streamclone: clear caches after writing changes into files for visibility
Before this patch, streamclone-ed changes are invisible via @filecache
properties to in-process procedures before closing transaction
(e.g. pretxnclose python hook), if corresponded property is cached
before consumev1(). Strictly speaking, caching should occur inside
(store) lock for transaction.
repo.invalidate() after closing transaction is too late to force
@filecache properties to be reloaded from changed files at next
access.
For visibility of streamclone-ed changes to in-process procedures
before closing transaction, this patch clears caches just after
writing changes into files.
BTW, regardless of changing in this patch, clearing cached properties
in consumev1() causes inconsistency, if (1) transaction is started and
(2) any @filecache property is changed before consumev1().
This patch also adds the comment to fix this (potential) inconsistency
in the future.
# Copyright 2011 Fog Creek Software
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
import os
import re
from mercurial.i18n import _
from mercurial import (
error,
httppeer,
util,
wireproto,
)
from . import (
lfutil,
)
urlerr = util.urlerr
urlreq = util.urlreq
LARGEFILES_REQUIRED_MSG = ('\nThis repository uses the largefiles extension.'
'\n\nPlease enable it in your Mercurial config '
'file.\n')
# these will all be replaced by largefiles.uisetup
capabilitiesorig = None
ssholdcallstream = None
httpoldcallstream = None
def putlfile(repo, proto, sha):
'''Server command for putting a largefile into a repository's local store
and into the user cache.'''
proto.redirect()
path = lfutil.storepath(repo, sha)
util.makedirs(os.path.dirname(path))
tmpfp = util.atomictempfile(path, createmode=repo.store.createmode)
try:
proto.getfile(tmpfp)
tmpfp._fp.seek(0)
if sha != lfutil.hexsha1(tmpfp._fp):
raise IOError(0, _('largefile contents do not match hash'))
tmpfp.close()
lfutil.linktousercache(repo, sha)
except IOError as e:
repo.ui.warn(_('largefiles: failed to put %s into store: %s\n') %
(sha, e.strerror))
return wireproto.pushres(1)
finally:
tmpfp.discard()
return wireproto.pushres(0)
def getlfile(repo, proto, sha):
'''Server command for retrieving a largefile from the repository-local
cache or user cache.'''
filename = lfutil.findfile(repo, sha)
if not filename:
raise error.Abort(_('requested largefile %s not present in cache')
% sha)
f = open(filename, 'rb')
length = os.fstat(f.fileno())[6]
# Since we can't set an HTTP content-length header here, and
# Mercurial core provides no way to give the length of a streamres
# (and reading the entire file into RAM would be ill-advised), we
# just send the length on the first line of the response, like the
# ssh proto does for string responses.
def generator():
yield '%d\n' % length
for chunk in util.filechunkiter(f):
yield chunk
return wireproto.streamres(generator())
def statlfile(repo, proto, sha):
'''Server command for checking if a largefile is present - returns '2\n' if
the largefile is missing, '0\n' if it seems to be in good condition.
The value 1 is reserved for mismatched checksum, but that is too expensive
to be verified on every stat and must be caught be running 'hg verify'
server side.'''
filename = lfutil.findfile(repo, sha)
if not filename:
return '2\n'
return '0\n'
def wirereposetup(ui, repo):
class lfileswirerepository(repo.__class__):
def putlfile(self, sha, fd):
# unfortunately, httprepository._callpush tries to convert its
# input file-like into a bundle before sending it, so we can't use
# it ...
if issubclass(self.__class__, httppeer.httppeer):
res = self._call('putlfile', data=fd, sha=sha,
headers={'content-type':'application/mercurial-0.1'})
try:
d, output = res.split('\n', 1)
for l in output.splitlines(True):
self.ui.warn(_('remote: '), l) # assume l ends with \n
return int(d)
except ValueError:
self.ui.warn(_('unexpected putlfile response: %r\n') % res)
return 1
# ... but we can't use sshrepository._call because the data=
# argument won't get sent, and _callpush does exactly what we want
# in this case: send the data straight through
else:
try:
ret, output = self._callpush("putlfile", fd, sha=sha)
if ret == "":
raise error.ResponseError(_('putlfile failed:'),
output)
return int(ret)
except IOError:
return 1
except ValueError:
raise error.ResponseError(
_('putlfile failed (unexpected response):'), ret)
def getlfile(self, sha):
"""returns an iterable with the chunks of the file with sha sha"""
stream = self._callstream("getlfile", sha=sha)
length = stream.readline()
try:
length = int(length)
except ValueError:
self._abort(error.ResponseError(_("unexpected response:"),
length))
# SSH streams will block if reading more than length
for chunk in util.filechunkiter(stream, 128 * 1024, length):
yield chunk
# HTTP streams must hit the end to process the last empty
# chunk of Chunked-Encoding so the connection can be reused.
if issubclass(self.__class__, httppeer.httppeer):
chunk = stream.read(1)
if chunk:
self._abort(error.ResponseError(_("unexpected response:"),
chunk))
@wireproto.batchable
def statlfile(self, sha):
f = wireproto.future()
result = {'sha': sha}
yield result, f
try:
yield int(f.value)
except (ValueError, urlerr.httperror):
# If the server returns anything but an integer followed by a
# newline, newline, it's not speaking our language; if we get
# an HTTP error, we can't be sure the largefile is present;
# either way, consider it missing.
yield 2
repo.__class__ = lfileswirerepository
# advertise the largefiles=serve capability
def capabilities(repo, proto):
'''Wrap server command to announce largefile server capability'''
return capabilitiesorig(repo, proto) + ' largefiles=serve'
def heads(repo, proto):
'''Wrap server command - largefile capable clients will know to call
lheads instead'''
if lfutil.islfilesrepo(repo):
return wireproto.ooberror(LARGEFILES_REQUIRED_MSG)
return wireproto.heads(repo, proto)
def sshrepocallstream(self, cmd, **args):
if cmd == 'heads' and self.capable('largefiles'):
cmd = 'lheads'
if cmd == 'batch' and self.capable('largefiles'):
args['cmds'] = args['cmds'].replace('heads ', 'lheads ')
return ssholdcallstream(self, cmd, **args)
headsre = re.compile(r'(^|;)heads\b')
def httprepocallstream(self, cmd, **args):
if cmd == 'heads' and self.capable('largefiles'):
cmd = 'lheads'
if cmd == 'batch' and self.capable('largefiles'):
args['cmds'] = headsre.sub('lheads', args['cmds'])
return httpoldcallstream(self, cmd, **args)