Add AgentOS daemon control plane and maintenance tooling
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# Rust Quickstart (Beta)
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> Source: `src/content/docs/actors/quickstart/rust.mdx`
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> Canonical URL: https://rivet.dev/docs/actors/quickstart/rust
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> Description: Build a Rivet Actor in Rust
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---
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Rust support is in beta. The supported public Rust API is `rivetkit` and `rivetkit-client`; lower-level crates are internal implementation details and do not carry a stability guarantee. See the full API reference on [docs.rs/rivetkit](https://docs.rs/rivetkit), or the runnable [`hello-world-rust`](https://github.com/rivet-dev/rivet/tree/main/examples/hello-world-rust) example.
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## Steps
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### Add Rivet
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Add the `rivetkit` crate and its companions:
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```sh
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cargo add rivetkit anyhow async-trait
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cargo add serde --features derive
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cargo add tokio --features full
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```
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### Define Your Actor
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Put the actor in `src/lib.rs` so both your server and your client can share the same types. An actor is a type that implements `Actor`, plus one `Handles` implementation for each action. Persisted state lives in `type State`; ephemeral runtime state is just fields on your actor struct.
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```rust src/lib.rs
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use std::{future::Future, pin::Pin, sync::Arc};
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use async_trait::async_trait;
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use rivetkit::prelude::*;
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use serde::{Deserialize, Serialize};
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type BoxFuture<T> = Pin<Box<dyn Future<Output = Result<T>> + Send>>;
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pub struct Counter;
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#[derive(Default, Serialize, Deserialize)]
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pub struct CounterState {
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pub count: i64,
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}
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#[derive(Serialize, Deserialize)]
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pub struct Increment {
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pub amount: i64,
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}
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impl Action for Increment {
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type Output = i64;
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const NAME: &'static str = "increment";
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}
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#[derive(Serialize, Deserialize)]
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pub struct NewCount {
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pub count: i64,
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}
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impl Event for NewCount {
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const NAME: &'static str = "newCount";
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}
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#[async_trait]
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impl Actor for Counter {
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type State = CounterState;
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type Input = ();
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type Actions = (Increment,);
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type Events = (NewCount,);
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type Queue = ();
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type ConnParams = ();
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type ConnState = ();
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type Action = action::Raw;
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async fn create_state(_ctx: &Ctx<Self>, _input: Self::Input) -> Result<Self::State> {
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Ok(CounterState::default())
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}
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async fn create(_ctx: &Ctx<Self>) -> Result<Self> {
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Ok(Self)
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}
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}
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impl Handles<Increment> for Counter {
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type Future = BoxFuture<i64>;
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fn handle(self: Arc<Self>, ctx: Ctx<Self>, action: Increment) -> Self::Future {
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Box::pin(async move {
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let count = {
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let mut state = ctx.state_mut();
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state.count += action.amount;
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state.count
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};
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ctx.emit(NewCount { count })?;
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Ok(count)
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})
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}
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}
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pub fn registry() -> Registry {
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let mut registry = Registry::new();
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registry.register_actor::<Counter>("counter");
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registry
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}
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```
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### Serve The Registry
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Your `src/main.rs` just starts the registry from the library:
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```rust src/main.rs
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#[tokio::main]
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async fn main() -> anyhow::Result<()> {
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counter::registry().start().await
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}
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```
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Replace `counter` with your crate name (the package `name` in `Cargo.toml`, with dashes as underscores).
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### Run The Server
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The Rust runtime connects to the Rivet Engine. Setting `RIVETKIT_ENGINE_AUTO_DOWNLOAD=1` lets the runtime download and cache a matching engine binary the first time you run, so there is nothing else to install:
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```sh
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RIVETKIT_ENGINE_AUTO_DOWNLOAD=1 cargo run
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```
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Your server now connects to the Rivet Engine on `http://localhost:6420`. Clients connect directly to the engine on this port.
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Visit [http://localhost:6420](http://localhost:6420) in your browser (or point your AI agent at it) to open the Rivet developer tools and inspect your actors live.
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Already have an engine binary? Set `RIVET_ENGINE_BINARY_PATH=/path/to/rivet-engine` to point at it instead. If you are working inside the [Rivet monorepo](https://github.com/rivet-dev/rivet), a local `cargo build -p rivet-engine` is discovered automatically from `target/debug`.
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### Connect To The Rivet Actor
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This code can run either in your frontend or within your backend:
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### Rust
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Add a `src/bin/client.rs` that imports the same actor types from your library. There is no need to redefine the actor on the client.
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```rust src/bin/client.rs
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use counter::{Counter, Increment, NewCount};
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use rivetkit::{
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client::{Client, ClientConfig},
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prelude::*,
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TypedClientExt,
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};
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#[tokio::main]
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async fn main() -> Result<()> {
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let client = Client::new(ClientConfig::new("http://localhost:6420").namespace("default"));
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let counter = client.get_or_create_typed_default::<Counter>("counter", ["my-counter"])?;
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let count = counter.send(Increment { amount: 3 }).await?;
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println!("New count: {count}");
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let connection = counter.connect();
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connection
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.on::<NewCount>(|event| println!("Count changed: {}", event.count))
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.await;
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connection.send(Increment { amount: 1 }).await?;
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Ok(())
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}
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```
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With the server still running, start the client in another terminal:
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```sh
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cargo run --bin client
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```
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See the [`hello-world-rust`](https://github.com/rivet-dev/rivet/tree/main/examples/hello-world-rust) example for a complete runnable counter.
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### TypeScript
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A TypeScript client can call your Rust actor by name through the same engine. Actor and action names are resolved at runtime, so the client is untyped here:
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```ts client.ts @nocheck
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import { createClient } from "rivetkit/client";
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const client = createClient("http://localhost:6420");
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const counter = client.counter.getOrCreate(["my-counter"]);
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const counterConnection = counter.connect();
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counterConnection.on("newCount", (event) => {
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console.log("Event count:", event.count);
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});
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const count = await counterConnection.increment(3);
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console.log("New count:", count);
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await counterConnection.increment(1);
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```
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See the [JavaScript client documentation](/docs/clients/javascript) for more information.
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### React
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```tsx Counter.tsx @nocheck
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import { createRivetKit } from "@rivetkit/react";
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import { useState } from "react";
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const { useActor } = createRivetKit("http://localhost:6420");
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function Counter() {
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const [count, setCount] = useState(0);
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const counter = useActor({
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name: "counter",
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key: ["my-counter"],
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});
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const increment = async () => {
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await counter.connection?.increment(1);
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};
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counter.useEvent("newCount", (event) => {
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setCount(event.count);
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});
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return (
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<div>
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<p>Count: {count}</p>
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<button onClick={increment}>Increment</button>
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</div>
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);
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}
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```
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See the [React documentation](/docs/clients/react) for more information.
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### Deploy
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## Next Steps
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- [API Reference](https://docs.rs/rivetkit) — Full `rivetkit` crate documentation on docs.rs.
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- [Actions](/docs/actors/actions) — Define the RPC surface clients call on your actor.
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- [State](/docs/actors/state) — Persist and load actor state across sleeps and restarts.
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- [Events](/docs/actors/events) — Broadcast realtime updates to connected clients.
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_Source doc path: /docs/actors/quickstart/rust_
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