p2p: Added log for --p2p-host-ip (#4553)

* added log for external addr
* Merge branch 'master' into log-p2p-address
* Merge branch 'master' into log-p2p-address
* Merge branch 'master' into log-p2p-address

beacon-chain/p2p/service.go

@@ -3,6 +3,7 @@ package p2p
 import (
 	"context"
 	"crypto/ecdsa"
+	"strconv"
 	"strings"
 	"time"
 
@@ -213,6 +214,10 @@ func (s *Service) Start() {
 
 	multiAddrs := s.host.Network().ListenAddresses()
 	logIP4Addr(s.host.ID(), multiAddrs...)
+
+	p2pHostAddress := s.cfg.HostAddress
+	p2pTCPPort := s.cfg.TCPPort
+	logExternalIP4Addr(s.host.ID(), p2pHostAddress, p2pTCPPort)
 }
 
 // Stop the p2p service and terminate all peer connections.
@@ -364,3 +369,14 @@ func logIP4Addr(id peer.ID, addrs ...ma.Multiaddr) {
 		).Info("Node started p2p server")
 	}
 }
+
+func logExternalIP4Addr(id peer.ID, addr string, port uint) {
+	if addr != "" {
+		p := strconv.FormatUint(uint64(port), 10)
+
+		log.WithField(
+			"multiAddr",
+			"/ip4/"+addr+"/tcp/"+p+"/p2p/"+id.String(),
+		).Info("Node started external p2p server")
+	}
+}