File based dev registry

.changeset/yellow-coins-serve.md

@@ -0,0 +1,5 @@
+---
+"wrangler": patch
+---
+
+feat: Experimental file based service discovery when running multiple Wrangler instances locally. To try it out, make sure all your local Wrangler instances are running with the `--x-registry` flag.

fixtures/ai-app/tests/index.test.ts

@@ -27,8 +27,7 @@ describe("'wrangler dev' correctly renders pages", () => {
 		expect((content as Record<string, object>).run).toEqual("function");
 	});
 
-	// TODO: unskip when https://github.com/cloudflare/workerd/pull/2095 is merged and released
-	it.skip("ai binding properties", async ({ expect }) => {
+	it("ai binding properties", async ({ expect }) => {
 		const response = await fetch(`http://${ip}:${port}/`);
 		const content = await response.json();
 		expect((content as Record<string, object>).binding).toEqual({

fixtures/external-durable-objects-app/a/wrangler.toml

@@ -1,6 +1,11 @@
 name = "a"
+compatibility_date = "2024-06-10"
 
 [durable_objects]
 bindings = [
 	{ name = "MY_DO", class_name = "MyDurableObject" }
 ]
+
+[[migrations]]
+tag = "v1"
+new_classes = ["MyDurableObject"]

fixtures/external-durable-objects-app/b/wrangler.toml

@@ -1,4 +1,5 @@
 name = "b"
+compatibility_date = "2024-06-10"
 
 [durable_objects]
 bindings = [

fixtures/external-durable-objects-app/c/wrangler.toml

@@ -1,4 +1,5 @@
 name = "c"
+compatibility_date = "2024-06-10"
 
 [durable_objects]
 bindings = [

fixtures/external-durable-objects-app/tests/index.test.ts

@@ -1,5 +1,6 @@
 import { fork } from "child_process";
 import * as path from "path";
+import { setTimeout } from "timers/promises";
 import { fetch } from "undici";
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
 import { unstable_dev } from "wrangler";
@@ -8,7 +9,7 @@ import type { UnstableDevWorker } from "wrangler";
 
 // TODO: reenable when https://github.com/cloudflare/workers-sdk/pull/4241 lands
 // and improves reliability of this test.
-describe.skip(
+describe(
 	"Pages Functions",
 	() => {
 		let a: UnstableDevWorker;
@@ -26,15 +27,28 @@ describe.skip(
 		beforeAll(async () => {
 			a = await unstable_dev(path.join(__dirname, "../a/index.ts"), {
 				config: path.join(__dirname, "../a/wrangler.toml"),
+				experimental: {
+					fileBasedRegistry: true,
+					disableExperimentalWarning: true,
+				},
 			});
+			await setTimeout(1000);
 			b = await unstable_dev(path.join(__dirname, "../b/index.ts"), {
 				config: path.join(__dirname, "../b/wrangler.toml"),
+				experimental: {
+					fileBasedRegistry: true,
+					disableExperimentalWarning: true,
+				},
 			});
-
+			await setTimeout(1000);
 			c = await unstable_dev(path.join(__dirname, "../c/index.ts"), {
 				config: path.join(__dirname, "../c/wrangler.toml"),
+				experimental: {
+					fileBasedRegistry: true,
+					disableExperimentalWarning: true,
+				},
 			});
-
+			await setTimeout(1000);
 			dWranglerProcess = fork(
 				path.join(
 					"..",
@@ -48,10 +62,10 @@ describe.skip(
 				[
 					"pages",
 					"dev",
+					"--x-registry",
 					"public",
+					"--compatibility-date=2024-03-04",
 					"--do=PAGES_REFERENCED_DO=MyDurableObject@a",
-					"--port=0",
-					"--inspector-port=0",
 				],
 				{
 					stdio: ["ignore", "ignore", "ignore", "ipc"],
@@ -63,6 +77,7 @@ describe.skip(
 				dPort = parsedMessage.port;
 				dResolveReadyPromise(undefined);
 			});
+			await setTimeout(1000);
 		});
 
 		afterAll(async () => {
@@ -85,10 +100,7 @@ describe.skip(
 
 		it("connects up Durable Objects and keeps state across wrangler instances", async () => {
 			await dReadyPromise;
-
-			// Service registry is polled every 300ms,
-			// so let's give all the Workers a little time to find each other
-			await new Promise((resolve) => setTimeout(resolve, 700));
+			await setTimeout(1000);
 
 			const responseA = await a.fetch(`/`, {
 				headers: {

fixtures/external-service-bindings-app/tests/index.test.ts

@@ -29,7 +29,7 @@ type WranglerInstance = {
 	port: string;
 };
 
-describe.skip("Pages Functions", () => {
+describe("Pages Functions", () => {
 	let wranglerInstances: (WranglerInstance | UnstableDevWorker)[] = [];
 	let pagesAppPort: string;
 
@@ -38,34 +38,64 @@ describe.skip("Pages Functions", () => {
 			path.join(__dirname, "../module-worker-a/index.ts"),
 			{
 				config: path.join(__dirname, "../module-worker-a/wrangler.toml"),
+				experimental: {
+					fileBasedRegistry: true,
+					disableExperimentalWarning: true,
+				},
 			}
 		);
+		await setTimeout(1000);
+
 		wranglerInstances[1] = await unstable_dev(
 			path.join(__dirname, "../module-worker-b/index.ts"),
 			{
 				config: path.join(__dirname, "../module-worker-b/wrangler.toml"),
+				experimental: {
+					fileBasedRegistry: true,
+					disableExperimentalWarning: true,
+				},
 			}
 		);
+		await setTimeout(1000);
+
 		wranglerInstances[2] = await unstable_dev(
 			path.join(__dirname, "../service-worker-a/index.ts"),
 			{
 				config: path.join(__dirname, "../service-worker-a/wrangler.toml"),
+				experimental: {
+					fileBasedRegistry: true,
+					disableExperimentalWarning: true,
+				},
 			}
 		);
+		await setTimeout(1000);
+
 		wranglerInstances[3] = await unstable_dev(
 			path.join(__dirname, "../module-worker-c/index.ts"),
 			{
 				config: path.join(__dirname, "../module-worker-c/wrangler.toml"),
 				env: "staging",
+				experimental: {
+					fileBasedRegistry: true,
+					disableExperimentalWarning: true,
+				},
 			}
 		);
+		await setTimeout(1000);
+
 		wranglerInstances[4] = await unstable_dev(
 			path.join(__dirname, "../module-worker-d/index.ts"),
 			{
 				config: path.join(__dirname, "../module-worker-d/wrangler.toml"),
 				env: "production",
+				experimental: {
+					fileBasedRegistry: true,
+					disableExperimentalWarning: true,
+				},
 			}
 		);
+		await setTimeout(1000);
+
 		wranglerInstances[5] = await getWranglerInstance({
 			pages: true,
 			dirName: "pages-functions-app",
@@ -79,6 +109,7 @@ describe.skip("Pages Functions", () => {
 		});
 
 		pagesAppPort = wranglerInstances[5].port;
+		await setTimeout(1000);
 	});
 
 	afterAll(async () => {
@@ -111,7 +142,7 @@ describe.skip("Pages Functions", () => {
 		expect(json).toMatchInlineSnapshot(`
 			{
 			  "moduleWorkerCResponse": "Hello from module worker c (staging)",
-			  "moduleWorkerDResponse": "You should start up wrangler dev --local on the STAGING_MODULE_D_SERVICE worker",
+			  "moduleWorkerDResponse": "[wrangler] Couldn't find \`wrangler dev\` session for service "module-worker-d-staging" to proxy to",
 			}
 		`);
 	});
@@ -132,9 +163,9 @@ async function getWranglerInstance({
 			[
 				...(pages ? ["pages"] : []),
 				"dev",
+				"--x-registry",
 				...(pages ? ["public"] : ["index.ts"]),
 				"--local",
-				`--port=0`,
 				...extraArgs,
 			],
 			{

fixtures/get-bindings-proxy/tests/get-bindings-proxy.bindings.test.ts

@@ -1,12 +1,21 @@
 import { readdir } from "fs/promises";
 import path from "path";
+import { setTimeout } from "timers/promises";
 import {
 	D1Database,
 	DurableObjectNamespace,
 	Fetcher,
 	R2Bucket,
 } from "@cloudflare/workers-types";
-import { beforeEach, describe, expect, it, vi } from "vitest";
+import {
+	afterAll,
+	beforeAll,
+	beforeEach,
+	describe,
+	expect,
+	it,
+	vi,
+} from "vitest";
 import { unstable_dev } from "wrangler";
 import { getBindingsProxy } from "./shared";
 import type { KVNamespace } from "@cloudflare/workers-types";
@@ -36,18 +45,13 @@ describe("getBindingsProxy - bindings", () => {
 		vi.spyOn(console, "log").mockImplementation(() => {});
 	});
 
-	// Note: we're skipping the service workers and durable object tests
-	//       so there's no need to start separate workers right now, the
-	//       following beforeAll and afterAll should be un-commented when
-	//       we reenable the tests
-
-	// beforeAll(async () => {
-	// 	devWorkers = await startWorkers();
-	// });
+	beforeAll(async () => {
+		devWorkers = await startWorkers();
+	});
 
-	// afterAll(async () => {
-	// 	await Promise.allSettled(devWorkers.map((i) => i.stop()));
-	// });
+	afterAll(async () => {
+		await Promise.allSettled(devWorkers.map((i) => i.stop()));
+	});
 
 	describe("var bindings", () => {
 		it("correctly obtains var bindings from both wrangler.toml and .dev.vars", async () => {
@@ -134,11 +138,10 @@ describe("getBindingsProxy - bindings", () => {
 		}
 	});
 
-	// Note: the following test is skipped due to flakiness caused by the local registry not working reliably
-	//       when we run all our fixtures together (possibly because of race condition issues)
-	it.skip("provides service bindings to external local workers", async () => {
+	it("provides service bindings to external local workers", async () => {
 		const { bindings, dispose } = await getBindingsProxy<Bindings>({
 			configPath: wranglerTomlFilePath,
+			experimentalRegistry: true,
 		});
 		try {
 			const { MY_SERVICE_A, MY_SERVICE_B } = bindings;
@@ -164,11 +167,10 @@ describe("getBindingsProxy - bindings", () => {
 		await dispose();
 	});
 
-	// Note: the following test is skipped due to flakiness caused by the local registry not working reliably
-	//       when we run all our fixtures together (possibly because of race condition issues)
-	it.skip("correctly obtains functioning DO bindings (provided by external local workers)", async () => {
+	it("correctly obtains functioning DO bindings (provided by external local workers)", async () => {
 		const { bindings, dispose } = await getBindingsProxy<Bindings>({
 			configPath: wranglerTomlFilePath,
+			experimentalRegistry: true,
 		});
 		try {
 			const { MY_DO_A, MY_DO_B } = bindings;
@@ -235,11 +237,16 @@ async function startWorkers(): Promise<UnstableDevWorker[]> {
 	const workersDirPath = path.join(__dirname, "..", "workers");
 	const workers = await readdir(workersDirPath);
 	return await Promise.all(
-		workers.map((workerName) => {
+		workers.map(async (workerName) => {
 			const workerPath = path.join(workersDirPath, workerName);
+			await setTimeout(2000);
 			return unstable_dev(path.join(workerPath, "index.ts"), {
 				config: path.join(workerPath, "wrangler.toml"),
 				ip: "127.0.0.1",
+				experimental: {
+					fileBasedRegistry: true,
+					disableExperimentalWarning: true,
+				},
 			});
 		})
 	);

fixtures/service-bindings-app/tests/index.test.ts

@@ -1,25 +1,30 @@
 import path from "node:path";
+import { setTimeout } from "node:timers/promises";
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
 import { unstable_dev, UnstableDevWorker } from "wrangler";
 
-// TODO: reenable when https://github.com/cloudflare/workers-sdk/pull/4241 lands
-// and improves reliability of this test.
-describe.skip("Service Bindings", () => {
+describe("Service Bindings", () => {
 	let aWorker: UnstableDevWorker;
 
 	let bWorker: UnstableDevWorker;
 
 	beforeAll(async () => {
 		bWorker = await unstable_dev(path.join(__dirname, "../b/index.ts"), {
 			config: path.join(__dirname, "../b/wrangler.toml"),
+			experimental: {
+				fileBasedRegistry: true,
+				disableExperimentalWarning: true,
+			},
 		});
+		await setTimeout(1000);
 		aWorker = await unstable_dev(path.join(__dirname, "../a/index.ts"), {
 			config: path.join(__dirname, "../a/wrangler.toml"),
+			experimental: {
+				fileBasedRegistry: true,
+				disableExperimentalWarning: true,
+			},
 		});
-		// Service registry is polled every 300ms,
-		// so let's give worker A some time to find B
-
-		await new Promise((resolve) => setTimeout(resolve, 700));
+		await setTimeout(1000);
 	});
 
 	it("connects up Durable Objects and keeps state across wrangler instances", async () => {

packages/wrangler/package.json

@@ -74,6 +74,7 @@
 		"@esbuild-plugins/node-modules-polyfill": "^0.2.2",
 		"blake3-wasm": "^2.1.5",
 		"chokidar": "^3.5.3",
+		"date-fns": "^3.6.0",
 		"esbuild": "0.17.19",
 		"miniflare": "workspace:*",
 		"nanoid": "^3.3.3",