如何在cloudformation中为aws设置maximumRetryAttempt？

Question

我有一个通过visual创建的无服务器项目，我正在寻找在cloudformation模板中设置特定lambda的maximumRetryAttempt。我看到了EventInvokeConfig，但是lambda函数名是自动生成的，并且与每个环境不同。我想知道是否有一个aws特定的参数来获得一个lambda函数名？

  "EventInvokeConfig": {
  "Type" : "AWS::Lambda::EventInvokeConfig",
  "Properties" : {
      "FunctionName" : "???",
      "MaximumRetryAttempts" : 0,
      "Qualifier" : "$LATEST"
    }
}

这是我的无服务器模板

{
 "AWSTemplateFormatVersion":"2010-09-09",
 "Transform":"AWS::Serverless-2016-10-31",
 "Description":"An AWS Serverless Application that uses the ASP.NET Core framework running in Amazon Lambda.",
 "Resources":{
    "MyFunctionLambda":{
       "Type":"AWS::Serverless::Function",
       "Properties":{
          "Handler":"MyPlatformServerless::MyPlatformServerless.Lambdas.MyFunctionLambda::FunctionHandler",
          "Runtime":"dotnetcore2.1",
          "CodeUri":"",
          "Description":"Default function",
          "MemorySize":512,
          "Timeout":60,
          "Role":null
       }
    }
 }
}

Answer 1

您可以使用Ref固有函数。对于AWS::Serverless::Function类型的资源，返回的值是函数的名称。

这可以在模板中定义的其他资源中引用。对于EventInvokeConfig，模板看起来像

{
    "AWSTemplateFormatVersion":"2010-09-09",
    "Transform":"AWS::Serverless-2016-10-31",
    "Description":"An AWS Serverless Application that uses the ASP.NET Core framework running in Amazon Lambda.",
    "Resources":{
        "MyFunctionLambda":{
            "Type":"AWS::Serverless::Function",
            "Properties":{
                "Handler":"MyPlatformServerless::MyPlatformServerless.Lambdas.MyFunctionLambda::FunctionHandler",
                "Runtime":"dotnetcore2.1",
                "CodeUri":"",
                "Description":"Default function",
                "MemorySize":512,
                "Timeout":60,
                "Role":null
            }
        },
        "EventInvokeConfig": {
            "Type" : "AWS::Lambda::EventInvokeConfig",
            "Properties" : {
                "FunctionName" : { "Ref" : MyFunctionLambda },
                "MaximumRetryAttempts" : 0,
                "Qualifier" : "$LATEST"
            }
        }
    }
}

Answer 2

您的问题可能已经解决，但您可以改进代码。在使用Serverless (SAM)时，可以在lambda资源属性中直接指定EventInvokeConfig，而不需要创建其他资源。请找到以下片段：

{
    "AWSTemplateFormatVersion":"2010-09-09",
    "Transform":"AWS::Serverless-2016-10-31",
    "Description":"An AWS Serverless Application that uses the ASP.NET Core framework running in Amazon Lambda.",
    "Resources":{
        "MyFunctionLambda":{
            "Type":"AWS::Serverless::Function",
            "Properties":{
                "Handler":"MyPlatformServerless::MyPlatformServerless.Lambdas.MyFunctionLambda::FunctionHandler",
                "Runtime":"dotnetcore2.1",
                "CodeUri":"",
                "Description":"Default function",
                "MemorySize":512,
                "Timeout":60,
                "Role":null,
                "EventInvokeConfig": {
                    "MaximumRetryAttempts" : 0
                }
            }
        }
    }
}

您还可以在DestinationConfig对象中指定其他属性，如MaximumEventAgeInSeconds和EventInvokeConfig。

参考资料：https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-property-function-eventinvokeconfiguration.html