101 lines
3.0 KiB
Rust
101 lines
3.0 KiB
Rust
// Copyright 2015-2018 Parity Technologies (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 hashdb::{HashDB, Hasher};
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use super::triedb::TrieDB;
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use super::{Result, DBValue, Trie, TrieItem, TrieIterator, Query};
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use node_codec::NodeCodec;
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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, H, C>
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where
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H: Hasher + 'db,
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C: NodeCodec<H>
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{
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raw: TrieDB<'db, H, C>
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}
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impl<'db, H, C> SecTrieDB<'db, H, C>
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where
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H: Hasher,
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C: NodeCodec<H>
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{
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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<H, DBValue>, root: &'db H::Out) -> Result<Self, H::Out, C::Error> {
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Ok(SecTrieDB { raw: 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<H, C> {
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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, H, C> {
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&mut self.raw
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}
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}
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impl<'db, H, C> Trie<H, C> for SecTrieDB<'db, H, C>
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where
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H: Hasher,
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C: NodeCodec<H>
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{
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fn root(&self) -> &H::Out { self.raw.root() }
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fn contains(&self, key: &[u8]) -> Result<bool, H::Out, C::Error> {
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self.raw.contains(H::hash(key).as_ref())
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}
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fn get_with<'a, 'key, Q: Query<H>>(&'a self, key: &'key [u8], query: Q) -> Result<Option<Q::Item>, H::Out, C::Error>
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where 'a: 'key
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{
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self.raw.get_with(H::hash(key).as_ref(), query)
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}
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fn iter<'a>(&'a self) -> Result<Box<TrieIterator<H, C, Item = TrieItem<H::Out, C::Error>> + 'a>, H::Out, C::Error> {
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TrieDB::iter(&self.raw)
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}
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}
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#[cfg(test)]
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mod test {
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use memorydb::MemoryDB;
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use keccak;
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use keccak_hasher::KeccakHasher;
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use ethtrie::{TrieDBMut, SecTrieDB, trie::{Trie, TrieMut}};
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use ethereum_types::H256;
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use DBValue;
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#[test]
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fn trie_to_sectrie() {
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let mut db = MemoryDB::<KeccakHasher, DBValue>::new();
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let mut root = H256::new();
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{
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let mut t = TrieDBMut::new(&mut db, &mut root);
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t.insert(&keccak::keccak(&[0x01u8, 0x23]), &[0x01u8, 0x23]).unwrap();
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}
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let t = SecTrieDB::new(&db, &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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}
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