Increase MaxConcurrentRelaysPerRequest and improve log (#482)

- Add amount of requests on the payload to the log.
- Increase MaxConcurrentRelaysPerRequest to 5.5k

Author: oten91

protocol/shannon/context.go

@@ -46,7 +46,7 @@ const maxEndpointPayloadLenForLogging = 100
 // MaxConcurrentRelaysPerRequest limits the number of concurrent relay goroutines per request.
 // This prevents DoS attacks via large batch requests that could spawn unbounded goroutines.
 // TODO_IMPROVE: Make this configurable via gateway settings.
-const MaxConcurrentRelaysPerRequest = 10
+const MaxConcurrentRelaysPerRequest = 5500
 
 // requestContext provides all the functionality required by the gateway package
 // for handling a single service request.
@@ -164,7 +164,7 @@ func (rc *requestContext) HandleServiceRequest(payloads []protocol.Payload) ([]p
 	}
 
 	if len(payloads) > MaxConcurrentRelaysPerRequest {
-		response, err := rc.handleInternalError(fmt.Errorf("HandleServiceRequest: batch of payloads larger than allowed: %d", MaxConcurrentRelaysPerRequest))
+		response, err := rc.handleInternalError(fmt.Errorf("HandleServiceRequest: batch of payloads larger than allowed: %d, received: %d ", MaxConcurrentRelaysPerRequest, len(payloads)))
 		return []protocol.Response{response}, err
 	}