Swift Server Side - Kitura (8) Codable Routing
Swift Kitura Server Side IBM Codable Routing
我們講過了 Router 跟 Middleware
接下來講講 Codable Routing
什麼是 Codable Routing
簡單說就是把使用者傳進來的 httpBody 使用 Codable 轉成 Model
只要轉不成指定的 Mode，就不會進到指定的 handle, 然後給出 error
以下給個比對的範例，會更容易了解
以下是會用到的幾個 Model
struct GeneralResponse<T: Codable>: Codable {
let success: Bool = true
let data: T
}
struct RequestModel: Codable {
let name: String
}
struct MessageResponse: Codable {
let success: Bool = true
let message: String
}
原本的 Router 寫法
router.post("/hello", allowPartialMatch: false, middleware: BodyParser())
router.post("/hello") { req, res, next in
guard let json = req.body?.asJSON else {
res.status(.badRequest).send(json: ErrorResponse(message: "not correct request1"))
return
}
guard let name = json["name"] as? String else {
res.status(.badRequest).send(json: ErrorResponse(message: "not correct request2"))
return
}
if name.isEmpty {
res.status(.badRequest).send(json: MessageResponse(message: "not correct request3"))
} else {
res.status(.OK).send(json: GeneralResponse(data: "hello \(name), nice meet you"))
}
}
使用 Codable Routing 的寫法
router.post("/hello", handler: handler)
func handler(model: RequestModel,
completion: (GeneralResponse<String>?, RequestError?) -> Void) {
if model.name.isEmpty {
let body = MessageResponse(message: "not correct request")
let error = RequestError(.init(httpCode: 400), body: body)
completion(nil, error)
} else {
completion(GeneralResponse(data: "hello \(model.name), nice meet you"), nil)
}
}
兩段接近就是等義的，如果 model 的 欄位更多的話， Code 的差距就會更多了
下一篇來講講 Codable Routing, Model Type Error Handle
打完收工