iOS - Alamofire RequestRetrier 未被激发

Question

我正在尝试实现一种重试机制，我看到 alamofire 有一个。我正在尝试实现一个简单的重试机制，并指定请求的次数，但出现了问题。

class OAuth2Handler: RequestAdapter, RequestRetrier {
  func adapt(_ urlRequest: URLRequest) throws -> URLRequest {
    return urlRequest
 }

var defaultRetryCount = 4
private  var requestsAndRetryCounts: [(Request, Int)] = []
private  var lock = NSLock()

private func index(request: Request) -> Int? {
    return requestsAndRetryCounts.index(where: { $0.0 === request })
}

func addRetryInfo(request: Request, retryCount: Int? = nil) {
    lock.lock() ; defer { lock.unlock() }
    guard index(request: request) == nil else { print("ERROR addRetryInfo called for already tracked request"); return }

    requestsAndRetryCounts.append((request, retryCount ?? defaultRetryCount))
}

func deleteRetryInfo(request: Request) {
    lock.lock() ; defer { lock.unlock() }
    guard let index = index(request: request) else { print("ERROR deleteRetryInfo called for not tracked request"); return }

    requestsAndRetryCounts.remove(at: index)
}

func should(_ manager: SessionManager, retry request: Request, with error: Error, completion: @escaping RequestRetryCompletion){

    lock.lock() ; defer { lock.unlock() }

    guard let index = index(request: request) else { completion(false, 0); return }
    let (request, retryCount) = requestsAndRetryCounts[index]

    if retryCount == 0 {
        completion(false, 0)
    } else {
        requestsAndRetryCounts[index] = (request, retryCount - 1)
        completion(true, 0.5)
    }
 }
}

这是我尝试使用的类:

let sessionManager = SessionManager()

override init() {
    sessionManager.adapter = RequestAdapter.self as? RequestAdapter
    sessionManager.retrier = OAuth2Handler()
}


func sendRequest(url: String,meth: HTTPMethod,parameters: [String: AnyObject]?, success: @escaping (String, Data) -> Void, failure: @escaping (Error) -> Void) {

    self.asyncSerialWorker.enqueueWork { (done) in
        self.sessionManager.request(url, method:meth).responseJSON { (responseObject) -> Void in
            if responseObject.result.isSuccess {
                print("Generic succsess")
                let value = responseObject.result.value
                let json = JSON(value!)
                guard let result = responseObject.data else {return}
                success(self.parser.parseMaiden(json: json), result)
            }

            if responseObject.result.isFailure {
                let error : Error = responseObject.result.error!

                print("login failed")
                failure(error)
            }
            done()
        }
    }
} 

如果还有其他建议，我很想听听

谢谢

Answer 1

sessionManager.adapter = RequestAdapter.self 作为？ RequestAdapter 似乎非常错误。您应该将其设置为 OAuth2Handler 的实例。