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params.go
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params.go
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package types
import (
"errors"
"fmt"
"strings"
"gopkg.in/yaml.v2"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
)
// default paramspace for params keeper
const (
DefaultParamSpace = "mint"
)
// Parameter store key
var (
// params store for inflation params
KeyInflation = []byte("Inflation")
KeyMintDenom = []byte("MintDenom")
)
// ParamTable for mint module
func ParamKeyTable() paramtypes.KeyTable {
return paramtypes.NewKeyTable().RegisterParamSet(&Params{})
}
func NewParams(mintDenom string, inflation sdk.Dec) Params {
return Params{
MintDenom: mintDenom,
Inflation: inflation,
}
}
// DefaultParams returns default minting module parameters
func DefaultParams() Params {
return Params{
Inflation: sdk.NewDecWithPrec(4, 2),
MintDenom: sdk.DefaultBondDenom,
}
}
// String implements the Stringer interface.
func (p Params) String() string {
out, _ := yaml.Marshal(p)
return string(out)
}
// ParamSetPairs implements params.ParamSet
func (p *Params) ParamSetPairs() paramtypes.ParamSetPairs {
return paramtypes.ParamSetPairs{
paramtypes.NewParamSetPair(KeyInflation, &p.Inflation, validateInflation),
paramtypes.NewParamSetPair(KeyMintDenom, &p.MintDenom, validateMintDenom),
}
}
// GetParamSpace implements params.ParamStruct
func (p *Params) GetParamSpace() string {
return DefaultParamSpace
}
// Validate returns err if the Params is invalid
func (p Params) Validate() error {
if p.Inflation.GT(sdk.NewDecWithPrec(2, 1)) || p.Inflation.LT(sdk.ZeroDec()) {
return sdkerrors.Wrapf(
ErrInvalidMintInflation,
"Mint inflation [%s] should be between [0, 0.2] ",
p.Inflation.String(),
)
}
if len(p.MintDenom) == 0 {
return sdkerrors.Wrapf(
ErrInvalidMintDenom,
"Mint denom [%s] should not be empty",
p.MintDenom,
)
}
return nil
}
func validateInflation(i interface{}) error {
v, ok := i.(sdk.Dec)
if !ok {
return fmt.Errorf("invalid parameter type: %T", i)
}
if v.GT(sdk.NewDecWithPrec(2, 1)) || v.LT(sdk.ZeroDec()) {
return fmt.Errorf("Mint inflation [%s] should be between [0, 0.2] ", v.String())
}
return nil
}
func validateMintDenom(i interface{}) error {
v, ok := i.(string)
if !ok {
return fmt.Errorf("invalid parameter type: %T", i)
}
if strings.TrimSpace(v) == "" {
return errors.New("mint denom cannot be blank")
}
if err := sdk.ValidateDenom(v); err != nil {
return err
}
return nil
}