ret err if context/params fails

http-client/src/client.rs

@@ -27,8 +27,8 @@ impl HttpClientBuilder {
 
 	/// Build the HTTP client with target to connect to.
 	pub fn build(self, target: impl AsRef<str>) -> Result<HttpClient, Error> {
-		let transport = HttpTransportClient::new(target, self.max_request_body_size)
-			.map_err(|e| Error::TransportError(Box::new(e)))?;
+		let transport =
+			HttpTransportClient::new(target, self.max_request_body_size).map_err(|e| Error::Transport(Box::new(e)))?;
 		Ok(HttpClient { transport, request_id: AtomicU64::new(0) })
 	}
 }
@@ -55,7 +55,7 @@ impl Client for HttpClient {
 		self.transport
 			.send(serde_json::to_string(&notif).map_err(Error::ParseError)?)
 			.await
-			.map_err(|e| Error::TransportError(Box::new(e)))
+			.map_err(|e| Error::Transport(Box::new(e)))
 	}
 
 	/// Perform a request towards the server.
@@ -71,7 +71,7 @@ impl Client for HttpClient {
 			.transport
 			.send_and_read_body(serde_json::to_string(&request).map_err(Error::ParseError)?)
 			.await
-			.map_err(|e| Error::TransportError(Box::new(e)))?;
+			.map_err(|e| Error::Transport(Box::new(e)))?;
 
 		let response: JsonRpcResponse<_> = match serde_json::from_slice(&body) {
 			Ok(response) => response,
@@ -110,7 +110,7 @@ impl Client for HttpClient {
 			.transport
 			.send_and_read_body(serde_json::to_string(&batch_request).map_err(Error::ParseError)?)
 			.await
-			.map_err(|e| Error::TransportError(Box::new(e)))?;
+			.map_err(|e| Error::Transport(Box::new(e)))?;
 
 		let rps: Vec<JsonRpcResponse<_>> = match serde_json::from_slice(&body) {
 			Ok(response) => response,

http-server/src/module.rs

@@ -1,5 +1,10 @@
-use jsonrpsee_types::{traits::RpcMethod, v2::params::RpcParams, Error};
-use jsonrpsee_utils::server::{send_response, Methods};
+use jsonrpsee_types::v2::error::{JsonRpcErrorCode, JsonRpcErrorObject};
+use jsonrpsee_types::{
+	error::{Error, InvalidParams, ServerCallError},
+	traits::RpcMethod,
+	v2::params::RpcParams,
+};
+use jsonrpsee_utils::server::{send_error, send_response, Methods};
 use serde::Serialize;
 use std::sync::Arc;
 
@@ -31,16 +36,17 @@ impl RpcModule {
 	pub fn register_method<F, R>(&mut self, method_name: &'static str, callback: F) -> Result<(), Error>
 	where
 		R: Serialize,
-		F: RpcMethod<R>,
+		F: RpcMethod<R, InvalidParams>,
 	{
 		self.verify_method_name(method_name)?;
 
 		self.methods.insert(
 			method_name,
 			Box::new(move |id, params, tx, _| {
-				let result = callback(params)?;
-
-				send_response(id, tx, result);
+				match callback(params) {
+					Ok(res) => send_response(id, tx, res),
+					Err(InvalidParams) => send_error(id, tx, JsonRpcErrorCode::InvalidParams.into()),
+				};
 
 				Ok(())
 			}),
@@ -82,7 +88,7 @@ impl<Context> RpcContextModule<Context> {
 	where
 		Context: Send + Sync + 'static,
 		R: Serialize,
-		F: Fn(RpcParams, &Context) -> Result<R, Error> + Send + Sync + 'static,
+		F: Fn(RpcParams, &Context) -> Result<R, ServerCallError> + Send + Sync + 'static,
 	{
 		self.module.verify_method_name(method_name)?;
 
@@ -91,10 +97,16 @@ impl<Context> RpcContextModule<Context> {
 		self.module.methods.insert(
 			method_name,
 			Box::new(move |id, params, tx, _| {
-				let result = callback(params, &*ctx)?;
-
-				send_response(id, tx, result);
-
+				match callback(params, &*ctx) {
+					Ok(res) => send_response(id, tx, res),
+					Err(ServerCallError::InvalidParams(_)) => {
+						send_error(id, tx, JsonRpcErrorCode::InvalidParams.into())
+					}
+					Err(ServerCallError::ContextFailed(err)) => {
+						let err = JsonRpcErrorObject { code: 1.into(), message: &err.to_string(), data: None };
+						send_error(id, tx, err)
+					}
+				};
 				Ok(())
 			}),
 		);

http-server/src/server.rs

@@ -36,7 +36,7 @@ use hyper::{
 	service::{make_service_fn, service_fn},
 	Error as HyperError,
 };
-use jsonrpsee_types::error::{Error, GenericTransportError};
+use jsonrpsee_types::error::{Error, GenericTransportError, InvalidParams};
 use jsonrpsee_types::v2::request::{JsonRpcInvalidRequest, JsonRpcRequest};
 use jsonrpsee_types::v2::{error::JsonRpcErrorCode, params::RpcParams};
 use jsonrpsee_utils::{hyper_helpers::read_response_to_body, server::send_error};
@@ -124,7 +124,7 @@ impl Server {
 	pub fn register_method<F, R>(&mut self, method_name: &'static str, callback: F) -> Result<(), Error>
 	where
 		R: Serialize,
-		F: Fn(RpcParams) -> Result<R, Error> + Send + Sync + 'static,
+		F: Fn(RpcParams) -> Result<R, InvalidParams> + Send + Sync + 'static,
 	{
 		self.root.register_method(method_name, callback)
 	}

http-server/src/tests.rs

@@ -42,14 +42,23 @@ async fn single_method_call_with_params() {
 	let addr = server().await;
 	let uri = to_http_uri(addr);
 
-	std::thread::sleep(std::time::Duration::from_secs(2));
-
 	let req = r#"{"jsonrpc":"2.0","method":"add", "params":[1, 2],"id":1}"#;
 	let response = http_request(req.into(), uri).await.unwrap();
 	assert_eq!(response.status, StatusCode::OK);
 	assert_eq!(response.body, ok_response(JsonValue::Number(3.into()), Id::Num(1)));
 }
 
+#[tokio::test]
+async fn single_method_call_with_faulty_params_returns_err() {
+	let addr = server().await;
+	let uri = to_http_uri(addr);
+
+	let req = r#"{"jsonrpc":"2.0","method":"add", "params":["Invalid"],"id":1}"#;
+	let response = http_request(req.into(), uri).await.unwrap();
+	assert_eq!(response.status, StatusCode::OK);
+	assert_eq!(response.body, invalid_params(Id::Num(1)));
+}
+
 #[tokio::test]
 async fn should_return_method_not_found() {
 	let addr = server().await;

tests/tests/integration_tests.rs

@@ -203,14 +203,14 @@ async fn wss_works() {
 #[tokio::test]
 async fn ws_with_non_ascii_url_doesnt_hang_or_panic() {
 	let err = WsClientBuilder::default().build("wss://♥♥♥♥♥♥∀∂").await;
-	assert!(matches!(err, Err(Error::TransportError(_))));
+	assert!(matches!(err, Err(Error::Transport(_))));
 }
 
 #[tokio::test]
 async fn http_with_non_ascii_url_doesnt_hang_or_panic() {
 	let client = HttpClientBuilder::default().build("http://♥♥♥♥♥♥∀∂").unwrap();
 	let err: Result<(), Error> = client.request("system_chain", JsonRpcParams::NoParams).await;
-	assert!(matches!(err, Err(Error::TransportError(_))));
+	assert!(matches!(err, Err(Error::Transport(_))));
 }
 
 #[tokio::test]

types/src/error.rs

@@ -16,12 +16,37 @@ impl<T: fmt::Display> fmt::Display for Mismatch<T> {
 	}
 }
 
+/// Invalid params.
+#[derive(Debug)]
+pub struct InvalidParams;
+
+/// Error that may occur when a server fails to execute provided closure/callback.
+#[derive(Debug, thiserror::Error)]
+pub enum ServerCallError {
+	#[error("Invalid params in the RPC call")]
+	/// InvalidParams,
+	InvalidParams(InvalidParams),
+	#[error("Provided context failed: {0}")]
+	/// Provided context/metadata failed.
+	ContextFailed(#[source] Box<dyn std::error::Error + Send + Sync>),
+}
+
+impl From<InvalidParams> for ServerCallError {
+	fn from(params: InvalidParams) -> Self {
+		Self::InvalidParams(params)
+	}
+}
+
 /// Error type.
 #[derive(Debug, thiserror::Error)]
 pub enum Error {
+	/// Error that may occur when a server fails to execute provided closure/callback.
+	/// Note, will most likely imply that the JSON-RPC request was valid.
+	#[error("Server call failed: {0}")]
+	ServerCall(ServerCallError),
 	/// Networking error or error on the low-level protocol layer.
 	#[error("Networking or low-level protocol error: {0}")]
-	TransportError(#[source] Box<dyn std::error::Error + Send + Sync>),
+	Transport(#[source] Box<dyn std::error::Error + Send + Sync>),
 	/// JSON-RPC request error.
 	#[error("JSON-RPC request error: {0:?}")]
 	Request(#[source] JsonRpcErrorAlloc),
@@ -34,7 +59,7 @@ pub enum Error {
 	/// The background task has been terminated.
 	#[error("The background task been terminated because: {0}; restart required")]
 	RestartNeeded(String),
-	/// Failed to parse the data that the server sent back to us.
+	/// Failed to parse the data.
 	#[error("Parse error: {0}")]
 	ParseError(#[source] serde_json::Error),
 	/// Invalid subscription ID.

types/src/traits.rs

@@ -47,6 +47,6 @@ pub trait SubscriptionClient: Client {
 }
 
 /// JSON-RPC server interface for managing method calls.
-pub trait RpcMethod<R>: Fn(RpcParams) -> Result<R, Error> + Send + Sync + 'static {}
+pub trait RpcMethod<R, E>: Fn(RpcParams) -> Result<R, E> + Send + Sync + 'static {}
 
-impl<R, T> RpcMethod<R> for T where T: Fn(RpcParams) -> Result<R, Error> + Send + Sync + 'static {}
+impl<R, T, E> RpcMethod<R, E> for T where T: Fn(RpcParams) -> Result<R, E> + Send + Sync + 'static {}

types/src/v2/mod.rs

@@ -1,4 +1,4 @@
-use crate::Error;
+use crate::error::Error;
 use serde::de::DeserializeOwned;
 use serde_json::value::RawValue;
 
@@ -12,11 +12,11 @@ pub mod request;
 pub mod response;
 
 /// Parse request ID from RawValue.
-pub fn parse_request_id<T: DeserializeOwned>(raw: Option<&RawValue>) -> Result<T, crate::Error> {
+pub fn parse_request_id<T: DeserializeOwned>(raw: Option<&RawValue>) -> Result<T, Error> {
 	match raw {
 		None => Err(Error::InvalidRequestId),
 		Some(v) => {
-			let val = serde_json::from_str(v.get()).map_err(Error::ParseError)?;
+			let val = serde_json::from_str(v.get()).map_err(|_| Error::InvalidRequestId)?;
 			Ok(val)
 		}
 	}

types/src/v2/params.rs

@@ -1,4 +1,4 @@
-use crate::error::Error;
+use crate::error::InvalidParams;
 use alloc::collections::BTreeMap;
 use serde::de::{self, Deserializer, Unexpected, Visitor};
 use serde::ser::Serializer;
@@ -78,18 +78,18 @@ impl<'a> RpcParams<'a> {
 	}
 
 	/// Attempt to parse all parameters as array or map into type T
-	pub fn parse<T>(self) -> Result<T, Error>
+	pub fn parse<T>(self) -> Result<T, InvalidParams>
 	where
 		T: Deserialize<'a>,
 	{
 		match self.0 {
-			None => Err(Error::InvalidParams),
-			Some(params) => serde_json::from_str(params).map_err(|_| Error::InvalidParams),
+			None => Err(InvalidParams),
+			Some(params) => serde_json::from_str(params).map_err(|_| InvalidParams),
 		}
 	}
 
 	/// Attempt to parse only the first parameter from an array into type T
-	pub fn one<T>(self) -> Result<T, Error>
+	pub fn one<T>(self) -> Result<T, InvalidParams>
 	where
 		T: Deserialize<'a>,
 	{

ws-client/src/client.rs

@@ -253,7 +253,7 @@ impl<'a> WsClientBuilder<'a> {
 		let (to_back, from_front) = mpsc::channel(self.max_concurrent_requests);
 		let (err_tx, err_rx) = oneshot::channel();
 
-		let (sockaddrs, host, mode) = parse_url(url).map_err(|e| Error::TransportError(Box::new(e)))?;
+		let (sockaddrs, host, mode) = parse_url(url).map_err(|e| Error::Transport(Box::new(e)))?;
 
 		let builder = WsTransportClientBuilder {
 			sockaddrs,
@@ -265,7 +265,7 @@ impl<'a> WsClientBuilder<'a> {
 			max_request_body_size: self.max_request_body_size,
 		};
 
-		let (sender, receiver) = builder.build().await.map_err(|e| Error::TransportError(Box::new(e)))?;
+		let (sender, receiver) = builder.build().await.map_err(|e| Error::Transport(Box::new(e)))?;
 
 		async_std::task::spawn(async move {
 			background_task(sender, receiver, from_front, err_tx, max_capacity_per_subscription).await;
@@ -518,7 +518,7 @@ async fn background_task(
 						.expect("ID unused checked above; qed"),
 					Err(e) => {
 						log::warn!("[backend]: client request failed: {:?}", e);
-						let _ = request.send_back.map(|s| s.send(Err(Error::TransportError(Box::new(e)))));
+						let _ = request.send_back.map(|s| s.send(Err(Error::Transport(Box::new(e)))));
 					}
 				}
 			}
@@ -535,7 +535,7 @@ async fn background_task(
 					.expect("Request ID unused checked above; qed"),
 				Err(e) => {
 					log::warn!("[backend]: client subscription failed: {:?}", e);
-					let _ = sub.send_back.send(Err(Error::TransportError(Box::new(e))));
+					let _ = sub.send_back.send(Err(Error::Transport(Box::new(e))));
 				}
 			},
 			// User dropped a subscription.
@@ -600,7 +600,7 @@ async fn background_task(
 			}
 			Either::Right((Some(Err(e)), _)) => {
 				log::error!("Error: {:?} terminating client", e);
-				let _ = front_error.send(Error::TransportError(Box::new(e)));
+				let _ = front_error.send(Error::Transport(Box::new(e)));
 				return;
 			}
 			Either::Right((None, _)) => {

ws-server/Cargo.toml

@@ -11,6 +11,7 @@ documentation = "https://docs.rs/jsonrpsee-ws-server"
 
 [dependencies]
 anyhow = "1.0.34"
+env_logger = "0.8"
 futures-channel = "0.3"
 futures-util = { version = "0.3", default-features = false, features = ["io"] }
 jsonrpsee-types = { path = "../types", version = "0.2.0-alpha.6" }

ws-server/src/server.rs

@@ -37,7 +37,7 @@ use tokio::net::{TcpListener, ToSocketAddrs};
 use tokio_stream::{wrappers::TcpListenerStream, StreamExt};
 use tokio_util::compat::TokioAsyncReadCompatExt;
 
-use jsonrpsee_types::error::Error;
+use jsonrpsee_types::error::{Error, InvalidParams};
 use jsonrpsee_types::v2::error::JsonRpcErrorCode;
 use jsonrpsee_types::v2::params::{JsonRpcNotificationParams, RpcParams, TwoPointZero};
 use jsonrpsee_types::v2::request::{JsonRpcInvalidRequest, JsonRpcNotification, JsonRpcRequest};
@@ -105,7 +105,7 @@ impl Server {
 	pub fn register_method<F, R>(&mut self, method_name: &'static str, callback: F) -> Result<(), Error>
 	where
 		R: Serialize,
-		F: Fn(RpcParams) -> Result<R, Error> + Send + Sync + 'static,
+		F: Fn(RpcParams) -> Result<R, InvalidParams> + Send + Sync + 'static,
 	{
 		self.root.register_method(method_name, callback)
 	}