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annotate mercurial/obsolete.py @ 17126:8fa8717b47b6

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obsolete: write obsolete marker inside a transaction Marker are now written as soon as possible but within a transaction. Using a transaction ensure a proper behavior on error and rollback compatibility. Flush logic are not necessary anymore and are dropped from lock release. With this changeset, the obsstore is open, written and closed for every single added marker. This is expected to be highly inefficient and batched write should be implemented "quickly". Another issue is that every flush of the file will invalidate the obsstore filecache and trigger a full re instantiation of the repo.obsstore attribute (including, reading and parsing entry). This is also expected to be highly inefficient and proper filecache operation should be implemented "quickly" too. A side benefit of the filecache issue is that repo.obsstore object is properly invalidated on transaction abortion.
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
date Wed, 04 Jul 2012 02:21:04 +0200
parents 95d785ccb4e5
children 48c232873a54
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17070
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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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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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165 data = sopener.tryread('obsstore')
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166 if data:
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167 for marker in _readmarkers(data):
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168 self._load(marker)
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169
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170 def __iter__(self):
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171 return iter(self._all)
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172
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173 def __nonzero__(self):
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174 return bool(self._all)
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175
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176 def create(self, transaction, prec, succs=(), flag=0, metadata=None):
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177 """obsolete: add a new obsolete marker
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178
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179 * ensuring it is hashable
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180 * check mandatory metadata
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181 * encode metadata
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182 """
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183 if metadata is None:
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184 metadata = {}
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185 if len(prec) != 20:
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186 raise ValueError(prec)
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187 for succ in succs:
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188 if len(succ) != 20:
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189 raise ValueError(succ)
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190 marker = (str(prec), tuple(succs), int(flag), encodemeta(metadata))
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191 self.add(transaction, marker)
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192
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193 def add(self, transaction, marker):
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194 """Add a new marker to the store"""
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195 if marker not in self._all:
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196 f = self.sopener('obsstore', 'ab')
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197 try:
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198 offset = f.tell()
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199 transaction.add('obsstore', offset)
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200 if offset == 0:
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201 # new file add version header
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202 f.write(_pack('>B', _fmversion))
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203 _writemarkers(f.write, [marker])
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204 finally:
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205 # XXX: f.close() == filecache invalidation == obsstore rebuilt.
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206 # call 'filecacheentry.refresh()' here
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207 f.close()
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208 self._load(marker)
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209
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210 def mergemarkers(self, transation, data):
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211 other = _readmarkers(data)
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212 local = set(self._all)
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213 new = [m for m in other if m not in local]
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214 for marker in new:
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215 # XXX: N marker == N x (open, write, close)
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216 # we should write them all at once
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217 self.add(transation, marker)
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218
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219 def _load(self, marker):
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220 self._all.append(marker)
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221 pre, sucs = marker[:2]
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222 self.precursors.setdefault(pre, set()).add(marker)
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223 for suc in sucs:
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224 self.successors.setdefault(suc, set()).add(marker)
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225
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226 def _writemarkers(write, markers):
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227 # Kept separate from flushmarkers(), it will be reused for
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228 # markers exchange.
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229 for marker in markers:
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230 pre, sucs, flags, metadata = marker
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231 nbsuc = len(sucs)
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232 format = _fmfixed + (_fmnode * nbsuc)
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233 data = [nbsuc, len(metadata), flags, pre]
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234 data.extend(sucs)
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235 write(_pack(format, *data))
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236 write(metadata)
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237
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238 def listmarkers(repo):
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239 """List markers over pushkey"""
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240 if not repo.obsstore:
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241 return {}
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242 data = [_pack('>B', _fmversion)]
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243 _writemarkers(data.append, repo.obsstore)
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244 return {'dump': base85.b85encode(''.join(data))}
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245
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246 def pushmarker(repo, key, old, new):
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247 """Push markers over pushkey"""
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248 if key != 'dump':
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249 repo.ui.warn(_('unknown key: %r') % key)
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250 return 0
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251 if old:
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252 repo.ui.warn(_('unexpected old value') % key)
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253 return 0
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254 data = base85.b85decode(new)
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diff changeset
255 lock = repo.lock()
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256 try:
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diff changeset
257 tr = repo.transaction('pushkey: obsolete markers')
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diff changeset
258 try:
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diff changeset
259 repo.obsstore.mergemarkers(tr, data)
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diff changeset
260 tr.close()
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diff changeset
261 return 1
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diff changeset
262 finally:
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diff changeset
263 tr.release()
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diff changeset
264 finally:
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diff changeset
265 lock.release()
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266
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267 def allmarkers(repo):
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268 """all obsolete markers known in a repository"""
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diff changeset
269 for markerdata in repo.obsstore:
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diff changeset
270 yield marker(repo, markerdata)
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271
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diff changeset
272 def precursormarkers(ctx):
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diff changeset
273 """obsolete marker making this changeset obsolete"""
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274 for data in ctx._repo.obsstore.precursors.get(ctx.node(), ()):
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275 yield marker(ctx._repo, data)
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276
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277 def successormarkers(ctx):
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278 """obsolete marker marking this changeset as a successors"""
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279 for data in ctx._repo.obsstore.successors.get(ctx.node(), ()):
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diff changeset
280 yield marker(ctx._repo, data)
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281