422 lines
12 KiB
Rust
422 lines
12 KiB
Rust
use common::*;
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use engine::Engine;
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use executive::Executive;
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pub type ApplyResult = Result<Receipt, Error>;
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/// Representation of the entire state of all accounts in the system.
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#[derive(Clone)]
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pub struct State {
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db: OverlayDB,
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root: H256,
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cache: RefCell<HashMap<Address, Option<Account>>>,
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account_start_nonce: U256,
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}
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impl State {
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/// Creates new state with empty state root
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pub fn new(mut db: OverlayDB, account_start_nonce: U256) -> State {
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let mut root = H256::new();
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{
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// init trie and reset root too null
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let _ = SecTrieDBMut::new(&mut db, &mut root);
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}
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State {
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db: db,
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root: root,
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cache: RefCell::new(HashMap::new()),
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account_start_nonce: account_start_nonce,
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}
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}
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/// Creates new state with existing state root
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pub fn from_existing(db: OverlayDB, root: H256, account_start_nonce: U256) -> State {
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{
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// trie should panic! if root does not exist
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let _ = SecTrieDB::new(&db, &root);
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}
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State {
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db: db,
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root: root,
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cache: RefCell::new(HashMap::new()),
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account_start_nonce: account_start_nonce,
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}
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}
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/// Create temporary state object
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pub fn new_temp() -> State {
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Self::new(OverlayDB::new_temp(), U256::from(0u8))
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}
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/// Destroy the current object and return root and database.
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pub fn drop(self) -> (H256, OverlayDB) {
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(self.root, self.db)
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}
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/// Return reference to root
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pub fn root(&self) -> &H256 {
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&self.root
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}
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/// Expose the underlying database; good to use for calling `state.db().commit()`.
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pub fn db(&mut self) -> &mut OverlayDB {
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&mut self.db
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}
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/// Create a new contract at address `contract`. If there is already an account at the address
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/// it will have its code reset, ready for `init_code()`.
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pub fn new_contract(&mut self, contract: &Address) {
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self.require_or_from(contract, false, || Account::new_contract(U256::from(0u8)), |r| r.reset_code());
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}
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/// Remove an existing account.
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pub fn kill_account(&mut self, account: &Address) {
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self.cache.borrow_mut().insert(account.clone(), None);
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}
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/// Determine whether an account exists.
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pub fn exists(&self, a: &Address) -> bool {
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self.cache.borrow().get(&a).unwrap_or(&None).is_some() || SecTrieDB::new(&self.db, &self.root).contains(&a)
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}
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/// Get the balance of account `a`.
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pub fn balance(&self, a: &Address) -> U256 {
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self.get(a, false).as_ref().map(|account| account.balance().clone()).unwrap_or(U256::from(0u8))
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}
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/// Get the nonce of account `a`.
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pub fn nonce(&self, a: &Address) -> U256 {
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self.get(a, false).as_ref().map(|account| account.nonce().clone()).unwrap_or(U256::from(0u8))
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}
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/// Mutate storage of account `a` so that it is `value` for `key`.
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pub fn storage_at(&self, a: &Address, key: &H256) -> H256 {
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self.get(a, false).as_ref().map(|a|a.storage_at(&self.db, key)).unwrap_or(H256::new())
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}
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/// Mutate storage of account `a` so that it is `value` for `key`.
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pub fn code(&self, a: &Address) -> Option<Vec<u8>> {
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self.get(a, true).as_ref().map(|a|a.code().map(|x|x.to_vec())).unwrap_or(None)
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}
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/// Add `incr` to the balance of account `a`.
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pub fn add_balance(&mut self, a: &Address, incr: &U256) {
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self.require(a, false).add_balance(incr)
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}
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/// Subtract `decr` from the balance of account `a`.
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pub fn sub_balance(&mut self, a: &Address, decr: &U256) {
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self.require(a, false).sub_balance(decr)
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}
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/// Subtracts `by` from the balance of `from` and adds it to that of `to`.
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pub fn transfer_balance(&mut self, from: &Address, to: &Address, by: &U256) {
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self.sub_balance(from, by);
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self.add_balance(to, by);
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}
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/// Increment the nonce of account `a` by 1.
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pub fn inc_nonce(&mut self, a: &Address) {
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self.require(a, false).inc_nonce()
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}
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/// Mutate storage of account `a` so that it is `value` for `key`.
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pub fn set_storage(&mut self, a: &Address, key: H256, value: H256) {
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self.require(a, false).set_storage(key, value);
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}
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/// Initialise the code of account `a` so that it is `value` for `key`.
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/// NOTE: Account should have been created with `new_contract`.
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pub fn init_code(&mut self, a: &Address, code: Bytes) {
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self.require_or_from(a, true, || Account::new_contract(U256::from(0u8)), |_|{}).init_code(code);
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}
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/// Execute a given transaction.
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/// This will change the state accordingly.
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pub fn apply(&mut self, env_info: &EnvInfo, engine: &Engine, t: &Transaction) -> ApplyResult {
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let e = try!(Executive::new(self, env_info, engine).transact(t));
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self.commit();
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Ok(Receipt::new(self.root().clone(), e.gas_used, e.logs))
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}
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/// Convert into a JSON representation.
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pub fn as_json(&self) -> String {
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unimplemented!();
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}
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/// Commit accounts to SecTrieDBMut. This is similar to cpp-ethereum's dev::eth::commit.
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/// `accounts` is mutable because we may need to commit the code or storage and record that.
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pub fn commit_into(db: &mut HashDB, mut root: H256, accounts: &mut HashMap<Address, Option<Account>>) -> H256 {
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// first, commit the sub trees.
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// TODO: is this necessary or can we dispense with the `ref mut a` for just `a`?
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for (_, ref mut a) in accounts.iter_mut() {
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match a {
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&mut&mut Some(ref mut account) => {
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account.commit_storage(db);
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account.commit_code(db);
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}
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&mut&mut None => {}
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}
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}
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{
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let mut trie = SecTrieDBMut::from_existing(db, &mut root);
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for (address, ref a) in accounts.iter() {
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match a {
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&&Some(ref account) => trie.insert(address, &account.rlp()),
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&&None => trie.remove(address),
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}
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}
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}
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root
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}
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/// Commits our cached account changes into the trie.
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pub fn commit(&mut self) {
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let r = self.root.clone(); // would prefer not to do this, really.
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self.root = Self::commit_into(&mut self.db, r, self.cache.borrow_mut().deref_mut());
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}
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/// Populate the state from `accounts`.
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pub fn populate_from(&mut self, accounts: PodState) {
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for (add, acc) in accounts.drain().into_iter() {
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self.cache.borrow_mut().insert(add, Some(Account::from_pod(acc)));
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}
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}
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/// Populate a PodAccount map from this state.
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pub fn to_hashmap_pod(&self) -> HashMap<Address, PodAccount> {
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// TODO: handle database rather than just the cache.
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self.cache.borrow().iter().fold(HashMap::new(), |mut m, (add, opt)| {
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if let &Some(ref acc) = opt {
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m.insert(add.clone(), PodAccount::from_account(acc));
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}
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m
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})
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}
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/// Populate a PodAccount map from this state.
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pub fn to_pod(&self) -> PodState {
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// TODO: handle database rather than just the cache.
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PodState::from(self.cache.borrow().iter().fold(BTreeMap::new(), |mut m, (add, opt)| {
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if let &Some(ref acc) = opt {
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m.insert(add.clone(), PodAccount::from_account(acc));
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}
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m
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}))
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}
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/// Pull account `a` in our cache from the trie DB and return it.
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/// `require_code` requires that the code be cached, too.
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fn get(&self, a: &Address, require_code: bool) -> Ref<Option<Account>> {
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self.cache.borrow_mut().entry(a.clone()).or_insert_with(||
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SecTrieDB::new(&self.db, &self.root).get(&a).map(|rlp| Account::from_rlp(rlp)));
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if require_code {
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if let Some(ref mut account) = self.cache.borrow_mut().get_mut(a).unwrap().as_mut() {
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account.cache_code(&self.db);
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}
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}
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Ref::map(self.cache.borrow(), |m| m.get(a).unwrap())
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}
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/// Pull account `a` in our cache from the trie DB. `require_code` requires that the code be cached, too.
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fn require(&self, a: &Address, require_code: bool) -> RefMut<Account> {
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self.require_or_from(a, require_code, || Account::new_basic(U256::from(0u8), self.account_start_nonce), |_|{})
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}
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/// Pull account `a` in our cache from the trie DB. `require_code` requires that the code be cached, too.
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/// If it doesn't exist, make account equal the evaluation of `default`.
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fn require_or_from<F: FnOnce() -> Account, G: FnOnce(&mut Account)>(&self, a: &Address, require_code: bool, default: F, not_default: G) -> RefMut<Account> {
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self.cache.borrow_mut().entry(a.clone()).or_insert_with(||
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SecTrieDB::new(&self.db, &self.root).get(&a).map(|rlp| Account::from_rlp(rlp)));
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let preexists = self.cache.borrow().get(a).unwrap().is_none();
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if preexists {
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self.cache.borrow_mut().insert(a.clone(), Some(default()));
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} else {
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not_default(self.cache.borrow_mut().get_mut(a).unwrap().as_mut().unwrap());
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}
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let b = self.cache.borrow_mut();
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RefMut::map(b, |m| m.get_mut(a).unwrap().as_mut().map(|account| {
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if require_code {
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account.cache_code(&self.db);
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}
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account
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}).unwrap())
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}
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}
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impl fmt::Debug for State {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{:?}", self.cache.borrow())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use util::hash::*;
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use util::trie::*;
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use util::rlp::*;
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use util::uint::*;
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use account::*;
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#[test]
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fn code_from_database() {
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let a = Address::zero();
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let (r, db) = {
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let mut s = State::new_temp();
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s.require_or_from(&a, false, ||Account::new_contract(U256::from(42u32)), |_|{});
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s.init_code(&a, vec![1, 2, 3]);
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assert_eq!(s.code(&a), Some([1u8, 2, 3].to_vec()));
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s.commit();
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assert_eq!(s.code(&a), Some([1u8, 2, 3].to_vec()));
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s.drop()
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};
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let s = State::from_existing(db, r, U256::from(0u8));
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assert_eq!(s.code(&a), Some([1u8, 2, 3].to_vec()));
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}
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#[test]
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fn storage_at_from_database() {
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let a = Address::zero();
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let (r, db) = {
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let mut s = State::new_temp();
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s.set_storage(&a, H256::from(&U256::from(01u64)), H256::from(&U256::from(69u64)));
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s.commit();
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s.drop()
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};
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let s = State::from_existing(db, r, U256::from(0u8));
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assert_eq!(s.storage_at(&a, &H256::from(&U256::from(01u64))), H256::from(&U256::from(69u64)));
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}
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#[test]
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fn get_from_database() {
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let a = Address::zero();
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let (r, db) = {
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let mut s = State::new_temp();
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s.inc_nonce(&a);
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s.add_balance(&a, &U256::from(69u64));
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s.commit();
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assert_eq!(s.balance(&a), U256::from(69u64));
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s.drop()
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};
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let s = State::from_existing(db, r, U256::from(0u8));
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assert_eq!(s.balance(&a), U256::from(69u64));
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assert_eq!(s.nonce(&a), U256::from(1u64));
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}
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#[test]
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fn remove() {
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let a = Address::zero();
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let mut s = State::new_temp();
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assert_eq!(s.exists(&a), false);
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s.inc_nonce(&a);
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assert_eq!(s.exists(&a), true);
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assert_eq!(s.nonce(&a), U256::from(1u64));
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s.kill_account(&a);
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assert_eq!(s.exists(&a), false);
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assert_eq!(s.nonce(&a), U256::from(0u64));
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}
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#[test]
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fn remove_from_database() {
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let a = Address::zero();
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let (r, db) = {
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let mut s = State::new_temp();
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s.inc_nonce(&a);
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s.commit();
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assert_eq!(s.exists(&a), true);
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assert_eq!(s.nonce(&a), U256::from(1u64));
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s.drop()
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};
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let (r, db) = {
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let mut s = State::from_existing(db, r, U256::from(0u8));
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assert_eq!(s.exists(&a), true);
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assert_eq!(s.nonce(&a), U256::from(1u64));
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s.kill_account(&a);
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s.commit();
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assert_eq!(s.exists(&a), false);
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assert_eq!(s.nonce(&a), U256::from(0u64));
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s.drop()
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};
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let s = State::from_existing(db, r, U256::from(0u8));
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assert_eq!(s.exists(&a), false);
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assert_eq!(s.nonce(&a), U256::from(0u64));
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}
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#[test]
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fn alter_balance() {
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let mut s = State::new_temp();
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let a = Address::zero();
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let b = address_from_u64(1u64);
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s.add_balance(&a, &U256::from(69u64));
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assert_eq!(s.balance(&a), U256::from(69u64));
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s.commit();
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assert_eq!(s.balance(&a), U256::from(69u64));
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s.sub_balance(&a, &U256::from(42u64));
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assert_eq!(s.balance(&a), U256::from(27u64));
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s.commit();
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assert_eq!(s.balance(&a), U256::from(27u64));
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s.transfer_balance(&a, &b, &U256::from(18u64));
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assert_eq!(s.balance(&a), U256::from(9u64));
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assert_eq!(s.balance(&b), U256::from(18u64));
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s.commit();
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assert_eq!(s.balance(&a), U256::from(9u64));
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assert_eq!(s.balance(&b), U256::from(18u64));
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}
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#[test]
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fn alter_nonce() {
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let mut s = State::new_temp();
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let a = Address::zero();
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s.inc_nonce(&a);
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assert_eq!(s.nonce(&a), U256::from(1u64));
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s.inc_nonce(&a);
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assert_eq!(s.nonce(&a), U256::from(2u64));
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s.commit();
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assert_eq!(s.nonce(&a), U256::from(2u64));
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s.inc_nonce(&a);
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assert_eq!(s.nonce(&a), U256::from(3u64));
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s.commit();
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assert_eq!(s.nonce(&a), U256::from(3u64));
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}
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#[test]
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fn balance_nonce() {
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let mut s = State::new_temp();
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let a = Address::zero();
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assert_eq!(s.balance(&a), U256::from(0u64));
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assert_eq!(s.nonce(&a), U256::from(0u64));
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s.commit();
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assert_eq!(s.balance(&a), U256::from(0u64));
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assert_eq!(s.nonce(&a), U256::from(0u64));
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}
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#[test]
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fn ensure_cached() {
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let mut s = State::new_temp();
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let a = Address::zero();
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s.require(&a, false);
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s.commit();
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assert_eq!(s.root().hex(), "0ce23f3c809de377b008a4a3ee94a0834aac8bec1f86e28ffe4fdb5a15b0c785");
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}
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#[test]
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fn create_empty() {
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let mut s = State::new_temp();
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s.commit();
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assert_eq!(s.root().hex(), "56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421");
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}
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}
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