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// Copyright 2015, 2016 Ethcore (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/>.
use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrder};
use util::*;
use receipt::Receipt;
use blockchain::block_info::{BlockInfo, BlockLocation, BranchBecomingCanonChainData};
Marek Kotewicz
committed
use blockchain::best_block::BestBlock;
use types::tree_route::TreeRoute;
use db::{Writable, Readable, CacheUpdatePolicy, Key};
const LOG_BLOOMS_LEVELS: usize = 3;
const LOG_BLOOMS_ELEMENTS_PER_INDEX: usize = 16;
/// Interface for querying blocks by hash and by number.
pub trait BlockProvider {
/// Returns true if the given block is known
/// (though not necessarily a part of the canon chain).
fn is_known(&self, hash: &H256) -> bool;
/// Get raw block data
fn block(&self, hash: &H256) -> Option<Bytes>;
/// Get the familial details concerning a block.
fn block_details(&self, hash: &H256) -> Option<BlockDetails>;
/// Get the hash of given block's number.
fn block_hash(&self, index: BlockNumber) -> Option<H256>;
/// Get the address of transaction with given hash.
fn transaction_address(&self, hash: &H256) -> Option<TransactionAddress>;
/// Get receipts of block with given hash.
fn block_receipts(&self, hash: &H256) -> Option<BlockReceipts>;
/// Get the partial-header of a block.
fn block_header(&self, hash: &H256) -> Option<Header> {
self.block(hash).map(|bytes| BlockView::new(&bytes).header())
}
/// Get a list of uncles for a given block.
fn uncles(&self, hash: &H256) -> Option<Vec<Header>> {
self.block(hash).map(|bytes| BlockView::new(&bytes).uncles())
}
/// Get a list of uncle hashes for a given block.
/// Returns None if block does not exist.
fn uncle_hashes(&self, hash: &H256) -> Option<Vec<H256>> {
self.block(hash).map(|bytes| BlockView::new(&bytes).uncle_hashes())
}
/// Get the number of given block's hash.
fn block_number(&self, hash: &H256) -> Option<BlockNumber> {
self.block(hash).map(|bytes| BlockView::new(&bytes).header_view().number())
}
/// Get transaction with given transaction hash.
fn transaction(&self, address: &TransactionAddress) -> Option<LocalizedTransaction> {
self.block(&address.block_hash).and_then(|bytes| BlockView::new(&bytes).localized_transaction_at(address.index))
/// Get transaction receipt.
fn transaction_receipt(&self, address: &TransactionAddress) -> Option<Receipt> {
self.block_receipts(&address.block_hash).and_then(|br| br.receipts.into_iter().nth(address.index))
}
/// Returns None if block does not exist.
fn transactions(&self, hash: &H256) -> Option<Vec<LocalizedTransaction>> {
self.block(hash).map(|bytes| BlockView::new(&bytes).localized_transactions())
}
/// Returns reference to genesis hash.
fn genesis_hash(&self) -> H256 {
self.block_hash(0).expect("Genesis hash should always exist")
}
/// Returns the header of the genesis block.
fn genesis_header(&self) -> Header {
self.block_header(&self.genesis_hash()).unwrap()
}
/// Returns numbers of blocks containing given bloom.
fn blocks_with_bloom(&self, bloom: &H2048, from_block: BlockNumber, to_block: BlockNumber) -> Vec<BlockNumber>;
#[derive(Debug, Hash, Eq, PartialEq, Clone)]
BlockDetails(H256),
BlockHashes(BlockNumber),
TransactionAddresses(H256),
BlocksBlooms(LogGroupPosition),
BlockReceipts(H256),
}
struct CacheManager {
cache_usage: VecDeque<HashSet<CacheID>>,
in_use: HashSet<CacheID>,
}
impl bc::group::BloomGroupDatabase for BlockChain {
fn blooms_at(&self, position: &bc::group::GroupPosition) -> Option<bc::group::BloomGroup> {
let position = LogGroupPosition::from(position.clone());
self.note_used(CacheID::BlocksBlooms(position.clone()));
self.extras_db.read_with_cache(&self.blocks_blooms, &position).map(Into::into)
}
}
/// Structure providing fast access to blockchain data.
// All locks must be captured in the order declared here.
pref_cache_size: AtomicUsize,
max_cache_size: AtomicUsize,
block_hashes: RwLock<HashMap<BlockNumber, H256>>,
transaction_addresses: RwLock<HashMap<H256, TransactionAddress>>,
blocks_blooms: RwLock<HashMap<LogGroupPosition, BloomGroup>>,
block_receipts: RwLock<HashMap<H256, BlockReceipts>>,
extras_db: Database,
blocks_db: Database,
cache_man: RwLock<CacheManager>,
impl BlockProvider for BlockChain {
/// Returns true if the given block is known
/// (though not necessarily a part of the canon chain).
fn is_known(&self, hash: &H256) -> bool {
self.extras_db.exists_with_cache(&self.block_details, hash)
}
/// Get raw block data
fn block(&self, hash: &H256) -> Option<Bytes> {
{
let read = self.blocks.read();
if let Some(v) = read.get(hash) {
return Some(v.clone());
}
}
let opt = self.blocks_db.get(hash)
.expect("Low level database error. Some issue with disk?");
match opt {
Some(b) => {
let bytes: Bytes = b.to_vec();
let mut write = self.blocks.write();
write.insert(hash.clone(), bytes.clone());
Some(bytes)
},
None => None
}
}
/// Get the familial details concerning a block.
fn block_details(&self, hash: &H256) -> Option<BlockDetails> {
self.note_used(CacheID::BlockDetails(hash.clone()));
self.extras_db.read_with_cache(&self.block_details, hash)
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