private IModel CreateRetryConsumerChannel(string queueName, string routeKey, QueueConsumerMode type, bool bindConsumer)
{
if (!_rabbitMqClient.IsConnected)
{
_rabbitMqClient.TryConnect();
}
IDictionary <String, Object> arguments = new Dictionary <String, Object>();
arguments.Add("x-dead-letter-exchange", $"{BROKER_NAME}@{QueueConsumerMode.Fail.ToString()}");
arguments.Add("x-message-ttl", _messageTTL);
arguments.Add("x-dead-letter-routing-key", routeKey);
var channel = _rabbitMqClient.CreateModel();
var retryQueueName = $"{queueName}@{type.ToString()}";
//定义交换机
channel.ExchangeDeclare(exchange: $"{BROKER_NAME}@{type.ToString()}",
type: ExchangeType.Direct);
//定义队列
channel.QueueDeclare(retryQueueName, true, false, false, arguments);
var consumer = new EventingBasicConsumer(channel);
consumer.Received += async(model, ea) =>
{
var eventName = ea.RoutingKey;
await ProcessEvent(eventName, ea.Body, type, ea.BasicProperties, bindConsumer);
channel.BasicAck(ea.DeliveryTag, false);
};
if (bindConsumer)
{
channel.BasicQos(0, 1, false);
channel.BasicConsume(queue: retryQueueName,
autoAck: false,
consumer: consumer);
}
else
{
channel.Close();
}
return(channel);
}
private IModel CreateFailConsumerChannel(string queueName, QueueConsumerMode type, bool bindConsumer)
{
if (!_rabbitMqClient.IsConnected)
{
_rabbitMqClient.TryConnect();
}
var channel = _rabbitMqClient.CreateModel();
channel.ExchangeDeclare(exchange: $"{BROKER_NAME}@{type.ToString()}",
type: ExchangeType.Direct);
var failQueueName = $"{queueName}@{type.ToString()}";
channel.QueueDeclare(failQueueName, true, false, false, null);
var consumer = new EventingBasicConsumer(channel);
consumer.Received += async(model, ea) =>
{
var eventName = ea.RoutingKey;
await ProcessEvent(eventName, ea.Body, type, ea.BasicProperties, bindConsumer);
channel.BasicAck(ea.DeliveryTag, false);
};
if (bindConsumer)
{
channel.BasicQos(0, 1, false);
channel.BasicConsume(queue: failQueueName,
autoAck: false,
consumer: consumer);
}
else
{
channel.Close();
}
return(channel);
}
private async Task ProcessEvent(string eventName, byte[] body, QueueConsumerMode mode, IBasicProperties properties)
{
var message = Encoding.UTF8.GetString(body);
if (_subsManager.HasSubscriptionsForEvent(eventName))
{
var eventType = _subsManager.GetEventTypeByName(eventName);
var integrationEvent = JsonConvert.DeserializeObject(message, eventType);
var handlers = _subsManager.GetHandlersForEvent(eventName);
var concreteType = typeof(IIntegrationEventHandler <>).MakeGenericType(eventType);
foreach (var handlerfactory in handlers)
{
var handler = handlerfactory.DynamicInvoke();
long retryCount = 1;
try
{
var fastInvoker = GetHandler($"{concreteType.FullName}.Handle", concreteType.GetMethod("Handle"));
await(Task) fastInvoker(handler, new object[] { integrationEvent });
}
catch
{
if (!_persistentConnection.IsConnected)
{
_persistentConnection.TryConnect();
}
retryCount = GetRetryCount(properties);
using (var channel = _persistentConnection.CreateModel())
{
if (retryCount > _retryCount)
{
// 重试次数大于3次，则自动加入到死信队列
var rollbackCount = retryCount - _retryCount;
if (rollbackCount < _rollbackCount)
{
IDictionary <String, Object> headers = new Dictionary <String, Object>();
if (!headers.ContainsKey("x-orig-routing-key"))
{
headers.Add("x-orig-routing-key", GetOrigRoutingKey(properties, eventName));
}
retryCount = rollbackCount;
channel.BasicPublish(_exchanges[QueueConsumerMode.Fail], eventName, CreateOverrideProperties(properties, headers), body);
}
}
else
{
IDictionary <String, Object> headers = properties.Headers;
if (headers == null)
{
headers = new Dictionary <String, Object>();
}
if (!headers.ContainsKey("x-orig-routing-key"))
{
headers.Add("x-orig-routing-key", GetOrigRoutingKey(properties, eventName));
}
channel.BasicPublish(_exchanges[QueueConsumerMode.Retry], eventName, CreateOverrideProperties(properties, headers), body);
}
}
}
finally
{
var baseConcreteType = typeof(BaseIntegrationEventHandler <>).MakeGenericType(eventType);
if (handler.GetType().BaseType == baseConcreteType)
{
var context = new EventContext()
{
Content = integrationEvent,
Count = retryCount,
Type = mode.ToString()
};
var fastInvoker = GetHandler($"{baseConcreteType.FullName}.Handled", baseConcreteType.GetMethod("Handled"));
await(Task) fastInvoker(handler, new object[] { context });
}
}
}
}
}
private async Task ProcessEvent(string eventName, ReadOnlyMemory <byte> body, QueueConsumerMode type, IBasicProperties properties, bool bindConsumer)
{
var message = Encoding.UTF8.GetString(body.ToArray());
var eventType = _subscriptionsManager.GetEventTypeByName(eventName);
var integrationEvent = JsonConvert.DeserializeObject(message, eventType);
var handlers = _subscriptionsManager.GetHandlersForEvent(eventName);
var concreteType = typeof(IEventHandler <>).MakeGenericType(eventType);
foreach (var item in handlers)
{
var handler = item.DynamicInvoke();
long count = 1;
try
{
if (type == QueueConsumerMode.Normal || type == QueueConsumerMode.Retry)
{
var fastInvoker = GetHandler($"{concreteType.FullName}.Handle", concreteType.GetMethod("Handle"));
await(Task) fastInvoker(handler, new object[] { integrationEvent });
}
}
catch
{
if (!_rabbitMqClient.IsConnected)
{
_rabbitMqClient.TryConnect();
}
count = GetRetryCount(properties);
using (var channel = _rabbitMqClient.CreateModel())
{
if (count > _retryCount)
{
// 重试次数大于设置次数，则自动加入到死信队列
var rollbackCount = count - _retryCount;
if (rollbackCount <= _rollbackCount)
{
IDictionary <String, Object> headers = new Dictionary <String, Object>();
if (!bindConsumer)
{
return;
}
if (!headers.ContainsKey("x-orig-routing-key"))
{
headers.Add("x-orig-routing-key", GetOrigRoutingKey(properties, eventName));
}
channel.BasicPublish($"{BROKER_NAME}@{QueueConsumerMode.Fail.ToString()}", eventName,
CreateOverrideProperties(properties, headers), body);
}
}
else
{
if (!bindConsumer)
{
return;
}
IDictionary <String, Object> headers = properties.Headers ?? new Dictionary <String, Object>();
if (!headers.ContainsKey("x-orig-routing-key"))
{
headers.Add("x-orig-routing-key", GetOrigRoutingKey(properties, eventName));
}
channel.BasicPublish($"{BROKER_NAME}@{QueueConsumerMode.Retry.ToString()}", eventName,
CreateOverrideProperties(properties, headers), body);
}
}
}
finally
{
var baseConcreteType = typeof(BaseEventHandler <>).MakeGenericType(eventType);
if (handler.GetType().BaseType == baseConcreteType)
{
var context = new EventContext()
{
Content = integrationEvent,
Count = count,
Type = type.ToString()
};
switch (type)
{
case QueueConsumerMode.Normal:
case QueueConsumerMode.Retry:
{
var fastInvoker = GetHandler($"{baseConcreteType.FullName}.Handled", baseConcreteType.GetMethod("Handled"));
await(Task) fastInvoker(handler, new object[] { context });
break;
}
case QueueConsumerMode.Fail:
{
var fastInvoker = GetHandler($"{baseConcreteType.FullName}.FailHandler", baseConcreteType.GetMethod("FailHandler"));
await(Task) fastInvoker(handler, new object[] { context });
break;
}
}
}
}
}
}