/
fee.go
115 lines (94 loc) · 2.96 KB
/
fee.go
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package keeper
import (
"math"
"strconv"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/oracleNetworkProtocol/plugchain/x/prc10/types"
)
const (
FeeBase = types.MinSymbolLen
FeeExp = 3
)
// DeductIssueTokenFee performs fee handling for issuing token
func (k Keeper) DeductIssueTokenFee(ctx sdk.Context, owner sdk.AccAddress, symbol string) error {
newFee, err := k.GetIssueTokenFee(ctx, symbol)
if err != nil {
return err
}
if err := k.bankKeeper.SendCoinsFromAccountToModule(ctx, owner, types.ModuleName, sdk.NewCoins(newFee)); err != nil {
return err
}
return k.bankKeeper.BurnCoins(ctx, types.ModuleName, sdk.NewCoins(newFee))
}
// DeductOperateTokenFee performs fee handling for operate token
func (k Keeper) DeductOperateTokenFee(ctx sdk.Context, owner sdk.AccAddress, symbol string) error {
newFee, err := k.GetOperateTokenFee(ctx, symbol)
if err != nil {
return err
}
if err := k.bankKeeper.SendCoinsFromAccountToModule(ctx, owner, types.ModuleName, sdk.NewCoins(newFee)); err != nil {
return err
}
return k.bankKeeper.BurnCoins(ctx, types.ModuleName, sdk.NewCoins(newFee))
}
//GetIssueTokenFee returns operate token fee
func (k Keeper) GetIssueTokenFee(ctx sdk.Context, symbol string) (sdk.Coin, error) {
var p types.Params
k.paramSpace.GetParamSet(ctx, &p)
ratioFee := ratioFeeFactor(symbol)
actualFee := sdk.NewDecFromInt(p.IssueTokenBaseFee.Amount).Quo(ratioFee)
var (
fee sdk.Coin
)
fee = sdk.NewCoin(p.IssueTokenBaseFee.Denom, sdk.OneInt())
if actualFee.GT(sdk.NewDec(1)) {
fee = sdk.NewCoin(p.IssueTokenBaseFee.Denom, actualFee.TruncateInt())
}
token, err := k.GetToken(ctx, fee.Denom)
if err != nil {
return sdk.Coin{}, err
}
newFee, er := token.ReturnMinUnitCoin(sdk.NewDecCoinFromCoin(fee))
if er != nil {
return sdk.Coin{}, er
}
return newFee, nil
}
//GetOperateTokenFee returns operate token fee
func (k Keeper) GetOperateTokenFee(ctx sdk.Context, symbol string) (sdk.Coin, error) {
var p types.Params
k.paramSpace.GetParamSet(ctx, &p)
ratioFee := ratioFeeFactor(symbol)
actualFee := sdk.NewDecFromInt(p.IssueTokenBaseFee.Amount).Quo(ratioFee).Mul(p.OperateTokenFeeRatio)
var (
fee sdk.Coin
)
fee = sdk.NewCoin(p.IssueTokenBaseFee.Denom, sdk.OneInt())
if actualFee.GT(sdk.NewDec(1)) {
fee = sdk.NewCoin(p.IssueTokenBaseFee.Denom, actualFee.TruncateInt())
}
token, err := k.GetToken(ctx, fee.Denom)
if err != nil {
return sdk.Coin{}, err
}
newFee, er := token.ReturnMinUnitCoin(sdk.NewDecCoinFromCoin(fee))
if er != nil {
return sdk.Coin{}, er
}
return newFee, nil
}
//ratioFeeFactor computes the fee factor of the given name
func ratioFeeFactor(symbol string) sdk.Dec {
sLen := len(symbol)
if sLen == 0 {
panic("the length of name must be greater than 0")
}
divi := math.Log(FeeBase)
divid := math.Log(float64(sLen))
busPower := math.Pow(divid/divi, FeeExp)
feeDec, err := sdk.NewDecFromStr(strconv.FormatFloat(busPower, 'f', 2, 64))
if err != nil {
panic("invalid string")
}
return feeDec
}