Fill transaction hash on ethGetLog of light client. (#9938)

* Fill transaction hash on ethGetLog of light client. This is enifficient
but we keep align with spec.

* Using better variables names.

* Expose old fast light get log as `parity_getLogsLight`.

* Update rpc/src/v1/helpers/light_fetch.rs

Fix indent.

Co-Authored-By: cheme <emericchevalier.pro@gmail.com>

* Factor common code between light_logs and logs.

* Remove useless check

* Rename parity light logs to 'parity_getLogsNoTransactionHash'.
Fix indent and extra white lines.

* Use vec instead of tree map to avoid inner function.

* better loop

rpc/src/v1/helpers/light_fetch.rs

@@ -46,6 +46,7 @@ use ethereum_types::{U256, Address};
 use hash::H256;
 use parking_lot::Mutex;
 use fastmap::H256FastMap;
+use std::collections::BTreeMap;
 use transaction::{Action, Transaction as EthTransaction, PendingTransaction, SignedTransaction, LocalizedTransaction};
 
 use v1::helpers::{CallRequest as CallRequestHelper, errors, dispatch};
@@ -310,9 +311,7 @@ impl LightFetch {
 		}))
 	}
 
-	/// Get transaction logs
-	pub fn logs(&self, filter: EthcoreFilter) -> impl Future<Item = Vec<Log>, Error = Error> + Send {
-		use std::collections::BTreeMap;
+	pub fn logs_no_tx_hash(&self, filter: EthcoreFilter) -> impl Future<Item = Vec<Log>, Error = Error> + Send {
 		use jsonrpc_core::futures::stream::{self, Stream};
 
 		const MAX_BLOCK_RANGE: u64 = 1000;
@@ -343,7 +342,7 @@ impl LightFetch {
 					// insert them into a BTreeMap to maintain order by number and block index.
 					stream::futures_unordered(receipts_futures)
 						.fold(BTreeMap::new(), move |mut matches, (num, hash, receipts)| {
-							let mut block_index = 0;
+							let mut block_index: usize = 0;
 							for (transaction_index, receipt) in receipts.into_iter().enumerate() {
 								for (transaction_log_index, log) in receipt.logs.into_iter().enumerate() {
 									if filter.matches(&log) {
@@ -366,9 +365,9 @@ impl LightFetch {
 								}
 							}
 							future::ok::<_,OnDemandError>(matches)
-						}) // and then collect them into a vector.
-						.map(|matches| matches.into_iter().map(|(_, v)| v).collect())
+						})
 						.map_err(errors::on_demand_error)
+						.map(|matches| matches.into_iter().map(|(_, v)| v).collect())
 				});
 
 				match maybe_future {
@@ -378,6 +377,39 @@ impl LightFetch {
 			})
 	}
 
+
+	/// Get transaction logs
+	pub fn logs(&self, filter: EthcoreFilter) -> impl Future<Item = Vec<Log>, Error = Error> + Send {
+		use jsonrpc_core::futures::stream::{self, Stream};
+		let fetcher_block = self.clone();
+		self.logs_no_tx_hash(filter)
+			// retrieve transaction hash.
+			.and_then(move |mut result| {
+				let mut blocks = BTreeMap::new();
+				for log in result.iter() {
+						let block_hash = log.block_hash.as_ref().expect("Previously initialized with value; qed");
+						blocks.entry(block_hash.clone()).or_insert_with(|| {
+							fetcher_block.block(BlockId::Hash(block_hash.clone().into()))
+						});
+				}
+				// future get blocks (unordered it)
+				stream::futures_unordered(blocks.into_iter().map(|(_, v)| v)).collect().map(move |blocks| {
+					let transactions_per_block: BTreeMap<_, _> = blocks.iter()
+						.map(|block| (block.hash(), block.transactions())).collect();
+					for log in result.iter_mut() {
+						let log_index: U256 = log.transaction_index.expect("Previously initialized with value; qed").into();
+						let block_hash = log.block_hash.clone().expect("Previously initialized with value; qed").into();
+						let tx_hash = transactions_per_block.get(&block_hash)
+							// transaction index is from an enumerate call in log common so not need to check value
+							.and_then(|txs| txs.get(log_index.as_usize()))
+							.map(|tr| tr.hash().into());
+						log.transaction_hash = tx_hash;
+					}
+					result
+				})
+			})
+	}
+
 	// Get a transaction by hash. also returns the index in the block.
 	// Only returns transactions in the canonical chain.
 	pub fn transaction_by_hash(&self, tx_hash: H256)

rpc/src/v1/impls/eth.rs

@@ -146,6 +146,33 @@ enum PendingTransactionId {
 	Location(PendingOrBlock, usize)
 }
 
+pub fn base_logs<C, M, T: StateInfo + 'static> (client: &C, miner: &M, filter: Filter) -> BoxFuture<Vec<Log>> where
+	C: miner::BlockChainClient + BlockChainClient + StateClient<State=T> + Call<State=T>,
+	M: MinerService<State=T> {
+	let include_pending = filter.to_block == Some(BlockNumber::Pending);
+	let filter: EthcoreFilter = match filter.try_into() {
+		Ok(value) => value,
+		Err(err) => return Box::new(future::err(err)),
+	};
+	let mut logs = match client.logs(filter.clone()) {
+		Ok(logs) => logs
+			.into_iter()
+			.map(From::from)
+			.collect::<Vec<Log>>(),
+		Err(id) => return Box::new(future::err(errors::filter_block_not_found(id))),
+	};
+
+	if include_pending {
+		let best_block = client.chain_info().best_block_number;
+		let pending = pending_logs(&*miner, best_block, &filter);
+		logs.extend(pending);
+	}
+
+	let logs = limit_logs(logs, filter.limit);
+
+	Box::new(future::ok(logs))
+}
+
 impl<C, SN: ?Sized, S: ?Sized, M, EM, T: StateInfo + 'static> EthClient<C, SN, S, M, EM> where
 	C: miner::BlockChainClient + BlockChainClient + StateClient<State=T> + Call<State=T> + EngineInfo,
 	SN: SnapshotService,
@@ -803,28 +830,7 @@ impl<C, SN: ?Sized, S: ?Sized, M, EM, T: StateInfo + 'static> Eth for EthClient<
 	}
 
 	fn logs(&self, filter: Filter) -> BoxFuture<Vec<Log>> {
-		let include_pending = filter.to_block == Some(BlockNumber::Pending);
-		let filter: EthcoreFilter = match filter.try_into() {
-			Ok(value) => value,
-			Err(err) => return Box::new(future::err(err)),
-		};
-		let mut logs = match self.client.logs(filter.clone()) {
-			Ok(logs) => logs
-				.into_iter()
-				.map(From::from)
-				.collect::<Vec<Log>>(),
-			Err(id) => return Box::new(future::err(errors::filter_block_not_found(id))),
-		};
-
-		if include_pending {
-			let best_block = self.client.chain_info().best_block_number;
-			let pending = pending_logs(&*self.miner, best_block, &filter);
-			logs.extend(pending);
-		}
-
-		let logs = limit_logs(logs, filter.limit);
-
-		Box::new(future::ok(logs))
+		base_logs(&*self.client, &*self.miner, filter.into())
 	}
 
 	fn work(&self, no_new_work_timeout: Trailing<u64>) -> Result<Work> {

rpc/src/v1/impls/light/parity.rs

@@ -28,7 +28,7 @@ use ethcore::account_provider::AccountProvider;
 use ethcore_logger::RotatingLogger;
 
 use jsonrpc_core::{Result, BoxFuture};
-use jsonrpc_core::futures::Future;
+use jsonrpc_core::futures::{future, Future};
 use jsonrpc_macros::Trailing;
 use v1::helpers::{self, errors, ipfs, SigningQueue, SignerService, NetworkSettings, verify_signature};
 use v1::helpers::dispatch::LightDispatcher;
@@ -41,7 +41,8 @@ use v1::types::{
 	TransactionStats, LocalTransactionStatus,
 	LightBlockNumber, ChainStatus, Receipt,
 	BlockNumber, ConsensusCapability, VersionInfo,
-	OperationsInfo, AccountInfo, HwAccountInfo, Header, RichHeader, RecoveredAccount
+	OperationsInfo, AccountInfo, HwAccountInfo, Header, RichHeader, RecoveredAccount,
+	Log, Filter,
 };
 use Host;
 
@@ -425,6 +426,15 @@ impl Parity for ParityClient {
 			Err(errors::status_error(has_peers))
 		}
 	}
+
+	fn logs_no_tx_hash(&self, filter: Filter) -> BoxFuture<Vec<Log>> {
+    let filter = match filter.try_into() {
+			Ok(value) => value,
+			Err(err) => return Box::new(future::err(err)),
+		};
+		Box::new(self.fetcher().logs_no_tx_hash(filter)) as BoxFuture<_>
+	}
+
 	fn verify_signature(&self, is_prefixed: bool, message: Bytes, r: H256, s: H256, v: U64) -> Result<RecoveredAccount> {
 		verify_signature(is_prefixed, message, r, s, v, self.light_dispatch.client.signing_chain_id())
 	}

rpc/src/v1/impls/parity.rs

@@ -47,7 +47,7 @@ use v1::types::{
 	Peers, Transaction, RpcSettings, Histogram,
 	TransactionStats, LocalTransactionStatus,
 	BlockNumber, ConsensusCapability, VersionInfo,
-	OperationsInfo, ChainStatus,
+	OperationsInfo, ChainStatus, Log, Filter,
 	AccountInfo, HwAccountInfo, RichHeader, Receipt, RecoveredAccount,
 	block_number_to_id
 };
@@ -505,6 +505,12 @@ impl<C, M, U, S> Parity for ParityClient<C, M, U> where
 		}
 	}
 
+	fn logs_no_tx_hash(&self, filter: Filter) -> BoxFuture<Vec<Log>> {
+		use v1::impls::eth::base_logs;
+		// only specific impl for lightclient
+		base_logs(&*self.client, &*self.miner, filter.into())
+	}
+
 	fn verify_signature(&self, is_prefixed: bool, message: Bytes, r: H256, s: H256, v: U64) -> Result<RecoveredAccount> {
 		verify_signature(is_prefixed, message, r, s, v, self.client.signing_chain_id())
 	}

rpc/src/v1/traits/parity.rs

@@ -25,7 +25,7 @@ use v1::types::{
 	Peers, Transaction, RpcSettings, Histogram, RecoveredAccount,
 	TransactionStats, LocalTransactionStatus,
 	BlockNumber, ConsensusCapability, VersionInfo,
-	OperationsInfo, ChainStatus,
+	OperationsInfo, ChainStatus, Log, Filter,
 	AccountInfo, HwAccountInfo, RichHeader, Receipt,
 };
 
@@ -241,5 +241,11 @@ build_rpc_trait! {
 		/// as well as checks the signature for chain replay protection
 		#[rpc(name = "parity_verifySignature")]
 		fn verify_signature(&self, bool, Bytes, H256, H256, U64) -> Result<RecoveredAccount>;
+
+		/// Returns logs matching given filter object.
+		/// Is allowed to skip filling transaction hash for faster query.
+		#[rpc(name = "parity_getLogsNoTransactionHash")]
+		fn logs_no_tx_hash(&self, Filter) -> BoxFuture<Vec<Log>>;
+
 	}
 }