70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package utils
|
|
|
|
import (
|
|
"context"
|
|
"crypto/rand"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
mrand "math/rand"
|
|
|
|
"github.com/libp2p/go-libp2p"
|
|
"github.com/libp2p/go-libp2p-core/crypto"
|
|
"github.com/libp2p/go-libp2p-core/host"
|
|
|
|
ma "github.com/multiformats/go-multiaddr"
|
|
)
|
|
|
|
// MakeBasicHost creates a LibP2P host with a random peer ID listening on the
|
|
// given multiaddress. It won't encrypt the connection if insecure is true.
|
|
func MakeBasicHost(listenPort int, insecure bool, randseed int64) (host.Host, error) {
|
|
|
|
// If the seed is zero, use real cryptographic randomness. Otherwise, use a
|
|
// deterministic randomness source to make generated keys stay the same
|
|
// across multiple runs
|
|
var r io.Reader
|
|
if randseed == 0 {
|
|
r = rand.Reader
|
|
} else {
|
|
r = mrand.New(mrand.NewSource(randseed))
|
|
}
|
|
|
|
// Generate a key pair for this host. We will use it at least
|
|
// to obtain a valid host ID.
|
|
priv, _, err := crypto.GenerateKeyPairWithReader(crypto.RSA, 2048, r)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
opts := []libp2p.Option{
|
|
libp2p.ListenAddrStrings(fmt.Sprintf("/ip4/127.0.0.1/tcp/%d", listenPort)),
|
|
libp2p.Identity(priv),
|
|
libp2p.DisableRelay(),
|
|
}
|
|
|
|
if insecure {
|
|
opts = append(opts, libp2p.NoSecurity)
|
|
}
|
|
|
|
basicHost, err := libp2p.New(context.Background(), opts...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Build host multiaddress
|
|
hostAddr, _ := ma.NewMultiaddr(fmt.Sprintf("/ipfs/%s", basicHost.ID().Pretty()))
|
|
|
|
// Now we can build a full multiaddress to reach this host
|
|
// by encapsulating both addresses:
|
|
addr := basicHost.Addrs()[0]
|
|
fullAddr := addr.Encapsulate(hostAddr)
|
|
log.Printf("I am %s\n", fullAddr)
|
|
if insecure {
|
|
log.Printf("Now run \"./echo -l %d -d %s -insecure\" on a different terminal\n", listenPort+1, fullAddr)
|
|
} else {
|
|
log.Printf("Now run \"./echo -l %d -d %s\" on a different terminal\n", listenPort+1, fullAddr)
|
|
}
|
|
|
|
return basicHost, nil
|
|
}
|