/
params.go
162 lines (134 loc) · 3.65 KB
/
params.go
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package types
import (
"fmt"
sdk "github.com/cosmos/cosmos-sdk/types"
paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
)
// Parameter keys and default values
var (
KeyAllowedPools = []byte("AllowedPools")
KeySwapFee = []byte("SwapFee")
DefaultAllowedPools = AllowedPools{}
DefaultSwapFee = sdk.ZeroDec()
MaxSwapFee = sdk.OneDec()
)
// NewParams returns a new params object
func NewParams(pairs AllowedPools, swapFee sdk.Dec) Params {
return Params{
AllowedPools: pairs,
SwapFee: swapFee,
}
}
// DefaultParams returns default params for swap module
func DefaultParams() Params {
return NewParams(
DefaultAllowedPools,
DefaultSwapFee,
)
}
// String implements fmt.Stringer
func (p Params) String() string {
return fmt.Sprintf(`Params:
AllowedPools: %s
SwapFee: %s`,
p.AllowedPools, p.SwapFee)
}
// ParamKeyTable for swap module.
func ParamKeyTable() paramtypes.KeyTable {
return paramtypes.NewKeyTable().RegisterParamSet(&Params{})
}
// ParamSetPairs implements params.ParamSet
func (p *Params) ParamSetPairs() paramtypes.ParamSetPairs {
return paramtypes.ParamSetPairs{
paramtypes.NewParamSetPair(KeyAllowedPools, &p.AllowedPools, validateAllowedPoolsParams),
paramtypes.NewParamSetPair(KeySwapFee, &p.SwapFee, validateSwapFee),
}
}
// Validate checks that the parameters have valid values.
func (p Params) Validate() error {
if err := validateAllowedPoolsParams(p.AllowedPools); err != nil {
return err
}
return validateSwapFee(p.SwapFee)
}
func validateAllowedPoolsParams(i interface{}) error {
p, ok := i.(AllowedPools)
if !ok {
return fmt.Errorf("invalid parameter type: %T", i)
}
return p.Validate()
}
func validateSwapFee(i interface{}) error {
swapFee, ok := i.(sdk.Dec)
if !ok {
return fmt.Errorf("invalid parameter type: %T", i)
}
if swapFee.IsNil() || swapFee.IsNegative() || swapFee.GTE(MaxSwapFee) {
return fmt.Errorf(fmt.Sprintf("invalid swap fee: %s", swapFee))
}
return nil
}
// NewAllowedPool returns a new AllowedPool object
func NewAllowedPool(tokenA, tokenB string) AllowedPool {
return AllowedPool{
TokenA: tokenA,
TokenB: tokenB,
}
}
// Validate validates allowedPool attributes and returns an error if invalid
func (p AllowedPool) Validate() error {
err := sdk.ValidateDenom(p.TokenA)
if err != nil {
return err
}
err = sdk.ValidateDenom(p.TokenB)
if err != nil {
return err
}
if p.TokenA == p.TokenB {
return fmt.Errorf(
"pool cannot have two tokens of the same type, received '%s' and '%s'",
p.TokenA, p.TokenB,
)
}
if p.TokenA > p.TokenB {
return fmt.Errorf(
"invalid token order: '%s' must come before '%s'",
p.TokenB, p.TokenA,
)
}
return nil
}
// Name returns the name for the allowed pool
func (p AllowedPool) Name() string {
return PoolID(p.TokenA, p.TokenB)
}
// String pretty prints the allowedPool
func (p AllowedPool) String() string {
return fmt.Sprintf(`AllowedPool:
Name: %s
Token A: %s
Token B: %s
`, p.Name(), p.TokenA, p.TokenB)
}
// AllowedPools is a slice of AllowedPool
type AllowedPools []AllowedPool
// NewAllowedPools returns AllowedPools from the provided values
func NewAllowedPools(allowedPools ...AllowedPool) AllowedPools {
return AllowedPools(allowedPools)
}
// Validate validates each allowedPool and returns an error if there are any duplicates
func (p AllowedPools) Validate() error {
seenAllowedPools := make(map[string]bool)
for _, allowedPool := range p {
err := allowedPool.Validate()
if err != nil {
return err
}
if seen := seenAllowedPools[allowedPool.Name()]; seen {
return fmt.Errorf("duplicate pool: %s", allowedPool.Name())
}
seenAllowedPools[allowedPool.Name()] = true
}
return nil
}