from __future__ import absolute_import, print_function

import os

import stat

import subprocess

import sys

if subprocess.call(['python', '%s/hghave' % os.environ['TESTDIR'],

                    'cacheable']):

    sys.exit(80)

print_ = print

def print(*args, **kwargs):

    """print() wrapper that flushes stdout buffers to avoid py3 buffer issues

    We could also just write directly to sys.stdout.buffer the way the

    ui object will, but this was easier for porting the test.

    """

    print_(*args, **kwargs)

    sys.stdout.flush()

from mercurial import (

    extensions,

    hg,

    localrepo,

    pycompat,

    ui as uimod,

    util,

    vfs as vfsmod,

)

if pycompat.ispy3:

    xrange = range

class fakerepo(object):

    def __init__(self):

        self._filecache = {}

    class fakevfs(object):

        def join(self, p):

            return p

    vfs = fakevfs()

    def unfiltered(self):

        return self

    def sjoin(self, p):

        return p

    @localrepo.repofilecache('x', 'y')

    def cached(self):

        print('creating')

        return 'string from function'

    def invalidate(self):

        for k in self._filecache:

            try:

                delattr(self, pycompat.sysstr(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 = vfsmod.vfs(b'.')(b'x', b'w', atomictemp=True)

    f.write(b'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 = vfsmod.vfs(b'.')(b'y', b'w', atomictemp=True)

    f.write(b'B')

    f.close()

    repo.invalidate()

    print("* file y changed inode")

    repo.cached

    f = vfsmod.vfs(b'.')(b'x', b'w', atomictemp=True)

    f.write(b'c')

    f.close()

    f = vfsmod.vfs(b'.')(b'y', b'w', atomictemp=True)

    f.write(b'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(b'.')

    # 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(b'.')

def setbeforeget(repo):

    os.remove('x')

    os.remove('y')

    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.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[stat.ST_CTIME] != oldstat[stat.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 = vfsmod.checkambigatclosing(open(filename, 'a'))

            fp.write('FOO')

            fp.close()

            # implicit closing by "with" statement

            with vfsmod.checkambigatclosing(open(filename, 'a')) as fp:

                fp.write('BAR')

        newstat = os.stat(filename)

        if oldstat[stat.ST_CTIME] != newstat[stat.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[stat.ST_MTIME] + repetition * 2) & 0x7fffffff

        if newstat[stat.ST_MTIME] != expected:

            print("'newstat[stat.ST_MTIME] %s is not %s (as %s + %s * 2)" %

                  (newstat[stat.ST_MTIME], expected,

                   oldstat[stat.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()