Cloudformation-无法导入资源 [英] Cloudformation - Unable to Import resource

问题描述

我正在创建Step Functions，并想在cloudformation代码中引用Lambda函数。该lambda已从单独的堆栈中创建，并从该堆栈中导出为 LambdaA 。

I am creating Step Functions and would like to reference a Lambda function in the cloudformation code. The lambda is already created from separate stack and is exported as LambdaA from that stack.

我遇到了问题当我尝试将 LambdaA 导入到我的步进函数代码中时。

I am running into issue when I try to import LambdaA into my step function code.

这是我的cloudformation片段。

Here is my cloudformation snippet.

ABCStateMachine:
Type: 'AWS::StepFunctions::StateMachine'
Properties:
  StateMachineName: 'AbcStateMachine_1.0'
  RoleArn: 
    Fn::GetAtt: [ AbcStateMachineRole, Arn ] 
  DefinitionString: 
    Fn::Sub:
      - |-
        {
          "StartAt": "DoStuff",
          "Version": "1.0",
          "States": {
            "DoStuff" : {
              "Type": "Task",
              "Comment": "Does some stuff.,
              "Resource": {"Fn::ImportValue": "LambdaA"}, # error here
              "Next": "IsStuffDone"
            },
            "IsStuffDone": {
              "Type": "Choice",
            ...
            ...

我在Cloudformation控制台中收到以下错误：

I get the following error in Cloudformation console:

无效的状态机定义： / DoStuff / Resource上的SCHEMA_VALIDATION_FAILED（服务：AWSStepFunctions;状态码：400；错误代码：InvalidDefinition。

Invalid State Machine Definition: 'SCHEMA_VALIDATION_FAILED at /DoStuff/Resource' (Service: AWSStepFunctions; Status Code: 400; Error Code: InvalidDefinition.

关于这里可能出什么问题的任何想法？

Any idea as to what might be wrong here?

推荐答案

您不能在 Fn :: Sub 函数内使用其他内部函数。但是 Fn :: Sub 提供了解决此问题的方法。它的工作方式有点像 format 函数将在其他编程语言中工作。这是针对您的特定情况的一个示例：

You can't use other intrinsic function inside Fn::Sub function. But Fn::Sub offers a way to solve this. It works a bit like a format function would work in other programming languages. Here's an exemple for your particular case:

ABCStateMachine:
Type: 'AWS::StepFunctions::StateMachine'
Properties:
  StateMachineName: 'AbcStateMachine_1.0'
  RoleArn: 
    Fn::GetAtt: [ AbcStateMachineRole, Arn ] 
  DefinitionString: 
    Fn::Sub:
      - |-
        {
          "StartAt": "DoStuff",
          "Version": "1.0",
          "States": {
            "DoStuff" : {
              "Type": "Task",
              "Comment": "Does some stuff.,
              "Resource": ${LambdaToImport}, # error here
              "Next": "IsStuffDone"
            }
            ...
          }
          ...
        }
      - LambdaToImport:
          Fn::ImportValue: LambdaA

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