RxAlamofire - 如何获得错误响应？

Question

当 RxAlamofire 调用发生错误时，我需要响应正文。我见过this hack但我想知道是否有更清洁的方法。

受此启发，我创建了这个 RxAlamofire fork有一个类似的黑客。有了它，错误通常是 DataResponseError 的一个实例。所以你可以这样做:

RxAlamofire.data(method, url).subscribe(

  onError: { error in

    if let error = error as? DataResponseError<Data> {

      // Get response body (in this case, convert it to a String)
      if let data = error.response.data {
          let message = String(data: data, encoding: String.Encoding.utf8)
          print("Message: \(message)")
      }

      // Get status code
      if let statusCode = error.response.response?.statusCode {
          print("Status code: \(statusCode)")
      }
    }
  }
)

Answer 1

问题描述。我正在使用 RxAlamofire 发出网络请求，我需要从错误响应的正文中获取信息。

我以以下方式进行了黑客攻击:

添加了一个 PError:

import UIKit
import Alamofire
import ObjectMapper

class PError: Error, Mappable {
    var message: String?
    var statusCode: Int?

    required init?(map: Map) {

    }

    func mapping( map: Map) {
        message <- map["error.message"]
        statusCode <- map["error.statusCode"]
    }
}

现在向 DataRequest 添加了这样的扩展:

import Alamofire
import ObjectMapper

    extension DataRequest {
        //Overriding several methods from Alamofire Validation
        @discardableResult
        public func validate<S: Sequence>(statusCode acceptableStatusCodes: S) -> Self where S.Iterator.Element == Int {
            return validate { [unowned self] _, response, bodyData in
                return self.validate(statusCode: acceptableStatusCodes, response: response, bodyData: bodyData)
            }
        }

        //Overriding several methods from Alamofire Validataion
        fileprivate func validate<S: Sequence>(
            statusCode acceptableStatusCodes: S,
            response: HTTPURLResponse, bodyData: Data?)
            -> ValidationResult
            where S.Iterator.Element == Int
        {
            if acceptableStatusCodes.contains(response.statusCode) {
                return .success
            } else {
                var error: Error = AFError.responseValidationFailed(reason: AFError.ResponseValidationFailureReason.unacceptableStatusCode(code: response.statusCode))
                if let bodyData = bodyData {
                    if let jsonString = String(data: bodyData, encoding: .utf8) {
                        if let errorNew = Mapper<PError>().map(JSONString: jsonString)
                        {
                            error = errorNew
                        }
                    }
                }
                return .failure(error)
            }
        }
    }

接下来，在代码中的某处，您将能够使用此自定义错误对象:

if let err = error as? PError {
                status = err.message ?? "No message in the error description"
            }
            else