Mercurial > hg
annotate hgext/remotefilelog/basepack.py @ 40526:1419f780207c
remotefilelog: fix various minor py3 problems
# skip-blame b prefixes and pycompat.long, nothing remotely interesting
Differential Revision: https://phab.mercurial-scm.org/D5223
author | Augie Fackler <augie@google.com> |
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date | Mon, 05 Nov 2018 17:48:23 -0500 |
parents | 10c10da14c5d |
children | 5e3b3f88c2e4 |
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 policy, |
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14 pycompat, |
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15 util, |
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16 vfs as vfsmod, |
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17 ) |
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18 from . import shallowutil |
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19 |
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20 osutil = policy.importmod(r'osutil') |
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21 |
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22 # The pack version supported by this implementation. This will need to be |
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23 # rev'd whenever the byte format changes. Ex: changing the fanout prefix, |
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24 # changing any of the int sizes, changing the delta algorithm, etc. |
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25 PACKVERSIONSIZE = 1 |
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26 INDEXVERSIONSIZE = 2 |
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27 |
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28 FANOUTSTART = INDEXVERSIONSIZE |
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29 |
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30 # Constant that indicates a fanout table entry hasn't been filled in. (This does |
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31 # not get serialized) |
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32 EMPTYFANOUT = -1 |
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33 |
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34 # The fanout prefix is the number of bytes that can be addressed by the fanout |
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35 # table. Example: a fanout prefix of 1 means we use the first byte of a hash to |
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36 # look in the fanout table (which will be 2^8 entries long). |
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37 SMALLFANOUTPREFIX = 1 |
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38 LARGEFANOUTPREFIX = 2 |
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39 |
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40 # The number of entries in the index at which point we switch to a large fanout. |
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41 # It is chosen to balance the linear scan through a sparse fanout, with the |
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42 # size of the bisect in actual index. |
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43 # 2^16 / 8 was chosen because it trades off (1 step fanout scan + 5 step |
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44 # bisect) with (8 step fanout scan + 1 step bisect) |
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45 # 5 step bisect = log(2^16 / 8 / 255) # fanout |
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46 # 10 step fanout scan = 2^16 / (2^16 / 8) # fanout space divided by entries |
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47 SMALLFANOUTCUTOFF = 2**16 / 8 |
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48 |
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49 # The amount of time to wait between checking for new packs. This prevents an |
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50 # exception when data is moved to a new pack after the process has already |
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51 # loaded the pack list. |
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52 REFRESHRATE = 0.1 |
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53 |
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54 if pycompat.isposix: |
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55 # With glibc 2.7+ the 'e' flag uses O_CLOEXEC when opening. |
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56 # The 'e' flag will be ignored on older versions of glibc. |
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57 PACKOPENMODE = 'rbe' |
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58 else: |
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59 PACKOPENMODE = 'rb' |
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60 |
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61 class _cachebackedpacks(object): |
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62 def __init__(self, packs, cachesize): |
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63 self._packs = set(packs) |
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64 self._lrucache = util.lrucachedict(cachesize) |
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65 self._lastpack = None |
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66 |
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67 # Avoid cold start of the cache by populating the most recent packs |
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68 # in the cache. |
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69 for i in reversed(range(min(cachesize, len(packs)))): |
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70 self._movetofront(packs[i]) |
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71 |
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72 def _movetofront(self, pack): |
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73 # This effectively makes pack the first entry in the cache. |
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74 self._lrucache[pack] = True |
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75 |
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76 def _registerlastpackusage(self): |
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77 if self._lastpack is not None: |
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78 self._movetofront(self._lastpack) |
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79 self._lastpack = None |
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80 |
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81 def add(self, pack): |
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82 self._registerlastpackusage() |
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83 |
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84 # This method will mostly be called when packs are not in cache. |
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85 # Therefore, adding pack to the cache. |
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86 self._movetofront(pack) |
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87 self._packs.add(pack) |
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88 |
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89 def __iter__(self): |
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90 self._registerlastpackusage() |
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91 |
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92 # Cache iteration is based on LRU. |
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93 for pack in self._lrucache: |
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94 self._lastpack = pack |
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95 yield pack |
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96 |
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97 cachedpacks = set(pack for pack in self._lrucache) |
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98 # Yield for paths not in the cache. |
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99 for pack in self._packs - cachedpacks: |
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100 self._lastpack = pack |
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101 yield pack |
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102 |
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103 # Data not found in any pack. |
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104 self._lastpack = None |
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105 |
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106 class basepackstore(object): |
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107 # Default cache size limit for the pack files. |
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108 DEFAULTCACHESIZE = 100 |
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109 |
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110 def __init__(self, ui, path): |
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111 self.ui = ui |
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112 self.path = path |
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113 |
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114 # lastrefesh is 0 so we'll immediately check for new packs on the first |
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115 # failure. |
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116 self.lastrefresh = 0 |
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117 |
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118 packs = [] |
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119 for filepath, __, __ in self._getavailablepackfilessorted(): |
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120 try: |
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121 pack = self.getpack(filepath) |
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122 except Exception as ex: |
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123 # An exception may be thrown if the pack file is corrupted |
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124 # somehow. Log a warning but keep going in this case, just |
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125 # skipping this pack file. |
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126 # |
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127 # If this is an ENOENT error then don't even bother logging. |
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128 # Someone could have removed the file since we retrieved the |
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129 # list of paths. |
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130 if getattr(ex, 'errno', None) != errno.ENOENT: |
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131 ui.warn(_('unable to load pack %s: %s\n') % (filepath, ex)) |
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132 continue |
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133 packs.append(pack) |
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134 |
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135 self.packs = _cachebackedpacks(packs, self.DEFAULTCACHESIZE) |
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136 |
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137 def _getavailablepackfiles(self): |
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138 """For each pack file (a index/data file combo), yields: |
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139 (full path without extension, mtime, size) |
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140 |
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141 mtime will be the mtime of the index/data file (whichever is newer) |
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142 size is the combined size of index/data file |
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143 """ |
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144 indexsuffixlen = len(self.INDEXSUFFIX) |
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145 packsuffixlen = len(self.PACKSUFFIX) |
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146 |
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147 ids = set() |
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148 sizes = collections.defaultdict(lambda: 0) |
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149 mtimes = collections.defaultdict(lambda: []) |
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150 try: |
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151 for filename, type, stat in osutil.listdir(self.path, stat=True): |
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152 id = None |
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153 if filename[-indexsuffixlen:] == self.INDEXSUFFIX: |
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154 id = filename[:-indexsuffixlen] |
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155 elif filename[-packsuffixlen:] == self.PACKSUFFIX: |
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156 id = filename[:-packsuffixlen] |
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157 |
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158 # Since we expect to have two files corresponding to each ID |
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159 # (the index file and the pack file), we can yield once we see |
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160 # it twice. |
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161 if id: |
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162 sizes[id] += stat.st_size # Sum both files' sizes together |
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163 mtimes[id].append(stat.st_mtime) |
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164 if id in ids: |
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165 yield (os.path.join(self.path, id), max(mtimes[id]), |
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166 sizes[id]) |
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167 else: |
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168 ids.add(id) |
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169 except OSError as ex: |
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170 if ex.errno != errno.ENOENT: |
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171 raise |
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172 |
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173 def _getavailablepackfilessorted(self): |
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174 """Like `_getavailablepackfiles`, but also sorts the files by mtime, |
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175 yielding newest files first. |
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176 |
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177 This is desirable, since it is more likely newer packfiles have more |
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178 desirable data. |
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179 """ |
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180 files = [] |
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181 for path, mtime, size in self._getavailablepackfiles(): |
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182 files.append((mtime, size, path)) |
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183 files = sorted(files, reverse=True) |
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184 for mtime, size, path in files: |
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185 yield path, mtime, size |
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186 |
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187 def gettotalsizeandcount(self): |
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188 """Returns the total disk size (in bytes) of all the pack files in |
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189 this store, and the count of pack files. |
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190 |
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191 (This might be smaller than the total size of the ``self.path`` |
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192 directory, since this only considers fuly-writen pack files, and not |
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193 temporary files or other detritus on the directory.) |
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194 """ |
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195 totalsize = 0 |
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196 count = 0 |
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197 for __, __, size in self._getavailablepackfiles(): |
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198 totalsize += size |
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199 count += 1 |
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200 return totalsize, count |
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201 |
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202 def getmetrics(self): |
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203 """Returns metrics on the state of this store.""" |
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204 size, count = self.gettotalsizeandcount() |
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205 return { |
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206 'numpacks': count, |
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207 'totalpacksize': size, |
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208 } |
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209 |
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210 def getpack(self, path): |
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211 raise NotImplementedError() |
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212 |
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213 def getmissing(self, keys): |
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214 missing = keys |
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215 for pack in self.packs: |
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216 missing = pack.getmissing(missing) |
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217 |
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218 # Ensures better performance of the cache by keeping the most |
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219 # recently accessed pack at the beginning in subsequent iterations. |
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220 if not missing: |
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221 return missing |
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222 |
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223 if missing: |
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224 for pack in self.refresh(): |
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225 missing = pack.getmissing(missing) |
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226 |
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227 return missing |
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228 |
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229 def markledger(self, ledger, options=None): |
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230 for pack in self.packs: |
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231 pack.markledger(ledger) |
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232 |
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233 def markforrefresh(self): |
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234 """Tells the store that there may be new pack files, so the next time it |
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235 has a lookup miss it should check for new files.""" |
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236 self.lastrefresh = 0 |
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237 |
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238 def refresh(self): |
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239 """Checks for any new packs on disk, adds them to the main pack list, |
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240 and returns a list of just the new packs.""" |
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241 now = time.time() |
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242 |
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243 # If we experience a lot of misses (like in the case of getmissing() on |
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244 # new objects), let's only actually check disk for new stuff every once |
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245 # in a while. Generally this code path should only ever matter when a |
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246 # repack is going on in the background, and that should be pretty rare |
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247 # to have that happen twice in quick succession. |
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248 newpacks = [] |
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249 if now > self.lastrefresh + REFRESHRATE: |
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250 self.lastrefresh = now |
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251 previous = set(p.path for p in self.packs) |
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252 for filepath, __, __ in self._getavailablepackfilessorted(): |
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253 if filepath not in previous: |
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254 newpack = self.getpack(filepath) |
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255 newpacks.append(newpack) |
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256 self.packs.add(newpack) |
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257 |
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258 return newpacks |
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259 |
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260 class versionmixin(object): |
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261 # Mix-in for classes with multiple supported versions |
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262 VERSION = None |
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263 SUPPORTED_VERSIONS = [2] |
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264 |
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265 def _checkversion(self, version): |
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266 if version in self.SUPPORTED_VERSIONS: |
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267 if self.VERSION is None: |
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268 # only affect this instance |
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269 self.VERSION = version |
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270 elif self.VERSION != version: |
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271 raise RuntimeError('inconsistent version: %s' % version) |
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272 else: |
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273 raise RuntimeError('unsupported version: %s' % version) |
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274 |
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275 class basepack(versionmixin): |
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276 # The maximum amount we should read via mmap before remmaping so the old |
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277 # pages can be released (100MB) |
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278 MAXPAGEDIN = 100 * 1024**2 |
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279 |
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280 SUPPORTED_VERSIONS = [2] |
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281 |
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282 def __init__(self, path): |
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283 self.path = path |
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284 self.packpath = path + self.PACKSUFFIX |
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285 self.indexpath = path + self.INDEXSUFFIX |
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286 |
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287 self.indexsize = os.stat(self.indexpath).st_size |
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288 self.datasize = os.stat(self.packpath).st_size |
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289 |
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290 self._index = None |
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291 self._data = None |
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292 self.freememory() # initialize the mmap |
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293 |
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294 version = struct.unpack('!B', self._data[:PACKVERSIONSIZE])[0] |
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295 self._checkversion(version) |
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296 |
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297 version, config = struct.unpack('!BB', self._index[:INDEXVERSIONSIZE]) |
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298 self._checkversion(version) |
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299 |
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300 if 0b10000000 & config: |
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301 self.params = indexparams(LARGEFANOUTPREFIX, version) |
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302 else: |
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303 self.params = indexparams(SMALLFANOUTPREFIX, version) |
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304 |
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305 @util.propertycache |
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306 def _fanouttable(self): |
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307 params = self.params |
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308 rawfanout = self._index[FANOUTSTART:FANOUTSTART + params.fanoutsize] |
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309 fanouttable = [] |
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310 for i in pycompat.xrange(0, params.fanoutcount): |
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311 loc = i * 4 |
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312 fanoutentry = struct.unpack('!I', rawfanout[loc:loc + 4])[0] |
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313 fanouttable.append(fanoutentry) |
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314 return fanouttable |
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315 |
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316 @util.propertycache |
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317 def _indexend(self): |
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318 nodecount = struct.unpack_from('!Q', self._index, |
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319 self.params.indexstart - 8)[0] |
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320 return self.params.indexstart + nodecount * self.INDEXENTRYLENGTH |
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321 |
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322 def freememory(self): |
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323 """Unmap and remap the memory to free it up after known expensive |
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324 operations. Return True if self._data and self._index were reloaded. |
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325 """ |
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326 if self._index: |
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327 if self._pagedin < self.MAXPAGEDIN: |
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328 return False |
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329 |
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330 self._index.close() |
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331 self._data.close() |
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332 |
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333 # TODO: use an opener/vfs to access these paths |
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334 with open(self.indexpath, PACKOPENMODE) as indexfp: |
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335 # memory-map the file, size 0 means whole file |
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336 self._index = mmap.mmap(indexfp.fileno(), 0, |
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337 access=mmap.ACCESS_READ) |
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338 with open(self.packpath, PACKOPENMODE) as datafp: |
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339 self._data = mmap.mmap(datafp.fileno(), 0, access=mmap.ACCESS_READ) |
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340 |
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341 self._pagedin = 0 |
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342 return True |
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343 |
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344 def getmissing(self, keys): |
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345 raise NotImplementedError() |
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346 |
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347 def markledger(self, ledger, options=None): |
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348 raise NotImplementedError() |
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349 |
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350 def cleanup(self, ledger): |
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351 raise NotImplementedError() |
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352 |
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353 def __iter__(self): |
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354 raise NotImplementedError() |
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355 |
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356 def iterentries(self): |
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357 raise NotImplementedError() |
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358 |
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359 class mutablebasepack(versionmixin): |
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360 |
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361 def __init__(self, ui, packdir, version=2): |
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362 self._checkversion(version) |
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363 # TODO(augie): make this configurable |
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364 self._compressor = 'GZ' |
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365 opener = vfsmod.vfs(packdir) |
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366 opener.createmode = 0o444 |
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367 self.opener = opener |
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368 |
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369 self.entries = {} |
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370 |
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371 shallowutil.mkstickygroupdir(ui, packdir) |
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372 self.packfp, self.packpath = opener.mkstemp( |
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373 suffix=self.PACKSUFFIX + '-tmp') |
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374 self.idxfp, self.idxpath = opener.mkstemp( |
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375 suffix=self.INDEXSUFFIX + '-tmp') |
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376 self.packfp = os.fdopen(self.packfp, 'w+') |
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377 self.idxfp = os.fdopen(self.idxfp, 'w+') |
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378 self.sha = hashlib.sha1() |
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379 self._closed = False |
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380 |
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381 # The opener provides no way of doing permission fixup on files created |
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382 # via mkstemp, so we must fix it ourselves. We can probably fix this |
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383 # upstream in vfs.mkstemp so we don't need to use the private method. |
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384 opener._fixfilemode(opener.join(self.packpath)) |
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385 opener._fixfilemode(opener.join(self.idxpath)) |
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386 |
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387 # Write header |
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388 # TODO: make it extensible (ex: allow specifying compression algorithm, |
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389 # a flexible key/value header, delta algorithm, fanout size, etc) |
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390 versionbuf = struct.pack('!B', self.VERSION) # unsigned 1 byte int |
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391 self.writeraw(versionbuf) |
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392 |
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393 def __enter__(self): |
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394 return self |
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395 |
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396 def __exit__(self, exc_type, exc_value, traceback): |
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397 if exc_type is None: |
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398 self.close() |
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399 else: |
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400 self.abort() |
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401 |
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402 def abort(self): |
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403 # Unclean exit |
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404 self._cleantemppacks() |
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405 |
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406 def writeraw(self, data): |
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407 self.packfp.write(data) |
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408 self.sha.update(data) |
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409 |
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410 def close(self, ledger=None): |
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411 if self._closed: |
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412 return |
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413 |
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414 try: |
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415 sha = self.sha.hexdigest() |
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416 self.packfp.close() |
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417 self.writeindex() |
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418 |
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419 if len(self.entries) == 0: |
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420 # Empty pack |
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421 self._cleantemppacks() |
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422 self._closed = True |
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423 return None |
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424 |
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425 self.opener.rename(self.packpath, sha + self.PACKSUFFIX) |
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426 try: |
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427 self.opener.rename(self.idxpath, sha + self.INDEXSUFFIX) |
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428 except Exception as ex: |
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429 try: |
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430 self.opener.unlink(sha + self.PACKSUFFIX) |
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431 except Exception: |
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432 pass |
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433 # Throw exception 'ex' explicitly since a normal 'raise' would |
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434 # potentially throw an exception from the unlink cleanup. |
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435 raise ex |
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436 except Exception: |
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437 # Clean up temp packs in all exception cases |
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438 self._cleantemppacks() |
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439 raise |
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440 |
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441 self._closed = True |
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442 result = self.opener.join(sha) |
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443 if ledger: |
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444 ledger.addcreated(result) |
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445 return result |
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446 |
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447 def _cleantemppacks(self): |
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448 try: |
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449 self.opener.unlink(self.packpath) |
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450 except Exception: |
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451 pass |
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452 try: |
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453 self.opener.unlink(self.idxpath) |
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454 except Exception: |
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455 pass |
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456 |
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457 def writeindex(self): |
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458 rawindex = '' |
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459 |
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460 largefanout = len(self.entries) > SMALLFANOUTCUTOFF |
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461 if largefanout: |
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462 params = indexparams(LARGEFANOUTPREFIX, self.VERSION) |
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463 else: |
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464 params = indexparams(SMALLFANOUTPREFIX, self.VERSION) |
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465 |
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466 fanouttable = [EMPTYFANOUT] * params.fanoutcount |
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467 |
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468 # Precompute the location of each entry |
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469 locations = {} |
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470 count = 0 |
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471 for node in sorted(self.entries.iterkeys()): |
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472 location = count * self.INDEXENTRYLENGTH |
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473 locations[node] = location |
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474 count += 1 |
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475 |
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476 # Must use [0] on the unpack result since it's always a tuple. |
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477 fanoutkey = struct.unpack(params.fanoutstruct, |
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478 node[:params.fanoutprefix])[0] |
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479 if fanouttable[fanoutkey] == EMPTYFANOUT: |
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480 fanouttable[fanoutkey] = location |
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481 |
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482 rawfanouttable = '' |
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483 last = 0 |
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484 for offset in fanouttable: |
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485 offset = offset if offset != EMPTYFANOUT else last |
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486 last = offset |
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487 rawfanouttable += struct.pack('!I', offset) |
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488 |
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489 rawentrieslength = struct.pack('!Q', len(self.entries)) |
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490 |
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491 # The index offset is the it's location in the file. So after the 2 byte |
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492 # header and the fanouttable. |
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493 rawindex = self.createindex(locations, 2 + len(rawfanouttable)) |
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494 |
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495 self._writeheader(params) |
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496 self.idxfp.write(rawfanouttable) |
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497 self.idxfp.write(rawentrieslength) |
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498 self.idxfp.write(rawindex) |
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499 self.idxfp.close() |
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500 |
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501 def createindex(self, nodelocations): |
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502 raise NotImplementedError() |
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503 |
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504 def _writeheader(self, indexparams): |
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505 # Index header |
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506 # <version: 1 byte> |
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507 # <large fanout: 1 bit> # 1 means 2^16, 0 means 2^8 |
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508 # <unused: 7 bit> # future use (compression, delta format, etc) |
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509 config = 0 |
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510 if indexparams.fanoutprefix == LARGEFANOUTPREFIX: |
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511 config = 0b10000000 |
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512 self.idxfp.write(struct.pack('!BB', self.VERSION, config)) |
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513 |
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514 class indexparams(object): |
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515 __slots__ = (r'fanoutprefix', r'fanoutstruct', r'fanoutcount', |
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516 r'fanoutsize', r'indexstart') |
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517 |
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518 def __init__(self, prefixsize, version): |
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519 self.fanoutprefix = prefixsize |
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520 |
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521 # The struct pack format for fanout table location (i.e. the format that |
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522 # converts the node prefix into an integer location in the fanout |
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523 # table). |
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524 if prefixsize == SMALLFANOUTPREFIX: |
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525 self.fanoutstruct = '!B' |
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526 elif prefixsize == LARGEFANOUTPREFIX: |
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527 self.fanoutstruct = '!H' |
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528 else: |
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529 raise ValueError("invalid fanout prefix size: %s" % prefixsize) |
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530 |
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531 # The number of fanout table entries |
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532 self.fanoutcount = 2**(prefixsize * 8) |
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533 |
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534 # The total bytes used by the fanout table |
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535 self.fanoutsize = self.fanoutcount * 4 |
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536 |
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537 self.indexstart = FANOUTSTART + self.fanoutsize |
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538 # Skip the index length |
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539 self.indexstart += 8 |