Troubleshoot errors

This section describes how to handle errors.

Handle update_mask errors

When GMTDDeliveryVehicleReporter sends a vehicle update, an update_mask error can occur when the updateMask query parameter is empty. To prevent this error, always provide at least one field name. It typically occurs for the first update after startup. For more information about updating vehicle fields in Fleet Engine, see Update vehicle fields.

The following example shows how to handle this error:

Swift

import GoogleRidesharingDriver

class VehicleReporterListener: NSObject, GMTDVehicleReporterListener {
  func vehicleReporter(
    _ vehicleReporter: GMTDVehicleReporter,
    didFail vehicleUpdate: GMTDVehicleUpdate,
    withError error: Error
  ) {
    let fullError = error as NSError
    if let innerError = fullError.userInfo[NSUnderlyingErrorKey] as? NSError {
      let innerFullError = innerError as NSError
      if innerFullError.localizedDescription.contains("update_mask cannot be empty") {
        emptyMaskUpdates += 1
        return
      }
    }
    failedUpdates += 1
  }

  override init() {
    emptyMaskUpdates = 0
    failedUpdates = 0
  }
}

Objective-C

#import "VehicleReporterListener.h"
#import <GoogleRidesharingDriver/GoogleRidesharingDriver.h>

@implementation VehicleReporterListener {
  NSInteger emptyMaskUpdates = 0;
  NSInteger failedUpdates = 0;
}

- (void)vehicleReporter:(GMTDVehicleReporter *)vehicleReporter
  didFailVehicleUpdate:(GMTDVehicleUpdate *)vehicleUpdate
             withError:(NSError *)error {
  for (NSError *underlyingError in error.underlyingErrors) {
    if ([underlyingError.localizedDescription containsString:@"update_mask cannot be empty"]) {
      emptyMaskUpdates += 1;
      return;
    }
  }
  failedUpdates += 1
}

@end