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Oleg Maslov
278
packages/server/tests/local/sse-resilience.test.ts
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278
packages/server/tests/local/sse-resilience.test.ts
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/**
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* SSE Stream Resilience Tests (PRQ-040)
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*
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* Tests SSE connection behaviors at the HTTP level:
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* - Connection drop simulation: abort mid-stream, verify agent loop receives abort signal
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* - Notification SSE module exports and event emission
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* - Chat SSE endpoint validation and echo mode
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*
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* Note: Fastify inject() waits for the handler to complete, but SSE endpoints
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* keep the connection open indefinitely. For the notification stream we test
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* the module exports and event bus wiring. For the chat endpoint, inject()
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* works because echo mode (no LLM) completes and closes the stream.
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*/
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import { describe, it, expect, beforeAll, afterAll } from 'vitest';
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import fs from 'node:fs';
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import path from 'node:path';
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import os from 'node:os';
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import { EventEmitter } from 'node:events';
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import { MindDB, SessionStore, FrameStore } from '@waggle/core';
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import { buildLocalServer } from '../../src/local/index.js';
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import type { FastifyInstance } from 'fastify';
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import type { LlmProviderStatus } from '../../src/local/index.js';
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import type {
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NotificationEvent,
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SubagentStatusEvent,
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} from '../../src/local/routes/notifications.js';
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import { injectWithAuth } from '../test-utils.js';
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/**
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* Echo mode forces the chat endpoint to bypass the LLM. The test sets an
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* intentionally off-spec provider ('none' is not in the LlmProviderStatus
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* union) and an unreachable LiteLLM URL, so the cast at this boundary is
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* deliberate — the runtime value is the test's, not a real provider status.
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*/
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const ECHO_MODE_PROVIDER = {
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provider: 'none',
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health: 'unavailable',
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detail: 'Test: force echo mode',
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checkedAt: new Date().toISOString(),
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} as unknown as LlmProviderStatus;
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describe('SSE Stream Resilience', () => {
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let server: FastifyInstance;
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let tmpDir: string;
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beforeAll(async () => {
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tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'waggle-sse-resilience-'));
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// Create personal.mind (required by buildLocalServer)
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const personalPath = path.join(tmpDir, 'personal.mind');
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const mind = new MindDB(personalPath);
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const sessions = new SessionStore(mind);
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const frames = new FrameStore(mind);
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const s1 = sessions.create('sse-test');
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frames.createIFrame(s1.gop_id, 'SSE resilience test frame', 'normal');
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mind.close();
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server = await buildLocalServer({ dataDir: tmpDir });
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});
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afterAll(async () => {
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await server.close();
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fs.rmSync(tmpDir, { recursive: true, force: true });
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});
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// ── Connection drop simulation ──────────────────────────────────
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describe('Chat SSE connection drop', () => {
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it('chat endpoint sets up abort handling and completes in echo mode', async () => {
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// Force echo mode by marking LLM provider as unavailable AND
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// breaking the health endpoint URL so the HTTP probe also fails
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const prevProvider = server.agentState.llmProvider;
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const prevLitellmUrl = server.localConfig.litellmUrl;
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server.agentState.llmProvider = ECHO_MODE_PROVIDER;
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server.localConfig.litellmUrl = 'http://127.0.0.1:1'; // unreachable port
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const res = await injectWithAuth(server, {
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method: 'POST',
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url: '/api/chat',
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payload: { message: 'test abort handling' },
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});
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// Chat endpoint uses reply.hijack() which means inject() gets raw output.
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expect(res.statusCode).toBe(200);
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const body = res.body;
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// In echo mode (no LLM), we should see token events and a done event
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expect(body).toContain('event: token');
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expect(body).toContain('event: done');
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// The done event should contain the echo response mentioning the message
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expect(body).toContain('test abort handling');
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// Restore provider
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server.agentState.llmProvider = prevProvider;
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server.localConfig.litellmUrl = prevLitellmUrl;
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});
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it('returns 400 when message is missing', async () => {
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const res = await injectWithAuth(server, {
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method: 'POST',
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url: '/api/chat',
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payload: {},
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});
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expect(res.statusCode).toBe(400);
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const body = res.json();
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expect(body.error).toBe('message is required');
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});
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it('echo mode includes "local mode" indicator in response', async () => {
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// Force echo mode: set provider unavailable AND break health probe URL
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const prevProvider = server.agentState.llmProvider;
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const prevLitellmUrl = server.localConfig.litellmUrl;
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server.agentState.llmProvider = ECHO_MODE_PROVIDER;
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server.localConfig.litellmUrl = 'http://127.0.0.1:1'; // unreachable port
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const res = await injectWithAuth(server, {
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method: 'POST',
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url: '/api/chat',
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payload: { message: 'echo test' },
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});
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expect(res.statusCode).toBe(200);
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// Echo mode should mention "local mode" or "no LLM proxy"
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expect(res.body).toContain('local mode');
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// Restore provider
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server.agentState.llmProvider = prevProvider;
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server.localConfig.litellmUrl = prevLitellmUrl;
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});
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});
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// ── Notification SSE module and event wiring ────────────────────
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describe('Notification SSE module', () => {
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it('exports notificationRoutes function', async () => {
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const mod = await import('../../src/local/routes/notifications.js');
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expect(mod.notificationRoutes).toBeDefined();
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expect(typeof mod.notificationRoutes).toBe('function');
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});
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it('exports emitNotification function', async () => {
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const mod = await import('../../src/local/routes/notifications.js');
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expect(mod.emitNotification).toBeDefined();
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expect(typeof mod.emitNotification).toBe('function');
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});
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it('emitNotification emits on the eventBus', async () => {
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const { emitNotification } = await import('../../src/local/routes/notifications.js');
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const eventBus = new EventEmitter();
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const events: NotificationEvent[] = [];
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eventBus.on('notification', (data: NotificationEvent) => events.push(data));
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const fakeFastify = { eventBus } as unknown as FastifyInstance;
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emitNotification(fakeFastify, {
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title: 'Test SSE',
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body: 'Testing event emission',
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category: 'agent',
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});
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expect(events).toHaveLength(1);
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expect(events[0].type).toBe('notification');
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expect(events[0].title).toBe('Test SSE');
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expect(events[0].body).toBe('Testing event emission');
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expect(events[0].category).toBe('agent');
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expect(events[0].timestamp).toBeDefined();
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});
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it('emitNotification is no-op when eventBus is missing', async () => {
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const { emitNotification } = await import('../../src/local/routes/notifications.js');
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const fakeFastify = {} as unknown as FastifyInstance; // No eventBus
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// Should not throw
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expect(() => {
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emitNotification(fakeFastify, {
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title: 'No bus',
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body: 'Should not crash',
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category: 'cron',
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});
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}).not.toThrow();
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});
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it('emitSubagentStatus emits on the eventBus', async () => {
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const { emitSubagentStatus } = await import('../../src/local/routes/notifications.js');
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const eventBus = new EventEmitter();
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const events: SubagentStatusEvent[] = [];
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eventBus.on('subagent_status', (data: SubagentStatusEvent) => events.push(data));
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const fakeFastify = { eventBus } as unknown as FastifyInstance;
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emitSubagentStatus(fakeFastify, 'ws-1', [
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{
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id: 'agent-1',
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name: 'Researcher',
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role: 'researcher',
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status: 'running',
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task: 'Find info',
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toolsUsed: ['web_search'],
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},
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]);
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expect(events).toHaveLength(1);
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expect(events[0].type).toBe('subagent_status');
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expect(events[0].workspaceId).toBe('ws-1');
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expect(events[0].agents).toHaveLength(1);
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expect(events[0].agents[0].name).toBe('Researcher');
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});
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});
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// ── Multiple concurrent chat streams ────────────────────────────
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describe('Multiple concurrent SSE connections', () => {
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it('two chat streams complete independently in echo mode', async () => {
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// Force echo mode: set provider unavailable AND break health probe URL
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const prevProvider = server.agentState.llmProvider;
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const prevLitellmUrl = server.localConfig.litellmUrl;
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server.agentState.llmProvider = ECHO_MODE_PROVIDER;
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server.localConfig.litellmUrl = 'http://127.0.0.1:1'; // unreachable port
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// Open two chat requests simultaneously — both should complete in echo mode
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const [res1, res2] = await Promise.all([
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injectWithAuth(server, {
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method: 'POST',
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url: '/api/chat',
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payload: { message: 'stream one' },
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}),
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injectWithAuth(server, {
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method: 'POST',
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url: '/api/chat',
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payload: { message: 'stream two' },
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}),
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]);
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// Both should complete successfully
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expect(res1.statusCode).toBe(200);
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expect(res2.statusCode).toBe(200);
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// Each should contain its own message in the echo
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expect(res1.body).toContain('stream one');
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expect(res2.body).toContain('stream two');
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// Both should have the SSE structure
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expect(res1.body).toContain('event: done');
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expect(res2.body).toContain('event: done');
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// Restore provider
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server.agentState.llmProvider = prevProvider;
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server.localConfig.litellmUrl = prevLitellmUrl;
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});
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it('event bus delivers to multiple listeners independently', async () => {
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const { emitNotification } = await import('../../src/local/routes/notifications.js');
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const eventBus = new EventEmitter();
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const listener1Events: NotificationEvent[] = [];
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const listener2Events: NotificationEvent[] = [];
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eventBus.on('notification', (data: NotificationEvent) => listener1Events.push(data));
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eventBus.on('notification', (data: NotificationEvent) => listener2Events.push(data));
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const fakeFastify = { eventBus } as unknown as FastifyInstance;
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emitNotification(fakeFastify, {
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title: 'Broadcast',
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body: 'Goes to all listeners',
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category: 'agent',
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});
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// Both listeners should receive the same event
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expect(listener1Events).toHaveLength(1);
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expect(listener2Events).toHaveLength(1);
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expect(listener1Events[0].title).toBe('Broadcast');
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expect(listener2Events[0].title).toBe('Broadcast');
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});
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});
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});
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