appobject.py
author sylvain.thenault@logilab.fr
Wed, 11 Mar 2009 14:37:22 +0100
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"""Base class for dynamically loaded objects manipulated in the web interface
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:organization: Logilab
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:copyright: 2001-2009 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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__docformat__ = "restructuredtext en"
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from warnings import warn
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from datetime import datetime, timedelta
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from simplejson import dumps
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from logilab.common.decorators import classproperty
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from logilab.common.deprecation import obsolete
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from rql.nodes import VariableRef, SubQuery
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from rql.stmts import Union, Select
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from cubicweb import Unauthorized
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from cubicweb.vregistry import VObject, AndSelector
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from cubicweb.selectors import yes
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from cubicweb.utils import UStringIO, ustrftime
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ONESECOND = timedelta(0, 1, 0)
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class Cache(dict):    
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    def __init__(self):
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        super(Cache, self).__init__()
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        self.cache_creation_date = None
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        self.latest_cache_lookup = datetime.now()
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CACHE_REGISTRY = {}
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class AppRsetObject(VObject):
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    """This is the base class for CubicWeb application objects
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    which are selected according to a request and result set.
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    Classes are kept in the vregistry and instantiation is done at selection
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    time.
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    At registration time, the following attributes are set on the class:
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    :vreg:
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      the application's registry
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    :schema:
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      the application's schema
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    :config:
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      the application's configuration
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    At instantiation time, the following attributes are set on the instance:
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    :req:
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      current request
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    :rset:
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      result set on which the object is applied
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    """
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    __select__ = yes()
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    @classmethod
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    def registered(cls, vreg):
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        super(AppRsetObject, cls).registered(vreg)
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        cls.vreg = vreg
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        cls.schema = vreg.schema
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        cls.config = vreg.config
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        cls.register_properties()
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        return cls
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    @classmethod
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    def selected(cls, *args, **kwargs):
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        """by default web app objects are usually instantiated on
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        selection according to a request, a result set, and optional
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        row and col
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        """
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        assert len(args) <= 2
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#         for key in ('req', 'rset'):
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#             if key in kwargs:
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#                 args += (kwargs.pop(key),)
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        instance = cls(*args)
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        instance.row = kwargs.pop('row', None)
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        instance.col = kwargs.pop('col', None)
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        instance.extra_kwargs = kwargs
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        return instance
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    # Eproperties definition:
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    # key: id of the property (the actual EProperty 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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    property_defs = {}
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    @classmethod
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    def register_properties(cls):
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        for propid, pdef in cls.property_defs.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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            cls.vreg.register_property(cls.propkey(propid), **pdef)
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    @classmethod
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    def propkey(cls, propid):
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        return '%s.%s.%s' % (cls.__registry__, cls.id, propid)
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    @classproperty
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    @obsolete('use __select__ and & or | operators')
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    def __selectors__(cls):
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        selector = cls.__select__
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        if isinstance(selector, AndSelector):
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            return tuple(selector.selectors)
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        if not isinstance(selector, tuple):
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            selector = (selector,)
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        return selector
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    def __init__(self, req=None, rset=None):
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        super(AppRsetObject, self).__init__()
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        self.req = req
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        self.rset = rset
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    @property
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    def cursor(self): # XXX deprecate in favor of req.cursor?
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        msg = '.cursor is deprecated, use req.execute (or req.cursor if necessary)'
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        warn(msg, DeprecationWarning, stacklevel=2)
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        return self.req.cursor
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    def get_cache(self, cachename):
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        """
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        NOTE: cachename should be dotted names as in :
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        - cubicweb.mycache
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        - cubes.blog.mycache 
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        - etc.
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        """
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        if cachename in CACHE_REGISTRY:
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            cache = CACHE_REGISTRY[cachename]
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        else:
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            cache = Cache()
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            CACHE_REGISTRY[cachename] = cache
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        _now = datetime.now()
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        if _now > cache.latest_cache_lookup + ONESECOND:
0
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            ecache = self.req.execute('Any C,T WHERE C is ECache, C name %(name)s, C timestamp T', 
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                                      {'name':cachename}).get_entity(0,0)
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            cache.latest_cache_lookup = _now
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            if not ecache.valid(cache.cache_creation_date):
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                cache.empty()
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                cache.cache_creation_date = _now
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        return cache
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    def propval(self, propid):
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        assert self.req
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        return self.req.property_value(self.propkey(propid))
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    def limited_rql(self):
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        """return a printable rql for the result set associated to the object,
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        with limit/offset correctly set according to maximum page size and
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        currently displayed page when necessary
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        """
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        # try to get page boundaries from the navigation component
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        # XXX we should probably not have a ref to this component here (eg in
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        #     cubicweb.common)
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        nav = self.vreg.select_component('navigation', self.req, self.rset)
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        if nav:
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            start, stop = nav.page_boundaries()
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            rql = self._limit_offset_rql(stop - start, start)
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        # result set may have be limited manually in which case navigation won't
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        # apply
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        elif self.rset.limited:
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            rql = self._limit_offset_rql(*self.rset.limited)
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        # navigation component doesn't apply and rset has not been limited, no
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        # need to limit query
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        else:
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            rql = self.rset.printable_rql()
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        return rql
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    def _limit_offset_rql(self, limit, offset):
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        rqlst = self.rset.syntax_tree()
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        if len(rqlst.children) == 1:
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            select = rqlst.children[0]
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            olimit, ooffset = select.limit, select.offset
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            select.limit, select.offset = limit, offset
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            rql = rqlst.as_string(kwargs=self.rset.args)
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            # restore original limit/offset
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            select.limit, select.offset = olimit, ooffset
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        else:
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            newselect = Select()
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            newselect.limit = limit
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            newselect.offset = offset
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            aliases = [VariableRef(newselect.get_variable(vref.name, i))
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                       for i, vref in enumerate(rqlst.selection)]
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            newselect.set_with([SubQuery(aliases, rqlst)], check=False)
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            newunion = Union()
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            newunion.append(newselect)
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            rql = rqlst.as_string(kwargs=self.rset.args)
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            rqlst.parent = None
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        return rql
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    # url generation methods ##################################################
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    controller = 'view'
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    def build_url(self, method=None, **kwargs):
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        """return an absolute URL using params dictionary key/values as URL
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        parameters. Values are automatically URL quoted, and the
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        publishing method to use may be specified or will be guessed.
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        """
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   208
        # XXX I (adim) think that if method is passed explicitly, we should
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   209
        #     not try to process it and directly call req.build_url()
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        if method is None:
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            method = self.controller
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            if method == 'view' and self.req.from_controller() == 'view' and \
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                   not '_restpath' in kwargs:
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                method = self.req.relative_path(includeparams=False) or 'view'
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        return self.req.build_url(method, **kwargs)
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    # various resources accessors #############################################
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    def etype_rset(self, etype, size=1):
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        """return a fake result set for a particular entity type"""
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        msg = '.etype_rset is deprecated, use req.etype_rset'
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        warn(msg, DeprecationWarning, stacklevel=2)
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        return self.req.etype_rset(etype, size=1)
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    def eid_rset(self, eid, etype=None):
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        """return a result set for the given eid"""
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   227
        msg = '.eid_rset is deprecated, use req.eid_rset'
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        warn(msg, DeprecationWarning, stacklevel=2)
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   229
        return self.req.eid_rset(eid, etype)
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   230
    
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    def entity(self, row, col=0):
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        """short cut to get an entity instance for a particular row/column
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        (col default to 0)
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   234
        """
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        return self.rset.get_entity(row, col)
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   236
    
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    def complete_entity(self, row, col=0, skip_bytes=True):
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        """short cut to get an completed entity instance for a particular
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        row (all instance's attributes have been fetched)
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   240
        """
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        entity = self.entity(row, col)
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        entity.complete(skip_bytes=skip_bytes)
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   243
        return entity
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    def user_rql_callback(self, args, msg=None):
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   246
        """register a user callback to execute some rql query and return an url
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   247
        to call it ready to be inserted in html
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        """
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   249
        def rqlexec(req, rql, args=None, key=None):
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   250
            req.execute(rql, args, key)
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        return self.user_callback(rqlexec, args, msg)
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   252
        
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    def user_callback(self, cb, args, msg=None, nonify=False):
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   254
        """register the given user callback and return an url to call it ready to be
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   255
        inserted in html
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   256
        """
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   257
        self.req.add_js('cubicweb.ajax.js')
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   258
        if nonify:
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   259
            # XXX < 2.48.3 bw compat
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   260
            warn('nonify argument is deprecated', DeprecationWarning, stacklevel=2)
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            _cb = cb
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            def cb(*args):
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   263
                _cb(*args)
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   264
        cbname = self.req.register_onetime_callback(cb, *args)
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        msg = dumps(msg or '') 
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        return "javascript:userCallbackThenReloadPage('%s', %s)" % (
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            cbname, msg)
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    # formating methods #######################################################
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    def tal_render(self, template, variables):
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        """render a precompiled page template with variables in the given
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        dictionary as context
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        """
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        from cubicweb.common.tal import CubicWebContext
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        context = CubicWebContext()
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        context.update({'self': self, 'rset': self.rset, '_' : self.req._,
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                        'req': self.req, 'user': self.req.user})
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        context.update(variables)
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        output = UStringIO()
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        template.expand(context, output)
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        return output.getvalue()
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    def format_date(self, date, date_format=None, time=False):
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        """return a string for a date time according to application's
0
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        configuration
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        """
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        if date:
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            if date_format is None:
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                if time:
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                    date_format = self.req.property_value('ui.datetime-format')
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                else:
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                    date_format = self.req.property_value('ui.date-format')
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            return ustrftime(date, date_format)
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        return u''
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    def format_time(self, time):
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        """return a string for a time according to application's
0
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        configuration
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        """
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        if time:
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            return ustrftime(time, self.req.property_value('ui.time-format'))
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        return u''
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    def format_float(self, num):
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        """return a string for floating point number according to application's
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        configuration
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        """
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        if num:
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            return self.req.property_value('ui.float-format') % num
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        return u''
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    # security related methods ################################################
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    def ensure_ro_rql(self, rql):
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        """raise an exception if the given rql is not a select query"""
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        first = rql.split(' ', 1)[0].lower()
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        if first in ('insert', 'set', 'delete'):
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            raise Unauthorized(self.req._('only select queries are authorized'))
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class AppObject(AppRsetObject):
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    """base class for application objects which are not selected
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    according to a result set, only by their identifier.
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    Those objects may not have req, rset and cursor set.
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    """
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    @classmethod
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    def selected(cls, *args, **kwargs):
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        """by default web app objects are usually instantiated on
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        selection
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        """
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        return cls(*args, **kwargs)
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    def __init__(self, req=None, rset=None, **kwargs):
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        self.req = req
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        self.rset = rset
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        self.__dict__.update(kwargs)