amazon-web-services - 您可以将 "Fn::FindInMap"嵌套在 "Fn::Sub"中吗？

Question

我正在这样做:

{"Fn::Join": [":", [
    "arn:aws:sns",
    { "Ref": "AWS::Region"},
    { "Ref": "AWS::AccountId"},
    {"Fn::FindInMap" : [ "config", "mytopic", { "Ref" : "deployment" } ] }
]]

但我更喜欢像这样使用 SUB 但它不是有效的 JSON:

{"Fn::Sub" : "arn:aws:sns:${AWS::Region}:${AWS::AccountId}:${"Fn::FindInMap" : [ "config", "mytopic", { "Ref" : "deployment" } ] }"}

Answer 1

您无法直接从 Fn::Sub 模板调用 Fn::FindInMap。 Only a limited number of expressions work OOTB.

相反，您可以将其他变量传递给 Fn::Sub。例如:

      DefinitionString: !Sub 
        - |-
          {
             "Comment":"Extract metadata and anonymize the videoclip",
             "StartAt":"ExtractMetadataAndAnonymize",
             "States":{
                "ExtractMetadataAndAnonymize":{
                   "Type":"Parallel",
                   "Next":"LogResult",
                   "Branches":[
                      {
                         "StartAt":"AlarmIfVideoverarbeitungClusterIsEmpty",
                         "States":{
                            "AlarmIfVideoverarbeitungClusterIsEmpty":{
                               "Type":"Task",
                               "Resource":"${EmptyVideoverarbeitungClusterAlarmFunction_Arn}",
                               ....
                }
             }
          }
        - EmptyVideoverarbeitungClusterAlarmFunction_Arn: !ImportValue 
            'Fn::Sub': 'stk-${EnvType}-${EnvId}-videoverarbeitung-cluster-EmptyVideoverarbeitungClusterAlarmFunction-Arn'

在这里，我计算一些值并将其作为 EmptyVideoverarbeitungClusterAlarmFunction_Arn 变量传递给 Sub。