hg: make cachedlocalrepo cache appropriate repoview object
Before this patch, 'cachedlocalrepo' always caches "visible" repoview
object, because 'cachedlocalrepo' uses "visible" repoview returned by
'hg.repository()' without any additional processing.
If the client of 'cachedlocalrepo' wants "served" repoview, some
objects to be cached are discarded unintentionally.
1. 'cachedlocalrepo' newly caches "visible" repoview object
(call it VIEW1)
2. 'cachedlocalrepo' returns VIEW1 to the client of it at 'fetch()'
3. the client gets "served" repoview object by 'filtered("served")'
on VIEW1 (call this "served" repoview VIEW2)
4. accessing to 'repo.changelog' implies:
- instantiation of changelog via 'localrepository.changelog'
- instantiation of "filtered changelog" via 'repoview.changelog'
5. "filtered changelog" above is cached in VIEW2
6. VIEW2 is discarded after processing, because there is no
reference to it
7. 'cachedlocalrepo' returns VIEW1 cached at (1) above to the
client at next 'fetch()'
8. 'filtered("served")' on VIEW1 at the client side creates new
"served" repoview again, because VIEW1 is "visible"
(call this new "served" repoview VIEW3)
9. accessing to 'repo.changelog' implies instantiation of filtered
changelog again, because "filtered changelog" is cached in
VIEW2 at (5), but not in VIEW3 currently used
10. (go to (7) above)
As described above, "served" repoview object and "filtered changelog"
cached in it are discarded always, even if the repository itself
hasn't been changed since last access.
For example, in the case of 'hgweb_mod.hgweb', "newly caching" occurs,
when:
- all cached objects are already assigned to another threads
(in this case, repoview is created in 'cachedlocalrepo.copy()')
- or, stat of '00changelog.i' is changed from last access
(in this case, repoview is created in 'cachedlocalrepo.fetch()')
once changes are pushed via HTTP, this always occurs.
The root cause of this inefficiency is that 'cachedlocalrepo' always
caches "visible" repoview object, even if the client of it wants
another view.
To make 'cachedlocalrepo' cache appropriate repoview object, this
patch adds additional filtering on the repo object returned by
'hg.repository()'. It is assumed that initial repoview object should
be already filtered by expected view.
After this patch:
- 'filtered("served")' on VIEW1 at (3)/(7) above returns VIEW1
itself, because VIEW1 is now "served", and
- VIEW2 and VIEW3 equal VIEW1
- therefore, "filtered changelog" is cached in VIEW1, and reused
intentionally
# win32mbcs.py -- MBCS filename support for Mercurial
#
# Copyright (c) 2008 Shun-ichi Goto <shunichi.goto@gmail.com>
#
# Version: 0.3
# Author: Shun-ichi Goto <shunichi.goto@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
#
'''allow the use of MBCS paths with problematic encodings
Some MBCS encodings are not good for some path operations (i.e.
splitting path, case conversion, etc.) with its encoded bytes. We call
such a encoding (i.e. shift_jis and big5) as "problematic encoding".
This extension can be used to fix the issue with those encodings by
wrapping some functions to convert to Unicode string before path
operation.
This extension is useful for:
- Japanese Windows users using shift_jis encoding.
- Chinese Windows users using big5 encoding.
- All users who use a repository with one of problematic encodings on
case-insensitive file system.
This extension is not needed for:
- Any user who use only ASCII chars in path.
- Any user who do not use any of problematic encodings.
Note that there are some limitations on using this extension:
- You should use single encoding in one repository.
- If the repository path ends with 0x5c, .hg/hgrc cannot be read.
- win32mbcs is not compatible with fixutf8 extension.
By default, win32mbcs uses encoding.encoding decided by Mercurial.
You can specify the encoding by config option::
[win32mbcs]
encoding = sjis
It is useful for the users who want to commit with UTF-8 log message.
'''
import os, sys
from mercurial.i18n import _
from mercurial import error, encoding
# Note for extension authors: ONLY specify testedwith = 'internal' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'internal'
_encoding = None # see extsetup
def decode(arg):
if isinstance(arg, str):
uarg = arg.decode(_encoding)
if arg == uarg.encode(_encoding):
return uarg
raise UnicodeError("Not local encoding")
elif isinstance(arg, tuple):
return tuple(map(decode, arg))
elif isinstance(arg, list):
return map(decode, arg)
elif isinstance(arg, dict):
for k, v in arg.items():
arg[k] = decode(v)
return arg
def encode(arg):
if isinstance(arg, unicode):
return arg.encode(_encoding)
elif isinstance(arg, tuple):
return tuple(map(encode, arg))
elif isinstance(arg, list):
return map(encode, arg)
elif isinstance(arg, dict):
for k, v in arg.items():
arg[k] = encode(v)
return arg
def appendsep(s):
# ensure the path ends with os.sep, appending it if necessary.
try:
us = decode(s)
except UnicodeError:
us = s
if us and us[-1] not in ':/\\':
s += os.sep
return s
def basewrapper(func, argtype, enc, dec, args, kwds):
# check check already converted, then call original
for arg in args:
if isinstance(arg, argtype):
return func(*args, **kwds)
try:
# convert string arguments, call func, then convert back the
# return value.
return enc(func(*dec(args), **dec(kwds)))
except UnicodeError:
raise error.Abort(_("[win32mbcs] filename conversion failed with"
" %s encoding\n") % (_encoding))
def wrapper(func, args, kwds):
return basewrapper(func, unicode, encode, decode, args, kwds)
def reversewrapper(func, args, kwds):
return basewrapper(func, str, decode, encode, args, kwds)
def wrapperforlistdir(func, args, kwds):
# Ensure 'path' argument ends with os.sep to avoids
# misinterpreting last 0x5c of MBCS 2nd byte as path separator.
if args:
args = list(args)
args[0] = appendsep(args[0])
if 'path' in kwds:
kwds['path'] = appendsep(kwds['path'])
return func(*args, **kwds)
def wrapname(name, wrapper):
module, name = name.rsplit('.', 1)
module = sys.modules[module]
func = getattr(module, name)
def f(*args, **kwds):
return wrapper(func, args, kwds)
try:
f.__name__ = func.__name__ # fails with Python 2.3
except Exception:
pass
setattr(module, name, f)
# List of functions to be wrapped.
# NOTE: os.path.dirname() and os.path.basename() are safe because
# they use result of os.path.split()
funcs = '''os.path.join os.path.split os.path.splitext
os.path.normpath os.makedirs
mercurial.util.endswithsep mercurial.util.splitpath mercurial.util.checkcase
mercurial.util.fspath mercurial.util.pconvert mercurial.util.normpath
mercurial.util.checkwinfilename mercurial.util.checkosfilename
mercurial.util.split'''
# These functions are required to be called with local encoded string
# because they expects argument is local encoded string and cause
# problem with unicode string.
rfuncs = '''mercurial.encoding.upper mercurial.encoding.lower'''
# List of Windows specific functions to be wrapped.
winfuncs = '''os.path.splitunc'''
# codec and alias names of sjis and big5 to be faked.
problematic_encodings = '''big5 big5-tw csbig5 big5hkscs big5-hkscs
hkscs cp932 932 ms932 mskanji ms-kanji shift_jis csshiftjis shiftjis
sjis s_jis shift_jis_2004 shiftjis2004 sjis_2004 sjis2004
shift_jisx0213 shiftjisx0213 sjisx0213 s_jisx0213 950 cp950 ms950 '''
def extsetup(ui):
# TODO: decide use of config section for this extension
if ((not os.path.supports_unicode_filenames) and
(sys.platform != 'cygwin')):
ui.warn(_("[win32mbcs] cannot activate on this platform.\n"))
return
# determine encoding for filename
global _encoding
_encoding = ui.config('win32mbcs', 'encoding', encoding.encoding)
# fake is only for relevant environment.
if _encoding.lower() in problematic_encodings.split():
for f in funcs.split():
wrapname(f, wrapper)
if os.name == 'nt':
for f in winfuncs.split():
wrapname(f, wrapper)
wrapname("mercurial.osutil.listdir", wrapperforlistdir)
# wrap functions to be called with local byte string arguments
for f in rfuncs.split():
wrapname(f, reversewrapper)
# Check sys.args manually instead of using ui.debug() because
# command line options is not yet applied when
# extensions.loadall() is called.
if '--debug' in sys.argv:
ui.write("[win32mbcs] activated with encoding: %s\n"
% _encoding)