[primary] refactor primary view handling of relation's label
to properly handle label optionaly specified in dispctrl (no more default set)
and use contextual translation by default.
Also, consistent handling in attributes, relations and sideboxes section.
Introduce new support_args function to use when possible instead of
try/except TypeError.
# 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/>.
"""
* the vregistry handles various types of objects interacting
together. The vregistry handles registration of dynamically loaded
objects and provides a convenient api to access those objects
according to a context
* to interact with the vregistry, objects should inherit from the
AppObject abstract class
* the selection procedure has been generalized by delegating to a
selector, which is responsible to score the appobject according to the
current state (req, rset, row, col). At the end of the selection, if
a appobject class has been found, an instance of this class is
returned. The selector is instantiated at appobject registration
"""
__docformat__ = "restructuredtext en"
import sys
from os import listdir, stat
from os.path import dirname, join, realpath, isdir, exists
from logging import getLogger
from warnings import warn
from logilab.common.deprecation import deprecated, class_moved
from logilab.common.logging_ext import set_log_methods
from cubicweb import CW_SOFTWARE_ROOT
from cubicweb import RegistryNotFound, ObjectNotFound, NoSelectableObject
from cubicweb.appobject import AppObject, class_regid
def _toload_info(path, extrapath, _toload=None):
"""return a dictionary of <modname>: <modpath> and an ordered list of
(file, module name) to load
"""
from logilab.common.modutils import modpath_from_file
if _toload is None:
assert isinstance(path, list)
_toload = {}, []
for fileordir in path:
if isdir(fileordir) and exists(join(fileordir, '__init__.py')):
subfiles = [join(fileordir, fname) for fname in listdir(fileordir)]
_toload_info(subfiles, extrapath, _toload)
elif fileordir[-3:] == '.py':
modpath = modpath_from_file(fileordir, extrapath)
# omit '__init__' from package's name to avoid loading that module
# once for each name when it is imported by some other appobject
# module. This supposes import in modules are done as::
#
# from package import something
#
# not::
#
# from package.__init__ import something
#
# which seems quite correct.
if modpath[-1] == '__init__':
modpath.pop()
modname = '.'.join(modpath)
_toload[0][modname] = fileordir
_toload[1].append((fileordir, modname))
return _toload
def classid(cls):
"""returns a unique identifier for an appobject class"""
return '%s.%s' % (cls.__module__, cls.__name__)
def class_registries(cls, registryname):
if registryname:
return (registryname,)
return cls.__registries__
class Registry(dict):
def __init__(self, config):
super(Registry, self).__init__()
self.config = config
def __getitem__(self, name):
"""return the registry (dictionary of class objects) associated to
this name
"""
try:
return super(Registry, self).__getitem__(name)
except KeyError:
raise ObjectNotFound(name), None, sys.exc_info()[-1]
def initialization_completed(self):
for appobjects in self.itervalues():
for appobjectcls in appobjects:
appobjectcls.__registered__(self)
def register(self, obj, oid=None, clear=False):
"""base method to add an object in the registry"""
assert not '__abstract__' in obj.__dict__
oid = oid or class_regid(obj)
assert oid
if clear:
appobjects = self[oid] = []
else:
appobjects = self.setdefault(oid, [])
assert not obj in appobjects, \
'object %s is already registered' % obj
appobjects.append(obj)
def register_and_replace(self, obj, replaced):
# XXXFIXME this is a duplication of unregister()
# remove register_and_replace in favor of unregister + register
# or simplify by calling unregister then register here
if not isinstance(replaced, basestring):
replaced = classid(replaced)
registered_objs = self.get(class_regid(obj), ())
for index, registered in enumerate(registered_objs):
if classid(registered) == replaced:
del registered_objs[index]
break
else:
self.warning('trying to replace an unregistered view %s by %s',
replaced, obj)
self.register(obj)
def unregister(self, obj):
clsid = classid(obj)
oid = class_regid(obj)
for registered in self.get(oid, ()):
# use classid() to compare classes because vreg will probably
# have its own version of the class, loaded through execfile
if classid(registered) == clsid:
self[oid].remove(registered)
break
else:
self.warning('can\'t remove %s, no id %s in the registry',
clsid, oid)
def all_objects(self):
"""return a list containing all objects in this registry.
"""
result = []
for objs in self.values():
result += objs
return result
# dynamic selection methods ################################################
def object_by_id(self, oid, *args, **kwargs):
"""return object with the `oid` identifier. Only one object is expected
to be found.
raise :exc:`ObjectNotFound` if not object with id <oid> in <registry>
raise :exc:`AssertionError` if there is more than one object there
"""
objects = self[oid]
assert len(objects) == 1, objects
return objects[0](*args, **kwargs)
def select(self, oid, *args, **kwargs):
"""return the most specific object among those with the given oid
according to the given context.
raise :exc:`ObjectNotFound` if not object with id <oid> in <registry>
raise :exc:`NoSelectableObject` if not object apply
"""
return self._select_best(self[oid], *args, **kwargs)
def select_or_none(self, oid, *args, **kwargs):
"""return the most specific object among those with the given oid
according to the given context, or None if no object applies.
"""
try:
return self.select(oid, *args, **kwargs)
except (NoSelectableObject, ObjectNotFound):
return None
select_object = deprecated('[3.6] use select_or_none instead of select_object'
)(select_or_none)
def possible_objects(self, *args, **kwargs):
"""return an iterator on possible objects in this registry for the given
context
"""
for appobjects in self.itervalues():
try:
yield self._select_best(appobjects, *args, **kwargs)
except NoSelectableObject:
continue
def _select_best(self, appobjects, *args, **kwargs):
"""return an instance of the most specific object according
to parameters
raise `NoSelectableObject` if not object apply
"""
if len(args) > 1:
warn('[3.5] only the request param can not be named when calling select*',
DeprecationWarning, stacklevel=3)
score, winners = 0, None
for appobject in appobjects:
appobjectscore = appobject.__select__(appobject, *args, **kwargs)
if appobjectscore > score:
score, winners = appobjectscore, [appobject]
elif appobjectscore > 0 and appobjectscore == score:
winners.append(appobject)
if winners is None:
raise NoSelectableObject('args: %s\nkwargs: %s %s'
% (args, kwargs.keys(),
[repr(v) for v in appobjects]))
if len(winners) > 1:
# log in production environement / test, error while debugging
if self.config.debugmode or self.config.mode == 'test':
raise Exception('select ambiguity, args: %s\nkwargs: %s %s'
% (args, kwargs.keys(),
[repr(v) for v in winners]))
self.error('select ambiguity, args: %s\nkwargs: %s %s',
args, kwargs.keys(), [repr(v) for v in winners])
# return the result of calling the appobject
return winners[0](*args, **kwargs)
select_best = deprecated('[3.6] select_best is now private')(_select_best)
class VRegistry(dict):
"""class responsible to register, propose and select the various
elements used to build the web interface. Currently, we have templates,
views, actions and components.
"""
def __init__(self, config):
super(VRegistry, self).__init__()
self.config = config
# need to clean sys.path this to avoid import confusion pb (i.e. having
# the same module loaded as 'cubicweb.web.views' subpackage and as
# views' or 'web.views' subpackage. This is mainly for testing purpose,
# we should'nt need this in production environment
for webdir in (join(dirname(realpath(__file__)), 'web'),
join(dirname(__file__), 'web')):
if webdir in sys.path:
sys.path.remove(webdir)
if CW_SOFTWARE_ROOT in sys.path:
sys.path.remove(CW_SOFTWARE_ROOT)
def reset(self):
# don't use self.clear, we want to keep existing subdictionaries
for subdict in self.itervalues():
subdict.clear()
self._lastmodifs = {}
def __getitem__(self, name):
"""return the registry (dictionary of class objects) associated to
this name
"""
try:
return super(VRegistry, self).__getitem__(name)
except KeyError:
raise RegistryNotFound(name), None, sys.exc_info()[-1]
# dynamic selection methods ################################################
@deprecated('[3.4] use vreg[registry].object_by_id(oid, *args, **kwargs)')
def object_by_id(self, registry, oid, *args, **kwargs):
"""return object in <registry>.<oid>
raise `ObjectNotFound` if not object with id <oid> in <registry>
raise `AssertionError` if there is more than one object there
"""
return self[registry].object_by_id(oid)
@deprecated('[3.4] use vreg[registry].select(oid, *args, **kwargs)')
def select(self, registry, oid, *args, **kwargs):
"""return the most specific object in <registry>.<oid> according to
the given context
raise `ObjectNotFound` if not object with id <oid> in <registry>
raise `NoSelectableObject` if not object apply
"""
return self[registry].select(oid, *args, **kwargs)
@deprecated('[3.4] use vreg[registry].select_or_none(oid, *args, **kwargs)')
def select_object(self, registry, oid, *args, **kwargs):
"""return the most specific object in <registry>.<oid> according to
the given context, or None if no object apply
"""
return self[registry].select_or_none(oid, *args, **kwargs)
@deprecated('[3.4] use vreg[registry].possible_objects(*args, **kwargs)')
def possible_objects(self, registry, *args, **kwargs):
"""return an iterator on possible objects in <registry> for the given
context
"""
return self[registry].possible_objects(*args, **kwargs)
# methods for explicit (un)registration ###################################
# default class, when no specific class set
REGISTRY_FACTORY = {None: Registry}
def registry_class(self, regid):
try:
return self.REGISTRY_FACTORY[regid]
except KeyError:
return self.REGISTRY_FACTORY[None]
def setdefault(self, regid):
try:
return self[regid]
except KeyError:
self[regid] = self.registry_class(regid)(self.config)
return self[regid]
# def clear(self, key):
# regname, oid = key.split('.')
# self[regname].pop(oid, None)
def register_all(self, objects, modname, butclasses=()):
"""register all `objects` given. Objects which are not from the module
`modname` or which are in `butclasses` won't be registered.
Typical usage is:
.. sourcecode:: python
vreg.register_all(globals().values(), __name__, (ClassIWantToRegisterExplicitly,))
So you get partially automatic registration, keeping manual registration
for some object (to use
:meth:`~cubicweb.cwvreg.CubicWebRegistry.register_and_replace` for
instance)
"""
for obj in objects:
try:
if obj.__module__ != modname or obj in butclasses:
continue
oid = class_regid(obj)
except AttributeError:
continue
if oid and not '__abstract__' in obj.__dict__:
self.register(obj, oid=oid)
def register(self, obj, registryname=None, oid=None, clear=False):
"""register `obj` application object into `registryname` or
`obj.__registry__` if not specified, with identifier `oid` or
`obj.__regid__` if not specified.
If `clear` is true, all objects with the same identifier will be
previously unregistered.
"""
assert not '__abstract__' in obj.__dict__
try:
vname = obj.__name__
except AttributeError:
# XXX may occurs?
vname = obj.__class__.__name__
for registryname in class_registries(obj, registryname):
registry = self.setdefault(registryname)
registry.register(obj, oid=oid, clear=clear)
self.debug('register %s in %s[\'%s\']',
vname, registryname, oid or class_regid(obj))
self._loadedmods.setdefault(obj.__module__, {})[classid(obj)] = obj
def unregister(self, obj, registryname=None):
"""unregister `obj` application object from the registry `registryname` or
`obj.__registry__` if not specified.
"""
for registryname in class_registries(obj, registryname):
self[registryname].unregister(obj)
def register_and_replace(self, obj, replaced, registryname=None):
"""register `obj` application object into `registryname` or
`obj.__registry__` if not specified. If found, the `replaced` object
will be unregistered first (else a warning will be issued as it's
generally unexpected).
"""
for registryname in class_registries(obj, registryname):
self[registryname].register_and_replace(obj, replaced)
# initialization methods ###################################################
def init_registration(self, path, extrapath=None):
self.reset()
# compute list of all modules that have to be loaded
self._toloadmods, filemods = _toload_info(path, extrapath)
# XXX is _loadedmods still necessary ? It seems like it's useful
# to avoid loading same module twice, especially with the
# _load_ancestors_then_object logic but this needs to be checked
self._loadedmods = {}
return filemods
def register_objects(self, path, extrapath=None):
# load views from each directory in the instance's path
filemods = self.init_registration(path, extrapath)
for filepath, modname in filemods:
self.load_file(filepath, modname)
self.initialization_completed()
def initialization_completed(self):
for regname, reg in self.iteritems():
reg.initialization_completed()
def _mdate(self, filepath):
try:
return stat(filepath)[-2]
except OSError:
# this typically happens on emacs backup files (.#foo.py)
self.warning('Unable to load %s. It is likely to be a backup file',
filepath)
return None
def is_reload_needed(self, path):
"""return True if something module changed and the registry should be
reloaded
"""
lastmodifs = self._lastmodifs
for fileordir in path:
if isdir(fileordir) and exists(join(fileordir, '__init__.py')):
if self.is_reload_needed([join(fileordir, fname)
for fname in listdir(fileordir)]):
return True
elif fileordir[-3:] == '.py':
mdate = self._mdate(fileordir)
if mdate is None:
continue # backup file, see _mdate implementation
elif "flymake" in fileordir:
# flymake + pylint in use, don't consider these they will corrupt the registry
continue
if fileordir not in lastmodifs or lastmodifs[fileordir] < mdate:
self.info('File %s changed since last visit', fileordir)
return True
return False
def load_file(self, filepath, modname):
"""load app objects from a python file"""
from logilab.common.modutils import load_module_from_name
if modname in self._loadedmods:
return
self._loadedmods[modname] = {}
mdate = self._mdate(filepath)
if mdate is None:
return # backup file, see _mdate implementation
elif "flymake" in filepath:
# flymake + pylint in use, don't consider these they will corrupt the registry
return
# set update time before module loading, else we get some reloading
# weirdness in case of syntax error or other error while importing the
# module
self._lastmodifs[filepath] = mdate
# load the module
module = load_module_from_name(modname)
self.load_module(module)
def load_module(self, module):
self.info('loading %s', module)
if hasattr(module, 'registration_callback'):
module.registration_callback(self)
else:
for objname, obj in vars(module).items():
if objname.startswith('_'):
continue
self._load_ancestors_then_object(module.__name__, obj)
def _load_ancestors_then_object(self, modname, appobjectcls):
"""handle automatic appobject class registration:
- first ensure parent classes are already registered
- class with __abstract__ == True in their local dictionnary or
with a name starting starting by an underscore are not registered
- appobject class needs to have __registry__ and __regid__ attributes
set to a non empty string to be registered.
"""
# imported classes
objmodname = getattr(appobjectcls, '__module__', None)
if objmodname != modname:
if objmodname in self._toloadmods:
self.load_file(self._toloadmods[objmodname], objmodname)
return
# skip non registerable object
try:
if not issubclass(appobjectcls, AppObject):
return
except TypeError:
return
clsid = classid(appobjectcls)
if clsid in self._loadedmods[modname]:
return
self._loadedmods[modname][clsid] = appobjectcls
for parent in appobjectcls.__bases__:
self._load_ancestors_then_object(modname, parent)
if (appobjectcls.__dict__.get('__abstract__')
or appobjectcls.__name__[0] == '_'
or not appobjectcls.__registries__
or not class_regid(appobjectcls)):
return
try:
self.register(appobjectcls)
except Exception, ex:
if self.config.mode in ('test', 'dev'):
raise
self.exception('appobject %s registration failed: %s',
appobjectcls, ex)
# init logging
set_log_methods(VRegistry, getLogger('cubicweb.vreg'))
set_log_methods(Registry, getLogger('cubicweb.registry'))
# XXX bw compat functions #####################################################
from cubicweb.appobject import objectify_selector, AndSelector, OrSelector, Selector
objectify_selector = deprecated('[3.4] objectify_selector has been moved to appobject module')(objectify_selector)
Selector = class_moved(Selector)
@deprecated('[3.4] use & operator (binary and)')
def chainall(*selectors, **kwargs):
"""return a selector chaining given selectors. If one of
the selectors fail, selection will fail, else the returned score
will be the sum of each selector'score
"""
assert selectors
# XXX do we need to create the AndSelector here, a tuple might be enough
selector = AndSelector(*selectors)
if 'name' in kwargs:
selector.__name__ = kwargs['name']
return selector
@deprecated('[3.4] use | operator (binary or)')
def chainfirst(*selectors, **kwargs):
"""return a selector chaining given selectors. If all
the selectors fail, selection will fail, else the returned score
will be the first non-zero selector score
"""
assert selectors
selector = OrSelector(*selectors)
if 'name' in kwargs:
selector.__name__ = kwargs['name']
return selector