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(x: T) -> String { match serde_json::to_string(&x) { Ok(ss) => { if ss.len() > 100 { ss[..100].to_string() } else { ss } } Err(e) => format!("", e), } } fn err_to_msg(x: Result) -> Message { match x { Err(e) => Message::Error(format!("{}", e)), Ok(msg) => msg, } } async fn handler( garage: Arc, req: Request, addr: SocketAddr, ) -> Result, 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, shutdown_signal: impl Future, ) -> 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| { 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(()) }