Add gas multiplier with default value 0.9

Author: artemskriabin

internal/config/network.go

@@ -44,6 +44,7 @@ type RelayerConfig struct {
 	WhiteList               whitelist
 	nonce                   uint64
 	GasLimitMultiplier      float64
+	GasPriceMultiplier      float64
 
 	mut *sync.Mutex
 }
@@ -61,8 +62,10 @@ func (e *ethereum) RelayerConfig() *RelayerConfig {
 			VaultMountPath          string            `fig:"vault_mount_path"`
 			WhiteList               []string          `fig:"whitelist"`
 			GasLimitMultiplier      float64           `fig:"gas_limit_multiplier"`
+			GasPriceMultiplier      float64           `fig:"gas_price_multiplier"`
 		}{
 			GasLimitMultiplier: 1.2,
+			GasPriceMultiplier: 0.9,
 		}
 		err := figure.
 			Out(&networkConfig).

internal/service/handlers/registration.go

@@ -113,11 +113,20 @@ func newTxResponse(tx *types.Transaction) resources.TxResponse {
 	}
 }
 
+var ONE = 1000000000
+
+func multiplyGasPrice(gasPrice *big.Int, multiplier float64) *big.Int {
+	mult := big.NewFloat(0).Mul(big.NewFloat(multiplier), big.NewFloat(float64(ONE)))
+	gas, _ := big.NewFloat(0).Mul(big.NewFloat(0).SetInt(gasPrice), mult).Int(nil)
+	return big.NewInt(0).Div(gas, big.NewInt(int64(ONE)))
+}
+
 func confGas(r *http.Request, txd *txData, receiver *common.Address) (err error) {
 	txd.gasPrice, err = RelayerConfig(r).RPC.SuggestGasPrice(r.Context())
 	if err != nil {
 		return fmt.Errorf("failed to suggest gas price: %w", err)
 	}
+	txd.gasPrice = multiplyGasPrice(txd.gasPrice, RelayerConfig(r).GasPriceMultiplier)
 
 	txd.gas, err = RelayerConfig(r).RPC.EstimateGas(r.Context(), ethereum.CallMsg{
 		From:     crypto.PubkeyToAddress(RelayerConfig(r).PrivateKey.PublicKey),