forked from Deuxfleurs/garage
248 lines
7.0 KiB
Rust
248 lines
7.0 KiB
Rust
//! Contains structs related to receiving RPCs
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use std::collections::HashMap;
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use std::net::SocketAddr;
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use std::pin::Pin;
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use std::sync::Arc;
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use std::time::Instant;
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use futures::future::Future;
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use futures_util::future::*;
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use futures_util::stream::*;
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use hyper::server::conn::AddrStream;
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use hyper::service::{make_service_fn, service_fn};
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use hyper::{Body, Method, Request, Response, Server, StatusCode};
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use serde::{Deserialize, Serialize};
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use tokio::net::{TcpListener, TcpStream};
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use tokio_rustls::server::TlsStream;
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use tokio_rustls::TlsAcceptor;
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use tokio_stream::wrappers::TcpListenerStream;
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use garage_util::config::TlsConfig;
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use garage_util::data::*;
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use garage_util::error::Error;
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use crate::tls_util;
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/// Trait for messages that can be sent as RPC
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pub trait RpcMessage: Serialize + for<'de> Deserialize<'de> + Send + Sync {}
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type ResponseFuture = Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>>;
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type Handler = Box<dyn Fn(Request<Body>, SocketAddr) -> ResponseFuture + Send + Sync>;
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/// Structure handling RPCs
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pub struct RpcServer {
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/// The address the RpcServer will bind
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pub bind_addr: SocketAddr,
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/// The tls configuration used for RPC
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pub tls_config: Option<TlsConfig>,
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handlers: HashMap<String, Handler>,
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}
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async fn handle_func<M, F, Fut>(
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handler: Arc<F>,
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req: Request<Body>,
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sockaddr: SocketAddr,
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name: Arc<String>,
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) -> Result<Response<Body>, Error>
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where
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M: RpcMessage + 'static,
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F: Fn(M, SocketAddr) -> Fut + Send + Sync + 'static,
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Fut: Future<Output = Result<M, Error>> + Send + 'static,
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{
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let begin_time = Instant::now();
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let whole_body = hyper::body::to_bytes(req.into_body()).await?;
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let msg = rmp_serde::decode::from_read::<_, M>(&whole_body[..])?;
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trace!(
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"Request message: {}",
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serde_json::to_string(&msg)
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.unwrap_or("<json error>".into())
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.chars()
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.take(100)
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.collect::<String>()
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);
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match handler(msg, sockaddr).await {
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Ok(resp) => {
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let resp_bytes = rmp_to_vec_all_named::<Result<M, String>>(&Ok(resp))?;
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let rpc_duration = (Instant::now() - begin_time).as_millis();
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if rpc_duration > 100 {
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debug!("RPC {} ok, took long: {} ms", name, rpc_duration,);
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}
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Ok(Response::new(Body::from(resp_bytes)))
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}
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Err(e) => {
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let err_str = format!("{}", e);
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let rep_bytes = rmp_to_vec_all_named::<Result<M, String>>(&Err(err_str))?;
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let mut err_response = Response::new(Body::from(rep_bytes));
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*err_response.status_mut() = match e {
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Error::BadRPC(_) => StatusCode::BAD_REQUEST,
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_ => StatusCode::INTERNAL_SERVER_ERROR,
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};
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warn!(
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"RPC error ({}): {} ({} ms)",
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name,
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e,
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(Instant::now() - begin_time).as_millis(),
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);
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Ok(err_response)
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}
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}
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}
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impl RpcServer {
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/// Create a new RpcServer
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pub fn new(bind_addr: SocketAddr, tls_config: Option<TlsConfig>) -> Self {
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Self {
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bind_addr,
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tls_config,
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handlers: HashMap::new(),
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}
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}
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/// Add handler handling request made to `name`
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pub fn add_handler<M, F, Fut>(&mut self, name: String, handler: F)
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where
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M: RpcMessage + 'static,
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F: Fn(M, SocketAddr) -> Fut + Send + Sync + 'static,
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Fut: Future<Output = Result<M, Error>> + Send + 'static,
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{
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let name2 = Arc::new(name.clone());
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let handler_arc = Arc::new(handler);
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let handler = Box::new(move |req: Request<Body>, sockaddr: SocketAddr| {
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let handler2 = handler_arc.clone();
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let b: ResponseFuture = Box::pin(handle_func(handler2, req, sockaddr, name2.clone()));
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b
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});
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self.handlers.insert(name, handler);
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}
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async fn handler(
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self: Arc<Self>,
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req: Request<Body>,
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addr: SocketAddr,
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) -> Result<Response<Body>, Error> {
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if req.method() != &Method::POST {
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let mut bad_request = Response::default();
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*bad_request.status_mut() = StatusCode::BAD_REQUEST;
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return Ok(bad_request);
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}
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let path = &req.uri().path()[1..].to_string();
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let handler = match self.handlers.get(path) {
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Some(h) => h,
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None => {
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let mut not_found = Response::default();
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*not_found.status_mut() = StatusCode::NOT_FOUND;
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return Ok(not_found);
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}
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};
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trace!("({}) Handling request", path);
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let resp_waiter = tokio::spawn(handler(req, addr));
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match resp_waiter.await {
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Err(err) => {
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warn!("Handler await error: {}", err);
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let mut ise = Response::default();
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*ise.status_mut() = StatusCode::INTERNAL_SERVER_ERROR;
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Ok(ise)
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}
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Ok(Err(err)) => {
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trace!("({}) Request handler failed: {}", path, err);
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let mut bad_request = Response::new(Body::from(format!("{}", err)));
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*bad_request.status_mut() = StatusCode::BAD_REQUEST;
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Ok(bad_request)
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}
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Ok(Ok(resp)) => {
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trace!("({}) Request handler succeeded", path);
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Ok(resp)
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}
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}
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}
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/// Run the RpcServer
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pub async fn run(
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self: Arc<Self>,
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shutdown_signal: impl Future<Output = ()>,
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) -> Result<(), Error> {
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if let Some(tls_config) = self.tls_config.as_ref() {
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let ca_certs = tls_util::load_certs(&tls_config.ca_cert)?;
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let node_certs = tls_util::load_certs(&tls_config.node_cert)?;
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let node_key = tls_util::load_private_key(&tls_config.node_key)?;
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let mut ca_store = rustls::RootCertStore::empty();
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for crt in ca_certs.iter() {
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ca_store.add(crt)?;
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}
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let mut config =
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rustls::ServerConfig::new(rustls::AllowAnyAuthenticatedClient::new(ca_store));
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config.set_single_cert([&node_certs[..], &ca_certs[..]].concat(), node_key)?;
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let tls_acceptor = Arc::new(TlsAcceptor::from(Arc::new(config)));
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let listener = TcpListener::bind(&self.bind_addr).await?;
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let incoming = TcpListenerStream::new(listener).filter_map(|socket| async {
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match socket {
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Ok(stream) => match tls_acceptor.clone().accept(stream).await {
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Ok(x) => Some(Ok::<_, hyper::Error>(x)),
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Err(_e) => None,
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},
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Err(_) => None,
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}
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});
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let incoming = hyper::server::accept::from_stream(incoming);
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let self_arc = self.clone();
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let service = make_service_fn(|conn: &TlsStream<TcpStream>| {
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let client_addr = conn
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.get_ref()
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.0
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.peer_addr()
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.unwrap_or(([0, 0, 0, 0], 0).into());
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let self_arc = self_arc.clone();
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async move {
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Ok::<_, Error>(service_fn(move |req: Request<Body>| {
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self_arc.clone().handler(req, client_addr).map_err(|e| {
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warn!("RPC handler error: {}", e);
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e
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})
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}))
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}
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});
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let server = Server::builder(incoming).serve(service);
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let graceful = server.with_graceful_shutdown(shutdown_signal);
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info!("RPC server listening on http://{}", self.bind_addr);
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graceful.await?;
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} else {
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let self_arc = self.clone();
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let service = make_service_fn(move |conn: &AddrStream| {
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let client_addr = conn.remote_addr();
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let self_arc = self_arc.clone();
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async move {
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Ok::<_, Error>(service_fn(move |req: Request<Body>| {
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self_arc.clone().handler(req, client_addr).map_err(|e| {
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warn!("RPC handler error: {}", e);
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e
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})
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}))
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}
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});
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let server = Server::bind(&self.bind_addr).serve(service);
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let graceful = server.with_graceful_shutdown(shutdown_signal);
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info!("RPC server listening on http://{}", self.bind_addr);
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graceful.await?;
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}
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Ok(())
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}
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}
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