/// <summary>
/// Analyze payload of IoTHub message, adding timestamp and related sequence numbers into temporary
/// </summary>
/// <param name="arg"></param>
/// <returns>Task that run until token is canceled</returns>
private Task Client_ProcessEventAsync(ProcessEventArgs arg)
{
var eventReceivedTimestamp = DateTime.UtcNow;
// Check if already stopped.
if (_cancellationTokenSource == null)
{
_logger.LogWarning("Received Events but nothing to do, because already stopped");
return(Task.CompletedTask);
}
if (!arg.HasEvent)
{
_logger.LogWarning("Received partition event without content");
return(Task.CompletedTask);
}
var body = arg.Data.Body.ToArray();
var content = Encoding.UTF8.GetString(body);
dynamic json = JsonConvert.DeserializeObject(content);
var valueChangesCount = 0;
// TODO build variant that works with PubSub
foreach (dynamic entry in json)
{
DateTime entrySourceTimestamp;
string entryNodeId = null;
object entryValue;
try
{
entrySourceTimestamp = (DateTime)entry.Value.SourceTimestamp;
entryNodeId = entry.NodeId;
entryValue = entry.Value.Value;
}
catch (Exception ex)
{
_logger.LogError(ex, "Could not read sequence number, nodeId and/or timestamp from " +
"message. Please make sure that publisher is running with samples format and with " +
"--fm parameter set.");
continue;
}
// Feed data to checkers.
_missingTimestampsChecker.ProcessEvent(entryNodeId, entrySourceTimestamp, entryValue);
_messageProcessingDelayChecker.ProcessEvent(entrySourceTimestamp, eventReceivedTimestamp);
_messageDeliveryDelayChecker.ProcessEvent(entrySourceTimestamp, arg.Data.EnqueuedTime.UtcDateTime);
_valueChangeCounterPerNodeId.ProcessEvent(entryNodeId, entrySourceTimestamp, entryValue);
_missingValueChangesChecker.ProcessEvent(entrySourceTimestamp);
_incrementalIntValueChecker.ProcessEvent(entryNodeId, entryValue);
Interlocked.Increment(ref _totalValueChangesCount);
valueChangesCount++;
}
_logger.LogDebug("Received {NumberOfValueChanges} messages from IoT Hub, partition {PartitionId}.",
valueChangesCount, arg.Partition.PartitionId);
return(Task.CompletedTask);
}
/// <summary>
/// Feed the checkers for the Value Change (single Node value) within the reveived event
/// </summary>
/// <param name="nodeId">Identifeir of the data source.</param>
/// <param name="sourceTimestamp">Timestamp at the Data Source.</param>
/// <param name="enqueuedTimestamp">IoT Hub message enqueue timestamp.</param>
/// <param name="receivedTimestamp">Timestamp of arrival in the telemetry processor.</param>
/// <param name="value">The actual value of the data change.</param>
private void FeedDataCheckers(
string nodeId,
DateTime sourceTimestamp,
DateTime enqueuedTimestamp,
DateTime receivedTimestamp,
object value)
{
// OPC PLC contains bad fast and slow nodes that drop messages by design.
// We will ignore entries that do not have a value.
if (value is null)
{
return;
}
// Feed data to checkers.
_missingTimestampsChecker.ProcessEvent(nodeId, sourceTimestamp, value);
_messageProcessingDelayChecker.ProcessEvent(nodeId, sourceTimestamp, receivedTimestamp);
_messageDeliveryDelayChecker.ProcessEvent(nodeId, sourceTimestamp, enqueuedTimestamp);
_valueChangeCounterPerNodeId.ProcessEvent(nodeId, sourceTimestamp, value);
_missingValueChangesChecker.ProcessEvent(sourceTimestamp);
_incrementalIntValueChecker.ProcessEvent(nodeId, sourceTimestamp, value);
Interlocked.Increment(ref _totalValueChangesCount);
}