server/utils.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 22 Sep 2011 10:02:25 +0200
branchstable
changeset 7823 5f145462e041
parent 7815 2a164a9cf81c
child 8317 9c59258e7798
child 8320 cd2d332b3063
permissions -rw-r--r--
[repo] ensure we don't restart a task while the repo is shutting down (closes #1942736) we need a safety belt in cw itself again looping task which use 'try / except' or doesn't need to access the db (which will trigger ShuttingDown exception)
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Some utilities for the CubicWeb server."""
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0
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__docformat__ = "restructuredtext en"
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import sys
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import string
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import logging
0
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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 cubicweb.server import SOURCE_TYPES
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0
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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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def eschema_eid(session, eschema):
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    """get eid of the CWEType entity for the given yams type. You should use
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    this because when schema has been loaded from the file-system, not from the
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    database, (e.g. during tests), eschema.eid is not set.
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    """
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    if eschema.eid is None:
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        eschema.eid = session.execute(
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            'Any X WHERE X is CWEType, X name %(name)s',
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            {'name': str(eschema)})[0][0]
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    return eschema.eid
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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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        if msg:
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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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_MARKER=object()
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def func_name(func):
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    name = getattr(func, '__name__', _MARKER)
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    if name is _MARKER:
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        name = getattr(func, 'func_name', _MARKER)
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    if name is _MARKER:
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        name = repr(func)
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    return name
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class LoopTask(object):
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    """threaded task restarting itself once executed"""
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    def __init__(self, repo, interval, func, args):
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        if interval <= 0:
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            raise ValueError('Loop task interval must be > 0 '
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                             '(current value: %f for %s)' % \
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                             (interval, func_name(func)))
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        self.repo = repo
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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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            restart = True
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            try:
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                func(*args)
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            except Exception:
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                logger = logging.getLogger('cubicweb.repository')
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                logger.exception('Unhandled exception in LoopTask %s', self.name)
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                raise
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            except BaseException:
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                restart = False
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            finally:
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                if restart and not self.repo.shutting_down:
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                    self.start()
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        self.func = auto_restart_func
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        self.name = func_name(func)
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    def __str__(self):
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        return '%s (%s seconds)' % (self.name, self.interval)
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    def start(self):
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        self._t = Timer(self.interval, self.func)
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        self._t.setName('%s-%s[%d]' % (self._t.getName(), self.name, self.interval))
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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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        if self._t.isAlive():
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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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            except Exception:
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                logger = logging.getLogger('cubicweb.repository')
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                logger.exception('Unhandled exception in RepoThread %s', self._name)
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                raise
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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 = func_name(target)
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    def start(self):
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        self.running_threads.append(self)
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        self.daemon = True
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        Thread.start(self)
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    def getName(self):
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        return '%s(%s)' % (self._name, Thread.getName(self))