feat(serverless): make runner 0 config

packages/next-js/src/mod.ts

@@ -8,7 +8,7 @@ export const toNextHandler = (
 	inputConfig.disableServer = true;
 	inputConfig.disableActorDriver = true;
 
-	const { fetch } = registry.startServerless(inputConfig);
+	const { fetch } = registry.start(inputConfig);
 
 	const fetchWrapper = async (
 		request: Request,

packages/rivetkit/src/client/config.ts

@@ -19,8 +19,6 @@ export const ClientConfigSchema = z.object({
 		.optional()
 		.transform((x) => x ?? getEnvUniversal("RIVET_TOKEN")),
 
-	totalSlots: z.number().optional(),
-
 	headers: z.record(z.string()).optional().default({}),
 
 	/** Endpoint to connect to the Rivet engine. Can be configured via RIVET_ENGINE env var. */

packages/rivetkit/src/drivers/default.ts

@@ -10,7 +10,13 @@ import type { DriverConfig, RunConfig } from "@/registry/run-config";
 export function chooseDefaultDriver(runConfig: RunConfig): DriverConfig {
 	if (runConfig.endpoint && runConfig.driver) {
 		throw new UserError(
-			"Cannot specify both 'engine' and 'driver' in configuration",
+			"Cannot specify both 'endpoint' and 'driver' in configuration",
+		);
+	}
+
+	if (runConfig.runnerKind === "serverless" && !runConfig.endpoint) {
+		throw new UserError(
+			"Cannot use 'serverless' runnerKind without the 'endpoint' config set. This condition should not happen, since the endpoint should be configured by default by Rivet when using serverless runners.",
 		);
 	}
 

packages/rivetkit/src/drivers/engine/actor-driver.ts

@@ -92,9 +92,9 @@ export class EngineActorDriver implements ActorDriver {
 			endpoint: config.endpoint,
 			token: runConfig.token ?? config.token,
 			pegboardEndpoint: config.pegboardEndpoint,
-			namespace: config.namespace,
+			namespace: runConfig.namespace ?? config.namespace,
 			totalSlots: runConfig.totalSlots ?? config.totalSlots,
-			runnerName: config.runnerName,
+			runnerName: runConfig.runnerName ?? config.runnerName,
 			runnerKey: config.runnerKey,
 			metadata: {
 				inspectorToken: this.#runConfig.inspector.token(),

packages/rivetkit/src/manager/router.ts

@@ -50,6 +50,7 @@ import {
 	type Actor as ApiActor,
 } from "@/manager-api/actors";
 import { RivetIdSchema } from "@/manager-api/common";
+import type { ServerlessActorDriverBuilder } from "@/mod";
 import type { RegistryConfig } from "@/registry/config";
 import type { RunConfig } from "@/registry/run-config";
 import type { ActorOutput, ManagerDriver } from "./driver";
@@ -79,7 +80,7 @@ export function createManagerRouter(
 	registryConfig: RegistryConfig,
 	runConfig: RunConfig,
 	managerDriver: ManagerDriver,
-	serverlessActorDriverBuilder: (() => ActorDriver) | undefined,
+	serverlessActorDriverBuilder: ServerlessActorDriverBuilder | undefined,
 ): { router: Hono; openapi: OpenAPIHono } {
 	const router = new OpenAPIHono({ strict: false }).basePath(
 		runConfig.basePath,
@@ -121,10 +122,7 @@ export function createManagerRouter(
 
 function addServerlessRoutes(
 	runConfig: RunConfig,
-	serverlessActorDriverBuilder: (
-		token: string | undefined,
-		totalSlots: number | undefined,
-	) => ActorDriver,
+	serverlessActorDriverBuilder: ServerlessActorDriverBuilder,
 	router: OpenAPIHono,
 ) {
 	// Apply CORS
@@ -141,11 +139,18 @@ function addServerlessRoutes(
 	router.get("/start", async (c) => {
 		const token = c.req.header("x-rivet-token");
 		let totalSlots: number | undefined = parseInt(
-			c.req.header("x-rivetkit-total-slots") as any,
+			c.req.header("x-rivet-total-slots") as any,
+		);
+		if (!Number.isFinite(totalSlots)) totalSlots = undefined;
+		const runnerName = c.req.header("x-rivet-runner-name");
+		const namespace = c.req.header("x-rivet-namespace-id");
+
+		const actorDriver = serverlessActorDriverBuilder(
+			token,
+			totalSlots,
+			runnerName,
+			namespace,
 		);
-		if (isNaN(totalSlots)) totalSlots = undefined;
-
-		const actorDriver = serverlessActorDriverBuilder(token, totalSlots);
 		invariant(
 			actorDriver.serverlessHandleStart,
 			"missing serverlessHandleStart on ActorDriver",

packages/rivetkit/src/registry/mod.ts

@@ -24,6 +24,13 @@ import {
 } from "./run-config";
 import { crossPlatformServe } from "./serve";
 
+export type ServerlessActorDriverBuilder = (
+	token?: string,
+	totalSlots?: number,
+	runnerName?: string,
+	namespace?: string,
+) => ActorDriver;
+
 interface ServerOutput<A extends Registry<any>> {
 	/** Client to communicate with the actors. */
 	client: Client<A>;
@@ -72,6 +79,9 @@ export class Registry<A extends RegistryActors> {
 			config.disableActorDriver = true;
 			config.noWelcome = true;
 		}
+		if (config.runnerKind === "serverless") {
+			config.disableActorDriver = true;
+		}
 
 		// Configure getUpgradeWebSocket lazily so we can assign it in crossPlatformServe
 		let upgradeWebSocket: any;
@@ -117,6 +127,7 @@ export class Registry<A extends RegistryActors> {
 			console.log();
 		}
 
+		let serverlessActorDriverBuilder: undefined | ServerlessActorDriverBuilder;
 		// HACK: We need to find a better way to let the driver itself decide when to start the actor driver
 		// Create runner
 		//
@@ -128,117 +139,22 @@ export class Registry<A extends RegistryActors> {
 				managerDriver,
 				client,
 			);
-		}
-
-		const { router: hono } = createManagerRouter(
-			this.#config,
-			config,
-			managerDriver,
-			undefined,
-		);
-
-		// Start server
-		if (!config.disableServer) {
-			(async () => {
-				const out = await crossPlatformServe(hono, undefined);
-				upgradeWebSocket = out.upgradeWebSocket;
-			})();
-		}
-
-		return {
-			client,
-			fetch: hono.fetch.bind(hono),
-		};
-	}
-
-	public startServerless(inputConfig?: RunConfigInput): ServerOutput<this> {
-		const config = RunConfigSchema.parse(inputConfig);
-
-		// Configure logger
-		if (config.logging?.baseLogger) {
-			// Use provided base logger
-			configureBaseLogger(config.logging.baseLogger);
 		} else {
-			// Configure default logger with log level from config
-			// getPinoLevel will handle env variable priority
-			configureDefaultLogger(config.logging?.level);
-		}
-
-		// Choose the driver based on configuration
-		const driver = chooseDefaultDriver(config);
-
-		// TODO: Find cleaner way of disabling by default
-		if (driver.name === "engine") {
-			config.inspector.enabled = false;
-			config.disableServer = true;
-			config.disableActorDriver = true;
-		}
-		if (driver.name === "cloudflare-workers") {
-			config.inspector.enabled = false;
-			config.disableServer = true;
-			config.disableActorDriver = true;
-			config.noWelcome = true;
-		}
-
-		// Configure getUpgradeWebSocket lazily so we can assign it in crossPlatformServe
-		let upgradeWebSocket: any;
-		if (!config.getUpgradeWebSocket) {
-			config.getUpgradeWebSocket = () => upgradeWebSocket!;
-		}
-
-		// Create router
-		const managerDriver = driver.manager(this.#config, config);
-
-		// Create client
-		const client = createClientWithDriver<this>(managerDriver, config);
-
-		const driverLog = managerDriver.extraStartupLog?.() ?? {};
-		logger().info({
-			msg: "rivetkit ready",
-			driver: driver.name,
-			definitions: Object.keys(this.#config.use).length,
-			...driverLog,
-		});
-		if (config.inspector?.enabled && managerDriver.inspector) {
-			logger().info({ msg: "inspector ready", url: getInspectorUrl(config) });
-		}
-
-		// Print welcome information
-		if (!config.noWelcome) {
-			const displayInfo = managerDriver.displayInformation();
-			console.log();
-			console.log(`  RivetKit ${pkg.version} (${displayInfo.name})`);
-			console.log(`  - Endpoint:     http://127.0.0.1:6420`);
-			for (const [k, v] of Object.entries(displayInfo.properties)) {
-				const padding = " ".repeat(Math.max(0, 13 - k.length));
-				console.log(`  - ${k}:${padding}${v}`);
-			}
-			if (config.inspector?.enabled && managerDriver.inspector) {
-				console.log(`  - Inspector:    ${getInspectorUrl(config)}`);
-			}
-			console.log();
-		}
-
-		let serverlessActorDriverBuilder:
-			| ((token?: string, totalSlots?: number) => ActorDriver)
-			| undefined = (
-			token: string | undefined,
-			totalSlots: number | undefined,
-		) => {
-			// Override config
-			if (token) config.token = token;
-			if (totalSlots) config.totalSlots = totalSlots;
-
-			return driver.actor(this.#config, config, managerDriver, client);
-		};
-
-		// HACK: We need to find a better way to let the driver itself decide when to start the actor driver
-		// Create runner
-		//
-		// Even though we do not use the return value, this is required to start the code that will handle incoming actors
-		if (!config.disableActorDriver) {
-			const _actorDriver = serverlessActorDriverBuilder();
-			serverlessActorDriverBuilder = undefined;
+			serverlessActorDriverBuilder = (
+				token,
+				totalSlots,
+				runnerName,
+				namespace,
+			) => {
+				// Override config
+				if (token) config.token = token;
+				if (totalSlots) config.totalSlots = totalSlots;
+				if (runnerName) config.runnerName = runnerName;
+				if (namespace) config.namespace = namespace;
+
+				// Create new actor driver with updated config
+				return driver.actor(this.#config, config, managerDriver, client);
+			};
 		}
 
 		const { router: hono } = createManagerRouter(

packages/rivetkit/src/registry/run-config.ts

@@ -6,6 +6,7 @@ import { ClientConfigSchema } from "@/client/config";
 import { LogLevelSchema } from "@/common/log";
 import { InspectorConfigSchema } from "@/inspector/config";
 import type { ManagerDriverBuilder } from "@/manager/driver";
+import { getEnvUniversal } from "@/utils";
 
 type CorsOptions = NonNullable<Parameters<typeof cors>[0]>;
 
@@ -35,6 +36,22 @@ export const RunConfigSchema = ClientConfigSchema.extend({
 	/** @experimental */
 	disableActorDriver: z.boolean().optional().default(false),
 
+	/**
+	 * @experimental
+	 *
+	 * Whether to run runners normally or have them managed
+	 * serverlessly (by the Rivet Engine for example).
+	 */
+	runnerKind: z
+		.enum(["serverless", "normal"])
+		.optional()
+		.default(() =>
+			getEnvUniversal("RIVET_RUNNER_KIND") === "serverless"
+				? "serverless"
+				: "normal",
+		),
+	totalSlots: z.number().optional(),
+
 	/**
 	 * @experimental
 	 *