openethereum/ethcore/src/log_entry.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/>.
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use util::*;
use basic_types::LogBloom;
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/// A record of execution for a `LOG` operation.
#[derive(Default, Debug, Clone, PartialEq, Eq)]
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pub struct LogEntry {
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/// The address of the contract executing at the point of the `LOG` operation.
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pub address: Address,
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/// The topics associated with the `LOG` operation.
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pub topics: Vec<H256>,
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/// The data associated with the `LOG` operation.
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pub data: Bytes,
}
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impl Encodable for LogEntry {
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fn rlp_append(&self, s: &mut RlpStream) {
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s.begin_list(3);
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s.append(&self.address);
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s.append(&self.topics);
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s.append(&self.data);
}
}
impl LogEntry {
/// Create a new log entry.
pub fn new(address: Address, topics: Vec<H256>, data: Bytes) -> LogEntry {
LogEntry {
address: address,
topics: topics,
data: data
}
}
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/// Calculates the bloom of this log entry.
pub fn bloom(&self) -> LogBloom {
self.topics.iter().fold(LogBloom::from_bloomed(&self.address.sha3()), |b, t| b.with_bloomed(&t.sha3()))
}
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}
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impl FromJson for LogEntry {
/// Convert given JSON object to a LogEntry.
fn from_json(json: &Json) -> LogEntry {
// TODO: check bloom.
LogEntry {
address: xjson!(&json["address"]),
topics: xjson!(&json["topics"]),
data: xjson!(&json["data"]),
}
}
}
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#[cfg(test)]
mod tests {
use util::*;
use super::LogEntry;
#[test]
fn test_empty_log_bloom() {
let bloom = H2048::from_str("00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
let address = Address::from_str("0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6").unwrap();
let log = LogEntry::new(address, vec![], vec![]);
assert_eq!(log.bloom(), bloom);
}
}