Mercurial > hg
annotate mercurial/pure/parsers.py @ 47034:0d8ff1f4ab0c
revlog: add a `entry_binary` method on index
The revlog index is already responsible for unpacking the binary entry, it would be
simpler to make it responsible for packing them. In practice the C version of
the index is already doing this internally.
We introduce a "entry_binary" method that return the binary version of an
existing revision. The method currently need to also take the revlog header to
deal with the "first revision" special case. We will introduce further refactor
in a later changeset to split that logic out.
Differential Revision: https://phab.mercurial-scm.org/D10508
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 08 Apr 2021 00:01:11 +0200 |
parents | d55b71393907 |
children | d57386e5c80e |
rev | line source |
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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) |
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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 def entry_binary(self, rev, header): |
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131 """return the raw binary string representing a revision""" |
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132 entry = self[rev] |
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133 p = revlog_constants.INDEX_ENTRY_V1.pack(*entry) |
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134 if rev == 0: |
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135 v_fmt = revlog_constants.INDEX_HEADER |
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136 v_bin = v_fmt.pack(header) |
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137 p = v_bin + p[v_fmt.size :] |
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138 return p |
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139 |
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140 |
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141 class IndexObject(BaseIndexObject): |
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142 def __init__(self, data): |
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143 assert len(data) % self.entry_size == 0, ( |
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144 len(data), |
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145 self.entry_size, |
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146 len(data) % self.entry_size, |
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147 ) |
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148 self._data = data |
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149 self._lgt = len(data) // self.entry_size |
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150 self._extra = [] |
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151 |
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152 def _calculate_index(self, i): |
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153 return i * self.entry_size |
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155 def __delitem__(self, i): |
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156 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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157 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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158 i = i.start |
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159 self._check_index(i) |
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160 self._stripnodes(i) |
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161 if i < self._lgt: |
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162 self._data = self._data[: i * self.entry_size] |
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163 self._lgt = i |
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164 self._extra = [] |
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165 else: |
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166 self._extra = self._extra[: i - self._lgt] |
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167 |
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168 |
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169 class PersistentNodeMapIndexObject(IndexObject): |
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170 """a Debug oriented class to test persistent nodemap |
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171 |
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172 We need a simple python object to test API and higher level behavior. See |
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173 the Rust implementation for more serious usage. This should be used only |
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174 through the dedicated `devel.persistent-nodemap` config. |
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175 """ |
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176 |
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177 def nodemap_data_all(self): |
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178 """Return bytes containing a full serialization of a nodemap |
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179 |
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180 The nodemap should be valid for the full set of revisions in the |
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181 index.""" |
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182 return nodemaputil.persistent_data(self) |
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183 |
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184 def nodemap_data_incremental(self): |
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185 """Return bytes containing a incremental update to persistent nodemap |
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186 |
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187 This containst the data for an append-only update of the data provided |
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188 in the last call to `update_nodemap_data`. |
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189 """ |
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190 if self._nm_root is None: |
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191 return None |
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192 docket = self._nm_docket |
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193 changed, data = nodemaputil.update_persistent_data( |
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194 self, self._nm_root, self._nm_max_idx, self._nm_docket.tip_rev |
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195 ) |
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196 |
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197 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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198 return docket, changed, data |
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199 |
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200 def update_nodemap_data(self, docket, nm_data): |
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201 """provide full block of persisted binary data for a nodemap |
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202 |
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203 The data are expected to come from disk. See `nodemap_data_all` for a |
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204 produceur of such data.""" |
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205 if nm_data is not None: |
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206 self._nm_root, self._nm_max_idx = nodemaputil.parse_data(nm_data) |
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207 if self._nm_root: |
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208 self._nm_docket = docket |
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209 else: |
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210 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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211 |
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212 |
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213 class InlinedIndexObject(BaseIndexObject): |
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214 def __init__(self, data, inline=0): |
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215 self._data = data |
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216 self._lgt = self._inline_scan(None) |
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217 self._inline_scan(self._lgt) |
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218 self._extra = [] |
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219 |
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220 def _inline_scan(self, lgt): |
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221 off = 0 |
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222 if lgt is not None: |
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223 self._offsets = [0] * lgt |
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224 count = 0 |
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225 while off <= len(self._data) - self.entry_size: |
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226 start = off + self.big_int_size |
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227 (s,) = struct.unpack( |
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228 b'>i', |
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229 self._data[start : start + self.int_size], |
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230 ) |
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231 if lgt is not None: |
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232 self._offsets[count] = off |
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233 count += 1 |
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234 off += self.entry_size + s |
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235 if off != len(self._data): |
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236 raise ValueError(b"corrupted data") |
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237 return count |
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238 |
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239 def __delitem__(self, i): |
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240 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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241 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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242 i = i.start |
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243 self._check_index(i) |
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244 self._stripnodes(i) |
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245 if i < self._lgt: |
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246 self._offsets = self._offsets[:i] |
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247 self._lgt = i |
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248 self._extra = [] |
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249 else: |
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250 self._extra = self._extra[: i - self._lgt] |
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251 |
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252 def _calculate_index(self, i): |
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253 return self._offsets[i] |
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254 |
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255 |
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256 def parse_index2(data, inline, revlogv2=False): |
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257 if not inline: |
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258 cls = IndexObject2 if revlogv2 else IndexObject |
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259 return cls(data), None |
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260 cls = InlinedIndexObject2 if revlogv2 else InlinedIndexObject |
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261 return cls(data, inline), (0, data) |
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262 |
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263 |
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264 class Index2Mixin(object): |
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265 index_format = revlog_constants.INDEX_ENTRY_V2 |
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266 null_item = (0, 0, 0, -1, -1, -1, -1, sha1nodeconstants.nullid, 0, 0) |
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267 |
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268 def replace_sidedata_info(self, i, sidedata_offset, sidedata_length): |
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269 """ |
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270 Replace an existing index entry's sidedata offset and length with new |
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271 ones. |
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272 This cannot be used outside of the context of sidedata rewriting, |
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273 inside the transaction that creates the revision `i`. |
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274 """ |
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275 if i < 0: |
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276 raise KeyError |
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277 self._check_index(i) |
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278 sidedata_format = b">Qi" |
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279 packed_size = struct.calcsize(sidedata_format) |
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280 if i >= self._lgt: |
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281 packed = _pack(sidedata_format, sidedata_offset, sidedata_length) |
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282 old = self._extra[i - self._lgt] |
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283 new = old[:64] + packed + old[64 + packed_size :] |
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284 self._extra[i - self._lgt] = new |
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285 else: |
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286 msg = b"cannot rewrite entries outside of this transaction" |
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287 raise KeyError(msg) |
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288 |
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289 def entry_binary(self, rev, header): |
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290 """return the raw binary string representing a revision""" |
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291 entry = self[rev] |
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292 p = revlog_constants.INDEX_ENTRY_V2.pack(*entry) |
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293 if rev == 0: |
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294 v_fmt = revlog_constants.INDEX_HEADER |
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295 v_bin = v_fmt.pack(header) |
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296 p = v_bin + p[v_fmt.size :] |
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297 return p |
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298 |
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299 |
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300 class IndexObject2(Index2Mixin, IndexObject): |
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301 pass |
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302 |
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303 |
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304 class InlinedIndexObject2(Index2Mixin, InlinedIndexObject): |
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305 def _inline_scan(self, lgt): |
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306 sidedata_length_pos = 72 |
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307 off = 0 |
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308 if lgt is not None: |
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309 self._offsets = [0] * lgt |
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310 count = 0 |
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311 while off <= len(self._data) - self.entry_size: |
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312 start = off + self.big_int_size |
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313 (data_size,) = struct.unpack( |
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314 b'>i', |
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315 self._data[start : start + self.int_size], |
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316 ) |
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317 start = off + sidedata_length_pos |
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318 (side_data_size,) = struct.unpack( |
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319 b'>i', self._data[start : start + self.int_size] |
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320 ) |
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321 if lgt is not None: |
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322 self._offsets[count] = off |
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323 count += 1 |
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324 off += self.entry_size + data_size + side_data_size |
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325 if off != len(self._data): |
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326 raise ValueError(b"corrupted data") |
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327 return count |
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328 |
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329 |
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330 def parse_index_devel_nodemap(data, inline): |
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331 """like parse_index2, but alway return a PersistentNodeMapIndexObject""" |
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332 return PersistentNodeMapIndexObject(data), None |
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333 |
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334 |
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335 def parse_dirstate(dmap, copymap, st): |
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336 parents = [st[:20], st[20:40]] |
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337 # dereference fields so they will be local in loop |
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338 format = b">cllll" |
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339 e_size = struct.calcsize(format) |
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340 pos1 = 40 |
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341 l = len(st) |
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342 |
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343 # the inner loop |
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344 while pos1 < l: |
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345 pos2 = pos1 + e_size |
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346 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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347 pos1 = pos2 + e[4] |
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348 f = st[pos2:pos1] |
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349 if b'\0' in f: |
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350 f, c = f.split(b'\0') |
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351 copymap[f] = c |
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352 dmap[f] = e[:4] |
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353 return parents |
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354 |
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355 |
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356 def pack_dirstate(dmap, copymap, pl, now): |
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357 now = int(now) |
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358 cs = stringio() |
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359 write = cs.write |
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360 write(b"".join(pl)) |
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361 for f, e in pycompat.iteritems(dmap): |
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362 if e[0] == b'n' and e[3] == now: |
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363 # The file was last modified "simultaneously" with the current |
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364 # write to dirstate (i.e. within the same second for file- |
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365 # systems with a granularity of 1 sec). This commonly happens |
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366 # for at least a couple of files on 'update'. |
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367 # The user could change the file without changing its size |
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368 # within the same second. Invalidate the file's mtime in |
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369 # dirstate, forcing future 'status' calls to compare the |
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370 # contents of the file if the size is the same. This prevents |
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371 # mistakenly treating such files as clean. |
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372 e = dirstatetuple(e[0], e[1], e[2], -1) |
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373 dmap[f] = e |
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374 |
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375 if f in copymap: |
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376 f = b"%s\0%s" % (f, copymap[f]) |
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377 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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378 write(e) |
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379 write(f) |
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380 return cs.getvalue() |