如何提取定义在AWS-cdk类型堆栈类构造函数到单独的文件？

Question

使用AWS-cdk进行实验，很容易看出堆栈/后端构造类文件是如何变得相当大的。在这个cdk Stack类示例中（从aws-cdk api-cors-lambda-crud-Dynamodb示例中复制和剪枝），是否有一种惯用的方法来从堆栈类构造函数函数中提取Dynamodb、lambda和apigateway构造函数定义到单独的文件中？他们都把this作为第一个参数。我希望有一个单独的文件，用于所有lambda def，一个用于db def，api网关配置等，这些文件仍然在主堆栈类中引用。有没有一种方法可以做到这一点，而不必为每个定义创建新的类？

export class ApiLambdaCrudDynamoDBStack extends cdk.Stack {
    constructor(app: cdk.App, id: string) {
        super(app, id);

        const dynamoTable = new dynamodb.Table(this, "items", {
            partitionKey: {
                name: "itemId",
                type: dynamodb.AttributeType.STRING
            },
            tableName: "items"
        });

        const getOneLambda = new lambda.Function(this, "getOneItemFunction", {
            code: new lambda.AssetCode("src"),
            handler: "get-one.handler",
            runtime: lambda.Runtime.NODEJS_10_X,
            environment: {
                TABLE_NAME: dynamoTable.tableName,
                PRIMARY_KEY: "itemId"
            }
        });

        const getAllLambda = new lambda.Function(this, "getAllItemsFunction", {
            code: new lambda.AssetCode("src"),
            handler: "get-all.handler",
            runtime: lambda.Runtime.NODEJS_10_X,
            environment: {
                TABLE_NAME: dynamoTable.tableName,
                PRIMARY_KEY: "itemId"
            }
        });

        dynamoTable.grantReadWriteData(getAllLambda);
        dynamoTable.grantReadWriteData(getOneLambda);

        const api = new apigateway.RestApi(this, "itemsApi", {
            restApiName: "Items Service"
        });

        const items = api.root.addResource("items");
        const getAllIntegration = new apigateway.LambdaIntegration(getAllLambda);
        items.addMethod("GET", getAllIntegration);

        const singleItem = items.addResource("{id}");
        const getOneIntegration = new apigateway.LambdaIntegration(getOneLambda);
        singleItem.addMethod("GET", getOneIntegration);
    }
}

Answer 1

是的，你可以把它们分成自己的书堆。LambdaStack、DynamoDbStack等。

或者，如果您不想直接在构造函数中使用helper类，则可以使用单独的helper类。下面是一个简单的C#示例：

public class ApiLambdaCrudDynamoDbStack : Stack 
{
    internal ApiLambdaCrudDynamoDbStack(Construct scope, string id) : base (scope, id)
    {
        var helper = new MyHelper();
        
        helper.CreateTable(this, "My-Cool-Table"); 
        
    }
}

public class MyHelper
{
    public void CreateTable(Construct scope, string tableName)
    {
        var table = new Table(scope, "My-Table", new TableProps()
        {
             TableName = tableName
        });
    }
}