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estimate_tx_commission.go
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/
estimate_tx_commission.go
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package api
import (
"encoding/json"
"fmt"
"github.com/MinterTeam/minter-go-node/core/transaction"
"github.com/MinterTeam/minter-go-node/formula"
"github.com/MinterTeam/minter-go-node/hexutil"
"math/big"
"net/http"
)
func EstimateTxCommission(w http.ResponseWriter, r *http.Request) {
cState := GetStateForRequest(r)
query := r.URL.Query()
rawTx := query.Get("tx")
bytesTx, _ := hexutil.Decode("Mx" + rawTx)
tx, err := transaction.DecodeFromBytes(bytesTx)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(Response{
Code: 1,
Log: err.Error(),
})
return
}
commissionInBaseCoin := big.NewInt(0).Mul(tx.GasPrice, big.NewInt(tx.Gas()))
commissionInBaseCoin.Mul(commissionInBaseCoin, transaction.CommissionMultiplier)
commission := big.NewInt(0).Set(commissionInBaseCoin)
if !tx.GasCoin.IsBaseCoin() {
coin := cState.GetStateCoin(tx.GasCoin)
if coin.ReserveBalance().Cmp(commissionInBaseCoin) < 0 {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(Response{
Code: 1,
Log: fmt.Sprintf("Coin reserve balance is not sufficient for transaction. Has: %s, required %s", coin.ReserveBalance().String(), commissionInBaseCoin.String()),
})
return
}
commission = formula.CalculateSaleAmount(coin.Volume(), coin.ReserveBalance(), coin.Data().Crr, commissionInBaseCoin)
}
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(Response{
Code: 0,
Result: struct {
Commission string `json:"commission"`
}{
Commission: commission.String(),
},
})
}