vregistry.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
Wed, 05 Nov 2008 15:52:50 +0100
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"""
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* the vregistry handle various type of objects interacting
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  together. The vregistry handle registration of dynamically loaded
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  objects and provide a convenient api access to those objects
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  according to a context
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* to interact with the vregistry, object should inherit from the
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  VObject abstract class
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* the registration procedure is delegated to a registerer. Each
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  registerable vobject must defines its registerer class using the
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  __registerer__ attribute.  A registerer is instantianted at
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  registration time after what the instance is lost
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* the selection procedure has been generalized by delegating to a
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  selector, which is responsible to score the vobject according to the
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  current state (req, rset, row, col). At the end of the selection, if
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  a vobject class has been found, an instance of this class is
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  returned. The selector is instantiated at vobject registration
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:organization: Logilab
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:copyright: 2001-2008 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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import sys
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from os import listdir, stat
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from os.path import dirname, join, realpath, split, isdir
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from logging import getLogger
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from cubicweb import CW_SOFTWARE_ROOT, set_log_methods
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from cubicweb import RegistryNotFound, ObjectNotFound, NoSelectableObject
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class vobject_helper(object):
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    """object instantiated at registration time to help a wrapped
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    VObject subclass
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    """
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    def __init__(self, registry, vobject):
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        self.registry = registry
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        self.vobject = vobject
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        self.config = registry.config
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        self.schema = registry.schema
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class registerer(vobject_helper):
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    """do whatever is needed at registration time for the wrapped
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    class, according to current application schema and already
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    registered objects of the same kind (i.e. same registry name and
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    same id).
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    The wrapped class may be skipped, some previously selected object
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    may be kicked out... After whatever works needed, if the object or
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    a transformed object is returned, it will be added to previously
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    registered objects.
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    """
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    def __init__(self, registry, vobject):
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        super(registerer, self).__init__(registry, vobject)
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        self.kicked = set()
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    def do_it_yourself(self, registered):
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        raise NotImplementedError(str(self.vobject))
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    def kick(self, registered, kicked):
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        self.debug('kicking vobject %s', kicked)
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        registered.remove(kicked)
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        self.kicked.add(kicked.classid())
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    def skip(self):
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        self.debug('no schema compat, skipping %s', self.vobject)
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def selector(cls, *args, **kwargs):
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    """selector is called to help choosing the correct object for a
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    particular request and result set by returning a score.
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    it must implement a .score_method taking a request, a result set and
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    optionaly row and col arguments which return an int telling how well
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    the wrapped class apply to the given request and result set. 0 score
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    means that it doesn't apply.
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    rset may be None. If not, row and col arguments may be optionally
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    given if the registry is scoring a given row or a given cell of
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    the result set (both row and col are int if provided).
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    """    
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    raise NotImplementedError(cls)
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class autoselectors(type):
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    """implements __selectors__ / __select__ compatibility layer so that:
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    __select__ = chainall(classmethod(A, B, C))
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    can be replaced by something like:
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    __selectors__ = (A, B, C)
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    """
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    def __new__(mcs, name, bases, classdict):
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        if '__select__' in classdict and '__selectors__' in classdict:
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            raise TypeError("__select__ and __selectors__ "
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                            "can't be used together")
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        if '__select__' not in classdict and '__selectors__' in classdict:
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            selectors = classdict['__selectors__']
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            classdict['__select__'] = classmethod(chainall(*selectors))
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        return super(autoselectors, mcs).__new__(mcs, name, bases, classdict)
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    def __setattr__(self, attr, value):
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        if attr == '__selectors__':
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            self.__select__ = classmethod(chainall(*value))
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        super(autoselectors, self).__setattr__(attr, value)
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class VObject(object):
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    """visual object, use to be handled somehow by the visual components
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    registry.
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    The following attributes should be set on concret vobject subclasses:
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    :__registry__:
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      name of the registry for this object (string like 'views',
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      'templates'...)
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    :id:
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      object's identifier in the registry (string like 'main',
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      'primary', 'folder_box')
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    :__registerer__:
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      registration helper class
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    :__select__:
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      selection helper function
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    :__selectors__:
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      tuple of selectors to be chained
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      (__select__ and __selectors__ are mutually exclusive)
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    Moreover, the `__abstract__` attribute may be set to True to indicate
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    that a vobject is abstract and should not be registered
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    """
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    __metaclass__ = autoselectors
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    # necessary attributes to interact with the registry
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    id = None
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    __registry__ = None
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    __registerer__ = None
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    __select__ = None
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    @classmethod
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    def registered(cls, registry):
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        """called by the registry when the vobject has been registered.
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        It must return the  object that will be actually registered (this
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        may be the right hook to create an instance for example). By
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        default the vobject is returned without any transformation.
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        """
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        return cls
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    @classmethod
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    def selected(cls, *args, **kwargs):
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        """called by the registry when the vobject has been selected.
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        It must return the  object that will be actually returned by the
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        .select method (this may be the right hook to create an
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        instance for example). By default the selected object is
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        returned without any transformation.
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        """
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        return cls
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    @classmethod
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    def classid(cls):
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        """returns a unique identifier for the vobject"""
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        return '%s.%s' % (cls.__module__, cls.__name__)
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class VRegistry(object):
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    """class responsible to register, propose and select the various
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    elements used to build the web interface. Currently, we have templates,
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    views, actions and components.
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    """
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    def __init__(self, config):#, cache_size=1000):
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        self.config = config
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        # dictionnary of registry (themself dictionnary) by name
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        self._registries = {}
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        self._lastmodifs = {}
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    def reset(self):
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        self._registries = {}
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        self._lastmodifs = {}
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    def __getitem__(self, key):
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        return self._registries[key]
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    def get(self, key, default=None):
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        return self._registries.get(key, default)
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    def items(self):
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        return self._registries.items()
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    def values(self):
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        return self._registries.values()
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    def __contains__(self, key):
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        return key in self._registries
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    def register_vobject_class(self, cls, _kicked=set()):
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        """handle vobject class registration
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        vobject class with __abstract__ == True in their local dictionnary or
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        with a name starting starting by an underscore are not registered.
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        Also a vobject class needs to have __registry__ and id attributes set
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        to a non empty string to be registered.
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        Registration is actually handled by vobject's registerer.
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        """
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        if (cls.__dict__.get('__abstract__') or cls.__name__[0] == '_'
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            or not cls.__registry__ or not cls.id):
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            return
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        # while reloading a module :
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        # if cls was previously kicked, it means that there is a more specific
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        # vobject defined elsewhere re-registering cls would kick it out
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        if cls.classid() in _kicked:
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            self.debug('not re-registering %s because it was previously kicked',
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                      cls.classid())
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        else:
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            regname = cls.__registry__
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            if cls.id in self.config['disable-%s' % regname]:
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                return
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            registry = self._registries.setdefault(regname, {})
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            vobjects = registry.setdefault(cls.id, [])
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            registerer = cls.__registerer__(self, cls)
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            cls = registerer.do_it_yourself(vobjects)
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            #_kicked |= registerer.kicked
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            if cls:
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                vobject = cls.registered(self)
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                try:
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                    vname = vobject.__name__
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                except AttributeError:
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                    vname = vobject.__class__.__name__
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                self.debug('registered vobject %s in registry %s with id %s',
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                          vname, cls.__registry__, cls.id)
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                vobjects.append(vobject)
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    def unregister_module_vobjects(self, modname):
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        """removes registered objects coming from a given module
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        returns a dictionnary classid/class of all classes that will need
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        to be updated after reload (i.e. vobjects referencing classes defined
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        in the <modname> module)
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        """
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        unregistered = {}
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        # browse each registered object
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        for registry, objdict in self.items():
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            for oid, objects in objdict.items():
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                for obj in objects[:]:
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                    objname = obj.classid()
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                    # if the vobject is defined in this module, remove it
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                    if objname.startswith(modname):
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                        unregistered[objname] = obj
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                        objects.remove(obj)
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                        self.debug('unregistering %s in %s registry',
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                                  objname, registry)
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                    # if not, check if the vobject can be found in baseclasses
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                    # (because we also want subclasses to be updated)
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                    else:
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                        if not isinstance(obj, type):
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                            obj = obj.__class__
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                        for baseclass in obj.__bases__:
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                            if hasattr(baseclass, 'classid'):
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                                baseclassid = baseclass.classid()
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   270
                                if baseclassid.startswith(modname):
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   271
                                    unregistered[baseclassid] = baseclass
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                # update oid entry
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   273
                if objects:
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   274
                    objdict[oid] = objects
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   275
                else:
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   276
                    del objdict[oid]
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   277
        return unregistered
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   278
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   279
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   280
    def update_registered_subclasses(self, oldnew_mapping):
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   281
        """updates subclasses of re-registered vobjects
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   282
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   283
        if baseviews.PrimaryView is changed, baseviews.py will be reloaded
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   284
        automatically and the new version of PrimaryView will be registered.
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   285
        But all existing subclasses must also be notified of this change, and
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   286
        that's what this method does
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   287
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   288
        :param oldnew_mapping: a dict mapping old version of a class to
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   289
                               the new version
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parents:
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   290
        """
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   291
        # browse each registered object
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   292
        for objdict in self.values():
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   293
            for objects in objdict.values():
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   294
                for obj in objects:
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diff changeset
   295
                    if not isinstance(obj, type):
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   296
                        obj = obj.__class__
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   297
                    # build new baseclasses tuple
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   298
                    newbases = tuple(oldnew_mapping.get(baseclass, baseclass)
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   299
                                     for baseclass in obj.__bases__)
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   300
                    # update obj's baseclasses tuple (__bases__) if needed
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   301
                    if newbases != obj.__bases__:
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   302
                        self.debug('updating %s.%s base classes',
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   303
                                  obj.__module__, obj.__name__)
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   304
                        obj.__bases__ = newbases
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parents:
diff changeset
   305
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   306
    def registry(self, name):
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   307
        """return the registry (dictionary of class objects) associated to
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diff changeset
   308
        this name
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parents:
diff changeset
   309
        """
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diff changeset
   310
        try:
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   311
            return self._registries[name]
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   312
        except KeyError:
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parents:
diff changeset
   313
            raise RegistryNotFound(name), None, sys.exc_info()[-1]
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parents:
diff changeset
   314
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parents:
diff changeset
   315
    def registry_objects(self, name, oid=None):
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parents:
diff changeset
   316
        """returns objects registered with the given oid in the given registry.
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parents:
diff changeset
   317
        If no oid is given, return all objects in this registry
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parents:
diff changeset
   318
        """
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parents:
diff changeset
   319
        registry = self.registry(name)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   320
        if oid:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   321
            try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   322
                return registry[oid]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   323
            except KeyError:
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parents:
diff changeset
   324
                raise ObjectNotFound(oid), None, sys.exc_info()[-1]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   325
        else:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   326
            result = []
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   327
            for objs in registry.values():
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   328
                result += objs
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   329
            return result
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   330
        
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   331
    def select(self, vobjects, *args, **kwargs):
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parents:
diff changeset
   332
        """return an instance of the most specific object according
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   333
        to parameters
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   334
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   335
        raise NoSelectableObject if not object apply
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   336
        """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   337
        score, winner = 0, None
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   338
        for vobject in vobjects:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   339
            vobjectscore = vobject.__select__(*args, **kwargs)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   340
            if vobjectscore > score:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   341
                score, winner = vobjectscore, vobject
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   342
        if winner is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   343
            raise NoSelectableObject('args: %s\nkwargs: %s %s'
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   344
                                     % (args, kwargs.keys(), [repr(v) for v in vobjects]))
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parents:
diff changeset
   345
        # return the result of the .selected method of the vobject
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   346
        return winner.selected(*args, **kwargs)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   347
    
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   348
    def possible_objects(self, registry, *args, **kwargs):
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parents:
diff changeset
   349
        """return an iterator on possible objects in a registry for this result set
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   350
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   351
        actions returned are classes, not instances
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   352
        """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   353
        for vobjects in self.registry(registry).values():
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   354
            try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   355
                yield self.select(vobjects, *args, **kwargs)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   356
            except NoSelectableObject:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   357
                continue
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   358
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   359
    def select_object(self, registry, cid, *args, **kwargs):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   360
        """return the most specific component according to the resultset"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   361
        return self.select(self.registry_objects(registry, cid), *args, **kwargs)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   362
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   363
    def object_by_id(self, registry, cid, *args, **kwargs):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   364
        """return the most specific component according to the resultset"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   365
        objects = self[registry][cid]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   366
        assert len(objects) == 1, objects
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   367
        return objects[0].selected(*args, **kwargs)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   368
    
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   369
    # intialization methods ###################################################
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   370
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   371
    
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   372
    def register_objects(self, path, force_reload=None):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   373
        if force_reload is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   374
            force_reload = self.config.mode == 'dev'
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   375
        elif not force_reload:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   376
            # force_reload == False usually mean modules have been reloaded
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   377
            # by another connection, so we want to update the registry
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   378
            # content even if there has been no module content modification
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   379
            self.reset()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   380
        # need to clean sys.path this to avoid import confusion pb (i.e.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   381
        # having the same module loaded as 'cubicweb.web.views' subpackage and
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   382
        # as views'  or 'web.views' subpackage
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
        # this is mainly for testing purpose, we should'nt need this in
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   384
        # production environment
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
        for webdir in (join(dirname(realpath(__file__)), 'web'),
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
                       join(dirname(__file__), 'web')):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   387
            if webdir in sys.path:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
                sys.path.remove(webdir)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   389
        if CW_SOFTWARE_ROOT in sys.path:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   390
            sys.path.remove(CW_SOFTWARE_ROOT)        
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
        # load views from each directory in the application's path
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   392
        change = False
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
        for fileordirectory in path:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   394
            if isdir(fileordirectory):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   395
                if self.read_directory(fileordirectory, force_reload):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   396
                    change = True
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   397
            else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   398
                directory, filename = split(fileordirectory)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
                if self.load_file(directory, filename, force_reload):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
                    change = True
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
        if change:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
            for registry, objects in self.items():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   403
                self.debug('available in registry %s: %s', registry,
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
                           sorted(objects))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
        return change
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   406
    
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
    def read_directory(self, directory, force_reload=False):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   408
        """read a directory and register available views"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   409
        modified_on = stat(realpath(directory))[-2]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   410
        # only read directory if it was modified
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
        _lastmodifs = self._lastmodifs
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
        if directory in _lastmodifs and modified_on <= _lastmodifs[directory]:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
            return False
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   414
        self.info('loading directory %s', directory)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   415
        for filename in listdir(directory):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   416
            if filename[-3:] == '.py':
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   417
                try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
                    self.load_file(directory, filename, force_reload)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
                except OSError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   420
                    # this typically happens on emacs backup files (.#foo.py)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   421
                    self.warning('Unable to load file %s. It is likely to be a backup file',
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   422
                                 filename)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   423
                except Exception, ex:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   424
                    if self.config.mode in ('dev', 'test'):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   425
                        raise
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   426
                    self.exception('%r while loading file %s', ex, filename)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   427
        _lastmodifs[directory] = modified_on
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   428
        return True
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   429
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   430
    def load_file(self, directory, filename, force_reload=False):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   431
        """load visual objects from a python file"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   432
        from logilab.common.modutils import load_module_from_modpath, modpath_from_file
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   433
        filepath = join(directory, filename)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   434
        modified_on = stat(filepath)[-2]
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   435
        modpath = modpath_from_file(join(directory, filename))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   436
        modname = '.'.join(modpath)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   437
        unregistered = {}
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   438
        _lastmodifs = self._lastmodifs
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   439
        if filepath in _lastmodifs:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   440
            # only load file if it was modified
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   441
            if modified_on <= _lastmodifs[filepath]:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   442
                return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   443
            else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   444
                # if it was modified, unregister all exisiting objects
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   445
                # from this module, and keep track of what was unregistered
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   446
                unregistered = self.unregister_module_vobjects(modname)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   447
        # load the module
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   448
        module = load_module_from_modpath(modpath, use_sys=not force_reload)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   449
        registered = self.load_module(module)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   450
        # if something was unregistered, we need to update places where it was
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   451
        # referenced 
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   452
        if unregistered:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   453
            # oldnew_mapping = {}
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   454
            oldnew_mapping = dict((unregistered[name], registered[name])
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   455
                                  for name in unregistered if name in registered)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   456
            self.update_registered_subclasses(oldnew_mapping)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   457
        _lastmodifs[filepath] = modified_on
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   458
        return True
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   459
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   460
    def load_module(self, module):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   461
        registered = {}
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   462
        self.info('loading %s', module)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   463
        for objname, obj in vars(module).items():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   464
            if objname.startswith('_'):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   465
                continue
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   466
            self.load_ancestors_then_object(module.__name__, registered, obj)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   467
        return registered
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   468
    
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   469
    def load_ancestors_then_object(self, modname, registered, obj):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   470
        # skip imported classes
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   471
        if getattr(obj, '__module__', None) != modname:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   472
            return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   473
        # skip non registerable object
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   474
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   475
            if not issubclass(obj, VObject):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   476
                return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   477
        except TypeError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   478
            return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   479
        objname = '%s.%s' % (modname, obj.__name__)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   480
        if objname in registered:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   481
            return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   482
        registered[objname] = obj
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   483
        for parent in obj.__bases__:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   484
            self.load_ancestors_then_object(modname, registered, parent)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   485
        self.load_object(obj)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   486
            
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   487
    def load_object(self, obj):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   488
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   489
            self.register_vobject_class(obj)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   490
        except Exception, ex:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   491
            if self.config.mode in ('test', 'dev'):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   492
                raise
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   493
            self.exception('vobject %s registration failed: %s', obj, ex)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   494
        
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   495
# init logging 
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   496
set_log_methods(VObject, getLogger('cubicweb'))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   497
set_log_methods(VRegistry, getLogger('cubicweb.registry'))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   498
set_log_methods(registerer, getLogger('cubicweb.registration'))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   499
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   500
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   501
# advanced selector building functions ########################################
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   502
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   503
def chainall(*selectors):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   504
    """return a selector chaining given selectors. If one of
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   505
    the selectors fail, selection will fail, else the returned score
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   506
    will be the sum of each selector'score
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   507
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   508
    assert selectors
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   509
    def selector(cls, *args, **kwargs):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   510
        score = 0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   511
        for selector in selectors:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   512
            partscore = selector(cls, *args, **kwargs)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   513
            if not partscore:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   514
                return 0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   515
            score += partscore
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   516
        return score
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   517
    return selector
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   518
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   519
def chainfirst(*selectors):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   520
    """return a selector chaining given selectors. If all
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   521
    the selectors fail, selection will fail, else the returned score
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   522
    will be the first non-zero selector score
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   523
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   524
    assert selectors
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   525
    def selector(cls, *args, **kwargs):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   526
        for selector in selectors:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   527
            partscore = selector(cls, *args, **kwargs)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   528
            if partscore:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   529
                return partscore
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   530
        return 0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   531
    return selector
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   532