ALIYUN::ROS::Assert_资源编排(ROS)-阿里云帮助中心

ALIYUN::ROS::Assert用于创建断言。断言用于验证条件，支持多种操作类型，并允许配置失败时是否终止创建以及返回的错误消息。

语法

{
  "Type": "ALIYUN::ROS::Assert",
  "Properties": {
    "Values": List,
    "AbortCreation": Boolean,
    "ErrorMessage": String,
    "Operation": String
  }
}

属性

属性名称	类型	必须	允许更新	描述	约束
Values	List	是	否	待验证的断言的列表。	列表中的项目按顺序进行比较。列表长度范围为一到三个。说明仅当操作为“等于”或“不等于”时，才支持三个值的比较。仅当操作为“非”时，才支持一个值。
AbortCreation	Boolean	否	否	当断言失败时，是否终止创建。	默认值为True。
ErrorMessage	String	否	否	当断言失败时要返回的错误消息。	无。
Operation	String	否	否	断言的类型。	支持的操作有： Equal：等于（默认值） NotEqual：不等于 Greater：大于 GreaterOrEqual：大于或等于 Less：小于 LessOrEqual：小于或等于 Contain：包含 NotContain：不包含 And：与 Or：或 Not：非

返回值

Fn::GetAtt

Result：断言的结果。
FailureCause：断言失败的原因。

示例

YAML

ROSTemplateFormatVersion: '2015-09-01'
Parameters:
  Values:
    Type: Json
    Description:
      en: |-
        A list of values to assert. The items in the list are compared in order. The range of length is one to three. 
        - Three values are supported only if the operation is Equal or NotEqual.
        - One value is supported only if the operation is Not.
    Required: true
    MinLength: 1
    MaxLength: 3
Resources:
  Assert:
    Type: ALIYUN::ROS::Assert
    Properties:
      Values:
        Ref: Values
Outputs:
  Result:
    Description: The result of the assert.
    Value:
      Fn::GetAtt:
        - Assert
        - Result
  FailureCause:
    Description: The reason the assertion failed
    Value:
      Fn::GetAtt:
        - Assert
        - FailureCause

JSON

{
  "ROSTemplateFormatVersion": "2015-09-01",
  "Parameters": {
    "Values": {
      "Type": "Json",
      "Description": {
        "en": "A list of values to assert. The items in the list are compared in order. The range of length is one to three. \n- Three values are supported only if the operation is Equal or NotEqual.\n- One value is supported only if the operation is Not."
      },
      "Required": true,
      "MinLength": 1,
      "MaxLength": 3
    }
  },
  "Resources": {
    "Assert": {
      "Type": "ALIYUN::ROS::Assert",
      "Properties": {
        "Values": {
          "Ref": "Values"
        }
      }
    }
  },
  "Outputs": {
    "Result": {
      "Description": "The result of the assert.",
      "Value": {
        "Fn::GetAtt": [
          "Assert",
          "Result"
        ]
      }
    },
    "FailureCause": {
      "Description": "The reason the assertion failed",
      "Value": {
        "Fn::GetAtt": [
          "Assert",
          "FailureCause"
        ]
      }
    }
  }
}