93 lines
2.2 KiB
Rust
93 lines
2.2 KiB
Rust
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use std::collections::HashMap;
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use util::hash::*;
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use util::hashdb::*;
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use util::overlaydb::*;
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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::Account;
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pub struct State {
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db: OverlayDB,
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root: H256,
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_cache: 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 _ = TrieDB::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: 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 new_existing(mut db: OverlayDB, mut 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 _ = TrieDB::new_existing(&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: 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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/// 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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/// Commit everything to the disk
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pub fn commit_db(&mut self) {
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self.db.commit().expect("Number of kills exceeded number of inserts!");
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}
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/// Commit accounts to TrieDB. This is simplified version of
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/// cpp-ethereum's dev::eth::commit.
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pub fn commit(db: &mut HashDB, mut root: H256, accounts: &mut HashMap<Address, Account>) -> H256 {
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// first, commit the sub trees.
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for (_, ref mut account) in accounts.iter_mut() {
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account.commit_storage(db);
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account.commit_code(db);
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}
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{
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let mut trie = TrieDB::new_existing(db, &mut root);
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for (address, account) in accounts.iter() {
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let mut stream = RlpStream::new_list(4);
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stream.append(account.nonce());
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stream.append(account.balance());
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stream.append(account.storage_root().unwrap());
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stream.append(account.code_hash().unwrap());
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trie.insert(address, &stream.out());
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}
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}
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root
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}
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pub fn insert_accounts(&mut self, accounts: &mut HashMap<Address, Account>) {
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let r = self.root.clone();
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self.root = Self::commit(&mut self.db, r, accounts);
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}
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}
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