068831ccd8
With this change MuranoPackage becomes first-class DSL citizen. Packages have version, runtime_version (that is specified in Format attribute of the manifest file) and a list of classes. Previously engine used to have package loader which had most of "load" functionality and class loader that mostly acted as an adapter from package loader to interface that DSL used to get classes. Now class loader is gone and is replaced with package loader at the DSL level. Package loader is responsible for loading packages by either package or class name (as it was before) plus semantic_version spec (for example ">=1.2,<2.0"). Package loader can now keep track of several versions of the same package. Also packages now have requirements with version specs. All class names that are encountered in application code are looked up within requirements only. As a consequence packages that use other packages without referencing them explicitly will become broken. An exception from this rule is core library which is referenced automatically. Partially implements: blueprint murano-versioning Change-Id: I8789ba45b6210e71bf4977a766f82b66d2a2d270
264 lines
10 KiB
Python
264 lines
10 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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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 typespec
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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, context, object_id=None,
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name=None, known_classes=None, defaults=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.__defaults = defaults or {}
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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.__context = self.__setup_context(context)
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object_store = helpers.get_object_store(context)
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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, context,
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object_id=self.__object_id,
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known_classes=known_classes,
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defaults=defaults, 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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def __setup_context(self, context):
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context = context.create_child_context()
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context[constants.CTX_THIS] = self.real_this
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context[constants.CTX_TYPE] = self.type
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context['this'] = self.real_this
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context[''] = self.real_this
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return context
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@property
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def context(self):
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return self.__context
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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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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.get_property(property_name)
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if spec.usage == typespec.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(init.arguments_scheme.iterkeys())
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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.get_property(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 == typespec.PropertyUsages.Config:
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used_names.add(property_name)
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continue
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if spec.usage == typespec.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(property_name, property_value)
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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 != typespec.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 not object_store.initializing and 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 not object_store.initializing and init:
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init_context = context.create_child_context()
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init_context[constants.CTX_ARGUMENT_OWNER] = self.real_this
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init.invoke(executor, self.real_this, (), init_args, init_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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return self.cast(start_type)._get_property_value(name)
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else:
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declared_properties = start_type.find_single_property(name)
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if declared_properties:
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return self.cast(declared_properties).__properties[name]
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elif 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_property(name)
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if len(declared_properties) > 0:
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declared_properties = self.type.find_property(name)
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values_to_assign = []
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for mc in declared_properties:
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spec = mc.get_property(name)
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if (caller_class is not None and
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not helpers.are_property_modifications_allowed(context)
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and (spec.usage not in typespec.PropertyUsages.Writable
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or not derived)):
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raise exceptions.NoWriteAccessError(name)
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default = self.__config.get(name, spec.default)
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default = self.__defaults.get(name, default)
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default = helpers.evaluate(default, context or self.context)
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obj = self.cast(mc)
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values_to_assign.append((obj, spec.validate(
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value, self.real_this,
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self.real_this, 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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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.get_property(property_name)
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if spec.usage != typespec.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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