Grab bag of cleanup (#11504)

Formatting, docs, pass TransactOptions instead of tracers.

ethcore/db/src/cache_manager.rs

@@ -33,9 +33,9 @@ impl<T> CacheManager<T> where T: Eq + Hash {
 	/// Create new cache manager with preferred (heap) sizes.
 	pub fn new(pref_cache_size: usize, max_cache_size: usize, bytes_per_cache_entry: usize) -> Self {
 		CacheManager {
-			pref_cache_size: pref_cache_size,
-			max_cache_size: max_cache_size,
-			bytes_per_cache_entry: bytes_per_cache_entry,
+			pref_cache_size,
+			max_cache_size,
+			bytes_per_cache_entry,
 			cache_usage: (0..COLLECTION_QUEUE_SIZE).into_iter().map(|_| Default::default()).collect(),
 		}
 	}

ethcore/executive-state/src/lib.rs

@@ -154,13 +154,12 @@ pub trait ExecutiveState {
 
 	/// Execute a given transaction with given tracer and VM tracer producing a receipt and an optional trace.
 	/// This will change the state accordingly.
-	fn apply_with_tracing<V, T>(
+	fn apply_with_tracing<T, V>(
 		&mut self,
 		env_info: &EnvInfo,
 		machine: &Machine,
 		t: &SignedTransaction,
-		tracer: T,
-		vm_tracer: V,
+		options: TransactOptions<T, V>,
 	) -> ApplyResult<T::Output, V::Output>
 		where
 			T: trace::Tracer,
@@ -179,28 +178,26 @@ impl<B: Backend> ExecutiveState for State<B> {
 	) -> ApplyResult<FlatTrace, VMTrace> {
 		if tracing {
 			let options = TransactOptions::with_tracing();
-			self.apply_with_tracing(env_info, machine, t, options.tracer, options.vm_tracer)
+			self.apply_with_tracing(env_info, machine, t, options)
 		} else {
 			let options = TransactOptions::with_no_tracing();
-			self.apply_with_tracing(env_info, machine, t, options.tracer, options.vm_tracer)
+			self.apply_with_tracing(env_info, machine, t, options)
 		}
 	}
 
 	/// Execute a given transaction with given tracer and VM tracer producing a receipt and an optional trace.
 	/// This will change the state accordingly.
-	fn apply_with_tracing<V, T>(
+	fn apply_with_tracing<T, V>(
 		&mut self,
 		env_info: &EnvInfo,
 		machine: &Machine,
 		t: &SignedTransaction,
-		tracer: T,
-		vm_tracer: V,
+		options: TransactOptions<T, V>
 	) -> ApplyResult<T::Output, V::Output>
 		where
 			T: trace::Tracer,
 			V: trace::VMTracer,
 	{
-		let options = TransactOptions::new(tracer, vm_tracer);
 		let e = execute(self, env_info, machine, t, options, false)?;
 		let params = machine.params();
 

ethcore/src/test_helpers/evm_test_client.rs

@@ -271,7 +271,8 @@ impl<'a> EvmTestClient<'a> {
 		}
 
 		// Apply transaction
-		let result = self.state.apply_with_tracing(&env_info, self.spec.engine.machine(), &transaction, tracer, vm_tracer);
+		let trace_opts = executive::TransactOptions::new(tracer, vm_tracer);
+		let result = self.state.apply_with_tracing(&env_info, self.spec.engine.machine(), &transaction, trace_opts);
 		let scheme = CreateContractAddress::FromSenderAndNonce;
 
 		// Touch the coinbase at the end of the test to simulate

ethcore/trace/src/config.rs

@@ -22,9 +22,9 @@ pub struct Config {
 	/// Indicates if tracing should be enabled or not.
 	/// If it's None, it will be automatically configured.
 	pub enabled: bool,
-	/// Preferred cache-size.
+	/// Preferred cache-size (default: 15Mb).
 	pub pref_cache_size: usize,
-	/// Max cache-size.
+	/// Max cache-size (default: 20Mb).
 	pub max_cache_size: usize,
 }
 

ethcore/trace/src/db.rs

@@ -239,13 +239,15 @@ impl<T> TraceDatabase for TraceDB<T> where T: DatabaseExtras {
 			let enacted_blooms: Vec<_> = request.enacted
 				.iter()
 				// all traces are expected to be found here. That's why `expect` has been used
-				// instead of `filter_map`. If some traces haven't been found, it meens that
+				// instead of `filter_map`. If some traces haven't been found, it means that
 				// traces database is corrupted or incomplete.
-				.map(|block_hash| if block_hash == &request.block_hash {
+				.map(|block_hash|
+					if block_hash == &request.block_hash {
 						request.traces.bloom()
 					} else {
 						self.traces(block_hash).expect("Traces database is incomplete.").bloom()
-				})
+					}
+				)
 				.collect();
 
 			self.db.trace_blooms()
@@ -298,7 +300,8 @@ impl<T> TraceDatabase for TraceDB<T> where T: DatabaseExtras {
 					let tx_hash = self.extras.transaction_hash(block_number, tx_position)
 						.expect("Expected to find transaction hash. Database is probably corrupted");
 
-					traces.into_iter()
+					traces
+						.into_iter()
 						.map(|trace| LocalizedTrace {
 							action: trace.action,
 							result: trace.result,