Mercurial > hg
annotate hgext/remotefilelog/basepack.py @ 40675:9fcf8084ada8
py3: use node.hex(m.digest()) instead of m.hexdigest()
hashlib.sha1.hexdigest() returns str on Python 3.
Differential Revision: https://phab.mercurial-scm.org/D5287
author | Pulkit Goyal <pulkit@yandex-team.ru> |
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date | Mon, 19 Nov 2018 21:12:13 +0300 |
parents | aa588bf40a08 |
children | e0b485a76009 |
rev | line source |
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1 from __future__ import absolute_import |
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2 |
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3 import collections |
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4 import errno |
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5 import hashlib |
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6 import mmap |
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7 import os |
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8 import struct |
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9 import time |
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10 |
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11 from mercurial.i18n import _ |
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12 from mercurial import ( |
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13 node as nodemod, |
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14 policy, |
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15 pycompat, |
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16 util, |
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17 vfs as vfsmod, |
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18 ) |
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19 from . import shallowutil |
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20 |
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21 osutil = policy.importmod(r'osutil') |
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22 |
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23 # The pack version supported by this implementation. This will need to be |
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24 # rev'd whenever the byte format changes. Ex: changing the fanout prefix, |
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25 # changing any of the int sizes, changing the delta algorithm, etc. |
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26 PACKVERSIONSIZE = 1 |
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27 INDEXVERSIONSIZE = 2 |
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28 |
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29 FANOUTSTART = INDEXVERSIONSIZE |
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30 |
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31 # Constant that indicates a fanout table entry hasn't been filled in. (This does |
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32 # not get serialized) |
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33 EMPTYFANOUT = -1 |
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34 |
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35 # The fanout prefix is the number of bytes that can be addressed by the fanout |
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36 # table. Example: a fanout prefix of 1 means we use the first byte of a hash to |
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37 # look in the fanout table (which will be 2^8 entries long). |
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38 SMALLFANOUTPREFIX = 1 |
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39 LARGEFANOUTPREFIX = 2 |
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40 |
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41 # The number of entries in the index at which point we switch to a large fanout. |
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42 # It is chosen to balance the linear scan through a sparse fanout, with the |
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43 # size of the bisect in actual index. |
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44 # 2^16 / 8 was chosen because it trades off (1 step fanout scan + 5 step |
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45 # bisect) with (8 step fanout scan + 1 step bisect) |
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46 # 5 step bisect = log(2^16 / 8 / 255) # fanout |
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47 # 10 step fanout scan = 2^16 / (2^16 / 8) # fanout space divided by entries |
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48 SMALLFANOUTCUTOFF = 2**16 / 8 |
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49 |
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50 # The amount of time to wait between checking for new packs. This prevents an |
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51 # exception when data is moved to a new pack after the process has already |
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52 # loaded the pack list. |
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53 REFRESHRATE = 0.1 |
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54 |
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55 if pycompat.isposix: |
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56 # With glibc 2.7+ the 'e' flag uses O_CLOEXEC when opening. |
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57 # The 'e' flag will be ignored on older versions of glibc. |
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58 PACKOPENMODE = 'rbe' |
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59 else: |
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60 PACKOPENMODE = 'rb' |
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61 |
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62 class _cachebackedpacks(object): |
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63 def __init__(self, packs, cachesize): |
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64 self._packs = set(packs) |
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65 self._lrucache = util.lrucachedict(cachesize) |
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66 self._lastpack = None |
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67 |
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68 # Avoid cold start of the cache by populating the most recent packs |
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69 # in the cache. |
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70 for i in reversed(range(min(cachesize, len(packs)))): |
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71 self._movetofront(packs[i]) |
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72 |
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73 def _movetofront(self, pack): |
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74 # This effectively makes pack the first entry in the cache. |
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75 self._lrucache[pack] = True |
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76 |
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77 def _registerlastpackusage(self): |
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78 if self._lastpack is not None: |
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79 self._movetofront(self._lastpack) |
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80 self._lastpack = None |
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81 |
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82 def add(self, pack): |
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83 self._registerlastpackusage() |
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84 |
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85 # This method will mostly be called when packs are not in cache. |
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86 # Therefore, adding pack to the cache. |
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87 self._movetofront(pack) |
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88 self._packs.add(pack) |
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89 |
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90 def __iter__(self): |
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91 self._registerlastpackusage() |
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92 |
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93 # Cache iteration is based on LRU. |
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94 for pack in self._lrucache: |
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95 self._lastpack = pack |
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96 yield pack |
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97 |
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98 cachedpacks = set(pack for pack in self._lrucache) |
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99 # Yield for paths not in the cache. |
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100 for pack in self._packs - cachedpacks: |
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101 self._lastpack = pack |
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102 yield pack |
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103 |
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104 # Data not found in any pack. |
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105 self._lastpack = None |
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106 |
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107 class basepackstore(object): |
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108 # Default cache size limit for the pack files. |
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109 DEFAULTCACHESIZE = 100 |
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110 |
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111 def __init__(self, ui, path): |
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112 self.ui = ui |
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113 self.path = path |
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114 |
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115 # lastrefesh is 0 so we'll immediately check for new packs on the first |
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116 # failure. |
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117 self.lastrefresh = 0 |
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118 |
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119 packs = [] |
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120 for filepath, __, __ in self._getavailablepackfilessorted(): |
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121 try: |
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122 pack = self.getpack(filepath) |
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123 except Exception as ex: |
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124 # An exception may be thrown if the pack file is corrupted |
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125 # somehow. Log a warning but keep going in this case, just |
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126 # skipping this pack file. |
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127 # |
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128 # If this is an ENOENT error then don't even bother logging. |
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129 # Someone could have removed the file since we retrieved the |
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130 # list of paths. |
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131 if getattr(ex, 'errno', None) != errno.ENOENT: |
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132 ui.warn(_('unable to load pack %s: %s\n') % (filepath, ex)) |
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133 continue |
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134 packs.append(pack) |
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135 |
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136 self.packs = _cachebackedpacks(packs, self.DEFAULTCACHESIZE) |
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137 |
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138 def _getavailablepackfiles(self): |
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139 """For each pack file (a index/data file combo), yields: |
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140 (full path without extension, mtime, size) |
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141 |
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142 mtime will be the mtime of the index/data file (whichever is newer) |
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143 size is the combined size of index/data file |
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144 """ |
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145 indexsuffixlen = len(self.INDEXSUFFIX) |
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146 packsuffixlen = len(self.PACKSUFFIX) |
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147 |
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148 ids = set() |
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149 sizes = collections.defaultdict(lambda: 0) |
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150 mtimes = collections.defaultdict(lambda: []) |
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151 try: |
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152 for filename, type, stat in osutil.listdir(self.path, stat=True): |
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153 id = None |
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154 if filename[-indexsuffixlen:] == self.INDEXSUFFIX: |
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155 id = filename[:-indexsuffixlen] |
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156 elif filename[-packsuffixlen:] == self.PACKSUFFIX: |
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157 id = filename[:-packsuffixlen] |
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158 |
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159 # Since we expect to have two files corresponding to each ID |
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160 # (the index file and the pack file), we can yield once we see |
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161 # it twice. |
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162 if id: |
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163 sizes[id] += stat.st_size # Sum both files' sizes together |
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164 mtimes[id].append(stat.st_mtime) |
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165 if id in ids: |
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166 yield (os.path.join(self.path, id), max(mtimes[id]), |
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167 sizes[id]) |
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168 else: |
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169 ids.add(id) |
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170 except OSError as ex: |
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171 if ex.errno != errno.ENOENT: |
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172 raise |
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173 |
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174 def _getavailablepackfilessorted(self): |
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175 """Like `_getavailablepackfiles`, but also sorts the files by mtime, |
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176 yielding newest files first. |
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177 |
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178 This is desirable, since it is more likely newer packfiles have more |
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179 desirable data. |
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180 """ |
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181 files = [] |
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182 for path, mtime, size in self._getavailablepackfiles(): |
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183 files.append((mtime, size, path)) |
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184 files = sorted(files, reverse=True) |
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185 for mtime, size, path in files: |
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186 yield path, mtime, size |
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187 |
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188 def gettotalsizeandcount(self): |
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189 """Returns the total disk size (in bytes) of all the pack files in |
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190 this store, and the count of pack files. |
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191 |
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192 (This might be smaller than the total size of the ``self.path`` |
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193 directory, since this only considers fuly-writen pack files, and not |
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194 temporary files or other detritus on the directory.) |
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195 """ |
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196 totalsize = 0 |
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197 count = 0 |
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198 for __, __, size in self._getavailablepackfiles(): |
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199 totalsize += size |
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200 count += 1 |
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201 return totalsize, count |
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202 |
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203 def getmetrics(self): |
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204 """Returns metrics on the state of this store.""" |
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205 size, count = self.gettotalsizeandcount() |
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206 return { |
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207 'numpacks': count, |
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208 'totalpacksize': size, |
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209 } |
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210 |
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211 def getpack(self, path): |
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212 raise NotImplementedError() |
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213 |
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214 def getmissing(self, keys): |
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215 missing = keys |
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216 for pack in self.packs: |
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217 missing = pack.getmissing(missing) |
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218 |
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219 # Ensures better performance of the cache by keeping the most |
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220 # recently accessed pack at the beginning in subsequent iterations. |
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221 if not missing: |
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222 return missing |
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223 |
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224 if missing: |
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225 for pack in self.refresh(): |
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226 missing = pack.getmissing(missing) |
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227 |
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228 return missing |
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229 |
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230 def markledger(self, ledger, options=None): |
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231 for pack in self.packs: |
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232 pack.markledger(ledger) |
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233 |
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234 def markforrefresh(self): |
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235 """Tells the store that there may be new pack files, so the next time it |
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236 has a lookup miss it should check for new files.""" |
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237 self.lastrefresh = 0 |
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238 |
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239 def refresh(self): |
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240 """Checks for any new packs on disk, adds them to the main pack list, |
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241 and returns a list of just the new packs.""" |
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242 now = time.time() |
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243 |
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244 # If we experience a lot of misses (like in the case of getmissing() on |
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245 # new objects), let's only actually check disk for new stuff every once |
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246 # in a while. Generally this code path should only ever matter when a |
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247 # repack is going on in the background, and that should be pretty rare |
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248 # to have that happen twice in quick succession. |
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249 newpacks = [] |
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250 if now > self.lastrefresh + REFRESHRATE: |
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251 self.lastrefresh = now |
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252 previous = set(p.path for p in self.packs) |
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253 for filepath, __, __ in self._getavailablepackfilessorted(): |
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254 if filepath not in previous: |
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255 newpack = self.getpack(filepath) |
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256 newpacks.append(newpack) |
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257 self.packs.add(newpack) |
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258 |
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259 return newpacks |
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260 |
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261 class versionmixin(object): |
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262 # Mix-in for classes with multiple supported versions |
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263 VERSION = None |
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264 SUPPORTED_VERSIONS = [2] |
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265 |
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266 def _checkversion(self, version): |
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267 if version in self.SUPPORTED_VERSIONS: |
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268 if self.VERSION is None: |
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269 # only affect this instance |
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270 self.VERSION = version |
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271 elif self.VERSION != version: |
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272 raise RuntimeError('inconsistent version: %s' % version) |
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273 else: |
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274 raise RuntimeError('unsupported version: %s' % version) |
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275 |
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276 class basepack(versionmixin): |
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277 # The maximum amount we should read via mmap before remmaping so the old |
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278 # pages can be released (100MB) |
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279 MAXPAGEDIN = 100 * 1024**2 |
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280 |
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281 SUPPORTED_VERSIONS = [2] |
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282 |
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283 def __init__(self, path): |
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284 self.path = path |
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285 self.packpath = path + self.PACKSUFFIX |
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286 self.indexpath = path + self.INDEXSUFFIX |
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287 |
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288 self.indexsize = os.stat(self.indexpath).st_size |
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289 self.datasize = os.stat(self.packpath).st_size |
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290 |
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291 self._index = None |
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292 self._data = None |
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293 self.freememory() # initialize the mmap |
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294 |
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295 version = struct.unpack('!B', self._data[:PACKVERSIONSIZE])[0] |
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296 self._checkversion(version) |
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297 |
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298 version, config = struct.unpack('!BB', self._index[:INDEXVERSIONSIZE]) |
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299 self._checkversion(version) |
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300 |
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301 if 0b10000000 & config: |
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302 self.params = indexparams(LARGEFANOUTPREFIX, version) |
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303 else: |
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304 self.params = indexparams(SMALLFANOUTPREFIX, version) |
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305 |
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306 @util.propertycache |
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307 def _fanouttable(self): |
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308 params = self.params |
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309 rawfanout = self._index[FANOUTSTART:FANOUTSTART + params.fanoutsize] |
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310 fanouttable = [] |
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311 for i in pycompat.xrange(0, params.fanoutcount): |
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312 loc = i * 4 |
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313 fanoutentry = struct.unpack('!I', rawfanout[loc:loc + 4])[0] |
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314 fanouttable.append(fanoutentry) |
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315 return fanouttable |
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316 |
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317 @util.propertycache |
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318 def _indexend(self): |
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319 nodecount = struct.unpack_from('!Q', self._index, |
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320 self.params.indexstart - 8)[0] |
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321 return self.params.indexstart + nodecount * self.INDEXENTRYLENGTH |
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322 |
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323 def freememory(self): |
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324 """Unmap and remap the memory to free it up after known expensive |
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325 operations. Return True if self._data and self._index were reloaded. |
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326 """ |
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327 if self._index: |
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328 if self._pagedin < self.MAXPAGEDIN: |
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329 return False |
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330 |
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331 self._index.close() |
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332 self._data.close() |
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333 |
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334 # TODO: use an opener/vfs to access these paths |
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335 with open(self.indexpath, PACKOPENMODE) as indexfp: |
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336 # memory-map the file, size 0 means whole file |
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337 self._index = mmap.mmap(indexfp.fileno(), 0, |
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338 access=mmap.ACCESS_READ) |
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339 with open(self.packpath, PACKOPENMODE) as datafp: |
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340 self._data = mmap.mmap(datafp.fileno(), 0, access=mmap.ACCESS_READ) |
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341 |
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342 self._pagedin = 0 |
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343 return True |
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344 |
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345 def getmissing(self, keys): |
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346 raise NotImplementedError() |
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347 |
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348 def markledger(self, ledger, options=None): |
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349 raise NotImplementedError() |
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350 |
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351 def cleanup(self, ledger): |
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352 raise NotImplementedError() |
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353 |
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354 def __iter__(self): |
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355 raise NotImplementedError() |
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356 |
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357 def iterentries(self): |
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358 raise NotImplementedError() |
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359 |
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360 class mutablebasepack(versionmixin): |
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361 |
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362 def __init__(self, ui, packdir, version=2): |
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363 self._checkversion(version) |
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364 # TODO(augie): make this configurable |
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365 self._compressor = 'GZ' |
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366 opener = vfsmod.vfs(packdir) |
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367 opener.createmode = 0o444 |
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368 self.opener = opener |
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369 |
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370 self.entries = {} |
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371 |
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372 shallowutil.mkstickygroupdir(ui, packdir) |
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373 self.packfp, self.packpath = opener.mkstemp( |
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374 suffix=self.PACKSUFFIX + '-tmp') |
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375 self.idxfp, self.idxpath = opener.mkstemp( |
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376 suffix=self.INDEXSUFFIX + '-tmp') |
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377 self.packfp = os.fdopen(self.packfp, r'wb+') |
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378 self.idxfp = os.fdopen(self.idxfp, r'wb+') |
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379 self.sha = hashlib.sha1() |
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380 self._closed = False |
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381 |
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382 # The opener provides no way of doing permission fixup on files created |
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383 # via mkstemp, so we must fix it ourselves. We can probably fix this |
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384 # upstream in vfs.mkstemp so we don't need to use the private method. |
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385 opener._fixfilemode(opener.join(self.packpath)) |
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386 opener._fixfilemode(opener.join(self.idxpath)) |
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387 |
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388 # Write header |
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389 # TODO: make it extensible (ex: allow specifying compression algorithm, |
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390 # a flexible key/value header, delta algorithm, fanout size, etc) |
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391 versionbuf = struct.pack('!B', self.VERSION) # unsigned 1 byte int |
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392 self.writeraw(versionbuf) |
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393 |
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394 def __enter__(self): |
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395 return self |
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396 |
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397 def __exit__(self, exc_type, exc_value, traceback): |
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398 if exc_type is None: |
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399 self.close() |
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400 else: |
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401 self.abort() |
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402 |
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403 def abort(self): |
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404 # Unclean exit |
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405 self._cleantemppacks() |
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406 |
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407 def writeraw(self, data): |
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408 self.packfp.write(data) |
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409 self.sha.update(data) |
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410 |
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411 def close(self, ledger=None): |
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412 if self._closed: |
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413 return |
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414 |
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415 try: |
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416 sha = nodemod.hex(self.sha.digest()) |
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417 self.packfp.close() |
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418 self.writeindex() |
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419 |
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420 if len(self.entries) == 0: |
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421 # Empty pack |
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422 self._cleantemppacks() |
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423 self._closed = True |
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424 return None |
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425 |
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426 self.opener.rename(self.packpath, sha + self.PACKSUFFIX) |
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427 try: |
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428 self.opener.rename(self.idxpath, sha + self.INDEXSUFFIX) |
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429 except Exception as ex: |
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430 try: |
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431 self.opener.unlink(sha + self.PACKSUFFIX) |
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432 except Exception: |
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433 pass |
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434 # Throw exception 'ex' explicitly since a normal 'raise' would |
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435 # potentially throw an exception from the unlink cleanup. |
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436 raise ex |
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437 except Exception: |
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438 # Clean up temp packs in all exception cases |
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439 self._cleantemppacks() |
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440 raise |
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441 |
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442 self._closed = True |
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443 result = self.opener.join(sha) |
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444 if ledger: |
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445 ledger.addcreated(result) |
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446 return result |
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447 |
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448 def _cleantemppacks(self): |
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449 try: |
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450 self.opener.unlink(self.packpath) |
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451 except Exception: |
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452 pass |
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453 try: |
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454 self.opener.unlink(self.idxpath) |
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455 except Exception: |
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456 pass |
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457 |
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458 def writeindex(self): |
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459 rawindex = '' |
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460 |
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461 largefanout = len(self.entries) > SMALLFANOUTCUTOFF |
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462 if largefanout: |
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463 params = indexparams(LARGEFANOUTPREFIX, self.VERSION) |
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464 else: |
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465 params = indexparams(SMALLFANOUTPREFIX, self.VERSION) |
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466 |
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467 fanouttable = [EMPTYFANOUT] * params.fanoutcount |
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468 |
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469 # Precompute the location of each entry |
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470 locations = {} |
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471 count = 0 |
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472 for node in sorted(self.entries): |
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473 location = count * self.INDEXENTRYLENGTH |
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474 locations[node] = location |
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475 count += 1 |
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476 |
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477 # Must use [0] on the unpack result since it's always a tuple. |
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478 fanoutkey = struct.unpack(params.fanoutstruct, |
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479 node[:params.fanoutprefix])[0] |
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480 if fanouttable[fanoutkey] == EMPTYFANOUT: |
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481 fanouttable[fanoutkey] = location |
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482 |
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483 rawfanouttable = '' |
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484 last = 0 |
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485 for offset in fanouttable: |
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486 offset = offset if offset != EMPTYFANOUT else last |
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487 last = offset |
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488 rawfanouttable += struct.pack('!I', offset) |
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489 |
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490 rawentrieslength = struct.pack('!Q', len(self.entries)) |
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491 |
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492 # The index offset is the it's location in the file. So after the 2 byte |
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493 # header and the fanouttable. |
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494 rawindex = self.createindex(locations, 2 + len(rawfanouttable)) |
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495 |
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496 self._writeheader(params) |
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497 self.idxfp.write(rawfanouttable) |
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498 self.idxfp.write(rawentrieslength) |
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499 self.idxfp.write(rawindex) |
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500 self.idxfp.close() |
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501 |
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502 def createindex(self, nodelocations): |
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503 raise NotImplementedError() |
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504 |
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505 def _writeheader(self, indexparams): |
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506 # Index header |
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507 # <version: 1 byte> |
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508 # <large fanout: 1 bit> # 1 means 2^16, 0 means 2^8 |
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509 # <unused: 7 bit> # future use (compression, delta format, etc) |
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510 config = 0 |
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511 if indexparams.fanoutprefix == LARGEFANOUTPREFIX: |
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512 config = 0b10000000 |
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513 self.idxfp.write(struct.pack('!BB', self.VERSION, config)) |
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514 |
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515 class indexparams(object): |
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516 __slots__ = (r'fanoutprefix', r'fanoutstruct', r'fanoutcount', |
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517 r'fanoutsize', r'indexstart') |
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518 |
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519 def __init__(self, prefixsize, version): |
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520 self.fanoutprefix = prefixsize |
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521 |
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522 # The struct pack format for fanout table location (i.e. the format that |
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523 # converts the node prefix into an integer location in the fanout |
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524 # table). |
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525 if prefixsize == SMALLFANOUTPREFIX: |
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526 self.fanoutstruct = '!B' |
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527 elif prefixsize == LARGEFANOUTPREFIX: |
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528 self.fanoutstruct = '!H' |
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529 else: |
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530 raise ValueError("invalid fanout prefix size: %s" % prefixsize) |
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531 |
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532 # The number of fanout table entries |
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533 self.fanoutcount = 2**(prefixsize * 8) |
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534 |
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535 # The total bytes used by the fanout table |
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536 self.fanoutsize = self.fanoutcount * 4 |
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537 |
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538 self.indexstart = FANOUTSTART + self.fanoutsize |
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539 # Skip the index length |
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540 self.indexstart += 8 |