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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* 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., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include <unistd.h>
#include <string.h>
#include <net/portlist.h>
#include <util/log.h>
#include <util/error.h>
#include <torrent/globals.h>
#include <torrent/bnode.h>
#include <torrent/bdecoder.h>
#include <torrent/bencoder.h>
#include <ksocketdevice.h>
#include "rpcserver.h"
#include "rpccall.h"
#include "rpcmsg.h"
#include "kbucket.h"
#include "node.h"
#include "dht.h"
using namespace KNetwork;
using namespace bt;
namespace dht
{
RPCServer::RPCServer(DHT* dh_table,Uint16 port,QObject *parent) : QObject(parent),dh_table(dh_table),next_mtid(0),port(port)
{
sock = new KDatagramSocket(this);
sock->setBlocking(false);
sock->setAddressReuseable(true);
}
RPCServer::~RPCServer()
{
bt::Globals::instance().getPortList().removePort(port,net::UDP);
sock->close();
calls.setAutoDelete(true);
calls.clear();
call_queue.setAutoDelete(true);
call_queue.clear();
}
void RPCServer::start()
{
sock->setBlocking(true);
if (!sock->bind(QString::null,QString::number(port)))
{
Out(SYS_DHT|LOG_IMPORTANT) << "DHT: Failed to bind to UDP port " << port << " for DHT" << endl;
}
else
{
bt::Globals::instance().getPortList().addNewPort(port,net::UDP,true);
}
sock->setBlocking(false);
connect(sock,SIGNAL(readyRead()),this,SLOT(readPacket()));
}
void RPCServer::stop()
{
bt::Globals::instance().getPortList().removePort(port,net::UDP);
sock->close();
}
static void PrintRawData(const QByteArray & data)
{
QString tmp;
for (Uint32 i = 0;i < data.size();i++)
{
char c = QChar(data[i]).latin1();
if (!QChar(data[i]).isPrint() || c == 0)
tmp += '#';
else
tmp += c;
}
Out(SYS_DHT|LOG_DEBUG) << tmp << endl;
}
void RPCServer::readPacket()
{
if (sock->bytesAvailable() == 0)
{
Out(SYS_DHT|LOG_NOTICE) << "0 byte UDP packet " << endl;
// KDatagramSocket wrongly handles UDP packets with no payload
// so we need to deal with it oursleves
int fd = sock->socketDevice()->socket();
char tmp;
read(fd,&tmp,1);
return;
}
KDatagramPacket pck = sock->receive();
/*
Out() << "RPCServer::readPacket" << endl;
PrintRawData(pck.data());
*/
BNode* n = 0;
try
{
// read and decode the packet
BDecoder bdec(pck.data(),false);
n = bdec.decode();
if (!n || n->getType() != BNode::DICT)
{
delete n;
return;
}
// try to make a RPCMsg of it
MsgBase* msg = MakeRPCMsg((BDictNode*)n,this);
if (msg)
{
msg->setOrigin(pck.address());
msg->apply(dh_table);
// erase an existing call
if (msg->getType() == RSP_MSG && calls.contains(msg->getMTID()))
{
// delete the call, but first notify it off the response
RPCCall* c = calls.find(msg->getMTID());
c->response(msg);
calls.erase(msg->getMTID());
c->deleteLater();
doQueuedCalls();
}
delete msg;
}
}
catch (bt::Error & err)
{
Out(SYS_DHT|LOG_IMPORTANT) << "Error happened during parsing : " << err.toString() << endl;
}
delete n;
if (sock->bytesAvailable() > 0)
readPacket();
}
void RPCServer::send(const KNetwork::KSocketAddress & addr,const QByteArray & msg)
{
sock->send(KNetwork::KDatagramPacket(msg,addr));
}
RPCCall* RPCServer::doCall(MsgBase* msg)
{
Uint8 start = next_mtid;
while (calls.contains(next_mtid))
{
next_mtid++;
if (next_mtid == start) // if this happens we cannot do any calls
{
// so queue the call
RPCCall* c = new RPCCall(this,msg,true);
call_queue.append(c);
Out(SYS_DHT|LOG_NOTICE) << "Queueing RPC call, no slots available at the moment" << endl;
return c;
}
}
msg->setMTID(next_mtid++);
sendMsg(msg);
RPCCall* c = new RPCCall(this,msg,false);
calls.insert(msg->getMTID(),c);
return c;
}
void RPCServer::sendMsg(MsgBase* msg)
{
QByteArray data;
msg->encode(data);
send(msg->getDestination(),data);
// PrintRawData(data);
}
void RPCServer::timedOut(Uint8 mtid)
{
// delete the call
RPCCall* c = calls.find(mtid);
if (c)
{
dh_table->timeout(c->getRequest());
calls.erase(mtid);
c->deleteLater();
}
doQueuedCalls();
}
void RPCServer::doQueuedCalls()
{
while (call_queue.count() > 0 && calls.count() < 256)
{
RPCCall* c = call_queue.first();
call_queue.removeFirst();
while (calls.contains(next_mtid))
next_mtid++;
MsgBase* msg = c->getRequest();
msg->setMTID(next_mtid++);
sendMsg(msg);
calls.insert(msg->getMTID(),c);
c->start();
}
}
const RPCCall* RPCServer::findCall(Uint8 mtid) const
{
return calls.find(mtid);
}
void RPCServer::ping(const dht::Key & our_id,const KNetwork::KSocketAddress & addr)
{
Out(SYS_DHT|LOG_NOTICE) << "DHT: pinging " << addr.nodeName() << endl;
PingReq* pr = new PingReq(our_id);
pr->setOrigin(addr);
doCall(pr);
}
}
#include "rpcserver.moc"
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