localrepo: avoid unnecessary conversion from node to rev
changelog.heads() first calls headrevs then converts them to nodes.
localrepo.heads() then sorts them using self.changelog.rev function and makes
useless conversion back to revs. Instead let's call changelog.headrevs() from
localrepo.heads(), sort the output and then convert to nodes. Because headrevs
does not support start parameter this optimization only works if start is None.
from __future__ import absolute_import, print_function
import os
import subprocess
import sys
if subprocess.call(['python', '%s/hghave' % os.environ['TESTDIR'],
'cacheable']):
sys.exit(80)
from mercurial import (
extensions,
hg,
scmutil,
ui as uimod,
util,
)
filecache = scmutil.filecache
class fakerepo(object):
def __init__(self):
self._filecache = {}
def join(self, p):
return p
def sjoin(self, p):
return p
@filecache('x', 'y')
def cached(self):
print('creating')
return 'string from function'
def invalidate(self):
for k in self._filecache:
try:
delattr(self, k)
except AttributeError:
pass
def basic(repo):
print("* neither file exists")
# calls function
repo.cached
repo.invalidate()
print("* neither file still exists")
# uses cache
repo.cached
# create empty file
f = open('x', 'w')
f.close()
repo.invalidate()
print("* empty file x created")
# should recreate the object
repo.cached
f = open('x', 'w')
f.write('a')
f.close()
repo.invalidate()
print("* file x changed size")
# should recreate the object
repo.cached
repo.invalidate()
print("* nothing changed with either file")
# stats file again, reuses object
repo.cached
# atomic replace file, size doesn't change
# hopefully st_mtime doesn't change as well so this doesn't use the cache
# because of inode change
f = scmutil.opener('.')('x', 'w', atomictemp=True)
f.write('b')
f.close()
repo.invalidate()
print("* file x changed inode")
repo.cached
# create empty file y
f = open('y', 'w')
f.close()
repo.invalidate()
print("* empty file y created")
# should recreate the object
repo.cached
f = open('y', 'w')
f.write('A')
f.close()
repo.invalidate()
print("* file y changed size")
# should recreate the object
repo.cached
f = scmutil.opener('.')('y', 'w', atomictemp=True)
f.write('B')
f.close()
repo.invalidate()
print("* file y changed inode")
repo.cached
f = scmutil.opener('.')('x', 'w', atomictemp=True)
f.write('c')
f.close()
f = scmutil.opener('.')('y', 'w', atomictemp=True)
f.write('C')
f.close()
repo.invalidate()
print("* both files changed inode")
repo.cached
def fakeuncacheable():
def wrapcacheable(orig, *args, **kwargs):
return False
def wrapinit(orig, *args, **kwargs):
pass
originit = extensions.wrapfunction(util.cachestat, '__init__', wrapinit)
origcacheable = extensions.wrapfunction(util.cachestat, 'cacheable',
wrapcacheable)
for fn in ['x', 'y']:
try:
os.remove(fn)
except OSError:
pass
basic(fakerepo())
util.cachestat.cacheable = origcacheable
util.cachestat.__init__ = originit
def test_filecache_synced():
# test old behavior that caused filecached properties to go out of sync
os.system('hg init && echo a >> a && hg ci -qAm.')
repo = hg.repository(uimod.ui.load())
# first rollback clears the filecache, but changelog to stays in __dict__
repo.rollback()
repo.commit('.')
# second rollback comes along and touches the changelog externally
# (file is moved)
repo.rollback()
# but since changelog isn't under the filecache control anymore, we don't
# see that it changed, and return the old changelog without reconstructing
# it
repo.commit('.')
def setbeforeget(repo):
os.remove('x')
os.remove('y')
repo.cached = 'string set externally'
repo.invalidate()
print("* neither file exists")
print(repo.cached)
repo.invalidate()
f = open('x', 'w')
f.write('a')
f.close()
print("* file x created")
print(repo.cached)
repo.cached = 'string 2 set externally'
repo.invalidate()
print("* string set externally again")
print(repo.cached)
repo.invalidate()
f = open('y', 'w')
f.write('b')
f.close()
print("* file y created")
print(repo.cached)
def antiambiguity():
filename = 'ambigcheck'
# try some times, because reproduction of ambiguity depends on
# "filesystem time"
for i in xrange(5):
fp = open(filename, 'w')
fp.write('FOO')
fp.close()
oldstat = os.stat(filename)
if oldstat.st_ctime != oldstat.st_mtime:
# subsequent changing never causes ambiguity
continue
repetition = 3
# repeat changing via checkambigatclosing, to examine whether
# st_mtime is advanced multiple times as expected
for i in xrange(repetition):
# explicit closing
fp = scmutil.checkambigatclosing(open(filename, 'a'))
fp.write('FOO')
fp.close()
# implicit closing by "with" statement
with scmutil.checkambigatclosing(open(filename, 'a')) as fp:
fp.write('BAR')
newstat = os.stat(filename)
if oldstat.st_ctime != newstat.st_ctime:
# timestamp ambiguity was naturally avoided while repetition
continue
# st_mtime should be advanced "repetition * 2" times, because
# all changes occurred at same time (in sec)
expected = (oldstat.st_mtime + repetition * 2) & 0x7fffffff
if newstat.st_mtime != expected:
print("'newstat.st_mtime %s is not %s (as %s + %s * 2)" %
(newstat.st_mtime, expected, oldstat.st_mtime, repetition))
# no more examination is needed regardless of result
break
else:
# This platform seems too slow to examine anti-ambiguity
# of file timestamp (or test happened to be executed at
# bad timing). Exit silently in this case, because running
# on other faster platforms can detect problems
pass
print('basic:')
print()
basic(fakerepo())
print()
print('fakeuncacheable:')
print()
fakeuncacheable()
test_filecache_synced()
print()
print('setbeforeget:')
print()
setbeforeget(fakerepo())
print()
print('antiambiguity:')
print()
antiambiguity()