mixins.py
author Alexandre Fayolle <alexandre.fayolle@logilab.fr>
Wed, 02 Jun 2010 16:12:18 +0000
branchstable
changeset 5639 4acb860159e4
parent 5424 8ecbcbff9777
child 5556 9ab2b4c74baf
permissions -rw-r--r--
[win32] fix deadlock occuring on the sequence tables with SQLServer actually, this deadlock would occur with any db backend other that PostgreSQL as the previous code was heavily relying on PG's SEQUENCE facility, not available elsewhere. Deadlock description: Thread1 starts creating entities (and therefore calls create_eid): -> this creates a DB-level lock on the entities_id_seq table, which will last until end of transaction Thread2 calls create_eid, which acquires the Python lock object, but updating the entities_id_seq is held by the DB lock Thread1 wants to create a new entity, calls create_eid, and is stuck by the Python lock object held by Thread2. Solution: use a separate connection to read and write the entities_id_seq table.
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# copyright 2003-2010 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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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""mixins of entity/views organized somewhat in a graph or tree structure"""
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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 implementing 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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0
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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])
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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"""
0
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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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            }
0
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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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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'<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)
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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 a default implementations for IProgress interface methods"""
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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