这是为SQS触发的lambda编写CFT的正确方法吗？

Question

你好我最近为我的lambda和sqs做了一个CFT（都在同一个帐户/区域）但是我注意到当我去aws控制台时，它在“输入端”和“输出端”都显示了SQS资源我的lambda。这是故意的吗？或者我只是错误地做了我的CFT。以下是相关的JSON代码。

 "MyLambdaFunctionRole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": {
                "Service": [
                  "lambda.amazonaws.com"
                ]
              },
              "Action": [
                "sts:AssumeRole"
              ]
            }
          ]
        },
        "Path": "/",
        "Policies": [
          {
            "PolicyName": "root",
            "PolicyDocument": {
              "Version": "2012-10-17",
              "Statement": [
                {
                "Effect": "Allow",
                  "Action": [
                    "sqs:ReceiveMessage",
                    "sqs:DeleteMessage",
                    "sqs:GetQueueAttributes"
                    ],
                  "Resource": {
                    "Fn::Sub": "arn:aws:sqs:${AWS::Region}:${AWS::AccountId}:test-${Environment}-my-queue"
                  }
                }
              ]
            }
          }
        ]
      }
    },

    "OutputRouterEventSource": {
      "Type": "AWS::Lambda::EventSourceMapping",
      "Properties": {
        "BatchSize": 10,
        "Enabled" : true,
        "EventSourceArn": {
          "Fn::Sub": "arn:aws:sqs:${AWS::Region}:${AWS::AccountId}:test-${Environment}-my-queue"
        },
        "FunctionName": {
          "Fn::GetAtt": [
            "MyLambdaFunction",
            "Arn"
          ]
        }
      }
    },

    "OutputRouterLambdaInvokePermission": {
    "Type": "AWS::Lambda::Permission",
    "Properties": {
      "Action": "lambda:InvokeFunction",
      "Principal": "sns.amazonaws.com",
      "SourceArn": {
        "Fn::Sub": "arn:aws:sqs:${AWS::Region}:${AWS::AccountId}:test-${Environment}-my-queue"
      },
      "FunctionName": {
          "Fn::Sub": "test-${Environment}-my-lambda"
        }
      }
    }

Answer 1

在这种情况下，双方都有SQS是正常的：SQS触发您的Lambda函数（左侧），您的Lambda函数的角色必须具有接收和删除队列（右侧）消息的权限。

（我认为你的OutputRouterLambdaInvokePermission资源中混合服务的主体是SNS，源代码引用了SQS队列的arn，你可以丢弃这个资源，因为SQS触发器不需要它）