openethereum/ethcore/src/env_info.rs

112 lines
3.2 KiB
Rust
Raw Normal View History

2016-02-05 13:40:41 +01:00
// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity 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.
// Parity 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 Parity. If not, see <http://www.gnu.org/licenses/>.
use util::*;
use header::BlockNumber;
use ethjson;
/// 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)]
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: LastHashes,
/// The gas used.
pub gas_used: U256,
2016-06-23 11:30:48 +02:00
/// Block gas limit at DAO rescue block SOFT_FORK_BLOCK or None if not yet there.
pub dao_rescue_block_gas_limit: Option<U256>,
}
2016-01-20 17:57:53 +01:00
impl Default for EnvInfo {
fn default() -> Self {
EnvInfo {
2016-01-11 15:23:27 +01:00
number: 0,
author: Address::new(),
2016-01-11 15:23:27 +01:00
timestamp: 0,
2016-05-31 16:59:01 +02:00
difficulty: 0.into(),
gas_limit: 0.into(),
last_hashes: vec![],
2016-05-31 16:59:01 +02:00
gas_used: 0.into(),
dao_rescue_block_gas_limit: None,
}
}
2016-01-14 21:58:37 +01:00
}
impl From<ethjson::vm::Env> for EnvInfo {
fn from(e: ethjson::vm::Env) -> Self {
let number = e.number.into();
EnvInfo {
number: number,
author: e.author.into(),
difficulty: e.difficulty.into(),
gas_limit: e.gas_limit.into(),
timestamp: e.timestamp.into(),
last_hashes: (1..cmp::min(number + 1, 257)).map(|i| format!("{}", number - i).as_bytes().sha3()).collect(),
gas_used: U256::zero(),
dao_rescue_block_gas_limit: None,
}
}
}
2016-01-29 17:51:17 +01:00
#[cfg(test)]
mod tests {
extern crate rustc_serialize;
use super::*;
2016-02-01 12:35:13 +01:00
use util::hash::*;
use util::numbers::U256;
2016-02-01 12:35:13 +01:00
use std::str::FromStr;
use ethjson;
2016-01-29 17:51:17 +01:00
#[test]
fn it_serializes_form_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))
});
2016-01-29 17:51:17 +01:00
2016-02-01 12:35:13 +01:00
assert_eq!(env_info.number, 1112339);
assert_eq!(env_info.author, Address::from_str("000000f00000000f000000000000f00000000f00").unwrap());
2016-05-31 16:59:01 +02:00
assert_eq!(env_info.gas_limit, 40000.into());
assert_eq!(env_info.difficulty, 50000.into());
assert_eq!(env_info.gas_used, 0.into());
2016-01-29 17:51:17 +01:00
}
#[test]
fn it_can_be_created_as_default() {
let default_env_info = EnvInfo::default();
2016-05-31 16:59:01 +02:00
assert_eq!(default_env_info.difficulty, 0.into());
2016-01-29 17:51:17 +01:00
}
2016-02-02 23:06:34 +01:00
}