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disc_inbound_peer_listener.go
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disc_inbound_peer_listener.go
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package messenger
import (
"context"
"fmt"
"net"
"strconv"
"sync"
"time"
"github.com/spf13/viper"
"github.com/dnerochain/dnero/common"
"github.com/dnerochain/dnero/p2p/netutil"
pr "github.com/dnerochain/dnero/p2p/peer"
gonetutil "golang.org/x/net/netutil"
)
const (
defaultExternalPort = 7650
tryListenSeconds = 5
)
//
// InboundPeerListener models a listener for inbound peer connections
//
type InboundPeerListener struct {
discMgr *PeerDiscoveryManager
netListener net.Listener
internalAddr *netutil.NetAddress
externalAddr *netutil.NetAddress
inboundCallback InboundCallback
config InboundPeerListenerConfig
// Life cycle
wg *sync.WaitGroup
quit chan struct{}
ctx context.Context
cancel context.CancelFunc
stopped bool
}
//
// InboundPeerListenerConfig specifies the configuration for the PeerListener instance
//
type InboundPeerListenerConfig struct {
numBufferedConnections int
}
// InboundCallback is called when an inbound peer is created
type InboundCallback func(peer *pr.Peer, err error)
// createInboundPeerListener creates a new inbound peer listener instance
func createInboundPeerListener(discMgr *PeerDiscoveryManager, protocol string, localAddr string, externalPort int,
skipUPNP bool, config InboundPeerListenerConfig) (InboundPeerListener, error) {
localAddrIP, _ := splitHostPort(localAddr)
netListener := initiateNetListener(protocol, localAddr)
netListenerIP, netListenerPort := splitHostPort(netListener.Addr().String())
logger.Infof("Local network listener, ip: %v, port: %v", netListenerIP, netListenerPort)
internalNetAddr := getInternalNetAddress(localAddr)
externalNetAddr := getExternalNetAddress(localAddrIP, externalPort, netListenerPort, skipUPNP)
inboundPeerListener := InboundPeerListener{
discMgr: discMgr,
netListener: netListener,
internalAddr: internalNetAddr,
externalAddr: externalNetAddr,
config: config,
wg: &sync.WaitGroup{},
}
return inboundPeerListener, nil
}
// GetDefaultInboundPeerListenerConfig returns the default configuration for the listeners
func GetDefaultInboundPeerListenerConfig() InboundPeerListenerConfig {
return InboundPeerListenerConfig{
numBufferedConnections: 10,
}
}
// Start is called when the InboundPeerListener instance starts
func (ipl *InboundPeerListener) Start(ctx context.Context) error {
c, cancel := context.WithCancel(ctx)
ipl.ctx = c
ipl.cancel = cancel
ipl.wg.Add(1)
go ipl.listenRoutine()
return nil
}
// Stop is called when the InboundPeerListener instance stops
func (ipl *InboundPeerListener) Stop() {
ipl.netListener.Close()
ipl.cancel()
}
// Wait suspends the caller goroutine
func (ipl *InboundPeerListener) Wait() {
ipl.wg.Wait()
}
// SetInboundCallback sets the inbound callback function
func (ipl *InboundPeerListener) SetInboundCallback(incb InboundCallback) {
ipl.inboundCallback = incb
}
func (ipl *InboundPeerListener) listenRoutine() {
defer ipl.wg.Done()
seedPeerOnly := viper.GetBool(common.CfgP2PSeedPeerOnly)
maxNumPeers := GetDefaultPeerDiscoveryManagerConfig().MaxNumPeers
logger.Infof("InboundPeerListener listen routine started, seedPeerOnly set to %v", seedPeerOnly)
for {
netconn, err := ipl.netListener.Accept()
if err != nil {
logger.Fatalf("net listener error: %v", err)
}
remoteAddr := netutil.NewNetAddress(netconn.RemoteAddr())
if seedPeerOnly {
isNotASeedPeer := !ipl.discMgr.seedPeerConnector.isASeedPeerIgnoringPort(remoteAddr)
if isNotASeedPeer {
logger.Debugf("%v is not a seed peer, ignore inbound connection request", remoteAddr.String())
netconn.Close()
continue
} else {
logger.Infof("Accept inbound connection from seed peer %v", remoteAddr.String())
}
} else {
numPeers := int(ipl.discMgr.peerTable.GetTotalNumPeers())
if numPeers >= maxNumPeers {
if viper.GetBool(common.CfgP2PConnectionFIFO) {
purgedPeer := ipl.discMgr.peerTable.PurgeOldestPeer()
if purgedPeer != nil {
purgedPeer.Stop()
logger.Infof("Purged old peer %v to make room for inbound connection request from %v", purgedPeer.ID(), remoteAddr.String())
}
} else {
logger.Debugf("Max peers limit %v reached, ignore inbound connection request from %v", maxNumPeers, remoteAddr.String())
netconn.Close()
continue
}
}
}
go func(netconn net.Conn) {
peer, err := ipl.discMgr.connectWithInboundPeer(netconn, true)
if err != nil {
netconn.Close()
}
if ipl.inboundCallback != nil {
ipl.inboundCallback(peer, err)
}
}(netconn)
}
}
// InternalAddress returns the internal address of the current node
func (ipl *InboundPeerListener) InternalAddress() *netutil.NetAddress {
return ipl.internalAddr
}
// ExternalAddress returns the external address of the current node
func (ipl *InboundPeerListener) ExternalAddress() *netutil.NetAddress {
return ipl.externalAddr
}
// NetListener returns the attached network listener
func (ipl *InboundPeerListener) NetListener() net.Listener {
return ipl.netListener
}
func (ipl *InboundPeerListener) String() string {
return fmt.Sprintf("InboundPeerListener(@%v)", ipl.externalAddr)
}
func splitHostPort(addr string) (host string, port int) {
host, portStr, err := net.SplitHostPort(addr)
if err != nil {
logger.Fatalf("failed to split host and port for: %v, err: %v", addr, err)
}
port, err = strconv.Atoi(portStr)
if err != nil {
logger.Fatalf("failed to extract port for: %v, err: %v", addr, err)
}
return host, port
}
func initiateNetListener(protocol string, localAddr string) (netListener net.Listener) {
var err error
for i := 0; i < tryListenSeconds; i++ {
netListener, err = net.Listen(protocol, localAddr)
if err == nil {
break
} else if i < tryListenSeconds-1 {
time.Sleep(time.Second)
}
}
if err != nil {
logger.Fatalf("Failed to initiate net listener: %v", err)
}
ll := gonetutil.LimitListener(netListener, viper.GetInt(common.CfgP2PMaxConnections))
netListener = ll
return netListener
}
func getInternalNetAddress(localAddr string) *netutil.NetAddress {
internalAddr, err := netutil.NewNetAddressString(localAddr)
if err != nil {
logger.Fatalf("Failed to get internal network address: %v", err)
}
return internalAddr
}
func getExternalNetAddress(localAddrIP string, externalPort int, listenerPort int, skipUPNP bool) *netutil.NetAddress {
var externalAddr *netutil.NetAddress
if !skipUPNP {
// If the lAddrIP is INADDR_ANY, try UPNP
if localAddrIP == "" || localAddrIP == "0.0.0.0" {
externalAddr = getUPNPExternalAddress(externalPort, listenerPort)
}
}
// Otherwise just use the local address
if externalAddr == nil {
externalAddr = getNaiveExternalAddress(listenerPort)
}
if externalAddr == nil {
logger.Fatalf("Could not determine external address!")
}
return externalAddr
}
func getUPNPExternalAddress(externalPort, internalPort int) *netutil.NetAddress {
logger.Infof("Getting UPNP external address")
nat, err := netutil.Discover()
if err != nil {
logger.Infof("Could not perform UPNP discover: %v", err)
return nil
}
ext, err := nat.GetExternalAddress()
if err != nil {
logger.Infof("Could not get UPNP external address: %v", err)
return nil
}
if externalPort == 0 { // Cannot get external port from UPNP, use the default port
externalPort = defaultExternalPort
}
externalPort, err = nat.AddPortMapping("tcp", externalPort, internalPort, "dnero", 0)
if err != nil {
logger.Infof("Could not add UPNP port mapping: %v", err)
return nil
}
logger.Infof("Got UPNP external address: %v", ext)
return netutil.NewNetAddressIPPort(ext, uint16(externalPort))
}
func getNaiveExternalAddress(port int) *netutil.NetAddress {
addrs, err := net.InterfaceAddrs()
if err != nil {
logger.Fatalf("Could not fetch interface addresses: %v", err)
}
for _, a := range addrs {
ipnet, ok := a.(*net.IPNet)
if !ok {
continue
}
v4 := ipnet.IP.To4()
if v4 == nil || v4[0] == 127 {
continue
} // loopback
return netutil.NewNetAddressIPPort(ipnet.IP, uint16(port))
}
return nil
}