73f798da57
* New method type: extension methods. Extension methods enable you to "add" methods to existing types without modifying the original type. Extension methods are a special kind of static method, but they are called as if they were instance methods on the extended type. Extension methods are identified by "Usage: Extension" and the type they extend is determined by their first argument contract. Thus such methods must have at lease one parameter. * New type-level keyword "Import" which can be either list or scalar that specifies type names which extensions methods should be imported into class context and thus become available to type members. Change-Id: If757327857376ac66784acd4bd29471e6f28b612
279 lines
11 KiB
Python
279 lines
11 KiB
Python
# Copyright (c) 2014 Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import weakref
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import six
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from murano.dsl import constants
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from murano.dsl import dsl
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from murano.dsl import dsl_types
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from murano.dsl import exceptions
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from murano.dsl import helpers
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from murano.dsl import yaql_integration
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class MuranoObject(dsl_types.MuranoObject):
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def __init__(self, murano_class, owner, object_store, executor,
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object_id=None, name=None, known_classes=None, this=None):
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if known_classes is None:
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known_classes = {}
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self.__owner = owner.real_this if owner else None
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self.__object_id = object_id or helpers.generate_id()
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self.__type = murano_class
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self.__properties = {}
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self.__parents = {}
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self.__this = this
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self.__name = name
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self.__extension = None
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self.__object_store = \
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None if object_store is None else weakref.ref(object_store)
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self.__executor = weakref.ref(executor)
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self.__config = murano_class.package.get_class_config(
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murano_class.name)
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if not isinstance(self.__config, dict):
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self.__config = {}
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known_classes[murano_class.name] = self
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for parent_class in murano_class.parents(self.real_this.type):
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name = parent_class.name
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if name not in known_classes:
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obj = parent_class.new(
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owner, object_store, executor, object_id=self.__object_id,
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known_classes=known_classes, this=self.real_this).object
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self.__parents[name] = known_classes[name] = obj
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else:
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self.__parents[name] = known_classes[name]
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self.__initialized = False
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@property
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def extension(self):
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return self.__extension
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@property
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def name(self):
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return self.real_this.__name
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@extension.setter
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def extension(self, value):
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self.__extension = value
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@property
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def object_store(self):
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return None if self.__object_store is None else self.__object_store()
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@property
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def executor(self):
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return self.__executor()
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def initialize(self, context, object_store, params):
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if self.__initialized:
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return
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for property_name in self.__type.properties:
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spec = self.__type.properties[property_name]
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if spec.usage == dsl_types.PropertyUsages.Config:
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if property_name in self.__config:
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property_value = self.__config[property_name]
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else:
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property_value = dsl.NO_VALUE
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self.set_property(property_name, property_value)
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init = self.type.methods.get('.init')
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used_names = set()
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names = set(self.__type.properties)
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if init:
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names.update(six.iterkeys(init.arguments_scheme))
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last_errors = len(names)
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init_args = {}
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while True:
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errors = 0
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for property_name in names:
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if init and property_name in init.arguments_scheme:
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spec = init.arguments_scheme[property_name]
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is_init_arg = True
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else:
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spec = self.__type.properties[property_name]
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is_init_arg = False
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if property_name in used_names:
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continue
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if spec.usage in (dsl_types.PropertyUsages.Config,
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dsl_types.PropertyUsages.Static):
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used_names.add(property_name)
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continue
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if spec.usage == dsl_types.PropertyUsages.Runtime:
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if not spec.has_default:
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used_names.add(property_name)
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continue
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property_value = dsl.NO_VALUE
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else:
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property_value = params.get(property_name, dsl.NO_VALUE)
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try:
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if is_init_arg:
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init_args[property_name] = property_value
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else:
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self.set_property(
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property_name, property_value, context)
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used_names.add(property_name)
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except exceptions.UninitializedPropertyAccessError:
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errors += 1
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except exceptions.ContractViolationException:
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if spec.usage != dsl_types.PropertyUsages.Runtime:
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raise
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if not errors:
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break
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if errors >= last_errors:
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raise exceptions.CircularExpressionDependenciesError()
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last_errors = errors
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executor = helpers.get_executor(context)
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if ((object_store is None or not object_store.initializing) and
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self.__extension is None):
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method = self.type.methods.get('__init__')
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if method:
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filtered_params = yaql_integration.filter_parameters(
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method.body, **params)
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self.__extension = method.invoke(
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executor, self, filtered_params[0],
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filtered_params[1], context)
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for parent in self.__parents.values():
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parent.initialize(context, object_store, params)
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if (object_store is None or not object_store.initializing) and init:
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context[constants.CTX_ARGUMENT_OWNER] = self.real_this
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init.invoke(executor, self.real_this, (), init_args, context)
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self.__initialized = True
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@property
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def object_id(self):
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return self.__object_id
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@property
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def type(self):
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return self.__type
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@property
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def owner(self):
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return self.__owner
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@property
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def real_this(self):
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return self.__this or self
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def get_property(self, name, context=None):
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start_type, derived = self.__type, False
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caller_class = None if not context else helpers.get_type(context)
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if caller_class is not None and caller_class.is_compatible(self):
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start_type, derived = caller_class, True
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if name in start_type.properties:
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spec = start_type.properties[name]
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if spec.usage == dsl_types.PropertyUsages.Static:
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return spec.declaring_type.get_property(name, context)
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else:
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return self.cast(start_type)._get_property_value(name)
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else:
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try:
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spec = start_type.find_single_property(name)
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if spec.usage == dsl_types.PropertyUsages.Static:
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return spec.declaring_type.get_property(name, context)
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else:
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return self.cast(spec.declaring_type).__properties[name]
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except exceptions.NoPropertyFound:
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if derived:
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return self.cast(caller_class)._get_property_value(name)
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else:
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raise exceptions.PropertyReadError(name, start_type)
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def _get_property_value(self, name):
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try:
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return self.__properties[name]
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except KeyError:
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raise exceptions.UninitializedPropertyAccessError(
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name, self.__type)
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def set_property(self, name, value, context=None):
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start_type, derived = self.__type, False
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caller_class = None if not context else helpers.get_type(context)
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if caller_class is not None and caller_class.is_compatible(self):
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start_type, derived = caller_class, True
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declared_properties = start_type.find_properties(
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lambda p: p.name == name)
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if context is None:
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context = self.executor.create_object_context(self)
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if len(declared_properties) > 0:
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declared_properties = self.type.find_properties(
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lambda p: p.name == name)
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values_to_assign = []
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classes_for_static_properties = []
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for spec in declared_properties:
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if (caller_class is not None and not
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helpers.are_property_modifications_allowed(context) and
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(spec.usage not in dsl_types.PropertyUsages.Writable or
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not derived)):
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raise exceptions.NoWriteAccessError(name)
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if spec.usage == dsl_types.PropertyUsages.Static:
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classes_for_static_properties.append(spec.declaring_type)
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else:
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default = self.__config.get(name, spec.default)
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# default = helpers.evaluate(default, context)
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obj = self.cast(spec.declaring_type)
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values_to_assign.append((obj, spec.transform(
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value, self.real_this,
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self.real_this, context, default=default)))
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for obj, value in values_to_assign:
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obj.__properties[name] = value
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for cls in classes_for_static_properties:
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cls.set_property(name, value, context)
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elif derived:
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obj = self.cast(caller_class)
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obj.__properties[name] = value
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else:
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raise exceptions.PropertyWriteError(name, start_type)
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def cast(self, cls):
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for p in helpers.traverse(self, lambda t: t.__parents.values()):
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if p.type is cls:
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return p
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raise TypeError('Cannot cast {0} to {1}'.format(self.type, cls))
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def __repr__(self):
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return '<{0}/{1} {2} ({3})>'.format(
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self.type.name, self.type.version, self.object_id, id(self))
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def to_dictionary(self, include_hidden=False):
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result = {}
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for parent in self.__parents.values():
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result.update(parent.to_dictionary(include_hidden))
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result.update({'?': {
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'type': self.type.name,
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'id': self.object_id,
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'name': self.name,
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'classVersion': str(self.type.version),
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'package': self.type.package.name
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}})
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if include_hidden:
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result.update(self.__properties)
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else:
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for property_name in self.type.properties:
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if property_name in self.__properties:
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spec = self.type.properties[property_name]
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if spec.usage != dsl_types.PropertyUsages.Runtime:
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result[property_name] = self.__properties[
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property_name]
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return result
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