[proc macros] force proc macro api to return Result

benches/helpers.rs

@@ -2,6 +2,7 @@ use futures_channel::oneshot;
 use futures_util::future::FutureExt;
 use jsonrpsee::{
 	http_server::HttpServerBuilder,
+	types::Error,
 	ws_server::{RpcModule, WsServerBuilder},
 };
 
@@ -17,8 +18,8 @@ pub async fn http_server() -> String {
 		let server =
 			HttpServerBuilder::default().max_request_body_size(u32::MAX).build("127.0.0.1:0".parse().unwrap()).unwrap();
 		let mut module = RpcModule::new(());
-		module.register_method(SYNC_METHOD_NAME, |_, _| Ok("lo")).unwrap();
-		module.register_async_method(ASYNC_METHOD_NAME, |_, _| (async { Ok("lo") }).boxed()).unwrap();
+		module.register_method::<_, _, Error>(SYNC_METHOD_NAME, |_, _| Ok("lo")).unwrap();
+		module.register_async_method::<_, _, Error>(ASYNC_METHOD_NAME, |_, _| (async { Ok("lo") }).boxed()).unwrap();
 		server_started_tx.send(server.local_addr().unwrap()).unwrap();
 		server.start(module).await
 	});
@@ -31,8 +32,8 @@ pub async fn ws_server() -> String {
 	tokio::spawn(async move {
 		let server = WsServerBuilder::default().build("127.0.0.1:0").await.unwrap();
 		let mut module = RpcModule::new(());
-		module.register_method(SYNC_METHOD_NAME, |_, _| Ok("lo")).unwrap();
-		module.register_async_method(ASYNC_METHOD_NAME, |_, _| (async { Ok("lo") }).boxed()).unwrap();
+		module.register_method::<_, _, Error>(SYNC_METHOD_NAME, |_, _| Ok("lo")).unwrap();
+		module.register_async_method::<_, _, Error>(ASYNC_METHOD_NAME, |_, _| (async { Ok("lo") }).boxed()).unwrap();
 		module
 			.register_subscription(SUB_METHOD_NAME, UNSUB_METHOD_NAME, |_params, mut sink, _ctx| {
 				let x = "Hello";

examples/http.rs

@@ -27,6 +27,7 @@
 use jsonrpsee::{
 	http_client::HttpClientBuilder,
 	http_server::{HttpServerBuilder, RpcModule},
+	types::Error,
 	types::{traits::Client, JsonValue},
 };
 use std::net::SocketAddr;
@@ -50,7 +51,7 @@ async fn main() -> anyhow::Result<()> {
 async fn run_server() -> anyhow::Result<SocketAddr> {
 	let server = HttpServerBuilder::default().build("127.0.0.1:0".parse()?)?;
 	let mut module = RpcModule::new(());
-	module.register_method("say_hello", |_, _| Ok("lo"))?;
+	module.register_method::<_, _, Error>("say_hello", |_, _| Ok("lo"))?;
 
 	let addr = server.local_addr()?;
 	tokio::spawn(server.start(module));

examples/proc_macro.rs

@@ -26,17 +26,17 @@
 
 use jsonrpsee::{
 	proc_macros::rpc,
-	types::async_trait,
+	types::{async_trait, error::Error},
 	ws_client::WsClientBuilder,
 	ws_server::{RpcModule, SubscriptionSink, WsServerBuilder},
 };
 use std::net::SocketAddr;
 
-#[rpc(client, server, namespace = "state")]
+#[rpc(server, client, namespace = "state")]
 pub trait Rpc {
 	/// Async method call example.
 	#[method(name = "getPairs")]
-	async fn storage_pairs(&self, prefix: usize, hash: Option<u128>) -> Vec<usize>;
+	async fn storage_pairs(&self, prefix: usize, hash: Option<u128>) -> Result<Vec<usize>, Error>;
 
 	/// Subscription that take `Option<Vec<u8>>` as input and produces output `Vec<usize>`.
 	#[subscription(name = "subscribeStorage", unsub = "unsubscribeStorage", item = Vec<usize>)]
@@ -47,8 +47,8 @@ pub struct RpcServerImpl;
 
 #[async_trait]
 impl RpcServer for RpcServerImpl {
-	async fn storage_pairs(&self, _prefix: usize, _hash: Option<u128>) -> Vec<usize> {
-		vec![1, 2, 3, 4]
+	async fn storage_pairs(&self, _prefix: usize, _hash: Option<u128>) -> Result<Vec<usize>, Error> {
+		Ok(vec![1, 2, 3, 4])
 	}
 
 	fn subscribe_storage(&self, mut sink: SubscriptionSink, keys: Option<Vec<u8>>) {
@@ -75,7 +75,7 @@ async fn main() -> anyhow::Result<()> {
 async fn run_server() -> anyhow::Result<SocketAddr> {
 	let server = WsServerBuilder::default().build("127.0.0.1:0").await?;
 	let mut module = RpcModule::new(());
-	module.register_method("state_getPairs", |_, _| Ok(vec![1, 2, 3]))?;
+	module.register_method::<_, _, Error>("state_getPairs", |_, _| Ok(vec![1, 2, 3]))?;
 
 	let addr = server.local_addr()?;
 	tokio::spawn(async move { server.start(RpcServerImpl.into_rpc()).await });

examples/ws.rs

@@ -25,7 +25,7 @@
 // DEALINGS IN THE SOFTWARE.
 
 use jsonrpsee::{
-	types::{traits::Client, v2::params::JsonRpcParams},
+	types::{traits::Client, v2::params::JsonRpcParams, Error},
 	ws_client::WsClientBuilder,
 	ws_server::{RpcModule, WsServerBuilder},
 };
@@ -47,7 +47,7 @@ async fn main() -> anyhow::Result<()> {
 async fn run_server() -> anyhow::Result<SocketAddr> {
 	let server = WsServerBuilder::default().build("127.0.0.1:0").await?;
 	let mut module = RpcModule::new(());
-	module.register_method("say_hello", |_, _| Ok("lo"))?;
+	module.register_method::<_, _, Error>("say_hello", |_, _| Ok("lo"))?;
 	let addr = server.local_addr()?;
 	tokio::spawn(server.start(module));
 	Ok(addr)

http-server/src/tests.rs

@@ -47,38 +47,38 @@ async fn server_with_handles() -> (SocketAddr, JoinHandle<Result<(), Error>>, St
 	let ctx = TestContext;
 	let mut module = RpcModule::new(ctx);
 	let addr = server.local_addr().unwrap();
-	module.register_method("say_hello", |_, _| Ok("lo")).unwrap();
-	module.register_async_method("say_hello_async", |_, _| async move { Ok("lo") }.boxed()).unwrap();
+	module.register_method::<_, _, Error>("say_hello", |_, _| Ok("lo")).unwrap();
+	module.register_async_method::<_, _, Error>("say_hello_async", |_, _| async move { Ok("lo") }.boxed()).unwrap();
 	module
-		.register_method("add", |params, _| {
+		.register_method::<_, _, Error>("add", |params, _| {
 			let params: Vec<u64> = params.parse()?;
 			let sum: u64 = params.into_iter().sum();
 			Ok(sum)
 		})
 		.unwrap();
 	module
-		.register_method("multiparam", |params, _| {
+		.register_method::<_, _, Error>("multiparam", |params, _| {
 			let params: (String, String, Vec<u8>) = params.parse()?;
 			let r = format!("string1={}, string2={}, vec={}", params.0.len(), params.1.len(), params.2.len());
 			Ok(r)
 		})
 		.unwrap();
-	module.register_method("notif", |_, _| Ok("")).unwrap();
+	module.register_method::<_, _, Error>("notif", |_, _| Ok("")).unwrap();
 	module
-		.register_method("should_err", |_, ctx| {
+		.register_method::<_, _, Error>("should_err", |_, ctx| {
 			let _ = ctx.err().map_err(|e| CallError::Failed(e.into()))?;
 			Ok("err")
 		})
 		.unwrap();
 
 	module
-		.register_method("should_ok", |_, ctx| {
+		.register_method::<_, _, Error>("should_ok", |_, ctx| {
 			let _ = ctx.ok().map_err(|e| CallError::Failed(e.into()))?;
 			Ok("ok")
 		})
 		.unwrap();
 	module
-		.register_async_method("should_ok_async", |_p, ctx| {
+		.register_async_method::<_, _, Error>("should_ok_async", |_p, ctx| {
 			async move {
 				let _ = ctx.ok().map_err(|e| CallError::Failed(e.into()))?;
 				Ok("ok")
@@ -369,12 +369,12 @@ async fn can_register_modules() {
 	let mut mod2 = RpcModule::new(cx2);
 
 	assert_eq!(mod1.method_names().count(), 0);
-	mod1.register_method("bla", |_, cx| Ok(format!("Gave me {}", cx))).unwrap();
-	mod1.register_method("bla2", |_, cx| Ok(format!("Gave me {}", cx))).unwrap();
-	mod2.register_method("yada", |_, cx| Ok(format!("Gave me {:?}", cx))).unwrap();
+	mod1.register_method::<_, _, Error>("bla", |_, cx| Ok(format!("Gave me {}", cx))).unwrap();
+	mod1.register_method::<_, _, Error>("bla2", |_, cx| Ok(format!("Gave me {}", cx))).unwrap();
+	mod2.register_method::<_, _, Error>("yada", |_, cx| Ok(format!("Gave me {:?}", cx))).unwrap();
 
 	// Won't register, name clashes
-	mod2.register_method("bla", |_, cx| Ok(format!("Gave me {:?}", cx))).unwrap();
+	mod2.register_method::<_, _, Error>("bla", |_, cx| Ok(format!("Gave me {:?}", cx))).unwrap();
 
 	assert_eq!(mod1.method_names().count(), 2);
 

proc-macros/src/lib.rs

@@ -198,16 +198,16 @@ mod new;
 ///
 /// // RPC is moved into a separate module to clearly show names of generated entities.
 /// mod rpc_impl {
-///     use jsonrpsee::{proc_macros::rpc, types::async_trait, ws_server::SubscriptionSink};
+///     use jsonrpsee::{proc_macros::rpc, types::{async_trait, JsonRpcResult}, ws_server::SubscriptionSink};
 ///
 ///     // Generate both server and client implementations, prepend all the methods with `foo_` prefix.
 ///     #[rpc(client, server, namespace = "foo")]
 ///     pub trait Rpc {
 ///         #[method(name = "foo")]
-///         async fn async_method(&self, param_a: u8, param_b: String) -> u16;
+///         async fn async_method(&self, param_a: u8, param_b: String) -> JsonRpcResult<u16>;
 ///
 ///         #[method(name = "bar")]
-///         fn sync_method(&self) -> u16;
+///         fn sync_method(&self) -> JsonRpcResult<u16>;
 ///
 ///         #[subscription(name = "sub", unsub = "unsub", item = String)]
 ///         fn sub(&self);
@@ -220,12 +220,12 @@ mod new;
 ///     // Note that the trait name we use is `RpcServer`, not `Rpc`!
 ///     #[async_trait]
 ///     impl RpcServer for RpcServerImpl {
-///         async fn async_method(&self, _param_a: u8, _param_b: String) -> u16 {
-///             42u16
+///         async fn async_method(&self, _param_a: u8, _param_b: String) -> JsonRpcResult<u16> {
+///             Ok(42u16)
 ///         }
 ///
-///         fn sync_method(&self) -> u16 {
-///             10u16
+///         fn sync_method(&self) -> JsonRpcResult<u16> {
+///             Ok(10u16)
 ///         }
 ///
 ///         // We could've spawned a `tokio` future that yields values while our program works,

proc-macros/src/new/render_client.rs

@@ -52,7 +52,7 @@ impl RpcDescription {
 		// `returns` represent the return type of the *rust method* (`Result< <..>, jsonrpsee::Error`).
 		let (called_method, returns) = if let Some(returns) = &method.returns {
 			let called_method = quote::format_ident!("request");
-			let returns = quote! { Result<#returns, #jrps_error> };
+			let returns = quote! { #returns };
 
 			(called_method, returns)
 		} else {

proc-macros/src/new/render_server.rs

@@ -25,8 +25,6 @@ impl RpcDescription {
 			}
 		};
 
-		// panic!("{}", trait_impl);
-
 		Ok(trait_impl)
 	}
 
@@ -72,7 +70,7 @@ impl RpcDescription {
 				let rpc_method_name = self.rpc_identifier(&method.name);
 				// `parsing` is the code associated with parsing structure from the
 				// provided `RpcParams` object.
-				// `params_seq` is the comma-delimited sequence of parametsrs.
+				// `params_seq` is the comma-delimited sequence of parameters.
 				let (parsing, params_seq) = self.render_params_decoding(&method.params);
 
 				check_name(rpc_method_name.clone(), rust_method_name.span());
@@ -82,7 +80,7 @@ impl RpcDescription {
 						rpc.register_async_method(#rpc_method_name, |params, context| {
 							let fut = async move {
 								#parsing
-								Ok(context.as_ref().#rust_method_name(#params_seq).await)
+								context.as_ref().#rust_method_name(#params_seq).await
 							};
 							Box::pin(fut)
 						})?;
@@ -91,7 +89,7 @@ impl RpcDescription {
 					quote! {
 						rpc.register_method(#rpc_method_name, |params, context| {
 							#parsing
-							Ok(context.#rust_method_name(#params_seq))
+							context.#rust_method_name(#params_seq)
 						})?;
 					}
 				}
@@ -110,7 +108,7 @@ impl RpcDescription {
 				let rpc_unsub_name = self.rpc_identifier(&sub.unsub_method);
 				// `parsing` is the code associated with parsing structure from the
 				// provided `RpcParams` object.
-				// `params_seq` is the comma-delimited sequence of parametsrs.
+				// `params_seq` is the comma-delimited sequence of parameters.
 				let (parsing, params_seq) = self.render_params_decoding(&sub.params);
 
 				check_name(rpc_sub_name.clone(), rust_method_name.span());

proc-macros/tests/rpc_example.rs

@@ -1,15 +1,16 @@
 //! Example of using proc macro to generate working client and server.
 
+use jsonrpsee::types::Error;
 use jsonrpsee_proc_macros::rpc;
 use std::borrow::Cow;
 
 #[rpc(client, server, namespace = "foo")]
 pub trait Rpc {
 	#[method(name = "foo")]
-	async fn async_method(&self, param_a: u8, param_b: Option<Cow<'_, str>>) -> u16;
+	async fn async_method(&self, param_a: u8, param_b: Option<Cow<'_, str>>) -> Result<u16, Error>;
 
 	#[method(name = "bar")]
-	fn sync_method(&self) -> u16;
+	fn sync_method(&self) -> Result<u16, Error>;
 
 	#[subscription(name = "sub", unsub = "unsub", item = String)]
 	fn sub(&self);

proc-macros/tests/ui/correct/basic.rs

@@ -2,7 +2,7 @@
 
 use jsonrpsee::{
 	proc_macros::rpc,
-	types::async_trait,
+	types::{async_trait, JsonRpcResult},
 	ws_client::*,
 	ws_server::{SubscriptionSink, WsServerBuilder},
 };
@@ -11,10 +11,10 @@ use std::{net::SocketAddr, sync::mpsc::channel};
 #[rpc(client, server, namespace = "foo")]
 pub trait Rpc {
 	#[method(name = "foo")]
-	async fn async_method(&self, param_a: u8, param_b: String) -> u16;
+	async fn async_method(&self, param_a: u8, param_b: String) -> JsonRpcResult<u16>;
 
 	#[method(name = "bar")]
-	fn sync_method(&self) -> u16;
+	fn sync_method(&self) -> JsonRpcResult<u16>;
 
 	#[subscription(name = "sub", unsub = "unsub", item = String)]
 	fn sub(&self);
@@ -27,12 +27,12 @@ pub struct RpcServerImpl;
 
 #[async_trait]
 impl RpcServer for RpcServerImpl {
-	async fn async_method(&self, _param_a: u8, _param_b: String) -> u16 {
-		42u16
+	async fn async_method(&self, _param_a: u8, _param_b: String) -> JsonRpcResult<u16> {
+		Ok(42u16)
 	}
 
-	fn sync_method(&self) -> u16 {
-		10u16
+	fn sync_method(&self) -> JsonRpcResult<u16> {
+		Ok(10u16)
 	}
 
 	fn sub(&self, mut sink: SubscriptionSink) {

proc-macros/tests/ui/correct/only_client.rs

@@ -1,14 +1,14 @@
 //! Example of using proc macro to generate working client and server.
 
-use jsonrpsee::proc_macros::rpc;
+use jsonrpsee::{proc_macros::rpc, types::JsonRpcResult};
 
 #[rpc(client)]
 pub trait Rpc {
 	#[method(name = "foo")]
-	async fn async_method(&self, param_a: u8, param_b: String) -> u16;
+	async fn async_method(&self, param_a: u8, param_b: String) -> JsonRpcResult<u16>;
 
 	#[method(name = "bar")]
-	fn sync_method(&self) -> u16;
+	fn sync_method(&self) -> JsonRpcResult<u16>;
 
 	#[subscription(name = "sub", unsub = "unsub", item = String)]
 	fn sub(&self);

proc-macros/tests/ui/correct/only_server.rs

@@ -1,17 +1,17 @@
 use jsonrpsee::{
 	proc_macros::rpc,
-	types::async_trait,
+	types::{async_trait, JsonRpcResult},
 	ws_server::{SubscriptionSink, WsServerBuilder},
 };
 use std::{net::SocketAddr, sync::mpsc::channel};
 
 #[rpc(server)]
 pub trait Rpc {
 	#[method(name = "foo")]
-	async fn async_method(&self, param_a: u8, param_b: String) -> u16;
+	async fn async_method(&self, param_a: u8, param_b: String) -> JsonRpcResult<u16>;
 
 	#[method(name = "bar")]
-	fn sync_method(&self) -> u16;
+	fn sync_method(&self) -> JsonRpcResult<u16>;
 
 	#[subscription(name = "sub", unsub = "unsub", item = String)]
 	fn sub(&self);
@@ -21,12 +21,12 @@ pub struct RpcServerImpl;
 
 #[async_trait]
 impl RpcServer for RpcServerImpl {
-	async fn async_method(&self, _param_a: u8, _param_b: String) -> u16 {
-		42u16
+	async fn async_method(&self, _param_a: u8, _param_b: String) -> JsonRpcResult<u16> {
+		Ok(42u16)
 	}
 
-	fn sync_method(&self) -> u16 {
-		10u16
+	fn sync_method(&self) -> JsonRpcResult<u16> {
+		Ok(10u16)
 	}
 
 	fn sub(&self, mut sink: SubscriptionSink) {

proc-macros/tests/ui/incorrect/method/method_no_name.rs

@@ -4,7 +4,7 @@ use jsonrpsee::proc_macros::rpc;
 #[rpc(client, server)]
 pub trait NoMethodName {
 	#[method()]
-	async fn async_method(&self) -> u8;
+	async fn async_method(&self) -> jsonrpsee::types::JsonRpcResult<u8>;
 }
 
 fn main() {}

proc-macros/tests/ui/incorrect/method/method_unexpected_field.rs

@@ -4,7 +4,7 @@ use jsonrpsee::proc_macros::rpc;
 #[rpc(client, server)]
 pub trait UnexpectedField {
 	#[method(name = "foo", magic = false)]
-	async fn async_method(&self) -> u8;
+	async fn async_method(&self) -> jsonrpsee::types::JsonRpcResult<u8>;
 }
 
 fn main() {}