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@@ -1,895 +1,899 b'' | |||
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1 | 1 | # revlogdeltas.py - Logic around delta computation for revlog |
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2 | 2 | # |
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3 | 3 | # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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4 | 4 | # Copyright 2018 Octobus <contact@octobus.net> |
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5 | 5 | # |
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6 | 6 | # This software may be used and distributed according to the terms of the |
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7 | 7 | # GNU General Public License version 2 or any later version. |
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8 | 8 | """Helper class to compute deltas stored inside revlogs""" |
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9 | 9 | |
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10 | 10 | from __future__ import absolute_import |
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11 | 11 | |
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12 | 12 | import collections |
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13 | 13 | import struct |
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14 | 14 | |
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15 | 15 | # import stuff from node for others to import from revlog |
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16 | 16 | from ..node import ( |
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17 | 17 | nullrev, |
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18 | 18 | ) |
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19 | 19 | from ..i18n import _ |
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20 | 20 | |
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21 | 21 | from .constants import ( |
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22 | 22 | REVIDX_ISCENSORED, |
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23 | 23 | REVIDX_RAWTEXT_CHANGING_FLAGS, |
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24 | 24 | ) |
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25 | 25 | |
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26 | 26 | from ..thirdparty import ( |
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27 | 27 | attr, |
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28 | 28 | ) |
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29 | 29 | |
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30 | 30 | from .. import ( |
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31 | 31 | error, |
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32 | 32 | mdiff, |
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33 | 33 | ) |
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34 | 34 | |
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35 | 35 | # maximum <delta-chain-data>/<revision-text-length> ratio |
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36 | 36 | LIMIT_DELTA2TEXT = 2 |
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37 | 37 | |
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38 | 38 | class _testrevlog(object): |
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39 | 39 | """minimalist fake revlog to use in doctests""" |
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40 | 40 | |
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41 | def __init__(self, data, density=0.5, mingap=0): | |
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41 | def __init__(self, data, density=0.5, mingap=0, snapshot=()): | |
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42 | 42 | """data is an list of revision payload boundaries""" |
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43 | 43 | self._data = data |
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44 | 44 | self._srdensitythreshold = density |
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45 | 45 | self._srmingapsize = mingap |
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46 | self._snapshot = set(snapshot) | |
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46 | 47 | |
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47 | 48 | def start(self, rev): |
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48 | 49 | if rev == 0: |
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49 | 50 | return 0 |
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50 | 51 | return self._data[rev - 1] |
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51 | 52 | |
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52 | 53 | def end(self, rev): |
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53 | 54 | return self._data[rev] |
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54 | 55 | |
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55 | 56 | def length(self, rev): |
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56 | 57 | return self.end(rev) - self.start(rev) |
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57 | 58 | |
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58 | 59 | def __len__(self): |
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59 | 60 | return len(self._data) |
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60 | 61 | |
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62 | def issnapshot(self, rev): | |
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63 | return rev in self._snapshot | |
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64 | ||
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61 | 65 | def slicechunk(revlog, revs, targetsize=None): |
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62 | 66 | """slice revs to reduce the amount of unrelated data to be read from disk. |
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63 | 67 | |
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64 | 68 | ``revs`` is sliced into groups that should be read in one time. |
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65 | 69 | Assume that revs are sorted. |
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66 | 70 | |
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67 | 71 | The initial chunk is sliced until the overall density (payload/chunks-span |
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68 | 72 | ratio) is above `revlog._srdensitythreshold`. No gap smaller than |
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69 | 73 | `revlog._srmingapsize` is skipped. |
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70 | 74 | |
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71 | 75 | If `targetsize` is set, no chunk larger than `targetsize` will be yield. |
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72 | 76 | For consistency with other slicing choice, this limit won't go lower than |
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73 | 77 | `revlog._srmingapsize`. |
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74 | 78 | |
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75 | 79 | If individual revisions chunk are larger than this limit, they will still |
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76 | 80 | be raised individually. |
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77 | 81 | |
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78 | 82 | >>> revlog = _testrevlog([ |
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79 | 83 | ... 5, #00 (5) |
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80 | 84 | ... 10, #01 (5) |
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81 | 85 | ... 12, #02 (2) |
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82 | 86 | ... 12, #03 (empty) |
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83 | 87 | ... 27, #04 (15) |
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84 | 88 | ... 31, #05 (4) |
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85 | 89 | ... 31, #06 (empty) |
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86 | 90 | ... 42, #07 (11) |
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87 | 91 | ... 47, #08 (5) |
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88 | 92 | ... 47, #09 (empty) |
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89 | 93 | ... 48, #10 (1) |
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90 | 94 | ... 51, #11 (3) |
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91 | 95 | ... 74, #12 (23) |
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92 | 96 | ... 85, #13 (11) |
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93 | 97 | ... 86, #14 (1) |
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94 | 98 | ... 91, #15 (5) |
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95 | 99 | ... ]) |
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96 | 100 | |
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97 | 101 | >>> list(slicechunk(revlog, list(range(16)))) |
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98 | 102 | [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]] |
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99 | 103 | >>> list(slicechunk(revlog, [0, 15])) |
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100 | 104 | [[0], [15]] |
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101 | 105 | >>> list(slicechunk(revlog, [0, 11, 15])) |
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102 | 106 | [[0], [11], [15]] |
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103 | 107 | >>> list(slicechunk(revlog, [0, 11, 13, 15])) |
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104 | 108 | [[0], [11, 13, 15]] |
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105 | 109 | >>> list(slicechunk(revlog, [1, 2, 3, 5, 8, 10, 11, 14])) |
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106 | 110 | [[1, 2], [5, 8, 10, 11], [14]] |
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107 | 111 | |
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108 | 112 | Slicing with a maximum chunk size |
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109 | 113 | >>> list(slicechunk(revlog, [0, 11, 13, 15], targetsize=15)) |
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110 | 114 | [[0], [11], [13], [15]] |
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111 | 115 | >>> list(slicechunk(revlog, [0, 11, 13, 15], targetsize=20)) |
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112 | 116 | [[0], [11], [13, 15]] |
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113 | 117 | """ |
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114 | 118 | if targetsize is not None: |
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115 | 119 | targetsize = max(targetsize, revlog._srmingapsize) |
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116 | 120 | # targetsize should not be specified when evaluating delta candidates: |
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117 | 121 | # * targetsize is used to ensure we stay within specification when reading, |
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118 | 122 | for chunk in _slicechunktodensity(revlog, revs, |
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119 | 123 | revlog._srdensitythreshold, |
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120 | 124 | revlog._srmingapsize): |
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121 | 125 | for subchunk in _slicechunktosize(revlog, chunk, targetsize): |
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122 | 126 | yield subchunk |
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123 | 127 | |
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124 | 128 | def _slicechunktosize(revlog, revs, targetsize=None): |
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125 | 129 | """slice revs to match the target size |
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126 | 130 | |
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127 | 131 | This is intended to be used on chunk that density slicing selected by that |
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128 | 132 | are still too large compared to the read garantee of revlog. This might |
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129 | 133 | happens when "minimal gap size" interrupted the slicing or when chain are |
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130 | 134 | built in a way that create large blocks next to each other. |
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131 | 135 | |
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132 | 136 | >>> revlog = _testrevlog([ |
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133 | 137 | ... 3, #0 (3) |
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134 | 138 | ... 5, #1 (2) |
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135 | 139 | ... 6, #2 (1) |
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136 | 140 | ... 8, #3 (2) |
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137 | 141 | ... 8, #4 (empty) |
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138 | 142 | ... 11, #5 (3) |
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139 | 143 | ... 12, #6 (1) |
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140 | 144 | ... 13, #7 (1) |
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141 | 145 | ... 14, #8 (1) |
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142 | 146 | ... ]) |
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143 | 147 | |
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144 | 148 | Cases where chunk is already small enough |
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145 | 149 | >>> list(_slicechunktosize(revlog, [0], 3)) |
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146 | 150 | [[0]] |
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147 | 151 | >>> list(_slicechunktosize(revlog, [6, 7], 3)) |
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148 | 152 | [[6, 7]] |
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149 | 153 | >>> list(_slicechunktosize(revlog, [0], None)) |
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150 | 154 | [[0]] |
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151 | 155 | >>> list(_slicechunktosize(revlog, [6, 7], None)) |
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152 | 156 | [[6, 7]] |
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153 | 157 | |
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154 | 158 | cases where we need actual slicing |
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155 | 159 | >>> list(_slicechunktosize(revlog, [0, 1], 3)) |
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156 | 160 | [[0], [1]] |
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157 | 161 | >>> list(_slicechunktosize(revlog, [1, 3], 3)) |
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158 | 162 | [[1], [3]] |
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159 | 163 | >>> list(_slicechunktosize(revlog, [1, 2, 3], 3)) |
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160 | 164 | [[1, 2], [3]] |
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161 | 165 | >>> list(_slicechunktosize(revlog, [3, 5], 3)) |
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162 | 166 | [[3], [5]] |
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163 | 167 | >>> list(_slicechunktosize(revlog, [3, 4, 5], 3)) |
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164 | 168 | [[3], [5]] |
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165 | 169 | >>> list(_slicechunktosize(revlog, [5, 6, 7, 8], 3)) |
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166 | 170 | [[5], [6, 7, 8]] |
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167 | 171 | >>> list(_slicechunktosize(revlog, [0, 1, 2, 3, 4, 5, 6, 7, 8], 3)) |
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168 | 172 | [[0], [1, 2], [3], [5], [6, 7, 8]] |
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169 | 173 | |
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170 | 174 | Case with too large individual chunk (must return valid chunk) |
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171 | 175 | >>> list(_slicechunktosize(revlog, [0, 1], 2)) |
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172 | 176 | [[0], [1]] |
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173 | 177 | >>> list(_slicechunktosize(revlog, [1, 3], 1)) |
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174 | 178 | [[1], [3]] |
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175 | 179 | >>> list(_slicechunktosize(revlog, [3, 4, 5], 2)) |
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176 | 180 | [[3], [5]] |
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177 | 181 | """ |
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178 | 182 | assert targetsize is None or 0 <= targetsize |
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179 | 183 | if targetsize is None or segmentspan(revlog, revs) <= targetsize: |
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180 | 184 | yield revs |
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181 | 185 | return |
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182 | 186 | |
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183 | 187 | startrevidx = 0 |
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184 | 188 | startdata = revlog.start(revs[0]) |
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185 | 189 | endrevidx = 0 |
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186 | 190 | iterrevs = enumerate(revs) |
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187 | 191 | next(iterrevs) # skip first rev. |
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188 | 192 | for idx, r in iterrevs: |
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189 | 193 | span = revlog.end(r) - startdata |
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190 | 194 | if span <= targetsize: |
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191 | 195 | endrevidx = idx |
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192 | 196 | else: |
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193 | 197 | chunk = _trimchunk(revlog, revs, startrevidx, endrevidx + 1) |
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194 | 198 | if chunk: |
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195 | 199 | yield chunk |
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196 | 200 | startrevidx = idx |
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197 | 201 | startdata = revlog.start(r) |
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198 | 202 | endrevidx = idx |
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199 | 203 | yield _trimchunk(revlog, revs, startrevidx) |
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200 | 204 | |
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201 | 205 | def _slicechunktodensity(revlog, revs, targetdensity=0.5, |
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202 | 206 | mingapsize=0): |
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203 | 207 | """slice revs to reduce the amount of unrelated data to be read from disk. |
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204 | 208 | |
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205 | 209 | ``revs`` is sliced into groups that should be read in one time. |
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206 | 210 | Assume that revs are sorted. |
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207 | 211 | |
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208 | 212 | The initial chunk is sliced until the overall density (payload/chunks-span |
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209 | 213 | ratio) is above `targetdensity`. No gap smaller than `mingapsize` is |
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210 | 214 | skipped. |
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211 | 215 | |
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212 | 216 | >>> revlog = _testrevlog([ |
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213 | 217 | ... 5, #00 (5) |
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214 | 218 | ... 10, #01 (5) |
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215 | 219 | ... 12, #02 (2) |
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216 | 220 | ... 12, #03 (empty) |
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217 | 221 | ... 27, #04 (15) |
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218 | 222 | ... 31, #05 (4) |
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219 | 223 | ... 31, #06 (empty) |
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220 | 224 | ... 42, #07 (11) |
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221 | 225 | ... 47, #08 (5) |
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222 | 226 | ... 47, #09 (empty) |
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223 | 227 | ... 48, #10 (1) |
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224 | 228 | ... 51, #11 (3) |
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225 | 229 | ... 74, #12 (23) |
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226 | 230 | ... 85, #13 (11) |
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227 | 231 | ... 86, #14 (1) |
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228 | 232 | ... 91, #15 (5) |
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229 | 233 | ... ]) |
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230 | 234 | |
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231 | 235 | >>> list(_slicechunktodensity(revlog, list(range(16)))) |
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232 | 236 | [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]] |
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233 | 237 | >>> list(_slicechunktodensity(revlog, [0, 15])) |
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234 | 238 | [[0], [15]] |
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235 | 239 | >>> list(_slicechunktodensity(revlog, [0, 11, 15])) |
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236 | 240 | [[0], [11], [15]] |
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237 | 241 | >>> list(_slicechunktodensity(revlog, [0, 11, 13, 15])) |
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238 | 242 | [[0], [11, 13, 15]] |
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239 | 243 | >>> list(_slicechunktodensity(revlog, [1, 2, 3, 5, 8, 10, 11, 14])) |
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240 | 244 | [[1, 2], [5, 8, 10, 11], [14]] |
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241 | 245 | >>> list(_slicechunktodensity(revlog, [1, 2, 3, 5, 8, 10, 11, 14], |
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242 | 246 | ... mingapsize=20)) |
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243 | 247 | [[1, 2, 3, 5, 8, 10, 11], [14]] |
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244 | 248 | >>> list(_slicechunktodensity(revlog, [1, 2, 3, 5, 8, 10, 11, 14], |
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245 | 249 | ... targetdensity=0.95)) |
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246 | 250 | [[1, 2], [5], [8, 10, 11], [14]] |
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247 | 251 | >>> list(_slicechunktodensity(revlog, [1, 2, 3, 5, 8, 10, 11, 14], |
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248 | 252 | ... targetdensity=0.95, mingapsize=12)) |
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249 | 253 | [[1, 2], [5, 8, 10, 11], [14]] |
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250 | 254 | """ |
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251 | 255 | start = revlog.start |
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252 | 256 | length = revlog.length |
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253 | 257 | |
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254 | 258 | if len(revs) <= 1: |
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255 | 259 | yield revs |
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256 | 260 | return |
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257 | 261 | |
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258 | 262 | deltachainspan = segmentspan(revlog, revs) |
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259 | 263 | |
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260 | 264 | if deltachainspan < mingapsize: |
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261 | 265 | yield revs |
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262 | 266 | return |
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263 | 267 | |
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264 | 268 | readdata = deltachainspan |
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265 | 269 | chainpayload = sum(length(r) for r in revs) |
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266 | 270 | |
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267 | 271 | if deltachainspan: |
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268 | 272 | density = chainpayload / float(deltachainspan) |
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269 | 273 | else: |
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270 | 274 | density = 1.0 |
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271 | 275 | |
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272 | 276 | if density >= targetdensity: |
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273 | 277 | yield revs |
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274 | 278 | return |
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275 | 279 | |
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276 | 280 | # Store the gaps in a heap to have them sorted by decreasing size |
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277 | 281 | gaps = [] |
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278 | 282 | prevend = None |
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279 | 283 | for i, rev in enumerate(revs): |
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280 | 284 | revstart = start(rev) |
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281 | 285 | revlen = length(rev) |
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282 | 286 | |
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283 | 287 | # Skip empty revisions to form larger holes |
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284 | 288 | if revlen == 0: |
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285 | 289 | continue |
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286 | 290 | |
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287 | 291 | if prevend is not None: |
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288 | 292 | gapsize = revstart - prevend |
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289 | 293 | # only consider holes that are large enough |
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290 | 294 | if gapsize > mingapsize: |
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291 | 295 | gaps.append((gapsize, i)) |
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292 | 296 | |
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293 | 297 | prevend = revstart + revlen |
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294 | 298 | # sort the gaps to pop them from largest to small |
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295 | 299 | gaps.sort() |
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296 | 300 | |
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297 | 301 | # Collect the indices of the largest holes until the density is acceptable |
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298 | 302 | selected = [] |
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299 | 303 | while gaps and density < targetdensity: |
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300 | 304 | gapsize, gapidx = gaps.pop() |
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301 | 305 | |
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302 | 306 | selected.append(gapidx) |
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303 | 307 | |
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304 | 308 | # the gap sizes are stored as negatives to be sorted decreasingly |
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305 | 309 | # by the heap |
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306 | 310 | readdata -= gapsize |
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307 | 311 | if readdata > 0: |
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308 | 312 | density = chainpayload / float(readdata) |
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309 | 313 | else: |
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310 | 314 | density = 1.0 |
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311 | 315 | selected.sort() |
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312 | 316 | |
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313 | 317 | # Cut the revs at collected indices |
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314 | 318 | previdx = 0 |
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315 | 319 | for idx in selected: |
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316 | 320 | |
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317 | 321 | chunk = _trimchunk(revlog, revs, previdx, idx) |
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318 | 322 | if chunk: |
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319 | 323 | yield chunk |
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320 | 324 | |
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321 | 325 | previdx = idx |
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322 | 326 | |
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323 | 327 | chunk = _trimchunk(revlog, revs, previdx) |
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324 | 328 | if chunk: |
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325 | 329 | yield chunk |
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326 | 330 | |
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327 | 331 | def _trimchunk(revlog, revs, startidx, endidx=None): |
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328 | 332 | """returns revs[startidx:endidx] without empty trailing revs |
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329 | 333 | |
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330 | 334 | Doctest Setup |
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331 | 335 | >>> revlog = _testrevlog([ |
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332 | 336 | ... 5, #0 |
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333 | 337 | ... 10, #1 |
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334 | 338 | ... 12, #2 |
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335 | 339 | ... 12, #3 (empty) |
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336 | 340 | ... 17, #4 |
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337 | 341 | ... 21, #5 |
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338 | 342 | ... 21, #6 (empty) |
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339 | 343 | ... ]) |
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340 | 344 | |
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341 | 345 | Contiguous cases: |
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342 | 346 | >>> _trimchunk(revlog, [0, 1, 2, 3, 4, 5, 6], 0) |
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343 | 347 | [0, 1, 2, 3, 4, 5] |
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344 | 348 | >>> _trimchunk(revlog, [0, 1, 2, 3, 4, 5, 6], 0, 5) |
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345 | 349 | [0, 1, 2, 3, 4] |
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346 | 350 | >>> _trimchunk(revlog, [0, 1, 2, 3, 4, 5, 6], 0, 4) |
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347 | 351 | [0, 1, 2] |
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348 | 352 | >>> _trimchunk(revlog, [0, 1, 2, 3, 4, 5, 6], 2, 4) |
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349 | 353 | [2] |
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350 | 354 | >>> _trimchunk(revlog, [0, 1, 2, 3, 4, 5, 6], 3) |
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351 | 355 | [3, 4, 5] |
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352 | 356 | >>> _trimchunk(revlog, [0, 1, 2, 3, 4, 5, 6], 3, 5) |
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353 | 357 | [3, 4] |
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354 | 358 | |
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355 | 359 | Discontiguous cases: |
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356 | 360 | >>> _trimchunk(revlog, [1, 3, 5, 6], 0) |
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357 | 361 | [1, 3, 5] |
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358 | 362 | >>> _trimchunk(revlog, [1, 3, 5, 6], 0, 2) |
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359 | 363 | [1] |
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360 | 364 | >>> _trimchunk(revlog, [1, 3, 5, 6], 1, 3) |
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361 | 365 | [3, 5] |
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362 | 366 | >>> _trimchunk(revlog, [1, 3, 5, 6], 1) |
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363 | 367 | [3, 5] |
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364 | 368 | """ |
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365 | 369 | length = revlog.length |
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366 | 370 | |
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367 | 371 | if endidx is None: |
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368 | 372 | endidx = len(revs) |
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369 | 373 | |
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370 | 374 | # If we have a non-emtpy delta candidate, there are nothing to trim |
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371 | 375 | if revs[endidx - 1] < len(revlog): |
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372 | 376 | # Trim empty revs at the end, except the very first revision of a chain |
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373 | 377 | while (endidx > 1 |
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374 | 378 | and endidx > startidx |
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375 | 379 | and length(revs[endidx - 1]) == 0): |
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376 | 380 | endidx -= 1 |
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377 | 381 | |
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378 | 382 | return revs[startidx:endidx] |
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379 | 383 | |
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380 | 384 | def segmentspan(revlog, revs): |
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381 | 385 | """Get the byte span of a segment of revisions |
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382 | 386 | |
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383 | 387 | revs is a sorted array of revision numbers |
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384 | 388 | |
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385 | 389 | >>> revlog = _testrevlog([ |
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386 | 390 | ... 5, #0 |
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387 | 391 | ... 10, #1 |
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388 | 392 | ... 12, #2 |
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389 | 393 | ... 12, #3 (empty) |
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390 | 394 | ... 17, #4 |
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391 | 395 | ... ]) |
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392 | 396 | |
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393 | 397 | >>> segmentspan(revlog, [0, 1, 2, 3, 4]) |
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394 | 398 | 17 |
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395 | 399 | >>> segmentspan(revlog, [0, 4]) |
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396 | 400 | 17 |
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397 | 401 | >>> segmentspan(revlog, [3, 4]) |
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398 | 402 | 5 |
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399 | 403 | >>> segmentspan(revlog, [1, 2, 3,]) |
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400 | 404 | 7 |
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401 | 405 | >>> segmentspan(revlog, [1, 3]) |
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402 | 406 | 7 |
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403 | 407 | """ |
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404 | 408 | if not revs: |
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405 | 409 | return 0 |
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406 | 410 | end = revlog.end(revs[-1]) |
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407 | 411 | return end - revlog.start(revs[0]) |
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408 | 412 | |
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409 | 413 | def _textfromdelta(fh, revlog, baserev, delta, p1, p2, flags, expectednode): |
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410 | 414 | """build full text from a (base, delta) pair and other metadata""" |
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411 | 415 | # special case deltas which replace entire base; no need to decode |
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412 | 416 | # base revision. this neatly avoids censored bases, which throw when |
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413 | 417 | # they're decoded. |
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414 | 418 | hlen = struct.calcsize(">lll") |
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415 | 419 | if delta[:hlen] == mdiff.replacediffheader(revlog.rawsize(baserev), |
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416 | 420 | len(delta) - hlen): |
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417 | 421 | fulltext = delta[hlen:] |
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418 | 422 | else: |
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419 | 423 | # deltabase is rawtext before changed by flag processors, which is |
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420 | 424 | # equivalent to non-raw text |
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421 | 425 | basetext = revlog.revision(baserev, _df=fh, raw=False) |
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422 | 426 | fulltext = mdiff.patch(basetext, delta) |
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423 | 427 | |
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424 | 428 | try: |
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425 | 429 | res = revlog._processflags(fulltext, flags, 'read', raw=True) |
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426 | 430 | fulltext, validatehash = res |
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427 | 431 | if validatehash: |
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428 | 432 | revlog.checkhash(fulltext, expectednode, p1=p1, p2=p2) |
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429 | 433 | if flags & REVIDX_ISCENSORED: |
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430 | 434 | raise error.StorageError(_('node %s is not censored') % |
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431 | 435 | expectednode) |
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432 | 436 | except error.CensoredNodeError: |
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433 | 437 | # must pass the censored index flag to add censored revisions |
|
434 | 438 | if not flags & REVIDX_ISCENSORED: |
|
435 | 439 | raise |
|
436 | 440 | return fulltext |
|
437 | 441 | |
|
438 | 442 | @attr.s(slots=True, frozen=True) |
|
439 | 443 | class _deltainfo(object): |
|
440 | 444 | distance = attr.ib() |
|
441 | 445 | deltalen = attr.ib() |
|
442 | 446 | data = attr.ib() |
|
443 | 447 | base = attr.ib() |
|
444 | 448 | chainbase = attr.ib() |
|
445 | 449 | chainlen = attr.ib() |
|
446 | 450 | compresseddeltalen = attr.ib() |
|
447 | 451 | snapshotdepth = attr.ib() |
|
448 | 452 | |
|
449 | 453 | def isgooddeltainfo(revlog, deltainfo, revinfo): |
|
450 | 454 | """Returns True if the given delta is good. Good means that it is within |
|
451 | 455 | the disk span, disk size, and chain length bounds that we know to be |
|
452 | 456 | performant.""" |
|
453 | 457 | if deltainfo is None: |
|
454 | 458 | return False |
|
455 | 459 | |
|
456 | 460 | # - 'deltainfo.distance' is the distance from the base revision -- |
|
457 | 461 | # bounding it limits the amount of I/O we need to do. |
|
458 | 462 | # - 'deltainfo.compresseddeltalen' is the sum of the total size of |
|
459 | 463 | # deltas we need to apply -- bounding it limits the amount of CPU |
|
460 | 464 | # we consume. |
|
461 | 465 | |
|
462 | 466 | textlen = revinfo.textlen |
|
463 | 467 | defaultmax = textlen * 4 |
|
464 | 468 | maxdist = revlog._maxdeltachainspan |
|
465 | 469 | if not maxdist: |
|
466 | 470 | maxdist = deltainfo.distance # ensure the conditional pass |
|
467 | 471 | maxdist = max(maxdist, defaultmax) |
|
468 | 472 | |
|
469 | 473 | # Bad delta from read span: |
|
470 | 474 | # |
|
471 | 475 | # If the span of data read is larger than the maximum allowed. |
|
472 | 476 | # |
|
473 | 477 | # In the sparse-revlog case, we rely on the associated "sparse reading" |
|
474 | 478 | # to avoid issue related to the span of data. In theory, it would be |
|
475 | 479 | # possible to build pathological revlog where delta pattern would lead |
|
476 | 480 | # to too many reads. However, they do not happen in practice at all. So |
|
477 | 481 | # we skip the span check entirely. |
|
478 | 482 | if not revlog._sparserevlog and maxdist < deltainfo.distance: |
|
479 | 483 | return False |
|
480 | 484 | |
|
481 | 485 | # Bad delta from new delta size: |
|
482 | 486 | # |
|
483 | 487 | # If the delta size is larger than the target text, storing the |
|
484 | 488 | # delta will be inefficient. |
|
485 | 489 | if textlen < deltainfo.deltalen: |
|
486 | 490 | return False |
|
487 | 491 | |
|
488 | 492 | # Bad delta from cumulated payload size: |
|
489 | 493 | # |
|
490 | 494 | # If the sum of delta get larger than K * target text length. |
|
491 | 495 | if textlen * LIMIT_DELTA2TEXT < deltainfo.compresseddeltalen: |
|
492 | 496 | return False |
|
493 | 497 | |
|
494 | 498 | # Bad delta from chain length: |
|
495 | 499 | # |
|
496 | 500 | # If the number of delta in the chain gets too high. |
|
497 | 501 | if (revlog._maxchainlen |
|
498 | 502 | and revlog._maxchainlen < deltainfo.chainlen): |
|
499 | 503 | return False |
|
500 | 504 | |
|
501 | 505 | # bad delta from intermediate snapshot size limit |
|
502 | 506 | # |
|
503 | 507 | # If an intermediate snapshot size is higher than the limit. The |
|
504 | 508 | # limit exist to prevent endless chain of intermediate delta to be |
|
505 | 509 | # created. |
|
506 | 510 | if (deltainfo.snapshotdepth is not None and |
|
507 | 511 | (textlen >> deltainfo.snapshotdepth) < deltainfo.deltalen): |
|
508 | 512 | return False |
|
509 | 513 | |
|
510 | 514 | # bad delta if new intermediate snapshot is larger than the previous |
|
511 | 515 | # snapshot |
|
512 | 516 | if (deltainfo.snapshotdepth |
|
513 | 517 | and revlog.length(deltainfo.base) < deltainfo.deltalen): |
|
514 | 518 | return False |
|
515 | 519 | |
|
516 | 520 | return True |
|
517 | 521 | |
|
518 | 522 | def _candidategroups(revlog, textlen, p1, p2, cachedelta): |
|
519 | 523 | """Provides group of revision to be tested as delta base |
|
520 | 524 | |
|
521 | 525 | This top level function focus on emitting groups with unique and worthwhile |
|
522 | 526 | content. See _raw_candidate_groups for details about the group order. |
|
523 | 527 | """ |
|
524 | 528 | # should we try to build a delta? |
|
525 | 529 | if not (len(revlog) and revlog._storedeltachains): |
|
526 | 530 | yield None |
|
527 | 531 | return |
|
528 | 532 | |
|
529 | 533 | deltalength = revlog.length |
|
530 | 534 | deltaparent = revlog.deltaparent |
|
531 | 535 | good = None |
|
532 | 536 | |
|
533 | 537 | deltas_limit = textlen * LIMIT_DELTA2TEXT |
|
534 | 538 | |
|
535 | 539 | tested = set([nullrev]) |
|
536 | 540 | candidates = _refinedgroups(revlog, p1, p2, cachedelta) |
|
537 | 541 | while True: |
|
538 | 542 | temptative = candidates.send(good) |
|
539 | 543 | if temptative is None: |
|
540 | 544 | break |
|
541 | 545 | group = [] |
|
542 | 546 | for rev in temptative: |
|
543 | 547 | # skip over empty delta (no need to include them in a chain) |
|
544 | 548 | while (revlog._generaldelta |
|
545 | 549 | and not (rev == nullrev |
|
546 | 550 | or rev in tested |
|
547 | 551 | or deltalength(rev))): |
|
548 | 552 | tested.add(rev) |
|
549 | 553 | rev = deltaparent(rev) |
|
550 | 554 | # filter out revision we tested already |
|
551 | 555 | if rev in tested: |
|
552 | 556 | continue |
|
553 | 557 | tested.add(rev) |
|
554 | 558 | # filter out delta base that will never produce good delta |
|
555 | 559 | if deltas_limit < revlog.length(rev): |
|
556 | 560 | continue |
|
557 | 561 | # no need to try a delta against nullrev, this will be done as a |
|
558 | 562 | # last resort. |
|
559 | 563 | if rev == nullrev: |
|
560 | 564 | continue |
|
561 | 565 | # no delta for rawtext-changing revs (see "candelta" for why) |
|
562 | 566 | if revlog.flags(rev) & REVIDX_RAWTEXT_CHANGING_FLAGS: |
|
563 | 567 | continue |
|
564 | 568 | group.append(rev) |
|
565 | 569 | if group: |
|
566 | 570 | # XXX: in the sparse revlog case, group can become large, |
|
567 | 571 | # impacting performances. Some bounding or slicing mecanism |
|
568 | 572 | # would help to reduce this impact. |
|
569 | 573 | good = yield tuple(group) |
|
570 | 574 | yield None |
|
571 | 575 | |
|
572 | 576 | def _findsnapshots(revlog, cache, start_rev): |
|
573 | 577 | """find snapshot from start_rev to tip""" |
|
574 | 578 | deltaparent = revlog.deltaparent |
|
575 | 579 | issnapshot = revlog.issnapshot |
|
576 | 580 | for rev in revlog.revs(start_rev): |
|
577 | 581 | if issnapshot(rev): |
|
578 | 582 | cache[deltaparent(rev)].append(rev) |
|
579 | 583 | |
|
580 | 584 | def _refinedgroups(revlog, p1, p2, cachedelta): |
|
581 | 585 | good = None |
|
582 | 586 | # First we try to reuse a the delta contained in the bundle. |
|
583 | 587 | # (or from the source revlog) |
|
584 | 588 | # |
|
585 | 589 | # This logic only applies to general delta repositories and can be disabled |
|
586 | 590 | # through configuration. Disabling reuse source delta is useful when |
|
587 | 591 | # we want to make sure we recomputed "optimal" deltas. |
|
588 | 592 | if cachedelta and revlog._generaldelta and revlog._lazydeltabase: |
|
589 | 593 | # Assume what we received from the server is a good choice |
|
590 | 594 | # build delta will reuse the cache |
|
591 | 595 | good = yield (cachedelta[0],) |
|
592 | 596 | if good is not None: |
|
593 | 597 | yield None |
|
594 | 598 | return |
|
595 | 599 | for candidates in _rawgroups(revlog, p1, p2, cachedelta): |
|
596 | 600 | good = yield candidates |
|
597 | 601 | if good is not None: |
|
598 | 602 | break |
|
599 | 603 | |
|
600 | 604 | # If sparse revlog is enabled, we can try to refine the available deltas |
|
601 | 605 | if not revlog._sparserevlog: |
|
602 | 606 | yield None |
|
603 | 607 | return |
|
604 | 608 | |
|
605 | 609 | # if we have a refinable value, try to refine it |
|
606 | 610 | if good is not None and good not in (p1, p2) and revlog.issnapshot(good): |
|
607 | 611 | # refine snapshot down |
|
608 | 612 | previous = None |
|
609 | 613 | while previous != good: |
|
610 | 614 | previous = good |
|
611 | 615 | base = revlog.deltaparent(good) |
|
612 | 616 | if base == nullrev: |
|
613 | 617 | break |
|
614 | 618 | good = yield (base,) |
|
615 | 619 | # refine snapshot up |
|
616 | 620 | # |
|
617 | 621 | # XXX the _findsnapshots call can be expensive and is "duplicated" with |
|
618 | 622 | # the one done in `_rawgroups`. Once we start working on performance, |
|
619 | 623 | # we should make the two logics share this computation. |
|
620 | 624 | snapshots = collections.defaultdict(list) |
|
621 | 625 | _findsnapshots(revlog, snapshots, good + 1) |
|
622 | 626 | previous = None |
|
623 | 627 | while good != previous: |
|
624 | 628 | previous = good |
|
625 | 629 | children = tuple(sorted(c for c in snapshots[good])) |
|
626 | 630 | good = yield children |
|
627 | 631 | |
|
628 | 632 | # we have found nothing |
|
629 | 633 | yield None |
|
630 | 634 | |
|
631 | 635 | def _rawgroups(revlog, p1, p2, cachedelta): |
|
632 | 636 | """Provides group of revision to be tested as delta base |
|
633 | 637 | |
|
634 | 638 | This lower level function focus on emitting delta theorically interresting |
|
635 | 639 | without looking it any practical details. |
|
636 | 640 | |
|
637 | 641 | The group order aims at providing fast or small candidates first. |
|
638 | 642 | """ |
|
639 | 643 | gdelta = revlog._generaldelta |
|
640 | 644 | sparse = revlog._sparserevlog |
|
641 | 645 | curr = len(revlog) |
|
642 | 646 | prev = curr - 1 |
|
643 | 647 | deltachain = lambda rev: revlog._deltachain(rev)[0] |
|
644 | 648 | |
|
645 | 649 | if gdelta: |
|
646 | 650 | # exclude already lazy tested base if any |
|
647 | 651 | parents = [p for p in (p1, p2) if p != nullrev] |
|
648 | 652 | |
|
649 | 653 | if not revlog._deltabothparents and len(parents) == 2: |
|
650 | 654 | parents.sort() |
|
651 | 655 | # To minimize the chance of having to build a fulltext, |
|
652 | 656 | # pick first whichever parent is closest to us (max rev) |
|
653 | 657 | yield (parents[1],) |
|
654 | 658 | # then the other one (min rev) if the first did not fit |
|
655 | 659 | yield (parents[0],) |
|
656 | 660 | elif len(parents) > 0: |
|
657 | 661 | # Test all parents (1 or 2), and keep the best candidate |
|
658 | 662 | yield parents |
|
659 | 663 | |
|
660 | 664 | if sparse and parents: |
|
661 | 665 | snapshots = collections.defaultdict(list) # map: base-rev: snapshot-rev |
|
662 | 666 | # See if we can use an existing snapshot in the parent chains to use as |
|
663 | 667 | # a base for a new intermediate-snapshot |
|
664 | 668 | # |
|
665 | 669 | # search for snapshot in parents delta chain |
|
666 | 670 | # map: snapshot-level: snapshot-rev |
|
667 | 671 | parents_snaps = collections.defaultdict(set) |
|
668 | 672 | candidate_chains = [deltachain(p) for p in parents] |
|
669 | 673 | for chain in candidate_chains: |
|
670 | 674 | for idx, s in enumerate(chain): |
|
671 | 675 | if not revlog.issnapshot(s): |
|
672 | 676 | break |
|
673 | 677 | parents_snaps[idx].add(s) |
|
674 | 678 | snapfloor = min(parents_snaps[0]) + 1 |
|
675 | 679 | _findsnapshots(revlog, snapshots, snapfloor) |
|
676 | 680 | # search for the highest "unrelated" revision |
|
677 | 681 | # |
|
678 | 682 | # Adding snapshots used by "unrelated" revision increase the odd we |
|
679 | 683 | # reuse an independant, yet better snapshot chain. |
|
680 | 684 | # |
|
681 | 685 | # XXX instead of building a set of revisions, we could lazily enumerate |
|
682 | 686 | # over the chains. That would be more efficient, however we stick to |
|
683 | 687 | # simple code for now. |
|
684 | 688 | all_revs = set() |
|
685 | 689 | for chain in candidate_chains: |
|
686 | 690 | all_revs.update(chain) |
|
687 | 691 | other = None |
|
688 | 692 | for r in revlog.revs(prev, snapfloor): |
|
689 | 693 | if r not in all_revs: |
|
690 | 694 | other = r |
|
691 | 695 | break |
|
692 | 696 | if other is not None: |
|
693 | 697 | # To avoid unfair competition, we won't use unrelated intermediate |
|
694 | 698 | # snapshot that are deeper than the ones from the parent delta |
|
695 | 699 | # chain. |
|
696 | 700 | max_depth = max(parents_snaps.keys()) |
|
697 | 701 | chain = deltachain(other) |
|
698 | 702 | for idx, s in enumerate(chain): |
|
699 | 703 | if s < snapfloor: |
|
700 | 704 | continue |
|
701 | 705 | if max_depth < idx: |
|
702 | 706 | break |
|
703 | 707 | if not revlog.issnapshot(s): |
|
704 | 708 | break |
|
705 | 709 | parents_snaps[idx].add(s) |
|
706 | 710 | # Test them as possible intermediate snapshot base |
|
707 | 711 | # We test them from highest to lowest level. High level one are more |
|
708 | 712 | # likely to result in small delta |
|
709 | 713 | floor = None |
|
710 | 714 | for idx, snaps in sorted(parents_snaps.items(), reverse=True): |
|
711 | 715 | siblings = set() |
|
712 | 716 | for s in snaps: |
|
713 | 717 | siblings.update(snapshots[s]) |
|
714 | 718 | # Before considering making a new intermediate snapshot, we check |
|
715 | 719 | # if an existing snapshot, children of base we consider, would be |
|
716 | 720 | # suitable. |
|
717 | 721 | # |
|
718 | 722 | # It give a change to reuse a delta chain "unrelated" to the |
|
719 | 723 | # current revision instead of starting our own. Without such |
|
720 | 724 | # re-use, topological branches would keep reopening new chains. |
|
721 | 725 | # Creating more and more snapshot as the repository grow. |
|
722 | 726 | |
|
723 | 727 | if floor is not None: |
|
724 | 728 | # We only do this for siblings created after the one in our |
|
725 | 729 | # parent's delta chain. Those created before has less chances |
|
726 | 730 | # to be valid base since our ancestors had to create a new |
|
727 | 731 | # snapshot. |
|
728 | 732 | siblings = [r for r in siblings if floor < r] |
|
729 | 733 | yield tuple(sorted(siblings)) |
|
730 | 734 | # then test the base from our parent's delta chain. |
|
731 | 735 | yield tuple(sorted(snaps)) |
|
732 | 736 | floor = min(snaps) |
|
733 | 737 | # No suitable base found in the parent chain, search if any full |
|
734 | 738 | # snapshots emitted since parent's base would be a suitable base for an |
|
735 | 739 | # intermediate snapshot. |
|
736 | 740 | # |
|
737 | 741 | # It give a chance to reuse a delta chain unrelated to the current |
|
738 | 742 | # revisions instead of starting our own. Without such re-use, |
|
739 | 743 | # topological branches would keep reopening new full chains. Creating |
|
740 | 744 | # more and more snapshot as the repository grow. |
|
741 | 745 | yield tuple(snapshots[nullrev]) |
|
742 | 746 | |
|
743 | 747 | if not sparse: |
|
744 | 748 | # other approach failed try against prev to hopefully save us a |
|
745 | 749 | # fulltext. |
|
746 | 750 | yield (prev,) |
|
747 | 751 | |
|
748 | 752 | class deltacomputer(object): |
|
749 | 753 | def __init__(self, revlog): |
|
750 | 754 | self.revlog = revlog |
|
751 | 755 | |
|
752 | 756 | def buildtext(self, revinfo, fh): |
|
753 | 757 | """Builds a fulltext version of a revision |
|
754 | 758 | |
|
755 | 759 | revinfo: _revisioninfo instance that contains all needed info |
|
756 | 760 | fh: file handle to either the .i or the .d revlog file, |
|
757 | 761 | depending on whether it is inlined or not |
|
758 | 762 | """ |
|
759 | 763 | btext = revinfo.btext |
|
760 | 764 | if btext[0] is not None: |
|
761 | 765 | return btext[0] |
|
762 | 766 | |
|
763 | 767 | revlog = self.revlog |
|
764 | 768 | cachedelta = revinfo.cachedelta |
|
765 | 769 | baserev = cachedelta[0] |
|
766 | 770 | delta = cachedelta[1] |
|
767 | 771 | |
|
768 | 772 | fulltext = btext[0] = _textfromdelta(fh, revlog, baserev, delta, |
|
769 | 773 | revinfo.p1, revinfo.p2, |
|
770 | 774 | revinfo.flags, revinfo.node) |
|
771 | 775 | return fulltext |
|
772 | 776 | |
|
773 | 777 | def _builddeltadiff(self, base, revinfo, fh): |
|
774 | 778 | revlog = self.revlog |
|
775 | 779 | t = self.buildtext(revinfo, fh) |
|
776 | 780 | if revlog.iscensored(base): |
|
777 | 781 | # deltas based on a censored revision must replace the |
|
778 | 782 | # full content in one patch, so delta works everywhere |
|
779 | 783 | header = mdiff.replacediffheader(revlog.rawsize(base), len(t)) |
|
780 | 784 | delta = header + t |
|
781 | 785 | else: |
|
782 | 786 | ptext = revlog.revision(base, _df=fh, raw=True) |
|
783 | 787 | delta = mdiff.textdiff(ptext, t) |
|
784 | 788 | |
|
785 | 789 | return delta |
|
786 | 790 | |
|
787 | 791 | def _builddeltainfo(self, revinfo, base, fh): |
|
788 | 792 | # can we use the cached delta? |
|
789 | 793 | delta = None |
|
790 | 794 | if revinfo.cachedelta: |
|
791 | 795 | cachebase, cachediff = revinfo.cachedelta |
|
792 | 796 | #check if the diff still apply |
|
793 | 797 | currentbase = cachebase |
|
794 | 798 | while (currentbase != nullrev |
|
795 | 799 | and currentbase != base |
|
796 | 800 | and self.revlog.length(currentbase) == 0): |
|
797 | 801 | currentbase = self.revlog.deltaparent(currentbase) |
|
798 | 802 | if currentbase == base: |
|
799 | 803 | delta = revinfo.cachedelta[1] |
|
800 | 804 | if delta is None: |
|
801 | 805 | delta = self._builddeltadiff(base, revinfo, fh) |
|
802 | 806 | revlog = self.revlog |
|
803 | 807 | header, data = revlog.compress(delta) |
|
804 | 808 | deltalen = len(header) + len(data) |
|
805 | 809 | chainbase = revlog.chainbase(base) |
|
806 | 810 | offset = revlog.end(len(revlog) - 1) |
|
807 | 811 | dist = deltalen + offset - revlog.start(chainbase) |
|
808 | 812 | if revlog._generaldelta: |
|
809 | 813 | deltabase = base |
|
810 | 814 | else: |
|
811 | 815 | deltabase = chainbase |
|
812 | 816 | chainlen, compresseddeltalen = revlog._chaininfo(base) |
|
813 | 817 | chainlen += 1 |
|
814 | 818 | compresseddeltalen += deltalen |
|
815 | 819 | |
|
816 | 820 | revlog = self.revlog |
|
817 | 821 | snapshotdepth = None |
|
818 | 822 | if deltabase == nullrev: |
|
819 | 823 | snapshotdepth = 0 |
|
820 | 824 | elif revlog._sparserevlog and revlog.issnapshot(deltabase): |
|
821 | 825 | # A delta chain should always be one full snapshot, |
|
822 | 826 | # zero or more semi-snapshots, and zero or more deltas |
|
823 | 827 | p1, p2 = revlog.rev(revinfo.p1), revlog.rev(revinfo.p2) |
|
824 | 828 | if deltabase not in (p1, p2) and revlog.issnapshot(deltabase): |
|
825 | 829 | snapshotdepth = len(revlog._deltachain(deltabase)[0]) |
|
826 | 830 | |
|
827 | 831 | return _deltainfo(dist, deltalen, (header, data), deltabase, |
|
828 | 832 | chainbase, chainlen, compresseddeltalen, |
|
829 | 833 | snapshotdepth) |
|
830 | 834 | |
|
831 | 835 | def _fullsnapshotinfo(self, fh, revinfo): |
|
832 | 836 | curr = len(self.revlog) |
|
833 | 837 | rawtext = self.buildtext(revinfo, fh) |
|
834 | 838 | data = self.revlog.compress(rawtext) |
|
835 | 839 | compresseddeltalen = deltalen = dist = len(data[1]) + len(data[0]) |
|
836 | 840 | deltabase = chainbase = curr |
|
837 | 841 | snapshotdepth = 0 |
|
838 | 842 | chainlen = 1 |
|
839 | 843 | |
|
840 | 844 | return _deltainfo(dist, deltalen, data, deltabase, |
|
841 | 845 | chainbase, chainlen, compresseddeltalen, |
|
842 | 846 | snapshotdepth) |
|
843 | 847 | |
|
844 | 848 | def finddeltainfo(self, revinfo, fh): |
|
845 | 849 | """Find an acceptable delta against a candidate revision |
|
846 | 850 | |
|
847 | 851 | revinfo: information about the revision (instance of _revisioninfo) |
|
848 | 852 | fh: file handle to either the .i or the .d revlog file, |
|
849 | 853 | depending on whether it is inlined or not |
|
850 | 854 | |
|
851 | 855 | Returns the first acceptable candidate revision, as ordered by |
|
852 | 856 | _candidategroups |
|
853 | 857 | |
|
854 | 858 | If no suitable deltabase is found, we return delta info for a full |
|
855 | 859 | snapshot. |
|
856 | 860 | """ |
|
857 | 861 | if not revinfo.textlen: |
|
858 | 862 | return self._fullsnapshotinfo(fh, revinfo) |
|
859 | 863 | |
|
860 | 864 | # no delta for flag processor revision (see "candelta" for why) |
|
861 | 865 | # not calling candelta since only one revision needs test, also to |
|
862 | 866 | # avoid overhead fetching flags again. |
|
863 | 867 | if revinfo.flags & REVIDX_RAWTEXT_CHANGING_FLAGS: |
|
864 | 868 | return self._fullsnapshotinfo(fh, revinfo) |
|
865 | 869 | |
|
866 | 870 | cachedelta = revinfo.cachedelta |
|
867 | 871 | p1 = revinfo.p1 |
|
868 | 872 | p2 = revinfo.p2 |
|
869 | 873 | revlog = self.revlog |
|
870 | 874 | |
|
871 | 875 | deltainfo = None |
|
872 | 876 | p1r, p2r = revlog.rev(p1), revlog.rev(p2) |
|
873 | 877 | groups = _candidategroups(self.revlog, revinfo.textlen, |
|
874 | 878 | p1r, p2r, cachedelta) |
|
875 | 879 | candidaterevs = next(groups) |
|
876 | 880 | while candidaterevs is not None: |
|
877 | 881 | nominateddeltas = [] |
|
878 | 882 | if deltainfo is not None: |
|
879 | 883 | # if we already found a good delta, |
|
880 | 884 | # challenge it against refined candidates |
|
881 | 885 | nominateddeltas.append(deltainfo) |
|
882 | 886 | for candidaterev in candidaterevs: |
|
883 | 887 | candidatedelta = self._builddeltainfo(revinfo, candidaterev, fh) |
|
884 | 888 | if isgooddeltainfo(self.revlog, candidatedelta, revinfo): |
|
885 | 889 | nominateddeltas.append(candidatedelta) |
|
886 | 890 | if nominateddeltas: |
|
887 | 891 | deltainfo = min(nominateddeltas, key=lambda x: x.deltalen) |
|
888 | 892 | if deltainfo is not None: |
|
889 | 893 | candidaterevs = groups.send(deltainfo.base) |
|
890 | 894 | else: |
|
891 | 895 | candidaterevs = next(groups) |
|
892 | 896 | |
|
893 | 897 | if deltainfo is None: |
|
894 | 898 | deltainfo = self._fullsnapshotinfo(fh, revinfo) |
|
895 | 899 | return deltainfo |
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