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params.go
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params.go
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package types
import (
"errors"
"fmt"
"strings"
yaml "gopkg.in/yaml.v2"
sdk "github.com/cosmos/cosmos-sdk/types"
paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
)
// Parameter store keys
var (
KeyMintDenom = []byte("MintDenom")
KeyBlocksPerYear = []byte("BlocksPerYear")
)
// ParamTable for minting module.
func ParamKeyTable() paramtypes.KeyTable {
return paramtypes.NewKeyTable().RegisterParamSet(&Params{})
}
func NewParams(
mintDenom string, blocksPerYear uint64,
) Params {
return Params{
MintDenom: mintDenom,
BlocksPerYear: blocksPerYear,
}
}
// default minting module parameters
func DefaultParams() Params {
return Params{
MintDenom: sdk.DefaultBondDenom,
BlocksPerYear: uint64(60 * 60 * 8766 / 5), // assuming 5 second block times
}
}
// validate params
func (p Params) Validate() error {
if err := validateMintDenom(p.MintDenom); err != nil {
return err
}
if err := validateBlocksPerYear(p.BlocksPerYear); err != nil {
return err
}
return nil
}
// String implements the Stringer interface.
func (p Params) String() string {
out, _ := yaml.Marshal(p)
return string(out)
}
// Implements params.ParamSet
func (p *Params) ParamSetPairs() paramtypes.ParamSetPairs {
return paramtypes.ParamSetPairs{
paramtypes.NewParamSetPair(KeyMintDenom, &p.MintDenom, validateMintDenom),
paramtypes.NewParamSetPair(KeyBlocksPerYear, &p.BlocksPerYear, validateBlocksPerYear),
}
}
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
}
func validateBlocksPerYear(i interface{}) error {
v, ok := i.(uint64)
if !ok {
return fmt.Errorf("invalid parameter type: %T", i)
}
if v == 0 {
return fmt.Errorf("blocks per year must be positive: %d", v)
}
return nil
}