facelift for traces, added errors (#2042)

* evm errors facelift

* facelift for traces, added errors with description

* additional tests for traces json serialization

ethcore/src/trace/db.rs

@@ -420,7 +420,7 @@ mod tests {
 	use devtools::RandomTempPath;
 	use header::BlockNumber;
 	use trace::{Config, Switch, TraceDB, Database as TraceDatabase, DatabaseExtras, ImportRequest};
-	use trace::{Filter, LocalizedTrace, AddressesFilter};
+	use trace::{Filter, LocalizedTrace, AddressesFilter, TraceError};
 	use trace::trace::{Call, Action, Res};
 	use trace::flat::{FlatTrace, FlatBlockTraces, FlatTransactionTraces};
 	use types::executed::CallType;
@@ -560,7 +560,7 @@ mod tests {
 					input: vec![],
 					call_type: CallType::Call,
 				}),
-				result: Res::FailedCall,
+				result: Res::FailedCall(TraceError::OutOfGas),
 			}])]),
 			block_hash: block_hash.clone(),
 			block_number: block_number,
@@ -579,7 +579,7 @@ mod tests {
 				input: vec![],
 				call_type: CallType::Call,
 			}),
-			result: Res::FailedCall,
+			result: Res::FailedCall(TraceError::OutOfGas),
 			trace_address: vec![],
 			subtraces: 0,
 			transaction_number: 0,

ethcore/src/trace/executive_tracer.rs

@@ -19,7 +19,7 @@
 use util::{Bytes, Address, U256};
 use action_params::ActionParams;
 use trace::trace::{Call, Create, Action, Res, CreateResult, CallResult, VMTrace, VMOperation, VMExecutedOperation, MemoryDiff, StorageDiff, Suicide};
-use trace::{Tracer, VMTracer, FlatTrace};
+use trace::{Tracer, VMTracer, FlatTrace, TraceError};
 
 /// Simple executive tracer. Traces all calls and creates. Ignores delegatecalls.
 #[derive(Default)]
@@ -112,23 +112,23 @@ impl Tracer for ExecutiveTracer {
 		self.traces.extend(update_trace_address(subs));
 	}
 
-	fn trace_failed_call(&mut self, call: Option<Call>, subs: Vec<FlatTrace>) {
+	fn trace_failed_call(&mut self, call: Option<Call>, subs: Vec<FlatTrace>, error: TraceError) {
 		let trace = FlatTrace {
 			trace_address: Default::default(),
 			subtraces: top_level_subtraces(&subs),
 			action: Action::Call(call.expect("self.prepare_trace_call().is_some(): so we must be tracing: qed")),
-			result: Res::FailedCall,
+			result: Res::FailedCall(error),
 		};
 		debug!(target: "trace", "Traced failed call {:?}", trace);
 		self.traces.push(trace);
 		self.traces.extend(update_trace_address(subs));
 	}
 
-	fn trace_failed_create(&mut self, create: Option<Create>, subs: Vec<FlatTrace>) {
+	fn trace_failed_create(&mut self, create: Option<Create>, subs: Vec<FlatTrace>, error: TraceError) {
 		let trace = FlatTrace {
 			subtraces: top_level_subtraces(&subs),
 			action: Action::Create(create.expect("self.prepare_trace_create().is_some(): so we must be tracing: qed")),
-			result: Res::FailedCreate,
+			result: Res::FailedCreate(error),
 			trace_address: Default::default(),
 		};
 		debug!(target: "trace", "Traced failed create {:?}", trace);

ethcore/src/trace/mod.rs

@@ -24,7 +24,8 @@ mod executive_tracer;
 mod import;
 mod noop_tracer;
 
-pub use types::trace_types::*;
+pub use types::trace_types::{filter, flat, localized, trace};
+pub use types::trace_types::error::Error as TraceError;
 pub use self::config::{Config, Switch};
 pub use self::db::TraceDB;
 pub use self::error::Error;
@@ -71,10 +72,10 @@ pub trait Tracer: Send {
 	);
 
 	/// Stores failed call trace.
-	fn trace_failed_call(&mut self, call: Option<Call>, subs: Vec<FlatTrace>);
+	fn trace_failed_call(&mut self, call: Option<Call>, subs: Vec<FlatTrace>, error: TraceError);
 
 	/// Stores failed create trace.
-	fn trace_failed_create(&mut self, create: Option<Create>, subs: Vec<FlatTrace>);
+	fn trace_failed_create(&mut self, create: Option<Create>, subs: Vec<FlatTrace>, error: TraceError);
 
 	/// Stores suicide info.
 	fn trace_suicide(&mut self, address: Address, balance: U256, refund_address: Address);

ethcore/src/trace/noop_tracer.rs

@@ -18,7 +18,7 @@
 
 use util::{Bytes, Address, U256};
 use action_params::ActionParams;
-use trace::{Tracer, VMTracer, FlatTrace};
+use trace::{Tracer, VMTracer, FlatTrace, TraceError};
 use trace::trace::{Call, Create, VMTrace};
 
 /// Nonoperative tracer. Does not trace anything.
@@ -47,11 +47,11 @@ impl Tracer for NoopTracer {
 		assert!(code.is_none(), "self.prepare_trace_output().is_none(): so we can't be tracing: qed");
 	}
 
-	fn trace_failed_call(&mut self, call: Option<Call>, _: Vec<FlatTrace>) {
+	fn trace_failed_call(&mut self, call: Option<Call>, _: Vec<FlatTrace>, _: TraceError) {
 		assert!(call.is_none(), "self.prepare_trace_call().is_none(): so we can't be tracing: qed");
 	}
 
-	fn trace_failed_create(&mut self, create: Option<Create>, _: Vec<FlatTrace>) {
+	fn trace_failed_create(&mut self, create: Option<Create>, _: Vec<FlatTrace>, _: TraceError) {
 		assert!(create.is_none(), "self.prepare_trace_create().is_none(): so we can't be tracing: qed");
 	}