Duplicate Upload with events not being cleared from local data store

[subbuthepeaceful]

Details of Customer Keen IO Integration:

We are using Keen Library v3.5.5. We are not overriding keen.timestamp and are calling self.keenClient.uploadWithFinishedBlock when our app enters background mode.

Customer reports seeing duplicates around 25-35%. We can confirm that events with the exact same payload are being 'generated' twice i.e. with different values for keen.created_at.

This may be similar to Issue #156, but unsure whether uploadWithFinishedBlock is being called successively.

Opening the issue here so that we can collect more information in terms of trying to replicate the problem.

[subbuthepeaceful]

Code block provided:

Keen Upload

func uploadToDataKeen() {

  let application = UIApplication.sharedApplication()

  let backgroundTaskID = application.beginBackgroundTaskWithExpirationHandler { () -> Voidin

    print("Upload task for keen is expiring")

  }

  self.keenClient.uploadWithFinishedBlock { () -> Voidin

    application.endBackgroundTask(backgroundTaskID)

  }

}

And the function is called via Observer callback:

@objcprivatefunc didEnterBackground() {

  trackPotentialOldSavedSession()

  saveCurrentSession()

  uploadToDataKeen()

}

The observer is registered as follows:

NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(TrackingService.didEnterBackground), name: UIApplicationDidEnterBackgroundNotification, object: nil)

[heitortsergent]

@subbuthepeaceful thanks for sending the code snippets, I'm sorry this is happening. :(

Looking at the code, nothing comes to mind on why this may be happening... I'm going to take a closer look at this later today and update you here.

[subbuthepeaceful]

Thank you very much @heitortsergent Please let me know if we can provide any additional information that would help diagnose

[heitortsergent]

@subbuthepeaceful I still don't see anything in the code snippets that could be causing the error...

Could you please ask the customer the code block where they're calling the last line:

NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(TrackingService.didEnterBackground), name: UIApplicationDidEnterBackgroundNotification, object: nil)

[schwmi]

Hi, @heitortsergent. We add this observer in the init of our TrackingService class. This class is a singleton and responsible for creating our keen events and calling the uploadWithFinishBlock method.

[calhouncole]

Hi all,

Has there been any progress on this? I've been running into the same issues.

FYI, @schwmi @heitortsergent @subbuthepeaceful

[schwmi]

Hi, is there any news on this issue?