106 lines
4.0 KiB
Rust
106 lines
4.0 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
|
|
// This file is part of Parity.
|
|
|
|
// Parity is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// Parity is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//! Disk-backed `HashDB` implementation.
|
|
|
|
use std::io;
|
|
use std::sync::Arc;
|
|
|
|
use bytes::Bytes;
|
|
use ethereum_types::H256;
|
|
use hashdb::*;
|
|
use keccak_hasher::KeccakHasher;
|
|
use kvdb::{self, DBTransaction};
|
|
|
|
/// A `HashDB` which can manage a short-term journal potentially containing many forks of mutually
|
|
/// exclusive actions.
|
|
pub trait JournalDB: HashDB<KeccakHasher> {
|
|
/// Return a copy of ourself, in a box.
|
|
fn boxed_clone(&self) -> Box<JournalDB>;
|
|
|
|
/// Returns heap memory size used
|
|
fn mem_used(&self) -> usize;
|
|
|
|
/// Returns the size of journalled state in memory.
|
|
/// This function has a considerable speed requirement --
|
|
/// it must be fast enough to call several times per block imported.
|
|
fn journal_size(&self) -> usize { 0 }
|
|
|
|
/// Check if this database has any commits
|
|
fn is_empty(&self) -> bool;
|
|
|
|
/// Get the earliest era in the DB. None if there isn't yet any data in there.
|
|
fn earliest_era(&self) -> Option<u64> { None }
|
|
|
|
/// Get the latest era in the DB. None if there isn't yet any data in there.
|
|
fn latest_era(&self) -> Option<u64>;
|
|
|
|
/// Journal recent database operations as being associated with a given era and id.
|
|
// TODO: give the overlay to this function so journaldbs don't manage the overlays themeselves.
|
|
fn journal_under(&mut self, batch: &mut DBTransaction, now: u64, id: &H256) -> io::Result<u32>;
|
|
|
|
/// Mark a given block as canonical, indicating that competing blocks' states may be pruned out.
|
|
fn mark_canonical(&mut self, batch: &mut DBTransaction, era: u64, id: &H256) -> io::Result<u32>;
|
|
|
|
/// Commit all queued insert and delete operations without affecting any journalling -- this requires that all insertions
|
|
/// and deletions are indeed canonical and will likely lead to an invalid database if that assumption is violated.
|
|
///
|
|
/// Any keys or values inserted or deleted must be completely independent of those affected
|
|
/// by any previous `commit` operations. Essentially, this means that `inject` can be used
|
|
/// either to restore a state to a fresh database, or to insert data which may only be journalled
|
|
/// from this point onwards.
|
|
fn inject(&mut self, batch: &mut DBTransaction) -> io::Result<u32>;
|
|
|
|
/// State data query
|
|
fn state(&self, _id: &H256) -> Option<Bytes>;
|
|
|
|
/// Whether this database is pruned.
|
|
fn is_pruned(&self) -> bool { true }
|
|
|
|
/// Get backing database.
|
|
fn backing(&self) -> &Arc<kvdb::KeyValueDB>;
|
|
|
|
/// Clear internal strucutres. This should called after changes have been written
|
|
/// to the backing strage
|
|
fn flush(&self) {}
|
|
|
|
/// Consolidate all the insertions and deletions in the given memory overlay.
|
|
fn consolidate(&mut self, overlay: ::memorydb::MemoryDB<KeccakHasher>);
|
|
|
|
/// Commit all changes in a single batch
|
|
#[cfg(test)]
|
|
fn commit_batch(&mut self, now: u64, id: &H256, end: Option<(u64, H256)>) -> io::Result<u32> {
|
|
let mut batch = self.backing().transaction();
|
|
let mut ops = self.journal_under(&mut batch, now, id)?;
|
|
|
|
if let Some((end_era, canon_id)) = end {
|
|
ops += self.mark_canonical(&mut batch, end_era, &canon_id)?;
|
|
}
|
|
|
|
let result = self.backing().write(batch).map(|_| ops).map_err(Into::into);
|
|
self.flush();
|
|
result
|
|
}
|
|
|
|
/// Inject all changes in a single batch.
|
|
#[cfg(test)]
|
|
fn inject_batch(&mut self) -> io::Result<u32> {
|
|
let mut batch = self.backing().transaction();
|
|
let res = self.inject(&mut batch)?;
|
|
self.backing().write(batch).map(|_| res).map_err(Into::into)
|
|
}
|
|
}
|