perf(ethcore): `micro-opt` (#10405)

Mostly fixes that changes `eagerly eval` to `lazy eval`

ethcore/light/src/on_demand/mod.rs

@@ -24,7 +24,6 @@ use std::marker::PhantomData;
 use std::sync::Arc;
 use std::time::Duration;
 
-use ethcore::executed::{Executed, ExecutionError};
 use futures::{Poll, Future, Async};
 use futures::sync::oneshot::{self, Receiver};
 use network::PeerId;
@@ -41,10 +40,10 @@ use cache::Cache;
 use request::{self as basic_request, Request as NetworkRequest};
 use self::request::CheckedRequest;
 
+pub use ethcore::executed::ExecutionResult;
 pub use self::request::{Request, Response, HeaderRef, Error as ValidityError};
 pub use self::request_guard::{RequestGuard, Error as RequestError};
 pub use self::response_guard::{ResponseGuard, Error as ResponseGuardError, Inner as ResponseGuardInner};
-
 pub use types::request::ResponseError;
 
 #[cfg(test)]
@@ -54,9 +53,6 @@ pub mod request;
 mod request_guard;
 mod response_guard;
 
-/// The result of execution
-pub type ExecutionResult = Result<Executed, ExecutionError>;
-
 /// The initial backoff interval for OnDemand queries
 pub const DEFAULT_REQUEST_MIN_BACKOFF_DURATION: Duration = Duration::from_secs(10);
 /// The maximum request interval for OnDemand queries

ethcore/src/client/client.rs

@@ -1149,7 +1149,7 @@ impl Client {
 	pub fn take_snapshot<W: snapshot_io::SnapshotWriter + Send>(&self, writer: W, at: BlockId, p: &snapshot::Progress) -> Result<(), EthcoreError> {
 		let db = self.state_db.read().journal_db().boxed_clone();
 		let best_block_number = self.chain_info().best_block_number;
-		let block_number = self.block_number(at).ok_or(snapshot::Error::InvalidStartingBlock(at))?;
+		let block_number = self.block_number(at).ok_or_else(|| snapshot::Error::InvalidStartingBlock(at))?;
 
 		if db.is_pruned() && self.pruning_info().earliest_state > block_number {
 			return Err(snapshot::Error::OldBlockPrunedDB.into());

ethcore/src/engines/authority_round/mod.rs

@@ -512,15 +512,19 @@ fn header_expected_seal_fields(header: &Header, empty_steps_transition: u64) ->
 }
 
 fn header_step(header: &Header, empty_steps_transition: u64) -> Result<u64, ::rlp::DecoderError> {
-	let expected_seal_fields = header_expected_seal_fields(header, empty_steps_transition);
-	Rlp::new(&header.seal().get(0).expect(
-		&format!("was either checked with verify_block_basic or is genesis; has {} fields; qed (Make sure the spec file has a correct genesis seal)", expected_seal_fields))).as_val()
+	Rlp::new(&header.seal().get(0).unwrap_or_else(||
+		panic!("was either checked with verify_block_basic or is genesis; has {} fields; qed (Make sure the spec
+				file has a correct genesis seal)", header_expected_seal_fields(header, empty_steps_transition))
+	))
+	.as_val()
 }
 
 fn header_signature(header: &Header, empty_steps_transition: u64) -> Result<Signature, ::rlp::DecoderError> {
-	let expected_seal_fields = header_expected_seal_fields(header, empty_steps_transition);
-	Rlp::new(&header.seal().get(1).expect(
-		&format!("was checked with verify_block_basic; has {} fields; qed", expected_seal_fields))).as_val::<H520>().map(Into::into)
+	Rlp::new(&header.seal().get(1).unwrap_or_else(||
+		panic!("was checked with verify_block_basic; has {} fields; qed",
+			   header_expected_seal_fields(header, empty_steps_transition))
+	))
+	.as_val::<H520>().map(Into::into)
 }
 
 // extracts the raw empty steps vec from the header seal. should only be called when there are 3 fields in the seal
@@ -934,8 +938,12 @@ impl Engine<EthereumMachine> for AuthorityRound {
 			return BTreeMap::default();
 		}
 
-		let step = header_step(header, self.empty_steps_transition).as_ref().map(ToString::to_string).unwrap_or("".into());
-		let signature = header_signature(header, self.empty_steps_transition).as_ref().map(ToString::to_string).unwrap_or("".into());
+		let step = header_step(header, self.empty_steps_transition).as_ref()
+			.map(ToString::to_string)
+			.unwrap_or_default();
+		let signature = header_signature(header, self.empty_steps_transition).as_ref()
+			.map(ToString::to_string)
+			.unwrap_or_default();
 
 		let mut info = map![
 			"step".into() => step,

ethcore/src/engines/validator_set/multi.rs

@@ -74,7 +74,7 @@ impl Multi {
 impl ValidatorSet for Multi {
 	fn default_caller(&self, block_id: BlockId) -> Box<Call> {
 		self.correct_set(block_id).map(|set| set.default_caller(block_id))
-			.unwrap_or(Box::new(|_, _| Err("No validator set for given ID.".into())))
+			.unwrap_or_else(|| Box::new(|_, _| Err("No validator set for given ID.".into())))
 	}
 
 	fn on_epoch_begin(&self, _first: bool, header: &Header, call: &mut SystemCall) -> Result<(), ::error::Error> {
@@ -141,7 +141,7 @@ impl ValidatorSet for Multi {
 		*self.block_number.write() = Box::new(move |id| client
 			.upgrade()
 			.ok_or_else(|| "No client!".into())
-			.and_then(|c| c.block_number(id).ok_or("Unknown block".into())));
+			.and_then(|c| c.block_number(id).ok_or_else(|| "Unknown block".into())));
 	}
 }
 

ethcore/src/error.rs

@@ -37,7 +37,7 @@ use engines::EngineError;
 
 pub use executed::{ExecutionError, CallError};
 
-#[derive(Debug, PartialEq, Clone, Copy, Eq)]
+#[derive(Debug, PartialEq, Clone, Eq)]
 /// Errors concerning block processing.
 pub enum BlockError {
 	/// Block has too many uncles.
@@ -88,7 +88,7 @@ pub enum BlockError {
 	/// Timestamp header field is too far in future.
 	TemporarilyInvalid(OutOfBounds<SystemTime>),
 	/// Log bloom header field is invalid.
-	InvalidLogBloom(Mismatch<Bloom>),
+	InvalidLogBloom(Box<Mismatch<Bloom>>),
 	/// Number field of header is invalid.
 	InvalidNumber(Mismatch<BlockNumber>),
 	/// Block number isn't sensible.

ethcore/src/executed.rs

@@ -197,4 +197,4 @@ impl fmt::Display for CallError {
 }
 
 /// Transaction execution result.
-pub type ExecutionResult = Result<Executed, ExecutionError>;
+pub type ExecutionResult = Result<Box<Executed>, ExecutionError>;

ethcore/src/externalities.rs

@@ -117,7 +117,7 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 {
 	fn initial_storage_at(&self, key: &H256) -> vm::Result<H256> {
 		if self.state.is_base_storage_root_unchanged(&self.origin_info.address)? {
-			self.state.checkpoint_storage_at(0, &self.origin_info.address, key).map(|v| v.unwrap_or(H256::zero())).map_err(Into::into)
+			self.state.checkpoint_storage_at(0, &self.origin_info.address, key).map(|v| v.unwrap_or_default()).map_err(Into::into)
 		} else {
 			warn!(target: "externalities", "Detected existing account {:#x} where a forced contract creation happened.", self.origin_info.address);
 			Ok(H256::zero())

ethcore/src/machine.rs

@@ -173,7 +173,7 @@ impl EthereumMachine {
 			origin: SYSTEM_ADDRESS,
 			gas,
 			gas_price: 0.into(),
-			value: value.unwrap_or(ActionValue::Transfer(0.into())),
+			value: value.unwrap_or_else(|| ActionValue::Transfer(0.into())),
 			code,
 			code_hash,
 			data,

ethcore/src/snapshot/consensus/authority.rs

@@ -76,7 +76,7 @@ impl SnapshotComponents for PoaSnapshot {
 			}
 
 			let header = chain.block_header_data(&transition.block_hash)
-				.ok_or(Error::BlockNotFound(transition.block_hash))?;
+				.ok_or_else(|| Error::BlockNotFound(transition.block_hash))?;
 
 			let entry = {
 				let mut entry_stream = RlpStream::new_list(2);
@@ -101,12 +101,12 @@ impl SnapshotComponents for PoaSnapshot {
 
 		let (block, receipts) = chain.block(&block_at)
 			.and_then(|b| chain.block_receipts(&block_at).map(|r| (b, r)))
-			.ok_or(Error::BlockNotFound(block_at))?;
+			.ok_or_else(|| Error::BlockNotFound(block_at))?;
 		let block = block.decode()?;
 
 		let parent_td = chain.block_details(block.header.parent_hash())
 			.map(|d| d.total_difficulty)
-			.ok_or(Error::BlockNotFound(block_at))?;
+			.ok_or_else(|| Error::BlockNotFound(block_at))?;
 
 		rlps.push({
 			let mut stream = RlpStream::new_list(5);

ethcore/src/snapshot/consensus/work.rs

@@ -116,7 +116,7 @@ impl<'a> PowWorker<'a> {
 
 			let (block, receipts) = self.chain.block(&self.current_hash)
 				.and_then(|b| self.chain.block_receipts(&self.current_hash).map(|r| (b, r)))
-				.ok_or(Error::BlockNotFound(self.current_hash))?;
+				.ok_or_else(|| Error::BlockNotFound(self.current_hash))?;
 
 			let abridged_rlp = AbridgedBlock::from_block_view(&block.view()).into_inner();
 
@@ -160,7 +160,7 @@ impl<'a> PowWorker<'a> {
 
 		let (last_header, last_details) = self.chain.block_header_data(&last)
 			.and_then(|n| self.chain.block_details(&last).map(|d| (n, d)))
-			.ok_or(Error::BlockNotFound(last))?;
+			.ok_or_else(|| Error::BlockNotFound(last))?;
 
 		let parent_number = last_header.number() - 1;
 		let parent_hash = last_header.parent_hash();

ethcore/src/snapshot/mod.rs

@@ -157,7 +157,7 @@ pub fn take_snapshot<W: SnapshotWriter + Send>(
 	processing_threads: usize,
 ) -> Result<(), Error> {
 	let start_header = chain.block_header_data(&block_at)
-		.ok_or(Error::InvalidStartingBlock(BlockId::Hash(block_at)))?;
+		.ok_or_else(|| Error::InvalidStartingBlock(BlockId::Hash(block_at)))?;
 	let state_root = start_header.state_root();
 	let number = start_header.number();
 
@@ -512,7 +512,7 @@ fn rebuild_accounts(
 			// fill out the storage trie and code while decoding.
 			let (acc, maybe_code) = {
 				let mut acct_db = AccountDBMut::from_hash(db, hash);
-				let storage_root = known_storage_roots.get(&hash).cloned().unwrap_or(H256::zero());
+				let storage_root = known_storage_roots.get(&hash).cloned().unwrap_or_default();
 				account::from_fat_rlp(&mut acct_db, fat_rlp, storage_root)?
 			};
 

ethcore/src/spec/spec.rs

@@ -515,7 +515,7 @@ fn load_from(spec_params: SpecParams, s: ethjson::spec::Spec) -> Result<Spec, Er
 				chts: s.hardcoded_sync
 					.as_ref()
 					.map(|s| s.chts.iter().map(|c| c.clone().into()).collect())
-					.unwrap_or(Vec::new()),
+					.unwrap_or_default()
 			})
 		} else {
 			None

ethcore/src/state/mod.rs

@@ -82,8 +82,8 @@ pub enum ProvedExecution {
 	BadProof,
 	/// The transaction failed, but not due to a bad proof.
 	Failed(ExecutionError),
-	/// The transaction successfully completd with the given proof.
-	Complete(Executed),
+	/// The transaction successfully completed with the given proof.
+	Complete(Box<Executed>),
 }
 
 #[derive(Eq, PartialEq, Clone, Copy, Debug)]
@@ -218,7 +218,7 @@ pub fn check_proof(
 
 	let options = TransactOptions::with_no_tracing().save_output_from_contract();
 	match state.execute(env_info, machine, transaction, options, true) {
-		Ok(executed) => ProvedExecution::Complete(executed),
+		Ok(executed) => ProvedExecution::Complete(Box::new(executed)),
 		Err(ExecutionError::Internal(_)) => ProvedExecution::BadProof,
 		Err(e) => ProvedExecution::Failed(e),
 	}
@@ -1254,7 +1254,7 @@ impl<B: Backend> State<B> {
 		let trie = TrieDB::new(db, &self.root)?;
 		let maybe_account: Option<BasicAccount> = {
 			let panicky_decoder = |bytes: &[u8]| {
-				::rlp::decode(bytes).expect(&format!("prove_account, could not query trie for account key={}", &account_key))
+				::rlp::decode(bytes).unwrap_or_else(|_| panic!("prove_account, could not query trie for account key={}", &account_key))
 			};
 			let query = (&mut recorder, panicky_decoder);
 			trie.get_with(&account_key, query)?

ethcore/src/verification/verification.rs

@@ -274,7 +274,7 @@ pub fn verify_block_final(expected: &Header, got: &Header) -> Result<(), Error>
 		return Err(From::from(BlockError::InvalidGasUsed(Mismatch { expected: *expected.gas_used(), found: *got.gas_used() })))
 	}
 	if expected.log_bloom() != got.log_bloom() {
-		return Err(From::from(BlockError::InvalidLogBloom(Mismatch { expected: *expected.log_bloom(), found: *got.log_bloom() })))
+		return Err(From::from(BlockError::InvalidLogBloom(Box::new(Mismatch { expected: *expected.log_bloom(), found: *got.log_bloom() }))))
 	}
 	if expected.receipts_root() != got.receipts_root() {
 		return Err(From::from(BlockError::InvalidReceiptsRoot(Mismatch { expected: *expected.receipts_root(), found: *got.receipts_root() })))

ethcore/types/src/ids.rs

@@ -17,7 +17,7 @@
 //! Unique identifiers.
 
 use ethereum_types::H256;
-use {BlockNumber};
+use BlockNumber;
 
 /// Uniquely identifies block.
 #[derive(Debug, PartialEq, Copy, Clone, Hash, Eq)]