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params.go
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params.go
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package types
import (
"fmt"
"gopkg.in/yaml.v2"
sdk "github.com/cosmos/cosmos-sdk/types"
paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
)
// Parameter store keys
var (
KeyFee = []byte("Fee") // fee key
KeyPoolCreationFee = []byte("PoolCreationFee") // fee key
KeyTaxRate = []byte("TaxRate") // fee key
KeyStandardDenom = []byte("StandardDenom") // standard token denom key
)
// NewParams is the coinswap params constructor
func NewParams(fee, taxRate sdk.Dec, poolCreationFee sdk.Coin) Params {
return Params{
Fee: fee,
TaxRate: taxRate,
PoolCreationFee: poolCreationFee,
}
}
// ParamKeyTable returns the TypeTable for coinswap module
func ParamKeyTable() paramtypes.KeyTable {
return paramtypes.NewKeyTable().RegisterParamSet(&Params{})
}
// ParamSetPairs implements paramtypes.KeyValuePairs
func (p *Params) ParamSetPairs() paramtypes.ParamSetPairs {
return paramtypes.ParamSetPairs{
paramtypes.NewParamSetPair(KeyFee, &p.Fee, validateFee),
paramtypes.NewParamSetPair(KeyPoolCreationFee, &p.PoolCreationFee, validatePoolCreationFee),
paramtypes.NewParamSetPair(KeyTaxRate, &p.TaxRate, validateTaxRate),
}
}
// DefaultParams returns the default coinswap module parameters
func DefaultParams() Params {
fee := sdk.NewDecWithPrec(3, 3)
return Params{
Fee: fee,
PoolCreationFee: sdk.NewInt64Coin(sdk.DefaultBondDenom, 5000),
TaxRate: sdk.NewDecWithPrec(4, 1), // 0.4 (40%)
}
}
// String returns a human readable string representation of the parameters.
func (p Params) String() string {
out, _ := yaml.Marshal(p)
return string(out)
}
// Validate returns err if Params is invalid
func (p Params) Validate() error {
if !p.Fee.GT(sdk.ZeroDec()) || !p.Fee.LT(sdk.OneDec()) {
return fmt.Errorf("fee must be positive and less than 1: %s", p.Fee.String())
}
return nil
}
func validateFee(i interface{}) error {
v, ok := i.(sdk.Dec)
if !ok {
return fmt.Errorf("invalid parameter type: %T", i)
}
if !v.GT(sdk.ZeroDec()) || !v.LT(sdk.OneDec()) {
return fmt.Errorf("fee must be positive and less than 1: %s", v.String())
}
return nil
}
func validatePoolCreationFee(i interface{}) error {
v, ok := i.(sdk.Coin)
if !ok {
return fmt.Errorf("invalid parameter type: %T", i)
}
if !v.IsPositive() {
return fmt.Errorf("poolCreationFee must be positive: %s", v.String())
}
return nil
}
func validateTaxRate(i interface{}) error {
v, ok := i.(sdk.Dec)
if !ok {
return fmt.Errorf("invalid parameter type: %T", i)
}
if !v.GT(sdk.ZeroDec()) || !v.LT(sdk.OneDec()) {
return fmt.Errorf("fee must be positive and less than 1: %s", v.String())
}
return nil
}