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mod read_proxy;mod write_proxy;
pub use read_proxy::ReadCacheProxy;pub use write_proxy::WriteCacheProxy;
const UPLOAD_QUEUE_CAPACITY: usize = 128;const CONNECTION_WORKERS: usize = 4;const CACHE_ENQUEUE_IO_TIMEOUT: Duration = Duration::from_secs(2);const DEFAULT_CACHE_ENQUEUE_PORT: u32 = 10241;const SHUTTLE_CACHE_ENQUEUE_PORT_ENV: &str = "SHUTTLE_CACHE_VSOCK_PORT";const NIX_BUILD_GROUP: &str = "nixbld";const SPINDLE_HOOK_TOKEN: &str = "/run/spindle/hook-token";
#[derive(Clone, Debug, Default)]pub struct CacheStats { pub pending: u32, pub active: u32, pub uploaded: u32, pub failed: u32, pub last_error: Option<String>,}
#[derive(Debug, Default)]struct CacheState { stats: CacheStats, enqueue_active: u32, stopped: bool,}
impl CacheState { fn snapshot(&self) -> CacheSnapshot { CacheSnapshot { stats: self.stats.clone(), enqueue_active: self.enqueue_active, stopped: self.stopped, } }}
#[derive(Clone, Debug, Default)]struct CacheSnapshot { stats: CacheStats, enqueue_active: u32, stopped: bool,}
impl CacheSnapshot { fn is_idle(&self) -> bool { self.stats.pending == 0 && self.stats.active == 0 && self.enqueue_active == 0 }}
#[derive(Clone)]pub struct CacheUploadManager { inner: Arc<CacheUploadInner>,}
struct CacheUploadInner { cmd_tx: mpsc::Sender<Cmd>, stats_rx: watch::Receiver<CacheSnapshot>, handles: Mutex<Vec<JoinHandle<()>>>,}
struct UploadJob { paths: Vec<String>, count: u32,}
enum Cmd { EnqueueStarted, EnqueueFinished, Enqueue { paths: Vec<String>, reply: oneshot::Sender<Result<usize, String>>, }, UploadStarted { count: u32, }, UploadFinished { count: u32, error: Option<String>, }, UploadWorkerStopped, Stop,}
impl CacheUploadManager { pub async fn start(upload_url: &str, event_tx: mpsc::Sender<Message>) -> Result<Option<Self>> { if upload_url.is_empty() { // nothing to upload to, so don't require the guest-local vsock // listener (vsock_loopback) or the nix post-build hook info!("no cache upload url configured, cache uploads disabled"); return Ok(None); } let token = create_hook_token().context("create cache hook token")?; let port = cache_enqueue_port(); let listener = VsockListener::bind(VsockAddr::new(VMADDR_CID_LOCAL, port)) .with_context(|| format!("listen on guest-local vsock port {port}"))?;
let (cmd_tx, cmd_rx) = mpsc::channel::<Cmd>(UPLOAD_QUEUE_CAPACITY); let (upload_tx, upload_rx) = mpsc::channel::<UploadJob>(UPLOAD_QUEUE_CAPACITY); let (stats_tx, stats_rx) = watch::channel(CacheSnapshot::default());
let mut handles = Vec::with_capacity(3);
handles.push(tokio::spawn(async move { cache_manager_loop(cmd_rx, upload_tx, stats_tx).await; }));
let upload_cmd_tx = cmd_tx.clone(); let upload_url = upload_url.to_owned(); handles.push(tokio::spawn(async move { upload_loop(upload_rx, upload_cmd_tx, upload_url).await; }));
let accept_cmd_tx = cmd_tx.clone(); handles.push(tokio::spawn(async move { accept_loop(listener, token, event_tx, accept_cmd_tx).await; }));
info!( port, workers = CONNECTION_WORKERS, "cache upload queue ready" ); let inner = Arc::new(CacheUploadInner { cmd_tx, stats_rx, handles: Mutex::new(handles), }); Ok(Some(Self { inner })) }
pub async fn drain(&self, timeout: Option<Duration>) -> CacheStats { let mut stats_rx = self.inner.stats_rx.clone(); let wait = async { loop { let snapshot = stats_rx.borrow_and_update().clone(); if snapshot.is_idle() || snapshot.stopped { return snapshot.stats; } if stats_rx.changed().await.is_err() { let mut stats = stats_rx.borrow().stats.clone(); stats.last_error = Some("cache manager stopped".to_owned()); return stats; } } };
match timeout { Some(timeout) => match tokio::time::timeout(timeout, wait).await { Ok(stats) => stats, Err(_) => { let mut stats = self.inner.stats_rx.borrow().stats.clone(); stats.last_error = Some("cache drain timed out".to_owned()); stats } }, None => wait.await, } }}
impl Drop for CacheUploadInner { fn drop(&mut self) { let _ = self.cmd_tx.try_send(Cmd::Stop); if let Ok(mut handles) = self.handles.lock() { for handle in handles.drain(..) { handle.abort(); } } let _ = fs::remove_file(SPINDLE_HOOK_TOKEN); }}
#[derive(Debug, Deserialize, Serialize)]struct EnqueueBuiltPathsRequest { token: String, paths: Vec<String>,}
#[derive(Debug, Deserialize, Serialize)]struct EnqueueBuiltPathsResponse { queued: usize, #[serde(default, skip_serializing_if = "String::is_empty")] error: String,}
#[derive(Debug)]enum JsonLineError { Empty, TimedOut, Io(io::Error), Json(serde_json::Error),}
impl JsonLineError { fn enqueue_request_message(self) -> String { match self { Self::Empty => "empty cache enqueue request".to_owned(), Self::TimedOut => "cache enqueue read timed out".to_owned(), Self::Io(error) => error.to_string(), Self::Json(error) => error.to_string(), } }}
impl fmt::Display for JsonLineError { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { match self { Self::Empty => f.write_str("empty message"), Self::TimedOut => f.write_str("timed out"), Self::Io(error) => error.fmt(f), Self::Json(error) => error.fmt(f), } }}
async fn cache_manager_loop( mut cmd_rx: mpsc::Receiver<Cmd>, upload_tx: mpsc::Sender<UploadJob>, stats_tx: watch::Sender<CacheSnapshot>,) { let mut state = CacheState::default();
let publish_state = |state: &CacheState| { let _ = stats_tx.send(state.snapshot()); };
while let Some(command) = cmd_rx.recv().await { match command { Cmd::EnqueueStarted => { state.enqueue_active += 1; publish_state(&state); } Cmd::EnqueueFinished => { decrement_counter(&mut state.enqueue_active, 1, "cache enqueue active"); publish_state(&state); } Cmd::Enqueue { paths, reply } => { let result = enqueue_upload_job(&mut state, &upload_tx, paths); publish_state(&state); let _ = reply.send(result); } Cmd::UploadStarted { count } => { decrement_counter(&mut state.stats.pending, count, "cache pending uploads"); state.stats.active += count; publish_state(&state); } Cmd::UploadFinished { count, error } => { decrement_counter(&mut state.stats.active, count, "cache active uploads"); if let Some(error) = error { state.stats.failed += count; state.stats.last_error = Some(error); } else { state.stats.uploaded += count; } publish_state(&state); } Cmd::UploadWorkerStopped => { state.stopped = true; publish_state(&state); } Cmd::Stop => { state.stopped = true; publish_state(&state); break; } } }
state.stopped = true; publish_state(&state);}
fn enqueue_upload_job( state: &mut CacheState, upload_tx: &mpsc::Sender<UploadJob>, paths: Vec<String>,) -> Result<usize, String> { if state.stopped { return Err("cache manager stopped".to_owned()); }
let count = paths.len() as u32; if count == 0 { return Ok(0); }
match upload_tx.try_send(UploadJob { paths, count }) { Ok(()) => { state.stats.pending += count; Ok(count as usize) } Err(mpsc::error::TrySendError::Full(_)) => Err("cache upload queue is full".to_owned()), Err(mpsc::error::TrySendError::Closed(_)) => { state.stopped = true; Err("cache upload worker stopped".to_owned()) } }}
fn decrement_counter(counter: &mut u32, count: u32, name: &'static str) { match counter.checked_sub(count) { Some(value) => *counter = value, None => { warn!(name, current = *counter, count, "cache counter underflow"); *counter = 0; } }}
async fn upload_loop( mut upload_rx: mpsc::Receiver<UploadJob>, cmd_tx: mpsc::Sender<Cmd>, upload_url: String,) { while let Some(job) = upload_rx.recv().await { let cmd = Cmd::UploadStarted { count: job.count }; if cmd_tx.send(cmd).await.is_err() { break; }
let error = upload_paths(&upload_url, &job.paths) .await .err() .map(|error| error.to_string());
let cmd = Cmd::UploadFinished { count: job.count, error, }; if cmd_tx.send(cmd).await.is_err() { break; } }
let _ = cmd_tx.send(Cmd::UploadWorkerStopped).await;}
// runs nix copy against the write cache proxy, which goes to the spindle// and spindle will then forward the request to the actual binary cacheasync fn upload_paths(upload_url: &str, paths: &[String]) -> Result<()> { fn add_query_param(url: &str, key: &str, value: &str) -> String { let separator = url.contains('?').then_some('&').unwrap_or('?'); format!("{}{}{}={}", url, separator, key, value) }
if paths.is_empty() || upload_url.is_empty() { return Ok(()); }
// we use zstd 3 because its the best usually. it is faster than no // compression also because of IO savings let dest_url = add_query_param(upload_url, "compression", "zstd"); let dest_url = add_query_param(&dest_url, "compression-level", "3"); let dest_url = add_query_param(&dest_url, "parallel-compression", "true");
let spec = Spec::new(nix_executable()) .args(["copy", "--to", &dest_url]) .args(paths.iter().cloned()) .timeout(Duration::from_secs(10 * 60));
let output = command::run_capture(spec).await.context("run nix copy")?; if !output.success() { anyhow::bail!( "nix copy failed: exit={} error={:?} output={}", output.exit.exit_code, output.exit.error, output.combined_lossy(), ); }
info!(paths = paths.len(), %upload_url, "uploaded cache paths"); Ok(())}
async fn accept_loop( listener: VsockListener, token: String, event_tx: mpsc::Sender<Message>, cmd_tx: mpsc::Sender<Cmd>,) { let permits = Arc::new(Semaphore::new(CONNECTION_WORKERS)); let mut tasks = JoinSet::new(); loop { tokio::select! { accepted = listener.accept() => match accepted { Ok((conn, _addr)) => { let Ok(permit) = permits.clone().try_acquire_owned() else { tasks.spawn(async move { let mut conn = conn; write_enqueue_response( &mut conn, 0, Some("cache enqueue workers are busy".to_owned()), ) .await; }); warn!("cache enqueue dropped because workers are busy"); continue; };
let worker_cmd_tx = cmd_tx.clone(); if let Err(error) = start_enqueue_request(&worker_cmd_tx) { tasks.spawn(async move { let mut conn = conn; write_enqueue_response(&mut conn, 0, Some(error)).await; }); continue; }
let worker_token = token.clone(); let worker_event_tx = event_tx.clone(); tasks.spawn(async move { let _permit = permit; handle_enqueue_conn( conn, &worker_token, &worker_event_tx, &worker_cmd_tx, ) .await; let _ = worker_cmd_tx.send(Cmd::EnqueueFinished).await; }); } Err(error) => { if error.kind() != io::ErrorKind::Interrupted { warn!(%error, "cache enqueue accept failed"); } } }, Some(result) = tasks.join_next(), if !tasks.is_empty() => { log_enqueue_task_result(result); } } }}
fn log_enqueue_task_result(result: Result<(), JoinError>) { if let Err(error) = result { warn!(%error, "cache enqueue task failed"); }}
async fn handle_enqueue_conn( mut conn: VsockStream, expected_token: &str, event_tx: &mpsc::Sender<Message>, cmd_tx: &mpsc::Sender<Cmd>,) { let req: EnqueueBuiltPathsRequest = match read_enqueue_request(&mut conn).await { Ok(req) => req, Err(error) => { write_enqueue_response(&mut conn, 0, Some(error)).await; return; } };
if req.token != expected_token { write_enqueue_response(&mut conn, 0, Some("invalid cache enqueue token".to_owned())).await; return; }
match enqueue_paths(cmd_tx, req.paths).await { Ok(queued) => { send_built_paths_event(event_tx, queued.event_paths).await; write_enqueue_response(&mut conn, queued.count, None).await; } Err(error) => write_enqueue_response(&mut conn, 0, Some(error)).await, }}
fn start_enqueue_request(cmd_tx: &mpsc::Sender<Cmd>) -> Result<(), String> { match cmd_tx.try_send(Cmd::EnqueueStarted) { Ok(()) => Ok(()), Err(mpsc::error::TrySendError::Full(_)) => Err("cache upload queue is full".to_owned()), Err(mpsc::error::TrySendError::Closed(_)) => Err("cache upload worker stopped".to_owned()), }}
async fn read_enqueue_request(conn: &mut VsockStream) -> Result<EnqueueBuiltPathsRequest, String> { read_json_line(conn) .await .map_err(JsonLineError::enqueue_request_message)}
async fn read_json_line<T>(conn: &mut VsockStream) -> Result<T, JsonLineError>where T: DeserializeOwned,{ let mut data = Vec::new(); let mut reader = BufReader::new(conn); let bytes_read = tokio::time::timeout( CACHE_ENQUEUE_IO_TIMEOUT, reader.read_until(b'\n', &mut data), ) .await .map_err(|_| JsonLineError::TimedOut)? .map_err(JsonLineError::Io)?;
if bytes_read == 0 { return Err(JsonLineError::Empty); }
serde_json::from_slice(&data).map_err(JsonLineError::Json)}
struct QueuedPaths { count: usize, event_paths: Vec<String>,}
async fn enqueue_paths( cmd_tx: &mpsc::Sender<Cmd>, paths: Vec<String>,) -> Result<QueuedPaths, String> { let paths = clean_store_paths(&paths); let event_paths = paths.clone(); if paths.is_empty() { return Ok(QueuedPaths { count: 0, event_paths, }); }
let (reply, queued) = oneshot::channel(); match cmd_tx.try_send(Cmd::Enqueue { paths, reply }) { Ok(()) => match queued.await { Ok(Ok(count)) => Ok(QueuedPaths { count, event_paths }), Ok(Err(error)) => Err(error), Err(_) => Err("cache upload worker stopped".to_owned()), }, Err(mpsc::error::TrySendError::Full(_)) => Err("cache upload queue is full".to_owned()), Err(mpsc::error::TrySendError::Closed(_)) => Err("cache upload worker stopped".to_owned()), }}
async fn send_built_paths_event(event_tx: &mpsc::Sender<Message>, paths: Vec<String>) { if paths.is_empty() { return; }
let msg = Message { id: "built-paths".to_owned(), built_paths: Some(v1::BuiltPaths { paths, reason: "post_build_hook".to_owned(), }), ..Default::default() }; let _ = event_tx.send(msg).await;}
async fn write_enqueue_response(conn: &mut VsockStream, queued: usize, error: Option<String>) { let response = EnqueueBuiltPathsResponse { queued, error: error.unwrap_or_default(), }; let _ = write_json_line(conn, &response).await;}
async fn write_json_line<T>(conn: &mut VsockStream, value: &T) -> Result<(), JsonLineError>where T: Serialize + ?Sized,{ let data = serde_json::to_vec(value).map_err(JsonLineError::Json)?; tokio::time::timeout(CACHE_ENQUEUE_IO_TIMEOUT, async { conn.write_all(&data).await?; conn.write_all(b"\n").await?; VsockStream::shutdown(conn, Shutdown::Write) }) .await .map_err(|_| JsonLineError::TimedOut)? .map_err(JsonLineError::Io)}
// we use a loopback vsock here since its better than having to do the whole http song and dance!pub async fn enqueue_built_paths(paths: &[String]) { let paths = clean_store_paths(paths); if paths.is_empty() { return; }
let token = match read_hook_token() { Ok(token) => token, Err(_) => return, };
if token.is_empty() { return; }
let mut conn = match VsockStream::connect(VsockAddr::new(VMADDR_CID_LOCAL, cache_enqueue_port())).await { Ok(conn) => conn, Err(error) => { warn!(paths = paths.len(), %error, "cache enqueue unavailable"); return; } };
let request = EnqueueBuiltPathsRequest { token, paths }; match write_json_line(&mut conn, &request).await { Ok(()) => {} Err(JsonLineError::Json(error)) => { warn!(%error, "cache enqueue encode failed"); return; } Err(JsonLineError::TimedOut) => { warn!("cache enqueue write timed out"); return; } Err(error) => { warn!(%error, "cache enqueue write failed"); return; } }
let response: EnqueueBuiltPathsResponse = match read_json_line(&mut conn).await { Ok(response) => response, Err(JsonLineError::Empty) => { warn!("cache enqueue ack was empty"); return; } Err(JsonLineError::TimedOut) => { warn!("cache enqueue ack timed out"); return; } Err(error) => { warn!(%error, "cache enqueue ack failed"); return; } };
if !response.error.is_empty() { warn!(error = %response.error, "cache enqueue rejected"); return; }
info!(queued = response.queued, "cache paths enqueued");}
fn cache_enqueue_port() -> u32 { std::env::var(SHUTTLE_CACHE_ENQUEUE_PORT_ENV) .ok() .and_then(|value| value.parse().ok()) .unwrap_or(DEFAULT_CACHE_ENQUEUE_PORT)}
fn create_hook_token() -> Result<String> { use std::io::Write;
fs::create_dir_all(SPINDLE_RUN_DIR).with_context(|| format!("create {SPINDLE_RUN_DIR}"))?; let token = random_token().context("generate hook token")?; let mut file = OpenOptions::new() .create(true) .truncate(true) .write(true) .mode(0o640) .open(SPINDLE_HOOK_TOKEN) .with_context(|| format!("create {SPINDLE_HOOK_TOKEN}"))?; allow_nix_build_group(SPINDLE_HOOK_TOKEN)?; file.write_all(token.as_bytes()) .with_context(|| format!("write {SPINDLE_HOOK_TOKEN}"))?; file.write_all(b"\n") .with_context(|| format!("write {SPINDLE_HOOK_TOKEN}"))?; Ok(token)}
fn allow_nix_build_group(path: &str) -> Result<()> { let Some(group) = Group::from_name(NIX_BUILD_GROUP).with_context(|| format!("lookup {NIX_BUILD_GROUP}"))? else { warn!( group = NIX_BUILD_GROUP, "nix build group not found; cache hook token remains root-only" ); return Ok(()); };
chown(path, None, Some(group.gid)).with_context(|| format!("chown {path} to {NIX_BUILD_GROUP}"))}
fn read_hook_token() -> Result<String> { fs::read_to_string(SPINDLE_HOOK_TOKEN) .map(|token| token.trim().to_owned()) .with_context(|| format!("read {SPINDLE_HOOK_TOKEN}"))}
fn random_token() -> Result<String> { let mut bytes = [0_u8; 32]; File::open("/dev/urandom") .context("open /dev/urandom")? .read_exact(&mut bytes) .context("read /dev/urandom")?;
let mut token = String::with_capacity(bytes.len() * 2); for byte in bytes { write!(&mut token, "{byte:02x}").unwrap(); } Ok(token)}