/// <summary>
/// Adds the given device and assigned keys to the underlying repositories
/// </summary>
/// <param name="device">Device to add to repositories</param>
/// <param name="securityKeys">Keys to assign to the device</param>
/// <returns>Device that was added to the device registry</returns>
private async Task <DeviceModel> AddDeviceToRepositoriesAsync(DeviceModel device, SecurityKeys securityKeys)
{
DeviceModel registryRepositoryDevice = null;
ExceptionDispatchInfo capturedException = null;
// if an exception happens at this point pass it up the stack to handle it
// (Making this call first then the call against the Registry removes potential issues
// with conflicting rollbacks if the operation happens to still be in progress.)
await _iotHubRepository.AddDeviceAsync(device, securityKeys);
try
{
registryRepositoryDevice = await _deviceRegistryCrudRepository.AddDeviceAsync(device);
}
catch (Exception ex)
{
// grab the exception so we can attempt an async removal of the device from the IotHub
capturedException = ExceptionDispatchInfo.Capture(ex);
}
//Create a device in table storage if it is a simulated type of device
//and the document was stored correctly without an exception
bool isSimulatedAsBool = false;
try
{
isSimulatedAsBool = (bool)device.IsSimulatedDevice;
}
catch (InvalidCastException ex)
{
Trace.TraceError("The IsSimulatedDevice property was in an invalid format. Exception Error Message: {0}", ex.Message);
}
if (capturedException == null && isSimulatedAsBool)
{
try
{
await _virtualDeviceStorage.AddOrUpdateDeviceAsync(new InitialDeviceConfig()
{
DeviceId = device.DeviceProperties.DeviceID,
HostName = _configProvider.GetConfigurationSettingValue("iotHub.HostName"),
Key = securityKeys.PrimaryKey
});
}
catch (Exception ex)
{
//if we fail adding to table storage for the device simulator just continue
Trace.TraceError("Failed to add simulated device : {0}", ex.Message);
}
}
// Since the rollback code runs async and async code cannot run within the catch block it is run here
if (capturedException != null)
{
// This is a lazy attempt to remove the device from the Iot Hub. If it fails
// the device will still remain in the Iot Hub. A more robust rollback may be needed
// in some scenarios.
await _iotHubRepository.TryRemoveDeviceAsync(device.DeviceProperties.DeviceID);
capturedException.Throw();
}
return(registryRepositoryDevice);
}
