protected virtual IModel CreateChannel(string channelName, string connectionName)
{
return(ConnectionPool
.Get(connectionName)
.CreateModel());
}
protected virtual async Task TryCreateChannelAsync()
{
await DisposeChannelAsync();
try
{
Channel = ConnectionPool
.Get(ConnectionName)
.CreateModel();
Channel.ExchangeDeclare(
exchange: Exchange.ExchangeName,
type: Exchange.Type,
durable: Exchange.Durable,
autoDelete: Exchange.AutoDelete,
arguments: Exchange.Arguments
);
if (!Exchange.DeadLetterExchangeName.IsNullOrWhiteSpace() &&
!Queue.DeadLetterQueueName.IsNullOrWhiteSpace())
{
Channel.ExchangeDeclare(
Exchange.DeadLetterExchangeName,
Exchange.Type,
Exchange.Durable,
Exchange.AutoDelete
);
Channel.QueueDeclare(
Queue.DeadLetterQueueName,
Queue.Durable,
Queue.Exclusive,
Queue.AutoDelete);
Queue.Arguments["x-dead-letter-exchange"] = Exchange.DeadLetterExchangeName;
Queue.Arguments["x-dead-letter-routing-key"] = Queue.DeadLetterQueueName;
Channel.QueueBind(Queue.DeadLetterQueueName, Exchange.DeadLetterExchangeName, Queue.DeadLetterQueueName);
}
var result = Channel.QueueDeclare(
queue: Queue.QueueName,
durable: Queue.Durable,
exclusive: Queue.Exclusive,
autoDelete: Queue.AutoDelete,
arguments: Queue.Arguments
);
var consumer = new AsyncEventingBasicConsumer(Channel);
consumer.Received += HandleIncomingMessageAsync;
Channel.BasicConsume(
queue: Queue.QueueName,
autoAck: false,
consumer: consumer
);
}
catch (Exception ex)
{
if (ex is OperationInterruptedException operationInterruptedException &&
operationInterruptedException.ShutdownReason.ReplyCode == 406 &&
operationInterruptedException.Message.Contains("arg 'x-dead-letter-exchange'"))
{
Exchange.DeadLetterExchangeName = null;
Queue.DeadLetterQueueName = null;
Queue.Arguments.Remove("x-dead-letter-exchange");
Queue.Arguments.Remove("x-dead-letter-routing-key");
Logger.LogWarning("Unable to bind the dead letter queue to an existing queue. You can delete the queue or add policy. See: https://www.rabbitmq.com/parameters.html");
}
Logger.LogException(ex, LogLevel.Warning);
await ExceptionNotifier.NotifyAsync(ex, logLevel : LogLevel.Warning);
}
}