2020-04-06 17:55:39 +00:00
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use std::net::SocketAddr;
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use std::sync::Arc;
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use std::time::Duration;
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2020-04-05 21:33:42 +00:00
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use bytes::IntoBuf;
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use hyper::service::{make_service_fn, service_fn};
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2020-04-06 17:55:39 +00:00
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use hyper::server::conn::AddrStream;
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2020-04-05 21:33:42 +00:00
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use hyper::{Body, Method, Request, Response, Server, StatusCode};
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use futures::future::Future;
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2020-04-06 17:55:39 +00:00
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use futures::stream::futures_unordered::FuturesUnordered;
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use futures::stream::StreamExt;
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2020-04-05 21:33:42 +00:00
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2020-04-06 17:55:39 +00:00
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use crate::data::*;
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2020-04-05 21:33:42 +00:00
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use crate::error::Error;
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use crate::proto::Message;
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2020-04-06 17:55:39 +00:00
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use crate::membership::System;
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use crate::membership;
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// ---- CLIENT PART ----
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pub async fn rpc_call_many(sys: Arc<System>,
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to: &[UUID],
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msg: &Message,
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stop_after: Option<usize>,
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timeout: Duration)
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-> Vec<Result<Message, Error>>
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{
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let resp_stream = to.iter()
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.map(|to| rpc_call(sys.clone(), to, msg, timeout))
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.collect::<FuturesUnordered<_>>();
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collect_rpc_results(resp_stream, stop_after).await
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}
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pub async fn rpc_call_many_addr(sys: Arc<System>,
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to: &[SocketAddr],
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msg: &Message,
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stop_after: Option<usize>,
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timeout: Duration)
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-> Vec<Result<Message, Error>>
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{
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let resp_stream = to.iter()
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.map(|to| rpc_call_addr(sys.clone(), to, msg, timeout))
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.collect::<FuturesUnordered<_>>();
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collect_rpc_results(resp_stream, stop_after).await
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}
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async fn collect_rpc_results(mut resp_stream: FuturesUnordered<impl Future<Output=Result<Message, Error>>>,
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stop_after: Option<usize>)
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-> Vec<Result<Message, Error>>
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{
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let mut results = vec![];
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let mut n_ok = 0;
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while let Some(resp) = resp_stream.next().await {
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if resp.is_ok() {
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n_ok += 1
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}
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results.push(resp);
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if let Some(n) = stop_after {
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if n_ok >= n {
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break
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}
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}
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}
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results
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}
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// ----
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2020-04-05 21:33:42 +00:00
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2020-04-06 17:55:39 +00:00
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pub async fn rpc_call(sys: Arc<System>,
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to: &UUID,
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msg: &Message,
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timeout: Duration)
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-> Result<Message, Error>
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{
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let addr = {
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let members = sys.members.read().await;
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match members.status.get(to) {
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Some(status) => status.addr.clone(),
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None => return Err(Error::Message(format!("Peer ID not found"))),
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}
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};
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rpc_call_addr(sys, &addr, msg, timeout).await
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}
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2020-04-05 21:33:42 +00:00
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2020-04-06 17:55:39 +00:00
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pub async fn rpc_call_addr(sys: Arc<System>,
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to_addr: &SocketAddr,
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msg: &Message,
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timeout: Duration)
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-> Result<Message, Error>
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{
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let uri = format!("http://{}/", to_addr);
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let req = Request::builder()
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.method(Method::POST)
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.uri(uri)
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.body(Body::from(rmp_serde::encode::to_vec_named(msg)?))?;
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let resp_fut = sys.rpc_client.request(req);
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let resp = tokio::time::timeout(timeout, resp_fut).await??;
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if resp.status() == StatusCode::OK {
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let body = hyper::body::to_bytes(resp.into_body()).await?;
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let msg = rmp_serde::decode::from_read::<_, Message>(body.into_buf())?;
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match msg {
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Message::Error(e) => Err(Error::RPCError(e)),
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x => Ok(x)
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}
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} else {
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Err(Error::RPCError(format!("Status code {}", resp.status())))
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}
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}
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// ---- SERVER PART ----
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fn err_to_msg(x: Result<Message, Error>) -> Message {
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match x {
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Err(e) => Message::Error(format!("{}", e)),
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Ok(msg) => msg,
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}
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}
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async fn handler(sys: Arc<System>, req: Request<Body>, addr: SocketAddr) -> Result<Response<Body>, Error> {
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2020-04-05 21:33:42 +00:00
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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 whole_body = hyper::body::to_bytes(req.into_body()).await?;
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2020-04-06 17:55:39 +00:00
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let msg = rmp_serde::decode::from_read::<_, Message>(whole_body.into_buf())?;
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eprintln!("RPC from {}: {:?}", addr, msg);
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let resp = err_to_msg(match &msg {
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Message::Ping(ping) => membership::handle_ping(sys, &addr, ping).await,
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Message::AdvertiseNode(adv) => membership::handle_advertise_node(sys, adv).await,
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_ => Ok(Message::Error(format!("Unexpected message: {:?}", msg))),
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});
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2020-04-05 21:33:42 +00:00
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Ok(Response::new(Body::from(
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rmp_serde::encode::to_vec_named(&resp)?
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)))
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}
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2020-04-06 17:55:39 +00:00
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pub async fn run_rpc_server(sys: Arc<System>, shutdown_signal: impl Future<Output=()>) -> Result<(), hyper::Error> {
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let bind_addr = ([0, 0, 0, 0], sys.config.rpc_port).into();
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2020-04-05 21:33:42 +00:00
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2020-04-06 17:55:39 +00:00
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let service = make_service_fn(|conn: &AddrStream| {
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let client_addr = conn.remote_addr();
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let sys = sys.clone();
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async move {
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Ok::<_, Error>(service_fn(move |req: Request<Body>| {
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let sys = sys.clone();
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handler(sys, req, client_addr)
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}))
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}
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});
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2020-04-05 21:33:42 +00:00
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2020-04-06 17:55:39 +00:00
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let server = Server::bind(&bind_addr).serve(service) ;
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2020-04-05 21:33:42 +00:00
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let graceful = server.with_graceful_shutdown(shutdown_signal);
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2020-04-06 17:55:39 +00:00
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println!("RPC server listening on http://{}", bind_addr);
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2020-04-05 21:33:42 +00:00
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graceful.await
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}
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