return hashlib.sha1(username + salt).hexdigest()

def safe_unicode(str_, from_encoding='utf8'):

    """

    safe unicode function. Does few trick to turn str_ into unicode

    In case of UnicodeDecode error we try to return it with encoding detected

    by chardet library if it fails fallback to unicode with errors replaced

    :param str_: string to decode

    :rtype: unicode

    :returns: unicode object

    """

    if isinstance(str_, unicode):

        return str_

    try:

        return unicode(str_)

    except UnicodeDecodeError:

        pass

    try:

        return unicode(str_, from_encoding)

    except UnicodeDecodeError:

        pass

    try:

        import chardet

        encoding = chardet.detect(str_)['encoding']

        if encoding is None:

            raise Exception()

        return str_.decode(encoding)

    except (ImportError, UnicodeDecodeError, Exception):

        return unicode(str_, from_encoding, 'replace')

def safe_str(unicode_, to_encoding='utf8'):

    """

    safe str function. Does few trick to turn unicode_ into string

    In case of UnicodeEncodeError we try to return it with encoding detected

    by chardet library if it fails fallback to string with errors replaced

    :param unicode_: unicode to encode

    :rtype: str

    :returns: str object

    """

    if isinstance(unicode_, str):

        return unicode_

    try:

        return unicode_.encode(to_encoding)

    except UnicodeEncodeError:

        pass

    try:

        import chardet

        encoding = chardet.detect(unicode_)['encoding']

        print encoding

        if encoding is None:

            raise UnicodeEncodeError()

        return unicode_.encode(encoding)

    except (ImportError, UnicodeEncodeError):

        return unicode_.encode(to_encoding, 'replace')

    return safe_str

def engine_from_config(configuration, prefix='sqlalchemy.', **kwargs):

    """

    Custom engine_from_config functions that makes sure we use NullPool for

    file based sqlite databases. This prevents errors on sqlite. This only 

    applies to sqlalchemy versions < 0.7.0

    """

    import sqlalchemy

    from sqlalchemy import engine_from_config as efc

    import logging

    if int(sqlalchemy.__version__.split('.')[1]) < 7:

        # This solution should work for sqlalchemy < 0.7.0, and should use

        # proxy=TimerProxy() for execution time profiling

        from sqlalchemy.pool import NullPool

        url = configuration[prefix + 'url']

        if url.startswith('sqlite'):

            kwargs.update({'poolclass': NullPool})

        return efc(configuration, prefix, **kwargs)

    else:

        import time

# -*- coding: utf-8 -*-

"""

    rhodecode.lib.celerylib.__init__

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    celery libs for RhodeCode

    :created_on: Nov 27, 2010

    :author: marcink

    :copyright: (C) 2009-2011 Marcin Kuzminski <marcin@python-works.com>

    :license: GPLv3, see COPYING for more details.

"""

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import os

import sys

import socket

import traceback

import logging

from os.path import dirname as dn, join as jn

from hashlib import md5

from decorator import decorator

from pylons import  config

from vcs.utils.lazy import LazyProperty

from rhodecode.lib.pidlock import DaemonLock, LockHeld

from celery.messaging import establish_connection

log = logging.getLogger(__name__)

try:

    CELERY_ON = str2bool(config['app_conf'].get('use_celery'))

except KeyError:

    CELERY_ON = False

class ResultWrapper(object):

    def __init__(self, task):

        self.task = task

    @LazyProperty

    def result(self):

        return self.task

def run_task(task, *args, **kwargs):

    if CELERY_ON:

        try:

            t = task.apply_async(args=args, kwargs=kwargs)

            log.info('running task %s:%s', t.task_id, task)

            return t

        except socket.error, e:

            if isinstance(e, IOError) and e.errno == 111:

                log.debug('Unable to connect to celeryd. Sync execution')

            else:

                log.error(traceback.format_exc())

        except KeyError, e:

                log.debug('Unable to connect to celeryd. Sync execution')

        except Exception, e:

            log.error(traceback.format_exc())

    log.debug('executing task %s in sync mode', task)

    return ResultWrapper(task(*args, **kwargs))

def __get_lockkey(func, *fargs, **fkwargs):

    params = list(fargs)

    params.extend(['%s-%s' % ar for ar in fkwargs.items()])

    func_name = str(func.__name__) if hasattr(func, '__name__') else str(func)

    lockkey = 'task_%s.lock' % \

    return lockkey

def locked_task(func):

    def __wrapper(func, *fargs, **fkwargs):

        lockkey = __get_lockkey(func, *fargs, **fkwargs)

        lockkey_path = config['here']

        log.info('running task with lockkey %s', lockkey)

        try:

            l = DaemonLock(file_=jn(lockkey_path, lockkey))

            ret = func(*fargs, **fkwargs)

            l.release()

            return ret

        except LockHeld:

            log.info('LockHeld')

            return 'Task with key %s already running' % lockkey

    return decorator(__wrapper, func)