branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
# loggingutil.py - utility for logging events
#
# Copyright 2010 Nicolas Dumazet
# 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.
import errno
from . import (
encoding,
)
from .utils import (
dateutil,
procutil,
stringutil,
)
def openlogfile(ui, vfs, name, maxfiles=0, maxsize=0):
"""Open log file in append mode, with optional rotation
If maxsize > 0, the log file will be rotated up to maxfiles.
"""
def rotate(oldpath, newpath):
try:
vfs.unlink(newpath)
except OSError as err:
if err.errno != errno.ENOENT:
ui.debug(
b"warning: cannot remove '%s': %s\n"
% (newpath, encoding.strtolocal(err.strerror))
)
try:
if newpath:
vfs.rename(oldpath, newpath)
except OSError as err:
if err.errno != errno.ENOENT:
ui.debug(
b"warning: cannot rename '%s' to '%s': %s\n"
% (newpath, oldpath, encoding.strtolocal(err.strerror))
)
if maxsize > 0:
try:
st = vfs.stat(name)
except OSError:
pass
else:
if st.st_size >= maxsize:
path = vfs.join(name)
for i in range(maxfiles - 1, 1, -1):
rotate(
oldpath=b'%s.%d' % (path, i - 1),
newpath=b'%s.%d' % (path, i),
)
rotate(oldpath=path, newpath=maxfiles > 0 and path + b'.1')
return vfs(name, b'a', makeparentdirs=False)
def _formatlogline(msg):
date = dateutil.datestr(format=b'%Y/%m/%d %H:%M:%S')
pid = procutil.getpid()
return b'%s (%d)> %s' % (date, pid, msg)
def _matchevent(event, tracked):
return b'*' in tracked or event in tracked
class filelogger:
"""Basic logger backed by physical file with optional rotation"""
def __init__(self, vfs, name, tracked, maxfiles=0, maxsize=0):
self._vfs = vfs
self._name = name
self._trackedevents = set(tracked)
self._maxfiles = maxfiles
self._maxsize = maxsize
def tracked(self, event):
return _matchevent(event, self._trackedevents)
def log(self, ui, event, msg, opts):
line = _formatlogline(msg)
try:
with openlogfile(
ui,
self._vfs,
self._name,
maxfiles=self._maxfiles,
maxsize=self._maxsize,
) as fp:
fp.write(line)
except IOError as err:
ui.debug(
b'cannot write to %s: %s\n'
% (self._name, stringutil.forcebytestr(err))
)
class fileobjectlogger:
"""Basic logger backed by file-like object"""
def __init__(self, fp, tracked):
self._fp = fp
self._trackedevents = set(tracked)
def tracked(self, event):
return _matchevent(event, self._trackedevents)
def log(self, ui, event, msg, opts):
line = _formatlogline(msg)
try:
self._fp.write(line)
self._fp.flush()
except IOError as err:
ui.debug(
b'cannot write to %s: %s\n'
% (
stringutil.forcebytestr(self._fp.name),
stringutil.forcebytestr(err),
)
)
class proxylogger:
"""Forward log events to another logger to be set later"""
def __init__(self):
self.logger = None
def tracked(self, event):
return self.logger is not None and self.logger.tracked(event)
def log(self, ui, event, msg, opts):
assert self.logger is not None
self.logger.log(ui, event, msg, opts)