openethereum/ethcore/src/env_info.rs

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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,
}
impl EnvInfo {
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/// Create empty env_info initialized with zeros
pub fn new() -> EnvInfo {
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EnvInfo::default()
}
}
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;
#[test]
fn it_serializes_form_json() {
let env_info = EnvInfo::from_json(&json::Json::from_str(
r#"
{
"currentCoinbase": "0x0000000000000000000000000000000000000000",
"currentNumber": 0,
"currentDifficulty": 0,
"currentGasLimit" : 0,
"currentTimestamp" : 0
}
"#
).unwrap());
assert_eq!(env_info.number, 0);
}
#[test]
fn it_can_be_created_as_default() {
let default_env_info = EnvInfo::default();
assert_eq!(default_env_info.difficulty, x!(0));
}
}