# -*- encoding: utf-8 -*-
# Copyright (c) 2016 b<>com
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from watcher.common import exception
from watcher.common import utils
from watcher.db import api as dbapi
from watcher.objects import base
from watcher.objects import utils as obj_utils
[docs]class Strategy(base.WatcherObject):
dbapi = dbapi.get_instance()
fields = {
'id': int,
'uuid': obj_utils.str_or_none,
'name': obj_utils.str_or_none,
'display_name': obj_utils.str_or_none,
'goal_id': obj_utils.int_or_none,
'parameters_spec': obj_utils.dict_or_none,
}
@staticmethod
def _from_db_object(strategy, db_strategy):
"""Converts a database entity to a formal object."""
for field in strategy.fields:
strategy[field] = db_strategy[field]
strategy.obj_reset_changes()
return strategy
@staticmethod
def _from_db_object_list(db_objects, cls, context):
"""Converts a list of database entities to a list of formal objects."""
return [Strategy._from_db_object(cls(context), obj)
for obj in db_objects]
@classmethod
[docs] def get(cls, context, strategy_id):
"""Find a strategy based on its id or uuid
:param context: Security context. NOTE: This should only
be used internally by the indirection_api.
Unfortunately, RPC requires context as the first
argument, even though we don't use it.
A context should be set when instantiating the
object, e.g.: Strategy(context)
:param strategy_id: the id *or* uuid of a strategy.
:returns: a :class:`Strategy` object.
"""
if utils.is_int_like(strategy_id):
return cls.get_by_id(context, strategy_id)
elif utils.is_uuid_like(strategy_id):
return cls.get_by_uuid(context, strategy_id)
else:
raise exception.InvalidIdentity(identity=strategy_id)
@classmethod
[docs] def get_by_id(cls, context, strategy_id):
"""Find a strategy based on its integer id
:param context: Security context. NOTE: This should only
be used internally by the indirection_api.
Unfortunately, RPC requires context as the first
argument, even though we don't use it.
A context should be set when instantiating the
object, e.g.: Strategy(context)
:param strategy_id: the id of a strategy.
:returns: a :class:`Strategy` object.
"""
db_strategy = cls.dbapi.get_strategy_by_id(context, strategy_id)
strategy = Strategy._from_db_object(cls(context), db_strategy)
return strategy
@classmethod
[docs] def get_by_uuid(cls, context, uuid):
"""Find a strategy based on uuid
:param context: Security context. NOTE: This should only
be used internally by the indirection_api.
Unfortunately, RPC requires context as the first
argument, even though we don't use it.
A context should be set when instantiating the
object, e.g.: Strategy(context)
:param uuid: the uuid of a strategy.
:returns: a :class:`Strategy` object.
"""
db_strategy = cls.dbapi.get_strategy_by_uuid(context, uuid)
strategy = cls._from_db_object(cls(context), db_strategy)
return strategy
@classmethod
[docs] def get_by_name(cls, context, name):
"""Find a strategy based on name
:param name: the name of a strategy.
:param context: Security context
:returns: a :class:`Strategy` object.
"""
db_strategy = cls.dbapi.get_strategy_by_name(context, name)
strategy = cls._from_db_object(cls(context), db_strategy)
return strategy
@classmethod
[docs] def list(cls, context, limit=None, marker=None, filters=None,
sort_key=None, sort_dir=None):
"""Return a list of :class:`Strategy` objects.
:param context: Security context. NOTE: This should only
be used internally by the indirection_api.
Unfortunately, RPC requires context as the first
argument, even though we don't use it.
A context should be set when instantiating the
object, e.g.: Strategy(context)
:param filters: dict mapping the filter key to a value.
:param limit: maximum number of resources to return in a single result.
:param marker: pagination marker for large data sets.
:param sort_key: column to sort results by.
:param sort_dir: direction to sort. "asc" or "desc".
:returns: a list of :class:`Strategy` object.
"""
db_strategies = cls.dbapi.get_strategy_list(
context,
filters=filters,
limit=limit,
marker=marker,
sort_key=sort_key,
sort_dir=sort_dir)
return Strategy._from_db_object_list(db_strategies, cls, context)
[docs] def create(self, context=None):
"""Create a :class:`Strategy` record in the DB.
:param context: Security context. NOTE: This should only
be used internally by the indirection_api.
Unfortunately, RPC requires context as the first
argument, even though we don't use it.
A context should be set when instantiating the
object, e.g.: Strategy(context)
"""
values = self.obj_get_changes()
db_strategy = self.dbapi.create_strategy(values)
self._from_db_object(self, db_strategy)
[docs] def destroy(self, context=None):
"""Delete the :class:`Strategy` from the DB.
:param context: Security context. NOTE: This should only
be used internally by the indirection_api.
Unfortunately, RPC requires context as the first
argument, even though we don't use it.
A context should be set when instantiating the
object, e.g.: Strategy(context)
"""
self.dbapi.destroy_strategy(self.id)
self.obj_reset_changes()
[docs] def save(self, context=None):
"""Save updates to this :class:`Strategy`.
Updates will be made column by column based on the result
of self.what_changed().
:param context: Security context. NOTE: This should only
be used internally by the indirection_api.
Unfortunately, RPC requires context as the first
argument, even though we don't use it.
A context should be set when instantiating the
object, e.g.: Strategy(context)
"""
updates = self.obj_get_changes()
self.dbapi.update_strategy(self.id, updates)
self.obj_reset_changes()
[docs] def refresh(self, context=None):
"""Loads updates for this :class:`Strategy`.
Loads a strategy with the same uuid from the database and
checks for updated attributes. Updates are applied from
the loaded strategy column by column, if there are any updates.
:param context: Security context. NOTE: This should only
be used internally by the indirection_api.
Unfortunately, RPC requires context as the first
argument, even though we don't use it.
A context should be set when instantiating the
object, e.g.: Strategy(context)
"""
current = self.__class__.get_by_id(self._context, strategy_id=self.id)
for field in self.fields:
if (hasattr(self, base.get_attrname(field)) and
self[field] != current[field]):
self[field] = current[field]
[docs] def soft_delete(self, context=None):
"""Soft Delete the :class:`Strategy` from the DB.
:param context: Security context. NOTE: This should only
be used internally by the indirection_api.
Unfortunately, RPC requires context as the first
argument, even though we don't use it.
A context should be set when instantiating the
object, e.g.: Strategy(context)
"""
self.dbapi.soft_delete_strategy(self.id)