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estimate_tx_commission.go
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estimate_tx_commission.go
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package service
import (
"context"
"encoding/hex"
"fmt"
"math/big"
"strings"
"github.com/MinterTeam/minter-go-node/core/code"
"github.com/MinterTeam/minter-go-node/core/transaction"
"github.com/MinterTeam/minter-go-node/formula"
pb "github.com/MinterTeam/node-grpc-gateway/api_pb"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// EstimateTxCommission return estimate of transaction.
func (s *Service) EstimateTxCommission(ctx context.Context, req *pb.EstimateTxCommissionRequest) (*pb.EstimateTxCommissionResponse, error) {
cState, err := s.blockchain.GetStateForHeight(req.Height)
if err != nil {
return nil, status.Error(codes.NotFound, err.Error())
}
cState.RLock()
defer cState.RUnlock()
if !strings.HasPrefix(strings.Title(req.GetTx()), "0x") {
return nil, status.Error(codes.InvalidArgument, "invalid transaction")
}
decodeString, err := hex.DecodeString(req.GetTx()[2:])
if err != nil {
return nil, status.Error(codes.InvalidArgument, err.Error())
}
decodedTx, err := transaction.TxDecoder.DecodeFromBytesWithoutSig(decodeString)
if err != nil {
return nil, status.Errorf(codes.InvalidArgument, "Cannot decode transaction: %s", err.Error())
}
commissionInBaseCoin := decodedTx.CommissionInBaseCoin()
commission := big.NewInt(0).Set(commissionInBaseCoin)
if !decodedTx.GasCoin.IsBaseCoin() {
coin := cState.Coins().GetCoin(decodedTx.GasCoin)
if coin.Reserve().Cmp(commissionInBaseCoin) < 0 {
return nil, s.createError(
status.New(codes.InvalidArgument, fmt.Sprintf("Coin reserve balance is not sufficient for transaction. Has: %s, required %s",
coin.Reserve().String(), commissionInBaseCoin.String())),
transaction.EncodeError(code.NewCoinReserveNotSufficient(
coin.GetFullSymbol(),
coin.ID().String(),
coin.Reserve().String(),
commissionInBaseCoin.String(),
)),
)
}
commission = formula.CalculateSaleAmount(coin.Volume(), coin.Reserve(), coin.Crr(), commissionInBaseCoin)
}
return &pb.EstimateTxCommissionResponse{
Commission: commission.String(),
}, nil
}