openethereum/src/evm/ext.rs
2016-01-13 16:16:21 +01:00

63 lines
1.8 KiB
Rust

//! Interface for Evm externalities.
use util::hash::*;
use util::uint::*;
use util::bytes::*;
use evm::{Schedule, Error};
use env_info::*;
// TODO: replace all u64 with u256
pub trait Ext {
/// Returns a value for given key.
fn sload(&self, key: &H256) -> H256;
/// Stores a value for given key.
fn sstore(&mut self, key: H256, value: H256);
/// Returns address balance.
fn balance(&self, address: &Address) -> U256;
/// Returns the hash of one of the 256 most recent complete blocks.
fn blockhash(&self, number: &U256) -> H256;
/// Creates new contract.
///
/// If contract creation is successfull, return gas_left and contract address,
/// If depth is too big or transfer value exceeds balance, return None
/// Otherwise return appropriate `Error`.
fn create(&mut self, gas: u64, value: &U256, code: &[u8]) -> Result<(u64, Option<Address>), Error>;
/// Message call.
///
/// If call is successfull, returns gas left.
/// otherwise `Error`.
fn call(&mut self,
gas: u64,
call_gas: u64,
receive_address: &Address,
value: &U256,
data: &[u8],
code_address: &Address,
output: &mut [u8]) -> Result<u64, Error>;
/// Returns code at given address
fn extcode(&self, address: &Address) -> Vec<u8>;
/// Creates log entry with given topics and data
fn log(&mut self, topics: Vec<H256>, data: Bytes);
/// Should be called when transaction calls `RETURN` opcode.
/// Returns gas_left if cost of returning the data is not too high.
fn ret(&mut self, gas: u64, data: &[u8]) -> Result<u64, Error>;
/// Should be called when contract commits suicide.
/// Address to which funds should be refunded.
fn suicide(&mut self, refund_address: &Address);
/// Returns schedule.
fn schedule(&self) -> &Schedule;
/// Returns environment info.
fn env_info(&self) -> &EnvInfo;
}