2022-08-24 01:33:48 +00:00
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use std::str::FromStr;
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use bytes::Bytes;
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use eyre::Result;
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use ethers::prelude::{U256, H256, H160, Address};
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use revm::{Database, Bytecode, AccountInfo, EVM, Env, TransactTo, TransactOut};
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use futures::executor::block_on;
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use crate::consensus::types::ExecutionPayload;
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use super::ExecutionClient;
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pub struct Evm {
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evm: EVM<ProofDB>
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}
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impl Evm {
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pub fn new(execution: ExecutionClient, payload: ExecutionPayload) -> Self {
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let mut evm: EVM<ProofDB> = EVM::new();
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let db = ProofDB::new(execution, payload);
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evm.database(db);
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Evm { evm }
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}
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pub fn call(&mut self, to: &Address, calldata: &Vec<u8>, value: U256) -> Result<Vec<u8>> {
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let mut env = Env::default();
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let mut tx = revm::TxEnv::default();
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tx.transact_to = TransactTo::Call(*to);
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tx.data = Bytes::from(calldata.clone());
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tx.value = value;
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env.tx = tx;
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self.evm.env = env;
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let output = self.evm.transact().1;
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if let Some(err) = &self.evm.db.as_ref().unwrap().error {
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return Err(eyre::eyre!(err.clone()));
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}
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match output {
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TransactOut::None => Err(eyre::eyre!("Invalid Call")),
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TransactOut::Create(..) => Err(eyre::eyre!("Invalid Call")),
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TransactOut::Call(bytes) => Ok(bytes.to_vec()),
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}
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}
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}
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struct ProofDB {
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execution: ExecutionClient,
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payload: ExecutionPayload,
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error: Option<String>,
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}
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impl ProofDB {
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pub fn new(execution: ExecutionClient, payload: ExecutionPayload) -> Self {
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ProofDB {
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execution,
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payload,
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error: None,
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}
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}
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2022-08-24 16:28:43 +00:00
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pub fn safe_unwrap<T: Default>(&mut self, res: Result<T>) -> T {
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match res {
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Ok(value) => value,
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Err(err) => {
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self.error = Some(err.to_string());
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T::default()
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},
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}
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}
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2022-08-24 01:33:48 +00:00
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}
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impl Database for ProofDB {
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fn basic(&mut self, address: H160) -> AccountInfo {
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if is_precompile(&address) {
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return AccountInfo::default()
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}
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let account_future = self.execution.get_account(&address, None, &self.payload);
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2022-08-24 16:28:43 +00:00
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let account = self.safe_unwrap(block_on(account_future));
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2022-08-24 01:33:48 +00:00
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let bytecode_future = self.execution.get_code(&address, &self.payload);
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2022-08-24 16:28:43 +00:00
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let bytecode = self.safe_unwrap(block_on(bytecode_future));
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2022-08-24 01:33:48 +00:00
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let bytecode = Bytecode::new_raw(Bytes::from(bytecode));
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AccountInfo::new(account.balance, account.nonce.as_u64(), bytecode)
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}
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fn block_hash(&mut self, _number: U256) -> H256 {
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H256::default()
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}
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fn storage(&mut self, address: H160, slot: U256) -> U256 {
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let slots = [slot];
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let account_future = self.execution.get_account(&address, Some(&slots), &self.payload);
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2022-08-24 16:28:43 +00:00
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let account = self.safe_unwrap(block_on(account_future));
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2022-08-24 01:33:48 +00:00
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*account.slots.get(&slot).unwrap()
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}
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fn code_by_hash(&mut self, _code_hash: H256) -> Bytecode {
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panic!("should never be called");
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}
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}
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fn is_precompile(address: &Address) -> bool {
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address.le(&Address::from_str("0x0000000000000000000000000000000000000009").unwrap())
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}
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