108 lines
3.1 KiB
Rust
108 lines
3.1 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use std::cmp;
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use std::sync::Arc;
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use util::{U256, Address, H256, Hashable};
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use header::BlockNumber;
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use ethjson;
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/// Simple vector of hashes, should be at most 256 items large, can be smaller if being used
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/// for a block whose number is less than 257.
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pub type LastHashes = Vec<H256>;
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/// Information concerning the execution environment for a message-call/contract-creation.
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#[derive(Debug)]
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pub struct EnvInfo {
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/// The block number.
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pub number: BlockNumber,
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/// The block author.
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pub author: Address,
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/// The block timestamp.
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pub timestamp: u64,
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/// The block difficulty.
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pub difficulty: U256,
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/// The block gas limit.
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pub gas_limit: U256,
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/// The last 256 block hashes.
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pub last_hashes: Arc<LastHashes>,
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/// The gas used.
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pub gas_used: U256,
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}
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impl Default for EnvInfo {
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fn default() -> Self {
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EnvInfo {
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number: 0,
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author: Address::default(),
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timestamp: 0,
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difficulty: 0.into(),
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gas_limit: 0.into(),
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last_hashes: Arc::new(vec![]),
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gas_used: 0.into(),
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}
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}
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}
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impl From<ethjson::vm::Env> for EnvInfo {
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fn from(e: ethjson::vm::Env) -> Self {
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let number = e.number.into();
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EnvInfo {
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number: number,
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author: e.author.into(),
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difficulty: e.difficulty.into(),
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gas_limit: e.gas_limit.into(),
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timestamp: e.timestamp.into(),
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last_hashes: Arc::new((1..cmp::min(number + 1, 257)).map(|i| format!("{}", number - i).as_bytes().sha3()).collect()),
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gas_used: U256::default(),
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}
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}
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}
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#[cfg(test)]
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mod tests {
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extern crate rustc_serialize;
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use std::str::FromStr;
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use super::*;
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use util::{U256, Address};
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use ethjson;
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#[test]
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fn it_serializes_form_json() {
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let env_info = EnvInfo::from(ethjson::vm::Env {
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author: ethjson::hash::Address(Address::from_str("000000f00000000f000000000000f00000000f00").unwrap()),
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number: ethjson::uint::Uint(U256::from(1_112_339)),
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difficulty: ethjson::uint::Uint(U256::from(50_000)),
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gas_limit: ethjson::uint::Uint(U256::from(40_000)),
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timestamp: ethjson::uint::Uint(U256::from(1_100))
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});
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assert_eq!(env_info.number, 1112339);
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assert_eq!(env_info.author, Address::from_str("000000f00000000f000000000000f00000000f00").unwrap());
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assert_eq!(env_info.gas_limit, 40000.into());
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assert_eq!(env_info.difficulty, 50000.into());
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assert_eq!(env_info.gas_used, 0.into());
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}
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#[test]
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fn it_can_be_created_as_default() {
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let default_env_info = EnvInfo::default();
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assert_eq!(default_env_info.difficulty, 0.into());
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}
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}
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