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annotate mercurial/revlogutils/nodemap.py @ 44312:563dfdfd01a4

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nodemap: delete older raw data file when creating a new ones When we write new full files, it replace an older one with a different name. We add the associated cleanup for the older file to be removed after the transaction. We delete all file matching the expected pattern to give use extra chance to delete orphan files we might have failed to delete earlier. Note: eventually we won't rewrite all data for each transaction. This is coming in later changesets. Differential Revision: https://phab.mercurial-scm.org/D7839
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 15 Jan 2020 15:47:59 +0100
parents 2b72c4ff8ed1
children 7f4f7ef3133e
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1 # nodemap.py - nodemap related code and utilities
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2 #
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3 # Copyright 2019 Pierre-Yves David <pierre-yves.david@octobus.net>
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4 # Copyright 2019 George Racinet <georges.racinet@octobus.net>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8
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9 from __future__ import absolute_import
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10
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11 import os
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12 import re
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13 import struct
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14
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15 from .. import (
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16 error,
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17 node as nodemod,
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18 pycompat,
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19 )
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21
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22 class NodeMap(dict):
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23 def __missing__(self, x):
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24 raise error.RevlogError(b'unknown node: %s' % x)
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25
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26
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27 def persisted_data(revlog):
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28 """read the nodemap for a revlog from disk"""
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29 if revlog.nodemap_file is None:
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30 return None
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31 pdata = revlog.opener.tryread(revlog.nodemap_file)
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32 if not pdata:
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33 return None
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34 offset = 0
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35 (version,) = S_VERSION.unpack(pdata[offset : offset + S_VERSION.size])
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36 if version != ONDISK_VERSION:
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37 return None
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38 offset += S_VERSION.size
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39 (uuid_size,) = S_HEADER.unpack(pdata[offset : offset + S_HEADER.size])
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40 offset += S_HEADER.size
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41 uid = pdata[offset : offset + uuid_size]
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42
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43 filename = _rawdata_filepath(revlog, uid)
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44 return revlog.opener.tryread(filename)
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45
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46
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47 def setup_persistent_nodemap(tr, revlog):
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48 """Install whatever is needed transaction side to persist a nodemap on disk
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49
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50 (only actually persist the nodemap if this is relevant for this revlog)
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51 """
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52 if revlog._inline:
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53 return # inlined revlog are too small for this to be relevant
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54 if revlog.nodemap_file is None:
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55 return # we do not use persistent_nodemap on this revlog
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56 callback_id = b"revlog-persistent-nodemap-%s" % revlog.nodemap_file
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57 if tr.hasfinalize(callback_id):
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58 return # no need to register again
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59 tr.addfinalize(callback_id, lambda tr: _persist_nodemap(tr, revlog))
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60
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61
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62 def _persist_nodemap(tr, revlog):
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63 """Write nodemap data on disk for a given revlog
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64 """
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65 if getattr(revlog, 'filteredrevs', ()):
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66 raise error.ProgrammingError(
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67 "cannot persist nodemap of a filtered changelog"
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68 )
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69 if revlog.nodemap_file is None:
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70 msg = "calling persist nodemap on a revlog without the feature enableb"
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71 raise error.ProgrammingError(msg)
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72 data = persistent_data(revlog.index)
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73 uid = _make_uid()
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74 datafile = _rawdata_filepath(revlog, uid)
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75 olds = _other_rawdata_filepath(revlog, uid)
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76 if olds:
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77 realvfs = getattr(revlog, '_realopener', revlog.opener)
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78
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79 def cleanup(tr):
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80 for oldfile in olds:
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81 realvfs.tryunlink(oldfile)
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82
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83 callback_id = b"revlog-cleanup-nodemap-%s" % revlog.nodemap_file
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84 tr.addpostclose(callback_id, cleanup)
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85 # EXP-TODO: if this is a cache, this should use a cache vfs, not a
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86 # store vfs
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87 with revlog.opener(datafile, b'w') as fd:
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88 fd.write(data)
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89 # EXP-TODO: if this is a cache, this should use a cache vfs, not a
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90 # store vfs
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91 with revlog.opener(revlog.nodemap_file, b'w', atomictemp=True) as fp:
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92 fp.write(_serialize_docket(uid))
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93 # EXP-TODO: if the transaction abort, we should remove the new data and
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94 # reinstall the old one.
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95
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96
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97 ### Nodemap docket file
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98 #
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99 # The nodemap data are stored on disk using 2 files:
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100 #
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101 # * a raw data files containing a persistent nodemap
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102 # (see `Nodemap Trie` section)
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103 #
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104 # * a small "docket" file containing medatadata
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105 #
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106 # While the nodemap data can be multiple tens of megabytes, the "docket" is
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107 # small, it is easy to update it automatically or to duplicated its content
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108 # during a transaction.
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109 #
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110 # Multiple raw data can exist at the same time (The currently valid one and a
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111 # new one beind used by an in progress transaction). To accomodate this, the
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112 # filename hosting the raw data has a variable parts. The exact filename is
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113 # specified inside the "docket" file.
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114 #
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115 # The docket file contains information to find, qualify and validate the raw
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116 # data. Its content is currently very light, but it will expand as the on disk
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117 # nodemap gains the necessary features to be used in production.
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118
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119 # version 0 is experimental, no BC garantee, do no use outside of tests.
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120 ONDISK_VERSION = 0
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121
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122 S_VERSION = struct.Struct(">B")
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123 S_HEADER = struct.Struct(">B")
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124
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125 ID_SIZE = 8
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126
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127
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128 def _make_uid():
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129 """return a new unique identifier.
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130
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131 The identifier is random and composed of ascii characters."""
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132 return nodemod.hex(os.urandom(ID_SIZE))
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133
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134
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135 def _serialize_docket(uid):
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136 """return serialized bytes for a docket using the passed uid"""
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137 data = []
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138 data.append(S_VERSION.pack(ONDISK_VERSION))
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139 data.append(S_HEADER.pack(len(uid)))
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140 data.append(uid)
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141 return b''.join(data)
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142
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143
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144 def _rawdata_filepath(revlog, uid):
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145 """The (vfs relative) nodemap's rawdata file for a given uid"""
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146 prefix = revlog.nodemap_file[:-2]
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147 return b"%s-%s.nd" % (prefix, uid)
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148
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149
44312
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150 def _other_rawdata_filepath(revlog, uid):
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151 prefix = revlog.nodemap_file[:-2]
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152 pattern = re.compile(b"(^|/)%s-[0-9a-f]+\.nd$" % prefix)
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153 new_file_path = _rawdata_filepath(revlog, uid)
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154 new_file_name = revlog.opener.basename(new_file_path)
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155 dirpath = revlog.opener.dirname(new_file_path)
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156 others = []
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157 for f in revlog.opener.listdir(dirpath):
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158 if pattern.match(f) and f != new_file_name:
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159 others.append(f)
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160 return others
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161
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162
44307
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163 ### Nodemap Trie
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164 #
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165 # This is a simple reference implementation to compute and persist a nodemap
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166 # trie. This reference implementation is write only. The python version of this
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167 # is not expected to be actually used, since it wont provide performance
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168 # improvement over existing non-persistent C implementation.
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169 #
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170 # The nodemap is persisted as Trie using 4bits-address/16-entries block. each
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171 # revision can be adressed using its node shortest prefix.
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172 #
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173 # The trie is stored as a sequence of block. Each block contains 16 entries
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174 # (signed 64bit integer, big endian). Each entry can be one of the following:
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175 #
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176 # * value >= 0 -> index of sub-block
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177 # * value == -1 -> no value
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178 # * value < -1 -> a revision value: rev = -(value+10)
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179 #
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180 # The implementation focus on simplicity, not on performance. A Rust
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181 # implementation should provide a efficient version of the same binary
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182 # persistence. This reference python implementation is never meant to be
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183 # extensively use in production.
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184
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185
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186 def persistent_data(index):
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187 """return the persistent binary form for a nodemap for a given index
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188 """
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189 trie = _build_trie(index)
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190 return _persist_trie(trie)
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191
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192
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193 S_BLOCK = struct.Struct(">" + ("l" * 16))
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194
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195 NO_ENTRY = -1
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196 # rev 0 need to be -2 because 0 is used by block, -1 is a special value.
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197 REV_OFFSET = 2
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198
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199
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200 def _transform_rev(rev):
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201 """Return the number used to represent the rev in the tree.
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202
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203 (or retrieve a rev number from such representation)
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204
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205 Note that this is an involution, a function equal to its inverse (i.e.
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206 which gives the identity when applied to itself).
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207 """
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208 return -(rev + REV_OFFSET)
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209
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210
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211 def _to_int(hex_digit):
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212 """turn an hexadecimal digit into a proper integer"""
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213 return int(hex_digit, 16)
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214
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215
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216 def _build_trie(index):
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217 """build a nodemap trie
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218
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219 The nodemap stores revision number for each unique prefix.
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220
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221 Each block is a dictionary with keys in `[0, 15]`. Values are either
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222 another block or a revision number.
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223 """
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224 root = {}
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225 for rev in range(len(index)):
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226 hex = nodemod.hex(index[rev][7])
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227 _insert_into_block(index, 0, root, rev, hex)
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228 return root
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229
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230
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231 def _insert_into_block(index, level, block, current_rev, current_hex):
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232 """insert a new revision in a block
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233
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234 index: the index we are adding revision for
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235 level: the depth of the current block in the trie
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236 block: the block currently being considered
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237 current_rev: the revision number we are adding
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238 current_hex: the hexadecimal representation of the of that revision
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239 """
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240 hex_digit = _to_int(current_hex[level : level + 1])
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241 entry = block.get(hex_digit)
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242 if entry is None:
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243 # no entry, simply store the revision number
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244 block[hex_digit] = current_rev
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245 elif isinstance(entry, dict):
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246 # need to recurse to an underlying block
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247 _insert_into_block(index, level + 1, entry, current_rev, current_hex)
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248 else:
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249 # collision with a previously unique prefix, inserting new
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250 # vertices to fit both entry.
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251 other_hex = nodemod.hex(index[entry][7])
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252 other_rev = entry
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253 new = {}
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254 block[hex_digit] = new
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255 _insert_into_block(index, level + 1, new, other_rev, other_hex)
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256 _insert_into_block(index, level + 1, new, current_rev, current_hex)
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257
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258
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259 def _persist_trie(root):
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260 """turn a nodemap trie into persistent binary data
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261
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262 See `_build_trie` for nodemap trie structure"""
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263 block_map = {}
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264 chunks = []
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265 for tn in _walk_trie(root):
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266 block_map[id(tn)] = len(chunks)
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267 chunks.append(_persist_block(tn, block_map))
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268 return b''.join(chunks)
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269
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270
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271 def _walk_trie(block):
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272 """yield all the block in a trie
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273
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274 Children blocks are always yield before their parent block.
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275 """
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276 for (_, item) in sorted(block.items()):
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277 if isinstance(item, dict):
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278 for sub_block in _walk_trie(item):
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279 yield sub_block
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280 yield block
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281
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282
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283 def _persist_block(block_node, block_map):
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284 """produce persistent binary data for a single block
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285
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286 Children block are assumed to be already persisted and present in
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287 block_map.
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288 """
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289 data = tuple(_to_value(block_node.get(i), block_map) for i in range(16))
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290 return S_BLOCK.pack(*data)
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291
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292
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293 def _to_value(item, block_map):
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294 """persist any value as an integer"""
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295 if item is None:
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296 return NO_ENTRY
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297 elif isinstance(item, dict):
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298 return block_map[id(item)]
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299 else:
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300 return _transform_rev(item)