feat(middleware): expose type of the method call (#820)

core/src/middleware.rs

@@ -31,6 +31,32 @@ use std::net::SocketAddr;
 pub use http::HeaderMap as Headers;
 pub use jsonrpsee_types::Params;
 
+/// The type JSON-RPC v2 call, it can be a subscription, method call or unknown.
+#[derive(Debug, Copy, Clone)]
+pub enum MethodKind {
+	/// Subscription Call.
+	Subscription,
+	/// Unsubscription Call.
+	Unsubscription,
+	/// Method call.
+	MethodCall,
+	/// Unknown method.
+	Unknown,
+}
+
+impl std::fmt::Display for MethodKind {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		let s = match self {
+			Self::Subscription => "subscription",
+			Self::MethodCall => "method call",
+			Self::Unknown => "unknown",
+			Self::Unsubscription => "unsubscription",
+		};
+
+		write!(f, "{}", s)
+	}
+}
+
 /// Defines a middleware specifically for HTTP requests with callbacks during the RPC request life-cycle.
 /// The primary use case for this is to collect timings for a larger metrics collection solution.
 ///
@@ -45,7 +71,7 @@ pub trait HttpMiddleware: Send + Sync + Clone + 'static {
 	fn on_request(&self, remote_addr: SocketAddr, headers: &Headers) -> Self::Instant;
 
 	/// Called on each JSON-RPC method call, batch requests will trigger `on_call` multiple times.
-	fn on_call(&self, method_name: &str, params: Params);
+	fn on_call(&self, method_name: &str, params: Params, kind: MethodKind);
 
 	/// Called on each JSON-RPC method completion, batch requests will trigger `on_result` multiple times.
 	fn on_result(&self, method_name: &str, success: bool, started_at: Self::Instant);
@@ -71,7 +97,7 @@ pub trait WsMiddleware: Send + Sync + Clone + 'static {
 	fn on_request(&self) -> Self::Instant;
 
 	/// Called on each JSON-RPC method call, batch requests will trigger `on_call` multiple times.
-	fn on_call(&self, method_name: &str, params: Params);
+	fn on_call(&self, method_name: &str, params: Params, kind: MethodKind);
 
 	/// Called on each JSON-RPC method completion, batch requests will trigger `on_result` multiple times.
 	fn on_result(&self, method_name: &str, success: bool, started_at: Self::Instant);
@@ -88,7 +114,7 @@ impl HttpMiddleware for () {
 
 	fn on_request(&self, _: std::net::SocketAddr, _: &Headers) -> Self::Instant {}
 
-	fn on_call(&self, _: &str, _: Params) {}
+	fn on_call(&self, _: &str, _: Params, _: MethodKind) {}
 
 	fn on_result(&self, _: &str, _: bool, _: Self::Instant) {}
 
@@ -102,7 +128,7 @@ impl WsMiddleware for () {
 
 	fn on_request(&self) -> Self::Instant {}
 
-	fn on_call(&self, _: &str, _: Params) {}
+	fn on_call(&self, _: &str, _: Params, _: MethodKind) {}
 
 	fn on_result(&self, _: &str, _: bool, _: Self::Instant) {}
 
@@ -126,9 +152,9 @@ where
 		(self.0.on_request(), self.1.on_request())
 	}
 
-	fn on_call(&self, method_name: &str, params: Params) {
-		self.0.on_call(method_name, params.clone());
-		self.1.on_call(method_name, params);
+	fn on_call(&self, method_name: &str, params: Params, kind: MethodKind) {
+		self.0.on_call(method_name, params.clone(), kind);
+		self.1.on_call(method_name, params, kind);
 	}
 
 	fn on_result(&self, method_name: &str, success: bool, started_at: Self::Instant) {
@@ -157,9 +183,9 @@ where
 		(self.0.on_request(remote_addr, headers), self.1.on_request(remote_addr, headers))
 	}
 
-	fn on_call(&self, method_name: &str, params: Params) {
-		self.0.on_call(method_name, params.clone());
-		self.1.on_call(method_name, params);
+	fn on_call(&self, method_name: &str, params: Params, kind: MethodKind) {
+		self.0.on_call(method_name, params.clone(), kind);
+		self.1.on_call(method_name, params, kind);
 	}
 
 	fn on_result(&self, method_name: &str, success: bool, started_at: Self::Instant) {

examples/examples/middleware_http.rs

@@ -28,7 +28,7 @@ use std::net::SocketAddr;
 use std::time::Instant;
 
 use jsonrpsee::core::client::ClientT;
-use jsonrpsee::core::middleware::{self, Headers, Params};
+use jsonrpsee::core::middleware::{self, Headers, MethodKind, Params};
 use jsonrpsee::http_client::HttpClientBuilder;
 use jsonrpsee::http_server::{HttpServerBuilder, HttpServerHandle, RpcModule};
 
@@ -43,8 +43,8 @@ impl middleware::HttpMiddleware for Timings {
 		Instant::now()
 	}
 
-	fn on_call(&self, name: &str, params: Params) {
-		println!("[Middleware::on_call] method: '{}', params: {:?}", name, params);
+	fn on_call(&self, name: &str, params: Params, kind: MethodKind) {
+		println!("[Middleware::on_call] method: '{}', params: {:?}, kind: {}", name, params, kind);
 	}
 
 	fn on_result(&self, name: &str, succeess: bool, started_at: Self::Instant) {

examples/examples/middleware_ws.rs

@@ -28,7 +28,7 @@ use std::net::SocketAddr;
 use std::time::Instant;
 
 use jsonrpsee::core::client::ClientT;
-use jsonrpsee::core::middleware::{self, Headers, Params};
+use jsonrpsee::core::middleware::{self, Headers, MethodKind, Params};
 use jsonrpsee::ws_client::WsClientBuilder;
 use jsonrpsee::ws_server::{RpcModule, WsServerBuilder};
 
@@ -47,8 +47,8 @@ impl middleware::WsMiddleware for Timings {
 		Instant::now()
 	}
 
-	fn on_call(&self, name: &str, params: Params) {
-		println!("[Middleware::on_call] method: '{}' params: {:?}", name, params);
+	fn on_call(&self, name: &str, params: Params, kind: MethodKind) {
+		println!("[Middleware::on_call] method: '{}', params: {:?}, kind: {}", name, params, kind);
 	}
 
 	fn on_result(&self, name: &str, succeess: bool, started_at: Self::Instant) {

examples/examples/multi_middleware.rs

@@ -30,6 +30,7 @@ use std::net::SocketAddr;
 use std::process::Command;
 use std::time::Instant;
 
+use jsonrpsee::core::middleware::MethodKind;
 use jsonrpsee::core::{client::ClientT, middleware, middleware::Headers};
 use jsonrpsee::rpc_params;
 use jsonrpsee::types::Params;
@@ -51,8 +52,8 @@ impl middleware::WsMiddleware for Timings {
 		Instant::now()
 	}
 
-	fn on_call(&self, name: &str, _params: Params) {
-		println!("[Timings] They called '{}'", name);
+	fn on_call(&self, name: &str, params: Params, kind: MethodKind) {
+		println!("[Timings:on_call] method: '{}', params: {:?}, kind: {}", name, params, kind);
 	}
 
 	fn on_result(&self, name: &str, succeess: bool, started_at: Self::Instant) {
@@ -94,7 +95,7 @@ impl middleware::WsMiddleware for ThreadWatcher {
 		println!("[ThreadWatcher::on_connect] remote_addr {}, headers: {:?}", remote_addr, headers);
 	}
 
-	fn on_call(&self, _method: &str, _params: Params) {
+	fn on_call(&self, _method: &str, _params: Params, _kind: MethodKind) {
 		let threads = Self::count_threads();
 		println!("[ThreadWatcher::on_call] Threads running on the machine at the start of a call: {}", threads);
 	}

http-server/src/server.rs

@@ -41,7 +41,7 @@ use hyper::service::{make_service_fn, service_fn};
 use hyper::{Error as HyperError, Method};
 use jsonrpsee_core::error::{Error, GenericTransportError};
 use jsonrpsee_core::http_helpers::{self, read_body};
-use jsonrpsee_core::middleware::HttpMiddleware as Middleware;
+use jsonrpsee_core::middleware::{self, HttpMiddleware as Middleware};
 use jsonrpsee_core::server::access_control::AccessControl;
 use jsonrpsee_core::server::helpers::{prepare_error, MethodResponse};
 use jsonrpsee_core::server::helpers::{BatchResponse, BatchResponseBuilder};
@@ -102,7 +102,7 @@ impl<M> Builder<M> {
 	/// ```
 	/// use std::{time::Instant, net::SocketAddr};
 	///
-	/// use jsonrpsee_core::middleware::{HttpMiddleware, Headers, Params};
+	/// use jsonrpsee_core::middleware::{HttpMiddleware, Headers, MethodKind, Params};
 	/// use jsonrpsee_http_server::HttpServerBuilder;
 	///
 	/// #[derive(Clone)]
@@ -119,8 +119,8 @@ impl<M> Builder<M> {
 	///
 	///     // Called once a single JSON-RPC method call is processed, it may be called multiple times
 	///     // on batches.
-	///     fn on_call(&self, method_name: &str, params: Params) {
-	///         println!("Call to method: '{}' params: {:?}", method_name, params);
+	///     fn on_call(&self, method_name: &str, params: Params, kind: MethodKind) {
+	///         println!("Call to method: '{}' params: {:?}, kind: {}", method_name, params, kind);
 	///     }
 	///
 	///     // Called once a single JSON-RPC call is completed, it may be called multiple times
@@ -833,12 +833,16 @@ async fn execute_call<M: Middleware>(c: Call<'_, M>) -> MethodResponse {
 	let CallData { resources, methods, middleware, max_response_body_size, max_log_length, conn_id, request_start } =
 		call;
 
-	middleware.on_call(name, params.clone());
-
 	let response = match methods.method_with_name(name) {
-		None => MethodResponse::error(id, ErrorObject::from(ErrorCode::MethodNotFound)),
+		None => {
+			middleware.on_call(name, params.clone(), middleware::MethodKind::Unknown);
+			MethodResponse::error(id, ErrorObject::from(ErrorCode::MethodNotFound))
+		}
 		Some((name, method)) => match &method.inner() {
-			MethodKind::Sync(callback) => match method.claim(name, resources) {
+			MethodKind::Sync(callback) => {
+				middleware.on_call(name, params.clone(), middleware::MethodKind::MethodCall);
+
+				match method.claim(name, resources) {
 					Ok(guard) => {
 						let r = (callback)(id, params, max_response_body_size as usize);
 						drop(guard);
@@ -848,8 +852,11 @@ async fn execute_call<M: Middleware>(c: Call<'_, M>) -> MethodResponse {
 						tracing::error!("[Methods::execute_with_resources] failed to lock resources: {:?}", err);
 						MethodResponse::error(id, ErrorObject::from(ErrorCode::ServerIsBusy))
 					}
-			},
-			MethodKind::Async(callback) => match method.claim(name, resources) {
+				}
+			}
+			MethodKind::Async(callback) => {
+				middleware.on_call(name, params.clone(), middleware::MethodKind::MethodCall);
+				match method.claim(name, resources) {
 					Ok(guard) => {
 						let id = id.into_owned();
 						let params = params.into_owned();
@@ -860,8 +867,10 @@ async fn execute_call<M: Middleware>(c: Call<'_, M>) -> MethodResponse {
 						tracing::error!("[Methods::execute_with_resources] failed to lock resources: {:?}", err);
 						MethodResponse::error(id, ErrorObject::from(ErrorCode::ServerIsBusy))
 					}
-			},
+				}
+			}
 			MethodKind::Subscription(_) | MethodKind::Unsubscription(_) => {
+				middleware.on_call(name, params.clone(), middleware::MethodKind::Unknown);
 				tracing::error!("Subscriptions not supported on HTTP");
 				MethodResponse::error(id, ErrorObject::from(ErrorCode::InternalError))
 			}

tests/tests/middleware.rs

@@ -30,7 +30,7 @@ use std::sync::{Arc, Mutex};
 use std::time::Duration;
 
 use hyper::HeaderMap;
-use jsonrpsee::core::middleware::{HttpMiddleware, WsMiddleware};
+use jsonrpsee::core::middleware::{HttpMiddleware, MethodKind, WsMiddleware};
 use jsonrpsee::core::{client::ClientT, Error};
 use jsonrpsee::http_client::HttpClientBuilder;
 use jsonrpsee::http_server::{HttpServerBuilder, HttpServerHandle};
@@ -73,7 +73,7 @@ impl WsMiddleware for Counter {
 		n
 	}
 
-	fn on_call(&self, name: &str, _params: Params) {
+	fn on_call(&self, name: &str, _params: Params, _kind: MethodKind) {
 		let mut inner = self.inner.lock().unwrap();
 		let entry = inner.calls.entry(name.into()).or_insert((0, Vec::new()));
 
@@ -108,7 +108,7 @@ impl HttpMiddleware for Counter {
 		n
 	}
 
-	fn on_call(&self, name: &str, _params: Params) {
+	fn on_call(&self, name: &str, _params: Params, _kind: MethodKind) {
 		let mut inner = self.inner.lock().unwrap();
 		let entry = inner.calls.entry(name.into()).or_insert((0, Vec::new()));
 

ws-server/src/server.rs

@@ -42,7 +42,7 @@ use futures_util::TryStreamExt;
 use http::header::{HOST, ORIGIN};
 use http::{HeaderMap, HeaderValue};
 use jsonrpsee_core::id_providers::RandomIntegerIdProvider;
-use jsonrpsee_core::middleware::WsMiddleware as Middleware;
+use jsonrpsee_core::middleware::{self, WsMiddleware as Middleware};
 use jsonrpsee_core::server::access_control::AccessControl;
 use jsonrpsee_core::server::helpers::{
 	prepare_error, BatchResponse, BatchResponseBuilder, BoundedSubscriptions, MethodResponse, MethodSink,
@@ -655,7 +655,7 @@ impl<M> Builder<M> {
 	/// ```
 	/// use std::{time::Instant, net::SocketAddr};
 	///
-	/// use jsonrpsee_core::middleware::{WsMiddleware, Headers, Params};
+	/// use jsonrpsee_core::middleware::{WsMiddleware, Headers, MethodKind, Params};
 	/// use jsonrpsee_ws_server::WsServerBuilder;
 	///
 	/// #[derive(Clone)]
@@ -672,8 +672,8 @@ impl<M> Builder<M> {
 	///          Instant::now()
 	///     }
 	///
-	///     fn on_call(&self, method_name: &str, params: Params) {
-	///          println!("[MyMiddleware::on_call] method: '{}' params: {:?}", method_name, params);
+	///     fn on_call(&self, method_name: &str, params: Params, kind: MethodKind) {
+	///          println!("[MyMiddleware::on_call] method: '{}' params: {:?}, kind: {:?}", method_name, params, kind);
 	///     }
 	///
 	///     fn on_result(&self, method_name: &str, success: bool, started_at: Self::Instant) {
@@ -929,15 +929,17 @@ async fn execute_call<M: Middleware>(c: Call<'_, M>) -> MethodResult {
 		request_start,
 	} = call;
 
-	middleware.on_call(name, params.clone());
-
 	let response = match methods.method_with_name(name) {
 		None => {
+			middleware.on_call(name, params.clone(), middleware::MethodKind::Unknown);
 			let response = MethodResponse::error(id, ErrorObject::from(ErrorCode::MethodNotFound));
 			MethodResult::SendAndMiddleware(response)
 		}
 		Some((name, method)) => match &method.inner() {
-			MethodKind::Sync(callback) => match method.claim(name, resources) {
+			MethodKind::Sync(callback) => {
+				middleware.on_call(name, params.clone(), middleware::MethodKind::MethodCall);
+
+				match method.claim(name, resources) {
 					Ok(guard) => {
 						let r = (callback)(id, params, max_response_body_size as usize);
 						drop(guard);
@@ -948,13 +950,18 @@ async fn execute_call<M: Middleware>(c: Call<'_, M>) -> MethodResult {
 						let response = MethodResponse::error(id, ErrorObject::from(ErrorCode::ServerIsBusy));
 						MethodResult::SendAndMiddleware(response)
 					}
-			},
-			MethodKind::Async(callback) => match method.claim(name, resources) {
+				}
+			}
+			MethodKind::Async(callback) => {
+				middleware.on_call(name, params.clone(), middleware::MethodKind::MethodCall);
+
+				match method.claim(name, resources) {
 					Ok(guard) => {
 						let id = id.into_owned();
 						let params = params.into_owned();
 
-					let response = (callback)(id, params, conn_id, max_response_body_size as usize, Some(guard)).await;
+						let response =
+							(callback)(id, params, conn_id, max_response_body_size as usize, Some(guard)).await;
 						MethodResult::SendAndMiddleware(response)
 					}
 					Err(err) => {
@@ -962,8 +969,12 @@ async fn execute_call<M: Middleware>(c: Call<'_, M>) -> MethodResult {
 						let response = MethodResponse::error(id, ErrorObject::from(ErrorCode::ServerIsBusy));
 						MethodResult::SendAndMiddleware(response)
 					}
-			},
-			MethodKind::Subscription(callback) => match method.claim(name, resources) {
+				}
+			}
+			MethodKind::Subscription(callback) => {
+				middleware.on_call(name, params.clone(), middleware::MethodKind::Subscription);
+
+				match method.claim(name, resources) {
 					Ok(guard) => {
 						if let Some(cn) = bounded_subscriptions.acquire() {
 							let conn_state = ConnState { conn_id, close_notify: cn, id_provider };
@@ -980,8 +991,11 @@ async fn execute_call<M: Middleware>(c: Call<'_, M>) -> MethodResult {
 						let response = MethodResponse::error(id, ErrorObject::from(ErrorCode::ServerIsBusy));
 						MethodResult::SendAndMiddleware(response)
 					}
-			},
+				}
+			}
 			MethodKind::Unsubscription(callback) => {
+				middleware.on_call(name, params.clone(), middleware::MethodKind::Unsubscription);
+
 				// Don't adhere to any resource or subscription limits; always let unsubscribing happen!
 				let result = callback(id, params, conn_id, max_response_body_size as usize);
 				MethodResult::SendAndMiddleware(result)