Fetch DC ips from Telegram

mtglib/internal/telegram/rpc_client.go

@@ -0,0 +1,42 @@
+package telegram
+
+import (
+	"context"
+	"net"
+	"strconv"
+
+	"github.com/gotd/td/telegram"
+)
+
+type rpcClient struct {
+	*telegram.Client
+}
+
+func (r rpcClient) getDCAddresses(logger loggerInterface, ctx context.Context) (dcAddresses, error) {
+	addrs := dcAddresses{
+		v4: map[int][]tgAddr{},
+		v6: map[int][]tgAddr{},
+	}
+
+	err := r.Client.Run(ctx, func(_ context.Context) error {
+		for _, opt := range r.Client.Config().DCOptions {
+			addr := net.JoinHostPort(opt.IPAddress, strconv.Itoa(opt.Port))
+
+			if opt.Ipv6 {
+				addrs.v6[opt.ID] = append(addrs.v6[opt.ID], tgAddr{
+					network: "tcp6",
+					address: addr,
+				})
+			} else {
+				addrs.v4[opt.ID] = append(addrs.v4[opt.ID], tgAddr{
+					network: "tcp4",
+					address: addr,
+				})
+			}
+		}
+
+		return nil
+	})
+
+	return addrs, err
+}