paho.mqtt-sn.embedded-c/MQTTSNGateway/src/MQTTSNGWAdapter.cpp

/**************************************************************************************
 * Copyright (c) 2016, Tomoaki Yamaguchi
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 *
 * The Eclipse Public License is available at
 *    http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 *   http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *    Tomoaki Yamaguchi - initial API and implementation and/or initial documentation
 **************************************************************************************/
#include "Timer.h"
#include "MQTTSNGWDefines.h"
#include "MQTTSNGateway.h"
#include "MQTTSNGWAdapter.h"
#include "SensorNetwork.h"
#include "MQTTSNGWProcess.h"
#include "MQTTSNGWClient.h"

#include <string.h>
using namespace MQTTSNGW;


/*=====================================
     Class Adapter
 =====================================*/
Adapter:: Adapter(Gateway* gw)
{
	_gateway = gw;
	_proxy = new Proxy(gw);
	_proxySecure = new Proxy(gw);
}

Adapter::~Adapter(void)
{
    if (  _proxy )
    {
        delete _proxy;
    }

    if (  _proxySecure )
   {
	   delete _proxySecure;
   }
}


void Adapter::setup(const char* adpterName, AdapterType adapterType)
{
    _isSecure = false;
    if ( _gateway->hasSecureConnection() )
    {
		_isSecure = true;
    }

    MQTTSNString id = MQTTSNString_initializer;
	MQTTSNString idSecure = MQTTSNString_initializer;

	string name = string(adpterName);
	id.cstring = const_cast<char*>(name.c_str());
	string nameSecure = string(adpterName) + "-S";
	idSecure.cstring = const_cast<char*>(nameSecure.c_str());

	Client*  client = _gateway->getClientList()->createClient(0, &id, true, false, TRANSPEARENT_TYPE);
	setClient(client, false);
	client->setAdapterType(adapterType);

	client = _gateway->getClientList()->createClient(0, &idSecure, true, true, TRANSPEARENT_TYPE);
	setClient(client, true);
	client->setAdapterType(adapterType);
}


Client* Adapter::getClient(SensorNetAddress* addr)
{
	Client* client = _gateway->getClientList()->getClient(addr);
	if ( !client )
	{
		return nullptr;
	}
	else if ( client->isQoSm1() )
	{
		return client;
	}
	else
	{
		return nullptr;
	}
}

const char*  Adapter::getClientId(SensorNetAddress* addr)
{
    Client* client = getClient(addr);
    if ( !client )
    {
    	return nullptr;
    }
    else if ( client->isQoSm1() )
    {
    	return client->getClientId();
    }
    else
    {
    	return nullptr;
    }
}

bool Adapter::isSecure(SensorNetAddress* addr)
{
	Client* client = getClient(addr);
	if ( !client )
	{
		return false;
	}
	else if ( client->isSecureNetwork() )
	{
		return true;
	}
	else
	{
		return false;
	}
}

void Adapter::setClient(Client* client, bool secure)
{
    if ( secure )
    {
        _clientSecure = client;
    }
    else
    {
        _client = client;
    }
}

Client* Adapter::getClient(void)
{
    return _client;
}

Client* Adapter::getSecureClient(void)
{
    return _clientSecure;
}

void Adapter::checkConnection(void)
{
    _proxy->checkConnection(_client);

    if ( _isSecure )
    {
        _proxySecure->checkConnection(_clientSecure);
    }
}

void Adapter::send(MQTTSNPacket* packet, Client* client)
{
    Proxy* proxy = _proxy;
    if ( client->isSecureNetwork() && !_isSecure )
    {
        if ( _isSecure )
        {
            proxy = _proxySecure;
        }
        else
        {
            WRITELOG("%s %s  No Secure connections %s 's packet is discarded.%s\n", ERRMSG_HEADER, client->getClientId() , ERRMSG_FOOTER);
            return;
        }
    }

    proxy->recv(packet, client);

}

void Adapter::resetPingTimer(bool secure)
{
    if ( secure )
    {
    	_proxySecure->resetPingTimer();
    }
    else
    {
    	_proxy->resetPingTimer();
    }
}

bool Adapter::isActive(void)
{
    return _isActive;
}

void Adapter::savePacket(Client* client, MQTTSNPacket* packet)
{
	if ( client->isSecureNetwork())
	{
		_proxySecure->savePacket(client, packet);
	}
	else
	{
		_proxy->savePacket(client, packet);
	}
}


Client* Adapter::getAdapterClient(Client* client)
{
	if ( client->isSecureNetwork() )
	{
		return _client;
	}
	else
	{
		return _client;
	}
}

/*=====================================
     Class Proxy
 =====================================*/
Proxy::Proxy(Gateway* gw)
{
	_gateway = gw;
	_suspendedPacketEventQue = new EventQue();
}
Proxy::~Proxy(void)
{
	if ( _suspendedPacketEventQue )
	{
		delete _suspendedPacketEventQue;
	}
}

void Proxy::checkConnection(Client* client)
{
    if ( client->isDisconnect()  || ( client->isConnecting() && _responseTimer.isTimeup()) )
    {
        client->connectSended();
        _responseTimer.start(QOSM1_PROXY_RESPONSE_DURATION * 1000UL);
        MQTTSNPacket_connectData options = MQTTSNPacket_connectData_initializer;
        options.clientID.cstring = client->getClientId();
        options.duration = QOSM1_PROXY_KEEPALIVE_DURATION;

        MQTTSNPacket* packet = new MQTTSNPacket();
        packet->setCONNECT(&options);
        Event* ev = new Event();
        ev->setClientRecvEvent(client, packet);
        _gateway->getPacketEventQue()->post(ev);
    }
    else if (  (client->isActive() && _keepAliveTimer.isTimeup() ) || (_isWaitingResp  && _responseTimer.isTimeup() ) )
    {
            MQTTSNPacket* packet = new MQTTSNPacket();
            MQTTSNString clientId = MQTTSNString_initializer;
            packet->setPINGREQ(&clientId);
            Event* ev = new Event();
            ev->setClientRecvEvent(client, packet);
            _gateway->getPacketEventQue()->post(ev);
            _responseTimer.start(QOSM1_PROXY_RESPONSE_DURATION * 1000UL);
            _isWaitingResp = true;

            if ( ++_retryCnt > QOSM1_PROXY_MAX_RETRY_CNT )
            {
                client->disconnected();
            }
            resetPingTimer();
    }
}


void Proxy::resetPingTimer(void)
{
    _keepAliveTimer.start(QOSM1_PROXY_KEEPALIVE_DURATION * 1000UL);
}

void Proxy::recv(MQTTSNPacket* packet, Client* client)
{
    if ( packet->getType() == MQTTSN_CONNACK )
    {
       if ( packet->isAccepted() )
       {
            _responseTimer.stop();
            _retryCnt = 0;
            resetPingTimer();
            sendSuspendedPacket();
       }
    }
    else if ( packet->getType() == MQTTSN_PINGRESP )
    {
        _isWaitingResp = false;
        _responseTimer.stop();
         _retryCnt = 0;
         resetPingTimer();
    }
    else if ( packet->getType() == MQTTSN_DISCONNECT )
    {
        // blank
    }
}

void Proxy::savePacket(Client* client, MQTTSNPacket* packet)
{
	MQTTSNPacket* pk = new MQTTSNPacket(*packet);
	Event* ev = new Event();
	ev->setClientRecvEvent(client, pk);
	_suspendedPacketEventQue->post(ev);
}

void Proxy::sendSuspendedPacket(void)
{
	while ( _suspendedPacketEventQue->size() )
	{
		Event* ev = _suspendedPacketEventQue->wait();
		_gateway->getPacketEventQue()->post(ev);
	}
}