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p2p.go
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p2p.go
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package p2p
import (
"context"
"crypto/rand"
"encoding/hex"
"fmt"
"strings"
"time"
"github.com/NethermindEth/juno/utils"
"github.com/libp2p/go-libp2p"
dht "github.com/libp2p/go-libp2p-kad-dht"
"github.com/libp2p/go-libp2p/core/crypto"
"github.com/libp2p/go-libp2p/core/event"
"github.com/libp2p/go-libp2p/core/host"
p2pnet "github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/protocol"
"github.com/multiformats/go-multiaddr"
)
const (
defaultSourcePort = 30301
keyLength = 2048
routingTableRefreshPeriod = 10 * time.Second
)
type Service struct {
host host.Host
bootPeers string
network utils.Network
dht *dht.IpfsDHT
log utils.SimpleLogger
}
func New(
addr,
userAgent string,
bootPeers string,
privKeyStr string,
network utils.Network,
log utils.SimpleLogger,
) (*Service, error) {
if addr == "" {
// 0.0.0.0 will listen on any interface device.
addr = fmt.Sprintf("/ip4/0.0.0.0/tcp/%d", defaultSourcePort)
}
sourceMultiAddr, err := multiaddr.NewMultiaddr(addr)
if err != nil {
return nil, err
}
prvKey, err := privateKey(privKeyStr)
if err != nil {
return nil, err
}
p2phost, err := libp2p.New(
libp2p.ListenAddrs(sourceMultiAddr),
libp2p.Identity(prvKey),
libp2p.UserAgent(userAgent),
)
if err != nil {
return nil, err
}
p2pdht, err := makeDHT(p2phost, network, bootPeers)
if err != nil {
return nil, err
}
return &Service{
bootPeers: bootPeers,
log: log,
host: p2phost,
network: network,
dht: p2pdht,
}, nil
}
func makeDHT(p2phost host.Host, network utils.Network, cfgBootPeers string) (*dht.IpfsDHT, error) {
bootPeers := []peer.AddrInfo{}
if cfgBootPeers != "" {
splitted := strings.Split(cfgBootPeers, ",")
for _, peerStr := range splitted {
bootAddr, err := peer.AddrInfoFromString(peerStr)
if err != nil {
return nil, err
}
bootPeers = append(bootPeers, *bootAddr)
}
}
protocolPrefix := protocol.ID(fmt.Sprintf("/starknet/%s", network.String()))
return dht.New(context.Background(), p2phost,
dht.ProtocolPrefix(protocolPrefix),
dht.BootstrapPeers(bootPeers...),
dht.RoutingTableRefreshPeriod(routingTableRefreshPeriod),
dht.Mode(dht.ModeServer),
)
}
func privateKey(privKeyStr string) (crypto.PrivKey, error) {
if privKeyStr == "" {
// Creates a new key pair for this host.
prvKey, _, err := crypto.GenerateKeyPairWithReader(crypto.Ed25519, keyLength, rand.Reader)
if err != nil {
return nil, err
}
return prvKey, nil
}
privKeyBytes, err := hex.DecodeString(privKeyStr)
if err != nil {
return nil, err
}
prvKey, err := crypto.UnmarshalPrivateKey(privKeyBytes)
if err != nil {
return nil, err
}
return prvKey, nil
}
func (s *Service) SubscribePeerConnectednessChanged(ctx context.Context) (<-chan event.EvtPeerConnectednessChanged, error) {
ch := make(chan event.EvtPeerConnectednessChanged)
sub, err := s.host.EventBus().Subscribe(&event.EvtPeerConnectednessChanged{})
if err != nil {
return nil, err
}
go func() {
for {
select {
case <-ctx.Done():
if err = sub.Close(); err != nil {
s.log.Warnw("Failed to close subscription", "err", err)
}
close(ch)
return
case evnt := <-sub.Out():
typedEvnt := evnt.(event.EvtPeerConnectednessChanged)
if typedEvnt.Connectedness == p2pnet.Connected {
ch <- typedEvnt
}
}
}
}()
return ch, nil
}
func (s *Service) Run(ctx context.Context) error {
err := s.dht.Bootstrap(ctx)
if err != nil {
return err
}
listenAddrs, err := s.ListenAddrs()
if err != nil {
return err
}
for _, addr := range listenAddrs {
s.log.Infow("Listening on", "addr", addr)
}
<-ctx.Done()
if err := s.dht.Close(); err != nil {
s.log.Warnw("Failed stopping DHT", "err", err.Error())
}
return s.host.Close()
}
func (s *Service) ListenAddrs() ([]multiaddr.Multiaddr, error) {
pidmhash, err := multiaddr.NewMultiaddr(fmt.Sprintf("/p2p/%s", s.host.ID().String()))
if err != nil {
return nil, err
}
var listenAddrs []multiaddr.Multiaddr
for _, addr := range s.host.Addrs() {
listenAddrs = append(listenAddrs, addr.Encapsulate(pidmhash))
}
return listenAddrs, nil
}