Mercurial > hg
annotate mercurial/pure/parsers.py @ 44320:671f9479af0e
nodemap: provide the on disk data to indexes who support it
Time to start defining the API and prepare the rust index support. We provide
a method to do so. We use a distinct method instead of passing them in the
constructor because we will need this method anyway later (to refresh the mmap
once we update the data on disk).
Differential Revision: https://phab.mercurial-scm.org/D7847
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 15 Jan 2020 15:49:16 +0100 |
parents | 7f4f7ef3133e |
children | 50ad851efd9b |
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1 # parsers.py - Python implementation of parsers.c |
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2 # |
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3 # Copyright 2009 Matt Mackall <mpm@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 nullid, nullrev |
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14 from .. import ( |
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15 pycompat, |
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16 util, |
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17 ) |
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18 |
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19 from ..revlogutils import nodemap as nodemaputil |
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20 |
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21 stringio = pycompat.bytesio |
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22 |
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23 |
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24 _pack = struct.pack |
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25 _unpack = struct.unpack |
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26 _compress = zlib.compress |
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27 _decompress = zlib.decompress |
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28 |
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29 # Some code below makes tuples directly because it's more convenient. However, |
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30 # code outside this module should always use dirstatetuple. |
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31 def dirstatetuple(*x): |
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32 # x is a tuple |
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33 return x |
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34 |
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35 |
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36 indexformatng = b">Qiiiiii20s12x" |
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37 indexfirst = struct.calcsize(b'Q') |
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38 sizeint = struct.calcsize(b'i') |
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39 indexsize = struct.calcsize(indexformatng) |
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40 |
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41 |
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42 def gettype(q): |
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43 return int(q & 0xFFFF) |
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44 |
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45 |
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46 def offset_type(offset, type): |
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47 return int(int(offset) << 16 | type) |
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48 |
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49 |
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50 class BaseIndexObject(object): |
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51 @property |
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52 def nodemap(self): |
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53 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]" |
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54 util.nouideprecwarn(msg, b'5.3', stacklevel=2) |
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55 return self._nodemap |
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56 |
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57 @util.propertycache |
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58 def _nodemap(self): |
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59 nodemap = nodemaputil.NodeMap({nullid: nullrev}) |
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60 for r in range(0, len(self)): |
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61 n = self[r][7] |
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62 nodemap[n] = r |
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63 return nodemap |
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64 |
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65 def has_node(self, node): |
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66 """return True if the node exist in the index""" |
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67 return node in self._nodemap |
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68 |
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69 def rev(self, node): |
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70 """return a revision for a node |
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71 |
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72 If the node is unknown, raise a RevlogError""" |
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73 return self._nodemap[node] |
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74 |
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75 def get_rev(self, node): |
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76 """return a revision for a node |
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77 |
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78 If the node is unknown, return None""" |
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79 return self._nodemap.get(node) |
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80 |
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81 def _stripnodes(self, start): |
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82 if '_nodemap' in vars(self): |
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83 for r in range(start, len(self)): |
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84 n = self[r][7] |
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85 del self._nodemap[n] |
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86 |
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87 def clearcaches(self): |
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88 self.__dict__.pop('_nodemap', None) |
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89 |
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90 def __len__(self): |
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91 return self._lgt + len(self._extra) |
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92 |
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93 def append(self, tup): |
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94 if '_nodemap' in vars(self): |
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95 self._nodemap[tup[7]] = len(self) |
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96 self._extra.append(tup) |
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97 |
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98 def _check_index(self, i): |
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99 if not isinstance(i, int): |
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100 raise TypeError(b"expecting int indexes") |
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101 if i < 0 or i >= len(self): |
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102 raise IndexError |
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103 |
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104 def __getitem__(self, i): |
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105 if i == -1: |
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106 return (0, 0, 0, -1, -1, -1, -1, nullid) |
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107 self._check_index(i) |
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108 if i >= self._lgt: |
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109 return self._extra[i - self._lgt] |
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110 index = self._calculate_index(i) |
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111 r = struct.unpack(indexformatng, self._data[index : index + indexsize]) |
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112 if i == 0: |
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113 e = list(r) |
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114 type = gettype(e[0]) |
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115 e[0] = offset_type(0, type) |
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116 return tuple(e) |
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117 return r |
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118 |
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119 |
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120 class IndexObject(BaseIndexObject): |
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121 def __init__(self, data): |
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122 assert len(data) % indexsize == 0 |
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123 self._data = data |
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124 self._lgt = len(data) // indexsize |
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125 self._extra = [] |
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126 |
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127 def _calculate_index(self, i): |
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128 return i * indexsize |
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130 def __delitem__(self, i): |
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131 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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132 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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133 i = i.start |
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134 self._check_index(i) |
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135 self._stripnodes(i) |
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136 if i < self._lgt: |
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137 self._data = self._data[: i * indexsize] |
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138 self._lgt = i |
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139 self._extra = [] |
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140 else: |
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141 self._extra = self._extra[: i - self._lgt] |
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142 |
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143 |
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144 class PersistentNodeMapIndexObject(IndexObject): |
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145 """a Debug oriented class to test persistent nodemap |
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146 |
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147 We need a simple python object to test API and higher level behavior. See |
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148 the Rust implementation for more serious usage. This should be used only |
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149 through the dedicated `devel.persistent-nodemap` config. |
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150 """ |
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151 |
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152 def nodemap_data_all(self): |
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153 """Return bytes containing a full serialization of a nodemap |
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154 |
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155 The nodemap should be valid for the full set of revisions in the |
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156 index.""" |
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157 return nodemaputil.persistent_data(self) |
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158 |
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159 def update_nodemap_data(self, nm_data): |
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160 """provide full blokc of persisted binary data for a nodemap |
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161 |
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162 The data are expected to come from disk. See `nodemap_data_all` for a |
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163 produceur of such data.""" |
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164 if nm_data is not None: |
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165 nodemaputil.parse_data(nm_data) |
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166 |
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167 |
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168 class InlinedIndexObject(BaseIndexObject): |
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169 def __init__(self, data, inline=0): |
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170 self._data = data |
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171 self._lgt = self._inline_scan(None) |
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172 self._inline_scan(self._lgt) |
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173 self._extra = [] |
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174 |
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175 def _inline_scan(self, lgt): |
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176 off = 0 |
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177 if lgt is not None: |
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178 self._offsets = [0] * lgt |
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179 count = 0 |
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180 while off <= len(self._data) - indexsize: |
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181 (s,) = struct.unpack( |
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182 b'>i', self._data[off + indexfirst : off + sizeint + indexfirst] |
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183 ) |
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184 if lgt is not None: |
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185 self._offsets[count] = off |
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186 count += 1 |
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187 off += indexsize + s |
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188 if off != len(self._data): |
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189 raise ValueError(b"corrupted data") |
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190 return count |
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191 |
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192 def __delitem__(self, i): |
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193 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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194 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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195 i = i.start |
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196 self._check_index(i) |
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197 self._stripnodes(i) |
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198 if i < self._lgt: |
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199 self._offsets = self._offsets[:i] |
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200 self._lgt = i |
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201 self._extra = [] |
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202 else: |
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203 self._extra = self._extra[: i - self._lgt] |
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204 |
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205 def _calculate_index(self, i): |
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206 return self._offsets[i] |
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207 |
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208 |
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209 def parse_index2(data, inline): |
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210 if not inline: |
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211 return IndexObject(data), None |
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212 return InlinedIndexObject(data, inline), (0, data) |
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213 |
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214 |
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215 def parse_index_devel_nodemap(data, inline): |
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216 """like parse_index2, but alway return a PersistentNodeMapIndexObject |
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217 """ |
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218 return PersistentNodeMapIndexObject(data), None |
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219 |
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220 |
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221 def parse_dirstate(dmap, copymap, st): |
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222 parents = [st[:20], st[20:40]] |
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223 # dereference fields so they will be local in loop |
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224 format = b">cllll" |
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225 e_size = struct.calcsize(format) |
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226 pos1 = 40 |
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227 l = len(st) |
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228 |
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229 # the inner loop |
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230 while pos1 < l: |
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231 pos2 = pos1 + e_size |
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232 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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233 pos1 = pos2 + e[4] |
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234 f = st[pos2:pos1] |
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235 if b'\0' in f: |
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236 f, c = f.split(b'\0') |
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237 copymap[f] = c |
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238 dmap[f] = e[:4] |
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239 return parents |
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240 |
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241 |
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242 def pack_dirstate(dmap, copymap, pl, now): |
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243 now = int(now) |
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244 cs = stringio() |
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245 write = cs.write |
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246 write(b"".join(pl)) |
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247 for f, e in pycompat.iteritems(dmap): |
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248 if e[0] == b'n' and e[3] == now: |
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249 # The file was last modified "simultaneously" with the current |
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250 # write to dirstate (i.e. within the same second for file- |
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251 # systems with a granularity of 1 sec). This commonly happens |
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252 # for at least a couple of files on 'update'. |
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253 # The user could change the file without changing its size |
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254 # within the same second. Invalidate the file's mtime in |
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255 # dirstate, forcing future 'status' calls to compare the |
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256 # contents of the file if the size is the same. This prevents |
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257 # mistakenly treating such files as clean. |
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258 e = dirstatetuple(e[0], e[1], e[2], -1) |
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259 dmap[f] = e |
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260 |
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261 if f in copymap: |
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262 f = b"%s\0%s" % (f, copymap[f]) |
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263 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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264 write(e) |
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265 write(f) |
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266 return cs.getvalue() |