use crate::{pallet_prelude::BlockNumberFor, Config, Pallet};
use codec::{Decode, Encode};
use scale_info::TypeInfo;
use sp_runtime::{
traits::{DispatchInfoOf, SignedExtension, Zero},
transaction_validity::TransactionValidityError,
};
#[derive(Encode, Decode, Clone, Eq, PartialEq, TypeInfo)]
#[scale_info(skip_type_params(T))]
pub struct CheckGenesis<T: Config + Send + Sync>(core::marker::PhantomData<T>);
impl<T: Config + Send + Sync> core::fmt::Debug for CheckGenesis<T> {
#[cfg(feature = "std")]
fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
write!(f, "CheckGenesis")
}
#[cfg(not(feature = "std"))]
fn fmt(&self, _: &mut core::fmt::Formatter) -> core::fmt::Result {
Ok(())
}
}
impl<T: Config + Send + Sync> CheckGenesis<T> {
pub fn new() -> Self {
Self(core::marker::PhantomData)
}
}
impl<T: Config + Send + Sync> SignedExtension for CheckGenesis<T> {
type AccountId = T::AccountId;
type Call = <T as Config>::RuntimeCall;
type AdditionalSigned = T::Hash;
type Pre = ();
const IDENTIFIER: &'static str = "CheckGenesis";
fn additional_signed(&self) -> Result<Self::AdditionalSigned, TransactionValidityError> {
Ok(<Pallet<T>>::block_hash(BlockNumberFor::<T>::zero()))
}
fn pre_dispatch(
self,
who: &Self::AccountId,
call: &Self::Call,
info: &DispatchInfoOf<Self::Call>,
len: usize,
) -> Result<Self::Pre, TransactionValidityError> {
self.validate(who, call, info, len).map(|_| ())
}
}