feat: proper README, LICENSE, and our first quick example

2026-08-06 00:29:27 +04:00 · 2026-08-06 00:29:27 +04:00 · d0287ccbec
commit d0287ccbec
parent 995f0f8c70
25 changed files with 1818 additions and 14 deletions
--- a/Cargo.toml
+++ b/Cargo.toml
@ -41,6 +41,7 @@ tokio = { version = "1", features = ["rt", "rt-multi-thread", "macros", "process
 name = "swactor"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 autobenches = false
 [profile.bench]
--- a/661
+++ b/661
@ -0,0 +1,661 @@
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  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU AGPL, see
 <https://www.gnu.org/licenses/>.
--- a/README.md
+++ b/README.md
@ -1,23 +1,392 @@
 # swactor
-Minimal actor runtime for Rust. One trait, one message type.
+A small, WASM-first actor runtime for Rust: one trait, location-transparent
-Single-threaded (`tick()`) or multi-threaded (`run()`).
+addresses, and a built-in cluster. Actors are ordinary structs; a message is
 any `Clone + Send + Sync` type; an address works the same whether the actor
 lives in this process, on a peer, or behind NAT on another node.
-## Description
+## What it is
-Core runtime is `src/`. Actors implement `ActorInterface` (in `actor.rs`),
+Every actor is one trait. There is no separate message trait to implement —
-interact through `Ctx` (in `runtime.rs`), and run on worker threads (`worker.rs`).
+anything `Clone + Send + Sync` is a message by blanket impl:
-`crates/` builds upward: `std` adds OTP patterns (supervision, monitoring, groups),
+```rust
-`distribution` adds clustering, everything else composes from there.
+// src/actor.rs
-
+pub trait Message: 'static + Sized + Clone + Send + Sync {}
-## Dev commands
+impl<T: 'static + Sized + Clone + Send + Sync> Message for T {}
 `cargo xtask --help` for the basic test command.
 ## Testing
 pub trait ActorInterface: 'static + Send {
    type Incoming: Message;
    type Response: Message;
    fn handle(&mut self, ctx: &Ctx, msg: Self::Incoming);
    // ...on_start, on_stop, handle_down (death monitoring) as needed
 }
 ```
 You drive the runtime single-threaded with `tick()` (this is what compiles to
 WASM) or multi-threaded with `run()`:
 ```rust
 use swactor::actor::{ActorInterface, Ctx};
 use swactor::runtime::{Runtime, RuntimeConfig};
 struct Counter { count: u64 }
 impl ActorInterface for Counter {
    type Incoming = ();            // `()` is Clone + Send + Sync, so it's a message
    type Response = ();
    fn handle(&mut self, _ctx: &Ctx, _: Self::Incoming) {
        self.count += 1;
        println!("hit #{self.count}");
    }
 }
 fn main() -> Result<(), swactor::Error> {
    let rt = Runtime::new(RuntimeConfig::default()); // 1 worker → drive with tick()
    let addr = rt.spawn(Counter { count: 0 })?;
    rt.send_to(addr, ())?;
    for _ in 0..3 { rt.tick(); }                      // spawn → handle → done
    Ok(())
 }
 ```
 `RuntimeConfig` is four knobs — `max_actors`, `channel_buffer_size`,
 `num_threads`, and a per-tick `actor_message_budget` (inspired by BEAM's
 reduction count, so one chatty mailbox can't starve the rest).
 ## Features
 Each feature is shown in the code that implements it.
 ### Route messages by actor_id across cluster boundaries
 An actor's identity is a 32-byte address, not a pointer:
 ```rust
 // src/actor.rs
 pub struct ActorAddress(pub [u8; 32]);
 ```
 You send to it the same way whether it lives in this process, on a peer across
 the room, or behind NAT on another continent — one call, `ctx.send(addr, msg)`.
 The locality decision is exactly one address-map lookup; a miss hands the
 message to the cluster transport instead of a local worker:
 ```rust
 // src/delivery.rs — the cluster boundary
 fn route_nonlocal(&self, addr: ActorAddress, msg: Box<dyn Any + Send>) -> Result<(), Error> {
    #[cfg(feature = "transport")]
    {
        if self.inbox_registry.contains(&addr) {        // a pending reply inbox
            return self.inbox_registry.try_deliver(addr, msg);
        }
        if let Some(sink) = self.remote_sink {          // ← off this node
            return sink.send(addr, msg);
        }
    }
    self.inbox_registry.try_deliver(addr, msg)
 }
 ```
 The transport seam is a single trait — any cluster driver satisfies it:
 ```rust
 // src/runtime.rs
 pub trait RemoteSink: Send + Sync {
    fn send(&self, addr: ActorAddress, msg: Box<dyn Any + Send>) -> Result<(), Error>;
 }
 ```
 Where `addr` lives is resolved from a signed, gossiped directory: a host-signed
 `DirectoryEntry` binds `actor_addr → node_id`, backed by an LRU `LocationCache`.
 The node's own mailbox (`node_id → ActorAddress`) is rebound on restart without
 changing identity, which is why `NodeId` and `ActorAddress` are deliberately
 distinct types.
 ### WASM by default
 The same runtime that runs on a thread pool also compiles to `wasm32` and steps
 one tick at a time from a host (browser, Node, an embedding app). Randomness,
 timers, and the address map all have a no-op/wasm path behind the `wasm`
 feature. The [ping-pong demo](examples/ping-pong) is one runtime compiled to a
 `.wasm` cdylib and driven by Node:
 ```sh
 cd examples/ping-pong && ./run.sh
 ```
 ### Built-in engine and driver, tasks included
 A node ships batteries-included: the actor engine (worker threads), a network
 driver, and the pump/fanout tasks that wire them — you don't assemble the glue.
 The driver tracks its own established send/recv pumps per QUIC stream and emits
 lifecycle events (edge ready, stream fault, pump stopped):
 ```rust
 // crates/iroh-driver/src/driver_pumps.rs
 pub enum DriverEventOut {
    DriverEdgeReady { edge_id: EdgeId },
    StreamFault { edge_id: EdgeId },
    PumpStopped { edge_id: EdgeId, ring_id: RingId },
 }
 ```
 ### `iroh` integration — QUIC, TLS, and NAT traversal
 The bundled driver is [iroh](https://iroh.computer): QUIC-based peer transport
 with built-in TLS, NAT hole-punching, and relay-server fallback. You hand it a
 Tokio engine and it runs accepts, dials, stream I/O, retries, and shutdown on
 it; peers are admitted through an optional allow-list:
 ```rust
 // crates/iroh-driver/src/iroh_driver.rs
 pub struct IrohDriverConfig {
    pub secret_key: Option<SecretKey>,   // None → fresh random identity
    pub relay_mode: RelayMode,           // default: n0 production relays
    pub node: DistributedNodeConfig,
    pub peer_auth: Option<Arc<Mutex<PeerAllowList>>>,
    pub additional_alpns: Vec<Vec<u8>>,  // opaque to the driver
 }
 ```
 ### Built-in SWIM cluster
 Membership is a real SWIM implementation — direct + indirect (relay) probes,
 suspicion timers, and Lifeguard local-health scaling — not heartbeats. The probe
 state machine emits typed actions; the host adapter turns them into sends:
 ```rust
 // crates/distribution/src/swim/probe.rs
 pub enum SwimAction {
    SendPing { to: NodeId, sequence: u64 },
    SendPingReq { relay: NodeId, target: NodeId, sequence: u64 }, // indirect probe
    Suspect(NodeId),
    DeclareDead(NodeId),
    Diag(SwimDiagEvent), // RTT samples — observation only, no protocol effect
 }
 ```
 Name bindings, node metadata (relay URL, human name), and the actor→host
 directory each run as independent gossip actors, so the cluster goes quiet once
 it converges.
 ### OTP-style standard library
 Behind the `std` feature, one extension adds the patterns you reach for:
 symbolic naming, death monitoring (watching), and process groups. Install it on
 the runtime and actors get `CtxWatching` / `CtxNaming`:
 ```rust
 // src/std/extension.rs
 pub struct StdExtension {
    name_registry: NameRegistry,    // logical names → addresses
    watch_registry: WatchRegistry,  // exit notifications
    group_registry: GroupRegistry,  // named groups / pub-sub
 }
 // runtime.with_extension(Arc::new(StdExtension::new()));
 ```
 ### Process manager for external processes
 Treat an OS process like an actor. Describe it, spawn it onto the runtime, and
 send it commands; its lifecycle (started / exited / signaled) arrives as
 messages:
 ```rust
 // crates/process/src/types.rs
 pub struct ProcessSpec {
    pub command: String,
    pub args: Vec<String>,
    pub env: HashMap<String, String>,
    pub working_dir: Option<std::path::PathBuf>,
    pub label: Option<String>,
 }
 ```
 There's a YAML-driven pipeline layer on top (`crates/process/src/pipeline.rs`)
 for multi-step jobs with progress and failure reporting.
 ### Zero-copy movement of large byte objects
 The data-plane ships large, *typed* byte objects between actors — and across
 nodes — without copying. The motivating workload is sharded inference: one GPU's
 output activation is the next GPU's input, so it rides a bounded ring leased from
 a shared arena. A ring is either local (IPC between two actors on one node) or
 the two ends of a QUIC edge:
 ```text
 producer → egress ring ──QUIC──▶ ingress ring → consumer
           (arena lease; zero-copy at both ends)
 ```
 What travels on a wire edge is typed, so the receiver knows what arrived:
 ```rust
 // crates/data-plane/src/actor.rs
 pub enum EdgeKind {
    TokenIn,
    Activation,   // a hidden-state tensor forwarded to the next shard
    TokenOut,
 }
 // crates/data-plane/src/edge_lifecycle.rs
 pub struct ObjectSpec {
    pub kind: ObjectKind,        // Activation
    pub dtype: DType,            // F16
    pub max_extent_bytes: u64,
 }
 ```
 The edge actor owns the lifecycle: lease a byte range, install an ingress or
 egress ring, and release it only with a `QuiescenceProof`, so a range is never
 recycled under a live reader. The worker consumes whole objects off its ingress
 ring as plain bytes:
 ```rust
 // apps/myelin/src/node/worker_node_runtime.rs
 match ingress::read_object_record(buffer, object_spec, false)? {
    ingress::ObjectRecordRead::Incomplete => Ok(None),      // wait for more bytes
    ingress::ObjectRecordRead::Complete(record) => {        // a full activation arrived
        let bytes: Vec<u8> = buffer.drain(..record.total_len).collect();
        Ok(Some(IngressRecordBytes { bytes, object_id: record.object_id.0, .. }))
    }
 }
 ```
 ### Custom metrics through the datastream
 Telemetry is a deliberately dumb pipe: producers tag bytes with a channel id,
 nothing in the middle interprets the payload, and views are read-time
 projections. To add a metric stream, define a type and implement one constant —
 no schema registry to negotiate with:
 ```rust
 // crates/datastream/src/record.rs
 pub trait Record {
    const CHANNEL: &'static str;
 }
 // crates/data-plane/src/arena.rs — the arena publishes its own health this way
 impl Record for ArenaSample {
    const CHANNEL: &'static str = ARENA_SAMPLE_CHANNEL; // "mvp.arena"
 }
 ```
 ### Built-in dashboard
 A read-only HTML/SSE dashboard renders the frames the datastream already
 carries — workers, the actor roster, per-actor dossiers, fleet hardware. It sends
 no control signals back, so the whole thing is one Axum router:
 ```rust
 // crates/dashboard/src/server.rs
 fn router(state: AppState) -> Router {
    Router::new()
        .route("/", get(root_page))
        .route("/events", get(frame_stream))                 // live frames over SSE
        .route("/api/frames", get(recent_frames))
        .route("/api/views", get(views_json))
        .route("/api/view/{*path}", get(view_snapshot))
        .route("/view/{*path}", get(view_page))
        .with_state(state)
 }
 ```
 ## Architecture
 The workspace builds upward from a tiny core. Each crate is one responsibility:
 ```mermaid
 flowchart TD
    app["myelin<br/>node · orchestrator"]
    driver["iroh-driver<br/>QUIC network driver"]
    dist["distribution<br/>SWIM · registry · directory"]
    dash["dashboard<br/>read-only view over datastream"]
    proc["process<br/>managed external processes"]
    dp["data-plane<br/>zero-copy byte movement · IPC · links"]
    ds["datastream<br/>metrics / telemetry pipe"]
    trans["transport<br/>codec · identity · crypto"]
    core["swactor<br/>core runtime + std (OTP)<br/>ActorInterface · Ctx"]
    app --> driver
    app --> dist
    app --> dp
    app --> dash
    app --> proc
    driver --> dist
    driver --> ds
    dist --> trans
    dist --> ds
    dash --> ds
    proc --> ds
    ds --> trans
    trans --> core
    dp --> core
    ds --> core
    proc --> core
 ```
 | Crate | Role |
 | --- | --- |
 | `swactor` (`src/`) | Core runtime: the actor trait, `Ctx`, scheduler, address map, channels |
 | `crates/transport` | Codec registry, node identity, message signing — transport-agnostic |
 | `crates/distribution` | Clustering: SWIM membership, naming, metadata + actor directory gossip |
 | `crates/iroh-driver` | iroh/QUIC network driver with its pump/fanout tasks |
 | `crates/datastream` | Metrics / telemetry pipe — nothing in the middle interprets payloads |
 | `crates/data-plane` | Zero-copy movement of large typed byte objects over IPC or a network link |
 | `crates/process` | Managed external processes and YAML pipelines |
 | `crates/dashboard` | Read-only HTML/SSE dashboard over datastream frames |
 | `crates/provisioning` | Cloud node provisioning |
 | `crates/bindings/{python,wasm-runtime,wasm-crypto}` | Language / target bindings |
 | `apps/myelin` | The node binary that wires the above into a runnable cluster node |
 | `tools/vastai` | Vast.ai GPU-marketplace tooling |
 ## Used for
 - **A drop-in replacement for GPU jobs on cloud infrastructure.** `apps/myelin`
  ships an orchestrator plus a containerized worker node
  (`apps/myelin/node-image`) that provisions, stages models, and runs them.
 - **Orchestration for sharded inference.** The node image includes a
  [tinygrad](https://github.com/tinygrad/tinygrad) worker
  (`apps/myelin/node-image/tinygrad_worker.py`); a vLLM backend is planned.
 ## Examples
 **Working:** [`examples/ping-pong`](examples/ping-pong) — two actors volley on a
 single-threaded runtime compiled to WebAssembly, driven tick-by-tick from Node.
 Shows spawning, message passing, and death monitoring in one file.
 **Planned** (tracked in `.deployment-notes/ROADMAP.md`):
 - Two actors talking in-process, over IPC, and across a WAN — in Rust, Python,
  and WASM — from the same code.
 - Typed chunk streaming across IPC or WAN.
 - A non-trivially sharded training job (not easily expressed in Ray).
 - A full pipeline-parallel example of a model sharded across N ≥ 3 cheap GPUs.
 ## Developing
 Requires the pinned nightly toolchain (`rust-toolchain.toml`):
 ```sh
 cargo check --workspace
-cargo xtask test
+cargo xtask test          # see `cargo xtask --help`
 ```
 The language bindings (`crates/bindings/*`) build on demand with `-p` /
 `--workspace`, not during normal native iteration.
 ## Status
 swactor is early and under active development. The runtime, clustering, and the
 `myelin` node are exercised by the workspace test suite, but APIs are still
 moving.
 ## License
 Licensed under the [GNU Affero General Public License v3.0 only]
 (./LICENSE) (`AGPL-3.0-only`). The AGPL's network clause (§13) requires anyone
 who runs a modified swactor as a network service to offer its source to users.
 The copyright holder is not bound by their own license and may relicense future
 releases freely; external contributors should expect a CLA requirement before
 changes are merged.
--- a/apps/myelin/Cargo.toml
+++ b/apps/myelin/Cargo.toml
@ -2,6 +2,7 @@
 name = "myelin"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 publish = false
 autobins = false
--- a/crates/bindings/python/Cargo.toml
+++ b/crates/bindings/python/Cargo.toml
@ -2,6 +2,7 @@
 name = "python"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 [lib]
 name = "swactor"
--- a/crates/bindings/wasm-crypto/Cargo.toml
+++ b/crates/bindings/wasm-crypto/Cargo.toml
@ -2,6 +2,7 @@
 name = "wasm-crypto"
 version = "0.1.0"
 edition = "2021"
 license = "AGPL-3.0-only"
 [lib]
 crate-type = ["cdylib"]
--- a/crates/bindings/wasm-runtime/Cargo.toml
+++ b/crates/bindings/wasm-runtime/Cargo.toml
@ -2,6 +2,7 @@
 name = "wasm-runtime"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 [lib]
 crate-type = ["cdylib"]
--- a/crates/dashboard/Cargo.toml
+++ b/crates/dashboard/Cargo.toml
@ -2,6 +2,7 @@
 name = "dashboard"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 [dependencies]
 axum = "0.8"
--- a/crates/data-plane/Cargo.toml
+++ b/crates/data-plane/Cargo.toml
@ -2,6 +2,7 @@
 name = "data-plane"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 publish = false
 [dependencies]
--- a/crates/datastream/Cargo.toml
+++ b/crates/datastream/Cargo.toml
@ -2,6 +2,7 @@
 name = "datastream"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 [dependencies]
 swactor = { path = "../..", features = ["serde", "transport"] }
--- a/crates/distribution/Cargo.toml
+++ b/crates/distribution/Cargo.toml
@ -2,6 +2,7 @@
 name = "distribution"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 [features]
 default = []
--- a/crates/iroh-driver/Cargo.toml
+++ b/crates/iroh-driver/Cargo.toml
@ -2,6 +2,7 @@
 name = "iroh-driver"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 [lib]
 name = "iroh_driver"
--- a/crates/process/Cargo.toml
+++ b/crates/process/Cargo.toml
@ -2,6 +2,7 @@
 name = "swactor-process"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 [dependencies]
 swactor = { path = "../..", default-features = false, features = ["no_random"] }
--- a/crates/provisioning/Cargo.toml
+++ b/crates/provisioning/Cargo.toml
@ -2,6 +2,7 @@
 name = "provisioning"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 publish = false
 [dependencies]
--- a/crates/transport/Cargo.toml
+++ b/crates/transport/Cargo.toml
@ -2,6 +2,7 @@
 name = "swactor-transport"
 version = "0.1.0"
 edition = "2021"
 license = "AGPL-3.0-only"
 [lib]
 name = "swactor_transport"
--- a/examples/ping-pong/.gitignore
+++ b/examples/ping-pong/.gitignore
@ -0,0 +1,3 @@
 # wasm-pack build output (regenerated by ./run.sh and ./serve.sh)
 /pkg
 /pkg-web
--- a/examples/ping-pong/Cargo.lock
+++ b/examples/ping-pong/Cargo.lock
@ -0,0 +1,268 @@
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 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 [[package]]
 name = "slab"
 version = "0.4.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c790de23124f9ab44544d7ac05d60440adc586479ce501c1d6d7da3cd8c9cf5"
 [[package]]
 name = "smallvec"
 version = "1.15.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ed6a63f02c8539c91a8685a86f4099661ba3da017932f6ebbea6de3f0fa7c90"
 [[package]]
 name = "swactor"
 version = "0.1.0"
 dependencies = [
 "crossbeam-queue",
 "crossbeam-utils",
 "parking_lot",
 "web-time",
 ]
 [[package]]
 name = "syn"
 version = "2.0.119"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "872831b642d1a07999a962a351ed35b955ea2cfc8f3862091e2a240a84f17297"
 dependencies = [
 "proc-macro2",
 "quote",
 "unicode-ident",
 ]
 [[package]]
 name = "unicode-ident"
 version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4b067c0c11094aef6b7a801c1e34a26affafdf3d051dba08456b868789aaf9a4"
 dependencies = [
 "cfg-if",
 "once_cell",
 "rustversion",
 "wasm-bindgen-macro",
 "wasm-bindgen-shared",
 ]
 [[package]]
 name = "wasm-bindgen-macro"
 version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "167ce5e579f6bcf889c4f7175a8a5a585de84e8ff93976ce393efa5f2837aab1"
 dependencies = [
 "quote",
 "wasm-bindgen-macro-support",
 ]
 [[package]]
 name = "wasm-bindgen-macro-support"
 version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f3997c7839262f4ef12cf90b818d6340c18e80f263f1a94bf157d0ec4420380e"
 dependencies = [
 "bumpalo",
 "proc-macro2",
 "quote",
 "syn",
 "wasm-bindgen-shared",
 ]
 [[package]]
 name = "wasm-bindgen-shared"
 version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc1b4cb0cc549fcf58d7dfc081778139b3d283a081644e833e84682ad71cea24"
 dependencies = [
 "unicode-ident",
 ]
 [[package]]
 name = "web-time"
 version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa30049b1c872b72c89866d458eae9f20380ab280ffd1b1e18df2d3e2d98cfe0"
 dependencies = [
 "js-sys",
 "wasm-bindgen",
 ]
 [[package]]
 name = "windows-link"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
--- a/examples/ping-pong/Cargo.toml
+++ b/examples/ping-pong/Cargo.toml
@ -0,0 +1,18 @@
 [package]
 name = "pingpong"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 publish = false
 description = "swactor ping-pong: a minimal WebAssembly actor demo"
 [lib]
 crate-type = ["cdylib"]
 # Declares this example as its own workspace root so it builds standalone
 # (with `./run.sh`) without joining the root workspace.
 [workspace]
 [dependencies]
 swactor = { path = "../..", default-features = false, features = ["wasm", "std"] }
 wasm-bindgen = "0.2"
--- a/examples/ping-pong/index.html
+++ b/examples/ping-pong/index.html
@ -0,0 +1,159 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>swactor · ping-pong</title>
 <style>
  :root {
    --bg: #0d1117; --surface: #161b22; --border: #30363d;
    --text: #c9d1d9; --dim: #8b949e; --accent: #58a6ff;
    --green: #3fb950; --yellow: #d29922; --purple: #bc8cff;
    --font: 'SF Mono', 'Cascadia Code', 'Fira Code', ui-monospace, monospace;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0; padding: 32px 20px;
    font-family: var(--font); background: var(--bg); color: var(--text);
    line-height: 1.5;
  }
  h1 { font-size: 1.5em; margin: 0 0 2px; }
  h1 span { color: var(--accent); }
  .subtitle { color: var(--dim); font-size: 0.85em; margin-bottom: 24px; }
  .card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 8px; padding: 20px; max-width: 640px; margin: 0 auto;
  }
  .controls { display: flex; gap: 8px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
  label { color: var(--dim); font-size: 0.8em; }
  input {
    background: var(--bg); border: 1px solid var(--border); color: var(--text);
    padding: 6px 10px; border-radius: 4px; font-family: var(--font);
    font-size: 0.85em; width: 72px;
  }
  input:focus { outline: none; border-color: var(--accent); }
  .btn {
    padding: 6px 16px; border: 1px solid var(--border); background: var(--surface);
    color: var(--text); border-radius: 4px; cursor: pointer; font-family: var(--font);
    font-size: 0.85em; transition: 0.15s;
  }
  .btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
  .btn:active:not(:disabled) { transform: scale(0.97); }
  .btn:disabled { opacity: 0.45; cursor: default; }
  #status { color: var(--dim); font-size: 0.8em; margin-left: auto; }
  #status .v { color: var(--green); font-weight: bold; }
  #log {
    background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
    padding: 12px; font-size: 0.85em; line-height: 1.7; height: 360px;
    overflow-y: auto; white-space: pre;
  }
  .log-line { animation: fadeIn 0.2s ease; }
  .log-line.ping .side { color: var(--accent); }
  .log-line.pong .side { color: var(--purple); }
  .log-line.done .side, .log-line.done { color: var(--yellow); }
  .log-line.stop { color: var(--dim); }
  @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
  #loading { text-align: center; color: var(--dim); padding: 48px; }
  .err { color: #f85149; }
  .dash { color: var(--accent); text-decoration: none; border-bottom: 1px dotted var(--accent); }
  .dash:hover { color: var(--green); border-color: var(--green); }
 </style>
 </head>
 <body>
 <h1><span>swactor</span> · ping-pong</h1>
 <p class="subtitle">
  Two actors volley a ball on a WebAssembly actor runtime. The browser drives it
  one <code>tick()</code> at a time; each line below is one actor message.<br>
  <a class="dash" href="http://localhost:9090/" target="_blank" rel="noopener">swactor dashboard &nearr;</a>
  &mdash; live actor stats, served alongside this page.
 </p>
 <div class="card">
  <div class="controls">
    <label for="volleys">volleys</label>
    <input id="volleys" type="number" min="2" max="999" value="10">
    <button id="serve" class="btn">Serve</button>
    <span id="status"></span>
  </div>
  <div id="log"></div>
 </div>
 <div id="loading">Loading wasm…</div>
 <script type="module">
  import init, { App } from "./pkg-web/pingpong.js";
  let app;
  try {
    await init();
    app = new App();
  } catch (e) {
    document.getElementById("loading").innerHTML =
      '<span class="err">Failed to load wasm.</span><br><br>' +
      'Serve this directory over HTTP (run <code>./serve.sh</code>), ' +
      'don\'t open the file directly.';
    throw e;
  }
  document.getElementById("loading").style.display = "none";
  const logEl = document.getElementById("log");
  const serveBtn = document.getElementById("serve");
  const volleysInput = document.getElementById("volleys");
  const statusEl = document.getElementById("status");
  const TICK_MS = 240;
  function classify(line) {
    if (line.startsWith("ping")) return "ping";
    if (line.startsWith("pong")) return "pong";
    if (line.startsWith("done")) return "done";
    return "stop";
  }
  function appendLine(line) {
    const cls = classify(line);
    const div = document.createElement("div");
    div.className = "log-line " + cls;
    // Highlight the side token (ping/pong/done) for readability.
    const side = line.slice(0, 4).trimEnd();
    div.innerHTML = '<span class="side">' + side + "</span>" + line.slice(4);
    logEl.appendChild(div);
    logEl.scrollTop = logEl.scrollHeight;
  }
  function setStatus(actors, msgs) {
    statusEl.innerHTML = "actors <span class=\"v\">" + actors + "</span> · messages <span class=\"v\">" + msgs + "</span>";
  }
  function serve() {
    // Reset for a fresh rally.
    logEl.innerHTML = "";
    app = new App();
    const max = Math.max(2, Number(volleysInput.value) || 10);
    const log = app.new_log();
    const pong = app.spawn_pong(log.addr(), max);
    app.spawn_ping(pong, log.addr(), max);
    serveBtn.disabled = true;
    setStatus(app.actor_count(), 0);
    const iv = setInterval(() => {
      app.tick();
      let line;
      while ((line = log.try_recv())) appendLine(line);
      setStatus(app.actor_count(), app.total_messages());
      if (app.actor_count() === 0) {
        clearInterval(iv);
        serveBtn.disabled = false;
      }
    }, TICK_MS);
  }
  serveBtn.addEventListener("click", serve);
  // Auto-play the first rally on load.
  serve();
 </script>
 </body>
 </html>
--- a/examples/ping-pong/run.mjs
+++ b/examples/ping-pong/run.mjs
@ -0,0 +1,28 @@
 // swactor ping-pong -- host driver.
 //
 // Spawns a Ping and a Pong actor on the wasm actor runtime, then drives it
 // tick-by-tick, printing each volley as it happens. Pass an optional volley cap:
 //
 //     node run.mjs [volleys]      (default 10)
 import { App } from "./pkg/pingpong.js";
 const max = Math.max(2, Number(process.argv[2] ?? 10));
 const app = new App();
 const log = app.new_log();
 const pong = app.spawn_pong(log.addr(), max);
 app.spawn_ping(pong, log.addr(), max);
 console.log(`\n== swactor ping-pong ==  target ${max} volleys\n`);
 for (let t = 0; t < 1000; t++) {
  app.tick();
  let line;
  while ((line = log.try_recv())) console.log("  " + line);
  if (app.actor_count() === 0) break;
 }
 console.log(
  `\nactors remaining: ${app.actor_count()}, messages processed: ${app.total_messages()}\n`,
 );
--- a/examples/ping-pong/run.sh
+++ b/examples/ping-pong/run.sh
@ -0,0 +1,11 @@
 #!/usr/bin/env bash
 # swactor ping-pong -- compile the demo to WebAssembly and run it.
 #
 # One-liner from this directory:   ./run.sh [volleys]
 #
 # Compiles the Rust cdylib to ./pkg/ via wasm-pack, then drives it with Node.
 set -euo pipefail
 cd "$(dirname "$0")"
 wasm-pack build --target nodejs --out-name pingpong
 node run.mjs "$@"
--- a/examples/ping-pong/serve.sh
+++ b/examples/ping-pong/serve.sh
@ -0,0 +1,40 @@
 #!/usr/bin/env bash
 # swactor live demo -- serve the ping-pong wasm page AND the swactor dashboard.
 #
 # One-liner from this directory:   ./serve.sh [port]
 #
 # Brings up two local servers:
 #   - swactor dashboard (native Rust; a dummy node feeds it live actor stats)
 #       at http://localhost:9090/
 #   - ping-pong wasm demo (static files)
 #       at http://localhost:<port>/   (default 8000)
 #
 # Ctrl+C stops both.
 set -euo pipefail
 cd "$(dirname "$0")"
 ROOT="$(cd ../.. && pwd)"
 port="${1:-8000}"
 dash_port=9090
 # --- swactor dashboard -------------------------------------------------------
 # The dashboard is a workspace member; build it from the root manifest, then run
 # the dummy-node binary, which starts the Axum server and publishes live stats.
 echo ">> building swactor dashboard..."
 cargo build --manifest-path "$ROOT/Cargo.toml" -p dashboard --bin swactor_dummy_node
 echo ">> launching dashboard on :${dash_port}"
 "$ROOT/target/debug/swactor_dummy_node" &
 dash_pid=$!
 cleanup() { kill "$dash_pid" 2>/dev/null || true; wait "$dash_pid" 2>/dev/null || true; }
 trap cleanup EXIT INT TERM
 # --- ping-pong wasm page -----------------------------------------------------
 wasm-pack build --target web --out-name pingpong --out-dir pkg-web
 echo
 echo ">>  ping-pong  : http://localhost:${port}/"
 echo ">>  dashboard  : http://localhost:${dash_port}/   (live swactor stats)"
 echo ">>  (Ctrl+C to stop)"
 echo
 python3 -m http.server "$port"
--- a/examples/ping-pong/src/lib.rs
+++ b/examples/ping-pong/src/lib.rs
@ -0,0 +1,232 @@
 //! swactor · ping-pong -- a minimal WebAssembly actor demo.
 //!
 //! Two actors, `Ping` and `Pong`, volley a ball back and forth on a
 //! single-threaded actor runtime compiled to wasm. The host (Node.js) advances
 //! the runtime one step at a time with `tick()` and drains a shared log inbox
 //! to print each volley.
 //!
 //! When the volley cap is reached the hitter stops; the other actor, which is
 //! *watching* it, observes the death, posts a final summary, and stops too.
 //! This shows the three load-bearing swactor ideas in one place: spawning
 //! actors, message passing, and death monitoring.
 //!
 //! Build & run from this directory:  `./run.sh`
 use std::sync::Arc;
 use wasm_bindgen::prelude::*;
 use swactor::actor::{ActorAddress, ActorExited, ActorInterface};
 use swactor::runtime::{Ctx, Inbox, Runtime as SwactorRuntime, RuntimeConfig};
 use swactor::std::{CtxWatching, StdExtension};
 // ─── Host-facing bindings ───────────────────────────────────────────────────
 /// Opaque actor-address handle, passed between spawn calls and the host.
 #[wasm_bindgen]
 #[derive(Clone)]
 pub struct Addr(ActorAddress);
 /// Inbox the host polls each tick for log lines and the final summary.
 #[wasm_bindgen]
 pub struct LogInbox {
    inner: Inbox<String>,
 }
 #[wasm_bindgen]
 impl LogInbox {
    /// The address actors send their log lines to.
    pub fn addr(&self) -> Addr {
        Addr(*self.inner.addr())
    }
    /// Pop the next log line, or `undefined` when empty.
    pub fn try_recv(&self) -> Option<String> {
        self.inner.try_recv()
    }
 }
 /// The ping-pong app: a single-threaded swactor runtime with the std extension
 /// (watching) installed. The host drives it by calling [`App::tick`].
 #[wasm_bindgen]
 pub struct App {
    rt: SwactorRuntime,
 }
 #[wasm_bindgen]
 impl App {
    #[wasm_bindgen(constructor)]
    pub fn new() -> App {
        let rt = SwactorRuntime::new(RuntimeConfig {
            num_threads: 1,
            ..RuntimeConfig::default()
        })
        .with_extension(Arc::new(StdExtension::new()));
        App { rt }
    }
    /// Advance the runtime one tick.
    pub fn tick(&self) {
        self.rt.tick();
    }
    /// Actors currently alive.
    pub fn actor_count(&self) -> usize {
        self.rt.stats().actors.len()
    }
    /// Total messages processed across all workers.
    pub fn total_messages(&self) -> f64 {
        self.rt
            .stats()
            .workers
            .iter()
            .map(|w| w.messages_processed)
            .sum::<u64>() as f64
    }
    /// Create a log inbox the host drains each tick.
    pub fn new_log(&self) -> LogInbox {
        LogInbox {
            inner: self.rt.new_inbox().expect("new_log"),
        }
    }
    /// Spawn the `Pong` actor. Returns its address.
    pub fn spawn_pong(&self, log: &Addr, max_volleys: u32) -> Addr {
        let addr = self
            .rt
            .spawn(Pong {
                log: log.0,
                max: max_volleys,
            })
            .expect("spawn pong");
        Addr(addr)
    }
    /// Spawn the `Ping` actor, pointed at an existing `Pong`. Returns its address.
    pub fn spawn_ping(&self, pong: &Addr, log: &Addr, max_volleys: u32) -> Addr {
        let addr = self
            .rt
            .spawn(Ping {
                pong: pong.0,
                log: log.0,
                max: max_volleys,
            })
            .expect("spawn ping");
        Addr(addr)
    }
 }
 // ─── The ball ───────────────────────────────────────────────────────────────
 /// A ball in flight between the two actors.
 ///
 /// `volleys` is the running hit count -- each hitter increments it. `from` is
 /// the address the ball came from (and should be returned to). `Ping` knows
 /// `Pong` from spawn time so only `Pong` reads `from`, but both set it so the
 /// protocol reads symmetrically.
 #[derive(Clone)]
 struct Ball {
    volleys: u32,
    from: ActorAddress,
 }
 // ─── Ping ───────────────────────────────────────────────────────────────────
 struct Ping {
    pong: ActorAddress,
    log: ActorAddress,
    max: u32,
 }
 impl Ping {
    /// Hit the ball as volley number `v`: log it, then either return it to Pong
    /// or, if the cap is reached, stop.
    fn volley(&self, ctx: &Ctx, v: u32) {
        let _ = ctx.send(self.log, format!("ping  | volley {:>2}/{}", v, self.max));
        if v < self.max {
            let _ = ctx.send(
                self.pong,
                Ball {
                    volleys: v,
                    from: ctx.self_addr(),
                },
            );
        } else {
            let _ = ctx.send(self.log, "ping  | cap reached, stopping".to_string());
            ctx.stop_self();
        }
    }
 }
 impl ActorInterface for Ping {
    type Incoming = Ball;
    type Response = ();
    fn on_start(&mut self, ctx: &Ctx) {
        // Ping knows Pong from spawn time, so it can watch it immediately.
        ctx.watch(self.pong);
        self.volley(ctx, 1); // serve
    }
    fn handle(&mut self, ctx: &Ctx, ball: Ball) {
        // Pong returned the ball; this is our next hit.
        self.volley(ctx, ball.volleys + 1);
    }
    fn on_actor_exit(&mut self, ctx: &Ctx, exited: ActorExited) {
        let _ = ctx.send(
            self.log,
            format!(
                "done  | rally complete -- {} volleys played (pong exited: {:?})",
                self.max, exited.reason
            ),
        );
        ctx.stop_self();
    }
 }
 // ─── Pong ───────────────────────────────────────────────────────────────────
 struct Pong {
    log: ActorAddress,
    max: u32,
 }
 impl ActorInterface for Pong {
    type Incoming = Ball;
    type Response = ();
    fn handle(&mut self, ctx: &Ctx, ball: Ball) {
        // Watch whoever served this ball. Idempotent across volleys, so this is
        // also how Pong (spawned before Ping) first learns Ping's address.
        ctx.watch(ball.from);
        let v = ball.volleys + 1;
        let _ = ctx.send(self.log, format!("pong  | volley {:>2}/{}", v, self.max));
        if v < self.max {
            let _ = ctx.send(
                ball.from,
                Ball {
                    volleys: v,
                    from: ctx.self_addr(),
                },
            );
        } else {
            let _ = ctx.send(self.log, "pong  | cap reached, stopping".to_string());
            ctx.stop_self();
        }
    }
    fn on_actor_exit(&mut self, ctx: &Ctx, exited: ActorExited) {
        let _ = ctx.send(
            self.log,
            format!(
                "done  | rally complete -- {} volleys played (ping exited: {:?})",
                self.max, exited.reason
            ),
        );
        ctx.stop_self();
    }
 }
--- a/tools/vastai/Cargo.toml
+++ b/tools/vastai/Cargo.toml
@ -2,6 +2,7 @@
 name = "swactor-vastai"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 publish = false
 [dependencies]
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@ -2,6 +2,7 @@
 name = "xtask"
 version = "0.1.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 [dependencies]
 serde_json = "1"