appobject.py
author Rémi Cardona <remi.cardona@logilab.fr>
Fri, 18 Sep 2015 11:54:12 +0200
changeset 10706 b261d90149d0
parent 10496 e95b559a06a2
permissions -rw-r--r--
[server] Port BFSS to py3k The BFSS API changes in python 3: * 'defaultdir' MUST be a unicode object * 'fsencoding' MUST NOT be set In python 2, fsencoding handles both the encoding of file paths on the file system (utf-8 by default, but the system may actually be using something else) and the encoding of file paths that will be stored in the database. So in python 3, we wipe the slate clean: * rely on sys.getfilesystemencoding() to convert unicode objects to bytes * always encode paths to utf-8 for storage in the database Caveat emptor / here be dragons: * sys.getfilesystemencoding() depends on the current locale, which therefore MUST be set properly * when migrating an existing instance from py2 to py3, one MAY need to reencode file paths stored in the database
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# copyright 2003-2012 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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"""
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The `AppObject` class
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---------------------
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The AppObject class is the base class for all dynamically loaded objects
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(application objects) accessible through the vregistry.
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We can find a certain number of attributes and methods defined in this class and
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common to all the application objects.
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"""
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__docformat__ = "restructuredtext en"
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from logging import getLogger
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from logilab.common.deprecation import deprecated, class_renamed
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from logilab.common.logging_ext import set_log_methods
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# first line imports for bw compat
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from logilab.common.registry import (objectify_predicate, traced_selection, Predicate,
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                                     RegistrableObject, yes)
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objectify_selector = deprecated('[3.15] objectify_selector has been '
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                                'renamed to objectify_predicates in '
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                                'logilab.common.registry')(objectify_predicate)
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traced_selection = deprecated('[3.15] traced_selection has been '
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                              'moved to logilab.common.registry')(traced_selection)
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Selector = class_renamed('Selector', Predicate,
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                         '[3.15] Selector has been renamed to Predicate '
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                         'in logilab.common.registry')
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@deprecated('[3.15] lltrace decorator can now be removed')
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def lltrace(func):
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    return func
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# the base class for all appobjects ############################################
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class AppObject(RegistrableObject):
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    """This is the base class for CubicWeb application objects which are
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    selected in a request context.
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    The following attributes should be set on concrete appobject classes:
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    At selection time, the following attributes are set on the instance:
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    :attr:`_cw`
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      current request
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    :attr:`cw_extra_kwargs`
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      other received arguments
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    And also the following, only if `rset` is found in arguments (in which case
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    rset/row/col will be removed from `cwextra_kwargs`):
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    :attr:`cw_rset`
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      context result set or None
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    :attr:`cw_row`
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      if a result set is set and the context is about a particular cell in the
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      result set, and not the result set as a whole, specify the row number we
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      are interested in, else None
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    :attr:`cw_col`
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      if a result set is set and the context is about a particular cell in the
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      result set, and not the result set as a whole, specify the col number we
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      are interested in, else None
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    .. Note::
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      * do not inherit directly from this class but from a more specific class
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        such as `AnyEntity`, `EntityView`, `AnyRsetView`, `Action`...
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    """
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    __select__ = yes()
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    @classmethod
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    def __registered__(cls, registry):
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        """called by the registry when the appobject has been registered.
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        It must return the object that will be actually registered (this may be
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        the right hook to create an instance for example). By default the
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        appobject is returned without any transformation.
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        """
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        pdefs = getattr(cls, 'cw_property_defs', {})
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        for propid, pdef in pdefs.items():
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            pdef = pdef.copy() # may be shared
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            pdef['default'] = getattr(cls, propid, pdef['default'])
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            pdef['sitewide'] = getattr(cls, 'site_wide', pdef.get('sitewide'))
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            registry.vreg.register_property(cls._cwpropkey(propid), **pdef)
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        assert callable(cls.__select__), cls
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        return cls
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    def __init__(self, req, **extra):
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        super(AppObject, self).__init__()
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        self._cw = req
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        try:
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            self.cw_rset = extra.pop('rset')
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            self.cw_row = extra.pop('row', None)
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            self.cw_col = extra.pop('col', None)
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        except KeyError:
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            pass
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        self.cw_extra_kwargs = extra
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    # persistent class properties ##############################################
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    #
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    # optional `cw_property_defs` dict on a class defines available persistent
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    # properties for this class:
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    #
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    # * key: id of the property (the actual CWProperty key is build using
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    #        <registry name>.<obj id>.<property id>
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    # * value: tuple (property type, vocabfunc, default value, property description)
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    #         possible types are those used by `logilab.common.configuration`
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    #
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    # notice that when it exists multiple objects with the same id (adaptation,
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    # overriding) only the first encountered definition is considered, so those
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    # objects can't try to have different default values for instance.
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    #
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    # you can then access to a property value using self.cw_propval, where self
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    # is an instance of class
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    @classmethod
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    def _cwpropkey(cls, propid):
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        """return cw property key for the property of the given id for this
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        class
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        """
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        return '%s.%s.%s' % (cls.__registry__, cls.__regid__, propid)
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    def cw_propval(self, propid):
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        """return cw property value associated to key
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        <cls.__registry__>.<cls.id>.<propid>
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        """
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        return self._cw.property_value(self._cwpropkey(propid))
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   153
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    # these are overridden by set_log_methods below
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    # only defining here to prevent pylint from complaining
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    info = warning = error = critical = exception = debug = lambda msg,*a,**kw: None
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set_log_methods(AppObject, getLogger('cubicweb.appobject'))
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# defined here to avoid warning on usage on the AppObject class
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yes = deprecated('[3.15] yes has been moved to logilab.common.registry')(yes)