Ensure connectivity to private HF spaces with SSE protocol (#8181)

* add msw setup and initialisation tests

* add changeset

* add eventsource polyfill for node and browser envs

* add changeset

* add changeset

* config tweak

* types

* update eventsource usage

* add changeset

* add walk_and_store_blobs improvements and add tests

* add changeset

* api_info tests

* add direct space URL link tests

* fix tests

* add view_api tests

* add post_message test

* tweak

* add spaces tests

* jwt and protocol tests

* add post_data tests

* test tweaks

* dynamically import eventsource

* revet eventsource imports

* add jwt param to sse requests

* add stream test

* add changeset

* add changeset

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>

.changeset/yummy-paws-eat.md

@@ -0,0 +1,7 @@
+---
+"@gradio/app": patch
+"@gradio/client": patch
+"gradio": patch
+---
+
+fix:Ensure connectivity to private HF spaces with SSE protocol

client/js/src/client.ts

@@ -36,6 +36,16 @@ export class NodeBlob extends Blob {
 	}
 }
 
+if (typeof window === "undefined") {
+	import("eventsource")
+		.then((EventSourceModule) => {
+			global.EventSource = EventSourceModule.default as any;
+		})
+		.catch((error) =>
+			console.error("Failed to load EventSource module:", error)
+		);
+}
+
 export class Client {
 	app_reference: string;
 	options: ClientOptions;
@@ -51,7 +61,7 @@ export class Client {
 	stream_status = { open: false };
 	pending_stream_messages: Record<string, any[][]> = {};
 	pending_diff_streams: Record<string, any[][]> = {};
-	event_callbacks: Record<string, () => Promise<void>> = {};
+	event_callbacks: Record<string, (data?: unknown) => Promise<void>> = {};
 	unclosed_events: Set<string> = new Set();
 	heartbeat_event: EventSource | null = null;
 

client/js/src/test/mock_eventsource.ts

@@ -0,0 +1,11 @@
+import { vi } from "vitest";
+
+Object.defineProperty(window, "EventSource", {
+	writable: true,
+	value: vi.fn().mockImplementation(() => ({
+		close: vi.fn(() => {}),
+		addEventListener: vi.fn(),
+		onmessage: vi.fn((_event: MessageEvent) => {}),
+		onerror: vi.fn((_event: Event) => {})
+	}))
+});

client/js/src/test/stream.test.ts

@@ -0,0 +1,67 @@
+import { vi } from "vitest";
+import { Client } from "../client";
+import { initialise_server } from "./server";
+
+import { describe, it, expect, afterEach } from "vitest";
+import "./mock_eventsource.ts";
+
+const server = initialise_server();
+
+beforeAll(() => server.listen());
+afterEach(() => server.resetHandlers());
+afterAll(() => server.close());
+
+describe("open_stream", () => {
+	let mock_eventsource: any;
+	let app: any;
+
+	beforeEach(async () => {
+		app = await Client.connect("hmb/hello_world");
+		app.eventSource_factory = vi.fn().mockImplementation(() => {
+			mock_eventsource = new EventSource("");
+			return mock_eventsource;
+		});
+	});
+
+	afterEach(() => {
+		vi.clearAllMocks();
+	});
+
+	it("should throw an error if config is not defined", () => {
+		app.config = undefined;
+
+		expect(() => {
+			app.open_stream();
+		}).toThrow("Could not resolve app config");
+	});
+
+	it("should connect to the SSE endpoint and handle messages", async () => {
+		app.open_stream();
+
+		const eventsource_mock_call = app.eventSource_factory.mock.calls[0][0];
+
+		expect(eventsource_mock_call.href).toMatch(
+			/https:\/\/hmb-hello-world\.hf\.space\/queue\/data\?session_hash/
+		);
+
+		expect(app.eventSource_factory).toHaveBeenCalledWith(eventsource_mock_call);
+
+		const onMessageCallback = mock_eventsource.onmessage;
+		const onErrorCallback = mock_eventsource.onerror;
+
+		const message = { msg: "hello jerry" };
+
+		onMessageCallback({ data: JSON.stringify(message) });
+		expect(app.stream_status.open).toBe(true);
+
+		expect(app.event_callbacks).toEqual({});
+		expect(app.pending_stream_messages).toEqual({});
+
+		const close_stream_message = { msg: "close_stream" };
+		onMessageCallback({ data: JSON.stringify(close_stream_message) });
+		expect(app.stream_status.open).toBe(false);
+
+		onErrorCallback({ data: JSON.stringify("404") });
+		expect(app.stream_status.open).toBe(false);
+	});
+});

client/js/src/utils/stream.ts

@@ -7,7 +7,8 @@ export function open_stream(this: Client): void {
 		unclosed_events,
 		pending_stream_messages,
 		stream_status,
-		config
+		config,
+		jwt
 	} = this;
 
 	if (!config) {
@@ -22,10 +23,16 @@ export function open_stream(this: Client): void {
 	}).toString();
 
 	let url = new URL(`${config.root}/queue/data?${params}`);
+
+	if (jwt) {
+		url.searchParams.set("__sign", jwt);
+	}
+
 	event_source = this.eventSource_factory(url);
 
 	if (!event_source) {
-		throw new Error("Cannot connect to sse endpoint: " + url.toString());
+		console.warn("Cannot connect to SSE endpoint: " + url.toString());
+		return;
 	}
 
 	event_source.onmessage = async function (event: MessageEvent) {
@@ -37,10 +44,8 @@ export function open_stream(this: Client): void {
 		const event_id = _data.event_id;
 		if (!event_id) {
 			await Promise.all(
-				Object.keys(event_callbacks).map(
-					(event_id) =>
-						// @ts-ignore
-						event_callbacks[event_id](_data) // todo: check event_callbacks
+				Object.keys(event_callbacks).map((event_id) =>
+					event_callbacks[event_id](_data)
 				)
 			);
 		} else if (event_callbacks[event_id] && config) {
@@ -70,7 +75,6 @@ export function open_stream(this: Client): void {
 	event_source.onerror = async function () {
 		await Promise.all(
 			Object.keys(event_callbacks).map((event_id) =>
-				// @ts-ignore
 				event_callbacks[event_id]({
 					msg: "unexpected_error",
 					message: BROKEN_CONNECTION_MSG

client/js/src/utils/submit.ts

@@ -368,11 +368,15 @@ export function submit(
 						}${params}`
 					);
 
+					if (this.jwt) {
+						url.searchParams.set("__sign", this.jwt);
+					}
+
 					event_source = this.eventSource_factory(url);
 
 					if (!event_source) {
-						throw new Error(
-							"Cannot connect to sse endpoint: " + url.toString()
+						return Promise.reject(
+							new Error("Cannot connect to SSE endpoint: " + url.toString())
 						);
 					}
 

js/app/package.json

@@ -77,8 +77,10 @@
 		"@gradio/utils": "workspace:^",
 		"@gradio/video": "workspace:^",
 		"@gradio/wasm": "workspace:^",
+		"@types/eventsource": "^1.1.15",
 		"cross-env": "^7.0.3",
 		"d3-dsv": "^3.0.1",
+		"eventsource": "^2.0.2",
 		"mime-types": "^2.1.34",
 		"postcss": "^8.4.21",
 		"postcss-prefix-selector": "^1.16.0"