iOS 图片上传到 AWS S3 Bucket 非常慢

Question

我正在尝试使用 AWS SDK 从我的 iOS 应用程序将图像上传到 AWS S3 存储桶。我使用以下方法上传图片:

func uploadMedia(mediaData: Data, mediaID: String) {

        let credentialsProvider = AWSCognitoCredentialsProvider(regionType:.SomeRegion,
                                                                identityPoolId:"my identity pool ...")
        let configuration = AWSServiceConfiguration(region:.SomeRegion, credentialsProvider:credentialsProvider)
        AWSServiceManager.default().defaultServiceConfiguration = configuration

        let transferManager = AWSS3TransferManager.default()

        let uploadingFileURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(mediaID)
        do {
            try mediaData.write(to: uploadingFileURL, options: Data.WritingOptions.atomic)
        } catch let error as NSError {
            print("Could not save \(error), \(error.userInfo)")
        }

        let uploadRequest = AWSS3TransferManagerUploadRequest()!

        uploadRequest.bucket = "myBucket"
        uploadRequest.key = mediaID + ".jpg"
        uploadRequest.body = uploadingFileURL
        uploadRequest.contentType = "image/jpeg"

        transferManager.upload(uploadRequest).continueWith(executor: AWSExecutor.mainThread(), block: { (task:AWSTask<AnyObject>) -> Any? in

            if let error = task.error as NSError? {
                if error.domain == AWSS3TransferManagerErrorDomain, let code = AWSS3TransferManagerErrorType(rawValue: error.code) {
                    switch code {
                    case .cancelled, .paused:
                        break
                    default:
                        print("Error uploading: \(uploadRequest.key!) Error: \(error)")
                    }
                } else {
                    print("Error uploading: \(uploadRequest.key!) Error: \(error)")
                }
                return nil
            }

            let uploadOutput = task.result
            print("Upload complete for: \(uploadRequest.key!)")
            return nil
        })
    }

上传成功，但比仅通过 PHP 脚本上传到我的 EC2 实例中的目录花费的时间要长得多。即使对于只有 30 KB 左右的小文件，也需要多几秒钟的时间。我已经关闭了默认的服务器加密，但这并没有太大帮助。

我是否正确使用 SDK 上传图像数据？数据本地存储在 coreData 中，并作为数据而不是图像文件提取。这就是为什么我创建一个临时目录来创建用于上传的 url。

Answer 1

下面是基于 sqlbot 注释的代码:配置和传输管理器定义被移动到帮助程序类的初始化程序中。如果图片文件存储在文档文件系统中，则也不需要创建临时文件以获得更多优势，但我使用 coreData，因此需要保留它。

尽早在您的 viewController 中初始化 MediaHelper 的一个实例(让 mediaHelper = MediaHelper())并维护对它的引用，以便尽早完成初始化并且仅完成一次。

class MediaHelper {

    var transferManager: AWSS3TransferManager!

    init() {
        let credentialsProvider = AWSCognitoCredentialsProvider(regionType:.SomeRegion,
                                                                identityPoolId:"my identity pool ...")
        let configuration = AWSServiceConfiguration(region:.SomeRegion, credentialsProvider:credentialsProvider)
        AWSServiceManager.default().defaultServiceConfiguration = configuration

        self.transferManager = AWSS3TransferManager.default()
    }

    func uploadMedia(mediaData: Data, mediaID: String) {

        let uploadingFileURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(mediaID)
        do {
            try mediaData.write(to: uploadingFileURL, options: Data.WritingOptions.atomic)
        } catch let error as NSError {
            print("Could not save \(error), \(error.userInfo)")
        }

        let uploadRequest = AWSS3TransferManagerUploadRequest()!

        uploadRequest.bucket = "myBucket"
        uploadRequest.key = mediaID + ".jpg"
        uploadRequest.body = uploadingFileURL
        uploadRequest.contentType = "image/jpeg"

        transferManager.upload(uploadRequest).continueWith(executor: AWSExecutor.mainThread(), block: { (task:AWSTask<AnyObject>) -> Any? in

            if let error = task.error as NSError? {
                if error.domain == AWSS3TransferManagerErrorDomain, let code = AWSS3TransferManagerErrorType(rawValue: error.code) {
                    switch code {
                    case .cancelled, .paused:
                        break
                    default:
                        print("Error uploading: \(uploadRequest.key!) Error: \(error)")
                    }
                } else {
                    print("Error uploading: \(uploadRequest.key!) Error: \(error)")
                }
                return nil
            }

            let uploadOutput = task.result
            print("Upload complete for: \(uploadRequest.key!)")
            return nil
        })
    }

}