118 lines
3.6 KiB
Rust
118 lines
3.6 KiB
Rust
// Copyright 2015-2020 Parity Technologies (UK) Ltd.
|
|
// This file is part of OpenEthereum.
|
|
|
|
// OpenEthereum is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// OpenEthereum is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//! Environment information for transaction execution.
|
|
|
|
use ethereum_types::{Address, H256, U256};
|
|
use ethjson;
|
|
use hash::keccak;
|
|
use std::{cmp, sync::Arc};
|
|
|
|
type BlockNumber = u64;
|
|
|
|
/// Simple vector of hashes, should be at most 256 items large, can be smaller if being used
|
|
/// for a block whose number is less than 257.
|
|
pub type LastHashes = Vec<H256>;
|
|
|
|
/// Information concerning the execution environment for a message-call/contract-creation.
|
|
#[derive(Debug, Clone)]
|
|
pub struct EnvInfo {
|
|
/// The block number.
|
|
pub number: BlockNumber,
|
|
/// The block author.
|
|
pub author: Address,
|
|
/// The block timestamp.
|
|
pub timestamp: u64,
|
|
/// The block difficulty.
|
|
pub difficulty: U256,
|
|
/// The block gas limit.
|
|
pub gas_limit: U256,
|
|
/// The last 256 block hashes.
|
|
pub last_hashes: Arc<LastHashes>,
|
|
/// The gas used.
|
|
pub gas_used: U256,
|
|
}
|
|
|
|
impl Default for EnvInfo {
|
|
fn default() -> Self {
|
|
EnvInfo {
|
|
number: 0,
|
|
author: Address::default(),
|
|
timestamp: 0,
|
|
difficulty: 0.into(),
|
|
gas_limit: 0.into(),
|
|
last_hashes: Arc::new(vec![]),
|
|
gas_used: 0.into(),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<ethjson::vm::Env> for EnvInfo {
|
|
fn from(e: ethjson::vm::Env) -> Self {
|
|
let number = e.number.into();
|
|
EnvInfo {
|
|
number,
|
|
author: e.author.into(),
|
|
difficulty: e.difficulty.into(),
|
|
gas_limit: e.gas_limit.into(),
|
|
timestamp: e.timestamp.into(),
|
|
last_hashes: Arc::new(
|
|
(1..cmp::min(number + 1, 257))
|
|
.map(|i| keccak(format!("{}", number - i).as_bytes()))
|
|
.collect(),
|
|
),
|
|
gas_used: U256::default(),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use ethereum_types::{Address, U256};
|
|
use ethjson;
|
|
use std::str::FromStr;
|
|
|
|
#[test]
|
|
fn it_serializes_from_json() {
|
|
let env_info = EnvInfo::from(ethjson::vm::Env {
|
|
author: ethjson::hash::Address(
|
|
Address::from_str("000000f00000000f000000000000f00000000f00").unwrap(),
|
|
),
|
|
number: ethjson::uint::Uint(U256::from(1_112_339)),
|
|
difficulty: ethjson::uint::Uint(U256::from(50_000)),
|
|
gas_limit: ethjson::uint::Uint(U256::from(40_000)),
|
|
timestamp: ethjson::uint::Uint(U256::from(1_100)),
|
|
});
|
|
|
|
assert_eq!(env_info.number, 1112339);
|
|
assert_eq!(
|
|
env_info.author,
|
|
Address::from_str("000000f00000000f000000000000f00000000f00").unwrap()
|
|
);
|
|
assert_eq!(env_info.gas_limit, 40000.into());
|
|
assert_eq!(env_info.difficulty, 50000.into());
|
|
assert_eq!(env_info.gas_used, 0.into());
|
|
}
|
|
|
|
#[test]
|
|
fn it_can_be_created_as_default() {
|
|
let default_env_info = EnvInfo::default();
|
|
|
|
assert_eq!(default_env_info.difficulty, 0.into());
|
|
}
|
|
}
|