/// <inheritdoc />
public async Task Start(RequestDelegate requestDelegate, CancellationToken cancellationToken)
{
await _communication.Init();
_communication.CreateBasicConsumer(async(_, args) =>
{
try
{
_log.LogTrace($"Incoming request");
if (cancellationToken.IsCancellationRequested)
{
_log.LogTrace("Cancellation token call. {queueName}", args.RoutingKey);
_communication.Dispose();
return;
}
_log.LogTrace("Parsing request");
var features = new FeatureCollection();
features.Set(new ItemsFeature());
var context = await _converter.Parse(args, features);
if (context != null)
{
await requestDelegate(context);
await _responseProcessed.Handle(args, context);
}
else
{
await _communication.Ack(args);
await _communication.SendError(new BasicDeliverEventArgs
{
BasicProperties = args.BasicProperties,
Exchange = args.Exchange,
Body = args.Body
});
}
}
catch (Exception e)
{
_log.LogError(e, "Error processing message");
args.BasicProperties.Headers.TryAddToLowerCase("exception", e.ToString());
await _communication.SendException(args);
}
});
}
public async Task Handle(BasicDeliverEventArgs requestArgs, HttpContext context)
{
var request = context.Request;
var response = context.Response;
var requestProps = requestArgs.BasicProperties;
_log.LogInformation("{route} response status {status}", requestArgs.RoutingKey, response.StatusCode);
if (response.StatusCode >= 500)
{
_log.LogInformation("Response Status {status}. Retry", response.StatusCode);
var config = response.Headers.ParseRepeat() ?? request.Headers.ParseRepeat();
if (config != null)
{
if (await _communication.Retry(requestArgs, config))
{
return;
}
}
}
var basicProperties = _communication.CreateBasicProperties()
.CreateBasicPropertiesResponse(requestArgs.BasicProperties, context.Request, response);
if (requestProps.ReplyTo == null)
{
if (response.StatusCode >= 400)
{
var bodyTask = new StreamReader(response.Body).ReadToEndAsync();
var errorArgs = new BasicDeliverEventArgs
{
Body = requestArgs.Body,
BasicProperties = basicProperties
};
errorArgs.BasicProperties.Expiration = _errorExpiration.ToString();
errorArgs.BasicProperties.Headers.Add("responseUid", context.TraceIdentifier);
_log.LogTrace("Response {uid}:{response}", context.TraceIdentifier, await bodyTask);
await _communication.SendError(errorArgs);
}
await _communication.Ack(requestArgs);
return;
}
var address = requestProps.ReplyToAddress;
var args = new BasicDeliverEventArgs
{
RoutingKey = address.RoutingKey,
Body = await response.Body.ReadAllBytesAsync(),
BasicProperties = basicProperties,
Exchange = address.ExchangeName
};
_log.LogTrace("Response. exchange: {exchange} route: {queue}", address.ExchangeName, args.RoutingKey);
try
{
await _communication.Send(args)
.ContinueWith(task =>
{
if (task.Exception != null)
{
_log.LogError(task.Exception, $"Error send message exchange: {address.ExchangeName}, routing {args.RoutingKey}");
_communication.SendError(args);
}
else
{
_communication.Ack(requestArgs);
}
});
}
catch (Exception e)
{
_log.LogError(e, "Error send response message");
}
_log.LogTrace("Response. exchange: {exchange} route: {queue} sended", address.ExchangeName, args.RoutingKey);
}