func (player *Player) mainLoop() {
defer func() {
// Close the transmitLoop and receiveLoop cleanly.
player.txQueue <- nil
player.conn.Close()
player.onDisconnect <- player.EntityId
if player.ping.timer != nil {
player.ping.timer.Stop()
}
buf := new(bytes.Buffer)
proto.WriteUserListItem(buf, player.name, false, 0)
player.game.BroadcastPacket(buf.Bytes())
}()
expVarPlayerConnectionCount.Add(1)
defer expVarPlayerDisconnectionCount.Add(1)
player.chunkSubs.Init(player)
defer player.chunkSubs.Close()
// Start the keep-alive/latency pings.
player.pingNew()
player.sendChatMessage(fmt.Sprintf("%s has joined", player.name), false)
MAINLOOP:
for {
select {
case _ = <-player.stopPlayer:
break MAINLOOP
case f, ok := <-player.mainQueue:
if !ok {
return
}
player.runQueuedCall(f)
case _ = <-player.ping.timer.C:
player.pingTimeout()
case err := <-player.rxErrChan:
log.Printf("%v: receive loop failed: %v", player, err)
player.Stop()
case err := <-player.txErrChan:
log.Printf("%v: send loop failed: %v", player, err)
player.Stop()
}
}
}
// pingReceived is called when a keep alive packet is received.
func (player *Player) pingReceived(id int32) {
if id == 0 {
// Client-initiated keep-alive.
return
}
if *playerPingNoCheck {
if !player.ping.running {
return
}
} else {
if !player.ping.running {
log.Printf("%v: Received keep-alive id=%d when none was running", player, id)
player.Stop()
return
} else if id != player.ping.id {
log.Printf("%v: Bad keep alive ID received", player)
player.Stop()
return
}
}
// Received valid keep-alive.
now := time.Now()
if player.ping.timer != nil {
player.ping.timer.Stop()
}
latencyNs := now.Sub(time.Unix(0, player.ping.timestampNs))
// Check that there wasn't an apparent time-shift on this before broadcasting
// this latency value.
if latencyNs >= 0 && latencyNs < PingTimeoutNs {
buf := new(bytes.Buffer)
proto.WriteUserListItem(buf, player.name, true, int16(latencyNs/1e6))
player.game.BroadcastPacket(buf.Bytes())
}
player.ping.running = false
player.ping.id = 0
player.ping.timer = time.NewTimer(PingIntervalNs)
}