private async Task ListeningThread(IConnection connection, Func <IEvent, Task> handlerAsync)
{
canceller = new CancellationTokenSource();
retry:
try
{
if (this.channel != null)
{
throw new Exception("Exchange already open");
}
this.channel = connection.CreateModel();
this.channel.ExchangeDeclare(this.exchange, "fanout");
var queueName = this.channel.QueueDeclare().QueueName;
this.channel.QueueBind(queueName, this.exchange, String.Empty);
var consumer = new AsyncEventingBasicConsumer(this.channel);
consumer.Received += async(sender, e) =>
{
bool isEncrypted = e.BasicProperties.Headers != null && e.BasicProperties.Headers.Keys.Contains("Encryption") == true;
var stopwatch = new Stopwatch();
stopwatch.Start();
var properties = e.BasicProperties;
var acknowledgment = new Acknowledgement();
if (!isEncrypted && encryptionKey != null)
{
acknowledgment.Success = false;
acknowledgment.ErrorMessage = "Encryption Required";
}
else
{
try
{
byte[] body = e.Body;
if (isEncrypted)
{
body = SymmetricEncryptor.Decrypt(encryptionAlgorithm, encryptionKey, e.Body);
}
var rabbitMessage = RabbitMQCommon.Deserialize <RabbitMQEventMessage>(body);
if (rabbitMessage.Claims != null)
{
var claimsIdentity = new ClaimsIdentity(rabbitMessage.Claims.Select(x => new Claim(x[0], x[1])), "CQRS");
System.Threading.Thread.CurrentPrincipal = new ClaimsPrincipal(claimsIdentity);
}
await handlerAsync(rabbitMessage.Message);
stopwatch.Stop();
_ = Log.TraceAsync($"Received: {e.Exchange} {stopwatch.ElapsedMilliseconds}");
acknowledgment.Success = true;
}
catch (Exception ex)
{
stopwatch.Stop();
ex = ex.GetBaseException();
acknowledgment.Success = false;
acknowledgment.ErrorMessage = ex.Message;
_ = Log.TraceAsync($"Error: Received: {e.Exchange} {acknowledgment.ErrorMessage} {stopwatch.ElapsedMilliseconds}");
_ = Log.ErrorAsync(null, ex);
}
}
};
this.channel.BasicConsume(queueName, false, consumer);
}
catch (Exception ex)
{
_ = Log.ErrorAsync(ex);
if (!canceller.IsCancellationRequested)
{
if (channel != null)
{
channel.Close();
channel.Dispose();
channel = null;
}
await Task.Delay(retryDelay);
goto retry;
}
}
canceller.Dispose();
canceller = null;
if (channel != null)
{
channel.Close();
channel.Dispose();
channel = null;
}
IsOpen = false;
}