如何将正文(ByteBuffer)解码为Vapor4中的内容？

import Vapor

struct MyContent: Content {
    // 定义你的自定义数据模型
    let name: String
    let age: Int
}

struct MyContentDecoder: ContentDecoder {
    func decode<D>(_ decodable: D.Type, from body: ByteBuffer, headers: HTTPHeaders) throws -> EventLoopFuture<D> where D : Decodable {
        // 解码过程
        guard let data = body.getString(at: body.readerIndex, length: body.readableBytes) else {
            throw Abort(.badRequest)
        }
        
        // 将数据转换为自定义数据模型
        guard let jsonData = data.data(using: .utf8) else {
            throw Abort(.badRequest)
        }
        
        let decoder = JSONDecoder()
        let decodedContent = try decoder.decode(D.self, from: jsonData)
        
        return req.eventLoop.makeSucceededFuture(decodedContent)
    }
}

// 在路由中使用自定义解码器
app.routes.defaultMaxBodySize = "10mb"
app.content.decode(MyContent.self, using: MyContentDecoder())

// 处理路由请求
app.post("myRoute") { req -> EventLoopFuture<HTTPStatus> in
    let myContent = try req.content.decode(MyContent.self)
    
    return myContent.flatMap { content in
        // 处理解码后的内容
        print(content.name)
        print(content.age)
        
        return req.eventLoop.makeSucceededFuture(.ok)
    }
}