为什么函数 Fn::GetAtt 函数给我错误？

Question

我尝试使用fn::GetAtt函数来计算权限和引用。我的 cloudformation json 是：定义的资源部分为：

"Resources": {
"helloworld": {
  "Properties": {
    "AutoPublishAlias": "live",
    "Handler": "index.handler",
    "Runtime": "nodejs6.10",
    "CodeUri": "s3://ss-sheng/src/helloWorld.zip",
    "Role": {
      "Ref": "dependrole"
    },
    "Timeout": 3,
    "ReservedConcurrentExecutions": 5,
    "Tags": {
      "PROJECT": "My Point",
      "COST_CENTRE": "6400073401",
      "BUSINESS_UNIT": "My Programs",
      "BUSINESS_CONTACT": "Greg Windsor",
      "TIER": "Development"
    }
  },
  "Type": "AWS::Serverless::Function"
},
"helloworldpermission": {
  "DependsOn": "helloworld",
  "Properties": {
    "Action": "lambda:InvokeFunction",
    "FunctionName": {
      "Fn::Join": [
        ":",
        [
          {
            "Ref": "helloworld"
          },
          {
            "Fn::GetAtt": [
              "helloworld",
              "Version"
            ]
          }
        ]
      ]
    },
    "Principal": "apigateway.amazonaws.com"
  },
  "Type": "AWS::Lambda::Permission"
}
}

我收到错误：

Template error: every Fn::GetAtt object requires two non-empty parameters, the resource name and the resource attribute

我已经给了他们两个参数 "helloworld" 和 "Version"。为什么 lambda 函数仍然显示错误？

helloworld 引用无服务器函数 helloworld。

我用的是"Transform":"AWS::Serverless-2016-10-31"，定义在cloud-formation文件的开头

Answer 1

对于 AWS::Serverless::Function 资源，您可以使用 Ref

访问 version 和 alias

更多信息，请参考以下内容link：

https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#referencing-lambda-version--alias-resources

因此，而不是

{
        "Fn::GetAtt": [
          "helloworld",
          "Version"
        ]
      }

应该是，

{
        "Fn::Ref": [
          "helloworld",
          "Version"
        ]
      }

为什么函数 Fn::GetAtt 函数给我错误？

why the function Fn::GetAtt function give me error?

amazon-web-services

amazon-cloudformation

serverless