def get_context(cls):
"""
获取context
.. Note:: 此方法为从本地内存中读取context, 不涉及外部调用，应在context加载后使用
:return: GuardianContext对象
:rtype: GuardianContext
:raises EInvalidOperation: 非法操作
"""
if not cls._context:
raise exception.EInvalidOperation(
"guardian context is not init yet")
return cls._context
def save_operation(self, operation):
"""
持久化状态机信息
:param operation:
:return:
"""
if not self.lock:
log.e("current guardian instance no privilege to save operation")
raise exception.EInvalidOperation(
"current guardian instance no privilege to save operation")
operation_path = config.GuardianConfig.get_persistent_path("operations") + "/" + operation.operation_id
if not persistence.PersistenceDriver().exists(operation_path):
persistence.PersistenceDriver().create_node(path=operation_path)
persistence.PersistenceDriver().save_data(operation_path, pickle.dumps(operation))
log.d("save operation_id:{} success".format(operation.operation_id))
def add_node(self, node):
"""
增加节点
:param Node node: 节点
:return: None
:raises ETypeMismatch: 节点类型错误
:raises EInvalidOperation: 操作不合法
"""
if not isinstance(node, Node):
raise exception.ETypeMismatch("param node type must be Node")
elif node in self._nodes:
raise exception.EInvalidOperation(
"node {} already added".format(node.name))
else:
self._nodes.append(node)
self._nodes_process[node.name] = False
def save_context(self):
"""
运行数据持久化，当当前Guardian为主（lock属性为True）时，可持久化数据，否则失败
:return: 无返回
:rtype: None
:raises EInvalidOperation: 非法操作
"""
if not self.lock:
log.e("current guardian instance no privilege to save context")
raise exception.EInvalidOperation(
"current guardian instance no privilege to save context")
context_path = config.GuardianConfig.get_persistent_path("context")
context_to_persist = copy.deepcopy(self)
# 考虑反序列化时可能异常，不使用del删除属性operations
context_to_persist.operations = {}
persistence.PersistenceDriver().save_data(
context_path, pickle.dumps(context_to_persist))
log.i("save context success")
def save_context(self):
"""
运行数据持久化，当当前Guardian为主（lock属性为True）时，可持久化数据，否则失败
:return: 无返回
:rtype: None
:raises EInvalidOperation: 非法操作
"""
if not self.lock:
log.e("current guardian instance no privilege to save context")
raise exception.EInvalidOperation(
"current guardian instance no privilege to save context")
context_path = config.GuardianConfig.get_persistent_path("context")
context_to_persist = self
operations_tmp = self.operations
context_to_persist.operations = {}
try:
persistence.PersistenceDriver().save_data(context_path, pickle.dumps(context_to_persist))
except Exception as e:
self.operations = operations_tmp
log.r(e, "save context fail")
self.operations = operations_tmp
log.d("save context success")
