如何在一个处理程序中处理所有类型请求的响应，同时也用Alamofire和Moya唯一地处理每个请求

Question

在我的应用程序中，我使用Moya和Alamofire（还有Moya/rxswift和Moya-ObjectMapper）库来处理所有的网络请求和响应。

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例如，对于任何请求，我可以得到响应“无效版本”，我希望避免签入每个响应，如果这个错误到达。

有没有用 处理这个用例的优雅方法？

Answer 1

我建议使用泛型参数化方法。

class DefaultNetworkPerformer {
    private var provider: RxMoyaProvider<GitHubApi> = RxMoyaProvider<GitHubApi>()


    func performRequest<T:Mappable>(_ request: GitHubApi) -> Observable<T> {
        return provider.request(request).mapObject(T.self)
    }
}

将处理来自您Moya 的所有请求。在我的例子中，它是 。此实现的示例用法如下:

var networkPerformer = DefaultNetworkPerformer()
let observable: Observable<User> = networkPerformer.performRequest(GitHubApi.user(username: "testUser"))

在这里，您可以“告知”网络执行者，该响应将包含 对象。

observable.subscribe {
    event in
    switch event {
    case .next(let user):
        //if mapping will succeed here you'll get an Mapped Object. In my case it was User that conforms to Mappable protocol
        break
    case .error(let error):
        //here you'll get MoyaError if something went wrong
        break
    case .completed:
        break
    }
}

Answer 2

显然这很简单，你只需要创建你自己的插件。并将其添加到您的提供程序实例中（您可以在init函数中添加它）

例如:

struct NetworkErrorsPlugin: PluginType {

    /// Called immediately before a request is sent over the network (or stubbed).
    func willSendRequest(request: RequestType, target: TargetType) { }

    /// Called after a response has been received, but before the MoyaProvider has invoked its completion handler.
    func didReceiveResponse(result: Result<Moya.Response, Moya.Error>, target: TargetType) {

        let responseJSON: AnyObject
        if let response = result.value {
            do {
                responseJSON = try response.mapJSON()
                if let response = Mapper<GeneralServerResponse>().map(responseJSON) {
                    switch response.status {
                    case .Failure(let cause):
                        if cause == "Not valid Version" {
                            print("Version Error")
                        }
                    default:
                        break
                    }
                }
            } catch {
                print("Falure to prase json response")
            }
        } else {
            print("Network Error = \(result.error)")
        }
    }
}