16030aeec8
This commit reworks mechanism how context chain is built at each point. The goal was to make entire chain be dependent on format version number. This would allow for example to use yaql 1.0 legacy mode context for MuranoPL/1.0 and not to use it for 2.0. Not the entire chain is built on demand up to the root instead of attaching to existed parent context as it was before. DSL host (engine) is no more required to have custom MuranoDslExecutor implementation but a new ContextManager interface that is used to control contexts on each layer. Engine uses this interface to register system classes and engine level yaql functions. Also a ContextManager is a foundation for method mocking because now all MuranoPL methods are yaql functions stored in context and with ContextManager it is possible to inject/replace function in each scope ( global, package, class, object) Partially implements: blueprint murano-versioning Change-Id: I0a553e8044061fe780a83bc04d70b8f80580988f
257 lines
9.9 KiB
Python
257 lines
9.9 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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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, object_store, 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.__object_store = weakref.ref(object_store)
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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, object_id=self.__object_id,
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known_classes=known_classes, defaults=defaults,
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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 self.__object_store()
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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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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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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 context is None:
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context = self.object_store.executor.create_object_context(self)
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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)
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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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