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