public async Task <TrafficSegmentConfiguration> GetConfiguration()
{
var storageAccountConnection = _configurationReader.GetConfigValue <string>("STORAGE_CONNECTION_STRING", true);
var segmentId = _configurationReader.GetConfigValue <string>("SEGMENT_ID", true);
var storageAccount = CloudStorageAccount.Parse(storageAccountConnection);
var blobClient = storageAccount.CreateCloudBlobClient();
var configBlob = blobClient.GetContainerReference("traffic-config").GetBlockBlobReference("segment-configs.json");
var configText = await configBlob.DownloadTextAsync();
var segmentConfigs = JsonConvert.DeserializeObject <List <TrafficSegmentConfiguration> >(configText);
return(segmentConfigs.FirstOrDefault(c =>
c.SegmentId.Equals(segmentId, StringComparison.InvariantCultureIgnoreCase)));
}
public Task <TrafficSegmentConfiguration> GetConfiguration()
{
return(Task.FromResult(new TrafficSegmentConfiguration
{
SegmentId = _configurationReader.GetConfigValue <string>("SEGMENT_ID", true),
NumberOfLanes = _configurationReader.GetConfigValue("SEGMENT_LANE_COUNT", false, 3),
AverageCarsPerMinute = _configurationReader.GetConfigValue("SEGMENT_AVG_CARS_PER_MINUTE", false, 60),
SpeedLimit = _configurationReader.GetConfigValue("SEGMENT_SPEED_LIMIT", false, 120),
RushHours = GetRushHours(),
CameraDistance = _configurationReader.GetConfigValue("SEGMENT_CAMERA_DISTANCE", false, 2000),
SpeedingPercentage = _configurationReader.GetConfigValue("SEGMENT_SPEEDING_PERCENTAGE", false, 2),
MinSpeed = _configurationReader.GetConfigValue("SEGMENT_MIN_SPEED", false, 10),
MaxSpeed = _configurationReader.GetConfigValue("SEGMENT_MAX_SPEED", false, 180)
}));
}
public async Task <IEventTransmitter> CreateTransmitter(string segmentId, CameraType cameraId)
{
try
{
return(new IoTEdgeModuleTransmitter(_configurationReader.GetConfigValue("EDGE_MODULE_OUTPUT", false, cameraId.ToString())));
}
catch (Exception e)
{
_logger.Error(e, $"An error occurred when trying to create iot edge transmitter: {e.Message}");
throw;
}
}
public Task <IEventTransmitter> CreateTransmitter(string segmentId, CameraType cameraId)
{
var configuredColor = _configurationReader.GetConfigValue <string>($"CONSOLE_{cameraId.ToString().ToUpper().Replace("-", "")}_COLOR", false);
if (!Enum.TryParse(configuredColor, true, out ConsoleColor consoleColor))
{
consoleColor = cameraId == CameraType.Camera1 ? ConsoleColor.Green : ConsoleColor.Red;
}
return(Task.FromResult <IEventTransmitter>(new ConsoleTransmitter
{
ConsoleColor = consoleColor
}));
}
public async Task Run(CancellationToken cancellationToken)
{
SimulatedClock.Init(_simulationSettings.TimeSimulationAccelerator);
var segmentId = _configurationReader.GetConfigValue <string>("SEGMENT_ID", true);
var startCameraEventTransmitter = await _transmitterConfigurator.CreateTransmitter(segmentId, CameraType.Camera1);
var endCameraEventTransmitter = await _transmitterConfigurator.CreateTransmitter(segmentId, CameraType.Camera2);
var segmentConfiguration = await _configurator.GetConfiguration();
if (segmentConfiguration == null)
{
_logger.Error($"The segment configuration was not found and resulted to null");
return;
}
if (string.IsNullOrEmpty(segmentConfiguration.SegmentId))
{
segmentConfiguration.SegmentId = segmentId;
}
var segmentSituation = new TrafficSegmentSituation(_configurator, segmentConfiguration);
var random = new Random();
// Initialize transmitters
try
{
while (!cancellationToken.IsCancellationRequested)
{
segmentSituation.Resimulate(random);
var releaseInterval = TimeSpan.FromMilliseconds(Convert.ToInt32(60000 / segmentSituation.AverageCarsPerMinute)); // replace with function
var currentMinute = SimulatedClock.Time.Minute;
while (SimulatedClock.Time.Minute == currentMinute)
{
cancellationToken.ThrowIfCancellationRequested();
Task.Factory.StartNew(() => MakeOneCarDrive(random, segmentConfiguration, segmentSituation, startCameraEventTransmitter, endCameraEventTransmitter, cancellationToken), cancellationToken);
await Task.Delay(releaseInterval, cancellationToken);
}
}
}
catch (TaskCanceledException)
{ }
catch (Exception ex)
{
_logger.Error(ex, "Error happened in the simulator: " + ex.ToString());
}
}
public async Task <TrafficSegmentConfiguration> GetConfiguration()
{
_deviceConnectionString = ConfigurationCache.GetValue("deviceConnectionString");
_deviceClient = DeviceClient.CreateFromConnectionString(_deviceConnectionString);
await _deviceClient.SetDesiredPropertyUpdateCallbackAsync(TwinPropertiesChanged, null);
var iotHubOwnerConnectionString = _configurationReader.GetConfigValue <string>("IOTHUB_OWNER_CONNECTIONSTRING", true);
try
{
var twin = await _deviceClient.GetTwinAsync();
return(GetConfigurationFromTwin(twin.Properties.Desired));
}
catch (Exception e)
{
_logger.Error(e, $"An error occurred when trying read device on IoT Hub: {e.Message}");
throw;
}
}
public async Task <IEventTransmitter> CreateTransmitter(string segmentId, CameraType cameraId)
{
var iotHubOwnerConnectionString = _configurationReader.GetConfigValue <string>("IOTHUB_OWNER_CONNECTIONSTRING", true);
try
{
var policy = Policy
.Handle <TimeoutException>()
.Or <DeviceMessageLockLostException>()
.Or <IotHubCommunicationException>()
.Or <IotHubThrottledException>()
.Or <ServerBusyException>()
.WaitAndRetryAsync(5, retryAttempt =>
TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)),
(exception, span, retryCount, context) => { _logger.Warn(exception, $"Retry {retryCount}/{5} sending to IoT Hub, because of exception {exception}"); });
// Retry maximum 5 times with exponential backoff for the above exceptions
return(await policy.ExecuteAsync(async() =>
{
var iotHubServiceClient = RegistryManager.CreateFromConnectionString(iotHubOwnerConnectionString);
string deviceId = $"{segmentId}-{cameraId}";
var camDevice = await iotHubServiceClient.GetDeviceAsync(deviceId)
?? await iotHubServiceClient.AddDeviceAsync(new Device(deviceId));
var deviceConnectionString =
$"HostName={GetIoTHubUri(iotHubOwnerConnectionString)};DeviceId={deviceId};SharedAccessKey={camDevice.Authentication.SymmetricKey.PrimaryKey}";
if (cameraId == CameraType.Camera1)
{
ConfigurationCache.CacheValue("deviceConnectionString", deviceConnectionString);
}
return new IoTHubTransmitter(deviceConnectionString);
}));
}
catch (Exception e)
{
_logger.Error(e, $"An error occurred when trying read device on IoT Hub: {e.Message}");
throw;
}
}
