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Preconnect RPC server to reduce cache miss latency
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,163 @@ | ||
| use std::{ | ||
| io::{ | ||
| Error as IoError, | ||
| ErrorKind::{AddrNotAvailable, InvalidInput, TimedOut}, | ||
| }, | ||
| net::ToSocketAddrs, | ||
| sync::Arc, | ||
| time::Duration, | ||
| }; | ||
|
|
||
| use actix_web::web::Bytes; | ||
| use hyper::{client::conn::handshake, http::Error as HttpError, Body, Request, Response}; | ||
| use log::{debug, error}; | ||
| use parking_lot::Mutex; | ||
| use rand::{seq::IteratorRandom, thread_rng}; | ||
| use reqwest::{IntoUrl, Url}; | ||
| use socket2::{SockRef, TcpKeepalive}; | ||
| use tokio::{ | ||
| net::{TcpSocket, TcpStream}, | ||
| task::AbortHandle, | ||
| time::timeout, | ||
| }; | ||
|
|
||
| use crate::CLIENT_VERSION; | ||
|
|
||
| type RequestError = Box<dyn std::error::Error + Send + Sync>; | ||
|
|
||
| #[derive(Default)] | ||
| pub struct RPCHttpClient { | ||
| timeout: Duration, | ||
| preconnect: Arc<Mutex<Option<(String, TcpStream)>>>, | ||
| connecting: Mutex<Option<AbortHandle>>, | ||
| } | ||
|
|
||
| impl RPCHttpClient { | ||
| pub fn new(timeout: Duration) -> Self { | ||
| Self { | ||
| timeout, | ||
| ..Default::default() | ||
| } | ||
| } | ||
|
|
||
| pub async fn get<U: IntoUrl>(&self, url: U) -> Result<Response<Body>, RequestError> { | ||
| let url = url.into_url()?; | ||
| let host = url.host().ok_or(IoError::new(InvalidInput, "uri has no host"))?; | ||
| let port = url.port().unwrap_or_else(|| if url.scheme() == "https" { 443 } else { 80 }); | ||
| let server = format!("{host}:{port}"); | ||
|
|
||
| let conn = self.preconnect.lock().take(); | ||
| let conn = match conn.and_then(|(key, stream)| if key == server { Some(stream) } else { None }) { | ||
| Some(v) => { | ||
| // Connection timeout 5s | ||
| match timeout(Duration::from_secs(5), v.writable()).await { | ||
| Ok(Ok(_)) => v, | ||
| _ => create_stream(&server).await?, | ||
| } | ||
| } | ||
| None => create_stream(&server).await?, | ||
| }; | ||
| let (mut sender, conn) = handshake(conn).await?; | ||
| // spawn a task to poll the connection and drive the HTTP state | ||
| tokio::spawn(async move { | ||
| if let Err(e) = conn.await { | ||
| error!("Error in connection: {}", e); | ||
| } | ||
| }); | ||
|
|
||
| match timeout(self.timeout, sender.send_request(build_request(&url)?)).await.ok() { | ||
| Some(v) => { | ||
| self.preconnect(&server); | ||
| v.map_err(|e| e.into()) | ||
| } | ||
| None => Err(Box::new(IoError::new(TimedOut, format!("Request timeout: url={}", url)))), | ||
| } | ||
| } | ||
|
|
||
| pub fn preconnect(&self, server: &str) { | ||
| // Connected | ||
| if self.preconnect.lock().is_some() { | ||
| return; | ||
| } | ||
| // Connecting | ||
| let mut job = self.connecting.lock(); | ||
| if !job.as_ref().map_or(true, |job| job.is_finished()) { | ||
| return; | ||
| } | ||
|
|
||
| let server = server.to_owned(); | ||
| let preconnect = Arc::downgrade(&self.preconnect); | ||
| job.replace( | ||
| tokio::spawn(async move { | ||
| debug!("Preconnecting to {}", server); | ||
| match create_stream(&server).await { | ||
| Ok(stream) => { | ||
| debug!("Preconnected to {}", server); | ||
| if let Some(preconnect) = preconnect.upgrade() { | ||
| preconnect.lock().replace((server.to_owned(), stream)); | ||
| } | ||
| } | ||
| Err(err) => debug!("Pre connect error: {}", err), | ||
| } | ||
| }) | ||
| .abort_handle(), | ||
| ); | ||
| } | ||
|
|
||
| pub async fn check_status(&self, res: Response<Body>) -> Result<Response<Body>, RequestError> { | ||
| let status = res.status(); | ||
| if status.is_client_error() || status.is_server_error() { | ||
| Err(crate::error::Error::ServerError { | ||
| status: res.status().as_u16(), | ||
| body: self.to_bytes(res).await.ok().and_then(|b| String::from_utf8(b.to_vec()).ok()), | ||
| } | ||
| .into()) | ||
| } else { | ||
| Ok(res) | ||
| } | ||
| } | ||
|
|
||
| pub async fn to_text(&self, res: Response<Body>) -> Result<String, RequestError> { | ||
| Ok(String::from_utf8(self.to_bytes(res).await?.to_vec())?) | ||
| } | ||
|
|
||
| pub async fn to_bytes(&self, res: Response<Body>) -> Result<Bytes, RequestError> { | ||
| match timeout(self.timeout, hyper::body::to_bytes(res.into_body())).await.ok() { | ||
| Some(v) => Ok(v?), | ||
| None => Err(Box::new(IoError::new(TimedOut, "Read response timeout".to_string()))), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| async fn create_stream(server: &str) -> Result<TcpStream, IoError> { | ||
| if let Ok(addrs) = server.to_socket_addrs() { | ||
| let addr = addrs | ||
| .choose(&mut thread_rng()) | ||
| .ok_or(IoError::new(AddrNotAvailable, format!("Fail to resolve {}", server)))?; | ||
|
|
||
| // Socket settings | ||
| let socket = if addr.is_ipv4() { TcpSocket::new_v4() } else { TcpSocket::new_v6() }?; | ||
| let socket2 = SockRef::from(&socket); | ||
| let keepalive = TcpKeepalive::new() | ||
| .with_time(Duration::from_secs(30)) | ||
| .with_interval(Duration::from_secs(15)); | ||
| let _ = socket2.set_tcp_keepalive(&keepalive); | ||
| let _ = socket2.set_nodelay(true); | ||
|
|
||
| // Connect | ||
| match timeout(Duration::from_secs(5), socket.connect(addr)).await.ok() { | ||
| Some(r) => r, | ||
| None => Err(IoError::new(TimedOut, format!("Connect timeout: addr={addr}"))), | ||
| } | ||
| } else { | ||
| Err(IoError::new(InvalidInput, format!("Fail parse host {}", server))) | ||
| } | ||
| } | ||
|
|
||
| fn build_request(url: &Url) -> Result<Request<Body>, HttpError> { | ||
| Request::builder() | ||
| .header("Host", url.host_str().unwrap()) | ||
| .header("User-Agent", format!("Hentai@Home {CLIENT_VERSION}")) | ||
| .uri(url.as_str()) | ||
| .body(Body::empty()) | ||
| } |