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revisionbranchcache: fall back to slow path if starting readonly (issue4531)...
revisionbranchcache: fall back to slow path if starting readonly (issue4531) Transitioning to Mercurial versions with revision branch cache could be slow as long as all operations were readonly (revset queries) and the cache would be populated but not written back. Instead, fall back to using the consistently slow path when readonly and the cache doesn't exist yet. That avoids the overhead of populating the cache without writing it back. If not readonly, it will still populate all missing entries initially. That avoids repeated writing of the cache file with small updates, and it also makes sure a fully populated cache available for the readonly operations.

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r23877:7cc77030 default
r24159:5b4ed033 3.3.1 stable
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blackbox.py
158 lines | 5.1 KiB | text/x-python | PythonLexer
Bryan O'Sullivan
blackbox: fix copyright
r18676 # blackbox.py - log repository events to a file for post-mortem debugging
Durham Goode
blackbox: adds a blackbox extension...
r18669 #
Bryan O'Sullivan
blackbox: fix copyright
r18676 # Copyright 2010 Nicolas Dumazet
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r18669 # Copyright 2013 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""log repository events to a blackbox for debugging
Logs event information to .hg/blackbox.log to help debug and diagnose problems.
The events that get logged can be configured via the blackbox.track config key.
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blackbox: fix literal block syntax
r19162 Examples::
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r18669
[blackbox]
track = *
[blackbox]
track = command, commandfinish, commandexception, exthook, pythonhook
[blackbox]
track = incoming
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r19066 [blackbox]
# limit the size of a log file
maxsize = 1.5 MB
# rotate up to N log files when the current one gets too big
maxfiles = 3
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r18669 """
from mercurial import util, cmdutil
from mercurial.i18n import _
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r19066 import errno, os, re
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r18669
cmdtable = {}
command = cmdutil.command(cmdtable)
testedwith = 'internal'
lastblackbox = None
def wrapui(ui):
class blackboxui(ui.__class__):
@util.propertycache
def track(self):
Bryan O'Sullivan
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r19052 return self.configlist('blackbox', 'track', ['*'])
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r18669
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r19066 def _openlogfile(self):
def rotate(oldpath, newpath):
try:
os.unlink(newpath)
except OSError, err:
if err.errno != errno.ENOENT:
self.debug("warning: cannot remove '%s': %s\n" %
(newpath, err.strerror))
try:
if newpath:
os.rename(oldpath, newpath)
except OSError, err:
if err.errno != errno.ENOENT:
self.debug("warning: cannot rename '%s' to '%s': %s\n" %
(newpath, oldpath, err.strerror))
fp = self._bbopener('blackbox.log', 'a')
maxsize = self.configbytes('blackbox', 'maxsize', 1048576)
if maxsize > 0:
st = os.fstat(fp.fileno())
if st.st_size >= maxsize:
path = fp.name
fp.close()
maxfiles = self.configint('blackbox', 'maxfiles', 7)
for i in xrange(maxfiles - 1, 1, -1):
rotate(oldpath='%s.%d' % (path, i - 1),
newpath='%s.%d' % (path, i))
rotate(oldpath=path,
newpath=maxfiles > 0 and path + '.1')
fp = self._bbopener('blackbox.log', 'a')
return fp
Durham Goode
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r18669 def log(self, event, *msg, **opts):
global lastblackbox
super(blackboxui, self).log(event, *msg, **opts)
if not '*' in self.track and not event in self.track:
return
if util.safehasattr(self, '_blackbox'):
blackbox = self._blackbox
Bryan O'Sullivan
blackbox: defer opening a log file until needed (issue3869)...
r18831 elif util.safehasattr(self, '_bbopener'):
try:
Bryan O'Sullivan
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r19066 self._blackbox = self._openlogfile()
Bryan O'Sullivan
blackbox: defer opening a log file until needed (issue3869)...
r18831 except (IOError, OSError), err:
self.debug('warning: cannot write to blackbox.log: %s\n' %
err.strerror)
del self._bbopener
self._blackbox = None
blackbox = self._blackbox
Durham Goode
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r18669 else:
# certain ui instances exist outside the context of
# a repo, so just default to the last blackbox that
# was seen.
blackbox = lastblackbox
if blackbox:
date = util.datestr(None, '%Y/%m/%d %H:%M:%S')
Bryan O'Sullivan
blackbox: use util.getuser for portability...
r18787 user = util.getuser()
Durham Goode
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r18669 formattedmsg = msg[0] % msg[1:]
Bryan O'Sullivan
blackbox: prevent failed I/O from causing hg to abort...
r18786 try:
blackbox.write('%s %s> %s' % (date, user, formattedmsg))
except IOError, err:
self.debug('warning: cannot write to blackbox.log: %s\n' %
err.strerror)
Durham Goode
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r18669 lastblackbox = blackbox
def setrepo(self, repo):
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r23877 self._bbopener = repo.vfs
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r18669
ui.__class__ = blackboxui
def uisetup(ui):
wrapui(ui)
def reposetup(ui, repo):
# During 'hg pull' a httppeer repo is created to represent the remote repo.
# It doesn't have a .hg directory to put a blackbox in, so we don't do
# the blackbox setup for it.
if not repo.local():
return
Durham Goode
blackbox: fix blackbox causing exceptions in tests...
r19230 if util.safehasattr(ui, 'setrepo'):
ui.setrepo(repo)
Durham Goode
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r18673
@command('^blackbox',
[('l', 'limit', 10, _('the number of events to show')),
],
_('hg blackbox [OPTION]...'))
def blackbox(ui, repo, *revs, **opts):
'''view the recent repository events
'''
if not os.path.exists(repo.join('blackbox.log')):
return
limit = opts.get('limit')
Angel Ezquerra
localrepo: remove all external users of localrepo.opener...
r23877 blackbox = repo.vfs('blackbox.log', 'r')
Durham Goode
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r18673 lines = blackbox.read().split('\n')
count = 0
output = []
for line in reversed(lines):
if count >= limit:
break
# count the commands by matching lines like: 2013/01/23 19:13:36 root>
if re.match('^\d{4}/\d{2}/\d{2} \d{2}:\d{2}:\d{2} .*> .*', line):
count += 1
output.append(line)
ui.status('\n'.join(reversed(output)))