Trait pallet_evm::OnChargeEVMTransaction

pub trait OnChargeEVMTransaction<T: Config> {
    type LiquidityInfo: Default;
    fn withdraw_fee(
        who: &H160, 
        fee: U256
    ) -> Result<Self::LiquidityInfo, Error<T>>;
    fn correct_and_deposit_fee(
        who: &H160, 
        corrected_fee: U256, 
        already_withdrawn: Self::LiquidityInfo
    ) -> Result<(), Error<T>>;
}

Handle withdrawing, refunding and depositing of transaction fees. Similar to OnChargeTransaction of pallet_transaction_payment

Associated Types

type LiquidityInfo: Default

Required methods

fn withdraw_fee(who: &H160, fee: U256) -> Result<Self::LiquidityInfo, Error<T>>

Before the transaction is executed the payment of the transaction fees need to be secured.

fn correct_and_deposit_fee(
    who: &H160,
    corrected_fee: U256,
    already_withdrawn: Self::LiquidityInfo
) -> Result<(), Error<T>>

After the transaction was executed the actual fee can be calculated. This function should refund any overpaid fees and optionally deposit the corrected amount.

Implementations on Foreign Types

impl<T> OnChargeEVMTransaction<T> for () where
    T: Config,
    <T::Currency as Currency<<T as Config>::AccountId>>::PositiveImbalance: Imbalance<<T::Currency as Currency<<T as Config>::AccountId>>::Balance, Opposite = <T::Currency as Currency<<T as Config>::AccountId>>::NegativeImbalance>,
    <T::Currency as Currency<<T as Config>::AccountId>>::NegativeImbalance: Imbalance<<T::Currency as Currency<<T as Config>::AccountId>>::Balance, Opposite = <T::Currency as Currency<<T as Config>::AccountId>>::PositiveImbalance>, 

Implementation for () does not specify what to do with imbalance

type LiquidityInfo = Option<<T::Currency as Currency<<T as Config>::AccountId>>::NegativeImbalance>

fn withdraw_fee(who: &H160, fee: U256) -> Result<Self::LiquidityInfo, Error<T>>

fn correct_and_deposit_fee(
    who: &H160,
    corrected_fee: U256,
    already_withdrawn: Self::LiquidityInfo
) -> Result<(), Error<T>>

Implementors

impl<T, C, OU> OnChargeEVMTransaction<T> for EVMCurrencyAdapter<C, OU> where
    T: Config,
    C: Currency<<T as Config>::AccountId>,
    C::PositiveImbalance: Imbalance<<C as Currency<<T as Config>::AccountId>>::Balance, Opposite = C::NegativeImbalance>,
    C::NegativeImbalance: Imbalance<<C as Currency<<T as Config>::AccountId>>::Balance, Opposite = C::PositiveImbalance>,
    OU: OnUnbalanced<<C as Currency<<T as Config>::AccountId>>::NegativeImbalance>,