src/connection.cpp


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/*
Minetest-c55
Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser 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 "connection.h"
#include "main.h"
#include "serialization.h"
#include "log.h"
#include "porting.h"
#include "util/serialize.h"
#include "util/numeric.h"
#include "util/string.h"
#include "settings.h"

namespace con
{

static u16 readPeerId(u8 *packetdata)
{
	return readU16(&packetdata[4]);
}
static u8 readChannel(u8 *packetdata)
{
	return readU8(&packetdata[6]);
}

BufferedPacket makePacket(Address &address, u8 *data, u32 datasize,
		u32 protocol_id, u16 sender_peer_id, u8 channel)
{
	u32 packet_size = datasize + BASE_HEADER_SIZE;
	BufferedPacket p(packet_size);
	p.address = address;

	writeU32(&p.data[0], protocol_id);
	writeU16(&p.data[4], sender_peer_id);
	writeU8(&p.data[6], channel);

	memcpy(&p.data[BASE_HEADER_SIZE], data, datasize);

	return p;
}

BufferedPacket makePacket(Address &address, SharedBuffer<u8> &data,
		u32 protocol_id, u16 sender_peer_id, u8 channel)
{
	return makePacket(address, *data, data.getSize(),
			protocol_id, sender_peer_id, channel);
}

SharedBuffer<u8> makeOriginalPacket(
		SharedBuffer<u8> data)
{
	u32 header_size = 1;
	u32 packet_size = data.getSize() + header_size;
	SharedBuffer<u8> b(packet_size);

	writeU8(&b[0], TYPE_ORIGINAL);

	memcpy(&b[header_size], *data, data.getSize());

	return b;
}

core::list<SharedBuffer<u8> > makeSplitPacket(
		SharedBuffer<u8> data,
		u32 chunksize_max,
		u16 seqnum)
{
	// Chunk packets, containing the TYPE_SPLIT header
	core::list<SharedBuffer<u8> > chunks;
	
	u32 chunk_header_size = 7;
	u32 maximum_data_size = chunksize_max - chunk_header_size;
	u32 start = 0;
	u32 end = 0;
	u32 chunk_num = 0;
	do{
		end = start + maximum_data_size - 1;
		if(end > data.getSize() - 1)
			end = data.getSize() - 1;
		
		u32 payload_size = end - start + 1;
		u32 packet_size = chunk_header_size + payload_size;

		SharedBuffer<u8> chunk(packet_size);
		
		writeU8(&chunk[0], TYPE_SPLIT);
		writeU16(&chunk[1], seqnum);
		// [3] u16 chunk_count is written at next stage
		writeU16(&chunk[5], chunk_num);
		memcpy(&chunk[chunk_header_size], &data[start], payload_size);

		chunks.push_back(chunk);
		
		start = end + 1;
		chunk_num++;
	}
	while(end != data.getSize() - 1);

	u16 chunk_count = chunks.getSize();

	core::list<SharedBuffer<u8> >::Iterator i = chunks.begin();
	for(; i != chunks.end(); i++)
	{
		// Write chunk_count
		writeU16(&((*i)[3]), chunk_count);
	}

	return chunks;
}

core::list<SharedBuffer<u8> > makeAutoSplitPacket(
		SharedBuffer<u8> data,
		u32 chunksize_max,
		u16 &split_seqnum)
{
	u32 original_header_size = 1;
	core::list<SharedBuffer<u8> > list;
	if(data.getSize() + original_header_size > chunksize_max)
	{
		list = makeSplitPacket(data, chunksize_max, split_seqnum);
		split_seqnum++;
		return list;
	}
	else
	{
		list.push_back(makeOriginalPacket(data));
	}
	return list;
}

SharedBuffer<u8> makeReliablePacket(
		SharedBuffer<u8> data,
		u16 seqnum)
{
	/*dstream<<"BEGIN SharedBuffer<u8> makeReliablePacket()"<<std::endl;
	dstream<<"data.getSize()="<<data.getSize()<<", data[0]="
			<<((unsigned int)data[0]&0xff)<<std::endl;*/
	u32 header_size = 3;
	u32 packet_size = data.getSize() + header_size;
	SharedBuffer<u8> b(packet_size);

	writeU8(&b[0], TYPE_RELIABLE);
	writeU16(&b[1], seqnum);

	memcpy(&b[header_size], *data, data.getSize());

	/*dstream<<"data.getSize()="<<data.getSize()<<", data[0]="
			<<((unsigned int)data[0]&0xff)<<std::endl;*/
	//dstream<<"END SharedBuffer<u8> makeReliablePacket()"<<std::endl;
	return b;
}

/*
	ReliablePacketBuffer
*/

void ReliablePacketBuffer::print()
{
	core::list<BufferedPacket>::Iterator i;
	i = m_list.begin();
	for(; i != m_list.end(); i++)
	{
		u16 s = readU16(&(i->data[BASE_HEADER_SIZE+1]));
		dout_con<<s<<" ";
	}
}
bool ReliablePacketBuffer::empty()
{
	return m_list.empty();
}
u32 ReliablePacketBuffer::size()
{
	return m_list.getSize();
}
RPBSearchResult ReliablePacketBuffer::findPacket(u16 seqnum)
{
	core::list<BufferedPacket>::Iterator i;
	i = m_list.begin();
	for(; i != m_list.end(); i++)
	{
		u16 s = readU16(&(i->data[BASE_HEADER_SIZE+1]));
		/*dout_con<<"findPacket(): finding seqnum="<<seqnum
				<<", comparing to s="<<s<<std::endl;*/
		if(s == seqnum)
			break;
	}
	return i;
}
RPBSearchResult ReliablePacketBuffer::notFound()
{
	return m_list.end();
}
u16 ReliablePacketBuffer::getFirstSeqnum()
{
	if(empty())
		throw NotFoundException("Buffer is empty");
	BufferedPacket p = *m_list.begin();
	return readU16(&p.data[BASE_HEADER_SIZE+1]);
}
BufferedPacket ReliablePacketBuffer::popFirst()
{
	if(empty())
		throw NotFoundException("Buffer is empty");
	BufferedPacket p = *m_list.begin();
	core::list<BufferedPacket>::Iterator i = m_list.begin();
	m_list.erase(i);
	return p;
}
BufferedPacket ReliablePacketBuffer::popSeqnum(u16 seqnum)
{
	RPBSearchResult r = findPacket(seqnum);
	if(r == notFound()){
		dout_con<<"Not found"<<std::endl;
		throw NotFoundException("seqnum not found in buffer");
	}
	BufferedPacket p = *r;
	m_list.erase(r);
	return p;
}
void ReliablePacketBuffer::insert(BufferedPacket &p)
{
	assert(p.data.getSize() >= BASE_HEADER_SIZE+3);
	u8 type = readU8(&p.data[BASE_HEADER_SIZE+0]);
	assert(type == TYPE_RELIABLE);
	u16 seqnum = readU16(&p.data[BASE_HEADER_SIZE+1]);

	// Find the right place for the packet and insert it there

	// If list is empty, just add it
	if(m_list.empty())
	{
		m_list.push_back(p);
		// Done.
		return;
	}
	// Otherwise find the right place
	core::list<BufferedPacket>::Iterator i;
	i = m_list.begin();
	// Find the first packet in the list which has a higher seqnum
	for(; i != m_list.end(); i++){
		u16 s = readU16(&(i->data[BASE_HEADER_SIZE+1]));
		if(s == seqnum){
			throw AlreadyExistsException("Same seqnum in list");
		}
		if(seqnum_higher(s, seqnum)){
			break;
		}
	}
	// If we're at the end of the list, add the packet to the
	// end of the list
	if(i == m_list.end())
	{
		m_list.push_back(p);
		// Done.
		return;
	}
	// Insert before i
	m_list.insert_before(i, p);
}

void ReliablePacketBuffer::incrementTimeouts(float dtime)
{
	core::list<BufferedPacket>::Iterator i;
	i = m_list.begin();
	for(; i != m_list.end(); i++){
		i->time += dtime;
		i->totaltime += dtime;
	}
}

void ReliablePacketBuffer::resetTimedOuts(float timeout)
{
	core::list<BufferedPacket>::Iterator i;
	i = m_list.begin();
	for(; i != m_list.end(); i++){
		if(i->time >= timeout)
			i->time = 0.0;
	}
}

bool ReliablePacketBuffer::anyTotaltimeReached(float timeout)
{
	core::list<BufferedPacket>::Iterator i;
	i = m_list.begin();
	for(; i != m_list.end(); i++){
		if(i->totaltime >= timeout)
			return true;
	}
	return false;
}

core::list<BufferedPacket> ReliablePacketBuffer::getTimedOuts(float timeout)
{
	core::list<BufferedPacket> timed_outs;
	core::list<BufferedPacket>::Iterator i;
	i = m_list.begin();
	for(; i != m_list.end(); i++)
	{
		if(i->time >= timeout)
			timed_outs.push_back(*i);
	}
	return timed_outs;
}

/*
	IncomingSplitBuffer
*/

IncomingSplitBuffer::~IncomingSplitBuffer()
{
	core::map<u16, IncomingSplitPacket*>::Iterator i;
	i = m_buf.getIterator();
	for(; i.atEnd() == false; i++)
	{
		delete i.getNode()->getValue();
	}
}
/*
	This will throw a GotSplitPacketException when a full
	split packet is constructed.
*/
SharedBuffer<u8> IncomingSplitBuffer::insert(BufferedPacket &p, bool reliable)
{
	u32 headersize = BASE_HEADER_SIZE + 7;
	assert(p.data.getSize() >= headersize);
	u8 type = readU8(&p.data[BASE_HEADER_SIZE+0]);
	assert(type == TYPE_SPLIT);
	u16 seqnum = readU16(&p.data[BASE_HEADER_SIZE+1]);
	u16 chunk_count = readU16(&p.data[BASE_HEADER_SIZE+3]);
	u16 chunk_num = readU16(&p.data[BASE_HEADER_SIZE+5]);

	// Add if doesn't exist
	if(m_buf.find(seqnum) == NULL)
	{
		IncomingSplitPacket *sp = new IncomingSplitPacket();
		sp->chunk_count = chunk_count;
		sp->reliable = reliable;
		m_buf[seqnum] = sp;
	}
	
	IncomingSplitPacket *sp = m_buf[seqnum];
	
	// TODO: These errors should be thrown or something? Dunno.
	if(chunk_count != sp->chunk_count)
		derr_con<<"Connection: WARNING: chunk_count="<<chunk_count
				<<" != sp->chunk_count="<<sp->chunk_count
				<<std::endl;
	if(reliable != sp->reliable)
		derr_con<<"Connection: WARNING: reliable="<<reliable
				<<" != sp->reliable="<<sp->reliable