Question

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

"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"
}
}

我得到了错误：

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

我给他们两个参数已经是“ helloworld”和“ Version”。为什么lambda函数仍然显示错误？

helloworld引用无服务器功能helloworld。

我使用“ Transform”：“ AWS :: Serverless-2016-10-31”，它在云形成文件的开头定义。

Answer 1

对于AWS::Serverless::Function资源，您可以使用version来访问alias和Ref

有关更多信息，请参考以下链接：

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？

1 个答案: