亚马逊s3传输实用程序不能在后台运行

Question

我必须上传一个像4 4gb以上的大文件到亚马逊s3。amazon sdk提供了从s3上传和下载的两个选项。一个是awss3transfermanager，另一个是awss3transferutility。我实际上想使用awss3transferutility，因为我想让应用程序在后台继续上传。awss3transferutility有两个函数uploadFile和其他uploadFileUsingMultiPart。uploadFile函数实际上在后台工作，但上传在网络更改或丢弃时从0开始。出于这个原因，我目前使用的是uploadFileUsingMultiPart函数，这样在网络失败时，上传就不会从0重新开始。但是这个uploadFileUsingMultiPart函数不会在后台继续上传。在他们的最新版本中，他们在awstransferutility实用程序中引入了这个uploadFileUsingMultiPart函数。所以我预计上传会在后台继续，但不会在后台继续。我只想问是sdk相关的bug，还是我做错了什么

这就是我现在使用的代码

//在应用代理中

- (void)application:(UIApplication *)application handleEventsForBackgroundURLSession:(NSString *)identifier completionHandler:(void (^)(void))completionHandler {
    [AWSS3TransferUtility interceptApplication:application
           handleEventsForBackgroundURLSession:identifier
                             completionHandler:completionHandler];
}

//在ViewController中

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(reachabilityChanged:)
                                                 name:kReachabilityChangedNotification
                                               object:nil];

    __weak typeof(self) weakSelf = self;
    expression = [AWSS3TransferUtilityMultiPartUploadExpression new];
    expression.progressBlock = ^(AWSS3TransferUtilityMultiPartUploadTask *  task, NSProgress *  progress) {
       typeof(self) newWeakSelf = weakSelf;

       dispatch_async(dispatch_get_main_queue(), ^{
           // Do something e.g. Alert a user for transfer completion.

           NSLog(@"progress value %f",progress.fractionCompleted);
           // On failed uploads, `error` contains the error object.
           newWeakSelf->progressView.progress = progress.fractionCompleted;
       });
   };

   completionHandler = ^(AWSS3TransferUtilityMultiPartUploadTask *task, NSError *error) {
       dispatch_async(dispatch_get_main_queue(), ^{
           NSLog(@"uploading completed ");
       });
   };


   AWSCognitoCredentialsProvider *credentialsProvider = [[AWSCognitoCredentialsProvider alloc] initWithRegionType:AWSRegionUSEast1 identityPoolId:@"us-west-1:7a24b199-e4b2-4657-9627-sdfs4ssdff"];
   AWSServiceConfiguration *configuration = [[AWSServiceConfiguration alloc] initWithRegion:AWSRegionUSEast1 credentialsProvider:credentialsProvider];
   // AWSServiceManager.defaultServiceManager.defaultServiceConfiguration = configuration;

   AWSS3TransferUtilityConfiguration *tfConfig = [AWSS3TransferUtilityConfiguration new];
   tfConfig.retryLimit = 5;
   tfConfig.multiPartConcurrencyLimit = [NSNumber numberWithInteger:3];
   [AWSS3TransferUtility registerS3TransferUtilityWithConfiguration:configuration transferUtilityConfiguration:tfConfig forKey:@"transfer-utility-with-advanced-options"];

   transferUtility = [AWSS3TransferUtility S3TransferUtilityForKey:@"transfer-utility-with-advanced-options"];
}

-(void)startUploading {
    NSString *filePath =   [[NSBundle mainBundle] pathForResource:@"test" ofType:@"mp4"];
    NSURL *fileURL =  [NSURL fileURLWithPath:filePath];
    NSString *fileContentTypeStr = @"video/mp4";

    //  NSData *data = [NSData dataWithContentsOfURL:fileURL];
    //  AWSTask *task = [transferUtility uploadDataUsingMultiPart:data bucket:@"sibme-development" key:@"temp/testfilenew/testfile1.mp4" contentType:fileContentTypeStr expression:expression completionHandler:completionHandler ];

    AWSTask *task = [transferUtility uploadFileUsingMultiPart:fileURL bucket:@"development" key:@"temp/testfilenew/testfile.mp4" contentType:fileContentTypeStr expression:expression completionHandler:completionHandler];

    [task continueWithBlock:^id _Nullable(AWSTask * _Nonnull t) {
        if (t.result) {
          self->uplaodTask = t.result;
        }
        return nil;
    }];
}

Answer 1

我不是这方面的专家，但我在你的代码桶区域中注意到了一些东西：

initWithRegionType:AWSRegionUSEast1 identityPoolId:@"us-west-1:...

一旦我在代码中遇到类似的不匹配，bucket区域和Cognito身份池区域就不匹配，这就导致了问题。这可能是也可能不是你的代码中的情况，但只是根据我的经验添加一些信息。

AWSCognitoCredentialsProvider *credentialsProvider = [[AWSCognitoCredentialsProvider alloc] initWithRegionType:AWSRegionUSEast1 identityPoolId:@"us-west-1:7a24b199-e4b2-4657-9627-sdfs4ssdff"];
   AWSServiceConfiguration *configuration = [[AWSServiceConfiguration alloc] initWithRegion:AWSRegionUSEast1 credentialsProvider:credentialsProvider];

Answer 2

如果您认为SDK存在错误，可以尝试使用最新版本的SDK，如果您仍然看到问题，请在https://github.com/aws-amplify/aws-sdk-ios中打开一个问题，并执行一些再现步骤。