api/gateway/chain/internal/service/gateway/driver/tron/driver.go

@@ -2,6 +2,7 @@ package tron
 
 import (
 	"context"
+	"strings"
 
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/tech/sendico/gateway/chain/internal/service/gateway/driver"
@@ -113,6 +114,9 @@ func (d *Driver) EstimateFee(ctx context.Context, deps driver.Deps, network shar
 	if wallet == nil {
 		return nil, merrors.InvalidArgument("wallet is required")
 	}
+	if amount == nil {
+		return nil, merrors.InvalidArgument("amount is required")
+	}
 	d.logger.Debug("Estimate fee request",
 		zap.String("wallet_ref", wallet.WalletRef),
 		zap.String("network", network.Name),
@@ -134,6 +138,12 @@ func (d *Driver) EstimateFee(ctx context.Context, deps driver.Deps, network shar
 		)
 		return nil, err
 	}
+	if rpcFrom == rpcTo {
+		return &moneyv1.Money{
+			Currency: nativeCurrency(network),
+			Amount:   "0",
+		}, nil
+	}
 	driverDeps := deps
 	driverDeps.Logger = d.logger
 	result, err := evm.EstimateFee(ctx, driverDeps, network, wallet, rpcFrom, rpcTo, amount)
@@ -220,4 +230,12 @@ func (d *Driver) AwaitConfirmation(ctx context.Context, deps driver.Deps, networ
 	return receipt, err
 }
 
+func nativeCurrency(network shared.Network) string {
+	currency := strings.ToUpper(strings.TrimSpace(network.NativeToken))
+	if currency == "" {
+		currency = strings.ToUpper(strings.TrimSpace(network.Name))
+	}
+	return currency
+}
+
 var _ driver.Driver = (*Driver)(nil)

api/gateway/chain/internal/service/gateway/driver/tron/driver_test.go

@@ -0,0 +1,33 @@
+package tron
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/tech/sendico/gateway/chain/internal/service/gateway/driver"
+	"github.com/tech/sendico/gateway/chain/internal/service/gateway/shared"
+	"github.com/tech/sendico/gateway/chain/storage/model"
+	moneyv1 "github.com/tech/sendico/pkg/proto/common/money/v1"
+	"go.uber.org/zap"
+)
+
+func TestEstimateFeeSelfTransferReturnsZero(t *testing.T) {
+	logger := zap.NewNop()
+	d := New(logger)
+	wallet := &model.ManagedWallet{
+		WalletRef:      "wallet_ref",
+		DepositAddress: "TGBDXEg9rxSqGFJDcb889zqTjDwx1bmLRF",
+	}
+	network := shared.Network{
+		Name:        "tron_mainnet",
+		NativeToken: "TRX",
+	}
+	amount := &moneyv1.Money{Currency: "TRX", Amount: "1000000"}
+
+	fee, err := d.EstimateFee(context.Background(), driver.Deps{}, network, wallet, wallet.DepositAddress, amount)
+	require.NoError(t, err)
+	require.NotNil(t, fee)
+	require.Equal(t, "TRX", fee.GetCurrency())
+	require.Equal(t, "0", fee.GetAmount())
+}

api/gateway/chain/internal/service/gateway/rpcclient/clients.go

@@ -2,6 +2,7 @@ package rpcclient
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
@@ -175,11 +176,16 @@ func (l *loggingRoundTripper) RoundTrip(req *http.Request) (*http.Response, erro
 	respFields := append(fields,
 		zap.Int("status_code", resp.StatusCode),
 	)
+	if contentType := strings.TrimSpace(resp.Header.Get("Content-Type")); contentType != "" {
+		respFields = append(respFields, zap.String("content_type", contentType))
+	}
 	if len(bodyBytes) > 0 {
 		respFields = append(respFields, zap.String("rpc_response", truncate(string(bodyBytes), 2048)))
 	}
 	if resp.StatusCode >= 400 {
 		l.logger.Warn("RPC response error", respFields...)
+	} else if len(bodyBytes) > 0 && !json.Valid(bodyBytes) {
+		l.logger.Warn("RPC response invalid JSON", respFields...)
 	}
 
 	return resp, nil

api/gateway/chain/internal/service/gateway/transfer_execution.go

@@ -24,7 +24,7 @@ func (s *Service) launchTransferExecution(transferRef, sourceWalletRef string, n
 		defer cancel()
 
 		if err := s.executeTransfer(ctx, ref, walletRef, net); err != nil {
-			s.logger.Warn("failed to execute transfer", zap.String("transfer_ref", ref), zap.Error(err))
+			s.logger.Warn("Failed to execute transfer", zap.String("transfer_ref", ref), zap.Error(err))
 		}
 	}(transferRef, sourceWalletRef, network)
 }
@@ -57,6 +57,23 @@ func (s *Service) executeTransfer(ctx context.Context, transferRef, sourceWallet
 		return err
 	}
 
+	sourceAddress, err := chainDriver.NormalizeAddress(sourceWallet.DepositAddress)
+	if err != nil {
+		_, _ = s.storage.Transfers().UpdateStatus(ctx, transferRef, model.TransferStatusFailed, err.Error(), "")
+		return err
+	}
+	if chainDriver.Name() == "tron" && sourceAddress == destinationAddress {
+		s.logger.Info("Self transfer detected; skipping submission",
+			zap.String("transfer_ref", transferRef),
+			zap.String("wallet_ref", sourceWalletRef),
+			zap.String("network", network.Name),
+		)
+		if _, err := s.storage.Transfers().UpdateStatus(ctx, transferRef, model.TransferStatusConfirmed, "", ""); err != nil {
+			s.logger.Warn("Failed to update transfer status to confirmed", zap.String("transfer_ref", transferRef), zap.Error(err))
+		}
+		return nil
+	}
+
 	txHash, err := chainDriver.SubmitTransfer(ctx, driverDeps, network, transfer, sourceWallet, destinationAddress)
 	if err != nil {
 		_, _ = s.storage.Transfers().UpdateStatus(ctx, transferRef, model.TransferStatusFailed, err.Error(), "")