_exceptions.py
author Julien Cristau <julien.cristau@logilab.fr>
Tue, 24 Nov 2015 14:08:47 +0100
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# copyright 2003-2013 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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"""Exceptions shared by different cubicweb packages."""
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__docformat__ = "restructuredtext en"
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from warnings import warn
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from six import PY3, text_type
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from logilab.common.decorators import cachedproperty
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from yams import ValidationError
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# abstract exceptions #########################################################
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class CubicWebException(Exception):
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    """base class for cubicweb server exception"""
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    msg = ""
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    def __unicode__(self):
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        if self.msg:
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            if self.args:
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                return self.msg % tuple(self.args)
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            else:
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                return self.msg
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        else:
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            return u' '.join(text_type(arg) for arg in self.args)
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    __str__ = __unicode__ if PY3 else lambda self: self.__unicode__().encode('utf-8')
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class ConfigurationError(CubicWebException):
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    """a misconfiguration error"""
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class InternalError(CubicWebException):
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    """base class for exceptions which should not occur"""
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class SecurityError(CubicWebException):
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    """base class for cubicweb server security exceptions"""
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class RepositoryError(CubicWebException):
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    """base class for repository exceptions"""
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class SourceException(CubicWebException):
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    """base class for source exceptions"""
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class CubicWebRuntimeError(CubicWebException):
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    """base class for runtime exceptions"""
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# repository exceptions #######################################################
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class ConnectionError(RepositoryError):
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    """raised when a bad connection id is given or when an attempt to establish
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    a connection failed
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    """
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class AuthenticationError(ConnectionError):
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    """raised when an attempt to establish a connection failed due to wrong
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    connection information (login / password or other authentication token)
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    """
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class BadConnectionId(ConnectionError):
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    """raised when a bad connection id is given"""
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class UnknownEid(RepositoryError):
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    """the eid is not defined in the system tables"""
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    msg = 'No entity with eid %s in the repository'
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class UniqueTogetherError(RepositoryError):
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    """raised when a unique_together constraint caused an IntegrityError"""
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    def __init__(self, session, **kwargs):
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        self.session = session
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        assert 'rtypes' in kwargs or 'cstrname' in kwargs
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        self.kwargs = kwargs
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        # fill cache while the session is open
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        self.rtypes
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    @cachedproperty
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    def rtypes(self):
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        if 'rtypes' in self.kwargs:
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            return self.kwargs['rtypes']
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        cstrname = unicode(self.kwargs['cstrname'])
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        cstr = self.session.find('CWUniqueTogetherConstraint', name=cstrname).one()
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        return sorted(rtype.name for rtype in cstr.relations)
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    @cachedproperty
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    def args(self):
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        warn('[3.18] UniqueTogetherError.args is deprecated, just use '
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             'the .rtypes accessor.',
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             DeprecationWarning)
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        # the first argument, etype, is never used and was never garanteed anyway
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        return None, self.rtypes
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class ViolatedConstraint(RepositoryError):
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    def __init__(self, cnx, cstrname):
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        self.cnx = cnx
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        self.cstrname = cstrname
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# security exceptions #########################################################
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class Unauthorized(SecurityError):
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    """raised when a user tries to perform an action without sufficient
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    credentials
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    """
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    msg = 'You are not allowed to perform this operation'
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    msg1 = 'You are not allowed to perform %s operation on %s'
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    var = None
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    def __str__(self):
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        try:
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            if self.args and len(self.args) == 2:
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                return self.msg1 % self.args
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            if self.args:
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                return ' '.join(self.args)
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            return self.msg
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        except Exception as ex:
0
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            return str(ex)
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class Forbidden(SecurityError):
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    """raised when a user tries to perform a forbidden action
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    """
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# source exceptions ###########################################################
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class EidNotInSource(SourceException):
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    """trying to access an object with a particular eid from a particular
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    source has failed
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    """
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    msg = 'No entity with eid %s in %s'
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# registry exceptions #########################################################
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# pre 3.15 bw compat
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from logilab.common.registry import RegistryException, ObjectNotFound, NoSelectableObject
0
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class UnknownProperty(RegistryException):
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    """property found in database but unknown in registry"""
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# query exception #############################################################
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class QueryError(CubicWebRuntimeError):
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    """a query try to do something it shouldn't"""
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class NotAnEntity(CubicWebRuntimeError):
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    """raised when get_entity is called for a column which doesn't contain
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    a non final entity
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    """
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class MultipleResultsError(CubicWebRuntimeError):
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    """raised when ResultSet.one() is called on a resultset with multiple rows
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    of multiple columns.
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    """
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class NoResultError(CubicWebRuntimeError):
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    """raised when no result is found but at least one is expected.
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    """
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class UndoTransactionException(QueryError):
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    """Raised when undoing a transaction could not be performed completely.
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    Note that :
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      1) the partial undo operation might be acceptable
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         depending upon the final application
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      2) the undo operation can also fail with a `ValidationError` in
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         cases where the undoing breaks integrity constraints checked
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         immediately.
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      3) It might be that neither of those exception is raised but a
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         subsequent `commit` might raise a `ValidationError` in cases
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         where the undoing breaks integrity constraints checked at
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         commit time.
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    :type txuuix: int
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    :param txuuid: Unique identifier of the partially undone transaction
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    :type errors: list
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    :param errors: List of errors occurred during undoing
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    """
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    msg = u"The following error(s) occurred while undoing transaction #%d : %s"
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    def __init__(self, txuuid, errors):
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        super(UndoTransactionException, self).__init__(txuuid, errors)
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        self.txuuid = txuuid
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        self.errors = errors
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0
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# tools exceptions ############################################################
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class ExecutionError(Exception):
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    """server execution control error (already started, not running...)"""
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# pylint: disable=W0611
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from logilab.common.clcommands import BadCommandUsage