openethereum/util/src/trie/sectriedb.rs
2016-01-17 13:11:25 +01:00

60 lines
1.5 KiB
Rust

use hash::*;
use sha3::*;
use hashdb::*;
use rlp::*;
use super::triedb::*;
use super::trietraits::*;
/// A `Trie` implementation which hashes keys and uses a generic `HashDB` backing database.
///
/// Use it as a `Trie` trait object. You can use `raw()` to get the backing TrieDB object.
pub struct SecTrieDB<'db> {
raw: TrieDB<'db>
}
impl<'db> SecTrieDB<'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.
pub fn new(db: &'db HashDB, root: &'db H256) -> Self {
SecTrieDB { raw: TrieDB::new(db, root) }
}
/// Get a reference to the underlying raw TrieDB struct.
pub fn raw(&self) -> &TrieDB {
&self.raw
}
/// Get a mutable reference to the underlying raw TrieDB struct.
pub fn raw_mut(&mut self) -> &TrieDB {
&mut self.raw
}
}
impl<'db> Trie for SecTrieDB<'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())
}
}
#[test]
fn trie_to_sectrie() {
use memorydb::*;
use super::triedbmut::*;
let mut memdb = MemoryDB::new();
let mut root = H256::new();
{
let mut t = TrieDBMut::new(&mut memdb, &mut root);
t.insert(&(&[0x01u8, 0x23]).sha3(), &[0x01u8, 0x23]);
}
let t = SecTrieDB::new(&memdb, &root);
assert_eq!(t.get(&[0x01u8, 0x23]).unwrap(), &[0x01u8, 0x23]);
}