mirror of
https://github.com/facebook/sapling.git
synced 2024-10-11 01:07:15 +03:00
1672ae6377
In my tests of an fncache containing 300,000 entries, this improves read time from 567ms to 307, and write time from 1328ms to 533. These numbers aren't so great, since the fncache file is only 17MB in size, but they're an improvement.
428 lines
14 KiB
Python
428 lines
14 KiB
Python
# store.py - repository store handling for Mercurial
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#
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# Copyright 2008 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from i18n import _
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import osutil, scmutil, util
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import os, stat
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_sha = util.sha1
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# This avoids a collision between a file named foo and a dir named
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# foo.i or foo.d
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def encodedir(path):
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'''
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>>> encodedir('data/foo.i')
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'data/foo.i'
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>>> encodedir('data/foo.i/bla.i')
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'data/foo.i.hg/bla.i'
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>>> encodedir('data/foo.i.hg/bla.i')
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'data/foo.i.hg.hg/bla.i'
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'''
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if not path.startswith('data/'):
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return path
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return (path
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.replace(".hg/", ".hg.hg/")
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.replace(".i/", ".i.hg/")
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.replace(".d/", ".d.hg/"))
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def decodedir(path):
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'''
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>>> decodedir('data/foo.i')
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'data/foo.i'
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>>> decodedir('data/foo.i.hg/bla.i')
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'data/foo.i/bla.i'
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>>> decodedir('data/foo.i.hg.hg/bla.i')
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'data/foo.i.hg/bla.i'
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'''
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if not path.startswith('data/') or ".hg/" not in path:
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return path
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return (path
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.replace(".d.hg/", ".d/")
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.replace(".i.hg/", ".i/")
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.replace(".hg.hg/", ".hg/"))
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def _buildencodefun():
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'''
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>>> enc, dec = _buildencodefun()
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>>> enc('nothing/special.txt')
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'nothing/special.txt'
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>>> dec('nothing/special.txt')
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'nothing/special.txt'
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>>> enc('HELLO')
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'_h_e_l_l_o'
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>>> dec('_h_e_l_l_o')
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'HELLO'
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>>> enc('hello:world?')
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'hello~3aworld~3f'
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>>> dec('hello~3aworld~3f')
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'hello:world?'
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>>> enc('the\x07quick\xADshot')
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'the~07quick~adshot'
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>>> dec('the~07quick~adshot')
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'the\\x07quick\\xadshot'
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'''
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e = '_'
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winreserved = [ord(x) for x in '\\:*?"<>|']
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cmap = dict([(chr(x), chr(x)) for x in xrange(127)])
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for x in (range(32) + range(126, 256) + winreserved):
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cmap[chr(x)] = "~%02x" % x
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for x in range(ord("A"), ord("Z")+1) + [ord(e)]:
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cmap[chr(x)] = e + chr(x).lower()
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dmap = {}
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for k, v in cmap.iteritems():
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dmap[v] = k
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def decode(s):
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i = 0
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while i < len(s):
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for l in xrange(1, 4):
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try:
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yield dmap[s[i:i + l]]
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i += l
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break
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except KeyError:
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pass
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else:
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raise KeyError
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return (lambda s: "".join([cmap[c] for c in encodedir(s)]),
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lambda s: decodedir("".join(list(decode(s)))))
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encodefilename, decodefilename = _buildencodefun()
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def _buildlowerencodefun():
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'''
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>>> f = _buildlowerencodefun()
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>>> f('nothing/special.txt')
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'nothing/special.txt'
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>>> f('HELLO')
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'hello'
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>>> f('hello:world?')
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'hello~3aworld~3f'
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>>> f('the\x07quick\xADshot')
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'the~07quick~adshot'
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'''
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winreserved = [ord(x) for x in '\\:*?"<>|']
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cmap = dict([(chr(x), chr(x)) for x in xrange(127)])
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for x in (range(32) + range(126, 256) + winreserved):
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cmap[chr(x)] = "~%02x" % x
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for x in range(ord("A"), ord("Z")+1):
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cmap[chr(x)] = chr(x).lower()
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return lambda s: "".join([cmap[c] for c in s])
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lowerencode = _buildlowerencodefun()
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_winreservednames = '''con prn aux nul
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com1 com2 com3 com4 com5 com6 com7 com8 com9
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lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9'''.split()
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def _auxencode(path, dotencode):
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'''
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Encodes filenames containing names reserved by Windows or which end in
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period or space. Does not touch other single reserved characters c.
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Specifically, c in '\\:*?"<>|' or ord(c) <= 31 are *not* encoded here.
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Additionally encodes space or period at the beginning, if dotencode is
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True.
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path is assumed to be all lowercase.
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>>> _auxencode('.foo/aux.txt/txt.aux/con/prn/nul/foo.', True)
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'~2efoo/au~78.txt/txt.aux/co~6e/pr~6e/nu~6c/foo~2e'
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>>> _auxencode('.com1com2/lpt9.lpt4.lpt1/conprn/foo.', False)
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'.com1com2/lp~749.lpt4.lpt1/conprn/foo~2e'
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>>> _auxencode('foo. ', True)
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'foo.~20'
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>>> _auxencode(' .foo', True)
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'~20.foo'
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'''
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res = []
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for n in path.split('/'):
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if n:
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base = n.split('.')[0]
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if base and (base in _winreservednames):
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# encode third letter ('aux' -> 'au~78')
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ec = "~%02x" % ord(n[2])
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n = n[0:2] + ec + n[3:]
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if n[-1] in '. ':
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# encode last period or space ('foo...' -> 'foo..~2e')
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n = n[:-1] + "~%02x" % ord(n[-1])
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if dotencode and n[0] in '. ':
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n = "~%02x" % ord(n[0]) + n[1:]
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res.append(n)
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return '/'.join(res)
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_maxstorepathlen = 120
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_dirprefixlen = 8
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_maxshortdirslen = 8 * (_dirprefixlen + 1) - 4
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def _hybridencode(path, auxencode):
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'''encodes path with a length limit
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Encodes all paths that begin with 'data/', according to the following.
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Default encoding (reversible):
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Encodes all uppercase letters 'X' as '_x'. All reserved or illegal
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characters are encoded as '~xx', where xx is the two digit hex code
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of the character (see encodefilename).
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Relevant path components consisting of Windows reserved filenames are
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masked by encoding the third character ('aux' -> 'au~78', see auxencode).
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Hashed encoding (not reversible):
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If the default-encoded path is longer than _maxstorepathlen, a
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non-reversible hybrid hashing of the path is done instead.
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This encoding uses up to _dirprefixlen characters of all directory
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levels of the lowerencoded path, but not more levels than can fit into
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_maxshortdirslen.
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Then follows the filler followed by the sha digest of the full path.
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The filler is the beginning of the basename of the lowerencoded path
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(the basename is everything after the last path separator). The filler
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is as long as possible, filling in characters from the basename until
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the encoded path has _maxstorepathlen characters (or all chars of the
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basename have been taken).
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The extension (e.g. '.i' or '.d') is preserved.
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The string 'data/' at the beginning is replaced with 'dh/', if the hashed
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encoding was used.
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'''
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if not path.startswith('data/'):
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return path
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# escape directories ending with .i and .d
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path = encodedir(path)
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ndpath = path[len('data/'):]
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res = 'data/' + auxencode(encodefilename(ndpath))
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if len(res) > _maxstorepathlen:
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digest = _sha(path).hexdigest()
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aep = auxencode(lowerencode(ndpath))
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_root, ext = os.path.splitext(aep)
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parts = aep.split('/')
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basename = parts[-1]
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sdirs = []
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for p in parts[:-1]:
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d = p[:_dirprefixlen]
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if d[-1] in '. ':
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# Windows can't access dirs ending in period or space
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d = d[:-1] + '_'
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t = '/'.join(sdirs) + '/' + d
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if len(t) > _maxshortdirslen:
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break
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sdirs.append(d)
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dirs = '/'.join(sdirs)
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if len(dirs) > 0:
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dirs += '/'
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res = 'dh/' + dirs + digest + ext
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spaceleft = _maxstorepathlen - len(res)
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if spaceleft > 0:
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filler = basename[:spaceleft]
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res = 'dh/' + dirs + filler + digest + ext
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return res
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def _calcmode(path):
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try:
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# files in .hg/ will be created using this mode
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mode = os.stat(path).st_mode
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# avoid some useless chmods
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if (0777 & ~util.umask) == (0777 & mode):
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mode = None
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except OSError:
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mode = None
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return mode
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_data = 'data 00manifest.d 00manifest.i 00changelog.d 00changelog.i phaseroots'
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class basicstore(object):
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'''base class for local repository stores'''
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def __init__(self, path, openertype):
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self.path = path
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self.createmode = _calcmode(path)
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op = openertype(self.path)
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op.createmode = self.createmode
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self.opener = scmutil.filteropener(op, encodedir)
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def join(self, f):
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return self.path + '/' + encodedir(f)
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def _walk(self, relpath, recurse):
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'''yields (unencoded, encoded, size)'''
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path = self.path
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if relpath:
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path += '/' + relpath
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striplen = len(self.path) + 1
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l = []
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if os.path.isdir(path):
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visit = [path]
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while visit:
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p = visit.pop()
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for f, kind, st in osutil.listdir(p, stat=True):
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fp = p + '/' + f
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if kind == stat.S_IFREG and f[-2:] in ('.d', '.i'):
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n = util.pconvert(fp[striplen:])
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l.append((decodedir(n), n, st.st_size))
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elif kind == stat.S_IFDIR and recurse:
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visit.append(fp)
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return sorted(l)
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def datafiles(self):
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return self._walk('data', True)
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def walk(self):
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'''yields (unencoded, encoded, size)'''
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# yield data files first
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for x in self.datafiles():
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yield x
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# yield manifest before changelog
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for x in reversed(self._walk('', False)):
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yield x
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def copylist(self):
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return ['requires'] + _data.split()
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def write(self):
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pass
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class encodedstore(basicstore):
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def __init__(self, path, openertype):
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self.path = path + '/store'
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self.createmode = _calcmode(self.path)
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op = openertype(self.path)
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op.createmode = self.createmode
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self.opener = scmutil.filteropener(op, encodefilename)
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def datafiles(self):
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for a, b, size in self._walk('data', True):
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try:
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a = decodefilename(a)
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except KeyError:
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a = None
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yield a, b, size
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def join(self, f):
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return self.path + '/' + encodefilename(f)
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def copylist(self):
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return (['requires', '00changelog.i'] +
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['store/' + f for f in _data.split()])
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class fncache(object):
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# the filename used to be partially encoded
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# hence the encodedir/decodedir dance
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def __init__(self, opener):
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self.opener = opener
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self.entries = None
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self._dirty = False
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def _load(self):
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'''fill the entries from the fncache file'''
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self._dirty = False
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try:
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fp = self.opener('fncache', mode='rb')
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except IOError:
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# skip nonexistent file
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self.entries = set()
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return
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self.entries = set(map(decodedir, fp.read().splitlines()))
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if '' in self.entries:
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fp.seek(0)
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for n, line in enumerate(fp):
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if not line.rstrip('\n'):
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t = _('invalid entry in fncache, line %s') % (n + 1)
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raise util.Abort(t)
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fp.close()
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def _write(self, files, atomictemp):
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fp = self.opener('fncache', mode='wb', atomictemp=atomictemp)
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if files:
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fp.write('\n'.join(map(encodedir, files)) + '\n')
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fp.close()
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self._dirty = False
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def rewrite(self, files):
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self._write(files, False)
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self.entries = set(files)
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def write(self):
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if self._dirty:
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self._write(self.entries, True)
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def add(self, fn):
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if self.entries is None:
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self._load()
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if fn not in self.entries:
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self._dirty = True
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self.entries.add(fn)
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def __contains__(self, fn):
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if self.entries is None:
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self._load()
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return fn in self.entries
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def __iter__(self):
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if self.entries is None:
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self._load()
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return iter(self.entries)
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class _fncacheopener(scmutil.abstractopener):
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def __init__(self, op, fnc, encode):
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self.opener = op
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self.fncache = fnc
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self.encode = encode
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def __call__(self, path, mode='r', *args, **kw):
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if mode not in ('r', 'rb') and path.startswith('data/'):
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self.fncache.add(path)
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return self.opener(self.encode(path), mode, *args, **kw)
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class fncachestore(basicstore):
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def __init__(self, path, openertype, encode):
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self.encode = encode
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self.path = path + '/store'
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self.createmode = _calcmode(self.path)
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op = openertype(self.path)
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op.createmode = self.createmode
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fnc = fncache(op)
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self.fncache = fnc
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self.opener = _fncacheopener(op, fnc, encode)
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def join(self, f):
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return self.path + '/' + self.encode(f)
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def datafiles(self):
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rewrite = False
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existing = []
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spath = self.path
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for f in self.fncache:
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ef = self.encode(f)
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try:
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st = os.stat(spath + '/' + ef)
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yield f, ef, st.st_size
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existing.append(f)
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except OSError:
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# nonexistent entry
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rewrite = True
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if rewrite:
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# rewrite fncache to remove nonexistent entries
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# (may be caused by rollback / strip)
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self.fncache.rewrite(existing)
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def copylist(self):
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d = ('data dh fncache phaseroots'
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' 00manifest.d 00manifest.i 00changelog.d 00changelog.i')
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return (['requires', '00changelog.i'] +
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['store/' + f for f in d.split()])
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def write(self):
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self.fncache.write()
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def store(requirements, path, openertype):
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if 'store' in requirements:
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if 'fncache' in requirements:
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auxencode = lambda f: _auxencode(f, 'dotencode' in requirements)
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encode = lambda f: _hybridencode(f, auxencode)
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return fncachestore(path, openertype, encode)
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return encodedstore(path, openertype)
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return basicstore(path, openertype)
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