/*
    PIP - Platform Independent Primitives
    Peer - named I/O ethernet node
    Ivan Pelipenko peri4ko@yandex.ru

    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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "pipeer.h"

#include "piconfig.h"
#include "pidatatransfer.h"
#include "piliterals_time.h"
#include "pipropertystorage.h"
#include "pitime.h"

#define _PIPEER_MSG_SIZE        4000
#define _PIPEER_MSG_TTL         100
#define _PIPEER_MULTICAST_TTL   4
#define _PIPEER_MULTICAST_IP    "232.13.3.12"
#define _PIPEER_LOOPBACK_PORT_S 13313
#define _PIPEER_LOOPBACK_PORT_E (13313 + 32)
#define _PIPEER_MULTICAST_PORT  13360
#define _PIPEER_TCP_PORT        _PIPEER_MULTICAST_PORT
#define _PIPEER_BROADCAST_PORT  13361
#define _PIPEER_TRAFFIC_PORT_S  13400
#define _PIPEER_TRAFFIC_PORT_E  14000
#define _PIPEER_PING_TIMEOUT    5.0

class PIPeer::PeerData: public PIObject {
	PIOBJECT_SUBCLASS(PeerData, PIObject);

public:
	PeerData(const PIString & n);
	~PeerData();
	EVENT_HANDLER1(void, dtSendRequestIn, PIByteArray &, data) {
		data.push_front(uchar(2));
		sendRequest(name(), data);
	}
	EVENT_HANDLER1(void, dtSendRequestOut, PIByteArray &, data) {
		data.push_front(uchar(3));
		sendRequest(name(), data);
	}
	EVENT_HANDLER1(void, dtReceiveFinishedIn, bool, ok) {
		if (ok) received(name(), dt_in.data());
	}
	EVENT_HANDLER1(void, dtReceiveFinishedOut, bool, ok) {
		if (ok) received(name(), dt_out.data());
	}
	EVENT_HANDLER(void, dtThread);
	EVENT2(received, const PIString &, from, const PIByteArray &, data);
	EVENT2(sendRequest, const PIString &, to, const PIByteArray &, data);
	bool send(const PIByteArray & d);
	void receivedPacket(uchar type, const PIByteArray & d);
	void setDist(int dist);
	PIByteArray data;
	PIThread t;
	PIDataTransfer dt_in, dt_out;
};


PIPeer::PeerData::PeerData(const PIString & n): PIObject(n) {
	dt_in.setPacketSize(_PIPEER_MSG_SIZE);
	dt_out.setPacketSize(_PIPEER_MSG_SIZE);
	dt_in.setCRCEnabled(false);
	dt_out.setCRCEnabled(false);
	CONNECT1(void, PIByteArray &, &dt_in, sendRequest, this, dtSendRequestIn);
	CONNECT1(void, PIByteArray &, &dt_out, sendRequest, this, dtSendRequestOut);
	CONNECT1(void, bool, &dt_in, receiveFinished, this, dtReceiveFinishedIn);
	CONNECT1(void, bool, &dt_out, receiveFinished, this, dtReceiveFinishedOut);
	CONNECT0(void, &t, started, this, dtThread);
}


PIPeer::PeerData::~PeerData() {
	dt_in.stop();
	dt_out.stop();
	t.stop();
	if (!t.waitForFinish(1_s)) t.terminate();
}


void PIPeer::PeerData::dtThread() {
	dt_out.send(data);
	// piCoutObj << "send DT done";
}


bool PIPeer::PeerData::send(const PIByteArray & d) {
	// piCout << "send ..." << t.isRunning();
	if (t.isRunning()) return false;
	data = d;
	t.startOnce();
	return true;
}


void PIPeer::PeerData::receivedPacket(uchar type, const PIByteArray & d) {
	PIDataTransfer * dt = 0;
	if (type == 3) dt = &dt_in;
	if (type == 2) dt = &dt_out;
	// piCoutObj << "DT received" << int(type) << d.size_s() << "...";
	if (dt) dt->received(d);
	// piCoutObj << "DT received" << int(type) << d.size_s() << "done";
}


void PIPeer::PeerData::setDist(int dist) {
	dt_in.setTimeout(10 * dist);
}


PIPeer::PeerInfo::PeerAddress::PeerAddress(const PINetworkAddress & a, const PINetworkAddress & m): address(a), netmask(m) {
	ping      = -1.;
	wait_ping = false;
	last_ping = PISystemTime::current(true);
}


int PIPeer::PeerInfo::ping() const {
	int ret = -1;
	for (const auto & a: addresses)
		if (a.ping > 0.) {
			if (ret < 0)
				ret = piRoundd(a.ping);
			else
				ret = piMini(ret, piRoundd(a.ping));
		}
	return ret;
}


void PIPeer::PeerInfo::init() {
	if (_data == 0) _data = new PeerData(name);
}


void PIPeer::PeerInfo::destroy() {
	if (_data) delete _data;
	_data = 0;
}


PINetworkAddress PIPeer::PeerInfo::fastestAddress() const {
	double mp = -1.;
	PINetworkAddress ret;
	for (const auto & a: addresses) {
		if (a.ping <= 0.) continue;
		if ((mp < 0) || (mp > a.ping)) {
			mp  = a.ping;
			ret = a.address;
		}
	}
	return ret;
}


void PIPeer::PeerInfo::addNeighbour(const PIString & n) {
	if (!neighbours.contains(n)) neighbours << n;
}


void PIPeer::PeerInfo::addNeighbours(const PIStringList & l) {
	for (const auto & n: l)
		if (!neighbours.contains(n)) neighbours << n;
}

void PIPeer::PeerInfo::removeNeighbour(const PIString & n) {
	neighbours.removeAll(n);
}


void PIPeer::PeerInfo::resetPing() {
	for (auto & a: addresses)
		a.ping = -1;
}


REGISTER_DEVICE(PIPeer)

PIPeer::PIPeer(const PIString & n)
	: PIIODevice()
	, inited__(false)
	, eth_tcp_srv(PIEthernet::TCP_Server)
	, eth_tcp_cli(PIEthernet::TCP_Client)
	, diag_s(false)
	, diag_d(false) {
	sync_timer.setName("_S.PIPeer.sync");
	// piCout << " PIPeer" << uint(this);
	destroyed = false;
	setDebug(false);
	PIMutexLocker mbl(mc_mutex);
	PIMutexLocker ethl(eth_mutex);
	PIMutexLocker pl(peers_mutex);
	PIMutexLocker sl(send_mutex);
	changeName(n);
	setReopenTimeout(100_ms);
	read_buffer_size = 128;
	self_info.dist   = 0;
	self_info.time   = PISystemTime::current();
	randomize();
	CONNECT1(void, int, &sync_timer, tickEvent, this, timerEvent);
	prev_ifaces = PIEthernet::interfaces();
	no_timer    = false;
	sync_timer.addDelimiter(5);
}


PIPeer::~PIPeer() {
	// piCout << "~PIPeer" << uint(this);
	stop();
	if (destroyed) return;
	destroyed = true;
	destroy();
}


void PIPeer::timerEvent(int delim) {
	//	piCoutObj << "timerEvent" << delim;
	if (no_timer) return;
	switch (delim) {
	case 1: // every 1 s
		syncPeers();
		piMSleep(100);
		pingNeighbours();
		// piCoutObj << "isOpened" << isOpened();
		break;
	case 5: // every 5 s
		checkNetwork();
		break;
	}
}


void PIPeer::initEths(PIStringList al) {
	//	piCoutObj << "initEths start";
	PIEthernet * ce;
	const PIEthernet::Interface * cint = 0;
	for (const auto & a: al) {
		ce = new PIEthernet();
		ce->setDebug(false);
		ce->setName("_S.PIPeer.traf_rec_" + a);
		ce->setParameters(0);
		bool ok = false;
		for (int p = _PIPEER_TRAFFIC_PORT_S; p < _PIPEER_TRAFFIC_PORT_E; ++p) {
			ce->setReadAddress(a, p);
			if (ce->open()) {
				eths_traffic << ce;
				cint = prev_ifaces.getByAddress(a);
				self_info.addresses << PeerInfo::PeerAddress(ce->path(), cint == 0 ? "255.255.255.0" : cint->netmask);
				CONNECT2(void, const uchar *, ssize_t, ce, threadedReadEvent, this, dataRead);
				ce->startThreadedRead();
				//				piCoutObj << "dc binded to" << ce->path();
				//				piCoutObj << "add eth" << a;
				ok = true;
				break;
			}
		}
		if (!ok) delete ce;
	}
	eth_send.setDebug(false);
	eth_send.setName("_S.PIPeer.traf_send");
	eth_send.setParameters(0);
	//	piCoutObj << "initEths ok";
}


void PIPeer::initMBcasts(PIStringList al) {
	PIEthernet * ce;
	const PIEthernet::Interface * cint;
	PIString nm;
	al << _PIPEER_MULTICAST_IP;
	//	piCoutObj << "initMBcasts start" << al;
	for (const auto & a: al) {
		// piCout << "mcast try" << a;
		ce = new PIEthernet();
		ce->setDebug(false);
		ce->setName("_S.PIPeer.mcast_" + a);
		ce->setParameters(0);
		ce->setSendAddress(_PIPEER_MULTICAST_IP, _PIPEER_MULTICAST_PORT);
		ce->setReadAddress(a, _PIPEER_MULTICAST_PORT);
		ce->setMulticastTTL(_PIPEER_MULTICAST_TTL);
		ce->joinMulticastGroup(_PIPEER_MULTICAST_IP);
		if (ce->open()) {
			eths_mcast << ce;
			CONNECT2(void, const uchar *, ssize_t, ce, threadedReadEvent, this, mbcastRead);
			ce->startThreadedRead();
			//			piCout << "mcast bind to" << a << ce->sendIP();
		} else {
			delete ce;
			// piCoutObj << "invalid address for mcast" << a;
		}
	}
	al.removeAll(_PIPEER_MULTICAST_IP);
	for (const auto & a: al) {
		ce = new PIEthernet();
		ce->setDebug(false);
		ce->setName("_S.PIPeer.bcast_" + a);
		ce->setParameters(PIEthernet::Broadcast);
		cint = prev_ifaces.getByAddress(a);
		nm   = (cint == 0) ? "255.255.255.0" : cint->netmask;
		ce->setSendAddress(PIEthernet::getBroadcast(a, nm), _PIPEER_BROADCAST_PORT);
		ce->setReadAddress(a, _PIPEER_BROADCAST_PORT);
		if (ce->open()) {
			eths_bcast << ce;
			CONNECT2(void, const uchar *, ssize_t, ce, threadedReadEvent, this, mbcastRead);
			ce->startThreadedRead();
			//			piCout << "mc BC try" << a << nm << ce->sendIP();
			//			piCout << "bcast bind to" << a << nm;
		} else {
			delete ce;
			// piCoutObj << "invalid address for bcast" << a;
		}
	}
	eth_lo.setName("_S.PIPeer.lo");
	eth_lo.setParameters(PIEthernet::SeparateSockets);
	eth_lo.init();
	cint = prev_ifaces.getByAddress("127.0.0.1");
	for (int p = _PIPEER_LOOPBACK_PORT_S; p <= _PIPEER_LOOPBACK_PORT_E; ++p) {
		eth_lo.setReadAddress("127.0.0.1", p);
		if (eth_lo.open()) {
			eth_lo.setSendIP("127.0.0.1");
			CONNECT2(void, const uchar *, ssize_t, &eth_lo, threadedReadEvent, this, mbcastRead);
			eth_lo.startThreadedRead();
			//			piCout << "lo binded to" << eth_lo.readAddress() << eth_lo.sendAddress();
			// piCout << "add eth" << ta;
			break;
		}
	}
	eth_tcp_srv.setName("_S.PIPeer.TCP_Server");
	eth_tcp_srv.init();
	eth_tcp_srv.listen("0.0.0.0", _PIPEER_TCP_PORT, true);
	eth_tcp_srv.setDebug(false);
	CONNECT1(void, PIEthernet *, &eth_tcp_srv, newConnection, this, newTcpClient);
	eth_tcp_srv.startThreadedRead();
	eth_tcp_cli.setName("_S.PIPeer.TCP_Client");
	eth_tcp_cli.init();
	eth_tcp_cli.setDebug(false);
	tcpClientReconnect();
	CONNECT2(void, const uchar *, ssize_t, &eth_tcp_cli, threadedReadEvent, this, mbcastRead);
	CONNECTU(&eth_tcp_cli, disconnected, this, tcpClientReconnect);
	eth_tcp_cli.startThreadedRead();
	if (eths_mcast.isEmpty() && eths_bcast.isEmpty() && !eth_lo.isOpened())
		piCoutObj << "Warning! Can`t find suitable network interface for multicast receive, check for exists at least one interface with "
					 "multicasting enabled!";
	//	piCoutObj << "initMBcasts ok";
}


void PIPeer::destroy() {
	sync_timer.stopAndWait();
	diag_s.stopAndWait();
	diag_d.stopAndWait();
	PIMutexLocker ml(peers_mutex);
	for (auto & p: peers)
		if (p._data) {
			p._data->dt_in.stop();
			p._data->dt_out.stop();
			p._data->t.stopAndWait();
		}
	destroyEths();
	for (auto * i: eths_mcast) {
		if (!i) continue;
		i->stopAndWait();
	}
	for (auto * i: eths_bcast) {
		if (!i) continue;
		i->stopAndWait();
	}
	eth_lo.stopAndWait();
	eth_tcp_srv.stopAndWait();
	eth_tcp_cli.stopAndWait();
	sendSelfRemove();
	eth_lo.close();
	eth_tcp_srv.close();
	eth_tcp_cli.close();
	destroyMBcasts();
	eth_send.close();
	for (auto & p: peers)
		p.destroy();
	peers.clear();
	destroyed = true;
}


void PIPeer::destroyEths() {
	for (auto * i: eths_traffic) {
		if (!i) continue;
		i->stopAndWait();
		i->close();
	}
	piDeleteAllAndClear(eths_traffic);
}


void PIPeer::destroyMBcasts() {
	for (auto * i: eths_mcast) {
		if (!i) continue;
		i->leaveMulticastGroup(_PIPEER_MULTICAST_IP);
		i->stopAndWait();
		i->close();
	}
	for (auto * i: eths_bcast) {
		if (!i) continue;
		i->stopAndWait();
		i->close();
	}
	piDeleteAllAndClear(eths_mcast);
	piDeleteAllAndClear(eths_bcast);
	eth_lo.stopAndWait();
	eth_lo.close();
	eth_tcp_srv.stopAndWait();
}


PIPeer::PeerInfo * PIPeer::quickestPeer(const PIString & to) {
	if (!peers_map.contains(to)) return 0;
	// piCout << "*** search quickest peer" << to;
	PIVector<PeerInfo *> tp = addresses_map.value(to);
	if (tp.isEmpty()) return 0;
	return tp.back();
}


bool PIPeer::send(const PIString & to, const void * data, int size) {
	PIByteArray ba(data, size);
	//	piCoutObj << "send" << ba.size_s() << "bytes" << _PIPEER_MSG_SIZE;
	if (ba.size_s() <= _PIPEER_MSG_SIZE) {
		ba.insert(0, uchar(1));
		return sendInternal(to, ba);
	} else {
		// ba.insert(0, uchar(2));
		PIMutexLocker mlocker(peers_mutex);
		PeerInfo * dp = const_cast<PeerInfo *>(getPeerByName(to));
		if (!dp) return false;
		return dp->_data->send(ba);
	}
	return true;
}


bool PIPeer::send(const PeerInfo * to, const PIByteArray & data) {
	if (!to) return false;
	return send(to->name, data.data(), data.size_s());
}


bool PIPeer::send(const PeerInfo * to, const PIString & data) {
	if (!to) return false;
	return send(to->name, data.data(), data.size_s());
}


bool PIPeer::send(const PeerInfo * to, const void * data, int size) {
	if (!to) return false;
	return send(to->name, data, size);
}


void PIPeer::sendToAll(const PIByteArray & data) {
	for (const auto & i: peers)
		send(i.name, data.data(), data.size_s());
}


void PIPeer::sendToAll(const PIString & data) {
	for (const auto & i: peers)
		send(i.name, data.data(), data.size_s());
}


void PIPeer::sendToAll(const void * data, int size) {
	for (const auto & i: peers)
		send(i.name, data, size);
}


bool PIPeer::sendInternal(const PIString & to, const PIByteArray & data) {
	PIMutexLocker mlocker(peers_mutex);
	PeerInfo * dp = quickestPeer(to);
	if (dp == 0) {
		// piCoutObj << "Can`t find peer \"" << to << "\"!";
		return false;
	}
	PIByteArray ba;
	ba << int(4) << self_info.name << to << int(0) << data;
	//	piCoutObj << "sendInternal to" << to << data.size_s() << int(data.front());
	if (!sendToNeighbour(dp, ba)) {
		// piCoutObj << "send error";
		return false;
	}
	return true;
}


void PIPeer::dtReceived(const PIString & from, const PIByteArray & data) {
	PIByteArray ba = data;
	dataReceived(from, data);
	dataReceivedEvent(from, data);
	if (trust_peer.isEmpty() || trust_peer == from) {
		read_buffer_mutex.lock();
		if (read_buffer.size_s() < read_buffer_size) read_buffer.enqueue(ba);
		read_buffer_mutex.unlock();
	}
}


bool PIPeer::dataRead(const uchar * readed, ssize_t size) {
	if (destroyed) {
		// piCout << "[PIPeer] SegFault";
		return true;
	}
	if (size < 16) return true;
	PIByteArray ba(readed, size), sba, pba;
	int type, cnt;
	PIString from, to;
	ba >> type;
	eth_mutex.lock();
	//	piCout << "dataRead lock";
	if (type == 5) { // ping request
		PINetworkAddress addr;
		PISystemTime time;
		ba >> to >> from >> addr >> time;
		//		piCout << "ping request" << to << from << addr;
		PIMutexLocker plocker(peers_mutex);
		if (from == self_info.name) { // send ping back
			const PeerInfo * pi = getPeerByName(to);
			if (pi) {
				if (pi->isNeighbour()) {
					sba << int(6) << to << from << addr << time;
					//					piCout << "  ping from" << from << addr << ", send back to" << pi->name;
					send_mutex.lock();
					for (const auto & a: pi->addresses) {
						if (eth_send.send(a.address, sba)) diag_s.received(sba.size_s());
					}
					send_mutex.unlock();
				}
			}
		}
		eth_mutex.unlock();
		return true;
	}
	if (type == 6) { // ping request
		PINetworkAddress addr;
		PISystemTime time, ptime, ctime = PISystemTime::current(true);
		ba >> to >> from >> addr >> time;
		//		piCout << "ping reply" << to << from << addr;
		PIMutexLocker plocker(peers_mutex);
		if (to == self_info.name) { // ping echo
			for (auto & p: peers) {
				if (!p.isNeighbour()) continue;
				if (p.name != from) continue;
				for (auto & a: p.addresses) {
					if (a.address != addr) continue;
					if (a.last_ping >= time) break;
					ptime       = ctime - time;
					a.last_ping = time;
					a.wait_ping = false;
					if (a.ping < 0)
						a.ping = ptime.toMilliseconds();
					else
						a.ping = 0.6 * a.ping + 0.4 * ptime.toMilliseconds();
					//					piCout << "  ping echo" << p.name << a.address << a.ping;
					eth_mutex.unlock();
					return true;
				}
			}
		}
		eth_mutex.unlock();
		return true;
	}
	//	piCoutObj << "received data from" << from << "packet" << type;
	if (type != 4) {
		eth_mutex.unlock();
		return true;
	}
	diag_d.received(size);
	ba >> from >> to >> cnt >> pba;
	// piCoutObj << "Received packet" << type << from << to << pba.size_s();
	if (type == 4) {                // data packet
		if (to == self_info.name) { // my packet
			uchar pt = pba.take_front();
			// piCoutObj << "Received packet" << type << from << to << int(pt) << pba.size_s();
			peers_mutex.lock();
			PeerInfo * fp = const_cast<PeerInfo *>(getPeerByName(from));
			if (fp == 0) {
				peers_mutex.unlock();
				eth_mutex.unlock();
				return true;
			}
			if (pt == 1) {
				peers_mutex.unlock();
				eth_mutex.unlock();
				dtReceived(from, pba);
				return true;
			}
			if (pt == 2 || pt == 3) {
				peers_mutex.unlock();
				eth_mutex.unlock();
				if (fp->_data) fp->_data->receivedPacket(pt, pba);
				return true;
			}
			peers_mutex.unlock();
			eth_mutex.unlock();
			return true;
		}
		PIMutexLocker plocker(peers_mutex);
		PeerInfo * dp = quickestPeer(to);
		if (dp == 0) {
			// piCoutObj << "Can`t find peer \"" << to << "\"!";
			eth_mutex.unlock();
			return true;
		}
		cnt++;
		if (cnt > _PIPEER_MSG_TTL || from == dp->name) return true;
		sba << type << from << to << cnt << pba;
		// piCout << "translate packet" << from << "->" << to << ", ttl =" << cnt;
		sendToNeighbour(dp, sba);
	}
	eth_mutex.unlock();
	return true;
}


bool PIPeer::mbcastRead(const uchar * data, ssize_t size) {
	if (destroyed) {
		// piCout << "[PIPeer] SegFault";
		return true;
	}
	if (size < 8) return true;
	int type, dist;
	PIByteArray ba(data, size);
	ba >> type;
	if (type <= 0 || type >= 4) return true;
	PeerInfo pi;
	ba >> pi.name;
	// piCout << "received mb from" << pi.name << "packet" << type;
	if (pi.name == self_info.name) return true;
	PIMutexLocker locker(mc_mutex);
	diag_s.received(size);
	const PeerInfo * rpi = 0;
	bool ch              = false;
	PIVector<PeerInfo> rpeers;
	// piCout << "analyz ...";
	switch (type) {
	case 1: // new peer
		// piCout << "new peer packet ...";
		peers_mutex.lock();
		if (!hasPeer(pi.name)) {
			ba >> pi;
			pi.sync = 0;
			if (pi.dist == 0) {
				pi.addNeighbour(self_info.name);
				self_info.addNeighbour(pi.name);
			}
			pi.resetPing();
			addPeer(pi);
			buildMap();
			//			piCoutObj << "new peer \"" << pi.name << "\"" << " dist " << pi.dist;
			//			piCoutObj << mode() << opened_;
			pi.dist++;
			sendSelfInfo();
			sendPeerInfo(pi);
			ch = true;
			// piCout << "new peer packet ok";
		}
		peers_mutex.unlock();
		if (ch) {
			peerConnected(pi.name);
			peerConnectedEvent(pi.name);
		}
		break;
	case 2: // remove peer
		// piCout << "remove peer packet ..." << pi.name;
		peers_mutex.lock();
		removeNeighbour(pi.name);
		rpi = getPeerByName(pi.name);
		if (rpi) {
			dist = rpi->dist;
			addToRemoved(*rpi);
			removePeer(pi.name);
			// piCoutObj << "remove peer \"" << pi.name << "\"";
			if (dist == 0) self_info.removeNeighbour(pi.name);
			sendPeerRemove(pi.name);
			buildMap();
			ch = true;
			// piCout << "remove peer packet ok";
		}
		peers_mutex.unlock();
		if (ch) {
			peerDisconnected(pi.name);
			peerDisconnectedEvent(pi.name);
		}
		break;
	case 3: // sync peers
		// piCout << "sync packet ...";
		ba >> pi >> rpeers;
		rpeers << pi;
		// piCoutObj << "rec sync " << rpeers.size_s() << " peers";
		peers_mutex.lock();
		if (!self_info.neighbours.contains(pi.name)) {
			// piCoutObj << "add new nei to me" << pi.name;
			self_info.addNeighbour(pi.name);
			PeerInfo * np = peers_map.value(pi.name);
			if (np) {
				np->addNeighbour(self_info.name);
				np->dist = 0;
			}
			ch = true;
		}
		for (auto & rpeer: rpeers) {
			// piCout << " to sync " << rpeer.name;
			if (rpeer.name == self_info.name) continue;
			bool exist = false;
			for (auto & peer: peers) {
				if (peer.name == rpeer.name) {
					exist = true;
					if (isPeerRecent(peer, rpeer)) {
						// piCout << "synced " << peer.name;
						for (int z = 0; z < rpeer.addresses.size_s(); ++z) {
							PeerInfo::PeerAddress & ra(rpeer.addresses[z]);
							for (int k = 0; k < peer.addresses.size_s(); ++k) {
								PeerInfo::PeerAddress & a(peer.addresses[k]);
								if (ra.address == a.address) {
									ra.ping      = a.ping;
									ra.wait_ping = a.wait_ping;
									ra.last_ping = a.last_ping;
									break;
								}
							}
						}
						peer.was_update = true;
						peer.addresses  = rpeer.addresses;
						peer.cnt        = rpeer.cnt;
						peer.time       = rpeer.time;
						peer.addNeighbours(rpeer.neighbours);
						rpeer.neighbours = peer.neighbours;
						if (peer.name == pi.name) peer.sync = 0;
						ch = true;
					}
					break;
				}
			}
			if (exist || isRemoved(rpeer)) continue;
			rpeer.dist++;
			if (rpeer.name == pi.name) rpeer.dist = 0;
			rpeer.resetPing();
			addPeer(rpeer);
			ch = true;
			peerConnected(rpeer.name);
			peerConnectedEvent(rpeer.name);
		}
		// piCout << "***";
		// piCout << self_info.name << self_info.neighbours;
		for (auto & i: peers) {
			if (i.dist == 0) {
				self_info.addNeighbour(i.name);
				i.addNeighbour(self_info.name);
			}
			// piCout << i.name << i.neighbours;
		}
		if (ch) buildMap();
		peers_mutex.unlock();
		// piCoutObj << "after sync " << peers.size_s() << " peers";
		break;
	}
	return true;
}


bool PIPeer::sendToNeighbour(PIPeer::PeerInfo * peer, const PIByteArray & ba) {
	PINetworkAddress addr = peer->fastestAddress();
	// piCout << "[PIPeer] sendToNeighbour" << peer->name << addr << ba.size_s() << "bytes ...";
	send_mutex.lock();
	bool ok = eth_send.send(addr, ba);
	// piCout << "[PIPeer] sendToNeighbour" << (ok ? "ok" : "fail");
	if (ok) diag_d.sended(ba.size_s());
	send_mutex.unlock();
	return ok;
}


void PIPeer::sendMBcast(const PIByteArray & ba) {
	send_mc_mutex.lock();
	//	piCout << "sendMBcast" << ba.size() << "bytes ...";
	for (auto * e: eths_mcast) {
		if (e->isOpened())
			if (e->send(ba)) diag_s.sended(ba.size_s());
	}
	for (auto * e: eths_bcast) {
		if (e->isOpened())
			if (e->send(ba)) diag_s.sended(ba.size_s());
	}
	for (int p = _PIPEER_LOOPBACK_PORT_S; p <= _PIPEER_LOOPBACK_PORT_E; ++p) {
		eth_lo.setSendPort(p);
		if (eth_lo.send(ba)) diag_s.sended(ba.size_s());
	}
	PIVector<PIEthernet *> cl = eth_tcp_srv.clients();
	for (auto * e: cl) {
		if (e->isOpened() && e->isConnected())
			if (e->send(ba)) diag_s.sended(ba.size_s());
	}
	if (eth_tcp_cli.isOpened() && eth_tcp_cli.isConnected()) {
		if (eth_tcp_cli.send(ba)) diag_s.sended(ba.size_s());
	}
	//	piCout << "sendMBcast ok";
	send_mc_mutex.unlock();
}


void PIPeer::removeNeighbour(const PIString & name) {
	for (auto & p: peers)
		p.neighbours.removeOne(name);
	self_info.removeNeighbour(name);
}


void PIPeer::addPeer(const PIPeer::PeerInfo & pd) {
	peers << pd;
	PeerInfo & p(peers.back());
	p.init();
	CONNECT2(void, const PIString &, const PIByteArray &, p._data, sendRequest, this, sendInternal)
	CONNECT2(void, const PIString &, const PIByteArray &, p._data, received, this, dtReceived)
}


bool PIPeer::removePeer(const PIString & name) {
	for (int i = 0; i < peers.size_s(); ++i)
		if (peers[i].name == name) {
			peers[i].destroy();
			peers.remove(i);
			return true;
		}
	return false;
}


void PIPeer::sendPeerInfo(const PeerInfo & info) {
	PIByteArray ba;
	ba << int(1) << info.name << info;
	sendMBcast(ba);
}


void PIPeer::sendPeerRemove(const PIString & peer) {
	// piCout << name() << "sendPeerRemove" << peer;
	PIByteArray ba;
	ba << int(2) << peer;
	sendMBcast(ba);
}


void PIPeer::pingNeighbours() {
	PIMutexLocker ml(peers_mutex);
	PIByteArray ba, sba;
	ba << int(5) << self_info.name;
	//	piCoutObj << "*** pingNeighbours" << peers.size() << "...";
	for (auto & p: peers) {
		if (!p.isNeighbour()) continue;
		// piCout << "  ping neighbour" << p.name << p.ping();
		send_mutex.lock();
		for (auto & a: p.addresses) {
			//			piCout << "    address" << a.address << a.wait_ping;
			if (a.wait_ping) {
				if ((PISystemTime::current(true) - a.last_ping).abs().toSeconds() <= _PIPEER_PING_TIMEOUT) continue;
				a.ping = -1.;
			}
			a.wait_ping = true;
			sba         = ba;
			sba << p.name << a.address << PISystemTime::current(true);
			//			piCout << "ping" << p.name << a.address << a.last_ping;
			if (eth_send.send(a.address, sba)) diag_s.sended(sba.size_s());
		}
		send_mutex.unlock();
	}
	// piCout << "*** pingNeighbours" << peers.size() << "done";
}


bool PIPeer::openDevice() {
	PIConfig conf(
#ifndef WINDOWS
		"/etc/pip.conf"
#else
		"pip.conf"
#endif
		,
		PIIODevice::ReadOnly);
	server_ip = conf.getValue("peer_server_ip", "").toString();
	reinit();
	diag_d.reset();
	diag_s.reset();
	// piCoutObj << "open...";
	return true;
}


bool PIPeer::closeDevice() {
	return false;
}


void PIPeer::syncPeers() {
	// piCout << "[PIPeer \"" + self_info.name + "\"] sync " << peers.size_s() << " peers";
	PIMutexLocker locker(eth_mutex);
	//	piCout << "syncPeers lock";
	PIString pn;
	bool change = false;
	PIStringList dpeers;
	peers_mutex.lock();
	for (int i = 0; i < peers.size_s(); ++i) {
		PeerInfo & cp(peers[i]);
		if (cp.sync > 3) {
			pn = cp.name;
			// piCout << "sync: remove " << pn;
			cp.destroy();
			addToRemoved(cp);
			peers.remove(i);
			sendPeerRemove(pn);
			--i;
			removeNeighbour(pn);
			dpeers << pn;
			change = true;
			continue;
		}
		if (cp.was_update)
			cp.sync = 0;
		else
			cp.sync++;
		if (cp._data) cp._data->setDist(cp.dist + 1);
		cp.was_update = false;
	}
	if (change) buildMap();
	self_info.cnt++;
	self_info.time = PISystemTime::current();
	PIByteArray ba;
	ba << int(3) << self_info.name << self_info << peers;
	peers_mutex.unlock();
	sendMBcast(ba);
	for (const auto & p: dpeers) {
		peerDisconnected(p);
		peerDisconnectedEvent(p);
	}
}


void PIPeer::checkNetwork() {
	PIEthernet::InterfaceList ifaces = PIEthernet::interfaces();
	if (prev_ifaces == ifaces) return;
	prev_ifaces = ifaces;
	reinit();
}


void PIPeer::reinit() {
	no_timer = true;
	PIMutexLocker mbl(mc_mutex);
	PIMutexLocker ethl(eth_mutex);
	//	piCout << "reinit lock";
	PIMutexLocker pl(peers_mutex);
	PIMutexLocker sl(send_mutex);
	initNetwork();
	sendSelfInfo();
	no_timer = false;
	if (!sync_timer.isRunning()) sync_timer.start(1_Hz);
}


void PIPeer::changeName(const PIString & new_name) {
	PIString name_ = new_name;
	if (name_.isEmpty()) name_ = "rnd_" + PIString::fromNumber(randomi() % 1000);
	setName(name_);
	self_info.name = name_;
	diag_d.setName(name_ + "_data");
	diag_s.setName(name_ + "_service");
}


void PIPeer::setTcpServerIP(const PIString & ip) {
	server_ip = ip;
	tcpClientReconnect();
}


ssize_t PIPeer::bytesAvailable() const {
	ssize_t ret = 0;
	read_buffer_mutex.lock();
	if (!read_buffer.isEmpty()) ret = read_buffer.back().size();
	read_buffer_mutex.unlock();
	return ret;
}


ssize_t PIPeer::readDevice(void * read_to, ssize_t max_size) {
	iterrupted = false;
	read_buffer_mutex.lock();
	bool empty = read_buffer.isEmpty();
	read_buffer_mutex.unlock();
	while (empty) {
		read_buffer_mutex.lock();
		empty = read_buffer.isEmpty();
		read_buffer_mutex.unlock();
		if (iterrupted) {
			return 0;
		}
		piMSleep(10);
	}
	read_buffer_mutex.lock();
	if (!read_buffer.isEmpty()) {
		PIByteArray ba = read_buffer.dequeue();
		read_buffer_mutex.unlock();
		ssize_t sz = piMini(ba.size_s(), max_size);
		memcpy(read_to, ba.data(), sz);
		if (iterrupted) {
			return 0;
		}
		return sz;
	}
	read_buffer_mutex.unlock();
	return 0;
}


ssize_t PIPeer::writeDevice(const void * data, ssize_t size) {
	if (trust_peer.isEmpty()) {
		sendToAll(data, size);
		return size;
	}
	if (send(trust_peer, data, size))
		return size;
	else
		return -1;
}


void PIPeer::interrupt() {
	iterrupted = true;
}


void PIPeer::newTcpClient(PIEthernet * client) {
	client->setName("_S.PIPeer.TCP_ServerClient" + client->path());
	piCoutObj << "client" << client->path();
	CONNECT2(void, const uchar *, ssize_t, client, threadedReadEvent, this, mbcastRead);
	client->startThreadedRead();
}


PIString PIPeer::constructFullPathDevice() const {
	PIString ret;
	ret += self_info.name + ":" + trustPeerName();
	return ret;
}


void PIPeer::configureFromFullPathDevice(const PIString & full_path) {
	PIStringList pl = full_path.split(":");
	for (int i = 0; i < pl.size_s(); ++i) {
		PIString p(pl[i]);
		switch (i) {
		case 0: changeName(p); break;
		case 1: setTrustPeerName(p); break;
		}
	}
}


PIPropertyStorage PIPeer::constructVariantDevice() const {
	PIPropertyStorage ret;
	ret.addProperty("name", self_info.name);
	ret.addProperty("trust peer", trustPeerName());
	return ret;
}


void PIPeer::configureFromVariantDevice(const PIPropertyStorage & d) {
	changeName(d.propertyValueByName("name").toString());
	setTrustPeerName(d.propertyValueByName("trust peer").toString());
}


void PIPeer::initNetwork() {
	//	piCoutObj << "initNetwork ...";
	eth_send.init();
	destroyEths();
	destroyMBcasts();
	piMSleep(100);
	//	piCoutObj << self_info.addresses.size();
	self_info.addresses.clear();
	PIVector<PINetworkAddress> al = PIEthernet::allAddresses();
	PIStringList sl;
	for (const PINetworkAddress & a: al) {
		sl << a.ipString();
	}
	initEths(sl);
	//	piCoutObj << sl << self_info.addresses.size();
	sl.removeAll("127.0.0.1");
	initMBcasts(sl);
	diag_d.start();
	diag_s.start();
	//	piCoutObj << "initNetwork done";
}


void PIPeer::buildMap() {
	// piCout << "[PIPeer \"" + name_ + "\"] buildMap";
	peers_map.clear();
	addresses_map.clear();
	for (auto & i: peers) {
		i.trace           = -1;
		peers_map[i.name] = &i;
	}
	PIVector<PeerInfo *> cwave, nwave;
	int cwi         = 0;
	self_info.trace = 0;
	cwave << &self_info;
	while (!cwave.isEmpty()) {
		nwave.clear();
		++cwi;
		for (const auto * p: cwave) {
			for (const auto & nn: p->neighbours) {
				PeerInfo * np = peers_map.value(nn);
				if (!np) continue;
				if (np->trace >= 0) continue;
				np->trace = cwi;
				nwave << np;
			}
		}
		cwave = nwave;
	}
	PIVector<PeerInfo *> cpath;
	for (auto & c: peers) {
		cpath.clear();
		cpath << &c;
		cwave << &c;
		for (int w = c.trace - 1; w >= 0; --w) {
			nwave.clear();
			for (const auto * p: cwave) {
				for (const auto & nn: p->neighbours) {
					PeerInfo * np = peers_map.value(nn);
					if (!np) continue;
					if (np->trace != w) continue;
					cpath << np;
					nwave << np;
				}
			}
			cwave = nwave;
		}
		addresses_map[c.name] = cpath;
		// piCout << "map" << c.name << "=" << cpath;
	}
}


void PIPeer::tcpClientReconnect() {
	eth_tcp_cli.connect(server_ip, _PIPEER_TCP_PORT);
}


bool PIPeer::hasPeer(const PIString & name) {
	for (const auto & i: peers)
		if (i.name == name) return true;
	return false;
}