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"0.3.18", features = ["env-filter"] } +uuid = { version = "1.11.0", features = ["v4"] } diff --git a/README.md b/README.md new file mode 100644 index 0000000..b0baea7 --- /dev/null +++ b/README.md @@ -0,0 +1,8 @@ +# cerulea-relay + +Realtime relay (1hr backfill window) for PDSes with fewer than 1000 repos. + +The idea is that we can have much larger limits if we scale down the volume of the network. +- Large block sizes +- Large record size limit +- etcetcetc diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..163d56f --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,4 @@ +pub mod prelude; + +pub mod relay_subscription; +pub mod server; diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..14a480a --- /dev/null +++ b/src/main.rs @@ -0,0 +1,21 @@ +use anyhow::Result; +use std::{net::SocketAddr, sync::Arc}; +use tracing_subscriber::{fmt, prelude::*, EnvFilter}; + +use cerulea_relay::server::{self, RelayServer}; + +#[tokio::main] +async fn main() -> Result<()> { + tracing_subscriber::registry() + .with(fmt::layer()) + .with(EnvFilter::from_default_env()) + .init(); + + let server = Arc::new(RelayServer::default()); + + // TODO: scrape some dudes + + let addr = SocketAddr::from(([127, 0, 0, 1], 3000)); + server::listen(Arc::clone(&server), addr).await?; + Ok(()) +} diff --git a/src/prelude.rs b/src/prelude.rs new file mode 100644 index 0000000..4024d7b --- /dev/null +++ b/src/prelude.rs @@ -0,0 +1 @@ +pub use tap::prelude::*; diff --git a/src/relay_subscription.rs b/src/relay_subscription.rs new file mode 100644 index 0000000..35b79ee --- /dev/null +++ b/src/relay_subscription.rs @@ -0,0 +1,183 @@ +use crate::prelude::*; + +use std::sync::Arc; + +use anyhow::Result; +use fastwebsockets::{ + upgrade::{is_upgrade_request, upgrade}, + FragmentCollectorRead, Frame, OpCode, Payload, WebSocket, WebSocketError, WebSocketWrite, +}; +use hyper::{ + body::{Bytes, Incoming}, + upgrade::Upgraded, + Request, Response, StatusCode, +}; +use hyper_util::rt::TokioIo; +use qstring::QString; +use tokio::{ + net::{ + tcp::{OwnedReadHalf, OwnedWriteHalf}, + TcpStream, + }, + sync::broadcast::{error::RecvError, Receiver}, +}; +use uuid::Uuid; + +use crate::server::{empty, full, RelayServer, ServerResponse}; + +enum Operation<'f> { + NoOp, + WriteBlock(Bytes), + WriteFrame(Frame<'f>), + ExitWithFrame(Frame<'f>), + Exit, +} + +struct RelaySubscription { + id: Uuid, + running: bool, +} + +type WSRead = FragmentCollectorRead; +type WSWrite = WebSocketWrite; + +impl RelaySubscription { + fn create(mut ws: WebSocket>) -> (Self, WSRead, WSWrite) { + ws.set_auto_close(false); + ws.set_auto_pong(false); + + let (ws_rx, ws_tx) = ws.split(|stream| { + let upgraded = stream.into_inner(); + let parts = upgraded.downcast::>().expect("uhhhh"); + let (read, write) = parts.io.into_inner().into_split(); + (read, write) + }); + let ws_rx = FragmentCollectorRead::new(ws_rx); + + let sub = RelaySubscription { + id: Uuid::new_v4(), + running: true, + }; + + (sub, ws_rx, ws_tx) + } + + async fn dispatch_operation(&mut self, ws_tx: &mut WSWrite, op: Operation<'_>) { + if let Err(e) = match op { + Operation::NoOp => return, + Operation::WriteBlock(bytes) => { + ws_tx + .write_frame(Frame::binary(Payload::Borrowed(&bytes))) + .await + } + Operation::WriteFrame(frame) => ws_tx.write_frame(frame).await, + Operation::ExitWithFrame(frame) => { + let _ = ws_tx.write_frame(frame).await; + self.running = false; + return; + } + Operation::Exit => { + self.running = false; + return; + } + } { + tracing::warn!("Encountered error: {:?}", e); + self.running = false; + } + } +} + +async fn read_frame<'f>(ws_rx: &mut WSRead) -> Operation<'f> { + match ws_rx + .read_frame::<_, WebSocketError>(&mut move |_| async { + unreachable!() // it'll be fiiiine :3 + }) + .await + { + Ok(frame) if frame.opcode == OpCode::Ping => { + Operation::WriteFrame(Frame::pong(frame.payload)) + } + Ok(frame) if frame.opcode == OpCode::Close => { + Operation::ExitWithFrame(Frame::close_raw(frame.payload)) + } + Ok(_frame) => { + Operation::NoOp // discard + } + Err(_e) => Operation::Exit, + } +} + +async fn rebroadcast_block<'f>(block_rx: &mut Receiver) -> Operation<'f> { + match block_rx.recv().await { + Ok(block) => Operation::WriteBlock(block), + Err(RecvError::Closed) => Operation::ExitWithFrame(Frame::close(1001, b"Going away")), + Err(RecvError::Lagged(_)) => { + Operation::ExitWithFrame(Frame::close(1008, b"Client too slow")) + } + } +} + +async fn run_subscription( + server: Arc, + req: Request, + ws: WebSocket>, +) { + let query = req.uri().query().map(QString::from); + let cursor: Option = query + .as_ref() + .and_then(|q| q.get("cursor")) + .and_then(|s| s.parse().ok()); + + let (mut sub, mut ws_rx, mut ws_tx) = RelaySubscription::create(ws); + + tracing::debug!(id = %sub.id, "subscription started"); + + if let Some(_cursor) = cursor { + tracing::debug!(id = %sub.id, "filling from event cache"); + + // TODO: cursor catchup + + tracing::debug!(id = %sub.id, "subscription live-tailing"); + } + + // live tailing: + let mut block_rx = server.block_tx.subscribe(); + while sub.running { + let op = tokio::select! { + biased; + op = rebroadcast_block(&mut block_rx) => op, + op = read_frame(&mut ws_rx) => op, + }; + sub.dispatch_operation(&mut ws_tx, op).await; + } + + tracing::debug!(id = %sub.id, "subscription ended"); +} + +pub async fn handle_subscription( + server: Arc, + mut req: Request, +) -> Result { + if !is_upgrade_request(&req) { + return Response::builder() + .status(StatusCode::UPGRADE_REQUIRED) + .body(full("Upgrade Required"))? + .pipe(Ok); + } + + let (res, ws_fut) = upgrade(&mut req)?; + tokio::task::spawn(async move { + let ws = match ws_fut.await { + Ok(ws) => ws, + Err(e) => { + tracing::warn!("error upgrading WebSocket: {e:?}"); + return; + } + }; + + run_subscription(server, req, ws).await; + }); + + let (head, _) = res.into_parts(); + Ok(Response::from_parts(head, empty())) +} diff --git a/src/server.rs b/src/server.rs new file mode 100644 index 0000000..bf49bd2 --- /dev/null +++ b/src/server.rs @@ -0,0 +1,79 @@ +use crate::{prelude::*, relay_subscription::handle_subscription}; + +use std::{net::SocketAddr, sync::Arc}; + +use anyhow::Result; +use http_body_util::{combinators::BoxBody, BodyExt, Empty, Full}; +use hyper::{ + body::{Bytes, Incoming}, + service::service_fn, + Method, Request, Response, StatusCode, +}; +use hyper_util::rt::TokioIo; +use tokio::net::TcpListener; + +pub struct RelayServer { + pub block_tx: tokio::sync::broadcast::Sender, +} + +impl Default for RelayServer { + fn default() -> Self { + let (block_tx, _) = tokio::sync::broadcast::channel::(128); + Self { block_tx } + } +} + +pub type ServerResponseBody = BoxBody; +pub fn empty() -> ServerResponseBody { + Empty::::new().map_err(|e| match e {}).boxed() +} +pub fn full>(chunk: T) -> ServerResponseBody { + Full::new(chunk.into()).map_err(|e| match e {}).boxed() +} + +pub type ServerResponse = Response>; + +async fn serve(server: Arc, req: Request) -> Result { + let path = req.uri().path(); + + tracing::debug!("{}", path); + + match (req.method(), path) { + (&Method::GET, "/") => Response::builder() + .status(StatusCode::OK) + .header("Content-Type", "text/plain") + .body(full("cerulea relay running..."))? + .pipe(Ok), + + (&Method::GET, "/xrpc/com.atproto.sync.subscribeRepos") => { + handle_subscription(server, req).await + } + + _ => Response::builder() + .status(StatusCode::NOT_FOUND) + .header("Content-Type", "text/plain") + .body(full("Not Found"))? + .pipe(Ok), + } +} + +pub async fn listen(server: Arc, addr: SocketAddr) -> Result<()> { + tracing::info!("Listening on: http://{addr}/ ..."); + + let listener = TcpListener::bind(addr).await?; + + loop { + let (stream, _client_addr) = listener.accept().await?; + let io = TokioIo::new(stream); + let server = Arc::clone(&server); + tokio::task::spawn(async move { + if let Err(err) = hyper::server::conn::http1::Builder::new() + .serve_connection(io, service_fn(move |req| serve(Arc::clone(&server), req))) + .with_upgrades() + .await + { + eprintln!("Error handling connection: {err:?}") + } + }); + } +}