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use bigint::hash::H256;
use keccak::keccak;
use hashdb::{HashDB, DBValue};
use super::{TrieDBMut, TrieMut};
pub struct FatDBMut<'db> {
raw: TrieDBMut<'db>,
}
impl<'db> FatDBMut<'db> {
pub fn new(db: &'db mut HashDB, root: &'db mut H256) -> Self {
FatDBMut { raw: TrieDBMut::new(db, root) }
}
pub fn from_existing(db: &'db mut HashDB, root: &'db mut H256) -> super::Result<Self> {
Ok(FatDBMut { raw: TrieDBMut::from_existing(db, root)? })
}
pub fn db(&self) -> &HashDB {
self.raw.db()
}
pub fn db_mut(&mut self) -> &mut HashDB {
self.raw.db_mut()
}
fn to_aux_key(key: &[u8]) -> H256 {
keccak(key)
}
}
impl<'db> TrieMut for FatDBMut<'db> {
fn root(&mut self) -> &H256 {
self.raw.root()
}
fn is_empty(&self) -> bool {
self.raw.is_empty()
}
fn contains(&self, key: &[u8]) -> super::Result<bool> {
self.raw.contains(&keccak(key))
}
fn get<'a, 'key>(&'a self, key: &'key [u8]) -> super::Result<Option<DBValue>>
where 'a: 'key
{
self.raw.get(&keccak(key))
}
fn insert(&mut self, key: &[u8], value: &[u8]) -> super::Result<Option<DBValue>> {
let hash = keccak(key);
let out = self.raw.insert(&hash, value)?;
let db = self.raw.db_mut();
if out.is_none() {
db.emplace(Self::to_aux_key(&hash), DBValue::from_slice(key));
}
Ok(out)
}
fn remove(&mut self, key: &[u8]) -> super::Result<Option<DBValue>> {
let hash = keccak(key);
let out = self.raw.remove(&hash)?;
if out.is_some() {
self.raw.db_mut().remove(&Self::to_aux_key(&hash));
}
Ok(out)
}
}
#[test]
fn fatdb_to_trie() {
use memorydb::MemoryDB;
use super::TrieDB;
use super::Trie;
let mut memdb = MemoryDB::new();
let mut root = H256::default();
{
let mut t = FatDBMut::new(&mut memdb, &mut root);
t.insert(&[0x01u8, 0x23], &[0x01u8, 0x23]).unwrap();
}
let t = TrieDB::new(&memdb, &root).unwrap();
assert_eq!(t.get(&keccak(&[0x01u8, 0x23])).unwrap().unwrap(), DBValue::from_slice(&[0x01u8, 0x23]));
}