gistfile1.txt

// Copyright © 2018 Weald Technology Trading
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"context"
	"fmt"
	"os"
	"os/signal"
	"syscall"

	p2pcrypto "github.com/libp2p/go-libp2p-crypto"
	p2ppeer "github.com/libp2p/go-libp2p-peer"
	p2ppeerstore "github.com/libp2p/go-libp2p-peerstore"
	p2pswarm "github.com/libp2p/go-libp2p-swarm"
	p2pbasic "github.com/libp2p/go-libp2p/p2p/host/basic"
	p2pmultiaddr "github.com/multiformats/go-multiaddr"
)

func main() {
	// Create a keypair
	priv, pub, err := p2pcrypto.GenerateKeyPair(p2pcrypto.Secp256k1, 256)
	if err != nil {
		panic(err)
	}

	// Use public key to create our node's Id
	pid, err := p2ppeer.IDFromPublicKey(pub)
	if err != nil {
		panic(err)
	}

	listen, err := p2pmultiaddr.NewMultiaddr("/ip4/0.0.0.0/tcp/15432")
	if err != nil {
		panic(err)
	}

	peerStore := p2ppeerstore.NewPeerstore()
	peerStore.AddPrivKey(pid, priv)
	peerStore.AddPubKey(pid, pub)
	network, err := p2pswarm.NewNetwork(context.Background(), []p2pmultiaddr.Multiaddr{listen}, pid, peerStore, nil)
	if err != nil {
		panic(err)
	}

	hostOpts := &p2pbasic.HostOpts{}
	host, err := p2pbasic.NewHost(context.Background(), network, hostOpts)
	if err != nil {
		panic(err)
	}
	fmt.Printf("Node ID is %s\n", p2ppeer.IDB58Encode(host.ID()))

	interrupt := make(chan os.Signal, 1)
	signal.Notify(interrupt, os.Interrupt, os.Kill, syscall.SIGTERM)

	for {
		select {
		case killSignal := <-interrupt:
			if killSignal == os.Interrupt {
				fmt.Println("Interrupted")
			}
			fmt.Println("Shutting down")
			return
		}
	}
}