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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# 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.
#
import asyncio
import random
import string
class NEVER_SET:
pass
# Separator for components of the UUID
UUID_SEP = '-'
# Length of the random component of the UUID
UUID_LEN = 5
class ResourceState:
UNINITIALIZED = 'UNINITIALIZED'
PENDING_DEPS = 'PENDING_DEPS'
DEPS_OK = 'DEPS_OK'
PENDING_INIT = 'PENDING_INIT'
INITIALIZED = 'INITIALIZED'
PENDING_GET = 'PENDING_GET'
GET_DONE = 'GET_DONE'
PENDING_KEYS = 'PENDING_KEYS'
KEYS_OK = 'KEYS_OK'
PENDING_CREATE = 'PENDING_CREATE'
CREATED = 'CREATED'
DIRTY = 'DIRTY'
CLEAN = 'CLEAN'
PENDING_UPDATE = 'PENDING_UPDATE'
PENDING_DELETE = 'PENDING_DELETE'
DELETED = 'DELETED'
ERROR = 'ERROR'
class AttributeState:
UNINITIALIZED = 'UNINITIALIZED'
INITIALIZED = 'INITIALIZED'
DIRTY = 'DIRTY'
PENDING_INIT = 'PENDING_INIT'
PENDING_UPDATE = 'PENDING_UPDATE'
CLEAN = 'CLEAN'
ERROR = 'ERROR'
class Operations:
SET = 'set'
LIST_ADD = 'add'
LIST_REMOVE = 'remove'
LIST_CLEAR = 'clear'
class UUID:
def __init__(self, name, cls):
self._uuid = self._make_uuid(name, cls)
def _make_uuid(self, name, cls):
"""Generate a unique resource identifier
The UUID consists in the type of the resource, to which is added a
random identifier of length UUID_LEN. Components of the UUID are
separated by UUID_SEP.
"""
uuid = ''.join(random.choice(string.ascii_uppercase + string.digits)
for _ in range(UUID_LEN))
if name:
uuid = name # + UUID_SEP + uuid
return UUID_SEP.join([cls.__name__, uuid])
def __repr__(self):
return '<UUID {}>'.format(self._uuid)
def __lt__(self, other):
return self._uuid < other._uuid
__str__ = __repr__
class PendingValue:
def __init__(self, value = None):
self.clear(value)
def clear(self, value=NEVER_SET):
self.value = NEVER_SET
self.operations = list()
def trigger(self, action, value, cur_value = None):
if self.value is NEVER_SET:
if cur_value is not None:
self.value = cur_value
if action == Operations.SET:
self.value = value
self.operations = [(Operations.SET, value)]
elif action == Operations.LIST_CLEAR:
self.value = list()
self.operations = [(Operations.LIST_CLEAR, None)]
else:
if action == Operations.LIST_ADD:
self.value.append(value)
elif action == Operations.LIST_REMOVE:
self.value.remove(value)
else:
raise RuntimeError
self.operations.append((action, value))
class InstanceState:
def __init__(self, manager, instance, name = None):
# Unique identifier for the instance. This is useful for relation
# between resources
self.uuid = UUID(name, instance.__class__)
self.instance = instance
# Instance manager
self.manager = manager
# Events
self.events = dict()
# Stores the requested value : attribute_name -> requested operations =
# LIST set add remove clear
self.dirty = dict()
# Initialize resource state
self.lock = asyncio.Lock()
self.write_lock = asyncio.Lock()
self.state = ResourceState.UNINITIALIZED
self.clean = asyncio.Event()
self.clean.clear()
self.init = asyncio.Event()
self.init.clear()
self.change_event = asyncio.Event()
self.change_event.clear()
self.change_success = None
self.change_value = None
self.log = list()
self.attr_lock = dict()
self.attr_init = dict()
self.attr_clean = dict()
self.attr_state = dict()
self.attr_change_event = dict()
self.attr_change_success = dict()
self.attr_change_value= dict()
self.attr_log = dict()
# Initialize attribute state
for attribute in instance.iter_attributes():
self.attr_lock[attribute.name] = asyncio.Lock()
self.attr_init[attribute.name] = asyncio.Event()
self.attr_clean[attribute.name] = asyncio.Event()
self.attr_state[attribute.name] = AttributeState.UNINITIALIZED
self.attr_change_event[attribute.name] = asyncio.Event()
self.attr_change_event[attribute.name].clear()
self.attr_change_success[attribute.name] = None
self.attr_change_value[attribute.name] = None
self.dirty[attribute.name] = PendingValue(NEVER_SET)
self.attr_log[attribute.name] = list()
def set_dirty(self, attr_name):
self.attr_dirty.add(attr_name)
self.manager.set_dirty(self.uuid)
def trigger(self, attribute_name, action, value):
self.dirty[attribute_name].trigger(action, value)
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