eth/nodeclient: Set contract nonces manually.

The v0 contract will reuse account nonces if the tx is not yet
confirmed. To avoid that get the next nonce from the light eth node pool
api while holding the nodeClient nonceSendMtx and set manually. Hold the
mutex until the tx has been sent or errors on sending.

client/asset/eth/nodeclient.go

@@ -410,6 +410,13 @@ func (n *nodeClient) initiate(ctx context.Context, contracts []*asset.Contract,
 		val += c.Value
 	}
 	txOpts, _ := n.txOpts(ctx, val, gas, dexeth.GweiToWei(maxFeeRate))
+	n.nonceSendMtx.Lock()
+	defer n.nonceSendMtx.Unlock()
+	nonce, err := n.leth.ApiBackend.GetPoolNonce(ctx, n.creds.addr)
+	if err != nil {
+		return nil, fmt.Errorf("error getting nonce: %v", err)
+	}
+	txOpts.Nonce = new(big.Int).SetUint64(nonce)
 	if err := n.addSignerToOpts(txOpts); err != nil {
 		return nil, fmt.Errorf("addSignerToOpts error: %w", err)
 	}
@@ -449,6 +456,13 @@ func (n *nodeClient) estimateRefundGas(ctx context.Context, secretHash [32]byte,
 func (n *nodeClient) redeem(ctx context.Context, redemptions []*asset.Redemption, maxFeeRate uint64, contractVer uint32) (tx *types.Transaction, err error) {
 	gas := dexeth.RedeemGas(len(redemptions), contractVer)
 	txOpts, _ := n.txOpts(ctx, 0, gas, dexeth.GweiToWei(maxFeeRate))
+	n.nonceSendMtx.Lock()
+	defer n.nonceSendMtx.Unlock()
+	nonce, err := n.leth.ApiBackend.GetPoolNonce(ctx, n.creds.addr)
+	if err != nil {
+		return nil, fmt.Errorf("error getting nonce: %v", err)
+	}
+	txOpts.Nonce = new(big.Int).SetUint64(nonce)
 	if err := n.addSignerToOpts(txOpts); err != nil {
 		return nil, fmt.Errorf("addSignerToOpts error: %w", err)
 	}
@@ -464,6 +478,13 @@ func (n *nodeClient) redeem(ctx context.Context, redemptions []*asset.Redemption
 func (n *nodeClient) refund(ctx context.Context, secretHash [32]byte, maxFeeRate uint64, contractVer uint32) (tx *types.Transaction, err error) {
 	gas := dexeth.RefundGas(contractVer)
 	txOpts, _ := n.txOpts(ctx, 0, gas, dexeth.GweiToWei(maxFeeRate))
+	n.nonceSendMtx.Lock()
+	defer n.nonceSendMtx.Unlock()
+	nonce, err := n.leth.ApiBackend.GetPoolNonce(ctx, n.creds.addr)
+	if err != nil {
+		return nil, fmt.Errorf("error getting nonce: %v", err)
+	}
+	txOpts.Nonce = new(big.Int).SetUint64(nonce)
 	if err := n.addSignerToOpts(txOpts); err != nil {
 		return nil, fmt.Errorf("addSignerToOpts error: %w", err)
 	}
@@ -512,6 +533,11 @@ func (n *nodeClient) getCodeAt(ctx context.Context, contractAddr common.Address)
 // txOpts generates a set of TransactOpts for the account. If maxFeeRate is
 // zero, it will be calculated as double the current baseFee. The tip will be
 // added automatically.
+//
+// NOTE: The v0 contract will reuse account nonces if the tx is not yet
+// confirmed. To avoid that be sure to get the next nonce from the light eth
+// node pool api while holding the nodeClient nonceSendMtx and set manually.
+// Hold the mutex until the tx has been sent or errors on sending.
 func (n *nodeClient) txOpts(ctx context.Context, val, maxGas uint64, maxFeeRate *big.Int) (*bind.TransactOpts, error) {
 	baseFee, gasTipCap, err := n.netFeeState(ctx)
 	if maxFeeRate == nil {
@@ -632,6 +658,13 @@ func (n *nodeClient) initiateToken(ctx context.Context, initiations []ethv0.ETHS
 	// TODO: reject if there is duplicate secret hash
 	// TODO: use estimated gas
 	txOpts, _ := n.txOpts(ctx, 0, 1e6, dexeth.GweiToWei(maxFeeRate))
+	n.nonceSendMtx.Lock()
+	defer n.nonceSendMtx.Unlock()
+	nonce, err := n.leth.ApiBackend.GetPoolNonce(ctx, n.creds.addr)
+	if err != nil {
+		return nil, fmt.Errorf("error getting nonce: %v", err)
+	}
+	txOpts.Nonce = new(big.Int).SetUint64(nonce)
 	if err := n.addSignerToOpts(txOpts); err != nil {
 		return nil, fmt.Errorf("addSignerToOpts error: %w", err)
 	}
@@ -645,6 +678,13 @@ func (n *nodeClient) redeemToken(ctx context.Context, redemptions []ethv0.ETHSwa
 	// TODO: reject if there is duplicate secret hash
 	// TODO: use estimated gas
 	txOpts, _ := n.txOpts(ctx, 0, 300000, dexeth.GweiToWei(maxFeeRate))
+	n.nonceSendMtx.Lock()
+	defer n.nonceSendMtx.Unlock()
+	nonce, err := n.leth.ApiBackend.GetPoolNonce(ctx, n.creds.addr)
+	if err != nil {
+		return nil, fmt.Errorf("error getting nonce: %v", err)
+	}
+	txOpts.Nonce = new(big.Int).SetUint64(nonce)
 	if err := n.addSignerToOpts(txOpts); err != nil {
 		return nil, fmt.Errorf("addSignerToOpts error: %w", err)
 	}
@@ -667,6 +707,13 @@ func (n *nodeClient) tokenIsRedeemable(ctx context.Context, secretHash, secret [
 func (n *nodeClient) refundToken(ctx context.Context, secretHash [32]byte, maxFeeRate uint64) (tx *types.Transaction, err error) {
 	// TODO: use estimated gas
 	txOpts, _ := n.txOpts(ctx, 0, 5e5, dexeth.GweiToWei(maxFeeRate))
+	n.nonceSendMtx.Lock()
+	defer n.nonceSendMtx.Unlock()
+	nonce, err := n.leth.ApiBackend.GetPoolNonce(ctx, n.creds.addr)
+	if err != nil {
+		return nil, fmt.Errorf("error getting nonce: %v", err)
+	}
+	txOpts.Nonce = new(big.Int).SetUint64(nonce)
 	if err := n.addSignerToOpts(txOpts); err != nil {
 		return nil, fmt.Errorf("addSignerToOpts error: %w", err)
 	}