server/utils.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 25 Sep 2009 11:57:31 +0200
changeset 3484 52e6c8d62ac6
parent 2708 60d728bdcba5
child 3585 cd437d24aa65
permissions -rw-r--r--
fix some actions selectors
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"""Some utilities for the CubicWeb server.
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:organization: Logilab
1977
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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import sys
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import string
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from threading import Timer, Thread
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from getpass import getpass
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from random import choice
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from logilab.common.configuration import Configuration
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from cubicweb.server import SOURCE_TYPES
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try:
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    from crypt import crypt
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except ImportError:
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    # crypt is not available (eg windows)
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    from cubicweb.md5crypt import crypt
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def getsalt(chars=string.letters + string.digits):
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    """generate a random 2-character 'salt'"""
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    return choice(chars) + choice(chars)
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def crypt_password(passwd, salt=None):
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    """return the encrypted password using the given salt or a generated one
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    """
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    if passwd is None:
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        return None
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    if salt is None:
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        salt = getsalt()
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    return crypt(passwd, salt)
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def cartesian_product(seqin):
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    """returns a generator which returns the cartesian product of `seqin`
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    for more details, see :
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    http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/302478
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    """
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    def rloop(seqin, comb):
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        """recursive looping function"""
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        if seqin:                   # any more sequences to process?
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            for item in seqin[0]:
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                newcomb = comb + [item]     # add next item to current combination
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                # call rloop w/ remaining seqs, newcomb
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                for item in rloop(seqin[1:], newcomb):
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                    yield item          # seqs and newcomb
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        else:                           # processing last sequence
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            yield comb                  # comb finished, add to list
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    return rloop(seqin, [])
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def cleanup_solutions(rqlst, solutions):
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    for sol in solutions:
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        for vname in sol.keys():
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            if not (vname in rqlst.defined_vars or vname in rqlst.aliases):
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                del sol[vname]
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DEFAULT_MSG = 'we need a manager connection on the repository \
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(the server doesn\'t have to run, even should better not)'
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def manager_userpasswd(user=None, msg=DEFAULT_MSG, confirm=False,
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                       passwdmsg='password'):
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    if not user:
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        print msg
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        while not user:
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            user = raw_input('login: ')
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        user = unicode(user, sys.stdin.encoding)
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    passwd = getpass('%s: ' % passwdmsg)
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    if confirm:
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        while True:
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            passwd2 = getpass('confirm password: ')
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            if passwd == passwd2:
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                break
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            print 'password doesn\'t match'
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            passwd = getpass('password: ')
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    # XXX decode password using stdin encoding then encode it using appl'encoding
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    return user, passwd
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def ask_source_config(sourcetype, inputlevel=0):
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    sconfig = Configuration(options=SOURCE_TYPES[sourcetype].options)
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    sconfig.adapter = sourcetype
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    sconfig.input_config(inputlevel=inputlevel)
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    return sconfig
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class LoopTask(object):
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    """threaded task restarting itself once executed"""
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    def __init__(self, interval, func, args):
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        self.interval = interval
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        def auto_restart_func(self=self, func=func, args=args):
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            try:
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                func(*args)
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            finally:
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                self.start()
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        self.func = auto_restart_func
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        self.name = func.__name__
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    def start(self):
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        self._t = Timer(self.interval, self.func)
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        self._t.start()
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    def cancel(self):
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        self._t.cancel()
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    def join(self):
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        self._t.join()
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class RepoThread(Thread):
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    """subclass of thread so it auto remove itself from a given list once
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    executed
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    """
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    def __init__(self, target, running_threads):
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        def auto_remove_func(self=self, func=target):
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            try:
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                func()
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            finally:
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                self.running_threads.remove(self)
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        Thread.__init__(self, target=auto_remove_func)
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        self.running_threads = running_threads
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        self._name = target.__name__
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    def start(self):
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        self.running_threads.append(self)
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        Thread.start(self)
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    @property
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    def name(self):
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        return '%s(%s)' % (self._name, Thread.getName(self))