[entity] introduce a new 'adapters' registry
This changeset introduces the notion in adapters (as in Zope Component Architecture)
in a cubicweb way, eg using a specific registry of appobjects.
This allows nicer code structure, by avoid clutering entity classes and moving
code usually specific to a place of the ui (or something else) together with the
code that use the interface.
We don't use actual interface anymore, they are implied by adapters (which
may be abstract), whose reg id is an interface name.
Appobjects that used to 'implements(IFace)' should now be rewritten by:
* coding an IFaceAdapter(EntityAdapter) defining (implementing if desired)
the interface, usually with __regid__ = 'IFace'
* use "adaptable('IFace')" as selector instead
Also, the implements_adapter_compat decorator eases backward compatibility
with adapter's methods that may still be found on entities implementing
the interface.
Notice that unlike ZCA, we don't support automatic adapters chain (yagni?).
All interfaces defined in cubicweb have been turned into adapters, also
some new ones have been introduced to cleanup Entity / AnyEntity classes
namespace. At the end, the pluggable mixins mecanism should disappear in
favor of adapters as well.
# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""abstract controller classe for CubicWeb web client
"""
__docformat__ = "restructuredtext en"
from logilab.mtconverter import xml_escape
from cubicweb.selectors import yes
from cubicweb.appobject import AppObject
from cubicweb.web import LOGGER, Redirect, RequestError
NAVIGATION_PARAMETERS = (('vid', '__redirectvid'),
('rql', '__redirectrql'),
('__redirectpath', '__redirectpath'),
('__redirectparams', '__redirectparams'),
)
NAV_FORM_PARAMETERS = tuple(fp for ap, fp in NAVIGATION_PARAMETERS)
def redirect_params(form):
"""transform redirection parameters into navigation parameters
"""
params = {}
# extract navigation parameters from redirection parameters
for navparam, redirectparam in NAVIGATION_PARAMETERS:
if navparam == redirectparam:
continue
if redirectparam in form:
params[navparam] = form[redirectparam]
return params
def append_url_params(url, params):
"""append raw parameters to the url. Given parameters, if any, are expected
to be already url-quoted.
"""
if params:
if not '?' in url:
url += '?'
else:
url += '&'
url += params
return url
class Controller(AppObject):
"""a controller is responsible to make necessary stuff to publish
a request. There is usually at least one standard "view" controller
and another linked by forms to edit objects ("edit").
"""
__registry__ = 'controllers'
__select__ = yes()
def __init__(self, *args, **kwargs):
self.appli = kwargs.pop('appli', None)
super(Controller, self).__init__(*args, **kwargs)
# attributes use to control after edition redirection
self._after_deletion_path = None
self._edited_entity = None
def publish(self, rset=None):
"""publish the current request, with an optional input rset"""
raise NotImplementedError
# generic methods useful for concrete implementations ######################
def process_rql(self, rql):
"""execute rql if specified"""
# XXX assigning to self really necessary?
self.cw_rset = None
if rql:
self._cw.ensure_ro_rql(rql)
if not isinstance(rql, unicode):
rql = unicode(rql, self._cw.encoding)
pp = self._cw.vreg['components'].select_or_none('magicsearch', self._cw)
if pp is not None:
self.cw_rset = pp.process_query(rql)
return self.cw_rset
def notify_edited(self, entity):
"""called by edit_entity() to notify which entity is edited"""
# NOTE: we can't use entity.rest_path() at this point because
# rest_path() could rely on schema constraints (such as a required
# relation) that might not be satisfied yet (in case of creations)
if not self._edited_entity:
self._edited_entity = entity
def validate_cache(self, view):
view.set_http_cache_headers()
self._cw.validate_cache()
def sendmail(self, recipient, subject, body):
senderemail = self._cw.user.cw_adapt_to('IEmailable').get_email()
msg = format_mail({'email' : senderemail,
'name' : self._cw.user.dc_title(),},
[recipient], body, subject)
if not self._cw.vreg.config.sendmails([(msg, [recipient])]):
msg = self._cw._('could not connect to the SMTP server')
url = self._cw.build_url(__message=msg)
raise Redirect(url)
def reset(self):
"""reset form parameters and redirect to a view determinated by given
parameters
"""
newparams = {}
# sets message if needed
if self._cw.message:
newparams['_cwmsgid'] = self._cw.set_redirect_message(self._cw.message)
if self._cw.form.has_key('__action_apply'):
self._return_to_edition_view(newparams)
if self._cw.form.has_key('__action_cancel'):
self._return_to_lastpage(newparams)
else:
self._return_to_original_view(newparams)
def _return_to_original_view(self, newparams):
"""validate-button case"""
# transforms __redirect[*] parameters into regular form parameters
newparams.update(redirect_params(self._cw.form))
# find out if we have some explicit `rql` needs
rql = newparams.pop('rql', None)
# if rql is needed (explicit __redirectrql or multiple deletions for
# instance), we have to use the old `view?rql=...` form
if rql:
path = 'view'
newparams['rql'] = rql
elif '__redirectpath' in self._cw.form:
# if redirect path was explicitly specified in the form, use it
path = self._cw.form['__redirectpath']
if (self._edited_entity and path != self._edited_entity.rest_path()
and '_cwmsgid' in newparams):
# XXX may be here on modification?
msg = u'(<a href="%s">%s</a>)' % (
xml_escape(self._edited_entity.absolute_url()),
self._cw._('click here to see created entity'))
self._cw.append_to_redirect_message(msg)
elif self._after_deletion_path:
# else it should have been set during form processing
path, params = self._after_deletion_path
params = dict(params) # params given as tuple
params.update(newparams)
newparams = params
elif self._edited_entity:
# clear caches in case some attribute participating to the rest path
# has been modified
self._edited_entity.clear_all_caches()
path = self._edited_entity.rest_path()
else:
path = 'view'
url = self._cw.build_url(path, **newparams)
url = append_url_params(url, self._cw.form.get('__redirectparams'))
raise Redirect(url)
def _return_to_edition_view(self, newparams):
"""apply-button case"""
form = self._cw.form
if self._edited_entity:
path = self._edited_entity.rest_path()
newparams.pop('rql', None)
# else, fallback on the old `view?rql=...` url form
elif 'rql' in self._cw.form:
path = 'view'
newparams['rql'] = form['rql']
else:
self.warning('the edited data seems inconsistent')
path = 'view'
# pick up the correction edition view
if form.get('__form_id'):
newparams['vid'] = form['__form_id']
# re-insert copy redirection parameters
for redirectparam in NAV_FORM_PARAMETERS:
if redirectparam in form:
newparams[redirectparam] = form[redirectparam]
raise Redirect(self._cw.build_url(path, **newparams))
def _return_to_lastpage(self, newparams):
"""cancel-button case: in this case we are always expecting to go back
where we came from, and this is not easy. Currently we suppose that
__redirectpath is specifying that place if found, else we look in the
request breadcrumbs for the last visited page.
"""
if '__redirectpath' in self._cw.form:
# if redirect path was explicitly specified in the form, use it
path = self._cw.form['__redirectpath']
url = self._cw.build_url(path, **newparams)
url = append_url_params(url, self._cw.form.get('__redirectparams'))
else:
url = self._cw.last_visited_page()
raise Redirect(url)
from cubicweb import set_log_methods
set_log_methods(Controller, LOGGER)