84 lines
2.6 KiB
Rust
84 lines
2.6 KiB
Rust
// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use hash::H256;
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use sha3::Hashable;
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use hashdb::{HashDB, DBValue};
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use super::triedb::TrieDB;
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use super::{Trie, TrieItem, Recorder};
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/// A `Trie` implementation which hashes keys and uses a generic `HashDB` backing database.
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///
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/// Use it as a `Trie` trait object. You can use `raw()` to get the backing `TrieDB` object.
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pub struct SecTrieDB<'db> {
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raw: TrieDB<'db>
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}
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impl<'db> SecTrieDB<'db> {
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/// Create a new trie with the backing database `db` and empty `root`
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///
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/// Initialise to the state entailed by the genesis block.
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/// This guarantees the trie is built correctly.
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/// Returns an error if root does not exist.
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pub fn new(db: &'db HashDB, root: &'db H256) -> super::Result<Self> {
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Ok(SecTrieDB { raw: try!(TrieDB::new(db, root)) })
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}
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/// Get a reference to the underlying raw `TrieDB` struct.
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pub fn raw(&self) -> &TrieDB {
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&self.raw
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}
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/// Get a mutable reference to the underlying raw `TrieDB` struct.
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pub fn raw_mut(&mut self) -> &mut TrieDB<'db> {
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&mut self.raw
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}
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}
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impl<'db> Trie for SecTrieDB<'db> {
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fn iter<'a>(&'a self) -> super::Result<Box<Iterator<Item = TrieItem> + 'a>> {
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TrieDB::iter(&self.raw)
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}
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fn root(&self) -> &H256 { self.raw.root() }
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fn contains(&self, key: &[u8]) -> super::Result<bool> {
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self.raw.contains(&key.sha3())
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}
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fn get_recorded<'a, 'b, R: 'b>(&'a self, key: &'b [u8], rec: &'b mut R) -> super::Result<Option<DBValue>>
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where 'a: 'b, R: Recorder
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{
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self.raw.get_recorded(&key.sha3(), rec)
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}
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}
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#[test]
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fn trie_to_sectrie() {
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use memorydb::MemoryDB;
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use super::triedbmut::TrieDBMut;
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use super::super::TrieMut;
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let mut memdb = MemoryDB::new();
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let mut root = H256::default();
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{
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let mut t = TrieDBMut::new(&mut memdb, &mut root);
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t.insert(&(&[0x01u8, 0x23]).sha3(), &[0x01u8, 0x23]).unwrap();
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}
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let t = SecTrieDB::new(&memdb, &root).unwrap();
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assert_eq!(t.get(&[0x01u8, 0x23]).unwrap().unwrap(), DBValue::from_slice(&[0x01u8, 0x23]));
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}
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