def loader_options(self):
"""
Dictionary mapping each entity class to configure a loader for to a
list of (possibly nested) entity attribute names.
"""
all_keys = set(self.__attr_map.keys())
# Go through the collected keys and through out all keys which are
# subkeys of others to eliminate redundancy.
for key in sorted(self.__attr_map):
for idx in range(1, len(key)):
sub_key = key[:-idx]
if sub_key in all_keys:
all_keys.remove(sub_key)
if provides_member_resource(self._context):
# If the context is a member, we need to configure the loaders
# for the entity class belonging to each of its resource
# attributes. Only nested keys collected from the representer
# configuration need to be configured (and the corresponding
# nested entity attribute needs to be shortened).
loader_option_map = defaultdict(list)
for key in all_keys:
entity_attr_names = self.__attr_map[key]
if len(entity_attr_names) > 1:
ent_attr_name = entity_attr_names[0]
nested_attr_name = '.'.join(entity_attr_names[1:])
opts = loader_option_map[ent_attr_name]
opts.append(nested_attr_name)
# Translate to entity classes as keys. This is tricky as the
# keys in the loader option map can itself be nested attributes.
for ent_attr_name, nested_attr_names in loader_option_map.items():
ent_attr_name_tokens = ent_attr_name.split('.')
ent_cls = get_entity_class(self._context)
ent_cls_attr = getattr(ent_cls, ent_attr_name_tokens[0])
ent_cls = ent_cls_attr.property.mapper.entity
if len(ent_attr_name_tokens) > 1:
prefix = '.'.join(ent_attr_name_tokens[1:])
loader_option_map[ent_cls] = \
["%s.%s" % (prefix, token)
for token in nested_attr_names]
else:
loader_option_map[ent_cls] = nested_attr_names
del loader_option_map[ent_attr_name]
else:
# If the context is a collection, we need to configure the
# loader for its entity class.
loader_option_map = {get_entity_class(self._context) :
['.'.join(self.__attr_map[key])
for key in all_keys]}
return loader_option_map
def visit_member(self, attribute_key, attribute, member_node, member_data,
is_link_node, parent_data, index=None):
if is_link_node:
url = member_node.get_url()
rc = url_to_resource(url)
entity = rc.get_entity()
else:
entity_cls = get_entity_class(member_node.mapping.mapped_class)
entity_data = {}
nested_entity_data = {}
for attr, value in member_data.iteritems():
if '.' in attr.entity_name:
nested_entity_data[attr.entity_name] = value
else:
entity_data[attr.entity_name] = value
entity = entity_cls.create_from_data(entity_data)
# Set nested attribute values.
# FIXME: lazy loading of nested attributes is not supported.
for nested_attr, value in nested_entity_data.iteritems():
tokens = nested_attr.split('.')
parent = reduce(getattr, tokens[:-1], entity)
if not parent is None:
setattr(parent, tokens[-1], value)
if not index is None:
# Collection member. Store in parent data with index as key.
parent_data[index] = entity
elif len(attribute_key) == 0:
# Top level. Store root entity and create resource.
mapped_cls = member_node.mapping.mapped_class
self.__resource = mapped_cls.create_from_entity(entity)
else:
# Nested member. Store in parent data with attribute as key.
parent_data[attribute] = entity
def inspect(entity_class, attribute_name):
attr_tokens = attribute_name.split('.')
infos = []
for idx, attr_token in enumerate(attr_tokens):
do_append = True
try:
attr = get_domain_class_attributes(entity_class)[attr_token]
except KeyError:
if attr_token != 'slug':
# If we encounter a non-resource attribute, we assume
# an embedded document (which implies that the last
# token was a terminal).
infos[-1][-1] = \
'.'.join([infos[-1][-1]] + attr_tokens[idx:])
# Unfortunately, we can not infer the type of embedded
# attributes.
infos[-1][1] = None
do_append = False
else:
# The 'slug' attribute is special as it is not a properly
# declared resource attribute but needs to be queryable.
attr_kind = RESOURCE_ATTRIBUTE_KINDS.TERMINAL
attr_type = str
else:
attr_kind = attr.kind
if attr_kind != RESOURCE_ATTRIBUTE_KINDS.TERMINAL:
entity_class = get_entity_class(attr.attr_type)
attr_type = entity_class
else:
attr_type = attr.attr_type
if do_append:
infos.append([attr_kind, attr_type, attr_token])
return infos
def __clone(self, entity, cache):
clone = object.__new__(entity.__class__)
# We add the clone with its ID set to the cache *before* we load it
# so that circular references will work.
clone.id = entity.id
cache.add(clone)
state = EntityState.get_state_data(entity)
id_attr = None
for attr, value in iteritems_(state):
if attr.entity_attr == 'id':
id_attr = attr
continue
attr_type = attr.attr_type
if attr.kind != RESOURCE_ATTRIBUTE_KINDS.TERMINAL \
and not self.__repository.is_registered_resource(attr_type):
# Prevent loading of entities from other repositories.
# FIXME: Doing this here is inconsistent, since e.g. the RDB
# session does not perform this kind of check.
continue
elif attr.kind == RESOURCE_ATTRIBUTE_KINDS.MEMBER \
and not value is None:
ent_cls = get_entity_class(attr_type)
new_value = self.load(ent_cls, value)
state[attr] = new_value
elif attr.kind == RESOURCE_ATTRIBUTE_KINDS.COLLECTION \
and len(value) > 0:
value_type = type(value)
new_value = value_type.__new__(value_type)
if issubclass(value_type, MutableSequence):
add_op = new_value.append
elif issubclass(value_type, MutableSet):
add_op = new_value.add
else:
raise ValueError('Do not know how to clone value of type '
'%s for resource attribute %s.' %
(type(new_value), attr))
ent_cls = get_entity_class(attr_type)
for child in value:
child_clone = self.load(ent_cls, child)
add_op(child_clone)
state[attr] = new_value
# We set the ID already above.
if not id_attr is None:
del state[id_attr]
EntityState.set_state_data(clone, state)
return clone
def __clone(self, entity, cache):
clone = object.__new__(entity.__class__)
# We add the clone with its ID set to the cache *before* we load it
# so that circular references will work.
clone.id = entity.id
cache.add(clone)
state = EntityState.get_state_data(entity)
id_attr = None
for attr, value in iteritems_(state):
if attr.entity_attr == 'id':
id_attr = attr
continue
attr_type = attr.attr_type
if attr.kind != RESOURCE_ATTRIBUTE_KINDS.TERMINAL \
and not self.__repository.is_registered_resource(attr_type):
# Prevent loading of entities from other repositories.
# FIXME: Doing this here is inconsistent, since e.g. the RDB
# session does not perform this kind of check.
continue
elif attr.kind == RESOURCE_ATTRIBUTE_KINDS.MEMBER \
and not value is None:
ent_cls = get_entity_class(attr_type)
new_value = self.load(ent_cls, value)
state[attr] = new_value
elif attr.kind == RESOURCE_ATTRIBUTE_KINDS.COLLECTION \
and len(value) > 0:
value_type = type(value)
new_value = value_type.__new__(value_type)
if issubclass(value_type, MutableSequence):
add_op = new_value.append
elif issubclass(value_type, MutableSet):
add_op = new_value.add
else:
raise ValueError('Do not know how to clone value of type '
'%s for resource attribute %s.'
% (type(new_value), attr))
ent_cls = get_entity_class(attr_type)
for child in value:
child_clone = self.load(ent_cls, child)
add_op(child_clone)
state[attr] = new_value
# We set the ID already above.
if not id_attr is None:
del state[id_attr]
EntityState.set_state_data(clone, state)
return clone
def __collect(self, resource):
ent_cls = get_entity_class(resource)
coll_cls = get_collection_class(resource)
cache = EntityCacheMap()
agg = StagingAggregate(ent_cls, cache)
coll = coll_cls.create_from_aggregate(agg)
coll.add(resource)
return dict([(get_member_class(ent_cls),
coll.get_root_collection(ent_cls))
for ent_cls in cache.keys()])
def __collect(self, resource):
ent_cls = get_entity_class(resource)
coll_cls = get_collection_class(resource)
cache = EntityCacheMap()
agg = StagingAggregate(ent_cls, cache)
coll = coll_cls.create_from_aggregate(agg)
coll.add(resource)
return dict([(get_member_class(ent_cls),
coll.get_root_collection(ent_cls))
for ent_cls in cache.keys()])
def create_staging_collection(resource):
"""
Helper function to create a staging collection for the given registered
resource.
:param resource: registered resource
:type resource: class implementing or instance providing or subclass of
a registered resource interface.
"""
ent_cls = get_entity_class(resource)
coll_cls = get_collection_class(resource)
agg = StagingAggregate(ent_cls)
return coll_cls.create_from_aggregate(agg)
def create_staging_collection(resource):
"""
Helper function to create a staging collection for the given registered
resource.
:param resource: registered resource
:type resource: class implementing or instance providing or subclass of
a registered resource interface.
"""
ent_cls = get_entity_class(resource)
coll_cls = get_collection_class(resource)
agg = StagingAggregate(ent_cls)
return coll_cls.create_from_aggregate(agg)
def set_collection_parent(self, resource, parent):
"""
Sets the parent of the specified root collection to the given
object (typically a service object).
:param resource: Registered resource.
:raises ValueError: If no root collection has been created for the
given registered resource.
"""
ent_cls = get_entity_class(resource)
root_coll = self.__cache.get(ent_cls)
if root_coll is None:
raise ValueError('No root collection available for resource.')
root_coll.__parent__ = parent
def get_collection(self, resource):
if not self.__is_initialized:
raise RuntimeError('Repository needs to be initialized.')
ent_cls = get_entity_class(resource)
root_coll = self.__cache.get(ent_cls)
if root_coll is None:
# Create a new root aggregate.
root_agg = self.__agg_cls.create(ent_cls, self.session_factory,
self)
# Create a new root collection.
coll_cls = get_collection_class(resource)
root_coll = coll_cls.create_from_aggregate(root_agg)
self.__cache[ent_cls] = root_coll
return root_coll.clone()
def set_collection_parent(self, resource, parent):
"""
Sets the parent of the specified root collection to the given
object (typically a service object).
:param resource: Registered resource.
:raises ValueError: If no root collection has been created for the
given registered resource.
"""
ent_cls = get_entity_class(resource)
root_coll = self.__cache.get(ent_cls)
if root_coll is None:
raise ValueError('No root collection available for resource.')
root_coll.__parent__ = parent
def get_collection(self, resource):
if not self.__is_initialized:
raise RuntimeError('Repository needs to be initialized.')
ent_cls = get_entity_class(resource)
root_coll = self.__cache.get(ent_cls)
if root_coll is None:
# Create a new root aggregate.
root_agg = self.__agg_cls.create(ent_cls, self.session_factory,
self)
# Create a new root collection.
coll_cls = get_collection_class(resource)
root_coll = coll_cls.create_from_aggregate(root_agg)
self.__cache[ent_cls] = root_coll
return root_coll.clone()
def __get__(self, entity, entity_class):
if not entity is None:
ref_val = entity.__mongo_refs__[self.__attr.entity_attr]
attr_entity_class = get_entity_class(self.__attr.attr_type)
if isinstance(ref_val, list):
# FIXME: Assuming list here.
value = [transform_outgoing(attr_entity_class,
self.__db.dereference(el))
for el in ref_val]
else:
value = transform_outgoing(attr_entity_class,
self.__db.dereference(ref_val))
setattr(entity, self.__attr.entity_attr, value)
else:
value = self
return value
def __load_entities(self, entity_class, is_top_level):
# Check if we have an entity loader configured.
loader = self.configuration['cache_loader']
if not loader is None:
cache = self.__cache_map[entity_class]
for ent in loader(entity_class):
if ent.id is None:
ent.id = new_entity_id()
cache.add(ent)
# To fully initialize the cache, we also need to load collections
# that are not linked to from any of the entities just loaded.
if is_top_level:
for reg_rc in self.registered_resources:
reg_ent_cls = get_entity_class(reg_rc)
if not reg_ent_cls in self.__cache_map:
self.__load_entities(reg_ent_cls, False)
def _initialize(self):
if not is_engine_initialized(self.name):
engine = self.__make_engine()
set_engine(self.name, engine)
else:
engine = get_engine(self.name)
db_name = self._config['db_name']
self.__db = operator.getitem(engine, db_name)
if db_name == 'test':
# Reset the test database.
for coll_name in \
self.__db.collection_names(include_system_collections=False):
self.__db.drop_collection(coll_name)
# Set up the class registry.
for rc in self.registered_resources:
ent_cls = get_entity_class(rc)
if not MongoClassRegistry.is_registered(ent_cls):
MongoClassRegistry.register(ent_cls, self.__db)
def get_collection(self, resource):
"""
Get a clone of the root collection for the given registered resource.
:param resource: Registered resource.
:raises RuntimeError: If the repository has not been initialized yet.
"""
if not self.__is_initialized:
raise RuntimeError('Repository needs to be initialized.')
ent_cls = get_entity_class(resource)
root_coll = self.__cache.get(ent_cls)
if root_coll is None:
coll_cls = get_collection_class(resource)
agg = self.__agg_cls.create(ent_cls, self.session_factory)
root_coll = coll_cls.create_from_aggregate(agg)
self.__cache[ent_cls] = root_coll
clone = root_coll.clone()
clone.__repository__ = self
return clone
def get_collection(self, resource):
"""
Get a clone of the root collection for the given registered resource.
:param resource: Registered resource.
:raises RuntimeError: If the repository has not been initialized yet.
"""
if not self.__is_initialized:
raise RuntimeError('Repository needs to be initialized.')
ent_cls = get_entity_class(resource)
root_coll = self.__cache.get(ent_cls)
if root_coll is None:
coll_cls = get_collection_class(resource)
agg = self.__agg_cls.create(ent_cls, self.session_factory)
root_coll = coll_cls.create_from_aggregate(agg)
self.__cache[ent_cls] = root_coll
clone = root_coll.clone()
clone.__repository__ = self
return clone
def __init__(self, entity, name=None, relationship=None):
"""
Constructor:
:param str name: Unique name of the member within the collection
:param entity: Associated entity (domain object).
:type entity: Object implementing an interface derived from
:class:`everest.entities.interfaces.IEntity`.
"""
if self.__class__ is Member:
raise NotImplementedError('Abstract class')
if not isinstance(entity, get_entity_class(self)):
raise ValueError(
'Invalid entity class "%s" for %s resource class.'
% (entity.__class__.__name__, self.__class__.__name__))
super(Member, self).__init__(relationship=relationship)
self.__entity = entity
self.__name = name
# Add the rel="self" link.
self.add_link(Link(self, "self"))
def __init__(self, entity, name=None, relationship=None):
"""
Constructor:
:param str name: Unique name of the member within the collection
:param entity: Associated entity (domain object).
:type entity: Object implementing an interface derived from
:class:`everest.entities.interfaces.IEntity`.
"""
if self.__class__ is Member:
raise NotImplementedError('Abstract class')
if not isinstance(entity, get_entity_class(self)):
raise ValueError(
'Invalid entity class "%s" for %s resource class.' %
(entity.__class__.__name__, self.__class__.__name__))
super(Member, self).__init__(relationship=relationship)
self.__entity = entity
self.__name = name
# Add the rel="self" link.
self.add_link(Link(self, "self"))
def visit_member(self,
attribute_key,
attribute,
member_node,
member_data,
is_link_node,
parent_data,
index=None):
if is_link_node:
url = member_node.get_url()
rc = url_to_resource(url)
entity = rc.get_entity()
else:
entity_cls = get_entity_class(member_node.mapping.mapped_class)
entity_data = {}
nested_entity_data = {}
for attr, value in member_data.iteritems():
if '.' in attr.entity_name:
nested_entity_data[attr.entity_name] = value
else:
entity_data[attr.entity_name] = value
entity = entity_cls.create_from_data(entity_data)
# Set nested attribute values.
# FIXME: lazy loading of nested attributes is not supported.
for nested_attr, value in nested_entity_data.iteritems():
tokens = nested_attr.split('.')
parent = reduce(getattr, tokens[:-1], entity)
if not parent is None:
setattr(parent, tokens[-1], value)
if not index is None:
# Collection member. Store in parent data with index as key.
parent_data[index] = entity
elif len(attribute_key) == 0:
# Top level. Store root entity and create resource.
mapped_cls = member_node.mapping.mapped_class
self.__resource = mapped_cls.create_from_entity(entity)
else:
# Nested member. Store in parent data with attribute as key.
parent_data[attribute] = entity
def _convert_to_entity(self):
init_map = {}
nested_map = {}
mapped_class = self._data.mapping.mapped_class
for attr in \
self.__mapping.attribute_iterator(mapped_class=mapped_class,
key=self.__attribute_key):
try:
val = self._get_proxied_attribute_value(attr)
except AttributeError:
continue
else:
attr_name = attr.entity_attr
if not '.' in attr_name:
init_map[attr_name] = val
else:
nested_map[attr_name] = val
ent_cls = get_entity_class(mapped_class)
entity = ent_cls.create_from_data(init_map)
for nested_name, nested_value in iteritems_(nested_map):
set_nested_attribute(entity, nested_name, nested_value)
return entity
def _convert_to_entity(self):
init_map = {}
nested_map = {}
mapped_class = self._data.mapping.mapped_class
for attr in \
self.__mapping.attribute_iterator(mapped_class=mapped_class,
key=self.__attribute_key):
try:
val = self._get_proxied_attribute_value(attr)
except AttributeError:
continue
else:
attr_name = attr.entity_attr
if not '.' in attr_name:
init_map[attr_name] = val
else:
nested_map[attr_name] = val
ent_cls = get_entity_class(mapped_class)
entity = ent_cls.create_from_data(init_map)
for nested_name, nested_value in iteritems_(nested_map):
set_nested_attribute(entity, nested_name, nested_value)
return entity
def visit(self, path, attribute, source, target):
is_root = attribute is None
if is_root:
# Visiting the root.
ent_class = get_entity_class(self._rc_class)
else:
ent_class = get_entity_class(attribute.attr_type)
parent = path.parent
if source is None:
# No source - REMOVE.
entity = target.get_entity()
if not is_root:
rel = self.__get_relationship(parent, attribute)
rel.remove(entity)
if not self.__remove_callback is None:
if self.__pass_path_to_callbacks:
args = (ent_class, entity, path)
else:
args = (ent_class, entity)
cmd = self.RemoveCallback(self.__remove_callback, args)
self.__commands.append(cmd)
else:
if target is None:
# No target - ADD.
entity = source.get_entity()
if not is_root:
if path.relation_operation == RELATION_OPERATIONS.ADD:
# If the parent is created new, the constructor
# will most likely set the child attribute.
add_opts = dict(safe=True)
else:
add_opts = dict()
rel = self.__get_relationship(parent, attribute)
rel.add(entity, **add_opts)
if not self.__add_callback is None:
if self.__pass_path_to_callbacks:
args = (ent_class, entity, path)
else:
args = (ent_class, entity)
cmd = self.AddCallback(self.__add_callback, args)
self.__commands.append(cmd)
else:
# Both source and target - UPDATE.
entity = target.get_entity()
if not self.__update_callback is None:
upd_av_map = dict(source.update_attribute_value_items)
if self.__pass_path_to_callbacks:
args = (ent_class, upd_av_map, entity, path)
else:
args = (ent_class, upd_av_map, entity)
cmd = self.UpdateCallback(self.__update_callback, args)
self.__commands.append(cmd)
if not is_root:
# The relationship with the old value has already been
# severed, so we only need to ADD here.
rel = self.__get_relationship(parent, attribute)
rel.add(entity)
if is_root:
self.root = entity
else:
self.__commands.append(rel)
def _get_entity_type(self):
return get_entity_class(self._data.mapping.mapped_class)
def test_get_entity_class(self):
self.assert_true(get_entity_class(IFoo), FooEntity)
def _get_entity_type(self):
return get_entity_class(self._data.mapping.mapped_class)
def wrap(ent, *args):
if isinstance(ent, type) and IEntity in implemented_by(ent):
ent_cls = ent
else:
ent_cls = get_entity_class(ent)
return func(ent_cls, *args)
def get_root_aggregate(self, rc):
ent_cls = get_entity_class(rc)
return StagingAggregate(ent_cls, cache=self.__cache_map)
def get_root_aggregate(self, rc):
ent_cls = get_entity_class(rc)
return StagingAggregate(ent_cls, cache=self.__cache_map)
def wrap(ent, *args):
if isinstance(ent, type) and IEntity in implemented_by(ent):
ent_cls = ent
else:
ent_cls = get_entity_class(ent)
return func(ent_cls, *args)
def test_get_entity_class(self):
self.assert_true(get_entity_class(IFoo), FooEntity)
