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use core::marker::PhantomData;
use fp_evm::{Context, ExitRevert, Precompile, PrecompileFailure, PrecompileResult, PrecompileSet};
use frame_support::{
pallet_prelude::Weight, traits::FindAuthor, ConsensusEngineId, StorageHasher, Twox128,
};
use pallet_evm_precompile_blake2::Blake2F;
use pallet_evm_precompile_bn128::{Bn128Add, Bn128Mul, Bn128Pairing};
use pallet_evm_precompile_modexp::Modexp;
use pallet_evm_precompile_simple::{ECRecover, Identity, Ripemd160, Sha256};
use pallet_session::FindAccountFromAuthorIndex;
use sp_core::{crypto::ByteArray, H160, U256};
use crate::*;
use darwinia_ethereum::{
adapter::{CurrencyAdapter, KtonRemainBalance, RingRemainBalance},
EthereumBlockHashMapping,
};
use darwinia_evm::{
runner::stack::Runner, Config, EVMCurrencyAdapter, EnsureAddressTruncated, GasWeightMapping,
};
use darwinia_evm_precompile_dispatch::Dispatch;
use darwinia_evm_precompile_kton::{Erc20Metadata, KtonERC20};
use darwinia_evm_precompile_state_storage::{StateStorage, StorageFilterT};
use darwinia_support::evm::ConcatConverter;
pub struct EthereumFindAuthor<F>(PhantomData<F>);
impl<F: FindAuthor<u32>> FindAuthor<H160> for EthereumFindAuthor<F> {
fn find_author<'a, I>(digests: I) -> Option<H160>
where
I: 'a + IntoIterator<Item = (ConsensusEngineId, &'a [u8])>,
{
F::find_author(digests).map(|author_index| {
let authority_id = Babe::authorities()[author_index as usize].clone();
H160::from_slice(&authority_id.0.to_raw_vec()[4..24])
})
}
}
pub struct StorageFilter;
impl StorageFilterT for StorageFilter {
fn allow(prefix: &[u8]) -> bool {
prefix != Twox128::hash(b"EVM") && prefix != Twox128::hash(b"Ethereum")
}
}
#[derive(Default)]
pub struct PangolinPrecompiles<R>(PhantomData<R>);
impl<R> PangolinPrecompiles<R>
where
R: darwinia_ethereum::Config,
{
pub fn new() -> Self {
Self(Default::default())
}
pub fn used_addresses() -> [H160; 12] {
[
addr(1),
addr(2),
addr(3),
addr(4),
addr(5),
addr(6),
addr(7),
addr(8),
addr(9),
addr(1024),
addr(1025),
addr(1026),
]
}
}
pub struct KtonERC20MetaData;
impl Erc20Metadata for KtonERC20MetaData {
fn name() -> &'static str {
"PKTON ERC20"
}
fn symbol() -> &'static str {
"PKTON"
}
fn decimals() -> u8 {
18
}
}
impl<R> PrecompileSet for PangolinPrecompiles<R>
where
Dispatch<R>: Precompile,
KtonERC20<R, KtonERC20MetaData>: Precompile,
R: darwinia_ethereum::Config,
StateStorage<R, StorageFilter>: Precompile,
{
fn execute(
&self,
address: H160,
input: &[u8],
target_gas: Option<u64>,
context: &Context,
is_static: bool,
) -> Option<PrecompileResult> {
if self.is_precompile(address) && address > addr(9) && address != context.address {
return Some(Err(PrecompileFailure::Revert {
exit_status: ExitRevert::Reverted,
output: b"cannot be called with DELEGATECALL or CALLCODE".to_vec(),
cost: 0,
}));
};
match address {
a if a == addr(1) => Some(ECRecover::execute(input, target_gas, context, is_static)),
a if a == addr(2) => Some(Sha256::execute(input, target_gas, context, is_static)),
a if a == addr(3) => Some(Ripemd160::execute(input, target_gas, context, is_static)),
a if a == addr(4) => Some(Identity::execute(input, target_gas, context, is_static)),
a if a == addr(5) => Some(Modexp::execute(input, target_gas, context, is_static)),
a if a == addr(6) => Some(Bn128Add::execute(input, target_gas, context, is_static)),
a if a == addr(7) => Some(Bn128Mul::execute(input, target_gas, context, is_static)),
a if a == addr(8) => Some(Bn128Pairing::execute(input, target_gas, context, is_static)),
a if a == addr(9) => Some(Blake2F::execute(input, target_gas, context, is_static)),
a if a == addr(1024) => Some(<StateStorage<R, StorageFilter>>::execute(
input, target_gas, context, is_static,
)),
a if a == addr(1025) =>
Some(<Dispatch<R>>::execute(input, target_gas, context, is_static)),
a if a == addr(1026) => Some(<KtonERC20<R, KtonERC20MetaData>>::execute(
input, target_gas, context, is_static,
)),
_ => None,
}
}
fn is_precompile(&self, address: H160) -> bool {
Self::used_addresses().contains(&address)
}
}
pub struct FixedGasPrice;
impl FeeCalculator for FixedGasPrice {
fn min_gas_price() -> U256 {
U256::from(GWEI)
}
}
pub struct FixedGasWeightMapping;
impl GasWeightMapping for FixedGasWeightMapping {
fn gas_to_weight(gas: u64) -> Weight {
gas.saturating_mul(WEIGHT_PER_GAS)
}
fn weight_to_gas(weight: Weight) -> u64 {
weight.wrapping_div(WEIGHT_PER_GAS)
}
}
fn addr(a: u64) -> H160 {
H160::from_low_u64_be(a)
}
frame_support::parameter_types! {
pub const ChainId: u64 = 43;
pub BlockGasLimit: U256 = U256::from(NORMAL_DISPATCH_RATIO * MAXIMUM_BLOCK_WEIGHT / WEIGHT_PER_GAS);
pub PrecompilesValue: PangolinPrecompiles<Runtime> = PangolinPrecompiles::<_>::new();
}
impl Config for Runtime {
type BlockGasLimit = BlockGasLimit;
type BlockHashMapping = EthereumBlockHashMapping<Self>;
type CallOrigin = EnsureAddressTruncated<Self::AccountId>;
type ChainId = ChainId;
type Event = Event;
type FeeCalculator = FixedGasPrice;
type FindAuthor = EthereumFindAuthor<Babe>;
type GasWeightMapping = FixedGasWeightMapping;
type IntoAccountId = ConcatConverter<Self::AccountId>;
type KtonBalanceAdapter = CurrencyAdapter<Self, Kton, KtonRemainBalance>;
type OnChargeTransaction = EVMCurrencyAdapter<FindAccountFromAuthorIndex<Self, Babe>>;
type PrecompilesType = PangolinPrecompiles<Self>;
type PrecompilesValue = PrecompilesValue;
type RingBalanceAdapter = CurrencyAdapter<Self, Ring, RingRemainBalance>;
type Runner = Runner<Self>;
}
