openethereum/util/src/trie/sectriedbmut.rs

88 lines
2.6 KiB
Rust
Raw Normal View History

2016-02-05 13:40:41 +01:00
// 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/>.
2016-01-06 13:59:48 +01:00
use hash::*;
use sha3::*;
use hashdb::*;
use rlp::*;
use super::triedbmut::*;
use super::trietraits::*;
/// A mutable `Trie` implementation which hashes keys and uses a generic `HashDB` backing database.
2016-04-06 10:07:24 +02:00
///
/// Use it as a `Trie` or `TrieMut` trait object. You can use `raw()` to get the backing `TrieDBMut` object.
2016-01-06 13:59:48 +01:00
pub struct SecTrieDBMut<'db> {
raw: TrieDBMut<'db>
}
impl<'db> SecTrieDBMut<'db> {
/// Create a new trie with the backing database `db` and empty `root`
/// Initialise to the state entailed by the genesis block.
/// This guarantees the trie is built correctly.
2016-04-06 10:07:24 +02:00
pub fn new(db: &'db mut HashDB, root: &'db mut H256) -> Self {
2016-01-06 13:59:48 +01:00
SecTrieDBMut { raw: TrieDBMut::new(db, root) }
}
/// Create a new trie with the backing database `db` and `root`
/// Panics, if `root` does not exist
2016-01-08 22:30:45 +01:00
pub fn from_existing(db: &'db mut HashDB, root: &'db mut H256) -> Self {
SecTrieDBMut { raw: TrieDBMut::from_existing(db, root) }
2016-01-06 13:59:48 +01:00
}
/// Get the backing database.
pub fn db(&'db self) -> &'db HashDB { self.raw.db() }
/// Get the backing database.
pub fn db_mut(&'db mut self) -> &'db mut HashDB { self.raw.db_mut() }
2016-01-06 13:59:48 +01:00
}
impl<'db> Trie for SecTrieDBMut<'db> {
fn root(&self) -> &H256 { self.raw.root() }
fn contains(&self, key: &[u8]) -> bool {
self.raw.contains(&key.sha3())
}
fn get<'a, 'key>(&'a self, key: &'key [u8]) -> Option<&'a [u8]> where 'a: 'key {
self.raw.get(&key.sha3())
}
}
impl<'db> TrieMut for SecTrieDBMut<'db> {
fn insert(&mut self, key: &[u8], value: &[u8]) {
self.raw.insert(&key.sha3(), value);
}
fn remove(&mut self, key: &[u8]) {
self.raw.remove(&key.sha3());
}
}
#[test]
fn sectrie_to_trie() {
use memorydb::*;
use super::triedb::*;
let mut memdb = MemoryDB::new();
let mut root = H256::new();
{
let mut t = SecTrieDBMut::new(&mut memdb, &mut root);
t.insert(&[0x01u8, 0x23], &[0x01u8, 0x23]);
}
let t = TrieDB::new(&memdb, &root);
assert_eq!(t.get(&(&[0x01u8, 0x23]).sha3()).unwrap(), &[0x01u8, 0x23]);
}