public void StartReceivingCommands(CommandReceivedCallback callback)
{
CheckDisposed();
var consumer = new EventingBasicConsumer(_channel);
_channel.BasicConsume(queue: QueueName,
autoAck: false,
consumerTag: "",
noLocal: false,
exclusive: false,
arguments: null,
consumer: consumer);
consumer.Received += (s, ea) =>
{
var body = ea.Body;
var props = ea.BasicProperties;
var replyProps = _channel.CreateBasicProperties();
replyProps.CorrelationId = props.CorrelationId;
_logger.LogInformation("Received command request with correlation id {0}", ea.BasicProperties.CorrelationId);
var message = Encoding.UTF8.GetString(body);
CommandResponseMessage response = null;
try
{
response = callback(new CommandRequestMessage(message, props.CorrelationId)).Result;
replyProps.Type = response.MessageType.ToString();
}
catch (Exception e)
{
var realException = e.InnerException;
if (realException is TargetInvocationException)
{
realException = realException.InnerException;
}
response = new CommandResponseMessage(realException.Message, realException.GetType().FullName,
props.CorrelationId);
replyProps.Type = realException.GetType().FullName;
}
finally
{
_channel.BasicPublish(exchange: "",
routingKey: props.ReplyTo,
mandatory: false,
basicProperties: replyProps,
body: response?.EncodeMessage());
_channel.BasicAck(deliveryTag: ea.DeliveryTag,
multiple: false);
}
};
}
public async Task Handle(object s, BasicDeliverEventArgs ea, CommandReceivedCallback callback)
{
var body = ea.Body;
var props = ea.BasicProperties;
var replyProps = _channel.CreateBasicProperties();
replyProps.CorrelationId = props.CorrelationId;
var message = Encoding.UTF8.GetString(body);
CommandResponseMessage response = null;
try
{
response = await callback(new CommandRequestMessage(message, props.CorrelationId));
replyProps.Type = response.MessageType.ToString();
}
catch (Exception e)
{
var realException = e.InnerException;
response = new CommandResponseMessage(realException.Message, realException.GetType().ToString(),
props.CorrelationId);
replyProps.Type = realException.GetType().ToString();
}
finally
{
_channel.BasicPublish(exchange: "",
routingKey: props.ReplyTo,
mandatory: false,
basicProperties: replyProps,
body: response?.EncodeMessage());
_channel.BasicAck(deliveryTag: ea.DeliveryTag,
multiple: false);
}
_log.LogInformation("Started listening for commands on queue {0} ", QueueName);
}