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params.go
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params.go
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package types
import (
"fmt"
sdk "github.com/evoblockchain/evochain/libs/cosmos-sdk/types"
"github.com/evoblockchain/evochain/x/params"
)
// FeeRate defines swap fee rate
var (
defaultFeeRate = sdk.NewDecWithPrec(3, 3)
)
// Default parameter namespace
const (
DefaultParamspace = ModuleName
GenerateTokenType = 2
)
// Parameter store keys
var (
KeyFeeRate = []byte("FeeRate")
)
// ParamKeyTable for swap module
func ParamKeyTable() params.KeyTable {
return params.NewKeyTable().RegisterParamSet(&Params{})
}
// Params - used for initializing default parameter for swap at genesis
type Params struct {
FeeRate sdk.Dec `json:"fee_rate"`
}
// NewParams creates a new Params object
func NewParams(feeRate sdk.Dec) Params {
return Params{
FeeRate: feeRate,
}
}
// String implements the stringer interface for Params
func (p Params) String() string {
return fmt.Sprintf(`Poolswap Params:
TradeFeeRate: %s`, p.FeeRate)
}
func validateParams(value interface{}) error {
v, ok := value.(sdk.Dec)
if !ok {
return fmt.Errorf("invalid parameter type: %T", value)
}
if v.IsNegative() {
return fmt.Errorf("fee rate cannot be negative: %s", v)
}
if v.GT(sdk.OneDec()) {
return fmt.Errorf("fee rate too large: %s", v)
}
return nil
}
// ParamSetPairs implements params.ParamSet
func (p *Params) ParamSetPairs() params.ParamSetPairs {
return params.ParamSetPairs{
{Key: KeyFeeRate, Value: &p.FeeRate, ValidatorFn: validateParams},
}
}
// DefaultParams defines the parameters for this module
func DefaultParams() Params {
return NewParams(defaultFeeRate)
}