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Publish telemetry in batch with retrying

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This commit is contained in:
Denis-Cosmin Nutiu 2019-12-05 22:40:24 +02:00
parent 88e62fa486
commit 1c522d5a61
1 changed files with 48 additions and 21 deletions
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57
NucuCar.Domain/Telemetry/TelemetryPublisherAzure.cs
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@ -74,40 +74,67 @@ namespace NucuCar.Domain.Telemetry
public override async Task PublishAsync(CancellationToken cancellationToken)
{
var data = GetTelemetry();
var messageString = JsonConvert.SerializeObject(data);
Logger?.LogDebug($"Telemetry message: {messageString}");
var message = new Message(Encoding.ASCII.GetBytes(messageString));
await PublishToCloudAsync(message, cancellationToken);
}
private Dictionary<string, object> GetTelemetry()
{
var data = new List<Dictionary<string, object>>();
foreach (var telemeter in RegisteredTelemeters)
{
var data = telemeter.GetTelemetryData();
if (data == null)
var telemetryData = telemeter.GetTelemetryData();
if (telemetryData == null)
{
Logger?.LogWarning($"Warning! Data for {telemeter.GetIdentifier()} is null!");
continue;
}
telemetryData["_id"] = telemeter.GetIdentifier();
data.Add(telemetryData);
}
var metadata = new Dictionary<string, object>
{
["source"] = TelemetrySource ?? nameof(TelemetryPublisherAzure),
["id"] = telemeter.GetIdentifier(),
["timestamp"] = DateTime.Now,
["data"] = data,
["data"] = data.ToArray()
};
await PublishViaMqtt(metadata, cancellationToken);
}
return metadata;
}
private async Task PublishViaMqtt(Dictionary<string, object> data, CancellationToken cancellationToken)
private async Task PublishToCloudAsync(Message message, CancellationToken cancellationToken, int maxRetries = 3)
{
var retry = 0;
while (retry < maxRetries)
{
if (cancellationToken.IsCancellationRequested)
{
Logger?.LogInformation("Stopping the AzureTelemetryPublisher, cancellation requested.");
await DeviceClient.CloseAsync(cancellationToken);
return;
Logger?.LogInformation("Publishing telemetry cancelled!");
break;
}
var messageString = JsonConvert.SerializeObject(data);
var message = new Message(Encoding.ASCII.GetBytes(messageString));
Logger?.LogDebug($"Telemetry message: {messageString}");
await DeviceClient.SendEventAsync(message, cancellationToken);
try
{
var cts = new CancellationTokenSource();
cts.CancelAfter(5000);
cts.Token.ThrowIfCancellationRequested();
/* Should throw OperationCanceledException on timeout or cancel. */
await DeviceClient.SendEventAsync(message, cts.Token);
break;
}
catch (OperationCanceledException e)
{
retry += 1;
Logger?.LogWarning($"Telemetry not sent! Retry {retry}.");
}
}
}
public override void Dispose()