Module realtime 

Real-time protocol engine: WebSocket gateways + Server-Sent Events.

NestJS-Gateway ergonomics on a zero-cost, lock-free-on-the-hot-path Rust core. Declare a gateway, subscribe to events, broadcast to rooms — without ever naming an axum/tower type.

#[Injectable]
pub struct ChatGateway { db: Inject<Db> }

impl ArclyGateway for ChatGateway {
    async fn on_connect(&self, client: WsClient) { client.join_room("lobby"); }
}

#[Gateway("/chat-socket")]
impl ChatGateway {
    #[Subscribe("message::send")]
    async fn on_message(&self, client: WsClient, payload: Json<ChatMessage>)
        -> Result<(), Error>
    {
        client.broadcast_to_room(&payload.room, "message::receive", &*payload).await;
        Ok(())
    }
}

See macros for the exact expansion contract and the rationale for the #[Gateway]-on-impl placement.

Re-exports

pub use connection::ConnId;

pub use connection::ConnectionRegistry;

pub use connection::WsClient;

pub use connection::WsMessage;

pub use gateway::ArclyGateway;

pub use gateway::GatewayDescriptor;

pub use gateway::GatewayRuntime;

pub use gateway::LifecycleHook;

pub use gateway::MessageHandler;

pub use sse::SseEvent;

pub use sse::SseStream;

pub use ws::ws_route;

Modules

connection

Lock-free connection & broadcasting registry.

gateway

Gateway contracts: the ArclyGateway lifecycle trait and the link-time descriptor / runtime types the #[Gateway] macro emits.

macros

Registry glue for the real-time macro layer.

sse

High-performance Server-Sent Events engine.

ws

WebSocket boundary: upgrade, per-socket read/write pumps, event dispatch.

Attribute Macros

Gateway

Subscribe

#[Subscribe("event::name")] — marker consumed by the enclosing #[Gateway] walker. Pass-through so it also type-checks if a tool resolves it directly.