mixins.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 02 Apr 2010 09:56:40 +0200
branchstable
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child 5309 e8567135a927
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[doc] enhanced setup section: fix sections'level, more postgres tips, merge environment doc with cwconfig.py module docstring using custom autodocstring directive
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"""mixins of entity/views organized somewhat in a graph or tree structure
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from itertools import chain
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from logilab.common.decorators import cached
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from cubicweb.selectors import implements
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from cubicweb.interfaces import IEmailable, ITree
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class TreeMixIn(object):
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    """base tree-mixin providing the tree interface
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    This mixin has to be inherited explicitly and configured using the
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    tree_attribute, parent_target and children_target class attribute to
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    benefit from this default implementation
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    """
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    tree_attribute = None
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    # XXX misnamed
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    parent_target = 'subject'
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    children_target = 'object'
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    def different_type_children(self, entities=True):
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        """return children entities of different type as this entity.
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        according to the `entities` parameter, return entity objects or the
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        equivalent result set
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        """
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        res = self.related(self.tree_attribute, self.children_target,
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                           entities=entities)
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        if entities:
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            return [e for e in res if e.e_schema != self.e_schema]
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        return res.filtered_rset(lambda x: x.e_schema != self.e_schema, self.cw_col)
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    def same_type_children(self, entities=True):
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        """return children entities of the same type as this entity.
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        according to the `entities` parameter, return entity objects or the
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        equivalent result set
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        """
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        res = self.related(self.tree_attribute, self.children_target,
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                           entities=entities)
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        if entities:
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            return [e for e in res if e.e_schema == self.e_schema]
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        return res.filtered_rset(lambda x: x.e_schema is self.e_schema, self.cw_col)
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    def iterchildren(self, _done=None):
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        if _done is None:
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            _done = set()
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        for child in self.children():
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            if child.eid in _done:
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                self.error('loop in %s tree', self.__regid__.lower())
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                continue
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            yield child
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            _done.add(child.eid)
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    def prefixiter(self, _done=None):
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        if _done is None:
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            _done = set()
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        if self.eid in _done:
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            return
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        _done.add(self.eid)
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        yield self
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        for child in self.same_type_children():
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            for entity in child.prefixiter(_done):
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                yield entity
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    @cached
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    def path(self):
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        """returns the list of eids from the root object to this object"""
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        path = []
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        parent = self
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        while parent:
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            if parent.eid in path:
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                self.error('loop in %s tree', self.__regid__.lower())
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                break
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            path.append(parent.eid)
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            try:
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                # check we are not leaving the tree
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                if (parent.tree_attribute != self.tree_attribute or
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                    parent.parent_target != self.parent_target):
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                    break
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                parent = parent.parent()
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            except AttributeError:
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                break
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        path.reverse()
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        return path
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    def iterparents(self, strict=True):
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        def _uptoroot(self):
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            curr = self
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            while True:
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                curr = curr.parent()
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                if curr is None:
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                    break
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                yield curr
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        if not strict:
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            return chain([self], _uptoroot(self))
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        return _uptoroot(self)
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    def notification_references(self, view):
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        """used to control References field of email send on notification
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        for this entity. `view` is the notification view.
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        Should return a list of eids which can be used to generate message ids
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        of previously sent email
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        """
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        return self.path()[:-1]
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    ## ITree interface ########################################################
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    def parent(self):
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        """return the parent entity if any, else None (e.g. if we are on the
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        root
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        """
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        try:
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            return self.related(self.tree_attribute, self.parent_target,
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                                entities=True)[0]
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        except (KeyError, IndexError):
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            return None
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    def children(self, entities=True, sametype=False):
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        """return children entities
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        according to the `entities` parameter, return entity objects or the
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        equivalent result set
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        """
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        if sametype:
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            return self.same_type_children(entities)
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        else:
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            return self.related(self.tree_attribute, self.children_target,
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                                entities=entities)
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    def children_rql(self):
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        return self.related_rql(self.tree_attribute, self.children_target)
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0
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    def is_leaf(self):
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        return len(self.children()) == 0
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    def is_root(self):
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        return self.parent() is None
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    def root(self):
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        """return the root object"""
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        return self._cw.entity_from_eid(self.path()[0])
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class EmailableMixIn(object):
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    """base mixin providing the default get_email() method used by
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    the massmailing view
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    NOTE: The default implementation is based on the
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    primary_email / use_email scheme
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    """
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    __implements__ = (IEmailable,)
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0
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    def get_email(self):
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        if getattr(self, 'primary_email', None):
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            return self.primary_email[0].address
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        if getattr(self, 'use_email', None):
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            return self.use_email[0].address
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        return None
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    @classmethod
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    def allowed_massmail_keys(cls):
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        """returns a set of allowed email substitution keys
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        The default is to return the entity's attribute list but an
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        entity class might override this method to allow extra keys.
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        For instance, the Person class might want to return a `companyname`
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        key.
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        """
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        return set(rschema.type
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                   for rschema, attrtype in cls.e_schema.attribute_definitions()
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                   if attrtype.type not in ('Password', 'Bytes'))
0
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    def as_email_context(self):
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        """returns the dictionary as used by the sendmail controller to
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        build email bodies.
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0
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        NOTE: the dictionary keys should match the list returned by the
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        `allowed_massmail_keys` method.
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        """
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        return dict( (attr, getattr(self, attr)) for attr in self.allowed_massmail_keys() )
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"""pluggable mixins system: plug classes registered in MI_REL_TRIGGERS on entity
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classes which have the relation described by the dict's key.
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NOTE: pluggable mixins can't override any method of the 'explicit' user classes tree
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(eg without plugged classes). This includes bases Entity and AnyEntity classes.
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"""
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MI_REL_TRIGGERS = {
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    ('primary_email',   'subject'): EmailableMixIn,
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    ('use_email',   'subject'): EmailableMixIn,
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    }
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def _done_init(done, view, row, col):
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    """handle an infinite recursion safety belt"""
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    if done is None:
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        done = set()
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    entity = view.cw_rset.get_entity(row, col)
0
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    if entity.eid in done:
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        msg = entity._cw._('loop in %(rel)s relation (%(eid)s)') % {
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            'rel': entity.tree_attribute,
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            'eid': entity.eid
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            }
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        return None, msg
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    done.add(entity.eid)
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    return done, entity
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class TreeViewMixIn(object):
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    """a recursive tree view"""
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    __regid__ = 'tree'
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    item_vid = 'treeitem'
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    __select__ = implements(ITree)
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    def call(self, done=None, **kwargs):
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        if done is None:
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            done = set()
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        super(TreeViewMixIn, self).call(done=done, **kwargs)
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    def cell_call(self, row, col=0, vid=None, done=None, **kwargs):
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        done, entity = _done_init(done, self, row, col)
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        if done is None:
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            # entity is actually an error message
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            self.w(u'<li class="badcontent">%s</li>' % entity)
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            return
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        self.open_item(entity)
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        entity.view(vid or self.item_vid, w=self.w, **kwargs)
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        relatedrset = entity.children(entities=False)
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        self.wview(self.__regid__, relatedrset, 'null', done=done, **kwargs)
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        self.close_item(entity)
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    def open_item(self, entity):
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        self.w(u'<li class="%s">\n' % entity.__regid__.lower())
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    def close_item(self, entity):
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        self.w(u'</li>\n')
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class TreePathMixIn(object):
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    """a recursive path view"""
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    __regid__ = 'path'
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    item_vid = 'oneline'
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    separator = u'&#160;&gt;&#160;'
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    def call(self, **kwargs):
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        self.w(u'<div class="pathbar">')
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        super(TreePathMixIn, self).call(**kwargs)
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        self.w(u'</div>')
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0
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    def cell_call(self, row, col=0, vid=None, done=None, **kwargs):
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        done, entity = _done_init(done, self, row, col)
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        if done is None:
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            # entity is actually an error message
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            self.w(u'<span class="badcontent">%s</span>' % entity)
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            return
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        parent = entity.parent()
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        if parent:
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            parent.view(self.__regid__, w=self.w, done=done)
0
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            self.w(self.separator)
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        entity.view(vid or self.item_vid, w=self.w)
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class ProgressMixIn(object):
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    """provide default implementations for IProgress interface methods"""
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    # This is an adapter isn't it ?
0
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    @property
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    def cost(self):
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        return self.progress_info()['estimated']
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    @property
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    def revised_cost(self):
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        return self.progress_info().get('estimatedcorrected', self.cost)
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    @property
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    def done(self):
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        return self.progress_info()['done']
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    @property
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    def todo(self):
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        return self.progress_info()['todo']
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    @cached
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    def progress_info(self):
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        raise NotImplementedError()
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    def finished(self):
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        return not self.in_progress()
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    def in_progress(self):
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        raise NotImplementedError()
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0
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    def progress(self):
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        try:
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            return 100. * self.done / self.revised_cost
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        except ZeroDivisionError:
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            # total cost is 0 : if everything was estimated, task is completed
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            if self.progress_info().get('notestimated'):
0
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                return 0.
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            return 100