def _build_parent_remappings(self):
"""Remaps class parents.
In case of multiple inheritance class may indirectly get several
versions of the same class. It is reasonable to try to replace them
with single version to avoid conflicts. We can do that when within
versions that satisfy our class package requirements.
But in order to merge several classes that are not our parents but
grand parents we will need to modify classes that may be used
somewhere else (with another set of requirements). We cannot do this.
So instead we build translation table that will tell which ancestor
class need to be replaced with which so that we minimize number of
versions used for single class (or technically packages since version
is a package attribute). For translation table to work there should
be a method that returns all class virtual ancestors so that everybody
will see them instead of accessing class parents directly and getting
declared ancestors.
"""
result = {}
aggregation = {
self.package.name: {(
self.package,
semantic_version.Spec('==' + str(self.package.version))
)}
}
for cls, parent in helpers.traverse(
((self, parent) for parent in self._parents),
lambda (c, p): ((p, anc) for anc in p.declared_parents)):
if cls.package != parent.package:
requirement = cls.package.requirements[parent.package.name]
aggregation.setdefault(parent.package.name, set()).add(
(parent.package, requirement))
def _build_parent_remappings(self):
"""Remaps class parents.
In case of multiple inheritance class may indirectly get several
versions of the same class. It is reasonable to try to replace them
with single version to avoid conflicts. We can do that when within
versions that satisfy our class package requirements.
But in order to merge several classes that are not our parents but
grand parents we will need to modify classes that may be used
somewhere else (with another set of requirements). We cannot do this.
So instead we build translation table that will tell which ancestor
class need to be replaced with which so that we minimize number of
versions used for single class (or technically packages since version
is a package attribute). For translation table to work there should
be a method that returns all class virtual ancestors so that everybody
will see them instead of accessing class parents directly and getting
declared ancestors.
"""
result = {}
aggregation = {
self.package.name: {(
self.package,
semantic_version.Spec('==' + str(self.package.version))
)}
}
for cls, parent in helpers.traverse(
((self, parent) for parent in self._parents),
lambda cp: ((cp[1], anc) for anc in cp[1].declared_parents)):
if cls.package != parent.package:
requirement = cls.package.requirements[parent.package.name]
aggregation.setdefault(parent.package.name, set()).add(
(parent.package, requirement))
package_bindings = {}
for versions in six.itervalues(aggregation):
mappings = self._remap_package(versions)
package_bindings.update(mappings)
for cls in helpers.traverse(
self.declared_parents, lambda c: c.declared_parents):
if cls.package in package_bindings:
package2 = package_bindings[cls.package]
cls2 = package2.classes[cls.name]
result[cls] = cls2
return result
def weigh_type_hierarchy(cls):
"""Weighs classes in type hierarchy by their distance from the root
:param cls: root of hierarchy
:return: dictionary that has class name as keys and distance from the root
a values. Root class has always a distance of 0. If the class
(or different versions of that class) is achievable through
several paths the shortest distance is used.
"""
result = {}
for c, w in helpers.traverse(
[(cls, 0)], lambda t: six.moves.map(
lambda p: (p, t[1] + 1), t[0].parents)):
result.setdefault(c.name, w)
return result
def find_single_property(self, name):
result = None
parents = None
gen = helpers.traverse(self)
while True:
try:
mc = gen.send(parents)
if name in mc.properties:
if result and result != mc:
raise exceptions.AmbiguousPropertyNameError(name)
result = mc
parents = []
else:
parents = mc.parents(self)
except StopIteration:
return result
def find_single_property(self, name):
result = None
parents = None
gen = helpers.traverse(self)
while True:
try:
mc = gen.send(parents)
if name in mc.properties:
if result and result != mc:
raise exceptions.AmbiguousPropertyNameError(name)
result = mc
parents = []
else:
parents = mc.parents(self)
except StopIteration:
return result
def cast(self, cls):
for p in helpers.traverse(self, lambda t: t.__parents.values()):
if p.type is cls:
return p
raise TypeError('Cannot cast {0} to {1}'.format(self.type, cls))
def ancestors(self):
for c in helpers.traverse(self, lambda t: t.parents):
if c is not self:
yield c
def ancestors(self):
for c in helpers.traverse(self, lambda t: t.parents(self)):
yield c
def ancestors(self):
return helpers.traverse(self, lambda t: t.declared_parents)
def ancestors(self):
return helpers.traverse(self, lambda t: t.declared_parents)
def _list_properties(self, name):
for p in helpers.traverse(self.real_this,
lambda t: t._parents.values()):
if name in p.type.properties:
yield p.type.properties[name]
def cast(self, cls):
for p in helpers.traverse(self, lambda t: t._parents.values()):
if p.type == cls:
return p
raise TypeError('Cannot cast {0} to {1}'.format(self.type, cls))
def ancestors(self):
for c in helpers.traverse(self, lambda t: t.parents(self)):
yield c
class MuranoClass(dsl_types.MuranoClass):
def __init__(self, ns_resolver, name, package, parents=None):
self._package = weakref.ref(package)
self._methods = {}
self._namespace_resolver = ns_resolver
self._name = name
self._properties = {}
self._config = {}
if self._name == constants.CORE_LIBRARY_OBJECT:
self._parents = []
else:
self._parents = parents or [
package.find_class(constants.CORE_LIBRARY_OBJECT)
]
self._context = None
self._parent_mappings = self._build_parent_remappings()
@classmethod
def create(cls, data, package, name=None):
namespaces = data.get('Namespaces') or {}
ns_resolver = namespace_resolver.NamespaceResolver(namespaces)
if not name:
name = ns_resolver.resolve_name(data['Name'])
parent_class_names = data.get('Extends')
parent_classes = []
if parent_class_names:
if not utils.is_sequence(parent_class_names):
parent_class_names = [parent_class_names]
for parent_name in parent_class_names:
full_name = ns_resolver.resolve_name(parent_name)
parent_classes.append(package.find_class(full_name))
type_obj = cls(ns_resolver, name, package, parent_classes)
properties = data.get('Properties') or {}
for property_name, property_spec in properties.iteritems():
spec = typespec.PropertySpec(property_spec, type_obj)
type_obj.add_property(property_name, spec)
methods = data.get('Methods') or data.get('Workflow') or {}
method_mappings = {'initialize': '.init', 'destroy': '.destroy'}
for method_name, payload in methods.iteritems():
type_obj.add_method(method_mappings.get(method_name, method_name),
payload)
return type_obj
@property
def name(self):
return self._name
@property
def package(self):
return self._package()
@property
def namespace_resolver(self):
return self._namespace_resolver
@property
def declared_parents(self):
return self._parents
@property
def methods(self):
return self._methods
@property
def parent_mappings(self):
return self._parent_mappings
def extend_with_class(self, cls):
ctor = yaql_integration.get_class_factory_definition(cls, self)
self.add_method('__init__', ctor)
def get_method(self, name):
return self._methods.get(name)
def add_method(self, name, payload):
method = murano_method.MuranoMethod(self, name, payload)
self._methods[name] = method
self._context = None
return method
@property
def properties(self):
return self._properties.keys()
def add_property(self, name, property_typespec):
if not isinstance(property_typespec, typespec.PropertySpec):
raise TypeError('property_typespec')
self._properties[name] = property_typespec
def get_property(self, name):
return self._properties[name]
def _find_method_chains(self, name, origin):
queue = collections.deque([(self, ())])
while queue:
cls, path = queue.popleft()
segment = (cls.methods[name], ) if name in cls.methods else ()
leaf = True
for p in cls.parents(origin):
leaf = False
queue.append((p, path + segment))
if leaf:
path = path + segment
if path:
yield path
def find_single_method(self, name):
chains = sorted(self._find_method_chains(name, self),
key=lambda t: len(t))
result = []
for i in range(len(chains)):
if chains[i][0] in result:
continue
add = True
for j in range(i + 1, len(chains)):
common = 0
if not add:
break
for p in range(len(chains[i])):
if chains[i][-p - 1] is chains[j][-p - 1]:
common += 1
else:
break
if common == len(chains[i]):
add = False
break
if add:
result.append(chains[i][0])
if len(result) < 1:
raise exceptions.NoMethodFound(name)
elif len(result) > 1:
raise exceptions.AmbiguousMethodName(name)
return result[0]
def find_methods(self, predicate):
result = []
for c in self.ancestors():
for method in c.methods.itervalues():
if predicate(method) and method not in result:
result.append(method)
return result
def _iterate_unique_methods(self):
names = set()
for c in self.ancestors():
names.update(c.methods.keys())
for name in names:
try:
yield self.find_single_method(name)
except exceptions.AmbiguousMethodName as e:
def func(*args, **kwargs):
raise e
yield murano_method.MuranoMethod(self, name, func)
def find_property(self, name):
result = []
for mc in self.ancestors():
if name in mc.properties and mc not in result:
result.append(mc)
return result
def find_single_property(self, name):
result = None
parents = None
gen = helpers.traverse(self)
while True:
try:
mc = gen.send(parents)
if name in mc.properties:
if result and result != mc:
raise exceptions.AmbiguousPropertyNameError(name)
result = mc
parents = []
else:
parents = mc.parents(self)
except StopIteration:
return result
def invoke(self, name, executor, this, args, kwargs, context=None):
method = self.find_single_method(name)
return method.invoke(executor, this, args, kwargs, context)
def is_compatible(self, obj):
if isinstance(obj,
(murano_object.MuranoObject, dsl.MuranoObjectInterface)):
obj = obj.type
return any(cls is self for cls in obj.ancestors())
def new(self, owner, object_store, **kwargs):
obj = murano_object.MuranoObject(self, owner, object_store, **kwargs)
def initializer(__context, **params):
if __context is None:
__context = object_store.executor.create_object_context(obj)
init_context = __context.create_child_context()
init_context[constants.CTX_ALLOW_PROPERTY_WRITES] = True
obj.initialize(init_context, object_store, params)
return obj
initializer.object = obj
return initializer
def __repr__(self):
return 'MuranoClass({0}/{1})'.format(self.name, self.version)
@property
def version(self):
return self.package.version
def _build_parent_remappings(self):
"""Remaps class parents.
In case of multiple inheritance class may indirectly get several
versions of the same class. It is reasonable to try to replace them
with single version to avoid conflicts. We can do that when within
versions that satisfy our class package requirements.
But in order to merge several classes that are not our parents but
grand parents we will need to modify classes that may be used
somewhere else (with another set of requirements). We cannot do this.
So instead we build translation table that will tell which ancestor
class need to be replaced with which so that we minimize number of
versions used for single class (or technically packages since version
is a package attribute). For translation table to work there should
be a method that returns all class virtual ancestors so that everybody
will see them instead of accessing class parents directly and getting
declared ancestors.
"""
result = {}
aggregation = {
self.package.name:
{(self.package,
semantic_version.Spec('==' + str(self.package.version)))}
}
for cls, parent in helpers.traverse(
((self, parent) for parent in self._parents), lambda (c, p): (
(p, anc) for anc in p.declared_parents)):
if cls.package != parent.package:
requirement = cls.package.requirements[parent.package.name]
aggregation.setdefault(parent.package.name, set()).add(
(parent.package, requirement))
package_bindings = {}
for versions in aggregation.itervalues():
mappings = self._remap_package(versions)
package_bindings.update(mappings)
for cls in helpers.traverse(self.declared_parents,
lambda c: c.declared_parents):
if cls.package in package_bindings:
package2 = package_bindings[cls.package]
cls2 = package2.classes[cls.name]
result[cls] = cls2
return result