appobject.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 20 Mar 2012 11:01:24 +0100
branchstable
changeset 8337 b5275e739a44
parent 7990 a673d1d9a738
child 8190 2a3c1b787688
permissions -rw-r--r--
[form] add a new property telling if the form is being generated or posted. Closes #2262340
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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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"""
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.. _appobject:
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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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.. autoclass:: AppObject
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"""
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__docformat__ = "restructuredtext en"
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import types
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from logging import getLogger
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from warnings import warn
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from logilab.common.deprecation import deprecated
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from logilab.common.decorators import classproperty
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from logilab.common.logging_ext import set_log_methods
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from cubicweb.cwconfig import CubicWebConfiguration
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def class_regid(cls):
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    """returns a unique identifier for an appobject class"""
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    return cls.__regid__
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# helpers for debugging selectors
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TRACED_OIDS = None
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def _trace_selector(cls, selector, args, ret):
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    # /!\ lltrace decorates pure function or __call__ method, this
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    #     means argument order may be different
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    if isinstance(cls, Selector):
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        selname = str(cls)
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        vobj = args[0]
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    else:
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        selname = selector.__name__
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        vobj = cls
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    if TRACED_OIDS == 'all' or class_regid(vobj) in TRACED_OIDS:
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        #SELECTOR_LOGGER.warning('selector %s returned %s for %s', selname, ret, cls)
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        print '%s -> %s for %s(%s)' % (selname, ret, vobj, vobj.__regid__)
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def lltrace(selector):
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    """use this decorator on your selectors so the becomes traceable with
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    :class:`traced_selection`
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    """
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    # don't wrap selectors if not in development mode
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    if CubicWebConfiguration.mode == 'system': # XXX config.debug
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        return selector
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    def traced(cls, *args, **kwargs):
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        ret = selector(cls, *args, **kwargs)
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        if TRACED_OIDS is not None:
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            _trace_selector(cls, selector, args, ret)
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        return ret
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    traced.__name__ = selector.__name__
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    traced.__doc__ = selector.__doc__
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    return traced
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class traced_selection(object):
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    """
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    Typical usage is :
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    .. sourcecode:: python
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        >>> from cubicweb.selectors import traced_selection
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        >>> with traced_selection():
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        ...     # some code in which you want to debug selectors
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        ...     # for all objects
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    Don't forget the 'from __future__ import with_statement' at the module top-level
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    if you're using python prior to 2.6.
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    93
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    94
    This will yield lines like this in the logs::
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    95
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    96
        selector one_line_rset returned 0 for <class 'cubicweb.web.views.basecomponents.WFHistoryVComponent'>
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    97
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    98
    You can also give to :class:`traced_selection` the identifiers of objects on
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    99
    which you want to debug selection ('oid1' and 'oid2' in the example above).
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   100
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   101
    .. sourcecode:: python
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   102
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   103
        >>> with traced_selection( ('regid1', 'regid2') ):
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        ...     # some code in which you want to debug selectors
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   105
        ...     # for objects with __regid__ 'regid1' and 'regid2'
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   106
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   107
    A potentially usefull point to set up such a tracing function is
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   108
    the `cubicweb.vregistry.Registry.select` method body.
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   109
    """
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   110
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   111
    def __init__(self, traced='all'):
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        self.traced = traced
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   113
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   114
    def __enter__(self):
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   115
        global TRACED_OIDS
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        TRACED_OIDS = self.traced
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   117
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   118
    def __exit__(self, exctype, exc, traceback):
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   119
        global TRACED_OIDS
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        TRACED_OIDS = None
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   121
        return traceback is None
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# selector base classes and operations ########################################
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def objectify_selector(selector_func):
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    """Most of the time, a simple score function is enough to build a selector.
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    The :func:`objectify_selector` decorator turn it into a proper selector
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    class::
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        @objectify_selector
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        def one(cls, req, rset=None, **kwargs):
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            return 1
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        class MyView(View):
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            __select__ = View.__select__ & one()
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   137
    """
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    return type(selector_func.__name__, (Selector,),
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                {'__doc__': selector_func.__doc__,
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                 '__call__': lambda self, *a, **kw: selector_func(*a, **kw)})
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   143
def _instantiate_selector(selector):
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    """ensures `selector` is a `Selector` instance
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   145
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   146
    NOTE: This should only be used locally in build___select__()
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    XXX: then, why not do it ??
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   148
    """
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    if isinstance(selector, types.FunctionType):
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        return objectify_selector(selector)()
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    if isinstance(selector, type) and issubclass(selector, Selector):
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   152
        return selector()
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    return selector
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   156
class Selector(object):
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    """base class for selector classes providing implementation
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    for operators ``&``, ``|`` and  ``~``
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    This class is only here to give access to binary operators, the
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    selector logic itself should be implemented in the __call__ method
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   164
    a selector is called to help choosing the correct object for a
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   165
    particular context by returning a score (`int`) telling how well
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    the class given as first argument apply to the given context.
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   167
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    0 score means that the class doesn't apply.
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   169
    """
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   170
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    @property
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    def func_name(self):
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   173
        # backward compatibility
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   174
        return self.__class__.__name__
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    def search_selector(self, selector):
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        """search for the given selector, selector instance or tuple of
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        selectors in the selectors tree. Return None if not found.
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        """
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        if self is selector:
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            return self
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        if (isinstance(selector, type) or isinstance(selector, tuple)) and \
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               isinstance(self, selector):
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            return self
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        return None
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    def __str__(self):
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        return self.__class__.__name__
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    def __and__(self, other):
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        return AndSelector(self, other)
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    def __rand__(self, other):
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        return AndSelector(other, self)
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    def __iand__(self, other):
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        return AndSelector(self, other)
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    def __or__(self, other):
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        return OrSelector(self, other)
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    def __ror__(self, other):
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        return OrSelector(other, self)
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    def __ior__(self, other):
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        return OrSelector(self, other)
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    def __invert__(self):
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        return NotSelector(self)
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    # XXX (function | function) or (function & function) not managed yet
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    def __call__(self, cls, *args, **kwargs):
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        return NotImplementedError("selector %s must implement its logic "
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                                   "in its __call__ method" % self.__class__)
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    def __repr__(self):
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        return u'<Selector %s at %x>' % (self.__class__.__name__, id(self))
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class MultiSelector(Selector):
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    """base class for compound selector classes"""
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    def __init__(self, *selectors):
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        self.selectors = self.merge_selectors(selectors)
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    def __str__(self):
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        return '%s(%s)' % (self.__class__.__name__,
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                           ','.join(str(s) for s in self.selectors))
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    @classmethod
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    def merge_selectors(cls, selectors):
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        """deal with selector instanciation when necessary and merge
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        multi-selectors if possible:
0
b97547f5f1fa Showtime !
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        AndSelector(AndSelector(sel1, sel2), AndSelector(sel3, sel4))
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        ==> AndSelector(sel1, sel2, sel3, sel4)
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        """
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        merged_selectors = []
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        for selector in selectors:
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            try:
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                selector = _instantiate_selector(selector)
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            except Exception:
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                pass
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            #assert isinstance(selector, Selector), selector
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            if isinstance(selector, cls):
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                merged_selectors += selector.selectors
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            else:
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                merged_selectors.append(selector)
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        return merged_selectors
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    def search_selector(self, selector):
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        """search for the given selector or selector instance (or tuple of
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        selectors) in the selectors tree. Return None if not found
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        """
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        for childselector in self.selectors:
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            if childselector is selector:
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                return childselector
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            found = childselector.search_selector(selector)
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            if found is not None:
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                return found
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        # if not found in children, maybe we are looking for self?
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        return super(MultiSelector, self).search_selector(selector)
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class AndSelector(MultiSelector):
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    """and-chained selectors (formerly known as chainall)"""
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    @lltrace
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    def __call__(self, cls, *args, **kwargs):
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   265
        score = 0
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        for selector in self.selectors:
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            partscore = selector(cls, *args, **kwargs)
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            if not partscore:
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   269
                return 0
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            score += partscore
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        return score
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   272
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class OrSelector(MultiSelector):
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    """or-chained selectors (formerly known as chainfirst)"""
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    @lltrace
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    def __call__(self, cls, *args, **kwargs):
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        for selector in self.selectors:
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            partscore = selector(cls, *args, **kwargs)
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            if partscore:
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   281
                return partscore
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   282
        return 0
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class NotSelector(Selector):
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    """negation selector"""
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    def __init__(self, selector):
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        self.selector = selector
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   288
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   289
    @lltrace
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    def __call__(self, cls, *args, **kwargs):
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        score = self.selector(cls, *args, **kwargs)
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   292
        return int(not score)
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   293
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    def __str__(self):
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   295
        return 'NOT(%s)' % self.selector
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class yes(Selector):
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    """Return the score given as parameter, with a default score of 0.5 so any
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   300
    other selector take precedence.
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   301
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   302
    Usually used for appobjects which can be selected whatever the context, or
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   303
    also sometimes to add arbitrary points to a score.
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    Take care, `yes(0)` could be named 'no'...
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    """
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    def __init__(self, score=0.5):
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        self.score = score
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   309
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    def __call__(self, *args, **kwargs):
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   311
        return self.score
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# the base class for all appobjects ############################################
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   315
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   316
class AppObject(object):
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    """This is the base class for CubicWeb application objects which are
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    selected according to a context (usually at least a request and a result
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   319
    set).
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    The following attributes should be set on concrete appobject classes:
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   322
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   323
    :attr:`__registry__`
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      name of the registry for this object (string like 'views',
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   325
      'templates'...)
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   326
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   327
    :attr:`__regid__`
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   328
      object's identifier in the registry (string like 'main',
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   329
      'primary', 'folder_box')
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   330
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   331
    :attr:`__select__`
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   332
      class'selector
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   333
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   334
    Moreover, the `__abstract__` attribute may be set to True to indicate that a
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   335
    class is abstract and should not be registered.
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   336
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   337
    At selection time, the following attributes are set on the instance:
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   338
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   339
    :attr:`_cw`
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   340
      current request
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   341
    :attr:`cw_extra_kwargs`
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   342
      other received arguments
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   344
    And also the following, only if `rset` is found in arguments (in which case
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   345
    rset/row/col will be removed from `cwextra_kwargs`):
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   346
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   347
    :attr:`cw_rset`
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   348
      context result set or None
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   349
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   350
    :attr:`cw_row`
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   351
      if a result set is set and the context is about a particular cell in the
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   352
      result set, and not the result set as a whole, specify the row number we
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   353
      are interested in, else None
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   354
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   355
    :attr:`cw_col`
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   356
      if a result set is set and the context is about a particular cell in the
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   357
      result set, and not the result set as a whole, specify the col number we
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   358
      are interested in, else None
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   359
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   360
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   361
    .. Note::
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   362
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   363
      * do not inherit directly from this class but from a more specific class
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   364
        such as `AnyEntity`, `EntityView`, `AnyRsetView`, `Action`...
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   365
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   366
      * to be recordable, a subclass has to define its registry (attribute
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   367
        `__registry__`) and its identifier (attribute `__regid__`). Usually
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   368
        you don't have to take care of the registry since it's set by the base
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   369
        class, only the identifier `id`
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   370
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   371
      * application objects are designed to be loaded by the vregistry and
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   372
        should be accessed through it, not by direct instantiation, besides
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   373
        to use it as base classe.
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   374
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   375
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   376
      * When we inherit from `AppObject` (even not directly), you *always* have
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   377
        to use **super()** to get the methods and attributes of the superclasses,
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   378
        and not use the class identifier.
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   379
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   380
        For example, instead of writting::
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   381
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   382
          class Truc(PrimaryView):
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   383
              def f(self, arg1):
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   384
                  PrimaryView.f(self, arg1)
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   385
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diff changeset
   386
        You must write::
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   387
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   388
          class Truc(PrimaryView):
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   389
              def f(self, arg1):
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diff changeset
   390
                  super(Truc, self).f(arg1)
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   391
0
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   392
    """
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diff changeset
   393
    __registry__ = None
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diff changeset
   394
    __regid__ = None
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diff changeset
   395
    __select__ = yes()
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diff changeset
   396
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diff changeset
   397
    @classproperty
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diff changeset
   398
    def __registries__(cls):
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diff changeset
   399
        if cls.__registry__ is None:
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diff changeset
   400
            return ()
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diff changeset
   401
        return (cls.__registry__,)
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diff changeset
   402
0
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   403
    @classmethod
2820
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diff changeset
   404
    def __registered__(cls, registry):
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diff changeset
   405
        """called by the registry when the appobject has been registered.
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diff changeset
   406
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diff changeset
   407
        It must return the object that will be actually registered (this may be
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diff changeset
   408
        the right hook to create an instance for example). By default the
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diff changeset
   409
        appobject is returned without any transformation.
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diff changeset
   410
        """
7990
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 7879
diff changeset
   411
        pdefs = getattr(cls, 'cw_property_defs', {})
2802
2251b4aee54a should still call .items
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2799
diff changeset
   412
        for propid, pdef in pdefs.items():
2799
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diff changeset
   413
            pdef = pdef.copy() # may be shared
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diff changeset
   414
            pdef['default'] = getattr(cls, propid, pdef['default'])
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Sylvain Thénault <sylvain.thenault@logilab.fr>
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diff changeset
   415
            pdef['sitewide'] = getattr(cls, 'site_wide', pdef.get('sitewide'))
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
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diff changeset
   416
            registry.vreg.register_property(cls._cwpropkey(propid), **pdef)
4716
55b6a3262071 fix some pylint detected errors
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4568
diff changeset
   417
        assert callable(cls.__select__), cls
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
        return cls
1524
1d7575f5deaf delete-trailing-whitespaces
sylvain.thenault@logilab.fr
parents: 1398
diff changeset
   419
2822
f26578339214 deprecate appobject.vreg and rename appobject instance attributes using cw_ prefix
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2821
diff changeset
   420
    def __init__(self, req, **extra):
2656
a93ae0f6c0ad R [base classes] only AppObject remaning, no more AppRsetObject
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2650
diff changeset
   421
        super(AppObject, self).__init__()
2847
c2ee28f4d4b1 use ._cw instead of .cw_req
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2833
diff changeset
   422
        self._cw = req
2822
f26578339214 deprecate appobject.vreg and rename appobject instance attributes using cw_ prefix
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2821
diff changeset
   423
        try:
f26578339214 deprecate appobject.vreg and rename appobject instance attributes using cw_ prefix
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2821
diff changeset
   424
            self.cw_rset = extra.pop('rset')
f26578339214 deprecate appobject.vreg and rename appobject instance attributes using cw_ prefix
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2821
diff changeset
   425
            self.cw_row = extra.pop('row', None)
f26578339214 deprecate appobject.vreg and rename appobject instance attributes using cw_ prefix
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2821
diff changeset
   426
            self.cw_col = extra.pop('col', None)
f26578339214 deprecate appobject.vreg and rename appobject instance attributes using cw_ prefix
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2821
diff changeset
   427
        except KeyError:
f26578339214 deprecate appobject.vreg and rename appobject instance attributes using cw_ prefix
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2821
diff changeset
   428
            pass
f26578339214 deprecate appobject.vreg and rename appobject instance attributes using cw_ prefix
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2821
diff changeset
   429
        self.cw_extra_kwargs = extra
1524
1d7575f5deaf delete-trailing-whitespaces
sylvain.thenault@logilab.fr
parents: 1398
diff changeset
   430
2799
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   431
    # persistent class properties ##############################################
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   432
    #
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   433
    # optional `cw_property_defs` dict on a class defines available persistent
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   434
    # properties for this class:
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   435
    #
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   436
    # * key: id of the property (the actual CWProperty key is build using
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   437
    #        <registry name>.<obj id>.<property id>
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   438
    # * value: tuple (property type, vocabfunc, default value, property description)
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   439
    #         possible types are those used by `logilab.common.configuration`
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   440
    #
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   441
    # notice that when it exists multiple objects with the same id (adaptation,
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   442
    # overriding) only the first encountered definition is considered, so those
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   443
    # objects can't try to have different default values for instance.
2799
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   444
    #
2818
326375561412 propagate some api changes
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2811
diff changeset
   445
    # you can then access to a property value using self.cw_propval, where self
326375561412 propagate some api changes
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2811
diff changeset
   446
    # is an instance of class
1524
1d7575f5deaf delete-trailing-whitespaces
sylvain.thenault@logilab.fr
parents: 1398
diff changeset
   447
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   448
    @classmethod
2799
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   449
    def _cwpropkey(cls, propid):
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   450
        """return cw property key for the property of the given id for this
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   451
        class
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   452
        """
3399
2b84f4adb6f8 use __regid__ instead of id on appobject classes
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3396
diff changeset
   453
        return '%s.%s.%s' % (cls.__registry__, cls.__regid__, propid)
1524
1d7575f5deaf delete-trailing-whitespaces
sylvain.thenault@logilab.fr
parents: 1398
diff changeset
   454
2799
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   455
    def cw_propval(self, propid):
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   456
        """return cw property value associated to key
1524
1d7575f5deaf delete-trailing-whitespaces
sylvain.thenault@logilab.fr
parents: 1398
diff changeset
   457
2799
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   458
        <cls.__registry__>.<cls.id>.<propid>
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   459
        """
3418
7b49fa7e942d [api] use _cw, cw_row, cw_col, cw_rset etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3399
diff changeset
   460
        return self._cw.property_value(self._cwpropkey(propid))
2799
b703639614e7 refactor property handling to avoid name conflicts
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2798
diff changeset
   461
7083
b8e35cde46e9 help pylint by explicitely defining some attributes
Alexandre Fayolle <alexandre.fayolle@logilab.fr>
parents: 6870
diff changeset
   462
    # these are overridden by set_log_methods below
b8e35cde46e9 help pylint by explicitely defining some attributes
Alexandre Fayolle <alexandre.fayolle@logilab.fr>
parents: 6870
diff changeset
   463
    # only defining here to prevent pylint from complaining
b8e35cde46e9 help pylint by explicitely defining some attributes
Alexandre Fayolle <alexandre.fayolle@logilab.fr>
parents: 6870
diff changeset
   464
    info = warning = error = critical = exception = debug = lambda msg,*a,**kw: None
b8e35cde46e9 help pylint by explicitely defining some attributes
Alexandre Fayolle <alexandre.fayolle@logilab.fr>
parents: 6870
diff changeset
   465
2657
de974465d381 [appobject] kill VObject class, move base selector classes to appobject
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2656
diff changeset
   466
set_log_methods(AppObject, getLogger('cubicweb.appobject'))