public Task OnMessage(Message theMessage)
{
Task returnTask;
try {
SyntheticMessageProcessor processor = new SyntheticMessageProcessor(_connectionString, _monitoringTopic, _logger);
Task messageTask = processor.OnMessage(theMessage);
returnTask = Task.WhenAll(new Task[] { messageTask });
} catch (MonitoringException mex) {
_logger.LogError($"ERROR - {mex.Message} {mex.StackTrace}");
returnTask = Task.FromException(mex);
} catch (Exception ex) {
_logger.LogWarning($"Error scenario found in monitored service - {ex.Message}");
string dataJSON = Encoding.UTF8.GetString(theMessage.Body);
MonitorMessage errorMessage = JsonConvert.DeserializeObject <MonitorMessage>(dataJSON);
errorMessage.AssociatedId = $"{errorMessage.AssociatedId}_DLQ";
if (ts is null)
{
ts = new SessionlessTopicSender(_connectionString, _monitoringTopic);
}
Task sendTask = ts.Send(JsonConvert.SerializeObject(errorMessage), theMessage.UserProperties["CollectionId"].ToString(), theMessage.UserProperties["Context"].ToString(), DateTime.MinValue, "SYNTHETIC_ERROR");
returnTask = Task.WhenAll(new Task[] { sendTask });
}
return(returnTask);
}
/// <summary>
/// Processes a synthetic message by forwarding it to a monitoring topic (e.g. monitoring.infrastructure.topic)
/// with eventType="LAST_SYNTHETIC_MESSAGE_PUBLISHED" to be monitored for arrival at monitoring endpoint
/// </summary>
/// <param name="servicebusConnectionStr">Azure Service Bus connection string</param>
/// <param name="monitoringTopic">Monitoring topic name to which synthetic messages should be forwarded</param>
/// <param name="log">Log to write errors and warnings</param>
public SyntheticMessageProcessor(string servicebusConnectionStr, string monitoringTopic, ILogger log) : base(log)
{
if (ts is null)
{
ts = new SessionlessTopicSender(servicebusConnectionStr, monitoringTopic, log);
}
if (_logger is null)
{
_logger = log;
}
}
