amazon-web-services - 是否可以从 CloudWatch 为 Lambda 状态函数集创建计划规则

Question

我想使用 CloudFormation 按计划(30 分钟)使用 Step Functions 将一堆预先存在的 Lambda 函数创建到状态机中。我已成功为其他方法创建了堆栈。

本质上，我需要有关如何在 CloudFormation 中为 Step Functions 创建预定事件的帮助或指导。这是我一直在尝试的:

"NOTDScheduler": {
        "Type": "AWS::Events::Rule",
        "Properties": {
            "Description": "Schedules a NOTD every 30 minutes",
            "ScheduleExpression": "rate(30 minutes)",
            "State": "ENABLED",
            "Targets": [
                {
                    "Arn": "${statemachineARN}",
                    "statemachineARN": {
                        "Fn::GetAtt": [
                            "NOTDStateMachine",
                            "Arn"
                        ]
                    },
                    "Id": "NOTDScheduleTarget"
                }
            ]
        },

但我不断收到诸如

之类的错误

[Error] /Resources/NOTDScheduler/Properties/Targets/0/statemachineARN/Fn::GetAtt: Resource type AWS::StepFunctions::StateMachine does not support attribute {Arn}.

并且不知道为什么 Arn 不是受支持的属性。有解决办法吗？

Answer 1

要获取 AWS::StepFunctions::StateMachine 资源的 ARN，您需要调用 !Ref NOTDStateMachine 而不是 !GetAtt NOTDStateMachine.Arn

在此处检查返回值:http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-stepfunctions-statemachine.html