Mercurial > hg
annotate mercurial/utils/storageutil.py @ 40432:968dd7e02ac5
changegroup: allow to force delta to be against p1
This new developer option is useful to general more "generic" bundle. Without
this option, a bundle generated from the repository use deltas similar to the
one stored in the specific repository it was generated from. This makes
performance testing a bit tricky.
Using deltas similar to the final result means all delta stored in the bundle
can be applied to the target repository without any further processing (except
for the rare case of a full snapshot). The application of such bundles
(almost) never exercises the (slower) path of searching for a new valid delta.
This result in unrealistic and too favorable timing and profile.
Instead, we introduce an option to make sure all revisions are stored as a
delta against p1. It might not be the best generation option, but it
guarantees that the content will be "generic", not favoring a specific target.
author | Boris Feld <boris.feld@octobus.net> |
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date | Wed, 10 Oct 2018 00:21:02 +0200 |
parents | 59a870a4ad6e |
children | 4fe63b573791 |
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1 # storageutil.py - Storage functionality agnostic of backend implementation. |
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2 # |
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3 # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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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 hashlib |
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11 import re |
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12 import struct |
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13 |
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14 from ..i18n import _ |
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15 from ..node import ( |
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16 bin, |
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17 nullid, |
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18 nullrev, |
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19 ) |
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20 from .. import ( |
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21 dagop, |
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22 error, |
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23 mdiff, |
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24 pycompat, |
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25 repository, |
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26 ) |
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27 |
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28 _nullhash = hashlib.sha1(nullid) |
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29 |
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30 def hashrevisionsha1(text, p1, p2): |
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31 """Compute the SHA-1 for revision data and its parents. |
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32 |
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33 This hash combines both the current file contents and its history |
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34 in a manner that makes it easy to distinguish nodes with the same |
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35 content in the revision graph. |
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36 """ |
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37 # As of now, if one of the parent node is null, p2 is null |
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38 if p2 == nullid: |
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39 # deep copy of a hash is faster than creating one |
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40 s = _nullhash.copy() |
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41 s.update(p1) |
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42 else: |
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43 # none of the parent nodes are nullid |
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44 if p1 < p2: |
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45 a = p1 |
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46 b = p2 |
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47 else: |
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48 a = p2 |
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49 b = p1 |
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50 s = hashlib.sha1(a) |
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51 s.update(b) |
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52 s.update(text) |
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53 return s.digest() |
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54 |
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55 METADATA_RE = re.compile(b'\x01\n') |
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56 |
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57 def parsemeta(text): |
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58 """Parse metadata header from revision data. |
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59 |
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60 Returns a 2-tuple of (metadata, offset), where both can be None if there |
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61 is no metadata. |
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62 """ |
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63 # text can be buffer, so we can't use .startswith or .index |
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64 if text[:2] != b'\x01\n': |
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65 return None, None |
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66 s = METADATA_RE.search(text, 2).start() |
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67 mtext = text[2:s] |
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68 meta = {} |
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69 for l in mtext.splitlines(): |
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70 k, v = l.split(b': ', 1) |
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71 meta[k] = v |
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72 return meta, s + 2 |
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73 |
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74 def packmeta(meta, text): |
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75 """Add metadata to fulltext to produce revision text.""" |
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76 keys = sorted(meta) |
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77 metatext = b''.join(b'%s: %s\n' % (k, meta[k]) for k in keys) |
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78 return b'\x01\n%s\x01\n%s' % (metatext, text) |
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79 |
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80 def iscensoredtext(text): |
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81 meta = parsemeta(text)[0] |
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82 return meta and b'censored' in meta |
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83 |
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84 def filtermetadata(text): |
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85 """Extract just the revision data from source text. |
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86 |
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87 Returns ``text`` unless it has a metadata header, in which case we return |
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88 a new buffer without hte metadata. |
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89 """ |
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90 if not text.startswith(b'\x01\n'): |
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91 return text |
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92 |
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93 offset = text.index(b'\x01\n', 2) |
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94 return text[offset + 2:] |
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95 |
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96 def filerevisioncopied(store, node): |
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97 """Resolve file revision copy metadata. |
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98 |
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99 Returns ``False`` if the file has no copy metadata. Otherwise a |
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100 2-tuple of the source filename and node. |
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101 """ |
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102 if store.parents(node)[0] != nullid: |
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103 return False |
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104 |
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105 meta = parsemeta(store.revision(node))[0] |
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106 |
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107 # copy and copyrev occur in pairs. In rare cases due to old bugs, |
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108 # one can occur without the other. So ensure both are present to flag |
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109 # as a copy. |
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110 if meta and b'copy' in meta and b'copyrev' in meta: |
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111 return meta[b'copy'], bin(meta[b'copyrev']) |
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112 |
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113 return False |
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114 |
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115 def filedataequivalent(store, node, filedata): |
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116 """Determines whether file data is equivalent to a stored node. |
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117 |
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118 Returns True if the passed file data would hash to the same value |
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119 as a stored revision and False otherwise. |
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120 |
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121 When a stored revision is censored, filedata must be empty to have |
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122 equivalence. |
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123 |
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124 When a stored revision has copy metadata, it is ignored as part |
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125 of the compare. |
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126 """ |
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127 |
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128 if filedata.startswith(b'\x01\n'): |
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129 revisiontext = b'\x01\n\x01\n' + filedata |
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130 else: |
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131 revisiontext = filedata |
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132 |
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133 p1, p2 = store.parents(node) |
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134 |
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135 computednode = hashrevisionsha1(revisiontext, p1, p2) |
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136 |
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137 if computednode == node: |
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138 return True |
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139 |
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140 # Censored files compare against the empty file. |
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141 if store.iscensored(store.rev(node)): |
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142 return filedata == b'' |
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143 |
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144 # Renaming a file produces a different hash, even if the data |
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145 # remains unchanged. Check if that's the case. |
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146 if store.renamed(node): |
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147 return store.read(node) == filedata |
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148 |
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149 return False |
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150 |
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151 def iterrevs(storelen, start=0, stop=None): |
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152 """Iterate over revision numbers in a store.""" |
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153 step = 1 |
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154 |
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155 if stop is not None: |
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156 if start > stop: |
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157 step = -1 |
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158 stop += step |
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159 if stop > storelen: |
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160 stop = storelen |
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161 else: |
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162 stop = storelen |
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163 |
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164 return pycompat.xrange(start, stop, step) |
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165 |
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166 def fileidlookup(store, fileid, identifier): |
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167 """Resolve the file node for a value. |
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168 |
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169 ``store`` is an object implementing the ``ifileindex`` interface. |
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170 |
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171 ``fileid`` can be: |
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172 |
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173 * A 20 byte binary node. |
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174 * An integer revision number |
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175 * A 40 byte hex node. |
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176 * A bytes that can be parsed as an integer representing a revision number. |
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177 |
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178 ``identifier`` is used to populate ``error.LookupError`` with an identifier |
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179 for the store. |
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180 |
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181 Raises ``error.LookupError`` on failure. |
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182 """ |
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183 if isinstance(fileid, int): |
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184 try: |
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185 return store.node(fileid) |
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186 except IndexError: |
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187 raise error.LookupError('%d' % fileid, identifier, |
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188 _('no match found')) |
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189 |
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190 if len(fileid) == 20: |
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191 try: |
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192 store.rev(fileid) |
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193 return fileid |
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194 except error.LookupError: |
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195 pass |
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196 |
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197 if len(fileid) == 40: |
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198 try: |
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199 rawnode = bin(fileid) |
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200 store.rev(rawnode) |
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201 return rawnode |
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202 except TypeError: |
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203 pass |
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204 |
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205 try: |
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206 rev = int(fileid) |
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207 |
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208 if b'%d' % rev != fileid: |
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209 raise ValueError |
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210 |
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211 try: |
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212 return store.node(rev) |
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213 except (IndexError, TypeError): |
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214 pass |
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215 except (ValueError, OverflowError): |
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216 pass |
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217 |
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218 raise error.LookupError(fileid, identifier, _('no match found')) |
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219 |
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220 def resolvestripinfo(minlinkrev, tiprev, headrevs, linkrevfn, parentrevsfn): |
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221 """Resolve information needed to strip revisions. |
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222 |
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223 Finds the minimum revision number that must be stripped in order to |
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224 strip ``minlinkrev``. |
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225 |
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226 Returns a 2-tuple of the minimum revision number to do that and a set |
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227 of all revision numbers that have linkrevs that would be broken |
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228 by that strip. |
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229 |
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230 ``tiprev`` is the current tip-most revision. It is ``len(store) - 1``. |
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231 ``headrevs`` is an iterable of head revisions. |
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232 ``linkrevfn`` is a callable that receives a revision and returns a linked |
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233 revision. |
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234 ``parentrevsfn`` is a callable that receives a revision number and returns |
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235 an iterable of its parent revision numbers. |
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236 """ |
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237 brokenrevs = set() |
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238 strippoint = tiprev + 1 |
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239 |
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240 heads = {} |
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241 futurelargelinkrevs = set() |
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242 for head in headrevs: |
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243 headlinkrev = linkrevfn(head) |
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244 heads[head] = headlinkrev |
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245 if headlinkrev >= minlinkrev: |
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246 futurelargelinkrevs.add(headlinkrev) |
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247 |
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248 # This algorithm involves walking down the rev graph, starting at the |
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249 # heads. Since the revs are topologically sorted according to linkrev, |
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250 # once all head linkrevs are below the minlink, we know there are |
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251 # no more revs that could have a linkrev greater than minlink. |
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252 # So we can stop walking. |
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253 while futurelargelinkrevs: |
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254 strippoint -= 1 |
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255 linkrev = heads.pop(strippoint) |
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256 |
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257 if linkrev < minlinkrev: |
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258 brokenrevs.add(strippoint) |
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259 else: |
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260 futurelargelinkrevs.remove(linkrev) |
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261 |
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262 for p in parentrevsfn(strippoint): |
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263 if p != nullrev: |
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264 plinkrev = linkrevfn(p) |
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265 heads[p] = plinkrev |
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266 if plinkrev >= minlinkrev: |
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267 futurelargelinkrevs.add(plinkrev) |
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268 |
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269 return strippoint, brokenrevs |
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270 |
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271 def emitrevisions(store, nodes, nodesorder, resultcls, deltaparentfn=None, |
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272 candeltafn=None, rawsizefn=None, revdifffn=None, flagsfn=None, |
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273 deltamode=repository.CG_DELTAMODE_STD, |
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274 revisiondata=False, assumehaveparentrevisions=False): |
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275 """Generic implementation of ifiledata.emitrevisions(). |
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276 |
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277 Emitting revision data is subtly complex. This function attempts to |
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278 encapsulate all the logic for doing so in a backend-agnostic way. |
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279 |
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280 ``store`` |
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281 Object conforming to ``ifilestorage`` interface. |
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282 |
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283 ``nodes`` |
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284 List of revision nodes whose data to emit. |
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285 |
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286 ``resultcls`` |
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287 A type implementing the ``irevisiondelta`` interface that will be |
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288 constructed and returned. |
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289 |
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290 ``deltaparentfn`` (optional) |
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291 Callable receiving a revision number and returning the revision number |
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292 of a revision that the internal delta is stored against. This delta |
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293 will be preferred over computing a new arbitrary delta. |
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294 |
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295 If not defined, a delta will always be computed from raw revision |
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296 data. |
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297 |
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298 ``candeltafn`` (optional) |
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299 Callable receiving a pair of revision numbers that returns a bool |
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300 indicating whether a delta between them can be produced. |
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301 |
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302 If not defined, it is assumed that any two revisions can delta with |
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303 each other. |
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304 |
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305 ``rawsizefn`` (optional) |
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306 Callable receiving a revision number and returning the length of the |
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307 ``store.revision(rev, raw=True)``. |
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308 |
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309 If not defined, ``len(store.revision(rev, raw=True))`` will be called. |
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310 |
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311 ``revdifffn`` (optional) |
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312 Callable receiving a pair of revision numbers that returns a delta |
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313 between them. |
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314 |
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315 If not defined, a delta will be computed by invoking mdiff code |
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316 on ``store.revision()`` results. |
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317 |
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318 Defining this function allows a precomputed or stored delta to be |
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319 used without having to compute on. |
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320 |
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321 ``flagsfn`` (optional) |
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322 Callable receiving a revision number and returns the integer flags |
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323 value for it. If not defined, flags value will be 0. |
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324 |
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325 ``deltamode`` |
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326 constaint on delta to be sent: |
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327 * CG_DELTAMODE_STD - normal mode, try to reuse storage deltas, |
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328 * CG_DELTAMODE_PREV - only delta against "prev", |
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329 * CG_DELTAMODE_FULL - only issue full snapshot. |
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330 |
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331 Whether to send fulltext revisions instead of deltas, if allowed. |
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332 |
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333 ``nodesorder`` |
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334 ``revisiondata`` |
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335 ``assumehaveparentrevisions`` |
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336 """ |
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337 |
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338 fnode = store.node |
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339 frev = store.rev |
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340 |
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341 if nodesorder == 'nodes': |
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342 revs = [frev(n) for n in nodes] |
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343 elif nodesorder == 'storage': |
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344 revs = sorted(frev(n) for n in nodes) |
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345 else: |
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346 revs = set(frev(n) for n in nodes) |
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347 revs = dagop.linearize(revs, store.parentrevs) |
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348 |
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349 prevrev = None |
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350 |
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351 if deltamode == repository.CG_DELTAMODE_PREV or assumehaveparentrevisions: |
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352 prevrev = store.parentrevs(revs[0])[0] |
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353 |
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354 # Set of revs available to delta against. |
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355 available = set() |
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356 |
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357 for rev in revs: |
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358 if rev == nullrev: |
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359 continue |
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360 |
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361 node = fnode(rev) |
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362 p1rev, p2rev = store.parentrevs(rev) |
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363 |
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364 if deltaparentfn: |
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365 deltaparentrev = deltaparentfn(rev) |
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366 else: |
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367 deltaparentrev = nullrev |
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368 |
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369 # Forced delta against previous mode. |
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370 if deltamode == repository.CG_DELTAMODE_PREV: |
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371 baserev = prevrev |
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372 |
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373 # We're instructed to send fulltext. Honor that. |
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374 elif deltamode == repository.CG_DELTAMODE_FULL: |
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375 baserev = nullrev |
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376 # We're instructed to use p1. Honor that |
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377 elif deltamode == repository.CG_DELTAMODE_P1: |
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378 baserev = p1rev |
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379 |
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380 # There is a delta in storage. We try to use that because it |
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381 # amounts to effectively copying data from storage and is |
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382 # therefore the fastest. |
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383 elif deltaparentrev != nullrev: |
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384 # Base revision was already emitted in this group. We can |
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385 # always safely use the delta. |
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386 if deltaparentrev in available: |
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387 baserev = deltaparentrev |
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388 |
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389 # Base revision is a parent that hasn't been emitted already. |
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390 # Use it if we can assume the receiver has the parent revision. |
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391 elif (assumehaveparentrevisions |
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392 and deltaparentrev in (p1rev, p2rev)): |
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393 baserev = deltaparentrev |
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394 |
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395 # No guarantee the receiver has the delta parent. Send delta |
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396 # against last revision (if possible), which in the common case |
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397 # should be similar enough to this revision that the delta is |
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398 # reasonable. |
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399 elif prevrev is not None: |
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400 baserev = prevrev |
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401 else: |
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402 baserev = nullrev |
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403 |
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404 # Storage has a fulltext revision. |
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405 |
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406 # Let's use the previous revision, which is as good a guess as any. |
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407 # There is definitely room to improve this logic. |
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408 elif prevrev is not None: |
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409 baserev = prevrev |
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410 else: |
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411 baserev = nullrev |
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412 |
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413 # But we can't actually use our chosen delta base for whatever |
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414 # reason. Reset to fulltext. |
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415 if baserev != nullrev and (candeltafn and not candeltafn(baserev, rev)): |
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416 baserev = nullrev |
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417 |
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418 revision = None |
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419 delta = None |
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420 baserevisionsize = None |
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421 |
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422 if revisiondata: |
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423 if store.iscensored(baserev) or store.iscensored(rev): |
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424 try: |
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425 revision = store.revision(node, raw=True) |
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426 except error.CensoredNodeError as e: |
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427 revision = e.tombstone |
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428 |
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429 if baserev != nullrev: |
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430 if rawsizefn: |
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431 baserevisionsize = rawsizefn(baserev) |
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432 else: |
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433 baserevisionsize = len(store.revision(baserev, |
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434 raw=True)) |
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435 |
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436 elif (baserev == nullrev |
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437 and deltamode != repository.CG_DELTAMODE_PREV): |
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438 revision = store.revision(node, raw=True) |
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439 available.add(rev) |
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440 else: |
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441 if revdifffn: |
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442 delta = revdifffn(baserev, rev) |
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443 else: |
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444 delta = mdiff.textdiff(store.revision(baserev, raw=True), |
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445 store.revision(rev, raw=True)) |
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446 |
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447 available.add(rev) |
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448 |
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449 yield resultcls( |
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450 node=node, |
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451 p1node=fnode(p1rev), |
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452 p2node=fnode(p2rev), |
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453 basenode=fnode(baserev), |
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454 flags=flagsfn(rev) if flagsfn else 0, |
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455 baserevisionsize=baserevisionsize, |
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456 revision=revision, |
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457 delta=delta) |
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458 |
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459 prevrev = rev |
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460 |
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461 def deltaiscensored(delta, baserev, baselenfn): |
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462 """Determine if a delta represents censored revision data. |
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463 |
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464 ``baserev`` is the base revision this delta is encoded against. |
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465 ``baselenfn`` is a callable receiving a revision number that resolves the |
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466 length of the revision fulltext. |
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467 |
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468 Returns a bool indicating if the result of the delta represents a censored |
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469 revision. |
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470 """ |
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471 # Fragile heuristic: unless new file meta keys are added alphabetically |
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472 # preceding "censored", all censored revisions are prefixed by |
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473 # "\1\ncensored:". A delta producing such a censored revision must be a |
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474 # full-replacement delta, so we inspect the first and only patch in the |
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475 # delta for this prefix. |
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476 hlen = struct.calcsize(">lll") |
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477 if len(delta) <= hlen: |
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478 return False |
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479 |
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480 oldlen = baselenfn(baserev) |
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481 newlen = len(delta) - hlen |
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482 if delta[:hlen] != mdiff.replacediffheader(oldlen, newlen): |
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483 return False |
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484 |
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485 add = "\1\ncensored:" |
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486 addlen = len(add) |
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487 return newlen >= addlen and delta[hlen:hlen + addlen] == add |