如何执行alamofire后台上传请求？

Question

我需要将 zip 文件发送到服务器端。

有我的要求，我需要在后台工作

let configuration = URLSessionConfiguration.default
    configuration.timeoutIntervalForRequest = 10 // seconds
    alamoFireManager = Alamofire.SessionManager(configuration: configuration)

appDeligate.log.debug("request was sended")

    alamoFireManager.upload(deligate.data!,
                            to: deligate.url,
                            method: .post,
                            headers: headers)
        .uploadProgress(closure: {
            progress in
            print("Upload Progress: \(progress.fractionCompleted)")
        })
        .validate()
        .responseJSON {}

现在它可以正常工作了，但我需要在后台执行它。根据 Alamofire README 文档

https://github.com/Alamofire/Alamofire

它说

使用后台配置创建会话管理器

让配置 = URLSessionConfiguration.background(withIdentifier: "com.example.app.background")

让 sessionManager = Alamofire.SessionManager(配置：配置)

我将配置更改为对应的后台配置

现在看起来像这样

let configuration = URLSessionConfiguration.background(withIdentifier: "com.room.myApp")
configuration.timeoutIntervalForRequest = 10 // seconds
    alamoFireManager = Alamofire.SessionManager(configuration: configuration)

alamoFireManager.upload(deligate.data!,
                            to: deligate.url,
                            method: .post,
                            headers: headers)
        .uploadProgress(closure: {
            progress in
            print("Upload Progress: \(progress.fractionCompleted)")
        })
        .validate()
        .responseJSON {}

我得到错误

*** Terminating app due to uncaught exception 'NSGenericException', reason: 'Upload tasks from NSData are not supported in background sessions.'
*** First throw call stack:
(0x18ec511b8 0x18d68855c 0x18f33808c 0x18f33796c 0x18f336e68  0x100ef9218 0x100f05dc8 0x18f336dc8 0x18f3378cc 0x100255890 0x1002518e8  0x100234200 0x100234448 0x100ef9218 0x100f05dc8 0x100233fc4 0x100255290  0x10029d238 0x10029ae4c 0x10029ac34 0x10006dd78 0x100071044 0x100082708  0x10002b310 0x100ef9258 0x100ef9218 0x100f0726c 0x100f08e2c 0x100f08b78  0x18dce32a0 0x18dce2d8c)
libc++abi.dylib: terminating with uncaught exception of type NSException

我做错了什么？

是我的问题还是 lib 的问题？

欢迎提问

编辑

有发送流

这是我如何创建 zip 文件

internal func madeRequest() {
    DispatchQueue.global().async {
        if self.createZipPhotoDir() {
            self.appDeligate.log.debug("zip dir was created")
            self.serverConnection.makeServerRequest()
        } else {
            self.appDeligate.log.error("can NOT execute createZipPhotoDir()")
        }
    }
}

private func createZipPhotoDir() -> Bool {
    let withContentsOfDirectory: String! = UtilDirectory.pathToMyCurrentAvatarDir.tweak() // "/var/mobile/Containers/Data/Application/739A895E-7BCA-47A8-911F-70FBC812CEB3/Documents/default@domein.com/AvatarPackage/name/"
    let atPath: String! = UtilDirectory.tempZipPath.tweak() // "/var/mobile/Containers/Data/Application/739A895E-7BCA-47A8-911F-70FBC812CEB3/Documents/default@domein.com/tmpZipDir.zip"
    
    return SSZipArchive.createZipFile(atPath: atPath, withContentsOfDirectory: withContentsOfDirectory)
}

zip 文件创建成功

然后我发出服务器请求

required init() {
    configureAlamofireManager()
}

private func configureAlamofireManager() {
    let configuration = URLSessionConfiguration.background(withIdentifier: "com.fittingroom.newtimezone.Fitzz")
    alamoFireManager = Alamofire.SessionManager(configuration: configuration)
}

internal func makeServerRequest() {
    appDeligate.log.debug("request was sended")

    alamoFireManager.upload(deligate.data!,
                            to: deligate.url,
                            method: .post,
                            headers: headers)
        .uploadProgress(closure: {
            progress in
            print("Upload Progress: \(progress.fractionCompleted)")
        })
        .validate()
        .responseJSON {
            [weak self]
            response in
            
            self?.appDeligate.log.debug("response : \(response)")
            self?.appDeligate.log.debug(String(describing: response.timeline))
            
            switch response.result {
            case .success(let value):
                self?.appDeligate.log.debug("succes in server connection response")
                let result = self?.getStatusCodeAndData(json: JSON(value))
                self?.deligate.onSuccess(statusCode: result?.statusCode, data: result?.data)
            case .failure(let error):
                self?.appDeligate.log.error("error in UploadingRequest : \(error)")
                self?.deligate.onError()
            }
    }
}

有一种方法可以让我发送数据

internal var data: Data {
    var data = Data()
    let filePath = UtilDirectory.tempZipPath.tweak()
    
    if let result = UtilFile.exists(path: filePath), result.isFileExist == true, result.whatIsIt == .file {
        if let fileData = FileManager.default.contents(atPath: filePath) {
            data = fileData
            appDeligate.log.debug("*** DATA : \(data) ***")
        } else {
            print("Could not parse the file")
        }

    } else {
        appDeligate.log.error("some ERROR here: file not exist")
    }

    return data
}

Answer 1

使用下面的代码一次，它对我有用

导入 Alamofire

var sessionManager: Alamofire.SessionManager
var backgroundSessionManager: Alamofire.SessionManager 
self.sessionManager = Alamofire.SessionManager(configuration: URLSessionConfiguration.default)
self.backgroundSessionManager = Alamofire.SessionManager(configuration: URLSessionConfiguration.background(withIdentifier: "com.youApp.identifier.backgroundtransfer"))


backgroundSessionManager.upload(multipartFormData: blockFormData!, usingThreshold: UInt64.init(), to: url, method: .post, headers: APIManager.headers(), encodingCompletion: { encodingResult in
switch encodingResult {
case .success(let upload, _, _):
    upload.uploadProgress {
        (progress) in
        let p = progress.fractionCompleted * 100
        uploadProgress(p)
    }
    upload.responseJSON { response in
        switch(response.result) {
        case .success(let JSON):
            DispatchQueue.main.async {
                    print(JSON)
            }
        case .failure(let error):
            DispatchQueue.main.async {
                print(error)
            }
        }
    }
case .failure(let error):
    DispatchQueue.main.async {
        print(error)
    }
}
})

Answer 2

来自Background Transfer Considerations ：

仅支持从文件上传任务（从数据对象或流上传将在程序退出后失败）。

这意味着它是来自 NSURLSession 的限制 - 您需要从文件上传，然后尝试使用文件解决其他错误

更新

appDeligate.log.debug("request was sended")

let tempZipFilePath = UtilDirectory.tempZipPath.tweak()

alamoFireManager.upload(tempZipFilePath,
                        to: deligate.url,
                        method: .post,
                        headers: headers)

Answer 3

你看到这个部分了吗Open Radars:

打开雷达

以下雷达对 Alamofire 的当前实施有一些影响。

rdar://26870455 - 后台 URL 会话配置在模拟器中不起作用