offset += ENTRYCOUNTSIZE |
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252 |
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253 nodelistoffset = offset |
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254 nodelistsize = ( |
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255 size - constants.FILENAMESIZE - filenamelength - ENTRYCOUNTSIZE |
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256 ) |
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257 return ( |
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258 name, |
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259 nodelistoffset, |
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260 nodelistsize, |
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261 nodeindexoffset, |
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262 nodeindexsize, |
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263 ) |
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264 |
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265 def _bisect(self, node, start, end, entrylen): |
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266 # Bisect between start and end to find node |
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267 origstart = start |
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268 startnode = self._index[start : start + NODELENGTH] |
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269 endnode = self._index[end : end + NODELENGTH] |
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270 |
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271 if startnode == node: |
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272 return self._index[start : start + entrylen] |
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273 elif endnode == node: |
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274 return self._index[end : end + entrylen] |
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275 else: |
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276 while start < end - entrylen: |
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277 mid = start + (end - start) // 2 |
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278 mid = mid - ((mid - origstart) % entrylen) |
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279 midnode = self._index[mid : mid + NODELENGTH] |
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280 if midnode == node: |
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281 return self._index[mid : mid + entrylen] |
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282 if node > midnode: |
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283 start = mid |
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284 elif node < midnode: |
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285 end = mid |
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286 return None |
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287 |
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288 def markledger(self, ledger, options=None): |
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289 for filename, node in self: |
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290 ledger.markhistoryentry(self, filename, node) |
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291 |
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292 def cleanup(self, ledger): |
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293 entries = ledger.sources.get(self, []) |
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294 allkeys = set(self) |
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295 repackedkeys = { |
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296 (e.filename, e.node) for e in entries if e.historyrepacked |
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297 } |
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298 |
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299 if len(allkeys - repackedkeys) == 0: |
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300 if self.path not in ledger.created: |
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301 util.unlinkpath(self.indexpath, ignoremissing=True) |
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302 util.unlinkpath(self.packpath, ignoremissing=True) |
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303 |
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304 def __iter__(self): |
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305 for f, n, x, x, x, x in self.iterentries(): |
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306 yield f, n |
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307 |
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308 def iterentries(self): |
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309 # Start at 1 to skip the header |
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310 offset = 1 |
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311 while offset < self.datasize: |
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312 data = self._data |
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313 # <2 byte len> + <filename> |
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314 filenamelen = struct.unpack( |
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315 b'!H', data[offset : offset + constants.FILENAMESIZE] |
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316 )[0] |
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317 offset += constants.FILENAMESIZE |
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318 filename = data[offset : offset + filenamelen] |
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319 offset += filenamelen |
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320 |
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321 revcount = struct.unpack( |
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322 b'!I', data[offset : offset + ENTRYCOUNTSIZE] |
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323 )[0] |
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324 offset += ENTRYCOUNTSIZE |
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325 |
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326 for i in pycompat.xrange(revcount): |
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327 entry = struct.unpack( |
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328 PACKFORMAT, data[offset : offset + PACKENTRYLENGTH] |
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329 ) |
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330 offset += PACKENTRYLENGTH |
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331 |
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332 copyfrom = data[offset : offset + entry[ANC_COPYFROM]] |
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333 offset += entry[ANC_COPYFROM] |
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334 |
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335 yield ( |
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336 filename, |
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337 entry[ANC_NODE], |
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338 entry[ANC_P1NODE], |
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339 entry[ANC_P2NODE], |
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340 entry[ANC_LINKNODE], |
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341 copyfrom, |
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342 ) |
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343 |
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344 self._pagedin += PACKENTRYLENGTH |
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345 |
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346 # If we've read a lot of data from the mmap, free some memory. |
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347 self.freememory() |
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348 |
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349 |
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350 class mutablehistorypack(basepack.mutablebasepack): |
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351 """A class for constructing and serializing a histpack file and index. |
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352 |
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353 A history pack is a pair of files that contain the revision history for |
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354 various file revisions in Mercurial. It contains only revision history (like |
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355 parent pointers and linknodes), not any revision content information. |
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356 |
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357 It consists of two files, with the following format: |
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358 |
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359 .histpack |
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360 The pack itself is a series of file revisions with some basic header |
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361 information on each. |
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362 |
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363 datapack = <version: 1 byte> |
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364 [<filesection>,...] |
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365 filesection = <filename len: 2 byte unsigned int> |
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366 <filename> |
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367 <revision count: 4 byte unsigned int> |
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368 [<revision>,...] |
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369 revision = <node: 20 byte> |
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370 <p1node: 20 byte> |
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371 <p2node: 20 byte> |
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372 <linknode: 20 byte> |
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373 <copyfromlen: 2 byte> |
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374 <copyfrom> |
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375 |
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376 The revisions within each filesection are stored in topological order |
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377 (newest first). If a given entry has a parent from another file (a copy) |
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378 then p1node is the node from the other file, and copyfrom is the |
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379 filepath of the other file. |
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380 |
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381 .histidx |
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382 The index file provides a mapping from filename to the file section in |
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383 the histpack. In V1 it also contains sub-indexes for specific nodes |
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384 within each file. It consists of three parts, the fanout, the file index |
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385 and the node indexes. |
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386 |
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387 The file index is a list of index entries, sorted by filename hash (one |
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388 per file section in the pack). Each entry has: |
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389 |
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390 - node (The 20 byte hash of the filename) |
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391 - pack entry offset (The location of this file section in the histpack) |
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392 - pack content size (The on-disk length of this file section's pack |
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393 data) |
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394 - node index offset (The location of the file's node index in the index |
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395 file) [1] |
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396 - node index size (the on-disk length of this file's node index) [1] |
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397 |
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398 The fanout is a quick lookup table to reduce the number of steps for |
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399 bisecting the index. It is a series of 4 byte pointers to positions |
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400 within the index. It has 2^16 entries, which corresponds to hash |
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401 prefixes [00, 01, 02,..., FD, FE, FF]. Example: the pointer in slot 4F |
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402 points to the index position of the first revision whose node starts |
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403 with 4F. This saves log(2^16) bisect steps. |
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404 |
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405 dataidx = <fanouttable> |
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406 <file count: 8 byte unsigned> [1] |
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407 <fileindex> |
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408 <node count: 8 byte unsigned> [1] |
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409 [<nodeindex>,...] [1] |
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410 fanouttable = [<index offset: 4 byte unsigned int>,...] (2^16 entries) |
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411 |
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412 fileindex = [<file index entry>,...] |
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413 fileindexentry = <node: 20 byte> |
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414 <pack file section offset: 8 byte unsigned int> |
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415 <pack file section size: 8 byte unsigned int> |
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416 <node index offset: 4 byte unsigned int> [1] |
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417 <node index size: 4 byte unsigned int> [1] |
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418 nodeindex = <filename>[<node index entry>,...] [1] |
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419 filename = <filename len : 2 byte unsigned int><filename value> [1] |
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420 nodeindexentry = <node: 20 byte> [1] |
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421 <pack file node offset: 8 byte unsigned int> [1] |
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422 |
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423 [1]: new in version 1. |
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424 """ |
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425 |
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426 INDEXSUFFIX = INDEXSUFFIX |
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427 PACKSUFFIX = PACKSUFFIX |
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428 |
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429 SUPPORTED_VERSIONS = [2] |
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430 |
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431 def __init__(self, ui, packpath, version=2): |
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432 super(mutablehistorypack, self).__init__(ui, packpath, version=version) |
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433 self.files = {} |
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434 self.entrylocations = {} |
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435 self.fileentries = {} |
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436 |
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437 self.INDEXFORMAT = INDEXFORMAT2 |
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438 self.INDEXENTRYLENGTH = INDEXENTRYLENGTH2 |
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439 |
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440 self.NODEINDEXFORMAT = NODEINDEXFORMAT |
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441 self.NODEINDEXENTRYLENGTH = NODEINDEXENTRYLENGTH |
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442 |
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443 def add(self, filename, node, p1, p2, linknode, copyfrom): |
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444 copyfrom = copyfrom or b'' |
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445 copyfromlen = struct.pack(b'!H', len(copyfrom)) |
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446 self.fileentries.setdefault(filename, []).append( |
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447 (node, p1, p2, linknode, copyfromlen, copyfrom) |
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448 ) |
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449 |
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450 def _write(self): |
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451 for filename in sorted(self.fileentries): |
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452 entries = self.fileentries[filename] |
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453 sectionstart = self.packfp.tell() |
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454 |
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455 # Write the file section content |
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456 entrymap = {e[0]: e for e in entries} |
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457 |
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458 def parentfunc(node): |
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459 x, p1, p2, x, x, x = entrymap[node] |
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460 parents = [] |
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461 if p1 != sha1nodeconstants.nullid: |
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462 parents.append(p1) |
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463 if p2 != sha1nodeconstants.nullid: |
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464 parents.append(p2) |
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465 return parents |
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466 |
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467 sortednodes = list( |
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468 reversed( |
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469 shallowutil.sortnodes((e[0] for e in entries), parentfunc) |
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470 ) |
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471 ) |
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472 |
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473 # Write the file section header |
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474 self.writeraw( |
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475 b"%s%s%s" |
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476 % ( |
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477 struct.pack(b'!H', len(filename)), |
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478 filename, |
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479 struct.pack(b'!I', len(sortednodes)), |
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480 ) |
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481 ) |
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482 |
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483 sectionlen = constants.FILENAMESIZE + len(filename) + 4 |
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484 |
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485 rawstrings = [] |
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486 |
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487 # Record the node locations for the index |
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488 locations = self.entrylocations.setdefault(filename, {}) |
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489 offset = sectionstart + sectionlen |
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490 for node in sortednodes: |
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491 locations[node] = offset |
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492 raw = b'%s%s%s%s%s%s' % entrymap[node] |
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493 rawstrings.append(raw) |
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494 offset += len(raw) |
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495 |
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496 rawdata = b''.join(rawstrings) |
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497 sectionlen += len(rawdata) |
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498 |
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499 self.writeraw(rawdata) |
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500 |
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501 # Record metadata for the index |
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502 self.files[filename] = (sectionstart, sectionlen) |
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503 node = hashutil.sha1(filename).digest() |
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504 self.entries[node] = node |
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505 |
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506 def close(self, ledger=None): |
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507 if self._closed: |
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508 return |
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509 |
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510 self._write() |
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511 |
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512 return super(mutablehistorypack, self).close(ledger=ledger) |
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513 |
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514 def createindex(self, nodelocations, indexoffset): |
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515 fileindexformat = self.INDEXFORMAT |
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516 fileindexlength = self.INDEXENTRYLENGTH |
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517 nodeindexformat = self.NODEINDEXFORMAT |
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518 nodeindexlength = self.NODEINDEXENTRYLENGTH |
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519 |
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520 files = ( |
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521 (hashutil.sha1(filename).digest(), filename, offset, size) |
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522 for filename, (offset, size) in pycompat.iteritems(self.files) |
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523 ) |
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524 files = sorted(files) |
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525 |
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526 # node index is after file index size, file index, and node index size |
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527 indexlensize = struct.calcsize(b'!Q') |
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528 nodeindexoffset = ( |
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529 indexoffset |
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530 + indexlensize |
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531 + (len(files) * fileindexlength) |
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532 + indexlensize |
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533 ) |
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534 |
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535 fileindexentries = [] |
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536 nodeindexentries = [] |
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537 nodecount = 0 |
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538 for namehash, filename, offset, size in files: |
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539 # File section index |
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540 nodelocations = self.entrylocations[filename] |
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541 |
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542 nodeindexsize = len(nodelocations) * nodeindexlength |
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543 |
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544 rawentry = struct.pack( |
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545 fileindexformat, |
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546 namehash, |
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547 offset, |
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548 size, |
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549 nodeindexoffset, |
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550 nodeindexsize, |
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551 ) |
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552 # Node index |
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553 nodeindexentries.append( |
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554 struct.pack(constants.FILENAMESTRUCT, len(filename)) + filename |
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555 ) |
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556 nodeindexoffset += constants.FILENAMESIZE + len(filename) |
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557 |
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Gregory Szorc <gregory.szorc@gmail.com>
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558 for node, location in sorted(pycompat.iteritems(nodelocations)): |
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formatting: blacken the codebase
Augie Fackler <augie@google.com>
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559 nodeindexentries.append( |
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Augie Fackler <augie@google.com>
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560 struct.pack(nodeindexformat, node, location) |
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Augie Fackler <augie@google.com>
parents:
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561 ) |
40506
10c10da14c5d
remotefilelog: bump pack file formats to version 2
Augie Fackler <augie@google.com>
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562 nodecount += 1 |
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3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
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563 |
40506
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remotefilelog: bump pack file formats to version 2
Augie Fackler <augie@google.com>
parents:
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564 nodeindexoffset += len(nodelocations) * nodeindexlength |
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remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
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changeset
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565 |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
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566 fileindexentries.append(rawentry) |
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remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
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567 |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
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568 nodecountraw = struct.pack(b'!Q', nodecount) |
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Augie Fackler <augie@google.com>
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569 return ( |
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Augie Fackler <augie@google.com>
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570 b''.join(fileindexentries) |
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Augie Fackler <augie@google.com>
parents:
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571 + nodecountraw |
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Augie Fackler <augie@google.com>
parents:
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572 + b''.join(nodeindexentries) |
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Augie Fackler <augie@google.com>
parents:
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573 ) |