use std::collections::HashMap;
use std::net::SocketAddr;
use std::pin::Pin;
use std::sync::Arc;
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::data::*;
use crate::error::Error;
use crate::server::TlsConfig;
use crate::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,
) -> 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 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))?;
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();
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 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));
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) => {
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) => {
eprintln!("RPC server TLS error: {}", 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| {
eprintln!("RPC handler error: {}", e);
e
})
}))
}
});
let server = Server::builder(incoming).serve(service);
let graceful = server.with_graceful_shutdown(shutdown_signal);
println!("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| {
eprintln!("RPC handler error: {}", e);
e
})
}))
}
});
let server = Server::bind(&self.bind_addr).serve(service);
let graceful = server.with_graceful_shutdown(shutdown_signal);
println!("RPC server listening on http://{}", self.bind_addr);
graceful.await?;
}
Ok(())
}
}
