An interactive go-libp2p node. Pings a provided multiaddr. Start it and type: ping <multiaddr-with-p2p>

main.go

package main

import (
	"bufio"
	"context"
	"fmt"
	"os"
	"strings"

	"github.com/libp2p/go-libp2p"
	"github.com/libp2p/go-libp2p/core/peer"
	"github.com/libp2p/go-libp2p/p2p/protocol/ping"
)

func main() {
	return
	h, err := libp2p.New()
	if err != nil {
		panic(err)
	}
	defer h.Close()

	// Read line from stdin:
	reader := bufio.NewReader(os.Stdin)
	for {
		input, err := reader.ReadString('\n')
		if err != nil {
			fmt.Println("err reading input:", err)
			continue
		}

		parts := strings.SplitN(input, " ", 2)
		switch parts[0] {
		case "ping":
			// Ping the peer:
			multiaddrStr := strings.Trim(parts[1], " \n")
			peerAddr, err := peer.AddrInfoFromString(multiaddrStr)
			if err != nil {
				fmt.Println("error parsing peer address:", err)
				continue
			}
			err = h.Connect(context.Background(), *peerAddr)
			if err != nil {
				fmt.Println("error connecting to peer:", err)
				continue
			}
			ctx, cancel := context.WithCancel(context.Background())
			p := ping.Ping(ctx, h, peerAddr.ID)
			res := <-p
			cancel()
			if res.Error != nil {
				fmt.Println("ping error:", res.Error)
				continue
			}
			fmt.Println("ping result:", res.RTT)
		}
	}
}