refactored blockchain extras keys building

ethcore/src/blockchain/blockchain.rs

@@ -30,6 +30,7 @@ use blockchain::bloom_indexer::BloomIndexer;
 use blockchain::tree_route::TreeRoute;
 use blockchain::update::ExtrasUpdate;
 use blockchain::{CacheSize, ImportRoute};
+use db::{Writable, Readable, Key};
 
 const BLOOM_INDEX_SIZE: usize = 16;
 const BLOOM_LEVELS: u8 = 3;
@@ -314,8 +315,8 @@ impl BlockChain {
 				bc.blocks_db.put(&hash, genesis).unwrap();
 
 				let batch = DBTransaction::new();
-				batch.put_extras(&hash, &details);
-				batch.put_extras(&header.number(), &hash);
+				batch.write(&hash, &details);
+				batch.write(&header.number(), &hash);
 				batch.put(b"best", &hash).unwrap();
 				bc.extras_db.write(batch).unwrap();
 
@@ -467,7 +468,7 @@ impl BlockChain {
 		{
 			let mut write_details = self.block_details.write().unwrap();
 			for (hash, details) in update.block_details.into_iter() {
-				batch.put_extras(&hash, &details);
+				batch.write(&hash, &details);
 				self.note_used(CacheID::Extras(ExtrasIndex::BlockDetails, hash.clone()));
 				write_details.insert(hash, details);
 			}
@@ -476,7 +477,7 @@ impl BlockChain {
 		{
 			let mut write_receipts = self.block_receipts.write().unwrap();
 			for (hash, receipt) in &update.block_receipts {
-				batch.put_extras(hash, receipt);
+				batch.write(hash, receipt);
 				write_receipts.remove(hash);
 			}
 		}
@@ -484,7 +485,7 @@ impl BlockChain {
 		{
 			let mut write_blocks_blooms = self.blocks_blooms.write().unwrap();
 			for (bloom_hash, blocks_bloom) in &update.blocks_blooms {
-				batch.put_extras(bloom_hash, blocks_bloom);
+				batch.write(bloom_hash, blocks_bloom);
 				write_blocks_blooms.remove(bloom_hash);
 			}
 		}
@@ -508,12 +509,12 @@ impl BlockChain {
 			}
 
 			for (number, hash) in &update.block_hashes {
-				batch.put_extras(number, hash);
+				batch.write(number, hash);
 				write_hashes.remove(number);
 			}
 
 			for (hash, tx_address) in &update.transactions_addresses {
-				batch.put_extras(hash, tx_address);
+				batch.write(hash, tx_address);
 				write_txs.remove(hash);
 			}
 
@@ -747,8 +748,9 @@ impl BlockChain {
 	}
 
 	fn query_extras<K, T>(&self, hash: &K, cache: &RwLock<HashMap<K, T>>) -> Option<T> where
-		T: Clone + Decodable + ExtrasIndexable,
-		K: ExtrasSliceConvertable + Eq + Hash + Clone {
+		T: ExtrasIndexable + Clone + Decodable,
+		K: Key<T> + Eq + Hash + Clone,
+		H256: From<K> {
 		{
 			let read = cache.read().unwrap();
 			if let Some(v) = read.get(hash) {
@@ -756,11 +758,9 @@ impl BlockChain {
 			}
 		}
 
-		if let Some(h) = hash.as_h256() {
-			self.note_used(CacheID::Extras(T::extras_index(), h.clone()));
-		}
+		self.note_used(CacheID::Extras(T::index(), H256::from(hash.clone())));
 
-		self.extras_db.get_extras(hash).map(| t: T | {
+		self.extras_db.read(hash).map(|t: T| {
 			let mut write = cache.write().unwrap();
 			write.insert(hash.clone(), t.clone());
 			t
@@ -768,8 +768,7 @@ impl BlockChain {
 	}
 
 	fn query_extras_exist<K, T>(&self, hash: &K, cache: &RwLock<HashMap<K, T>>) -> bool where
-		K: ExtrasSliceConvertable + Eq + Hash + Clone,
-		T: ExtrasIndexable {
+		K: Key<T> + Eq + Hash + Clone {
 		{
 			let read = cache.read().unwrap();
 			if let Some(_) = read.get(hash) {
@@ -777,7 +776,7 @@ impl BlockChain {
 			}
 		}
 
-		self.extras_db.extras_exists::<_, T>(hash)
+		self.extras_db.exists::<T>(hash)
 	}
 
 	/// Get current cache size.

ethcore/src/db.rs

@@ -0,0 +1,61 @@
+// 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/>.
+
+//! Extras db utils.
+
+use util::{H264, DBTransaction, Database};
+use util::rlp::{encode, Encodable, decode, Decodable};
+
+/// Should be used to get database key associated with given value.
+pub trait Key<T> {
+	/// Returns db key.
+	fn key(&self) -> H264;
+}
+
+/// Should be used to write value into database.
+pub trait Writable {
+	/// Writes key into database.
+	fn write<T>(&self, key: &Key<T>, value: &T) where T: Encodable;
+}
+
+/// Should be used to read values from database.
+pub trait Readable {
+	/// Returns value for given key.
+	fn read<T>(&self, key: &Key<T>) -> Option<T> where T: Decodable;
+	/// Returns true if given value exists.
+	fn exists<T>(&self, key: &Key<T>) -> bool;
+}
+
+impl Writable for DBTransaction {
+	fn write<T>(&self, key: &Key<T>, value: &T) where T: Encodable {
+		self.put(&key.key(), &encode(value))
+			.expect("db put failed");
+	}
+}
+
+impl Readable for Database {
+	fn read<T>(&self, key: &Key<T>) -> Option<T> where T: Decodable {
+		self.get(&key.key())
+			.expect("db get failed")
+			.map(|v| decode(&v))
+	}
+
+	fn exists<T>(&self, key: &Key<T>) -> bool {
+		self.get(&key.key())
+			.expect("db get failed")
+			.is_some()
+	}
+}

ethcore/src/extras.rs

@@ -19,6 +19,7 @@
 use util::*;
 use header::BlockNumber;
 use receipt::Receipt;
+use db::Key;
 
 /// Represents index of extra data in database
 #[derive(Copy, Debug, Hash, Eq, PartialEq, Clone)]
@@ -37,95 +38,88 @@ pub enum ExtrasIndex {
 	BlockReceipts = 5,
 }
 
-/// trait used to write Extras data to db
-pub trait ExtrasWritable {
-	/// Write extra data to db
-	fn put_extras<K, T>(&self, hash: &K, value: &T) where
-		T: ExtrasIndexable + Encodable,
-		K: ExtrasSliceConvertable;
+fn with_index(hash: &H256, i: ExtrasIndex) -> H264 {
+	let mut slice = H264::from_slice(hash);
+	slice[32] = i as u8;
+	slice
 }
 
-/// trait used to read Extras data from db
-pub trait ExtrasReadable {
-	/// Read extra data from db
-	fn get_extras<K, T>(&self, hash: &K) -> Option<T> where
-		T: ExtrasIndexable + Decodable,
-		K: ExtrasSliceConvertable;
-
-	/// Check if extra data exists in the db
-	fn extras_exists<K, T>(&self, hash: &K) -> bool where
-		T: ExtrasIndexable,
-		K: ExtrasSliceConvertable;
-}
-
-impl ExtrasWritable for DBTransaction {
-	fn put_extras<K, T>(&self, hash: &K, value: &T) where
-		T: ExtrasIndexable + Encodable,
-		K: ExtrasSliceConvertable {
-
-		self.put(&hash.to_extras_slice(T::extras_index()), &encode(value)).unwrap()
-	}
-}
-
-impl ExtrasReadable for Database {
-	fn get_extras<K, T>(&self, hash: &K) -> Option<T> where
-		T: ExtrasIndexable + Decodable,
-		K: ExtrasSliceConvertable {
-
-		self.get(&hash.to_extras_slice(T::extras_index())).unwrap()
-			.map(|v| decode(&v))
-	}
-
-	fn extras_exists<K, T>(&self, hash: &K) -> bool where
-		T: ExtrasIndexable,
-		K: ExtrasSliceConvertable {
-
-		self.get(&hash.to_extras_slice(T::extras_index())).unwrap().is_some()
-	}
-}
-
-/// Implementations should convert arbitrary type to database key slice
-pub trait ExtrasSliceConvertable {
-	/// Convert self, with `i` (the index), to a 264-bit extras DB key.
-	fn to_extras_slice(&self, i: ExtrasIndex) -> H264;
-	/// Interpret self as a 256-bit hash, if natively `H256`.
-	fn as_h256(&self) -> Option<&H256> { None }
-}
-
-impl ExtrasSliceConvertable for H256 {
-	fn to_extras_slice(&self, i: ExtrasIndex) -> H264 {
-		let mut slice = H264::from_slice(self);
-		slice[32] = i as u8;
-		slice
-	}
-	fn as_h256(&self) -> Option<&H256> { Some(self) }
-}
-
-impl ExtrasSliceConvertable for U256 {
-	fn to_extras_slice(&self, i: ExtrasIndex) -> H264 {
-		H256::from(self).to_extras_slice(i)
-	}
-}
-
-// NICE: make less horrible.
-impl ExtrasSliceConvertable for BlockNumber {
-	fn to_extras_slice(&self, i: ExtrasIndex) -> H264 {
-		U256::from(*self).to_extras_slice(i)
-	}
-}
-
-/// Types implementing this trait can be indexed in extras database
 pub trait ExtrasIndexable {
-	/// Returns this data index
-	fn extras_index() -> ExtrasIndex;
+	fn index() -> ExtrasIndex;
 }
 
 impl ExtrasIndexable for H256 {
-	fn extras_index() -> ExtrasIndex {
+	fn index() -> ExtrasIndex {
 		ExtrasIndex::BlockHash
 	}
 }
 
+impl ExtrasIndexable for BlockDetails {
+	fn index() -> ExtrasIndex {
+		ExtrasIndex::BlockDetails
+	}
+}
+
+impl ExtrasIndexable for TransactionAddress {
+	fn index() -> ExtrasIndex {
+		ExtrasIndex::TransactionAddress
+	}
+}
+
+impl ExtrasIndexable for BlockLogBlooms {
+	fn index() -> ExtrasIndex {
+		ExtrasIndex::BlockLogBlooms
+	}
+}
+
+impl ExtrasIndexable for BlocksBlooms {
+	fn index() -> ExtrasIndex {
+		ExtrasIndex::BlocksBlooms
+	}
+}
+
+impl ExtrasIndexable for BlockReceipts {
+	fn index() -> ExtrasIndex {
+		ExtrasIndex::BlockReceipts
+	}
+}
+
+impl Key<H256> for BlockNumber {
+	fn key(&self) -> H264 {
+		with_index(&H256::from(*self), ExtrasIndex::BlockHash)
+	}
+}
+
+impl Key<BlockDetails> for H256 {
+	fn key(&self) -> H264 {
+		with_index(self, ExtrasIndex::BlockDetails)
+	}
+}
+
+impl Key<TransactionAddress> for H256 {
+	fn key(&self) -> H264 {
+		with_index(self, ExtrasIndex::TransactionAddress)
+	}
+}
+
+impl Key<BlockLogBlooms> for H256 {
+	fn key(&self) -> H264 {
+		with_index(self, ExtrasIndex::BlockLogBlooms)
+	}
+}
+
+impl Key<BlocksBlooms> for H256 {
+	fn key(&self) -> H264 {
+		with_index(self, ExtrasIndex::BlocksBlooms)
+	}
+}
+
+impl Key<BlockReceipts> for H256 {
+	fn key(&self) -> H264 {
+		with_index(self, ExtrasIndex::BlockReceipts)
+	}
+}
+
 /// Familial details concerning a block
 #[derive(Debug, Clone)]
 pub struct BlockDetails {
@@ -139,12 +133,6 @@ pub struct BlockDetails {
 	pub children: Vec<H256>
 }
 
-impl ExtrasIndexable for BlockDetails {
-	fn extras_index() -> ExtrasIndex {
-		ExtrasIndex::BlockDetails
-	}
-}
-
 impl HeapSizeOf for BlockDetails {
 	fn heap_size_of_children(&self) -> usize {
 		self.children.heap_size_of_children()
@@ -181,12 +169,6 @@ pub struct BlockLogBlooms {
 	pub blooms: Vec<H2048>
 }
 
-impl ExtrasIndexable for BlockLogBlooms {
-	fn extras_index() -> ExtrasIndex {
-		ExtrasIndex::BlockLogBlooms
-	}
-}
-
 impl HeapSizeOf for BlockLogBlooms {
 	fn heap_size_of_children(&self) -> usize {
 		self.blooms.heap_size_of_children()
@@ -227,12 +209,6 @@ impl BlocksBlooms {
 	}
 }
 
-impl ExtrasIndexable for BlocksBlooms {
-	fn extras_index() -> ExtrasIndex {
-		ExtrasIndex::BlocksBlooms
-	}
-}
-
 impl HeapSizeOf for BlocksBlooms {
 	fn heap_size_of_children(&self) -> usize { 0 }
 }
@@ -277,12 +253,6 @@ pub struct TransactionAddress {
 	pub index: usize
 }
 
-impl ExtrasIndexable for TransactionAddress {
-	fn extras_index() -> ExtrasIndex {
-		ExtrasIndex::TransactionAddress
-	}
-}
-
 impl HeapSizeOf for TransactionAddress {
 	fn heap_size_of_children(&self) -> usize { 0 }
 }
@@ -340,9 +310,3 @@ impl HeapSizeOf for BlockReceipts {
 		self.receipts.heap_size_of_children()
 	}
 }
-
-impl ExtrasIndexable for BlockReceipts {
-	fn extras_index() -> ExtrasIndex {
-		ExtrasIndex::BlockReceipts
-	}
-}

ethcore/src/lib.rs

@@ -104,6 +104,7 @@ pub mod views;
 pub mod receipt;
 pub mod pod_state;
 
+mod db;
 mod common;
 mod basic_types;
 #[macro_use] mod evm;