public static Tuple <EventingBasicConsumer, IModel> SubscribeConsumer(Action <object?, BasicDeliverEventArgs> callback,
string destination,
IConnection rabbitConn,
ILogger logger)
{
var channel = rabbitConn.CreateModel();
var finalDestination = string.Empty;
// subscription setup
channel.BasicQos(0, 1, false); // TODO: improve QoS setup
if (DestinationParsingTools.IsConsumerTopicDestination(destination))
{
finalDestination = ApplySetupTopic(destination, channel, logger);
}
else
{
finalDestination = ApplySetupQueue(destination, channel, logger);
}
logger.LogInformation("=^.^=: Appending new consumer to the channel...");
var consumer = new EventingBasicConsumer(channel);
consumer.Received += new EventHandler <BasicDeliverEventArgs>(callback);
channel.BasicConsume(queue: finalDestination, consumer: consumer);
logger.LogInformation("=^.^=: Waiting for messages...");
return(new Tuple <EventingBasicConsumer, IModel>(consumer, channel));
}
public static string ApplySetupTopic(string destination, IModel channel, ILogger logger)
{
logger.LogInformation("=^.^=: Applying setup for topics...");
var(consumerQueueName, topicName) = DestinationParsingTools
.ParseConsumerTopicDestination(destination);
// requires a fanout exchange creation
channel.ExchangeDeclare(topicName, ExchangeType.Fanout, true);
channel.QueueDeclare(consumerQueueName, true, false, false);
channel.QueueBind(consumerQueueName, topicName, topicName);
// for topic consumers -> destination is changed to /topicQ/TopicName/ConsumerName-
return(consumerQueueName);
}
public static void Send(byte[] body, IBasicProperties headers, string destination, IModel channel)
{
if (DestinationParsingTools.IsTopicDestination(destination))
{
channel.ExchangeDeclare(destination, ExchangeType.Fanout, true);
channel.BasicPublish(
exchange: destination, // fanout for the queue
routingKey: "", // no routing key for fanout exchanges
mandatory: true,
basicProperties: headers,
body: body);
}
else
{
channel.QueueDeclare(destination, true, false, false);
channel.BasicPublish(exchange: "", // queues -> default exchange handles it
routingKey: destination,
mandatory: true,
basicProperties: headers,
body: body);
}
}