commit inicial do projeto

internal/p2p/dht.go

@@ -0,0 +1,52 @@
+package p2p
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	dht "github.com/libp2p/go-libp2p-kad-dht"
+	routingdiscovery "github.com/libp2p/go-libp2p/p2p/discovery/routing"
+)
+
+const rendezvousString = "dejo-global"
+
+// InitDHT inicializa o Kademlia DHT e ativa descoberta global de peers.
+func (p *P2PNode) InitDHT(ctx context.Context) error {
+	d, err := dht.New(ctx, p.Host)
+	if err != nil {
+		return fmt.Errorf("erro ao iniciar DHT: %w", err)
+	}
+
+	if err := d.Bootstrap(ctx); err != nil {
+		return fmt.Errorf("erro ao bootstrap DHT: %w", err)
+	}
+
+	routing := routingdiscovery.NewRoutingDiscovery(d)
+	_, err = routing.Advertise(ctx, rendezvousString)
+	if err != nil {
+		return fmt.Errorf("erro ao anunciar no DHT: %w", err)
+	}
+
+	fmt.Println("📡 Anunciado no DHT com tag:", rendezvousString)
+
+	go func() {
+		for {
+			peers, err := routing.FindPeers(ctx, rendezvousString)
+			if err != nil {
+				fmt.Println("Erro ao buscar peers:", err)
+				continue
+			}
+			for pinfo := range peers {
+				if pinfo.ID == p.Host.ID() {
+					continue // ignora si mesmo
+				}
+				fmt.Println("🌍 Peer encontrado via DHT:", pinfo.ID)
+				_ = p.Host.Connect(ctx, pinfo)
+			}
+			time.Sleep(10 * time.Second)
+		}
+	}()
+
+	return nil
+}