func (s *server) upnpUpdateThread() {
// Go off immediately to prevent code duplication, thereafter we renew
// lease every 15 minutes.
timer := time.NewTimer(0 * time.Second)
lport, _ := strconv.ParseInt(activeNetParams.DefaultPort, 10, 16)
first := true
out:
for {
select {
case <-timer.C:
// TODO(oga) pick external port more cleverly
// TODO(oga) know which ports we are listening to on an external net.
// TODO(oga) if specific listen port doesn't work then ask for wildcard
// listen port?
// XXX this assumes timeout is in seconds.
listenPort, err := s.nat.AddPortMapping("tcp", int(lport), int(lport),
"btcd listen port", 20*60)
if err != nil {
srvrLog.Warnf("can't add UPnP port mapping: %v", err)
}
if first && err == nil {
// TODO(oga): look this up periodically to see if upnp domain changed
// and so did ip.
externalip, err := s.nat.GetExternalAddress()
if err != nil {
srvrLog.Warnf("UPnP can't get external address: %v", err)
continue out
}
na := wire.NewNetAddressIPPort(externalip, uint16(listenPort),
wire.SFNodeNetwork)
err = s.addrManager.AddLocalAddress(na, addrmgr.UpnpPrio)
if err != nil {
// XXX DeletePortMapping?
}
srvrLog.Warnf("Successfully bound via UPnP to %s", addrmgr.NetAddressKey(na))
first = false
}
timer.Reset(time.Minute * 15)
case <-s.quit:
break out
}
}
timer.Stop()
if err := s.nat.DeletePortMapping("tcp", int(lport), int(lport)); err != nil {
srvrLog.Warnf("unable to remove UPnP port mapping: %v", err)
} else {
srvrLog.Debugf("succesfully disestablished UPnP port mapping")
}
s.wg.Done()
}
// peerHandler is used to handle peer operations such as adding and removing
// peers to and from the server, banning peers, and broadcasting messages to
// peers. It must be run in a goroutine.
func (s *server) peerHandler() {
// Start the address manager and block manager, both of which are needed
// by peers. This is done here since their lifecycle is closely tied
// to this handler and rather than adding more channels to sychronize
// things, it's easier and slightly faster to simply start and stop them
// in this handler.
s.addrManager.Start()
s.blockManager.Start()
srvrLog.Tracef("Starting peer handler")
state := &peerState{
peers: list.New(),
persistentPeers: list.New(),
outboundPeers: list.New(),
banned: make(map[string]time.Time),
maxOutboundPeers: defaultMaxOutbound,
outboundGroups: make(map[string]int),
}
if cfg.MaxPeers < state.maxOutboundPeers {
state.maxOutboundPeers = cfg.MaxPeers
}
// Add peers discovered through DNS to the address manager.
s.seedFromDNS()
// Start up persistent peers.
permanentPeers := cfg.ConnectPeers
if len(permanentPeers) == 0 {
permanentPeers = cfg.AddPeers
}
for _, addr := range permanentPeers {
s.handleAddPeerMsg(state, newOutboundPeer(s, addr, true, 0))
}
// if nothing else happens, wake us up soon.
time.AfterFunc(10*time.Second, func() { s.wakeup <- struct{}{} })
out:
for {
select {
// New peers connected to the server.
case p := <-s.newPeers:
s.handleAddPeerMsg(state, p)
// Disconnected peers.
case p := <-s.donePeers:
s.handleDonePeerMsg(state, p)
// Peer to ban.
case p := <-s.banPeers:
s.handleBanPeerMsg(state, p)
// New inventory to potentially be relayed to other peers.
case invMsg := <-s.relayInv:
s.handleRelayInvMsg(state, invMsg)
// Message to broadcast to all connected peers except those
// which are excluded by the message.
case bmsg := <-s.broadcast:
s.handleBroadcastMsg(state, &bmsg)
// Used by timers below to wake us back up.
case <-s.wakeup:
// this page left intentionally blank
case qmsg := <-s.query:
s.handleQuery(qmsg, state)
// Shutdown the peer handler.
case <-s.quit:
// Shutdown peers.
state.forAllPeers(func(p *peer) {
p.Shutdown()
})
break out
}
// Don't try to connect to more peers when running on the
// simulation test network. The simulation network is only
// intended to connect to specified peers and actively avoid
// advertising and connecting to discovered peers.
if cfg.SimNet {
continue
}
// Only try connect to more peers if we actually need more.
if !state.NeedMoreOutbound() || len(cfg.ConnectPeers) > 0 ||
atomic.LoadInt32(&s.shutdown) != 0 {
continue
}
tries := 0
for state.NeedMoreOutbound() &&
atomic.LoadInt32(&s.shutdown) == 0 {
time.Sleep(time.Second / 10)
// We bias like bitcoind does, 10 for no outgoing
// up to 90 (8) for the selection of new vs tried
//addresses.
nPeers := state.OutboundCount()
if nPeers > 8 {
nPeers = 8
}
addr := s.addrManager.GetAddress("any", 10+nPeers*10)
if addr == nil {
break
}
key := addrmgr.GroupKey(addr.NetAddress())
// Address will not be invalid, local or unroutable
// because addrmanager rejects those on addition.
// Just check that we don't already have an address
// in the same group so that we are not connecting
// to the same network segment at the expense of
// others.
if state.outboundGroups[key] != 0 {
break
}
tries++
// After 100 bad tries exit the loop and we'll try again
// later.
if tries > 100 {
break
}
// XXX if we have limited that address skip
// only allow recent nodes (10mins) after we failed 30
// times
if time.Now().After(addr.LastAttempt().Add(10*time.Minute)) &&
tries < 30 {
continue
time.Sleep(time.Second)
}
// allow nondefault ports after 50 failed tries.
if fmt.Sprintf("%d", addr.NetAddress().Port) !=
activeNetParams.DefaultPort && tries < 50 {
continue
}
addrStr := addrmgr.NetAddressKey(addr.NetAddress())
tries = 0
// any failure will be due to banned peers etc. we have
// already checked that we have room for more peers.
if s.handleAddPeerMsg(state,
newOutboundPeer(s, addrStr, false, 0)) {
}
}
// We need more peers, wake up in ten seconds and try again.
if state.NeedMoreOutbound() {
time.AfterFunc(10*time.Second, func() {
s.wakeup <- struct{}{}
})
}
}
/*
if cfg.AddrIndex {
s.addrIndexer.Stop()
}
*/
s.blockManager.Stop()
s.addrManager.Stop()
s.wg.Done()
srvrLog.Tracef("Peer handler done")
}