private async Task <bool> HandleMessage(MethodInfo method, MessageHandlerBuilder messageHandlers, object actualMessage, ulong deliveryTag)
{
var retryCount = 0;
Retry:
try
{
method.Invoke(messageHandlers, new[] { actualMessage });
_channel.BasicAck(deliveryTag, false);
Console.WriteLine("Ack");
return(true);
}
catch (Exception ex)
{
if (retryCount < MaxRetryCount)
{
await Task.Delay(RetryDelay);
retryCount++;
//todo log retrying
goto Retry;
}
//send to dead.letter exchange
_channel.BasicNack(deliveryTag, false, false);
//todo log error
return(false);
}
}
private void DiscoverHandlers()
{
var serviceProvider = GetServiceProvider();
var messageHandlers = new MessageHandlerBuilder(serviceProvider);
var consumer = new EventingBasicConsumer(_channel);
consumer.Received += async(sender, message) =>
{
var props = message.BasicProperties;
var deliveryTag = message.DeliveryTag;
var headers = props.Headers;
if (!_typeMap.ContainsKey(props.Type) || !_typeMap.TryGetValue(props.Type, out Type actualMessageType))
{
return;
}
var actualMessage = GetSerializer().Deserialize(message.Body, actualMessageType);
var method = typeof(MessageHandlerBuilder).GetMethod("HandleMessagesAsync").MakeGenericMethod(actualMessage.GetType());
var(canHandle, errorMessage) = await HandleMessage(method, messageHandlers, headers, actualMessage, deliveryTag);
if (!canHandle)
{
SendToDeadLetterQueue(message.BasicProperties, message.Body);
}
};
lock (_channel)
{
_consumerTag = _channel.BasicConsume(consumer, _serviceQueue, false);
}
}
private async Task <(bool, string)> HandleMessage(MethodInfo method, MessageHandlerBuilder messageHandlers, IDictionary <string, object> headers, object actualMessage, ulong deliveryTag)
{
var retryCount = 0;
Retry:
try
{
await(Task) method.Invoke(messageHandlers, new[] { headers, actualMessage });
lock (_channel)
{
_channel.BasicAck(deliveryTag, false);
}
//Console.WriteLine("Ack");
return(true, null);
}
catch (Exception ex)
{
var body = JsonConvert.SerializeObject(actualMessage);
var message = $"Error while handle message: {actualMessage.GetType().FullName}\n{ex.Message}\n{ex.StackTrace}";
Console.WriteLine(message);
if (retryCount < MaxRetryCount)
{
await Task.Delay(RetryDelay);
retryCount++;
//todo log retrying
goto Retry;
}
lock (_channel)
{
//send to dead.letter exchange
_channel.BasicNack(deliveryTag, false, false);
}
//todo log error
return(false, message);
}
}
private void DiscoverHandlers()
{
var messageHandlers = new MessageHandlerBuilder(_serviceProvider);
var consumer = new EventingBasicConsumer(_channel);
consumer.Received += (sender, message) =>
{
var props = message.BasicProperties;
var actualMessageType = _typeMap[props.Type];
var actualMessage = _serializer.Deserialize(message.Body, actualMessageType);
typeof(MessageHandlerBuilder).GetMethod("HandleMessages")
.MakeGenericMethod(actualMessage.GetType()).Invoke(messageHandlers, new[] { actualMessage });
};
_consumerTag = _channel.BasicConsume(consumer, _serviceQueue, true);
}
private void DiscoverHandlers()
{
var messageHandlers = new MessageHandlerBuilder(GetServiceProvider());
var consumer = new EventingBasicConsumer(_channel);
consumer.Received += async(sender, message) =>
{
var props = message.BasicProperties;
var deliveryTag = message.DeliveryTag;
var actualMessageType = _typeMap[props.Type];
var actualMessage = GetSerializer().Deserialize(message.Body, actualMessageType);
var method = typeof(MessageHandlerBuilder).GetMethod("HandleMessages").MakeGenericMethod(actualMessage.GetType());
var success = await HandleMessage(method, messageHandlers, actualMessage, deliveryTag);
if (!success)
{
SendToDeadLetterQueue(message.BasicProperties, message.Body);
}
};
_consumerTag = _channel.BasicConsume(consumer, _serviceQueue, false);
}
