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use util::*;
use rlp::NULL_RLP;
static NULL_RLP_STATIC: [u8; 1] = [0x80; 1];
#[inline]
fn combine_key<'a>(address_hash: &'a H256, key: &'a H256) -> H256 {
let mut dst = key.clone();
{
let last_src: &[u8] = &*address_hash;
let last_dst: &mut [u8] = &mut *dst;
for (k, a) in last_dst[12..].iter_mut().zip(&last_src[12..]) {
*k ^= *a
}
}
dst
}
#[derive(Debug, Clone)]
pub enum Factory {
Mangled,
Plain,
}
impl Default for Factory {
fn default() -> Self { Factory::Mangled }
}
impl Factory {
pub fn readonly<'db>(&self, db: &'db HashDB, address_hash: H256) -> Box<HashDB + 'db> {
match *self {
Factory::Mangled => Box::new(AccountDB::from_hash(db, address_hash)),
Factory::Plain => Box::new(Wrapping(db)),
}
}
pub fn create<'db>(&self, db: &'db mut HashDB, address_hash: H256) -> Box<HashDB + 'db> {
match *self {
Factory::Mangled => Box::new(AccountDBMut::from_hash(db, address_hash)),
Factory::Plain => Box::new(WrappingMut(db)),
}
}
}
pub struct AccountDB<'db> {
db: &'db HashDB,
address_hash: H256,
}
impl<'db> AccountDB<'db> {
pub fn new(db: &'db HashDB, address: &Address) -> Self {
Self::from_hash(db, address.sha3())
}
pub fn from_hash(db: &'db HashDB, address_hash: H256) -> Self {
AccountDB {
db: db,
address_hash: address_hash,
}
}
}
impl<'db> HashDB for AccountDB<'db>{
fn keys(&self) -> HashMap<H256, i32> {
unimplemented!()
}
fn get(&self, key: &H256) -> Option<DBValue> {
if key == &SHA3_NULL_RLP {
return Some(DBValue::from_slice(&NULL_RLP_STATIC));
}
self.db.get(&combine_key(&self.address_hash, key))
}
fn contains(&self, key: &H256) -> bool {
if key == &SHA3_NULL_RLP {
return true;
}
self.db.contains(&combine_key(&self.address_hash, key))
}
fn insert(&mut self, _value: &[u8]) -> H256 {
unimplemented!()
}
fn emplace(&mut self, _key: H256, _value: DBValue) {
unimplemented!()
}
fn remove(&mut self, _key: &H256) {
unimplemented!()
}
}
pub struct AccountDBMut<'db> {
db: &'db mut HashDB,
address_hash: H256,
}
impl<'db> AccountDBMut<'db> {
pub fn new(db: &'db mut HashDB, address: &Address) -> Self {
Self::from_hash(db, address.sha3())
}
pub fn from_hash(db: &'db mut HashDB, address_hash: H256) -> Self {
AccountDBMut {
db: db,
address_hash: address_hash,
}
}
#[allow(dead_code)]
pub fn immutable(&'db self) -> AccountDB<'db> {
AccountDB { db: self.db, address_hash: self.address_hash.clone() }
}
}
impl<'db> HashDB for AccountDBMut<'db>{
fn keys(&self) -> HashMap<H256, i32> {
unimplemented!()
}
fn get(&self, key: &H256) -> Option<DBValue> {
if key == &SHA3_NULL_RLP {
return Some(DBValue::from_slice(&NULL_RLP_STATIC));
}
self.db.get(&combine_key(&self.address_hash, key))
}
fn contains(&self, key: &H256) -> bool {
if key == &SHA3_NULL_RLP {
return true;
}
self.db.contains(&combine_key(&self.address_hash, key))
}
fn insert(&mut self, value: &[u8]) -> H256 {
if value == &NULL_RLP {
return SHA3_NULL_RLP.clone();
}
let k = value.sha3();
let ak = combine_key(&self.address_hash, &k);
self.db.emplace(ak, DBValue::from_slice(value));
k
}
fn emplace(&mut self, key: H256, value: DBValue) {
if key == SHA3_NULL_RLP {
return;
}
let key = combine_key(&self.address_hash, &key);
self.db.emplace(key, value)
}
fn remove(&mut self, key: &H256) {
if key == &SHA3_NULL_RLP {
return;
}
let key = combine_key(&self.address_hash, key);
self.db.remove(&key)
}
}
struct Wrapping<'db>(&'db HashDB);
impl<'db> HashDB for Wrapping<'db> {
fn keys(&self) -> HashMap<H256, i32> {
unimplemented!()
}
fn get(&self, key: &H256) -> Option<DBValue> {
if key == &SHA3_NULL_RLP {
return Some(DBValue::from_slice(&NULL_RLP_STATIC));
}
self.0.get(key)
}
fn contains(&self, key: &H256) -> bool {
if key == &SHA3_NULL_RLP {
return true;
}
self.0.contains(key)
}
fn insert(&mut self, _value: &[u8]) -> H256 {
unimplemented!()
}
fn emplace(&mut self, _key: H256, _value: DBValue) {
unimplemented!()
}
fn remove(&mut self, _key: &H256) {
unimplemented!()
}
}
struct WrappingMut<'db>(&'db mut HashDB);
impl<'db> HashDB for WrappingMut<'db>{
fn keys(&self) -> HashMap<H256, i32> {
unimplemented!()
}
fn get(&self, key: &H256) -> Option<DBValue> {
if key == &SHA3_NULL_RLP {
return Some(DBValue::from_slice(&NULL_RLP_STATIC));
}
self.0.get(key)
}
fn contains(&self, key: &H256) -> bool {
if key == &SHA3_NULL_RLP {
return true;
}
self.0.contains(key)
}
fn insert(&mut self, value: &[u8]) -> H256 {
if value == &NULL_RLP {
return SHA3_NULL_RLP.clone();
}
self.0.insert(value)
}
fn emplace(&mut self, key: H256, value: DBValue) {
if key == SHA3_NULL_RLP {
return;
}
self.0.emplace(key, value)
}
fn remove(&mut self, key: &H256) {
if key == &SHA3_NULL_RLP {
return;
}
self.0.remove(key)
}
}