Mercurial > hg
annotate mercurial/pure/parsers.py @ 47142:4292bed8da7c
revlog: make the index always return the same tuple
It is simpler to manage the diferrence in on disk format in the internal index
code itself and lets the rest of the code always handle the same object.
This will become even more important when the data we store will be entirely
different (for example the changelog does not need the "linkrev" field.
We start with item reading, we will deal with item writing in the next
changesets.
Differential Revision: https://phab.mercurial-scm.org/D10568
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 03 May 2021 12:21:15 +0200 |
parents | 223b47235d1c |
children | 47ffc754989a |
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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 pycompat, |
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19 util, |
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20 ) |
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21 |
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22 from ..revlogutils import nodemap as nodemaputil |
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23 from ..revlogutils import constants as revlog_constants |
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24 |
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25 stringio = pycompat.bytesio |
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26 |
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27 |
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28 _pack = struct.pack |
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29 _unpack = struct.unpack |
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30 _compress = zlib.compress |
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31 _decompress = zlib.decompress |
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32 |
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33 # Some code below makes tuples directly because it's more convenient. However, |
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34 # code outside this module should always use dirstatetuple. |
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35 def dirstatetuple(*x): |
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36 # x is a tuple |
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37 return x |
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38 |
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39 |
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40 def gettype(q): |
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41 return int(q & 0xFFFF) |
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42 |
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43 |
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44 def offset_type(offset, type): |
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45 return int(int(offset) << 16 | type) |
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47 |
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48 class BaseIndexObject(object): |
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49 # Format of an index entry according to Python's `struct` language |
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50 index_format = revlog_constants.INDEX_ENTRY_V1 |
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51 # Size of a C unsigned long long int, platform independent |
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52 big_int_size = struct.calcsize(b'>Q') |
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53 # Size of a C long int, platform independent |
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54 int_size = struct.calcsize(b'>i') |
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55 # An empty index entry, used as a default value to be overridden, or nullrev |
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56 null_item = (0, 0, 0, -1, -1, -1, -1, sha1nodeconstants.nullid, 0, 0) |
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57 |
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58 @util.propertycache |
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59 def entry_size(self): |
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60 return self.index_format.size |
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61 |
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62 @property |
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63 def nodemap(self): |
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64 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]" |
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65 util.nouideprecwarn(msg, b'5.3', stacklevel=2) |
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66 return self._nodemap |
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67 |
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68 @util.propertycache |
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69 def _nodemap(self): |
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70 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: nullrev}) |
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71 for r in range(0, len(self)): |
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72 n = self[r][7] |
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73 nodemap[n] = r |
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74 return nodemap |
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75 |
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76 def has_node(self, node): |
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77 """return True if the node exist in the index""" |
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78 return node in self._nodemap |
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79 |
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80 def rev(self, node): |
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81 """return a revision for a node |
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82 |
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83 If the node is unknown, raise a RevlogError""" |
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84 return self._nodemap[node] |
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85 |
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86 def get_rev(self, node): |
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87 """return a revision for a node |
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88 |
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89 If the node is unknown, return None""" |
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90 return self._nodemap.get(node) |
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91 |
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92 def _stripnodes(self, start): |
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93 if '_nodemap' in vars(self): |
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94 for r in range(start, len(self)): |
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95 n = self[r][7] |
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96 del self._nodemap[n] |
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97 |
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98 def clearcaches(self): |
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99 self.__dict__.pop('_nodemap', None) |
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100 |
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101 def __len__(self): |
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102 return self._lgt + len(self._extra) |
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103 |
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104 def append(self, tup): |
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105 if '_nodemap' in vars(self): |
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106 self._nodemap[tup[7]] = len(self) |
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107 data = self.index_format.pack(*tup) |
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108 self._extra.append(data) |
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109 |
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110 def _check_index(self, i): |
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111 if not isinstance(i, int): |
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112 raise TypeError(b"expecting int indexes") |
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113 if i < 0 or i >= len(self): |
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114 raise IndexError |
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115 |
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116 def __getitem__(self, i): |
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117 if i == -1: |
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118 return self.null_item |
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119 self._check_index(i) |
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120 if i >= self._lgt: |
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121 data = self._extra[i - self._lgt] |
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122 else: |
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123 index = self._calculate_index(i) |
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124 data = self._data[index : index + self.entry_size] |
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125 r = self._unpack_entry(data) |
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126 if self._lgt and i == 0: |
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127 r = (offset_type(0, gettype(r[0])),) + r[1:] |
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128 return r |
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129 |
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130 def _unpack_entry(self, data): |
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131 r = self.index_format.unpack(data) |
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132 r = r + (0, 0) |
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133 return r |
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134 |
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135 def pack_header(self, header): |
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136 """pack header information as binary""" |
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137 v_fmt = revlog_constants.INDEX_HEADER |
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138 return v_fmt.pack(header) |
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139 |
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140 def entry_binary(self, rev): |
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141 """return the raw binary string representing a revision""" |
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142 entry = self[rev] |
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143 p = revlog_constants.INDEX_ENTRY_V1.pack(*entry[:8]) |
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144 if rev == 0: |
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145 p = p[revlog_constants.INDEX_HEADER.size :] |
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146 return p |
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147 |
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148 |
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149 class IndexObject(BaseIndexObject): |
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150 def __init__(self, data): |
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151 assert len(data) % self.entry_size == 0, ( |
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152 len(data), |
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153 self.entry_size, |
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154 len(data) % self.entry_size, |
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155 ) |
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156 self._data = data |
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157 self._lgt = len(data) // self.entry_size |
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158 self._extra = [] |
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159 |
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160 def _calculate_index(self, i): |
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161 return i * self.entry_size |
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163 def __delitem__(self, i): |
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164 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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165 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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166 i = i.start |
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167 self._check_index(i) |
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168 self._stripnodes(i) |
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169 if i < self._lgt: |
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170 self._data = self._data[: i * self.entry_size] |
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171 self._lgt = i |
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172 self._extra = [] |
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173 else: |
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174 self._extra = self._extra[: i - self._lgt] |
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175 |
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176 |
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177 class PersistentNodeMapIndexObject(IndexObject): |
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178 """a Debug oriented class to test persistent nodemap |
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179 |
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180 We need a simple python object to test API and higher level behavior. See |
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181 the Rust implementation for more serious usage. This should be used only |
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182 through the dedicated `devel.persistent-nodemap` config. |
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183 """ |
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184 |
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185 def nodemap_data_all(self): |
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186 """Return bytes containing a full serialization of a nodemap |
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187 |
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188 The nodemap should be valid for the full set of revisions in the |
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189 index.""" |
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190 return nodemaputil.persistent_data(self) |
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191 |
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192 def nodemap_data_incremental(self): |
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193 """Return bytes containing a incremental update to persistent nodemap |
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194 |
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195 This containst the data for an append-only update of the data provided |
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196 in the last call to `update_nodemap_data`. |
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197 """ |
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198 if self._nm_root is None: |
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199 return None |
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200 docket = self._nm_docket |
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201 changed, data = nodemaputil.update_persistent_data( |
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202 self, self._nm_root, self._nm_max_idx, self._nm_docket.tip_rev |
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203 ) |
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204 |
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205 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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206 return docket, changed, data |
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207 |
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208 def update_nodemap_data(self, docket, nm_data): |
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209 """provide full block of persisted binary data for a nodemap |
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210 |
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211 The data are expected to come from disk. See `nodemap_data_all` for a |
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212 produceur of such data.""" |
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213 if nm_data is not None: |
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214 self._nm_root, self._nm_max_idx = nodemaputil.parse_data(nm_data) |
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215 if self._nm_root: |
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216 self._nm_docket = docket |
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217 else: |
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218 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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219 |
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220 |
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221 class InlinedIndexObject(BaseIndexObject): |
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222 def __init__(self, data, inline=0): |
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223 self._data = data |
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224 self._lgt = self._inline_scan(None) |
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225 self._inline_scan(self._lgt) |
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226 self._extra = [] |
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227 |
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228 def _inline_scan(self, lgt): |
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229 off = 0 |
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230 if lgt is not None: |
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231 self._offsets = [0] * lgt |
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232 count = 0 |
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233 while off <= len(self._data) - self.entry_size: |
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234 start = off + self.big_int_size |
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235 (s,) = struct.unpack( |
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236 b'>i', |
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237 self._data[start : start + self.int_size], |
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238 ) |
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239 if lgt is not None: |
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240 self._offsets[count] = off |
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241 count += 1 |
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242 off += self.entry_size + s |
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243 if off != len(self._data): |
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244 raise ValueError(b"corrupted data") |
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245 return count |
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246 |
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247 def __delitem__(self, i): |
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248 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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249 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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250 i = i.start |
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251 self._check_index(i) |
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252 self._stripnodes(i) |
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253 if i < self._lgt: |
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254 self._offsets = self._offsets[:i] |
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255 self._lgt = i |
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256 self._extra = [] |
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257 else: |
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258 self._extra = self._extra[: i - self._lgt] |
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259 |
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260 def _calculate_index(self, i): |
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261 return self._offsets[i] |
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262 |
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263 |
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264 def parse_index2(data, inline, revlogv2=False): |
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265 if not inline: |
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266 cls = IndexObject2 if revlogv2 else IndexObject |
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267 return cls(data), None |
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268 cls = InlinedIndexObject2 if revlogv2 else InlinedIndexObject |
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269 return cls(data, inline), (0, data) |
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270 |
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271 |
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272 class Index2Mixin(object): |
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273 index_format = revlog_constants.INDEX_ENTRY_V2 |
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274 |
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275 def replace_sidedata_info( |
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276 self, i, sidedata_offset, sidedata_length, offset_flags |
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277 ): |
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278 """ |
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279 Replace an existing index entry's sidedata offset and length with new |
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280 ones. |
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281 This cannot be used outside of the context of sidedata rewriting, |
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282 inside the transaction that creates the revision `i`. |
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283 """ |
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284 if i < 0: |
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285 raise KeyError |
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286 self._check_index(i) |
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287 sidedata_format = b">Qi" |
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288 packed_size = struct.calcsize(sidedata_format) |
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289 if i >= self._lgt: |
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290 packed = _pack(sidedata_format, sidedata_offset, sidedata_length) |
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291 old = self._extra[i - self._lgt] |
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292 offset_flags = struct.pack(b">Q", offset_flags) |
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293 new = offset_flags + old[8:64] + packed + old[64 + packed_size :] |
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294 self._extra[i - self._lgt] = new |
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295 else: |
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296 msg = b"cannot rewrite entries outside of this transaction" |
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297 raise KeyError(msg) |
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298 |
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299 def _unpack_entry(self, data): |
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300 return self.index_format.unpack(data) |
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301 |
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302 def entry_binary(self, rev): |
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303 """return the raw binary string representing a revision""" |
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304 entry = self[rev] |
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305 p = revlog_constants.INDEX_ENTRY_V2.pack(*entry) |
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306 if rev == 0: |
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307 p = p[revlog_constants.INDEX_HEADER.size :] |
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308 return p |
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309 |
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310 |
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311 class IndexObject2(Index2Mixin, IndexObject): |
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312 pass |
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313 |
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314 |
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315 class InlinedIndexObject2(Index2Mixin, InlinedIndexObject): |
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316 def _inline_scan(self, lgt): |
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317 sidedata_length_pos = 72 |
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318 off = 0 |
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319 if lgt is not None: |
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320 self._offsets = [0] * lgt |
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321 count = 0 |
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322 while off <= len(self._data) - self.entry_size: |
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323 start = off + self.big_int_size |
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324 (data_size,) = struct.unpack( |
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325 b'>i', |
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326 self._data[start : start + self.int_size], |
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327 ) |
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328 start = off + sidedata_length_pos |
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329 (side_data_size,) = struct.unpack( |
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330 b'>i', self._data[start : start + self.int_size] |
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331 ) |
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332 if lgt is not None: |
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333 self._offsets[count] = off |
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334 count += 1 |
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335 off += self.entry_size + data_size + side_data_size |
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336 if off != len(self._data): |
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337 raise ValueError(b"corrupted data") |
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338 return count |
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339 |
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340 |
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341 def parse_index_devel_nodemap(data, inline): |
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342 """like parse_index2, but alway return a PersistentNodeMapIndexObject""" |
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343 return PersistentNodeMapIndexObject(data), None |
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344 |
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345 |
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346 def parse_dirstate(dmap, copymap, st): |
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347 parents = [st[:20], st[20:40]] |
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348 # dereference fields so they will be local in loop |
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349 format = b">cllll" |
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350 e_size = struct.calcsize(format) |
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351 pos1 = 40 |
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352 l = len(st) |
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353 |
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354 # the inner loop |
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355 while pos1 < l: |
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356 pos2 = pos1 + e_size |
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357 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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358 pos1 = pos2 + e[4] |
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359 f = st[pos2:pos1] |
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360 if b'\0' in f: |
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361 f, c = f.split(b'\0') |
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362 copymap[f] = c |
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363 dmap[f] = e[:4] |
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364 return parents |
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365 |
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366 |
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367 def pack_dirstate(dmap, copymap, pl, now): |
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368 now = int(now) |
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369 cs = stringio() |
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370 write = cs.write |
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371 write(b"".join(pl)) |
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372 for f, e in pycompat.iteritems(dmap): |
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373 if e[0] == b'n' and e[3] == now: |
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374 # The file was last modified "simultaneously" with the current |
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375 # write to dirstate (i.e. within the same second for file- |
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376 # systems with a granularity of 1 sec). This commonly happens |
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377 # for at least a couple of files on 'update'. |
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378 # The user could change the file without changing its size |
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379 # within the same second. Invalidate the file's mtime in |
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380 # dirstate, forcing future 'status' calls to compare the |
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381 # contents of the file if the size is the same. This prevents |
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382 # mistakenly treating such files as clean. |
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383 e = dirstatetuple(e[0], e[1], e[2], -1) |
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384 dmap[f] = e |
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385 |
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386 if f in copymap: |
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387 f = b"%s\0%s" % (f, copymap[f]) |
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388 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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389 write(e) |
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390 write(f) |
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391 return cs.getvalue() |