openethereum/src/evm/evm.rs

30 lines
831 B
Rust

//! Evm interface.
use common::*;
use evm::Ext;
/// Evm errors.
#[derive(Debug)]
pub enum Error {
/// `OutOfGas` is returned when transaction execution runs out of gas.
/// The state should be reverted to the state from before the
/// transaction execution. But it does not mean that transaction
/// was invalid. Balance still should be transfered and nonce
/// should be increased.
OutOfGas,
/// Returned on evm internal error. Should never be ignored during development.
/// Likely to cause consensus issues.
Internal,
}
/// Evm result.
///
/// Returns gas_left if execution is successfull, otherwise error.
pub type Result = result::Result<U256, Error>;
/// Evm interface.
pub trait Evm {
/// This function should be used to execute transaction.
fn exec(&self, params: &ActionParams, ext: &mut Ext) -> Result;
}