author | Pierre-Yves David <pierre-yves.david@octobus.net> |
Wed, 27 Jul 2022 12:07:18 +0200 | |
branch | stable |
changeset 49406 | f69bffd00abe |
parent 49306 | 2e726c934fcd |
child 50929 | 18c8c18993f0 |
permissions | -rw-r--r-- |
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import collections |
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import errno |
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import mmap |
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import os |
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import struct |
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import time |
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from mercurial.i18n import _ |
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from mercurial.pycompat import ( |
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getattr, |
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open, |
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) |
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from mercurial.node import hex |
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from mercurial import ( |
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policy, |
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util, |
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vfs as vfsmod, |
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) |
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from mercurial.utils import hashutil |
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from . import shallowutil |
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osutil = policy.importmod('osutil') |
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# The pack version supported by this implementation. This will need to be |
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# rev'd whenever the byte format changes. Ex: changing the fanout prefix, |
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# changing any of the int sizes, changing the delta algorithm, etc. |
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PACKVERSIONSIZE = 1 |
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INDEXVERSIONSIZE = 2 |
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FANOUTSTART = INDEXVERSIONSIZE |
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# Constant that indicates a fanout table entry hasn't been filled in. (This does |
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# not get serialized) |
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EMPTYFANOUT = -1 |
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# The fanout prefix is the number of bytes that can be addressed by the fanout |
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# table. Example: a fanout prefix of 1 means we use the first byte of a hash to |
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# look in the fanout table (which will be 2^8 entries long). |
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SMALLFANOUTPREFIX = 1 |
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LARGEFANOUTPREFIX = 2 |
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# The number of entries in the index at which point we switch to a large fanout. |
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# It is chosen to balance the linear scan through a sparse fanout, with the |
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# size of the bisect in actual index. |
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# 2^16 / 8 was chosen because it trades off (1 step fanout scan + 5 step |
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# bisect) with (8 step fanout scan + 1 step bisect) |
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# 5 step bisect = log(2^16 / 8 / 255) # fanout |
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# 10 step fanout scan = 2^16 / (2^16 / 8) # fanout space divided by entries |
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SMALLFANOUTCUTOFF = 2 ** 16 // 8 |
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# The amount of time to wait between checking for new packs. This prevents an |
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# exception when data is moved to a new pack after the process has already |
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# loaded the pack list. |
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REFRESHRATE = 0.1 |
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class _cachebackedpacks: |
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def __init__(self, packs, cachesize): |
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self._packs = set(packs) |
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self._lrucache = util.lrucachedict(cachesize) |
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self._lastpack = None |
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# Avoid cold start of the cache by populating the most recent packs |
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# in the cache. |
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for i in reversed(range(min(cachesize, len(packs)))): |
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self._movetofront(packs[i]) |
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def _movetofront(self, pack): |
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# This effectively makes pack the first entry in the cache. |
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self._lrucache[pack] = True |
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def _registerlastpackusage(self): |
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if self._lastpack is not None: |
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self._movetofront(self._lastpack) |
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self._lastpack = None |
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def add(self, pack): |
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self._registerlastpackusage() |
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# This method will mostly be called when packs are not in cache. |
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# Therefore, adding pack to the cache. |
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self._movetofront(pack) |
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self._packs.add(pack) |
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def __iter__(self): |
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self._registerlastpackusage() |
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# Cache iteration is based on LRU. |
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for pack in self._lrucache: |
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self._lastpack = pack |
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yield pack |
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cachedpacks = {pack for pack in self._lrucache} |
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# Yield for paths not in the cache. |
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for pack in self._packs - cachedpacks: |
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self._lastpack = pack |
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yield pack |
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# Data not found in any pack. |
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self._lastpack = None |
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class basepackstore: |
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# Default cache size limit for the pack files. |
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105 |
DEFAULTCACHESIZE = 100 |
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106 |
|
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107 |
def __init__(self, ui, path): |
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108 |
self.ui = ui |
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109 |
self.path = path |
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110 |
|
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111 |
# lastrefesh is 0 so we'll immediately check for new packs on the first |
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112 |
# failure. |
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113 |
self.lastrefresh = 0 |
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114 |
|
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115 |
packs = [] |
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116 |
for filepath, __, __ in self._getavailablepackfilessorted(): |
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117 |
try: |
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118 |
pack = self.getpack(filepath) |
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119 |
except Exception as ex: |
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120 |
# An exception may be thrown if the pack file is corrupted |
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121 |
# somehow. Log a warning but keep going in this case, just |
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122 |
# skipping this pack file. |
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123 |
# |
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124 |
# If this is an ENOENT error then don't even bother logging. |
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125 |
# Someone could have removed the file since we retrieved the |
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126 |
# list of paths. |
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127 |
if getattr(ex, 'errno', None) != errno.ENOENT: |
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128 |
ui.warn(_(b'unable to load pack %s: %s\n') % (filepath, ex)) |
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129 |
continue |
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130 |
packs.append(pack) |
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131 |
|
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132 |
self.packs = _cachebackedpacks(packs, self.DEFAULTCACHESIZE) |
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133 |
|
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134 |
def _getavailablepackfiles(self): |
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135 |
"""For each pack file (a index/data file combo), yields: |
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136 |
(full path without extension, mtime, size) |
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137 |
|
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138 |
mtime will be the mtime of the index/data file (whichever is newer) |
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139 |
size is the combined size of index/data file |
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140 |
""" |
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141 |
indexsuffixlen = len(self.INDEXSUFFIX) |
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142 |
packsuffixlen = len(self.PACKSUFFIX) |
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143 |
|
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144 |
ids = set() |
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145 |
sizes = collections.defaultdict(lambda: 0) |
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146 |
mtimes = collections.defaultdict(lambda: []) |
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147 |
try: |
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148 |
for filename, type, stat in osutil.listdir(self.path, stat=True): |
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149 |
id = None |
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150 |
if filename[-indexsuffixlen:] == self.INDEXSUFFIX: |
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151 |
id = filename[:-indexsuffixlen] |
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152 |
elif filename[-packsuffixlen:] == self.PACKSUFFIX: |
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153 |
id = filename[:-packsuffixlen] |
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154 |
|
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155 |
# Since we expect to have two files corresponding to each ID |
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156 |
# (the index file and the pack file), we can yield once we see |
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157 |
# it twice. |
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158 |
if id: |
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159 |
sizes[id] += stat.st_size # Sum both files' sizes together |
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160 |
mtimes[id].append(stat.st_mtime) |
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161 |
if id in ids: |
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162 |
yield ( |
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163 |
os.path.join(self.path, id), |
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164 |
max(mtimes[id]), |
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165 |
sizes[id], |
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166 |
) |
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167 |
else: |
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168 |
ids.add(id) |
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169 |
except FileNotFoundError: |
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170 |
pass |
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171 |
|
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172 |
def _getavailablepackfilessorted(self): |
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173 |
"""Like `_getavailablepackfiles`, but also sorts the files by mtime, |
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174 |
yielding newest files first. |
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175 |
|
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176 |
This is desirable, since it is more likely newer packfiles have more |
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177 |
desirable data. |
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178 |
""" |
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179 |
files = [] |
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180 |
for path, mtime, size in self._getavailablepackfiles(): |
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181 |
files.append((mtime, size, path)) |
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182 |
files = sorted(files, reverse=True) |
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183 |
for mtime, size, path in files: |
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184 |
yield path, mtime, size |
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185 |
|
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186 |
def gettotalsizeandcount(self): |
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187 |
"""Returns the total disk size (in bytes) of all the pack files in |
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188 |
this store, and the count of pack files. |
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189 |
|
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190 |
(This might be smaller than the total size of the ``self.path`` |
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191 |
directory, since this only considers fuly-writen pack files, and not |
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192 |
temporary files or other detritus on the directory.) |
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193 |
""" |
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194 |
totalsize = 0 |
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195 |
count = 0 |
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196 |
for __, __, size in self._getavailablepackfiles(): |
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197 |
totalsize += size |
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198 |
count += 1 |
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199 |
return totalsize, count |
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200 |
|
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201 |
def getmetrics(self): |
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202 |
"""Returns metrics on the state of this store.""" |
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203 |
size, count = self.gettotalsizeandcount() |
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204 |
return { |
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205 |
b'numpacks': count, |
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206 |
b'totalpacksize': size, |
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207 |
} |
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208 |
|
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209 |
def getpack(self, path): |
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raise NotImplementedError() |
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def getmissing(self, keys): |
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missing = keys |
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for pack in self.packs: |
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missing = pack.getmissing(missing) |
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# Ensures better performance of the cache by keeping the most |
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# recently accessed pack at the beginning in subsequent iterations. |
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if not missing: |
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return missing |
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if missing: |
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for pack in self.refresh(): |
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missing = pack.getmissing(missing) |
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return missing |
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def markledger(self, ledger, options=None): |
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for pack in self.packs: |
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pack.markledger(ledger) |
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def markforrefresh(self): |
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"""Tells the store that there may be new pack files, so the next time it |
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has a lookup miss it should check for new files.""" |
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235 |
self.lastrefresh = 0 |
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236 |
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237 |
def refresh(self): |
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"""Checks for any new packs on disk, adds them to the main pack list, |
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and returns a list of just the new packs.""" |
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now = time.time() |
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# If we experience a lot of misses (like in the case of getmissing() on |
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243 |
# new objects), let's only actually check disk for new stuff every once |
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244 |
# in a while. Generally this code path should only ever matter when a |
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# repack is going on in the background, and that should be pretty rare |
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# to have that happen twice in quick succession. |
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247 |
newpacks = [] |
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248 |
if now > self.lastrefresh + REFRESHRATE: |
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self.lastrefresh = now |
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previous = {p.path for p in self.packs} |
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for filepath, __, __ in self._getavailablepackfilessorted(): |
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if filepath not in previous: |
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253 |
newpack = self.getpack(filepath) |
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newpacks.append(newpack) |
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255 |
self.packs.add(newpack) |
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256 |
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257 |
return newpacks |
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258 |
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class versionmixin: |
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261 |
# Mix-in for classes with multiple supported versions |
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VERSION = None |
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SUPPORTED_VERSIONS = [2] |
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265 |
def _checkversion(self, version): |
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if version in self.SUPPORTED_VERSIONS: |
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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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elif self.VERSION != version: |
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raise RuntimeError(b'inconsistent version: %d' % version) |
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else: |
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raise RuntimeError(b'unsupported version: %d' % version) |
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275 |
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276 |
class basepack(versionmixin): |
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# 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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MAXPAGEDIN = 100 * 1024 ** 2 |
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SUPPORTED_VERSIONS = [2] |
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283 |
def __init__(self, path): |
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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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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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291 |
self._index = None |
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self._data = None |
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self.freememory() # initialize the mmap |
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295 |
version = struct.unpack(b'!B', self._data[:PACKVERSIONSIZE])[0] |
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296 |
self._checkversion(version) |
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298 |
version, config = struct.unpack(b'!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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else: |
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304 |
self.params = indexparams(SMALLFANOUTPREFIX, version) |
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306 |
@util.propertycache |
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307 |
def _fanouttable(self): |
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params = self.params |
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rawfanout = self._index[FANOUTSTART : FANOUTSTART + params.fanoutsize] |
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fanouttable = [] |
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for i in range(0, params.fanoutcount): |
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loc = i * 4 |
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fanoutentry = struct.unpack(b'!I', rawfanout[loc : loc + 4])[0] |
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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( |
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320 |
b'!Q', self._index, self.params.indexstart - 8 |
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321 |
)[0] |
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322 |
return self.params.indexstart + nodecount * self.INDEXENTRYLENGTH |
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323 |
|
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324 |
def freememory(self): |
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325 |
"""Unmap and remap the memory to free it up after known expensive |
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326 |
operations. Return True if self._data and self._index were reloaded. |
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327 |
""" |
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328 |
if self._index: |
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329 |
if self._pagedin < self.MAXPAGEDIN: |
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330 |
return False |
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|
331 |
|
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332 |
self._index.close() |
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|
333 |
self._data.close() |
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|
334 |
|
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335 |
# TODO: use an opener/vfs to access these paths |
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336 |
with open(self.indexpath, b'rb') as indexfp: |
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337 |
# memory-map the file, size 0 means whole file |
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338 |
self._index = mmap.mmap( |
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339 |
indexfp.fileno(), 0, access=mmap.ACCESS_READ |
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340 |
) |
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341 |
with open(self.packpath, b'rb') as datafp: |
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342 |
self._data = mmap.mmap(datafp.fileno(), 0, access=mmap.ACCESS_READ) |
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|
343 |
|
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|
344 |
self._pagedin = 0 |
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345 |
return True |
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|
346 |
|
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|
347 |
def getmissing(self, keys): |
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348 |
raise NotImplementedError() |
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|
349 |
|
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350 |
def markledger(self, ledger, options=None): |
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351 |
raise NotImplementedError() |
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|
352 |
|
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|
353 |
def cleanup(self, ledger): |
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354 |
raise NotImplementedError() |
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|
355 |
|
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|
356 |
def __iter__(self): |
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357 |
raise NotImplementedError() |
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|
358 |
|
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|
359 |
def iterentries(self): |
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|
360 |
raise NotImplementedError() |
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|
361 |
|
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362 |
|
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363 |
class mutablebasepack(versionmixin): |
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364 |
def __init__(self, ui, packdir, version=2): |
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365 |
self._checkversion(version) |
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366 |
# TODO(augie): make this configurable |
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367 |
self._compressor = b'GZ' |
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368 |
opener = vfsmod.vfs(packdir) |
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369 |
opener.createmode = 0o444 |
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|
370 |
self.opener = opener |
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|
371 |
|
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372 |
self.entries = {} |
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|
373 |
|
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|
374 |
shallowutil.mkstickygroupdir(ui, packdir) |
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375 |
self.packfp, self.packpath = opener.mkstemp( |
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376 |
suffix=self.PACKSUFFIX + b'-tmp' |
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|
377 |
) |
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378 |
self.idxfp, self.idxpath = opener.mkstemp( |
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379 |
suffix=self.INDEXSUFFIX + b'-tmp' |
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|
380 |
) |
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|
381 |
self.packfp = os.fdopen(self.packfp, 'wb+') |
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382 |
self.idxfp = os.fdopen(self.idxfp, 'wb+') |
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|
383 |
self.sha = hashutil.sha1() |
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|
384 |
self._closed = False |
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|
385 |
|
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|
386 |
# The opener provides no way of doing permission fixup on files created |
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|
387 |
# via mkstemp, so we must fix it ourselves. We can probably fix this |
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|
388 |
# upstream in vfs.mkstemp so we don't need to use the private method. |
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|
389 |
opener._fixfilemode(opener.join(self.packpath)) |
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|
390 |
opener._fixfilemode(opener.join(self.idxpath)) |
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|
391 |
|
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|
392 |
# Write header |
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|
393 |
# TODO: make it extensible (ex: allow specifying compression algorithm, |
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|
394 |
# a flexible key/value header, delta algorithm, fanout size, etc) |
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|
395 |
versionbuf = struct.pack(b'!B', self.VERSION) # unsigned 1 byte int |
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|
396 |
self.writeraw(versionbuf) |
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|
397 |
|
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|
398 |
def __enter__(self): |
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|
399 |
return self |
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|
400 |
|
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|
401 |
def __exit__(self, exc_type, exc_value, traceback): |
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|
402 |
if exc_type is None: |
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|
403 |
self.close() |
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|
404 |
else: |
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|
405 |
self.abort() |
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|
406 |
|
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|
407 |
def abort(self): |
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|
408 |
# Unclean exit |
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|
409 |
self._cleantemppacks() |
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|
410 |
|
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|
411 |
def writeraw(self, data): |
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|
412 |
self.packfp.write(data) |
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|
413 |
self.sha.update(data) |
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|
414 |
|
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|
415 |
def close(self, ledger=None): |
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|
416 |
if self._closed: |
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|
417 |
return |
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|
418 |
|
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|
419 |
try: |
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|
420 |
sha = hex(self.sha.digest()) |
40495
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
421 |
self.packfp.close() |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
422 |
self.writeindex() |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
423 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
424 |
if len(self.entries) == 0: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
425 |
# Empty pack |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
426 |
self._cleantemppacks() |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
427 |
self._closed = True |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
428 |
return None |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
429 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
430 |
self.opener.rename(self.packpath, sha + self.PACKSUFFIX) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
431 |
try: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
432 |
self.opener.rename(self.idxpath, sha + self.INDEXSUFFIX) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
433 |
except Exception as ex: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
434 |
try: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
435 |
self.opener.unlink(sha + self.PACKSUFFIX) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
436 |
except Exception: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
437 |
pass |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
438 |
# Throw exception 'ex' explicitly since a normal 'raise' would |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
439 |
# potentially throw an exception from the unlink cleanup. |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
440 |
raise ex |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
441 |
except Exception: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
442 |
# Clean up temp packs in all exception cases |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
443 |
self._cleantemppacks() |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
444 |
raise |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
445 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
446 |
self._closed = True |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
447 |
result = self.opener.join(sha) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
448 |
if ledger: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
449 |
ledger.addcreated(result) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
450 |
return result |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
451 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
452 |
def _cleantemppacks(self): |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
453 |
try: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
454 |
self.opener.unlink(self.packpath) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
455 |
except Exception: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
456 |
pass |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
457 |
try: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
458 |
self.opener.unlink(self.idxpath) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
459 |
except Exception: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
460 |
pass |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
461 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
462 |
def writeindex(self): |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
463 |
largefanout = len(self.entries) > SMALLFANOUTCUTOFF |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
464 |
if largefanout: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
465 |
params = indexparams(LARGEFANOUTPREFIX, self.VERSION) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
466 |
else: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
467 |
params = indexparams(SMALLFANOUTPREFIX, self.VERSION) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
468 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
469 |
fanouttable = [EMPTYFANOUT] * params.fanoutcount |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
470 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
471 |
# Precompute the location of each entry |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
472 |
locations = {} |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
473 |
count = 0 |
40613
9769e0f6ffe0
py3: don't use dict.iterkeys()
Pulkit Goyal <pulkit@yandex-team.ru>
parents:
40611
diff
changeset
|
474 |
for node in sorted(self.entries): |
40495
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
475 |
location = count * self.INDEXENTRYLENGTH |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
476 |
locations[node] = location |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
477 |
count += 1 |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
478 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
479 |
# Must use [0] on the unpack result since it's always a tuple. |
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
41365
diff
changeset
|
480 |
fanoutkey = struct.unpack( |
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
41365
diff
changeset
|
481 |
params.fanoutstruct, node[: params.fanoutprefix] |
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
41365
diff
changeset
|
482 |
)[0] |
40495
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
483 |
if fanouttable[fanoutkey] == EMPTYFANOUT: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
484 |
fanouttable[fanoutkey] = location |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
485 |
|
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
486 |
rawfanouttable = b'' |
40495
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
487 |
last = 0 |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
488 |
for offset in fanouttable: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
489 |
offset = offset if offset != EMPTYFANOUT else last |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
490 |
last = offset |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
491 |
rawfanouttable += struct.pack(b'!I', offset) |
40495
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
492 |
|
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
493 |
rawentrieslength = struct.pack(b'!Q', len(self.entries)) |
40495
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
494 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
495 |
# The index offset is the it's location in the file. So after the 2 byte |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
496 |
# header and the fanouttable. |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
497 |
rawindex = self.createindex(locations, 2 + len(rawfanouttable)) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
498 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
499 |
self._writeheader(params) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
500 |
self.idxfp.write(rawfanouttable) |
40506
10c10da14c5d
remotefilelog: bump pack file formats to version 2
Augie Fackler <augie@google.com>
parents:
40495
diff
changeset
|
501 |
self.idxfp.write(rawentrieslength) |
40495
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
502 |
self.idxfp.write(rawindex) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
503 |
self.idxfp.close() |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
504 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
505 |
def createindex(self, nodelocations): |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
506 |
raise NotImplementedError() |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
507 |
|
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
508 |
def _writeheader(self, indexparams): |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
509 |
# Index header |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
510 |
# <version: 1 byte> |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
511 |
# <large fanout: 1 bit> # 1 means 2^16, 0 means 2^8 |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
512 |
# <unused: 7 bit> # future use (compression, delta format, etc) |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
513 |
config = 0 |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
514 |
if indexparams.fanoutprefix == LARGEFANOUTPREFIX: |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
515 |
config = 0b10000000 |
43077
687b865b95ad
formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents:
43076
diff
changeset
|
516 |
self.idxfp.write(struct.pack(b'!BB', self.VERSION, config)) |
40495
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff
changeset
|
517 |
|
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
41365
diff
changeset
|
518 |
|
48946
642e31cb55f0
py3: use class X: instead of class X(object):
Gregory Szorc <gregory.szorc@gmail.com>
parents:
48875
diff
changeset
|
519 |
class indexparams: |
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
41365
diff
changeset
|
520 |
__slots__ = ( |
43506
9f70512ae2cf
cleanup: remove pointless r-prefixes on single-quoted strings
Augie Fackler <augie@google.com>
parents:
43089
diff
changeset
|
521 |
'fanoutprefix', |
9f70512ae2cf
cleanup: remove pointless r-prefixes on single-quoted strings
Augie Fackler <augie@google.com>
parents:
43089
diff
changeset
|
522 |
'fanoutstruct', |
9f70512ae2cf
cleanup: remove pointless r-prefixes on single-quoted strings
Augie Fackler <augie@google.com>
parents:
43089
diff
changeset
|
523 |
'fanoutcount', |
9f70512ae2cf
cleanup: remove pointless r-prefixes on single-quoted strings
Augie Fackler <augie@google.com>
parents:
43089
diff
changeset
|
524 |
'fanoutsize', |
9f70512ae2cf
cleanup: remove pointless r-prefixes on single-quoted strings
Augie Fackler <augie@google.com>
parents:
43089
diff
changeset
|
525 |
'indexstart', |
43076
2372284d9457
formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents:
41365
diff
changeset
|
526 |
) |
40495
3a333a582d7b
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|
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def __init__(self, prefixsize, version): |
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self.fanoutprefix = prefixsize |
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parents:
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|
530 |
|
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parents:
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|
531 |
# The struct pack format for fanout table location (i.e. the format that |
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532 |
# converts the node prefix into an integer location in the fanout |
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parents:
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533 |
# table). |
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534 |
if prefixsize == SMALLFANOUTPREFIX: |
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535 |
self.fanoutstruct = b'!B' |
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536 |
elif prefixsize == LARGEFANOUTPREFIX: |
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537 |
self.fanoutstruct = b'!H' |
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parents:
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538 |
else: |
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539 |
raise ValueError(b"invalid fanout prefix size: %s" % prefixsize) |
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parents:
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|
540 |
|
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|
541 |
# The number of fanout table entries |
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542 |
self.fanoutcount = 2 ** (prefixsize * 8) |
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parents:
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|
543 |
|
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parents:
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|
544 |
# The total bytes used by the fanout table |
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parents:
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545 |
self.fanoutsize = self.fanoutcount * 4 |
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|
546 |
|
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parents:
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|
547 |
self.indexstart = FANOUTSTART + self.fanoutsize |
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# Skip the index length |
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549 |
self.indexstart += 8 |