如何将正文（ByteBuffer）解码为 Vapor 4 中的内容？

Question

当 ResponseReceipt 符合此处的 Content 协议时，我可以轻松解码 response.content，如 Vapor 文档中所述。

let receipt = try? response.content.decode(ResponseReceipt.self)

但是要理解如何使用 Vapor 的工具解码 response.body 并不容易，因为它是 ByteBuffer。如何以类似于 Vapor 的原生方式解码 response.body？

Answer 1

首先，了解 ByteBuffer 是一种字节集合很重要，因此您可以从中读取字节并尝试像这样初始化 Data

guard let byteBuffer = req.body.data else { throw Abort(.badRequest) }
let data = Data(buffer: byteBuffer)
let receipt = try JSONDecoder().decode(ResponseReceipt.self, from: data)

或者像这样

guard let byteBuffer = response.body.data else { throw Abort(.badRequest) }
guard let data = byteBuffer.getData(at: 0, length: byteBuffer.readableBytes) else { throw Abort(.badRequest) }
let receipt = try JSONDecoder().decode(ResponseReceipt.self, from: data)

但是使用 Vapor 你有两种更方便的方法来解码字节缓冲区

选择你更喜欢哪一个

guard let byteBuffer = response.body.data else { throw Abort(.badRequest) }
let receipt = try JSONDecoder().decode(ResponseReceipt.self, from: byteBuffer)

再来一个

guard let byteBuffer = response.body.data else { throw Abort(.badRequest) }
guard let receipt = try byteBuffer.getJSONDecodable(ResponseReceipt.self, at: 0, length: byteBuffer.readableBytes)

还有一个

guard let byteBuffer = response.body.data else { throw Abort(.badRequest) }
guard let receipt = try byteBuffer.getJSONDecodable(ResponseReceipt.self, decoder: JSONDecoder(), at: 0, length: byteBuffer.readableBytes)

如何将正文（ByteBuffer）解码为 Vapor 4 中的内容？

How to decode body (ByteBuffer) to Content in Vapor 4?

json

swift

decode

vapor