Railway

Host your rooms’ nodes on Railway, and each pool is a Railway Service with no public domain. Railway runs the nodes only: give the pool a control plane from another cloud, or Rivet Cloud.

src/cluster.ts

import * as RivetHetzner from "@alchemy.run/rivet/Hetzner";
import * as RivetRailway from "@alchemy.run/rivet/Railway";
import * as Layer from "effect/Layer";

export const Cluster = RivetHetzner.ServerControlPlane("Rivet");

export const Default = RivetRailway.ServicePool("Default").pipe(Layer.provide(Cluster));

Install @alchemy.run/railway and finish Railway setup.

The pool

The pool gets a Railway Project of its own. Put it in one you have instead:

src/cluster.ts

export const Project = Railway.Project("Rooms");

export const Default = RivetRailway.ServicePool("Default", {
  project: Project,
  region: "us-west2",
}).pipe(Layer.provide(Cluster));

Rivet Services

ServicesPool runs Rivet Services as a Railway service with no public domain:

src/cluster.ts

export const Services = RivetRailway.ServicesPool("Services").pipe(Layer.provide(Cluster));

Call it from a Railway Service

src/api.ts

export default class Api extends Railway.Service<Api>()(
  "Api",
  { project: Project, main: import.meta.url },
  Effect.gen(function* () {
    const rooms = yield* Room;
    return {
      fetch: Effect.gen(function* () {
        const visitors = yield* rooms.getByName("lobby").join();
        return yield* HttpServerResponse.json({ visitors });
      }),
    };
  }),
) {}

Every option, with its default, is in the reference: ServicePool and ServicesPool.