63 lines
2.2 KiB
Rust
63 lines
2.2 KiB
Rust
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
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// This file is part of Parity Ethereum.
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// Parity Ethereum 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 Ethereum 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 Ethereum. If not, see <http://www.gnu.org/licenses/>.
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use std::sync::Arc;
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use ethereum_types::H256;
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use bytes::Bytes;
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use kvdb::{KeyValueDB, DBTransaction};
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use keccak_hasher::KeccakHasher;
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use hash_db::Hasher;
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use ethcore_db::COL_PRIVATE_TRANSACTIONS_STATE;
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use error::Error;
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/// Wrapper around local db with private state for sync purposes
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pub struct PrivateStateDB {
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db: Arc<dyn KeyValueDB>,
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}
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impl PrivateStateDB {
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/// Constructs the object
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pub fn new(db: Arc<dyn KeyValueDB>) -> Self {
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PrivateStateDB {
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db,
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}
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}
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/// Returns saved state for the hash
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pub fn state(&self, state_hash: &H256) -> Result<Bytes, Error> {
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trace!(target: "privatetx", "Retrieve private state from db with hash: {:?}", state_hash);
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self.db.get(COL_PRIVATE_TRANSACTIONS_STATE, state_hash.as_bytes())
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.expect("Low-level database error. Some issue with your hard disk?")
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.map(|s| s.to_vec())
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.ok_or(Error::PrivateStateNotFound)
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}
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/// Stores state for the hash
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pub fn save_state(&self, storage: &Bytes) -> Result<H256, Error> {
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let state_hash = self.state_hash(storage)?;
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let mut transaction = DBTransaction::new();
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transaction.put(COL_PRIVATE_TRANSACTIONS_STATE, state_hash.as_bytes(), storage);
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self.db.write(transaction).map_err(|_| Error::DatabaseWriteError)?;
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trace!(target: "privatetx", "Private state saved to db, its hash: {:?}", state_hash);
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Ok(state_hash)
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}
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/// Returns state's hash without committing it to DB
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pub fn state_hash(&self, state: &Bytes) -> Result<H256, Error> {
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Ok(KeccakHasher::hash(state))
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}
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}
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