1 files changed, 219 insertions, 0 deletions
diff --git a/src/rpc/rpc_server.rs b/src/rpc/rpc_server.rs
new file mode 100644
index 00000000..4ee53909
--- /dev/null
+++ b/src/rpc/rpc_server.rs
@@ -0,0 +1,219 @@
+use std::collections::HashMap;
+use std::net::SocketAddr;
+use std::pin::Pin;
+use std::sync::Arc;
+use std::time::Instant;
+
+use bytes::IntoBuf;
+use futures::future::Future;
+use futures_util::future::*;
+use futures_util::stream::*;
+use hyper::server::conn::AddrStream;
+use hyper::service::{make_service_fn, service_fn};
+use hyper::{Body, Method, Request, Response, Server, StatusCode};
+use serde::{Deserialize, Serialize};
+use tokio::net::{TcpListener, TcpStream};
+use tokio_rustls::server::TlsStream;
+use tokio_rustls::TlsAcceptor;
+
+use crate::config::TlsConfig;
+use crate::data::*;
+use crate::error::Error;
+
+use crate::rpc::tls_util;
+
+pub trait RpcMessage: Serialize + for<'de> Deserialize<'de> + Send + Sync {}
+
+type ResponseFuture = Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>>;
+type Handler = Box<dyn Fn(Request<Body>, SocketAddr) -> ResponseFuture + Send + Sync>;
+
+pub struct RpcServer {
+	pub bind_addr: SocketAddr,
+	pub tls_config: Option<TlsConfig>,
+
+	handlers: HashMap<String, Handler>,
+}
+
+async fn handle_func<M, F, Fut>(
+	handler: Arc<F>,
+	req: Request<Body>,
+	sockaddr: SocketAddr,
+	name: Arc<String>,
+) -> Result<Response<Body>, Error>
+where
+	M: RpcMessage + 'static,
+	F: Fn(M, SocketAddr) -> Fut + Send + Sync + 'static,
+	Fut: Future<Output = Result<M, Error>> + Send + 'static,
+{
+	let begin_time = Instant::now();
+	let whole_body = hyper::body::to_bytes(req.into_body()).await?;
+	let msg = rmp_serde::decode::from_read::<_, M>(whole_body.into_buf())?;
+	match handler(msg, sockaddr).await {
+		Ok(resp) => {
+			let resp_bytes = rmp_to_vec_all_named::<Result<M, String>>(&Ok(resp))?;
+			let rpc_duration = (Instant::now() - begin_time).as_millis();
+			if rpc_duration > 100 {
+				debug!("RPC {} ok, took long: {} ms", name, rpc_duration,);
+			}
+			Ok(Response::new(Body::from(resp_bytes)))
+		}
+		Err(e) => {
+			let err_str = format!("{}", e);
+			let rep_bytes = rmp_to_vec_all_named::<Result<M, String>>(&Err(err_str))?;
+			let mut err_response = Response::new(Body::from(rep_bytes));
+			*err_response.status_mut() = e.http_status_code();
+			warn!(
+				"RPC error ({}): {} ({} ms)",
+				name,
+				e,
+				(Instant::now() - begin_time).as_millis(),
+			);
+			Ok(err_response)
+		}
+	}
+}
+
+impl RpcServer {
+	pub fn new(bind_addr: SocketAddr, tls_config: Option<TlsConfig>) -> Self {
+		Self {
+			bind_addr,
+			tls_config,
+			handlers: HashMap::new(),
+		}
+	}
+
+	pub fn add_handler<M, F, Fut>(&mut self, name: String, handler: F)
+	where
+		M: RpcMessage + 'static,
+		F: Fn(M, SocketAddr) -> Fut + Send + Sync + 'static,
+		Fut: Future<Output = Result<M, Error>> + Send + 'static,
+	{
+		let name2 = Arc::new(name.clone());
+		let handler_arc = Arc::new(handler);
+		let handler = Box::new(move |req: Request<Body>, sockaddr: SocketAddr| {
+			let handler2 = handler_arc.clone();
+			let b: ResponseFuture = Box::pin(handle_func(handler2, req, sockaddr, name2.clone()));
+			b
+		});
+		self.handlers.insert(name, handler);
+	}
+
+	async fn handler(
+		self: Arc<Self>,
+		req: Request<Body>,
+		addr: SocketAddr,
+	) -> Result<Response<Body>, Error> {
+		if req.method() != &Method::POST {
+			let mut bad_request = Response::default();
+			*bad_request.status_mut() = StatusCode::BAD_REQUEST;
+			return Ok(bad_request);
+		}
+
+		let path = &req.uri().path()[1..];
+		let handler = match self.handlers.get(path) {
+			Some(h) => h,
+			None => {
+				let mut not_found = Response::default();
+				*not_found.status_mut() = StatusCode::NOT_FOUND;
+				return Ok(not_found);
+			}
+		};
+
+		let resp_waiter = tokio::spawn(handler(req, addr));
+		match resp_waiter.await {
+			Err(err) => {
+				warn!("Handler await error: {}", err);
+				let mut ise = Response::default();
+				*ise.status_mut() = StatusCode::INTERNAL_SERVER_ERROR;
+				Ok(ise)
+			}
+			Ok(Err(err)) => {
+				let mut bad_request = Response::new(Body::from(format!("{}", err)));
+				*bad_request.status_mut() = StatusCode::BAD_REQUEST;
+				Ok(bad_request)
+			}
+			Ok(Ok(resp)) => Ok(resp),
+		}
+	}
+
+	pub async fn run(
+		self: Arc<Self>,
+		shutdown_signal: impl Future<Output = ()>,
+	) -> Result<(), Error> {
+		if let Some(tls_config) = self.tls_config.as_ref() {
+			let ca_certs = tls_util::load_certs(&tls_config.ca_cert)?;
+			let node_certs = tls_util::load_certs(&tls_config.node_cert)?;
+			let node_key = tls_util::load_private_key(&tls_config.node_key)?;
+
+			let mut ca_store = rustls::RootCertStore::empty();
+			for crt in ca_certs.iter() {
+				ca_store.add(crt)?;
+			}
+
+			let mut config =
+				rustls::ServerConfig::new(rustls::AllowAnyAuthenticatedClient::new(ca_store));
+			config.set_single_cert([&node_certs[..], &ca_certs[..]].concat(), node_key)?;
+			let tls_acceptor = Arc::new(TlsAcceptor::from(Arc::new(config)));
+
+			let mut listener = TcpListener::bind(&self.bind_addr).await?;
+			let incoming = listener.incoming().filter_map(|socket| async {
+				match socket {
+					Ok(stream) => match tls_acceptor.clone().accept(stream).await {
+						Ok(x) => Some(Ok::<_, hyper::Error>(x)),
+						Err(_e) => None,
+					},
+					Err(_) => None,
+				}
+			});
+			let incoming = hyper::server::accept::from_stream(incoming);
+
+			let self_arc = self.clone();
+			let service = make_service_fn(|conn: &TlsStream<TcpStream>| {
+				let client_addr = conn
+					.get_ref()
+					.0
+					.peer_addr()
+					.unwrap_or(([0, 0, 0, 0], 0).into());
+				let self_arc = self_arc.clone();
+				async move {
+					Ok::<_, Error>(service_fn(move |req: Request<Body>| {
+						self_arc.clone().handler(req, client_addr).map_err(|e| {
+							warn!("RPC handler error: {}", e);
+							e
+						})
+					}))
+				}
+			});
+
+			let server = Server::builder(incoming).serve(service);
+
+			let graceful = server.with_graceful_shutdown(shutdown_signal);
+			info!("RPC server listening on http://{}", self.bind_addr);
+
+			graceful.await?;
+		} else {
+			let self_arc = self.clone();
+			let service = make_service_fn(move |conn: &AddrStream| {
+				let client_addr = conn.remote_addr();
+				let self_arc = self_arc.clone();
+				async move {
+					Ok::<_, Error>(service_fn(move |req: Request<Body>| {
+						self_arc.clone().handler(req, client_addr).map_err(|e| {
+							warn!("RPC handler error: {}", e);
+							e
+						})
+					}))
+				}
+			});
+
+			let server = Server::bind(&self.bind_addr).serve(service);
+
+			let graceful = server.with_graceful_shutdown(shutdown_signal);
+			info!("RPC server listening on http://{}", self.bind_addr);
+
+			graceful.await?;
+		}
+
+		Ok(())
+	}
+}