public UDPReceiver(
RouterContext ctx, UDPTransport transport, DatagramSocket socket, String name) {
_context = ctx;
_log = ctx.logManager().getLog(UDPReceiver.class);
_name = name;
_socket = socket;
_transport = transport;
_handler = transport.getPacketHandler();
if (_handler == null) throw new IllegalStateException();
_runner = new Runner();
// _context.statManager().createRateStat("udp.receivePacketSize", "How large packets received
// are", "udp", UDPTransport.RATES);
// _context.statManager().createRateStat("udp.receiveRemaining", "How many packets are left
// sitting on the receiver's queue", "udp", UDPTransport.RATES);
// _context.statManager().createRateStat("udp.droppedInbound", "How many packet are queued up
// but not yet received when we drop", "udp", UDPTransport.RATES);
_context
.statManager()
.createRateStat(
"udp.receiveHolePunch",
"How often we receive a NAT hole punch",
"udp",
UDPTransport.RATES);
_context
.statManager()
.createRateStat(
"udp.ignorePacketFromDroplist",
"Packet lifetime for those dropped on the drop list",
"udp",
UDPTransport.RATES);
}
/**
* BLOCKING if queue between here and PacketHandler is full.
*
* @return zero (was queue size)
*/
private final int doReceive(UDPPacket packet) {
if (!_keepRunning) return 0;
if (_log.shouldLog(Log.INFO)) _log.info("Received: " + packet);
RemoteHostId from = packet.getRemoteHost();
if (_transport.isInDropList(from)) {
if (_log.shouldLog(Log.INFO)) _log.info("Ignoring packet from the drop-listed peer: " + from);
_context.statManager().addRateData("udp.ignorePacketFromDroplist", packet.getLifetime());
packet.release();
return 0;
}
// drop anything apparently from our IP (any port)
if (Arrays.equals(from.getIP(), _transport.getExternalIP()) && !_transport.allowLocal()) {
if (_log.shouldLog(Log.WARN)) _log.warn("Dropping (spoofed?) packet from ourselves");
packet.release();
return 0;
}
/**
* ** packet.enqueue(); boolean rejected = false; int queueSize = 0; long headPeriod = 0;
*
* <p>UDPPacket head = _inboundQueue.peek(); if (head != null) { headPeriod =
* head.getLifetime(); if (headPeriod > MAX_QUEUE_PERIOD) { rejected = true; } } if (!rejected)
* { **
*/
try {
_handler.queueReceived(packet);
} catch (InterruptedException ie) {
packet.release();
_keepRunning = false;
}
// return queueSize + 1;
return 0;
/**
* ** }
*
* <p>// rejected packet.release(); _context.statManager().addRateData("udp.droppedInbound",
* queueSize, headPeriod); if (_log.shouldLog(Log.WARN)) { queueSize = _inboundQueue.size();
* StringBuilder msg = new StringBuilder(); msg.append("Dropping inbound packet with ");
* msg.append(queueSize); msg.append(" queued for "); msg.append(headPeriod); msg.append("
* packet handlers: ").append(_transport.getPacketHandlerStatus()); _log.warn(msg.toString()); }
* return queueSize; **
*/
}