evmbin: Fix gas_used issue in state root mismatch and handle output better

evmbin/src/display/std_json.rs

@@ -28,44 +28,60 @@ use info as vm;
 
 pub trait Writer: io::Write + Send + Sized {
 	fn clone(&self) -> Self;
+	fn default() -> Self;
 }
 
 impl Writer for io::Stdout {
 	fn clone(&self) -> Self {
 		io::stdout()
 	}
+
+	fn default() -> Self {
+		io::stdout()
+	}
+}
+
+impl Writer for io::Stderr {
+	fn clone(&self) -> Self {
+		io::stderr()
+	}
+
+	fn default() -> Self {
+		io::stderr()
+	}
 }
 
 /// JSON formatting informant.
-pub struct Informant<T: Writer = io::Stdout> {
+pub struct Informant<Trace = io::Stderr, Out = io::Stdout> {
 	code: Vec<u8>,
 	instruction: u8,
 	depth: usize,
 	stack: Vec<U256>,
 	storage: HashMap<H256, H256>,
-	sink: T,
+	trace_sink: Trace,
+	out_sink: Out,
 }
 
 impl Default for Informant {
 	fn default() -> Self {
-		Self::new(io::stdout())
+		Self::new(io::stderr(), io::stdout())
 	}
 }
 
-impl<T: Writer> Informant<T> {
-	pub fn new(sink: T) -> Self {
+impl<Trace: Writer, Out: Writer> Informant<Trace, Out> {
+	pub fn new(trace_sink: Trace, out_sink: Out) -> Self {
 		Informant {
 			code: Default::default(),
 			instruction: Default::default(),
 			depth: Default::default(),
 			stack: Default::default(),
 			storage: Default::default(),
-			sink,
+			trace_sink, out_sink
 		}
 	}
 }
 
-impl<T: Writer> Informant<T> {
+impl<Trace: Writer, Out: Writer> Informant<Trace, Out> {
 	fn stack(&self) -> String {
 		let items = self.stack.iter().map(|i| format!("\"0x{:x}\"", i)).collect::<Vec<_>>();
 		format!("[{}]", items.join(","))
@@ -79,10 +95,10 @@ impl<T: Writer> Informant<T> {
 	}
 }
 
-impl<T: Writer> vm::Informant for Informant<T> {
+impl<Trace: Writer, Out: Writer> vm::Informant for Informant<Trace, Out> {
 	fn before_test(&mut self, name: &str, action: &str) {
 		writeln!(
-			&mut self.sink,
+			&mut self.out_sink,
 			"{{\"test\":\"{name}\",\"action\":\"{action}\"}}",
 			name = name,
 			action = action,
@@ -91,30 +107,38 @@ impl<T: Writer> vm::Informant for Informant<T> {
 
 	fn set_gas(&mut self, _gas: U256) {}
 
-	fn finish(result: vm::RunResult<Self::Output>) {
+	fn finish(result: vm::RunResult<<Self as trace::VMTracer>::Output>) {
+		let mut trace_sink = Trace::default();
+		let mut out_sink = Out::default();
+
 		match result {
 			Ok(success) => {
-				println!("{{\"stateRoot\":\"{:?}\"}}", success.state_root);
-				println!(
-					"{{\"output\":\"0x{output}\",\"gasUsed\":\"{gas:x}\",\"time\":{time}}}",
+				writeln!(
+					&mut trace_sink,
+					"{{\"stateRoot\":\"{:?}\"}}", success.state_root
+				).expect("The sink must be writeable.");
+				writeln!(
+					&mut out_sink,
+					"{{\"output\":\"0x{output}\",\"gasUsed\":\"0x{gas:x}\",\"time\":{time}}}",
 					output = success.output.to_hex(),
 					gas = success.gas_used,
 					time = display::as_micros(&success.time),
-				);
+				).expect("The sink must be writeable.");
 			},
 			Err(failure) => {
-				println!(
-					"{{\"error\":\"{error}\",\"gasUsed\":\"{gas:x}\",\"time\":{time}}}",
+				writeln!(
+					&mut out_sink,
+					"{{\"error\":\"{error}\",\"gasUsed\":\"0x{gas:x}\",\"time\":{time}}}",
 					error = failure.error,
 					gas = failure.gas_used,
 					time = display::as_micros(&failure.time),
-				)
+				).expect("The sink must be writeable.");
 			},
 		}
 	}
 }
 
-impl<T: Writer> trace::VMTracer for Informant<T> {
+impl<Trace: Writer, Out: Writer> trace::VMTracer for Informant<Trace, Out> {
 	type Output = ();
 
 	fn trace_next_instruction(&mut self, pc: usize, instruction: u8, current_gas: U256) -> bool {
@@ -124,7 +148,7 @@ impl<T: Writer> trace::VMTracer for Informant<T> {
 		let stack = self.stack();
 
 		writeln!(
-			&mut self.sink,
+			&mut self.trace_sink,
 			"{{\"pc\":{pc},\"op\":{op},\"opName\":\"{name}\",\"gas\":\"0x{gas:x}\",\"stack\":{stack},\"storage\":{storage},\"depth\":{depth}}}",
 			pc = pc,
 			op = instruction,
@@ -155,7 +179,7 @@ impl<T: Writer> trace::VMTracer for Informant<T> {
 	}
 
 	fn prepare_subtrace(&self, code: &[u8]) -> Self where Self: Sized {
-		let mut vm = Informant::new(self.sink.clone());
+		let mut vm = Informant::new(self.trace_sink.clone(), self.out_sink.clone());
 		vm.depth = self.depth + 1;
 		vm.code = code.to_vec();
 		vm
@@ -177,6 +201,7 @@ pub mod tests {
 
 	impl Writer for TestWriter {
 		fn clone(&self) -> Self { Clone::clone(self) }
+		fn default() -> Self { Default::default() }
 	}
 
 	impl io::Write for TestWriter {
@@ -189,10 +214,11 @@ pub mod tests {
 		}
 	}
 
-	pub fn informant() -> (Informant<TestWriter>, Arc<Mutex<Vec<u8>>>) {
-		let writer = TestWriter::default();
-		let res = writer.0.clone();
-		(Informant::new(writer), res)
+	pub fn informant() -> (Informant<TestWriter, TestWriter>, Arc<Mutex<Vec<u8>>>) {
+		let trace_writer: TestWriter = Default::default();
+		let out_writer: TestWriter = Default::default();
+		let res = trace_writer.0.clone();
+		(Informant::new(trace_writer, out_writer), res)
 	}
 
 	#[test]

evmbin/src/info.rs

@@ -81,10 +81,11 @@ pub fn run_action<T: Informant>(
 		}
 	}
 	run(spec, params.gas, spec.genesis_state(), |mut client| {
-		let result = client
-			.call(params, &mut trace::NoopTracer, &mut informant)
-			.map(|r| (0.into(), r.gas_left, r.return_data.to_vec()));
-		(result, informant.drain())
+		let result = match client.call(params, &mut trace::NoopTracer, &mut informant) {
+			Ok(r) => (Ok((0.into(), r.return_data.to_vec())), Some(r.gas_left)),
+			Err(err) => (Err(err), None),
+		};
+		(result.0, result.1, informant.drain())
 	})
 }
 
@@ -116,20 +117,20 @@ pub fn run_transaction<T: Informant>(
 	let result = run(&spec, env_info.gas_limit, pre_state, |mut client| {
 		let result = client.transact(env_info, transaction, trace::NoopTracer, informant);
 		match result {
-			TransactResult::Ok { state_root, .. } if state_root != post_root => {
+			TransactResult::Ok { state_root, gas_left, .. } if state_root != post_root => {
 				(Err(EvmTestError::PostCondition(format!(
-					"State root mismatch (got: {}, expected: {})",
+					"State root mismatch (got: 0x{:x}, expected: 0x{:x})",
 					state_root,
 					post_root,
-				))), None)
+				))), Some(gas_left), None)
 			},
 			TransactResult::Ok { state_root, gas_left, output, vm_trace, .. } => {
-				(Ok((state_root, gas_left, output)), vm_trace)
+				(Ok((state_root, output)), Some(gas_left), vm_trace)
 			},
 			TransactResult::Err { error, .. } => {
 				(Err(EvmTestError::PostCondition(format!(
 					"Unexpected execution error: {:?}", error
-				))), None)
+				))), None, None)
 			},
 		}
 	});
@@ -144,7 +145,7 @@ pub fn run<'a, F, X>(
 	pre_state: &'a pod_state::PodState,
 	run: F,
 ) -> RunResult<X> where
-	F: FnOnce(EvmTestClient) -> (Result<(H256, U256, Vec<u8>), EvmTestError>, Option<X>),
+	F: FnOnce(EvmTestClient) -> (Result<(H256, Vec<u8>), EvmTestError>, Option<U256>, Option<X>),
 {
 	let test_client = EvmTestClient::from_pod_state(spec, pre_state.clone())
 		.map_err(|error| Failure {
@@ -159,15 +160,15 @@ pub fn run<'a, F, X>(
 	let time = start.elapsed();
 
 	match result {
-		(Ok((state_root, gas_left, output)), traces) => Ok(Success {
+		(Ok((state_root, output)), gas_left, traces) => Ok(Success {
 			state_root,
-			gas_used: initial_gas - gas_left,
+			gas_used: gas_left.map(|gas_left| initial_gas - gas_left).unwrap_or(initial_gas),
 			output,
 			time,
 			traces,
 		}),
-		(Err(error), traces) => Err(Failure {
-			gas_used: initial_gas,
+		(Err(error), gas_left, traces) => Err(Failure {
+			gas_used: gas_left.map(|gas_left| initial_gas - gas_left).unwrap_or(initial_gas),
 			error,
 			time,
 			traces,