Fix multiple workflows and add proper engine persistance

.changeset/cyan-geese-smell.md

@@ -0,0 +1,6 @@
+---
+"@cloudflare/workflows-shared": minor
+"miniflare": minor
+---
+
+Add proper engine persistance in .wrangler and fix multiple workflows in miniflare

fixtures/workflow-multiple/package.json

@@ -0,0 +1,17 @@
+{
+	"name": "my-workflow-multiple",
+	"private": true,
+	"scripts": {
+		"deploy": "wrangler deploy",
+		"start": "wrangler dev",
+		"test:ci": "vitest"
+	},
+	"devDependencies": {
+		"@cloudflare/workers-types": "^4.20241106.0",
+		"undici": "catalog:default",
+		"wrangler": "workspace:*"
+	},
+	"volta": {
+		"extends": "../../package.json"
+	}
+}

fixtures/workflow-multiple/src/index.ts

@@ -0,0 +1,90 @@
+import {
+	WorkerEntrypoint,
+	WorkflowEntrypoint,
+	WorkflowEvent,
+	WorkflowStep,
+} from "cloudflare:workers";
+
+type Params = {
+	name: string;
+};
+
+export class Demo extends WorkflowEntrypoint<{}, Params> {
+	async run(event: WorkflowEvent<Params>, step: WorkflowStep) {
+		const { timestamp, payload } = event;
+
+		await step.sleep("Wait", "1 second");
+
+		const result = await step.do("First step", async function () {
+			return {
+				output: "First step result",
+			};
+		});
+
+		await step.sleep("Wait", "1 second");
+
+		const result2 = await step.do("Second step", async function () {
+			return {
+				output: "workflow1",
+			};
+		});
+
+		return [result, result2, timestamp, payload, "workflow1"];
+	}
+}
+
+export class Demo2 extends WorkflowEntrypoint<{}, Params> {
+	async run(event: WorkflowEvent<Params>, step: WorkflowStep) {
+		const { timestamp, payload } = event;
+
+		await step.sleep("Wait", "1 second");
+
+		const result = await step.do("First step", async function () {
+			return {
+				output: "First step result",
+			};
+		});
+
+		await step.sleep("Wait", "1 second");
+
+		const result2 = await step.do("Second step", async function () {
+			return {
+				output: "workflow2",
+			};
+		});
+
+		return [result, result2, timestamp, payload, "workflow2"];
+	}
+}
+
+type Env = {
+	WORKFLOW: Workflow;
+	WORKFLOW2: Workflow;
+};
+
+export default class extends WorkerEntrypoint<Env> {
+	async fetch(req: Request) {
+		const url = new URL(req.url);
+		const id = url.searchParams.get("id");
+		const workflowName = url.searchParams.get("workflowName");
+
+		if (url.pathname === "/favicon.ico") {
+			return new Response(null, { status: 404 });
+		}
+		let workflowToUse =
+			workflowName == "2" ? this.env.WORKFLOW2 : this.env.WORKFLOW;
+
+		let handle: WorkflowInstance;
+		if (url.pathname === "/create") {
+			if (id === null) {
+				handle = await workflowToUse.create();
+			} else {
+				handle = await workflowToUse.create({ id });
+			}
+		} else {
+			handle = await workflowToUse.get(id);
+		}
+
+		return Response.json({ status: await handle.status(), id: handle.id });
+	}
+}

fixtures/workflow-multiple/tests/index.test.ts

@@ -0,0 +1,127 @@
+import { rm } from "fs/promises";
+import { resolve } from "path";
+import { fetch } from "undici";
+import { afterAll, beforeAll, describe, it, vi } from "vitest";
+import { runWranglerDev } from "../../shared/src/run-wrangler-long-lived";
+
+describe("Workflows", () => {
+	let ip: string,
+		port: number,
+		stop: (() => Promise<unknown>) | undefined,
+		getOutput: () => string;
+
+	beforeAll(async () => {
+		// delete previous run contents because of persistence
+		await rm(resolve(__dirname, "..") + "/.wrangler", {
+			force: true,
+			recursive: true,
+		});
+		({ ip, port, stop, getOutput } = await runWranglerDev(
+			resolve(__dirname, ".."),
+			["--port=0", "--inspector-port=0"]
+		));
+	});
+
+	afterAll(async () => {
+		await stop?.();
+	});
+
+	async function fetchJson(url: string) {
+		const response = await fetch(url, {
+			headers: {
+				"MF-Disable-Pretty-Error": "1",
+			},
+		});
+		const text = await response.text();
+
+		try {
+			return JSON.parse(text);
+		} catch (err) {
+			throw new Error(`Couldn't parse JSON:\n\n${text}`);
+		}
+	}
+
+	it("creates two instances with same id in two different workflows", async ({
+		expect,
+	}) => {
+		const createResult = {
+			id: "test",
+			status: {
+				status: "running",
+				output: [],
+			},
+		};
+
+		await Promise.all([
+			expect(
+				fetchJson(`http://${ip}:${port}/create?workflowName=1&id=test`)
+			).resolves.toStrictEqual(createResult),
+			expect(
+				fetchJson(`http://${ip}:${port}/create?workflowName=2&id=test`)
+			).resolves.toStrictEqual(createResult),
+		]);
+
+		const firstResult = {
+			id: "test",
+			status: {
+				status: "running",
+				output: [{ output: "First step result" }],
+			},
+		};
+		await Promise.all([
+			vi.waitFor(
+				async () => {
+					await expect(
+						fetchJson(`http://${ip}:${port}/status?workflowName=1&id=test`)
+					).resolves.toStrictEqual(firstResult);
+				},
+				{ timeout: 5000 }
+			),
+			vi.waitFor(
+				async () => {
+					await expect(
+						fetchJson(`http://${ip}:${port}/status?workflowName=2&id=test`)
+					).resolves.toStrictEqual(firstResult);
+				},
+				{ timeout: 5000 }
+			),
+		]);
+
+		await Promise.all([
+			await vi.waitFor(
+				async () => {
+					await expect(
+						fetchJson(`http://${ip}:${port}/status?workflowName=1&id=test`)
+					).resolves.toStrictEqual({
+						id: "test",
+						status: {
+							status: "complete",
+							output: [
+								{ output: "First step result" },
+								{ output: "workflow1" },
+							],
+						},
+					});
+				},
+				{ timeout: 5000 }
+			),
+			await vi.waitFor(
+				async () => {
+					await expect(
+						fetchJson(`http://${ip}:${port}/status?workflowName=2&id=test`)
+					).resolves.toStrictEqual({
+						id: "test",
+						status: {
+							status: "complete",
+							output: [
+								{ output: "First step result" },
+								{ output: "workflow2" },
+							],
+						},
+					});
+				},
+				{ timeout: 5000 }
+			),
+		]);
+	});
+});

fixtures/workflow-multiple/tests/tsconfig.json

@@ -0,0 +1,7 @@
+{
+	"extends": "@cloudflare/workers-tsconfig/tsconfig.json",
+	"compilerOptions": {
+		"types": ["node"]
+	},
+	"include": ["**/*.ts", "../../../node-types.d.ts"]
+}

fixtures/workflow-multiple/tsconfig.json

@@ -0,0 +1,13 @@
+{
+	"compilerOptions": {
+		"target": "ES2020",
+		"module": "CommonJS",
+		"lib": ["ES2020"],
+		"types": ["@cloudflare/workers-types"],
+		"moduleResolution": "node",
+		"noEmit": true,
+		"skipLibCheck": true
+	},
+	"include": ["**/*.ts"],
+	"exclude": ["tests"]
+}

fixtures/workflow-multiple/vitest.config.mts

@@ -0,0 +1,9 @@
+import { defineProject, mergeConfig } from "vitest/config";
+import configShared from "../../vitest.shared";
+
+export default mergeConfig(
+	configShared,
+	defineProject({
+		test: {},
+	})
+);

fixtures/workflow-multiple/wrangler.toml

@@ -0,0 +1,14 @@
+#:schema node_modules/wrangler/config-schema.json
+name = "my-workflow-demo"
+main = "src/index.ts"
+compatibility_date = "2024-10-22"
+
+[[workflows]]
+binding = "WORKFLOW"
+name = "my-workflow"
+class_name = "Demo"
+
+[[workflows]]
+binding = "WORKFLOW2"
+name = "my-workflow-2"
+class_name = "Demo2"

fixtures/workflow/tests/index.test.ts

@@ -1,3 +1,4 @@
+import { rm } from "fs/promises";
 import { resolve } from "path";
 import { fetch } from "undici";
 import { afterAll, beforeAll, describe, it, vi } from "vitest";
@@ -10,14 +11,14 @@ describe("Workflows", () => {
 		getOutput: () => string;
 
 	beforeAll(async () => {
+		// delete previous run contents because of persistence
+		await rm(resolve(__dirname, "..") + "/.wrangler", {
+			force: true,
+			recursive: true,
+		});
 		({ ip, port, stop, getOutput } = await runWranglerDev(
 			resolve(__dirname, ".."),
-			[
-				"--port=0",
-				"--inspector-port=0",
-				"--upstream-protocol=https",
-				"--host=prod.example.org",
-			]
+			["--port=0", "--inspector-port=0"]
 		));
 	});
 

packages/miniflare/src/plugins/workflows/index.ts

@@ -62,15 +62,20 @@ export const WORKFLOWS_PLUGIN: Plugin<
 			sharedOptions.workflowsPersist
 		);
 		await fs.mkdir(persistPath, { recursive: true });
-		const storageService: Service = {
-			name: WORKFLOWS_STORAGE_SERVICE_NAME,
+		// each workflow should get its own storage service
+		const storageServices: Service[] = Object.entries(
+			options.workflows ?? {}
+		).map<Service>(([_, workflow]) => ({
+			name: `${WORKFLOWS_STORAGE_SERVICE_NAME}-${workflow.name}`,
 			disk: { path: persistPath, writable: true },
-		};
+		}));
 
 		// this creates one miniflare service per workflow that the user's script has. we should dedupe engine definition later
 		const services = Object.entries(options.workflows ?? {}).map<Service>(
 			([_bindingName, workflow]) => {
-				const uniqueKey = `miniflare-workflows`;
+				// NOTE(lduarte): the engine unique namespace key must be unique per workflow definition
+				// otherwise workerd will crash because there's two equal DO namespaces
+				const uniqueKey = `miniflare-workflows-${workflow.name}`;
 
 				const workflowsBinding: Service = {
 					name: `${WORKFLOWS_PLUGIN_NAME}:${workflow.name}`,
@@ -90,8 +95,9 @@ export const WORKFLOWS_PLUGIN: Plugin<
 								preventEviction: true,
 							},
 						],
-						// this might conflict between workflows
-						durableObjectStorage: { localDisk: WORKFLOWS_STORAGE_SERVICE_NAME },
+						durableObjectStorage: {
+							localDisk: `${WORKFLOWS_STORAGE_SERVICE_NAME}-${workflow.name}`,
+						},
 						bindings: [
 							{
 								name: "ENGINE",
@@ -116,7 +122,7 @@ export const WORKFLOWS_PLUGIN: Plugin<
 			return [];
 		}
 
-		return [storageService, ...services];
+		return [...storageServices, ...services];
 	},
 
 	getPersistPath({ workflowsPersist }, tmpPath) {