Mercurial > hg
annotate mercurial/pure/parsers.py @ 47256:2b69555e4875
revlog: introduce a compression mode for sidedata in the revlog index
We will use this for compression for the sidedata payload.
Differential Revision: https://phab.mercurial-scm.org/D10653
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 03 May 2021 21:34:02 +0200 |
parents | 6bfa6c2c5f15 |
children | 07641bafa646 |
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1 # parsers.py - Python implementation of parsers.c |
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2 # |
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3 # Copyright 2009 Olivia Mackall <olivia@selenic.com> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import struct |
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11 import zlib |
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12 |
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13 from ..node import ( |
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14 nullrev, |
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15 sha1nodeconstants, |
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16 ) |
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17 from .. import ( |
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18 error, |
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19 pycompat, |
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20 util, |
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21 ) |
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22 |
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23 from ..revlogutils import nodemap as nodemaputil |
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24 from ..revlogutils import constants as revlog_constants |
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25 |
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26 stringio = pycompat.bytesio |
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27 |
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28 |
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29 _pack = struct.pack |
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30 _unpack = struct.unpack |
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31 _compress = zlib.compress |
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32 _decompress = zlib.decompress |
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33 |
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34 # Some code below makes tuples directly because it's more convenient. However, |
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35 # code outside this module should always use dirstatetuple. |
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36 def dirstatetuple(*x): |
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37 # x is a tuple |
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38 return x |
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39 |
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40 |
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41 def gettype(q): |
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42 return int(q & 0xFFFF) |
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43 |
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44 |
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45 def offset_type(offset, type): |
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46 return int(int(offset) << 16 | type) |
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47 |
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48 |
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49 class BaseIndexObject(object): |
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50 # Format of an index entry according to Python's `struct` language |
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51 index_format = revlog_constants.INDEX_ENTRY_V1 |
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52 # Size of a C unsigned long long int, platform independent |
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53 big_int_size = struct.calcsize(b'>Q') |
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54 # Size of a C long int, platform independent |
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55 int_size = struct.calcsize(b'>i') |
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56 # An empty index entry, used as a default value to be overridden, or nullrev |
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57 null_item = ( |
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58 0, |
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59 0, |
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60 0, |
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61 -1, |
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62 -1, |
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63 -1, |
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64 -1, |
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65 sha1nodeconstants.nullid, |
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66 0, |
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67 0, |
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68 revlog_constants.COMP_MODE_INLINE, |
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69 revlog_constants.COMP_MODE_INLINE, |
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70 ) |
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71 |
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72 @util.propertycache |
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73 def entry_size(self): |
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74 return self.index_format.size |
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75 |
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76 @property |
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77 def nodemap(self): |
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78 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]" |
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79 util.nouideprecwarn(msg, b'5.3', stacklevel=2) |
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80 return self._nodemap |
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81 |
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82 @util.propertycache |
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83 def _nodemap(self): |
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84 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: nullrev}) |
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85 for r in range(0, len(self)): |
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86 n = self[r][7] |
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87 nodemap[n] = r |
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88 return nodemap |
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89 |
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90 def has_node(self, node): |
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91 """return True if the node exist in the index""" |
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92 return node in self._nodemap |
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93 |
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94 def rev(self, node): |
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95 """return a revision for a node |
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96 |
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97 If the node is unknown, raise a RevlogError""" |
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98 return self._nodemap[node] |
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99 |
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100 def get_rev(self, node): |
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101 """return a revision for a node |
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102 |
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103 If the node is unknown, return None""" |
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104 return self._nodemap.get(node) |
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105 |
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106 def _stripnodes(self, start): |
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107 if '_nodemap' in vars(self): |
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108 for r in range(start, len(self)): |
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109 n = self[r][7] |
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110 del self._nodemap[n] |
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111 |
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112 def clearcaches(self): |
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113 self.__dict__.pop('_nodemap', None) |
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114 |
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115 def __len__(self): |
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116 return self._lgt + len(self._extra) |
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117 |
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118 def append(self, tup): |
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119 if '_nodemap' in vars(self): |
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120 self._nodemap[tup[7]] = len(self) |
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121 data = self._pack_entry(tup) |
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122 self._extra.append(data) |
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123 |
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124 def _pack_entry(self, entry): |
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125 assert entry[8] == 0 |
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126 assert entry[9] == 0 |
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127 return self.index_format.pack(*entry[:8]) |
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128 |
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129 def _check_index(self, i): |
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130 if not isinstance(i, int): |
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131 raise TypeError(b"expecting int indexes") |
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132 if i < 0 or i >= len(self): |
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133 raise IndexError |
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134 |
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135 def __getitem__(self, i): |
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136 if i == -1: |
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137 return self.null_item |
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138 self._check_index(i) |
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139 if i >= self._lgt: |
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140 data = self._extra[i - self._lgt] |
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141 else: |
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142 index = self._calculate_index(i) |
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143 data = self._data[index : index + self.entry_size] |
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144 r = self._unpack_entry(data) |
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145 if self._lgt and i == 0: |
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146 r = (offset_type(0, gettype(r[0])),) + r[1:] |
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147 return r |
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148 |
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149 def _unpack_entry(self, data): |
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150 r = self.index_format.unpack(data) |
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151 r = r + ( |
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152 0, |
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153 0, |
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154 revlog_constants.COMP_MODE_INLINE, |
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155 revlog_constants.COMP_MODE_INLINE, |
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156 ) |
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157 return r |
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158 |
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159 def pack_header(self, header): |
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160 """pack header information as binary""" |
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161 v_fmt = revlog_constants.INDEX_HEADER |
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162 return v_fmt.pack(header) |
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163 |
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164 def entry_binary(self, rev): |
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165 """return the raw binary string representing a revision""" |
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166 entry = self[rev] |
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167 p = revlog_constants.INDEX_ENTRY_V1.pack(*entry[:8]) |
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168 if rev == 0: |
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169 p = p[revlog_constants.INDEX_HEADER.size :] |
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170 return p |
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171 |
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172 |
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173 class IndexObject(BaseIndexObject): |
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174 def __init__(self, data): |
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175 assert len(data) % self.entry_size == 0, ( |
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176 len(data), |
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177 self.entry_size, |
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178 len(data) % self.entry_size, |
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179 ) |
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180 self._data = data |
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181 self._lgt = len(data) // self.entry_size |
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182 self._extra = [] |
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183 |
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184 def _calculate_index(self, i): |
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185 return i * self.entry_size |
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187 def __delitem__(self, i): |
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188 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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189 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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190 i = i.start |
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191 self._check_index(i) |
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192 self._stripnodes(i) |
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193 if i < self._lgt: |
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194 self._data = self._data[: i * self.entry_size] |
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195 self._lgt = i |
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196 self._extra = [] |
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197 else: |
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198 self._extra = self._extra[: i - self._lgt] |
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199 |
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200 |
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201 class PersistentNodeMapIndexObject(IndexObject): |
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202 """a Debug oriented class to test persistent nodemap |
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203 |
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204 We need a simple python object to test API and higher level behavior. See |
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205 the Rust implementation for more serious usage. This should be used only |
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206 through the dedicated `devel.persistent-nodemap` config. |
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207 """ |
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208 |
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209 def nodemap_data_all(self): |
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210 """Return bytes containing a full serialization of a nodemap |
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211 |
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212 The nodemap should be valid for the full set of revisions in the |
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213 index.""" |
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214 return nodemaputil.persistent_data(self) |
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215 |
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216 def nodemap_data_incremental(self): |
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217 """Return bytes containing a incremental update to persistent nodemap |
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218 |
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219 This containst the data for an append-only update of the data provided |
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220 in the last call to `update_nodemap_data`. |
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221 """ |
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222 if self._nm_root is None: |
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223 return None |
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224 docket = self._nm_docket |
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225 changed, data = nodemaputil.update_persistent_data( |
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226 self, self._nm_root, self._nm_max_idx, self._nm_docket.tip_rev |
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227 ) |
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228 |
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229 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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230 return docket, changed, data |
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231 |
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232 def update_nodemap_data(self, docket, nm_data): |
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233 """provide full block of persisted binary data for a nodemap |
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234 |
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235 The data are expected to come from disk. See `nodemap_data_all` for a |
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236 produceur of such data.""" |
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237 if nm_data is not None: |
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238 self._nm_root, self._nm_max_idx = nodemaputil.parse_data(nm_data) |
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239 if self._nm_root: |
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240 self._nm_docket = docket |
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241 else: |
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242 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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243 |
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244 |
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245 class InlinedIndexObject(BaseIndexObject): |
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246 def __init__(self, data, inline=0): |
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247 self._data = data |
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248 self._lgt = self._inline_scan(None) |
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249 self._inline_scan(self._lgt) |
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250 self._extra = [] |
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251 |
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252 def _inline_scan(self, lgt): |
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253 off = 0 |
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254 if lgt is not None: |
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255 self._offsets = [0] * lgt |
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256 count = 0 |
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257 while off <= len(self._data) - self.entry_size: |
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258 start = off + self.big_int_size |
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259 (s,) = struct.unpack( |
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260 b'>i', |
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261 self._data[start : start + self.int_size], |
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262 ) |
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263 if lgt is not None: |
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264 self._offsets[count] = off |
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265 count += 1 |
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266 off += self.entry_size + s |
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267 if off != len(self._data): |
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268 raise ValueError(b"corrupted data") |
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269 return count |
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270 |
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271 def __delitem__(self, i): |
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272 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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273 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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274 i = i.start |
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275 self._check_index(i) |
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276 self._stripnodes(i) |
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277 if i < self._lgt: |
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278 self._offsets = self._offsets[:i] |
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279 self._lgt = i |
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280 self._extra = [] |
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281 else: |
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282 self._extra = self._extra[: i - self._lgt] |
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283 |
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284 def _calculate_index(self, i): |
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285 return self._offsets[i] |
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286 |
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287 |
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288 def parse_index2(data, inline, revlogv2=False): |
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289 if not inline: |
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290 cls = IndexObject2 if revlogv2 else IndexObject |
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291 return cls(data), None |
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292 cls = InlinedIndexObject2 if revlogv2 else InlinedIndexObject |
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293 return cls(data, inline), (0, data) |
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294 |
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295 |
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296 class Index2Mixin(object): |
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297 index_format = revlog_constants.INDEX_ENTRY_V2 |
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298 |
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299 def replace_sidedata_info( |
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300 self, rev, sidedata_offset, sidedata_length, offset_flags |
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301 ): |
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302 """ |
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303 Replace an existing index entry's sidedata offset and length with new |
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304 ones. |
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305 This cannot be used outside of the context of sidedata rewriting, |
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306 inside the transaction that creates the revision `rev`. |
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307 """ |
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308 if rev < 0: |
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309 raise KeyError |
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310 self._check_index(rev) |
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311 if rev < self._lgt: |
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312 msg = b"cannot rewrite entries outside of this transaction" |
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313 raise KeyError(msg) |
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314 else: |
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315 entry = list(self[rev]) |
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316 entry[0] = offset_flags |
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317 entry[8] = sidedata_offset |
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318 entry[9] = sidedata_length |
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319 entry = tuple(entry) |
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320 new = self._pack_entry(entry) |
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321 self._extra[rev - self._lgt] = new |
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322 |
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323 def _unpack_entry(self, data): |
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324 data = self.index_format.unpack(data) |
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325 entry = data[:10] |
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326 data_comp = data[10] & 3 |
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327 sidedata_comp = (data[10] & (3 << 2)) >> 2 |
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328 return entry + (data_comp, sidedata_comp) |
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329 |
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330 def _pack_entry(self, entry): |
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331 data = entry[:10] |
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332 data_comp = entry[10] & 3 |
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333 sidedata_comp = (entry[11] & 3) << 2 |
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334 data += (data_comp | sidedata_comp,) |
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335 |
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336 return self.index_format.pack(*data) |
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337 |
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338 def entry_binary(self, rev): |
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339 """return the raw binary string representing a revision""" |
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340 entry = self[rev] |
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341 return self._pack_entry(entry) |
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342 |
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343 def pack_header(self, header): |
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344 """pack header information as binary""" |
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345 msg = 'version header should go in the docket, not the index: %d' |
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346 msg %= header |
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347 raise error.ProgrammingError(msg) |
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348 |
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349 |
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350 class IndexObject2(Index2Mixin, IndexObject): |
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351 pass |
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352 |
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353 |
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354 class InlinedIndexObject2(Index2Mixin, InlinedIndexObject): |
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355 def _inline_scan(self, lgt): |
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356 sidedata_length_pos = 72 |
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357 off = 0 |
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358 if lgt is not None: |
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359 self._offsets = [0] * lgt |
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360 count = 0 |
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361 while off <= len(self._data) - self.entry_size: |
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362 start = off + self.big_int_size |
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363 (data_size,) = struct.unpack( |
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364 b'>i', |
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365 self._data[start : start + self.int_size], |
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366 ) |
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367 start = off + sidedata_length_pos |
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368 (side_data_size,) = struct.unpack( |
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369 b'>i', self._data[start : start + self.int_size] |
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370 ) |
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371 if lgt is not None: |
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372 self._offsets[count] = off |
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373 count += 1 |
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374 off += self.entry_size + data_size + side_data_size |
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375 if off != len(self._data): |
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376 raise ValueError(b"corrupted data") |
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377 return count |
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378 |
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379 |
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380 def parse_index_devel_nodemap(data, inline): |
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381 """like parse_index2, but alway return a PersistentNodeMapIndexObject""" |
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382 return PersistentNodeMapIndexObject(data), None |
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383 |
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384 |
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385 def parse_dirstate(dmap, copymap, st): |
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386 parents = [st[:20], st[20:40]] |
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387 # dereference fields so they will be local in loop |
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388 format = b">cllll" |
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389 e_size = struct.calcsize(format) |
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390 pos1 = 40 |
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391 l = len(st) |
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392 |
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393 # the inner loop |
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394 while pos1 < l: |
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395 pos2 = pos1 + e_size |
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396 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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397 pos1 = pos2 + e[4] |
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398 f = st[pos2:pos1] |
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399 if b'\0' in f: |
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400 f, c = f.split(b'\0') |
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401 copymap[f] = c |
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402 dmap[f] = e[:4] |
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403 return parents |
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404 |
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405 |
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406 def pack_dirstate(dmap, copymap, pl, now): |
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407 now = int(now) |
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408 cs = stringio() |
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409 write = cs.write |
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410 write(b"".join(pl)) |
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411 for f, e in pycompat.iteritems(dmap): |
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412 if e[0] == b'n' and e[3] == now: |
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413 # The file was last modified "simultaneously" with the current |
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414 # write to dirstate (i.e. within the same second for file- |
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415 # systems with a granularity of 1 sec). This commonly happens |
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416 # for at least a couple of files on 'update'. |
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417 # The user could change the file without changing its size |
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418 # within the same second. Invalidate the file's mtime in |
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419 # dirstate, forcing future 'status' calls to compare the |
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420 # contents of the file if the size is the same. This prevents |
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421 # mistakenly treating such files as clean. |
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422 e = dirstatetuple(e[0], e[1], e[2], -1) |
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423 dmap[f] = e |
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424 |
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425 if f in copymap: |
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426 f = b"%s\0%s" % (f, copymap[f]) |
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427 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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428 write(e) |
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429 write(f) |
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430 return cs.getvalue() |