94 lines
2.1 KiB
Rust
94 lines
2.1 KiB
Rust
use util::*;
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use header::BlockNumber;
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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: 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 EnvInfo {
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/// Create empty env_info initialized with zeros
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pub fn new() -> EnvInfo {
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EnvInfo::default()
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}
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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::new(),
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timestamp: 0,
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difficulty: x!(0),
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gas_limit: x!(0),
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last_hashes: vec![],
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gas_used: x!(0),
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}
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}
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}
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impl FromJson for EnvInfo {
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fn from_json(json: &Json) -> EnvInfo {
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let current_number: u64 = xjson!(&json["currentNumber"]);
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EnvInfo {
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number: current_number,
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author: xjson!(&json["currentCoinbase"]),
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difficulty: xjson!(&json["currentDifficulty"]),
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gas_limit: xjson!(&json["currentGasLimit"]),
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timestamp: xjson!(&json["currentTimestamp"]),
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last_hashes: (1..cmp::min(current_number + 1, 257)).map(|i| format!("{}", current_number - i).as_bytes().sha3()).collect(),
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gas_used: x!(0),
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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 super::*;
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use rustc_serialize::*;
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use util::from_json::FromJson;
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#[test]
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fn it_serializes_form_json() {
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let env_info = EnvInfo::from_json(&json::Json::from_str(
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r#"
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{
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"currentCoinbase": "0x0000000000000000000000000000000000000000",
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"currentNumber": 0,
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"currentDifficulty": 0,
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"currentGasLimit" : 0,
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"currentTimestamp" : 0
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}
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"#
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).unwrap());
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assert_eq!(env_info.number, 0);
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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, x!(0));
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}
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} |