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