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dht.go
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dht.go
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package ep2p
import (
"sync"
dht "github.com/libp2p/go-libp2p-kad-dht"
// dual "github.com/libp2p/go-libp2p-kad-dht/dual"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/p2p/discovery/routing"
"github.com/libp2p/go-libp2p/p2p/discovery/util"
"go.uber.org/zap"
)
type DHT struct {
// kademliaDHT *dual.DHT
kademliaDHT *dht.IpfsDHT
routingDiscovery *routing.RoutingDiscovery
host *Host
logger *zap.Logger
}
func newDHT(host *Host, logger *zap.Logger, serverMode bool) *DHT {
logger = logger.Named("DHT")
// For test.
// var kademliaDHT *dual.DHT
// var err error
// if !serverMode {
// kademliaDHT, err = dual.New(host.ctx, host.h, dual.DHTOption(dht.Mode(dht.ModeClient)))
// } else {
// kademliaDHT, err = dual.New(host.ctx, host.h, dual.DHTOption(dht.Mode(dht.ModeServer)))
// }
var kademliaDHT *dht.IpfsDHT
var err error
if !serverMode {
kademliaDHT, err = dht.New(host.ctx, host.impl, dht.Mode(dht.ModeClient), dht.ProtocolPrefix("/ep2p/dht/1.0"))
} else {
kademliaDHT, err = dht.New(host.ctx, host.impl, dht.Mode(dht.ModeServer), dht.ProtocolPrefix("/ep2p/dht/1.0"))
}
// kademliaDHT, err := dht.New(host.ctx, host.h, dht.Mode(dht.ModeAutoServer))
if err != nil {
panic(err)
}
if err = kademliaDHT.Bootstrap(host.ctx); err != nil {
panic(err)
}
var wg sync.WaitGroup
for _, peerAddr := range host.bootstrapPeers {
wg.Add(1)
peerInfo, _ := peer.AddrInfoFromP2pAddr(peerAddr)
go func() {
defer wg.Done()
if err := host.impl.Connect(host.ctx, *peerInfo); err != nil {
logger.Info("failed to connect to bootstrap peer", zap.Error(err))
} else {
logger.Info("connected to bootstrap peer", zap.String("peer", peerInfo.String()))
}
}()
}
wg.Wait()
return &DHT{
kademliaDHT: kademliaDHT,
routingDiscovery: routing.NewRoutingDiscovery(kademliaDHT),
host: host,
logger: logger,
}
}
func (dht *DHT) Advertise(ns string) error {
util.Advertise(dht.host.ctx, dht.routingDiscovery, ns)
return nil
}
func (dht *DHT) FindPeers(rendezvous string) (<-chan peer.AddrInfo, error) {
return dht.routingDiscovery.FindPeers(dht.host.ctx, rendezvous)
}