minetest/src/connection.cpp at master · basicinside/minetest · GitHub

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Minetest-c55

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 "connection.h"

#include "main.h"

#include "serialization.h"

#include "log.h"

#include "porting.h"

namespace con

{

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

<<std::endl;

// If chunk already exists, cancel

if(sp->chunks.find(chunk_num) != NULL)

throw AlreadyExistsException("Chunk already in buffer");

// Cut chunk data out of packet

u32 chunkdatasize = p.data.getSize() - headersize;

SharedBuffer<u8> chunkdata(chunkdatasize);

memcpy(*chunkdata, &(p.data[headersize]), chunkdatasize);

// Set chunk data in buffer

sp->chunks[chunk_num] = chunkdata;

// If not all chunks are received, return empty buffer

if(sp->allReceived() == false)

return SharedBuffer<u8>();

// Calculate total size

u32 totalsize = 0;

core::map<u16, SharedBuffer<u8> >::Iterator i;

i = sp->chunks.getIterator();

for(; i.atEnd() == false; i++)

{

totalsize += i.getNode()->getValue().getSize();

}

SharedBuffer<u8> fulldata(totalsize);

// Copy chunks to data buffer

u32 start = 0;

for(u32 chunk_i=0; chunk_i<sp->chunk_count;

chunk_i++)

{

SharedBuffer<u8> buf = sp->chunks[chunk_i];

u16 chunkdatasize = buf.getSize();

memcpy(&fulldata[start], *buf, chunkdatasize);

start += chunkdatasize;;

}

// Remove sp from buffer

m_buf.remove(seqnum);

delete sp;

return fulldata;

}

void IncomingSplitBuffer::removeUnreliableTimedOuts(float dtime, float timeout)

{

core::list<u16> remove_queue;

core::map<u16, IncomingSplitPacket*>::Iterator i;

i = m_buf.getIterator();

for(; i.atEnd() == false; i++)

{

IncomingSplitPacket *p = i.getNode()->getValue();

// Reliable ones are not removed by timeout

if(p->reliable == true)

continue;

p->time += dtime;

if(p->time >= timeout)

remove_queue.push_back(i.getNode()->getKey());

}

core::list<u16>::Iterator j;

j = remove_queue.begin();

for(; j != remove_queue.end(); j++)

{

dout_con<<"NOTE: Removing timed out unreliable split packet"

<<std::endl;

delete m_buf[*j];

m_buf.remove(*j);

}

Channel

Channel::Channel()

{

next_outgoing_seqnum = SEQNUM_INITIAL;

next_incoming_seqnum = SEQNUM_INITIAL;

next_outgoing_split_seqnum = SEQNUM_INITIAL;

}

Channel::~Channel()

{

}

Peer

Peer::Peer(u16 a_id, Address a_address):

address(a_address),

id(a_id),

timeout_counter(0.0),

ping_timer(0.0),

resend_timeout(0.5),

avg_rtt(-1.0),

has_sent_with_id(false),

m_sendtime_accu(0),

m_max_packets_per_second(10),

m_num_sent(0),

m_max_num_sent(0)

{

}

Peer::~Peer()

{

}

void Peer::reportRTT(float rtt)

{

if(rtt >= 0.0){

if(rtt < 0.01){

if(m_max_packets_per_second < 100)

m_max_packets_per_second += 10;

} else if(rtt < 0.2){

if(m_max_packets_per_second < 100)

m_max_packets_per_second += 2;

} else {

m_max_packets_per_second *= 0.8;

if(m_max_packets_per_second < 10)

m_max_packets_per_second = 10;

}

if(rtt < -0.999)

{}

else if(avg_rtt < 0.0)

avg_rtt = rtt;

else

avg_rtt = rtt * 0.1 + avg_rtt * 0.9;

// Calculate resend_timeout

/*int reliable_count = 0;

for(int i=0; i<CHANNEL_COUNT; i++)

{

reliable_count += channels[i].outgoing_reliables.size();

}

float timeout = avg_rtt * RESEND_TIMEOUT_FACTOR

* ((float)reliable_count * 1);*/

float timeout = avg_rtt * RESEND_TIMEOUT_FACTOR;

if(timeout < RESEND_TIMEOUT_MIN)

timeout = RESEND_TIMEOUT_MIN;

if(timeout > RESEND_TIMEOUT_MAX)

timeout = RESEND_TIMEOUT_MAX;

resend_timeout = timeout;

}

Connection

Connection::Connection(u32 protocol_id, u32 max_packet_size, float timeout):

m_protocol_id(protocol_id),

m_max_packet_size(max_packet_size),

m_timeout(timeout),

m_peer_id(0),

m_bc_peerhandler(NULL),

m_bc_receive_timeout(0),

m_indentation(0)

{

m_socket.setTimeoutMs(5);

Start();

}

Connection::Connection(u32 protocol_id, u32 max_packet_size, float timeout,

PeerHandler *peerhandler):

m_protocol_id(protocol_id),

m_max_packet_size(max_packet_size),

m_timeout(timeout),

m_peer_id(0),

m_bc_peerhandler(peerhandler),

m_bc_receive_timeout(0),

m_indentation(0)

{

m_socket.setTimeoutMs(5);

Start();

}

Connection::~Connection()

{

stop();

}

/* Internal stuff */

void * Connection::Thread()

{

ThreadStarted();

log_register_thread("Connection");

dout_con<<"Connection thread started"<<std::endl;

u32 curtime = porting::getTimeMs();

u32 lasttime = curtime;

while(getRun())

{

BEGIN_DEBUG_EXCEPTION_HANDLER

lasttime = curtime;

curtime = porting::getTimeMs();

float dtime = (float)(curtime - lasttime) / 1000.;

if(dtime > 0.1)

dtime = 0.1;

if(dtime < 0.0)

dtime = 0.0;

runTimeouts(dtime);

while(m_command_queue.size() != 0){

ConnectionCommand c = m_command_queue.pop_front();

processCommand(c);

}

send(dtime);

receive();

END_DEBUG_EXCEPTION_HANDLER(derr_con);

}

return NULL;

}

void Connection::putEvent(ConnectionEvent &e)

{

assert(e.type != CONNEVENT_NONE);

m_event_queue.push_back(e);

}

void Connection::processCommand(ConnectionCommand &c)

{

switch(c.type){

case CONNCMD_NONE:

dout_con<<getDesc()<<" processing CONNCMD_NONE"<<std::endl;

return;

case CONNCMD_SERVE:

dout_con<<getDesc()<<" processing CONNCMD_SERVE port="

<<c.port<<std::endl;

serve(c.port);

return;

case CONNCMD_CONNECT:

dout_con<<getDesc()<<" processing CONNCMD_CONNECT"<<std::endl;

connect(c.address);

return;

case CONNCMD_DISCONNECT:

dout_con<<getDesc()<<" processing CONNCMD_DISCONNECT"<<std::endl;

disconnect();

return;

case CONNCMD_SEND:

dout_con<<getDesc()<<" processing CONNCMD_SEND"<<std::endl;

send(c.peer_id, c.channelnum, c.data, c.reliable);

return;

case CONNCMD_SEND_TO_ALL:

dout_con<<getDesc()<<" processing CONNCMD_SEND_TO_ALL"<<std::endl;

sendToAll(c.channelnum, c.data, c.reliable);

return;

case CONNCMD_DELETE_PEER:

dout_con<<getDesc()<<" processing CONNCMD_DELETE_PEER"<<std::endl;

deletePeer(c.peer_id, false);

return;

}

void Connection::send(float dtime)

{

for(core::map<u16, Peer*>::Iterator

j = m_peers.getIterator();

j.atEnd() == false; j++)

{

Peer *peer = j.getNode()->getValue();

peer->m_sendtime_accu += dtime;

peer->m_num_sent = 0;

peer->m_max_num_sent = peer->m_sendtime_accu *

peer->m_max_packets_per_second;

}

Queue<OutgoingPacket> postponed_packets;

while(m_outgoing_queue.size() != 0){

OutgoingPacket packet = m_outgoing_queue.pop_front();

Peer *peer = getPeerNoEx(packet.peer_id);

if(!peer)

continue;

if(peer->channels[packet.channelnum].outgoing_reliables.size() >= 5){

postponed_packets.push_back(packet);

} else if(peer->m_num_sent < peer->m_max_num_sent){

rawSendAsPacket(packet.peer_id, packet.channelnum,

packet.data, packet.reliable);

peer->m_num_sent++;

} else {

postponed_packets.push_back(packet);

}

while(postponed_packets.size() != 0){

m_outgoing_queue.push_back(postponed_packets.pop_front());

}

for(core::map<u16, Peer*>::Iterator

j = m_peers.getIterator();

j.atEnd() == false; j++)

{

Peer *peer = j.getNode()->getValue();

peer->m_sendtime_accu -= (float)peer->m_num_sent /

peer->m_max_packets_per_second;

if(peer->m_sendtime_accu > 10. / peer->m_max_packets_per_second)

peer->m_sendtime_accu = 10. / peer->m_max_packets_per_second;

}

// Receive packets from the network and buffers and create ConnectionEvents

void Connection::receive()

{

u32 datasize = 100000;

// TODO: We can not know how many layers of header there are.

// For now, just assume there are no other than the base headers.

u32 packet_maxsize = datasize + BASE_HEADER_SIZE;

SharedBuffer<u8> packetdata(packet_maxsize);

bool single_wait_done = false;

for(;;)

{

try{

/* Check if some buffer has relevant data */

{

u16 peer_id;

SharedBuffer<u8> resultdata;

bool got = getFromBuffers(peer_id, resultdata);

if(got){

ConnectionEvent e;

e.dataReceived(peer_id, resultdata);

putEvent(e);

continue;

}

if(single_wait_done){

if(m_socket.WaitData(0) == false)

break;

}

single_wait_done = true;

Address sender;

s32 received_size = m_socket.Receive(sender, *packetdata, packet_maxsize);

if(received_size < 0)

break;

if(received_size < BASE_HEADER_SIZE)

continue;

if(readU32(&packetdata[0]) != m_protocol_id)

continue;

u16 peer_id = readPeerId(*packetdata);

u8 channelnum = readChannel(*packetdata);

if(channelnum > CHANNEL_COUNT-1){

PrintInfo(derr_con);

derr_con<<"Receive(): Invalid channel "<<channelnum<<std::endl;

throw InvalidIncomingDataException("Channel doesn't exist");

}

if(peer_id == PEER_ID_INEXISTENT)

{

Somebody is trying to send stuff to us with no peer id.

Check if the same address and port was added to our peer

list before.

Allow only entries that have has_sent_with_id==false.

core::map<u16, Peer*>::Iterator j;

j = m_peers.getIterator();

for(; j.atEnd() == false; j++)

{

Peer *peer = j.getNode()->getValue();

if(peer->has_sent_with_id)

continue;

if(peer->address == sender)

break;

}

If no peer was found with the same address and port,

we shall assume it is a new peer and create an entry.

if(j.atEnd())

{

// Pass on to adding the peer

}

// Else: A peer was found.

else

{

Peer *peer = j.getNode()->getValue();

peer_id = peer->id;

PrintInfo(derr_con);

derr_con<<"WARNING: Assuming unknown peer to be "

<<"peer_id="<<peer_id<<std::endl;

}

The peer was not found in our lists. Add it.

if(peer_id == PEER_ID_INEXISTENT)

{

// Somebody wants to make a new connection

// Get a unique peer id (2 or higher)

u16 peer_id_new = 2;

Find an unused peer id

bool out_of_ids = false;

for(;;)

{

// Check if exists

if(m_peers.find(peer_id_new) == NULL)

break;

// Check for overflow

if(peer_id_new == 65535){

out_of_ids = true;

break;

}

peer_id_new++;

}

if(out_of_ids){

errorstream<<getDesc()<<" ran out of peer ids"<<std::endl;

continue;

}

PrintInfo();

dout_con<<"Receive(): Got a packet with peer_id=PEER_ID_INEXISTENT,"

" giving peer_id="<<peer_id_new<<std::endl;

// Create a peer

Peer *peer = new Peer(peer_id_new, sender);

m_peers.insert(peer->id, peer);

// Create peer addition event

ConnectionEvent e;

e.peerAdded(peer_id_new, sender);

putEvent(e);

// Create CONTROL packet to tell the peer id to the new peer.

SharedBuffer<u8> reply(4);

writeU8(&reply[0], TYPE_CONTROL);

writeU8(&reply[1], CONTROLTYPE_SET_PEER_ID);

writeU16(&reply[2], peer_id_new);

sendAsPacket(peer_id_new, 0, reply, true);

// We're now talking to a valid peer_id

peer_id = peer_id_new;

// Go on and process whatever it sent

}

core::map<u16, Peer*>::Node *node = m_peers.find(peer_id);

if(node == NULL)

{

// Peer not found

// This means that the peer id of the sender is not PEER_ID_INEXISTENT

// and it is invalid.

PrintInfo(derr_con);

derr_con<<"Receive(): Peer not found"<<std::endl;

throw InvalidIncomingDataException("Peer not found (possible timeout)");

}

Peer *peer = node->getValue();

// Validate peer address

if(peer->address != sender)

{

PrintInfo(derr_con);

derr_con<<"Peer "<<peer_id<<" sending from different address."

" Ignoring."<<std::endl;

continue;

}

peer->timeout_counter = 0.0;

Channel *channel = &(peer->channels[channelnum]);

// Throw the received packet to channel->processPacket()

// Make a new SharedBuffer from the data without the base headers

SharedBuffer<u8> strippeddata(received_size - BASE_HEADER_SIZE);

memcpy(*strippeddata, &packetdata[BASE_HEADER_SIZE],

strippeddata.getSize());

try{

// Process it (the result is some data with no headers made by us)

SharedBuffer<u8> resultdata = processPacket

(channel, strippeddata, peer_id, channelnum, false);

PrintInfo();

dout_con<<"ProcessPacket returned data of size "

<<resultdata.getSize()<<std::endl;

if(datasize < resultdata.getSize())

throw InvalidIncomingDataException

("Buffer too small for received data");

ConnectionEvent e;

e.dataReceived(peer_id, resultdata);

putEvent(e);

continue;

}catch(ProcessedSilentlyException &e){

}

}catch(InvalidIncomingDataException &e){

}

catch(ProcessedSilentlyException &e){

}

} // for

}

void Connection::runTimeouts(float dtime)

{

core::list<u16> timeouted_peers;

core::map<u16, Peer*>::Iterator j;

j = m_peers.getIterator();

for(; j.atEnd() == false; j++)

{

Peer *peer = j.getNode()->getValue();

Check peer timeout

peer->timeout_counter += dtime;

if(peer->timeout_counter > m_timeout)

{

PrintInfo(derr_con);

derr_con<<"RunTimeouts(): Peer "<<peer->id

<<" has timed out."

<<" (source=peer->timeout_counter)"

<<std::endl;

// Add peer to the list

timeouted_peers.push_back(peer->id);

// Don't bother going through the buffers of this one

continue;

}

float resend_timeout = peer->resend_timeout;

for(u16 i=0; i<CHANNEL_COUNT; i++)

{

core::list<BufferedPacket> timed_outs;

core::list<BufferedPacket>::Iterator j;

Channel *channel = &peer->channels[i];

// Remove timed out incomplete unreliable split packets

channel->incoming_splits.removeUnreliableTimedOuts(dtime, m_timeout);

// Increment reliable packet times

channel->outgoing_reliables.incrementTimeouts(dtime);

// Check reliable packet total times, remove peer if

// over timeout.

if(channel->outgoing_reliables.anyTotaltimeReached(m_timeout))

{

PrintInfo(derr_con);

derr_con<<"RunTimeouts(): Peer "<<peer->id

<<" has timed out."

<<" (source=reliable packet totaltime)"

<<std::endl;

// Add peer to the to-be-removed list

timeouted_peers.push_back(peer->id);

goto nextpeer;

}

// Re-send timed out outgoing reliables

timed_outs = channel->

outgoing_reliables.getTimedOuts(resend_timeout);

channel->outgoing_reliables.resetTimedOuts(resend_timeout);

j = timed_outs.begin();

for(; j != timed_outs.end(); j++)

{

u16 peer_id = readPeerId(*(j->data));

u8 channel = readChannel(*(j->data));

u16 seqnum = readU16(&(j->data[BASE_HEADER_SIZE+1]));

PrintInfo(derr_con);

derr_con<<"RE-SENDING timed-out RELIABLE to ";

j->address.print(&derr_con);

derr_con<<"(t/o="<<resend_timeout<<"): "

<<"from_peer_id="<<peer_id

<<", channel="<<((int)channel&0xff)

<<", seqnum="<<seqnum

<<std::endl;

rawSend(*j);

// Enlarge avg_rtt and resend_timeout:

// The rtt will be at least the timeout.

// NOTE: This won't affect the timeout of the next

// checked channel because it was cached.

peer->reportRTT(resend_timeout);

}

Send pings

peer->ping_timer += dtime;

if(peer->ping_timer >= 5.0)

{

// Create and send PING packet

SharedBuffer<u8> data(2);

writeU8(&data[0], TYPE_CONTROL);

writeU8(&data[1], CONTROLTYPE_PING);

rawSendAsPacket(peer->id, 0, data, true);

peer->ping_timer = 0.0;

}

nextpeer:

continue;

}

// Remove timed out peers

core::list<u16>::Iterator i = timeouted_peers.begin();

for(; i != timeouted_peers.end(); i++)

{

PrintInfo(derr_con);

derr_con<<"RunTimeouts(): Removing peer "<<(*i)<<std::endl;

deletePeer(*i, true);

}

void Connection::serve(u16 port)

{

dout_con<<getDesc()<<" serving at port "<<port<<std::endl;

m_socket.Bind(port);

m_peer_id = PEER_ID_SERVER;

}

void Connection::connect(Address address)

{

dout_con<<getDesc()<<" connecting to "<<address.serializeString()

<<":"<<address.getPort()<<std::endl;

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minetest/src/connection.cpp at master · basicinside/minetest · GitHub

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