openethereum/ethcore/src/env_info.rs

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// 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;
/// 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,
}
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impl Default for EnvInfo {
fn default() -> Self {
EnvInfo {
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number: 0,
author: Address::new(),
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timestamp: 0,
difficulty: x!(0),
gas_limit: x!(0),
last_hashes: vec![],
gas_used: x!(0),
}
}
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}
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impl FromJson for EnvInfo {
fn from_json(json: &Json) -> EnvInfo {
let current_number: u64 = xjson!(&json["currentNumber"]);
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EnvInfo {
number: current_number,
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author: xjson!(&json["currentCoinbase"]),
difficulty: xjson!(&json["currentDifficulty"]),
gas_limit: xjson!(&json["currentGasLimit"]),
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timestamp: xjson!(&json["currentTimestamp"]),
last_hashes: (1..cmp::min(current_number + 1, 257)).map(|i| format!("{}", current_number - i).as_bytes().sha3()).collect(),
gas_used: x!(0),
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}
}
}
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#[cfg(test)]
mod tests {
extern crate rustc_serialize;
use super::*;
use rustc_serialize::*;
use util::from_json::FromJson;
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use util::hash::*;
use std::str::FromStr;
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#[test]
fn it_serializes_form_json() {
let env_info = EnvInfo::from_json(&json::Json::from_str(
r#"
{
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"currentCoinbase": "0x000000f00000000f000000000000f00000000f00",
"currentNumber": 1112339,
"currentDifficulty": 50000,
"currentGasLimit" : 40000,
"currentTimestamp" : 1100
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}
"#
).unwrap());
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assert_eq!(env_info.number, 1112339);
assert_eq!(env_info.author, Address::from_str("000000f00000000f000000000000f00000000f00").unwrap());
assert_eq!(env_info.gas_limit, x!(40000));
assert_eq!(env_info.difficulty, x!(50000));
assert_eq!(env_info.gas_used, x!(0));
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}
#[test]
fn it_can_be_created_as_default() {
let default_env_info = EnvInfo::default();
assert_eq!(default_env_info.difficulty, x!(0));
}
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}