232 lines
6.7 KiB
Python
232 lines
6.7 KiB
Python
# Copyright 2020 Nokia Software.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_config import cfg
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import types
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from mistral_lib import actions as ml_actions
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from mistral_lib import serialization
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from mistral_lib.utils import inspect_utils
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from mistral.db.v2 import api as db_api
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CONF = cfg.CONF
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class DynamicAction(ml_actions.Action):
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def __init__(self, action, code_source_id, namespace=''):
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super(DynamicAction, self).__init__()
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self.action = action
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self.namespace = namespace
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self.code_source_id = code_source_id
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@classmethod
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def get_serialization_key(cls):
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return '%s.%s' % (DynamicAction.__module__, DynamicAction.__name__)
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def run(self, context):
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return self.action.run(context)
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def is_sync(self):
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return self.action.is_sync()
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class DynamicActionDescriptor(ml_actions.PythonActionDescriptor):
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def __init__(self, name, cls_name, action_cls, code_source_id, version,
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action_cls_attrs=None, namespace='', project_id=None,
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scope=None):
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super(DynamicActionDescriptor, self).__init__(
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name,
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action_cls,
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action_cls_attrs,
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namespace,
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project_id,
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scope
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)
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self.cls_name = cls_name
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self.code_source_id = code_source_id
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self.version = version
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def __repr__(self):
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return 'Dynamic action [name=%s, cls=%s , code_source_id=%s,' \
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' version=%s]' % (
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self.name,
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self._action_cls,
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self.code_source_id,
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self.version
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)
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def instantiate(self, params, wf_ctx):
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if not self._action_cls_attrs:
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# No need to create new dynamic type.
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return DynamicAction(
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self._action_cls(**params),
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self.code_source_id,
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self.namespace
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)
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dynamic_cls = type(
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self._action_cls.__name__,
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(self._action_cls,),
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**self._action_cls_attrs
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)
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return DynamicAction(
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dynamic_cls(**params),
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self.code_source_id,
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self.namespace
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)
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class DynamicActionSerializer(serialization.DictBasedSerializer):
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def serialize_to_dict(self, entity):
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cls = type(entity.action)
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return {
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'cls_name': cls.__name__,
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'cls_attrs': inspect_utils.get_public_fields(cls),
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'data': vars(entity.action),
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'code_source_id': entity.code_source_id,
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'namespace': entity.namespace,
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}
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def deserialize_from_dict(self, entity_dict):
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cls_name = entity_dict['cls_name']
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mod = _get_python_module(
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entity_dict['code_source_id'],
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entity_dict['namespace']
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)
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cls = getattr(mod[0], cls_name)
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cls_attrs = entity_dict['cls_attrs']
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if cls_attrs:
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cls = type(cls.__name__, (cls,), cls_attrs)
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action = cls.__new__(cls)
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for k, v in entity_dict['data'].items():
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setattr(action, k, v)
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return DynamicAction(
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action,
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entity_dict['code_source_id'],
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entity_dict['namespace']
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)
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def _get_python_module(code_source_id, namespace=''):
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code_source = db_api.get_code_source(
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code_source_id,
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namespace=namespace
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)
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mod = _load_python_module(code_source.name, code_source.content)
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return mod, code_source.version
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def _load_python_module(fullname, content):
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mod = types.ModuleType(fullname)
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exec(content, mod.__dict__)
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return mod
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serialization.register_serializer(DynamicAction, DynamicActionSerializer())
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class DynamicActionProvider(ml_actions.ActionProvider):
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"""Provides dynamic actions."""
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def __init__(self, name='dynamic'):
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super().__init__(name)
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# {code_source_id => (python module, version)}
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self._code_sources = dict()
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def ensure_latest_module_version(self, action_def):
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# We need to compare the version of the corresponding module
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# that's already loaded into memory with the version stored in
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# DB and reimport the module if the DB version is higher.
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code_src_id = action_def.code_source_id
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# TODO(rakhmerov): To avoid this DB call we need to store code source
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# versions also in the dynamic action definition model.
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db_ver = db_api.get_code_source(code_src_id, fields=['version'])[0]
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if db_ver > self._code_sources.get(code_src_id, (None, -1))[1]:
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# Reload module.
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code_src = db_api.get_code_source(code_src_id)
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module = _load_python_module(code_src.name, code_src.content)
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self._code_sources[code_src_id] = (module, code_src.version)
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else:
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module = self._code_sources[code_src_id][0]
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return module
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def _get_action_class(self, action_def):
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module = self.ensure_latest_module_version(action_def)
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return getattr(module, action_def.class_name)
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def _build_action_descriptor(self, action_def):
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action_cls = self._get_action_class(action_def)
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return DynamicActionDescriptor(
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name=action_def.name,
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cls_name=action_def.class_name,
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action_cls=action_cls,
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code_source_id=action_def.code_source_id,
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version=1,
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project_id=action_def.project_id,
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scope=action_def.scope
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)
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def find(self, action_name, namespace=None):
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action_def = db_api.load_dynamic_action_definition(
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action_name,
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namespace
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)
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if action_def is None:
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return None
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return self._build_action_descriptor(action_def)
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def find_all(self, namespace='', limit=None, sort_fields=None,
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sort_dirs=None, filters=None):
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if filters is None:
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filters = dict()
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filters['namespace'] = {'eq': namespace}
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action_defs = db_api.get_dynamic_action_definitions(
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limit=limit,
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sort_keys=sort_fields,
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sort_dirs=sort_dirs,
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**filters
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)
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return [self._build_action_descriptor(a_d) for a_d in action_defs]
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