p2p: add ENR to PeerInfo (#19816)

p2p/peer.go

@@ -427,6 +427,7 @@ func (rw *protoRW) ReadMsg() (Msg, error) {
 // peer. Sub-protocol independent fields are contained and initialized here, with
 // protocol specifics delegated to all connected sub-protocols.
 type PeerInfo struct {
+	ENR     string   `json:"enr,omitempty"` // Ethereum Node Record
 	Enode   string   `json:"enode"`         // Node URL
 	ID      string   `json:"id"`            // Unique node identifier
 	Name    string   `json:"name"`          // Name of the node, including client type, version, OS, custom data
@@ -450,12 +451,15 @@ func (p *Peer) Info() *PeerInfo {
 	}
 	// Assemble the generic peer metadata
 	info := &PeerInfo{
-		Enode:     p.Node().String(),
+		Enode:     p.Node().URLv4(),
 		ID:        p.ID().String(),
 		Name:      p.Name(),
 		Caps:      caps,
 		Protocols: make(map[string]interface{}),
 	}
+	if p.Node().Seq() > 0 {
+		info.ENR = p.Node().String()
+	}
 	info.Network.LocalAddress = p.LocalAddr().String()
 	info.Network.RemoteAddress = p.RemoteAddr().String()
 	info.Network.Inbound = p.rw.is(inboundConn)