use std::net::SocketAddr;
use std::sync::Arc;
use bytes::IntoBuf;
use futures::future::Future;
use futures_util::future::*;
use hyper::server::conn::AddrStream;
use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Method, Request, Response, Server, StatusCode};
use serde::Serialize;
use crate::data::rmp_to_vec_all_named;
use crate::error::Error;
use crate::proto::Message;
use crate::server::Garage;
fn debug_serialize<T: Serialize>(x: T) -> String {
match serde_json::to_string(&x) {
Ok(ss) => {
if ss.len() > 100 {
ss[..100].to_string()
} else {
ss
}
}
Err(e) => format!("<JSON serialization error: {}>", e),
}
}
fn err_to_msg(x: Result<Message, Error>) -> Message {
match x {
Err(e) => Message::Error(format!("{}", e)),
Ok(msg) => msg,
}
}
async fn handler(
garage: Arc<Garage>,
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 {}: {} ({} bytes)",
addr,
debug_serialize(&msg),
whole_body.len()
);
let sys = garage.system.clone();
let resp = err_to_msg(match msg {
Message::Ping(ping) => sys.handle_ping(&addr, &ping).await,
Message::PullStatus => sys.handle_pull_status(),
Message::PullConfig => sys.handle_pull_config(),
Message::AdvertiseNodesUp(adv) => sys.handle_advertise_nodes_up(&adv).await,
Message::AdvertiseConfig(adv) => sys.handle_advertise_config(&adv).await,
Message::PutBlock(m) => {
// A RPC can be interrupted in the middle, however we don't want to write partial blocks,
// which might happen if the write_block() future is cancelled in the middle.
// To solve this, the write itself is in a spawned task that has its own separate lifetime,
// and the request handler simply sits there waiting for the task to finish.
// (if it's cancelled, that's not an issue)
// (TODO FIXME except if garage happens to shut down at that point)
let write_fut = async move {
garage.block_manager.write_block(&m.hash, &m.data).await
};
tokio::spawn(write_fut).await?
}
Message::GetBlock(h) => garage.block_manager.read_block(&h).await,
Message::TableRPC(table, msg) => {
// For now, table RPCs use transactions that are not async so even if the future
// is canceled, the db should be in a consistent state.
if let Some(rpc_handler) = garage.table_rpc_handlers.get(&table) {
rpc_handler
.handle(&msg[..])
.await
.map(|rep| Message::TableRPC(table.to_string(), rep))
} else {
Ok(Message::Error(format!("Unknown table: {}", table)))
}
}
_ => Ok(Message::Error(format!("Unexpected message: {:?}", msg))),
});
eprintln!("reply to {}: {}", addr, debug_serialize(&resp));
Ok(Response::new(Body::from(rmp_to_vec_all_named(&resp)?)))
}
pub async fn run_rpc_server(
garage: Arc<Garage>,
shutdown_signal: impl Future<Output = ()>,
) -> Result<(), Error> {
let bind_addr = ([0, 0, 0, 0, 0, 0, 0, 0], garage.system.config.rpc_port).into();
let service = make_service_fn(|conn: &AddrStream| {
let client_addr = conn.remote_addr();
let garage = garage.clone();
async move {
Ok::<_, Error>(service_fn(move |req: Request<Body>| {
let garage = garage.clone();
handler(garage, req, client_addr).map_err(|e| {
eprintln!("RPC handler error: {}", e);
e
})
}))
}
});
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?;
Ok(())
}
