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annotate mercurial/obsolete.py @ 17220:bdac214a4705

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obsolete: obsstore.add now takes a list of markers. This allow efficient IO and it greatly simplify the merging of markers.
author Pierre-Yves.David@ens-lyon.org
date Fri, 13 Jul 2012 22:15:11 +0200
parents 494a970f68de
children 67f56ff5afcd
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1 # obsolete.py - obsolete markers handling
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2 #
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3 # Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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4 # Logilab SA <contact@logilab.fr>
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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 """Obsolete markers handling
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10
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11 An obsolete marker maps an old changeset to a list of new
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12 changesets. If the list of new changesets is empty, the old changeset
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13 is said to be "killed". Otherwise, the old changeset is being
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14 "replaced" by the new changesets.
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15
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16 Obsolete markers can be used to record and distribute changeset graph
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17 transformations performed by history rewriting operations, and help
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18 building new tools to reconciliate conflicting rewriting actions. To
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19 facilitate conflicts resolution, markers include various annotations
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20 besides old and news changeset identifiers, such as creation date or
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21 author name.
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22
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23
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24 Format
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25 ------
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26
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27 Markers are stored in an append-only file stored in
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28 '.hg/store/obsstore'.
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29
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30 The file starts with a version header:
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31
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32 - 1 unsigned byte: version number, starting at zero.
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33
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34
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35 The header is followed by the markers. Each marker is made of:
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36
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37 - 1 unsigned byte: number of new changesets "R", could be zero.
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38
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39 - 1 unsigned 32-bits integer: metadata size "M" in bytes.
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40
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41 - 1 byte: a bit field. It is reserved for flags used in obsolete
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42 markers common operations, to avoid repeated decoding of metadata
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43 entries.
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44
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45 - 20 bytes: obsoleted changeset identifier.
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46
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47 - N*20 bytes: new changesets identifiers.
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48
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49 - M bytes: metadata as a sequence of nul-terminated strings. Each
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50 string contains a key and a value, separated by a color ':', without
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51 additional encoding. Keys cannot contain '\0' or ':' and values
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52 cannot contain '\0'.
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53 """
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54 import struct
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55 from mercurial import util, base85
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56 from i18n import _
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57
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58 _pack = struct.pack
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59 _unpack = struct.unpack
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60
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61
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62
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63 # data used for parsing and writing
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64 _fmversion = 0
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65 _fmfixed = '>BIB20s'
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66 _fmnode = '20s'
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67 _fmfsize = struct.calcsize(_fmfixed)
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68 _fnodesize = struct.calcsize(_fmnode)
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69
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70 def _readmarkers(data):
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71 """Read and enumerate markers from raw data"""
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72 off = 0
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73 diskversion = _unpack('>B', data[off:off + 1])[0]
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74 off += 1
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75 if diskversion != _fmversion:
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76 raise util.Abort(_('parsing obsolete marker: unknown version %r')
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77 % diskversion)
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78
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79 # Loop on markers
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80 l = len(data)
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81 while off + _fmfsize <= l:
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82 # read fixed part
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83 cur = data[off:off + _fmfsize]
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84 off += _fmfsize
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85 nbsuc, mdsize, flags, pre = _unpack(_fmfixed, cur)
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86 # read replacement
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87 sucs = ()
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88 if nbsuc:
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89 s = (_fnodesize * nbsuc)
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90 cur = data[off:off + s]
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91 sucs = _unpack(_fmnode * nbsuc, cur)
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92 off += s
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93 # read metadata
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94 # (metadata will be decoded on demand)
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95 metadata = data[off:off + mdsize]
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96 if len(metadata) != mdsize:
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97 raise util.Abort(_('parsing obsolete marker: metadata is too '
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98 'short, %d bytes expected, got %d')
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99 % (len(metadata), mdsize))
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100 off += mdsize
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101 yield (pre, sucs, flags, metadata)
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102
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103 def encodemeta(meta):
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104 """Return encoded metadata string to string mapping.
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105
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106 Assume no ':' in key and no '\0' in both key and value."""
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107 for key, value in meta.iteritems():
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108 if ':' in key or '\0' in key:
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109 raise ValueError("':' and '\0' are forbidden in metadata key'")
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110 if '\0' in value:
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111 raise ValueError("':' are forbidden in metadata value'")
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112 return '\0'.join(['%s:%s' % (k, meta[k]) for k in sorted(meta)])
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113
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114 def decodemeta(data):
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115 """Return string to string dictionary from encoded version."""
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116 d = {}
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117 for l in data.split('\0'):
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118 if l:
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119 key, value = l.split(':')
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120 d[key] = value
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121 return d
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122
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123 class marker(object):
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124 """Wrap obsolete marker raw data"""
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125
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126 def __init__(self, repo, data):
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127 # the repo argument will be used to create changectx in later version
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128 self._repo = repo
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129 self._data = data
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130 self._decodedmeta = None
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131
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132 def precnode(self):
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133 """Precursor changeset node identifier"""
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134 return self._data[0]
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135
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136 def succnodes(self):
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137 """List of successor changesets node identifiers"""
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138 return self._data[1]
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139
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140 def metadata(self):
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141 """Decoded metadata dictionary"""
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142 if self._decodedmeta is None:
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143 self._decodedmeta = decodemeta(self._data[3])
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144 return self._decodedmeta
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145
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146 def date(self):
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147 """Creation date as (unixtime, offset)"""
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148 parts = self.metadata()['date'].split(' ')
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149 return (float(parts[0]), int(parts[1]))
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150
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151 class obsstore(object):
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152 """Store obsolete markers
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153
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154 Markers can be accessed with two mappings:
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155 - precursors: old -> set(new)
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156 - successors: new -> set(old)
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157 """
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158
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diff changeset
159 def __init__(self, sopener):
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160 self._all = []
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161 # new markers to serialize
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162 self.precursors = {}
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163 self.successors = {}
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164 self.sopener = sopener
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diff changeset
165 data = sopener.tryread('obsstore')
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diff changeset
166 if data:
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167 self._load(_readmarkers(data))
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168
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diff changeset
169 def __iter__(self):
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diff changeset
170 return iter(self._all)
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diff changeset
171
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diff changeset
172 def __nonzero__(self):
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173 return bool(self._all)
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174
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175 def create(self, transaction, prec, succs=(), flag=0, metadata=None):
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176 """obsolete: add a new obsolete marker
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177
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178 * ensuring it is hashable
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179 * check mandatory metadata
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180 * encode metadata
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181 """
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182 if metadata is None:
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183 metadata = {}
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184 if len(prec) != 20:
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185 raise ValueError(prec)
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186 for succ in succs:
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187 if len(succ) != 20:
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188 raise ValueError(succ)
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189 marker = (str(prec), tuple(succs), int(flag), encodemeta(metadata))
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diff changeset
190 self.add(transaction, [marker])
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191
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192 def add(self, transaction, markers):
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193 """Add new markers to the store
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194
17220
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195 Take care of filtering duplicate.
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196 Return the number of new marker."""
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diff changeset
197 new = [m for m in markers if m not in self._all]
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198 if new:
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diff changeset
199 f = self.sopener('obsstore', 'ab')
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diff changeset
200 try:
17195
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Adrian Buehlmann <adrian@cadifra.com>
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diff changeset
201 # Whether the file's current position is at the begin or at
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diff changeset
202 # the end after opening a file for appending is implementation
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diff changeset
203 # defined. So we must seek to the end before calling tell(),
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diff changeset
204 # or we may get a zero offset for non-zero sized files on
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diff changeset
205 # some platforms (issue3543).
17200
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diff changeset
206 f.seek(0, 2) # os.SEEK_END
17126
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diff changeset
207 offset = f.tell()
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diff changeset
208 transaction.add('obsstore', offset)
17219
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diff changeset
209 # offset == 0: new file - add the version header
17220
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diff changeset
210 for bytes in _encodemarkers(new, offset == 0):
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diff changeset
211 f.write(bytes)
17126
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diff changeset
212 finally:
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diff changeset
213 # XXX: f.close() == filecache invalidation == obsstore rebuilt.
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diff changeset
214 # call 'filecacheentry.refresh()' here
17124
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diff changeset
215 f.close()
17220
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diff changeset
216 self._load(new)
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diff changeset
217 return len(new)
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diff changeset
218
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diff changeset
219 def mergemarkers(self, transation, data):
17220
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diff changeset
220 markers = _readmarkers(data)
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diff changeset
221 self.add(transation, markers)
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222
17220
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diff changeset
223 def _load(self, markers):
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diff changeset
224 for mark in markers:
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diff changeset
225 self._all.append(mark)
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diff changeset
226 pre, sucs = mark[:2]
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diff changeset
227 self.precursors.setdefault(pre, set()).add(mark)
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diff changeset
228 for suc in sucs:
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diff changeset
229 self.successors.setdefault(suc, set()).add(mark)
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230
17219
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diff changeset
231 def _encodemarkers(markers, addheader=False):
17125
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diff changeset
232 # Kept separate from flushmarkers(), it will be reused for
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diff changeset
233 # markers exchange.
17219
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diff changeset
234 if addheader:
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diff changeset
235 yield _pack('>B', _fmversion)
17125
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diff changeset
236 for marker in markers:
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diff changeset
237 pre, sucs, flags, metadata = marker
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diff changeset
238 nbsuc = len(sucs)
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diff changeset
239 format = _fmfixed + (_fmnode * nbsuc)
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diff changeset
240 data = [nbsuc, len(metadata), flags, pre]
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diff changeset
241 data.extend(sucs)
17219
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diff changeset
242 yield _pack(format, *data)
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diff changeset
243 yield metadata
17075
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diff changeset
244
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diff changeset
245 def listmarkers(repo):
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diff changeset
246 """List markers over pushkey"""
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diff changeset
247 if not repo.obsstore:
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diff changeset
248 return {}
17219
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diff changeset
249 markers = _encodemarkers(repo.obsstore, True)
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diff changeset
250 return {'dump': base85.b85encode(''.join(markers))}
17073
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diff changeset
251
17075
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diff changeset
252 def pushmarker(repo, key, old, new):
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diff changeset
253 """Push markers over pushkey"""
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diff changeset
254 if key != 'dump':
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diff changeset
255 repo.ui.warn(_('unknown key: %r') % key)
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diff changeset
256 return 0
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diff changeset
257 if old:
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diff changeset
258 repo.ui.warn(_('unexpected old value') % key)
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diff changeset
259 return 0
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diff changeset
260 data = base85.b85decode(new)
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parents: 17073
diff changeset
261 lock = repo.lock()
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parents: 17073
diff changeset
262 try:
17126
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parents: 17125
diff changeset
263 tr = repo.transaction('pushkey: obsolete markers')
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 17125
diff changeset
264 try:
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parents: 17125
diff changeset
265 repo.obsstore.mergemarkers(tr, data)
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parents: 17125
diff changeset
266 tr.close()
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parents: 17125
diff changeset
267 return 1
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parents: 17125
diff changeset
268 finally:
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 17125
diff changeset
269 tr.release()
17075
28ed1c4511ce obsolete: exchange obsolete marker over pushkey
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parents: 17073
diff changeset
270 finally:
28ed1c4511ce obsolete: exchange obsolete marker over pushkey
Pierre-Yves.David@ens-lyon.org
parents: 17073
diff changeset
271 lock.release()
17073
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diff changeset
272
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diff changeset
273 def allmarkers(repo):
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parents: 17072
diff changeset
274 """all obsolete markers known in a repository"""
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parents: 17072
diff changeset
275 for markerdata in repo.obsstore:
3a79a5682af1 obsolete: add easy way to iterate over obsolete marker object
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diff changeset
276 yield marker(repo, markerdata)
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diff changeset
277
17076
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diff changeset
278 def precursormarkers(ctx):
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diff changeset
279 """obsolete marker making this changeset obsolete"""
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diff changeset
280 for data in ctx._repo.obsstore.precursors.get(ctx.node(), ()):
75f4180509a4 obsolete: function and method to access some obsolete data
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diff changeset
281 yield marker(ctx._repo, data)
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diff changeset
282
75f4180509a4 obsolete: function and method to access some obsolete data
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diff changeset
283 def successormarkers(ctx):
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diff changeset
284 """obsolete marker marking this changeset as a successors"""
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diff changeset
285 for data in ctx._repo.obsstore.successors.get(ctx.node(), ()):
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diff changeset
286 yield marker(ctx._repo, data)
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Pierre-Yves.David@ens-lyon.org
parents: 17075
diff changeset
287
17213
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
288 def anysuccessors(obsstore, node):
7eb5aa1f83fd obsolete: add an any successors function
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parents: 17200
diff changeset
289 """Yield every successor of <node>
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parents: 17200
diff changeset
290
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
291 This this a linear yield unsuitable to detect splitted changeset."""
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
292 remaining = set([node])
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
293 seen = set(remaining)
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
294 while remaining:
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
295 current = remaining.pop()
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
296 yield current
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
297 for mark in obsstore.precursors.get(current, ()):
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
298 for suc in mark[1]:
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
299 if suc not in seen:
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
300 seen.add(suc)
7eb5aa1f83fd obsolete: add an any successors function
Pierre-Yves David <pierre-yves.david@logilab.fr>
parents: 17200
diff changeset
301 remaining.add(suc)