AWSS3TransferUtility continuously drops upload, progress goes back to zero

[msencenb]

Using Xcode 7.3.1, iPhone 9.3 simulator, and AWSS3 2.4.6, to create an upload task. I'm using the image picker to grab one of the stock photos off of the simulator, and then trying to upload it's raw binary data to S3 using AWSS3TransferUtility like so (some variables changed like bucket name):

    NSData *dataToUpload = UIImagePNGRepresentation(image);

    AWSS3TransferUtilityUploadExpression *expression = [AWSS3TransferUtilityUploadExpression new];
    expression.progressBlock = ^(AWSS3TransferUtilityTask *task, NSProgress *progress) {
        dispatch_async(dispatch_get_main_queue(), ^{
            // Do something e.g. Update a progress bar.
            NSLog(@"fraction completed: %f", progress.fractionCompleted);
        });
    };

    AWSS3TransferUtilityUploadCompletionHandlerBlock completionHandler = ^(AWSS3TransferUtilityUploadTask *task, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            // Do something e.g. Alert a user for transfer completion.
            // On failed uploads, `error` contains the error object.
            if (error) {
                NSLog(@"upload failed error");
            } else {
                NSLog(@"successfully uploaded");
            }
        });
    };

    AWSS3TransferUtility *transferUtility = [AWSS3TransferUtility defaultS3TransferUtility];
    [[transferUtility uploadData:dataToUpload
                          bucket:@"mybucket"
                             key:fileKey
                     contentType:@"png"
                      expression:expression
                completionHander:completionHandler] continueWithBlock:^id(AWSTask *task) {
        if (task.error) {
            NSLog(@"Error: %@", task.error);
        }
        if (task.exception) {
            NSLog(@"Exception: %@", task.exception);
        }
        if (task.result) {
            NSLog(@"beginning upload");
        }

        return nil;
    }];

Unfortunately, the image gets to a certain percentage, and then simply drops back down to zero like this log:

fraction completed: 0.938850
fraction completed: 0.003058
fraction completed: 0.006116

The error or completion handler is never called, and I've tried on several wifi networks, even leaving my computer open for as many as ten minutes. It simply drops to zero repeatedly after restarting itself. Any tips to make this actually work? I could save the data to a file, but the binary upload option seems much easier at face value.

[msencenb]

This was an error on my part with granting the cognito role access to my S3 bucket. The link that provided me the most clear instructions is here, under the 'grant access to your s3 resources' section

[pratibha-bhandari]

In my case, when network goes down the progress gets stop and when network comes back then the upload progress gets to zero. It is simply getting restart with network reachability. Did you face this issue in your case?

[msencenb]

No, I did have problems with network reachability, but I also haven't tested that extensively in my app.

[jatindaveifuturz]

i am facing same issue , is there any solution?

[msencenb]

@jatindaveifuturz if you are facing the same problem as the original issue, see me comment above about cognito role access.

[CSabari]

@msencenb : Try like this let percentageUploaded:Float = Float(progress.fractionCompleted) * 100

[tmaly1980]

@msencenb The link you provided is expired, I'm curious though what the access is having to do with the issue, and how to fix it? Why does the progress show anything at all? Seems almost like it's never able to actually complete and tries from scratch again.

For me, I see it sit at 0% for a while, then suddenly go to 100% pretty quickly, without actually calling the completion handler, then restarts to no progress and retrying again. I'm using a cell hotspot, but the file is only 23 MB.

[msencenb]

@tmaly1980 I'm not sure why the progress was updated at all, just that changing my access level fixed it.

I can't quite remember what I did, but I believe it was modifying my anonymous cognito pool in IAM to have permissions on the s3 bucket it needed.

[atierian]

@tmaly1980 which version of AWS SDK for iOS are you using?
In 2.31.1 we released a fix that likely addresses what you're seeing.