qkd-kms-queue-logic.cc

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2022 DOTFEESA www.tk.etf.unsa.ba
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author:  Miralem Mehic <miralem.mehic@ieee.org>
 *          Emir Dervisevic <emir.dervisevic@etf.unsa.ba>
 */
 
#include "ns3/log.h"
#include "ns3/pointer.h"
#include "ns3/object-factory.h"
#include "ns3/drop-tail-queue.h"
#include "ns3/qkd-kms-queue-logic.h"
 
namespace ns3 {
 
NS_LOG_COMPONENT_DEFINE ("QKDKMSQueueLogic");
 
NS_OBJECT_ENSURE_REGISTERED (QKDKMSQueueLogic);
 
TypeId QKDKMSQueueLogic::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::QKDKMSQueueLogic")
    .SetParent<Object> () 
    .AddConstructor<QKDKMSQueueLogic> ()
    .AddAttribute ("MaxSize", "The maximum number of packets accepted by this queue disc.",
                   UintegerValue (10),
                   MakeUintegerAccessor (&QKDKMSQueueLogic::m_maxSize),
                   MakeUintegerChecker<uint32_t> ()) 
    .AddAttribute ("NumberOfQueues", "The number of priority queues used.",
                   UintegerValue (3),
                   MakeUintegerAccessor (&QKDKMSQueueLogic::m_numberOfQueues),
                   MakeUintegerChecker<uint32_t> ()) 
    .AddTraceSource ("EnqueueKMS", "Enqueue a packet in the queue disc",
                     MakeTraceSourceAccessor (&QKDKMSQueueLogic::m_traceEnqueue),
                     "ns3::QueueItem::TracedCallback")
    .AddTraceSource ("DequeueKMS", "Dequeue a packet from the queue disc",
                     MakeTraceSourceAccessor (&QKDKMSQueueLogic::m_traceDequeue),
                     "ns3::QueueItem::TracedCallback")
    .AddTraceSource ("DropKMS", "Drop a packet from the queue disc",
                     MakeTraceSourceAccessor (&QKDKMSQueueLogic::m_traceDroped),
                     "ns3::QueueItem::TracedCallback")
    .AddTraceSource ("PacketsInQueue", "Number of packets currently stored in the queue disc",
                     MakeTraceSourceAccessor (&QKDKMSQueueLogic::m_nPackets),
                     "ns3::TracedValueCallback::Uint32")
  ;
  return tid;
}
 
QKDKMSQueueLogic::QKDKMSQueueLogic ()
{
  NS_LOG_FUNCTION (this);
 
  for (uint32_t i = 0; i < m_numberOfQueues; i++){
    std::vector<QKDKMSQueueEntry> nv;
    m_queues.push_back(nv);
  }
}
 
QKDKMSQueueLogic::~QKDKMSQueueLogic ()
{
  NS_LOG_FUNCTION (this);
}
 
bool
QKDKMSQueueLogic::Enqueue (QKDKMSQueueEntry item)
{ 
  NS_LOG_FUNCTION (this << m_nPackets << m_maxSize);
  
  if (m_nPackets >= m_maxSize)
  {
    m_traceDroped(item.httpMessage);
    NS_LOG_LOGIC ("Queue disc limit exceeded -- dropping packet");
    return false;
  }
 
  std::string payload = item.httpMessage.GetMessageBodyString();
  nlohmann::json jOpenConnectRequest;
 
  if(payload.length() > 0){
    try{
        jOpenConnectRequest = nlohmann::json::parse(payload);
    }catch(...) {
        NS_FATAL_ERROR( this << "JSON parse error!" << payload );
    }
  }
 
  uint32_t priority = 0;  
  if (jOpenConnectRequest.contains("QoS")) {
    if (jOpenConnectRequest["QoS"].contains("priority")){
      priority = jOpenConnectRequest["QoS"]["priority"]; 
    }
  }
 
  if(priority > m_numberOfQueues || priority < 0){ //Primitive validation of priority value
    priority = 0;
  }
  
  m_queues[priority].push_back(item);
  m_traceEnqueue(item.httpMessage);
  m_nPackets++;
  
  for (uint32_t i = 0; i < m_numberOfQueues; i++){
    NS_LOG_LOGIC ("Number of packets in queue " << i << ": " << m_queues[i].size() );
  }
 
  return true;
} 
 
QKDKMSQueueLogic::QKDKMSQueueEntry
QKDKMSQueueLogic::Dequeue (void)
{
  NS_LOG_FUNCTION (this << m_nPackets << m_maxSize);
 
  QKDKMSQueueEntry item;
  for (uint32_t i = 0; i < m_numberOfQueues; i++)
  {
    if (m_queues[i].size() > 0)
    {
      item = m_queues[i].back();
      m_queues[i].pop_back();
      m_traceDequeue(item.httpMessage); 
      m_nPackets--;
      NS_LOG_LOGIC ("Popped from queue " << i);
      NS_LOG_LOGIC ("Number of packets in queue " << i << ": " << m_queues[i].size());
      return item;
    }
  }
  
  NS_LOG_LOGIC ("Queue empty");
  return item;
} 
 
} // namespace ns3