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mylibp2p.go
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mylibp2p.go
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package mylibp2p
import (
"context"
"crypto/rand"
"fmt"
"github.com/blinkspark/golab/mylibp2p/config"
"github.com/blinkspark/golab/util"
"github.com/libp2p/go-libp2p"
"github.com/libp2p/go-libp2p-crypto"
"github.com/libp2p/go-libp2p-host"
"github.com/libp2p/go-libp2p-peer"
"github.com/libp2p/go-libp2p-peerstore"
"github.com/multiformats/go-multiaddr"
)
func makeRandomHost(port int32) (host.Host, crypto.PrivKey, error) {
listenAddr := fmt.Sprintf("/ip4/0.0.0.0/tcp/%d", port)
privKey, _, err := crypto.GenerateKeyPairWithReader(crypto.RSA, 2048, rand.Reader)
if err != nil {
return nil, nil, err
}
h, err := libp2p.New(context.Background(),
libp2p.Identity(privKey),
libp2p.NATPortMap(),
libp2p.EnableRelay(0, 1),
libp2p.ListenAddrStrings(listenAddr))
if err != nil {
return nil, nil, err
}
return h, privKey, nil
}
func makeHostFromConfig(c *config.Config) (host.Host, error) {
privKeyData, err := crypto.ConfigDecodeKey(c.PrivKey)
if err != nil {
return nil, err
}
privKey, err := crypto.UnmarshalPrivateKey(privKeyData)
if err != nil {
return nil, err
}
listenAddr := fmt.Sprintf("/ip4/0.0.0.0/tcp/%d", c.Port)
h, err := libp2p.New(context.Background(),
libp2p.NATPortMap(),
libp2p.Identity(privKey),
libp2p.EnableRelay(0, 1),
libp2p.ListenAddrStrings(listenAddr))
if err != nil {
return nil, err
}
for _, p := range c.Peers {
id, err := peer.IDB58Decode(p.ID)
util.CheckErr(err)
for _, a := range p.Addrs {
ma := multiaddr.StringCast(a)
h.Peerstore().AddAddr(id, ma, peerstore.PermanentAddrTTL)
}
}
return h, nil
}
func InitHost() (host.Host, error) {
hConfig, err := config.ReadConfig()
if err != nil {
newHost, privKey, err := makeRandomHost(config.DefaultPort)
if err != nil {
return nil, err
}
config.SaveConfigByData(newHost, privKey)
return newHost, nil
}
return makeHostFromConfig(hConfig)
}