Mercurial > hg
annotate mercurial/pure/parsers.py @ 47012:d55b71393907
node: replace nullid and friends with nodeconstants class
The introduction of 256bit hashes require changes to nullid and other
constant magic values. Start pushing them down from repository and
revlog where sensible.
Differential Revision: https://phab.mercurial-scm.org/D9465
author | Joerg Sonnenberger <joerg@bec.de> |
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date | Mon, 29 Mar 2021 01:52:06 +0200 |
parents | 3c9208702db3 |
children | 0d8ff1f4ab0c |
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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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46 |
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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) |
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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.index_format.unpack(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 |
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131 class IndexObject(BaseIndexObject): |
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132 def __init__(self, data): |
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133 assert len(data) % self.entry_size == 0 |
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134 self._data = data |
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135 self._lgt = len(data) // self.entry_size |
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136 self._extra = [] |
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137 |
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138 def _calculate_index(self, i): |
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139 return i * self.entry_size |
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141 def __delitem__(self, i): |
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142 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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143 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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144 i = i.start |
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145 self._check_index(i) |
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146 self._stripnodes(i) |
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147 if i < self._lgt: |
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148 self._data = self._data[: i * self.entry_size] |
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149 self._lgt = i |
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150 self._extra = [] |
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151 else: |
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152 self._extra = self._extra[: i - self._lgt] |
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153 |
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154 |
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155 class PersistentNodeMapIndexObject(IndexObject): |
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156 """a Debug oriented class to test persistent nodemap |
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157 |
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158 We need a simple python object to test API and higher level behavior. See |
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159 the Rust implementation for more serious usage. This should be used only |
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160 through the dedicated `devel.persistent-nodemap` config. |
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161 """ |
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162 |
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163 def nodemap_data_all(self): |
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164 """Return bytes containing a full serialization of a nodemap |
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165 |
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166 The nodemap should be valid for the full set of revisions in the |
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167 index.""" |
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168 return nodemaputil.persistent_data(self) |
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169 |
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170 def nodemap_data_incremental(self): |
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171 """Return bytes containing a incremental update to persistent nodemap |
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172 |
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173 This containst the data for an append-only update of the data provided |
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174 in the last call to `update_nodemap_data`. |
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175 """ |
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176 if self._nm_root is None: |
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177 return None |
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178 docket = self._nm_docket |
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179 changed, data = nodemaputil.update_persistent_data( |
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180 self, self._nm_root, self._nm_max_idx, self._nm_docket.tip_rev |
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181 ) |
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182 |
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183 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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184 return docket, changed, data |
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185 |
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186 def update_nodemap_data(self, docket, nm_data): |
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187 """provide full block of persisted binary data for a nodemap |
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188 |
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189 The data are expected to come from disk. See `nodemap_data_all` for a |
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190 produceur of such data.""" |
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191 if nm_data is not None: |
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192 self._nm_root, self._nm_max_idx = nodemaputil.parse_data(nm_data) |
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193 if self._nm_root: |
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194 self._nm_docket = docket |
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195 else: |
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196 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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197 |
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198 |
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199 class InlinedIndexObject(BaseIndexObject): |
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200 def __init__(self, data, inline=0): |
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201 self._data = data |
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202 self._lgt = self._inline_scan(None) |
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203 self._inline_scan(self._lgt) |
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204 self._extra = [] |
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205 |
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206 def _inline_scan(self, lgt): |
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207 off = 0 |
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208 if lgt is not None: |
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209 self._offsets = [0] * lgt |
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210 count = 0 |
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211 while off <= len(self._data) - self.entry_size: |
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212 start = off + self.big_int_size |
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213 (s,) = struct.unpack( |
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214 b'>i', |
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215 self._data[start : start + self.int_size], |
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216 ) |
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217 if lgt is not None: |
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218 self._offsets[count] = off |
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219 count += 1 |
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220 off += self.entry_size + s |
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221 if off != len(self._data): |
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222 raise ValueError(b"corrupted data") |
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223 return count |
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224 |
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225 def __delitem__(self, i): |
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226 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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227 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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228 i = i.start |
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229 self._check_index(i) |
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230 self._stripnodes(i) |
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231 if i < self._lgt: |
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232 self._offsets = self._offsets[:i] |
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233 self._lgt = i |
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234 self._extra = [] |
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235 else: |
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236 self._extra = self._extra[: i - self._lgt] |
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237 |
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238 def _calculate_index(self, i): |
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239 return self._offsets[i] |
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240 |
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241 |
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242 def parse_index2(data, inline, revlogv2=False): |
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243 if not inline: |
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244 cls = IndexObject2 if revlogv2 else IndexObject |
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245 return cls(data), None |
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246 cls = InlinedIndexObject2 if revlogv2 else InlinedIndexObject |
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247 return cls(data, inline), (0, data) |
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248 |
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249 |
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250 class Index2Mixin(object): |
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251 index_format = revlog_constants.INDEX_ENTRY_V2 |
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252 null_item = (0, 0, 0, -1, -1, -1, -1, sha1nodeconstants.nullid, 0, 0) |
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253 |
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254 def replace_sidedata_info(self, i, sidedata_offset, sidedata_length): |
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255 """ |
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256 Replace an existing index entry's sidedata offset and length with new |
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257 ones. |
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258 This cannot be used outside of the context of sidedata rewriting, |
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259 inside the transaction that creates the revision `i`. |
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260 """ |
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261 if i < 0: |
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262 raise KeyError |
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263 self._check_index(i) |
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264 sidedata_format = b">Qi" |
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265 packed_size = struct.calcsize(sidedata_format) |
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266 if i >= self._lgt: |
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267 packed = _pack(sidedata_format, sidedata_offset, sidedata_length) |
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268 old = self._extra[i - self._lgt] |
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269 new = old[:64] + packed + old[64 + packed_size :] |
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270 self._extra[i - self._lgt] = new |
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271 else: |
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272 msg = b"cannot rewrite entries outside of this transaction" |
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273 raise KeyError(msg) |
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274 |
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275 |
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276 class IndexObject2(Index2Mixin, IndexObject): |
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277 pass |
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278 |
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279 |
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280 class InlinedIndexObject2(Index2Mixin, InlinedIndexObject): |
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281 def _inline_scan(self, lgt): |
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282 sidedata_length_pos = 72 |
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283 off = 0 |
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284 if lgt is not None: |
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285 self._offsets = [0] * lgt |
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286 count = 0 |
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287 while off <= len(self._data) - self.entry_size: |
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288 start = off + self.big_int_size |
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289 (data_size,) = struct.unpack( |
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290 b'>i', |
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291 self._data[start : start + self.int_size], |
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292 ) |
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293 start = off + sidedata_length_pos |
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294 (side_data_size,) = struct.unpack( |
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295 b'>i', self._data[start : start + self.int_size] |
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296 ) |
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297 if lgt is not None: |
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298 self._offsets[count] = off |
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299 count += 1 |
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300 off += self.entry_size + data_size + side_data_size |
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301 if off != len(self._data): |
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302 raise ValueError(b"corrupted data") |
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303 return count |
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304 |
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305 |
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306 def parse_index_devel_nodemap(data, inline): |
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307 """like parse_index2, but alway return a PersistentNodeMapIndexObject""" |
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308 return PersistentNodeMapIndexObject(data), None |
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309 |
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310 |
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311 def parse_dirstate(dmap, copymap, st): |
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312 parents = [st[:20], st[20:40]] |
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313 # dereference fields so they will be local in loop |
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314 format = b">cllll" |
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315 e_size = struct.calcsize(format) |
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316 pos1 = 40 |
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317 l = len(st) |
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318 |
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319 # the inner loop |
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320 while pos1 < l: |
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321 pos2 = pos1 + e_size |
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322 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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323 pos1 = pos2 + e[4] |
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324 f = st[pos2:pos1] |
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325 if b'\0' in f: |
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326 f, c = f.split(b'\0') |
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327 copymap[f] = c |
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328 dmap[f] = e[:4] |
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329 return parents |
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330 |
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331 |
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332 def pack_dirstate(dmap, copymap, pl, now): |
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333 now = int(now) |
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334 cs = stringio() |
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335 write = cs.write |
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336 write(b"".join(pl)) |
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337 for f, e in pycompat.iteritems(dmap): |
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338 if e[0] == b'n' and e[3] == now: |
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339 # The file was last modified "simultaneously" with the current |
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340 # write to dirstate (i.e. within the same second for file- |
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341 # systems with a granularity of 1 sec). This commonly happens |
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342 # for at least a couple of files on 'update'. |
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343 # The user could change the file without changing its size |
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344 # within the same second. Invalidate the file's mtime in |
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345 # dirstate, forcing future 'status' calls to compare the |
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346 # contents of the file if the size is the same. This prevents |
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347 # mistakenly treating such files as clean. |
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348 e = dirstatetuple(e[0], e[1], e[2], -1) |
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349 dmap[f] = e |
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350 |
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351 if f in copymap: |
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352 f = b"%s\0%s" % (f, copymap[f]) |
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353 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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354 write(e) |
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355 write(f) |
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356 return cs.getvalue() |