helios/execution/src/evm.rs

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use std::{str::FromStr, thread};
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use bytes::Bytes;
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use ethers::prelude::{Address, H160, H256, U256};
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use eyre::Result;
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use revm::{AccountInfo, Bytecode, Database, Env, TransactOut, TransactTo, EVM};
use tokio::runtime::Runtime;
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use consensus::types::ExecutionPayload;
use crate::types::CallOpts;
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use super::ExecutionClient;
pub struct Evm {
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evm: EVM<ProofDB>,
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}
impl Evm {
pub fn new(execution: ExecutionClient, payload: ExecutionPayload) -> Self {
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let mut evm: EVM<ProofDB> = EVM::new();
let db = ProofDB::new(execution, payload);
evm.database(db);
Evm { evm }
}
pub fn call(&mut self, opts: &CallOpts) -> Result<Vec<u8>> {
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let mut env = Env::default();
env.tx.transact_to = TransactTo::Call(opts.to);
env.tx.caller = opts.from.unwrap_or(Address::zero());
env.tx.value = opts.value.unwrap_or(U256::from(0));
env.tx.data = Bytes::from(opts.data.clone().unwrap_or(vec![]));
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self.evm.env = env;
let output = self.evm.transact().1;
if let Some(err) = &self.evm.db.as_ref().unwrap().error {
return Err(eyre::eyre!(err.clone()));
}
match output {
TransactOut::None => Err(eyre::eyre!("Invalid Call")),
TransactOut::Create(..) => Err(eyre::eyre!("Invalid Call")),
TransactOut::Call(bytes) => Ok(bytes.to_vec()),
}
}
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pub fn estimate_gas(&mut self, opts: &CallOpts) -> Result<u64> {
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let mut env = Env::default();
env.tx.transact_to = TransactTo::Call(opts.to);
env.tx.caller = opts.from.unwrap_or(Address::zero());
env.tx.value = opts.value.unwrap_or(U256::from(0));
env.tx.data = Bytes::from(opts.data.clone().unwrap_or(vec![]));
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self.evm.env = env;
let gas = self.evm.transact().2;
if let Some(err) = &self.evm.db.as_ref().unwrap().error {
return Err(eyre::eyre!(err.clone()));
}
Ok(gas)
}
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}
struct ProofDB {
execution: ExecutionClient,
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payload: ExecutionPayload,
error: Option<String>,
}
impl ProofDB {
pub fn new(execution: ExecutionClient, payload: ExecutionPayload) -> Self {
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ProofDB {
execution,
payload,
error: None,
}
}
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pub fn safe_unwrap<T: Default>(&mut self, res: Result<T>) -> T {
match res {
Ok(value) => value,
Err(err) => {
self.error = Some(err.to_string());
T::default()
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}
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}
}
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}
impl Database for ProofDB {
fn basic(&mut self, address: H160) -> AccountInfo {
if is_precompile(&address) {
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return AccountInfo::default();
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}
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let execution = self.execution.clone();
let addr = address.clone();
let payload = self.payload.clone();
let handle = thread::spawn(move || {
let account_fut = execution.get_account(&addr, None, &payload);
let runtime = Runtime::new()?;
runtime.block_on(account_fut)
});
let account = self.safe_unwrap(handle.join().unwrap());
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let execution = self.execution.clone();
let addr = address.clone();
let payload = self.payload.clone();
let handle = thread::spawn(move || {
let code_fut = execution.get_code(&addr, &payload);
let runtime = Runtime::new()?;
runtime.block_on(code_fut)
});
let bytecode = self.safe_unwrap(handle.join().unwrap());
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let bytecode = Bytecode::new_raw(Bytes::from(bytecode));
AccountInfo::new(account.balance, account.nonce.as_u64(), bytecode)
}
fn block_hash(&mut self, _number: U256) -> H256 {
H256::default()
}
fn storage(&mut self, address: H160, slot: U256) -> U256 {
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let execution = self.execution.clone();
let addr = address.clone();
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let slots = [slot];
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let payload = self.payload.clone();
let handle = thread::spawn(move || {
let account_fut = execution.get_account(&addr, Some(&slots), &payload);
let runtime = Runtime::new()?;
runtime.block_on(account_fut)
});
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let account = self.safe_unwrap(handle.join().unwrap());
let value = account.slots.get(&slot);
match value {
Some(value) => *value,
None => {
self.error = Some("slot not found".to_string());
U256::default()
}
}
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}
fn code_by_hash(&mut self, _code_hash: H256) -> Bytecode {
panic!("should never be called");
}
}
fn is_precompile(address: &Address) -> bool {
address.le(&Address::from_str("0x0000000000000000000000000000000000000009").unwrap())
}