fix(tracker-web): probe platform health

dashboards/tracker-web/src/__tests__/health.test.ts

@@ -2,7 +2,7 @@
  * Tests for GET /api/health (tracker dashboard)
  */
 
-import { describe, it, expect, afterEach } from 'vitest';
+import { describe, it, expect, afterEach, vi } from 'vitest';
 
 import { GET } from '@/app/api/health/route';
 
@@ -11,12 +11,17 @@ describe('GET /api/health', () => {
 
   afterEach(() => {
     process.env = { ...originalEnv };
+    vi.unstubAllGlobals();
   });
 
-  it('returns ok when all required env vars are set', async () => {
+  it('returns ok when all required env vars are set and platform-service is healthy', async () => {
     process.env.PLATFORM_API_URL = 'http://localhost:4003';
     process.env.JWT_SECRET = 'test-secret';
     process.env.DEFAULT_PRODUCT_ID = 'test-product';
+    vi.stubGlobal(
+      'fetch',
+      vi.fn(async () => new Response(JSON.stringify({ status: 'ok' }), { status: 200 }))
+    );
 
     const res = await GET();
     expect(res.status).toBe(200);
@@ -30,7 +35,33 @@ describe('GET /api/health', () => {
         status: 'pass',
         message: '3 required vars set',
       },
+      {
+        name: 'platform-service',
+        status: 'pass',
+        message: 'healthy',
+      },
     ]);
+    expect(fetch).toHaveBeenCalledWith('http://localhost:4003/health', expect.any(Object));
+  });
+
+  it('returns degraded when platform-service health check fails', async () => {
+    process.env.PLATFORM_API_URL = 'http://localhost:4003';
+    process.env.JWT_SECRET = 'test-secret';
+    process.env.DEFAULT_PRODUCT_ID = 'test-product';
+    vi.stubGlobal(
+      'fetch',
+      vi.fn(async () => new Response(JSON.stringify({ status: 'degraded' }), { status: 503 }))
+    );
+
+    const res = await GET();
+    expect(res.status).toBe(503);
+    const data = await res.json();
+    expect(data.status).toBe('degraded');
+    expect(data.checks).toContainEqual({
+      name: 'platform-service',
+      status: 'fail',
+      message: 'HTTP 503',
+    });
   });
 
   it('returns degraded when env vars are missing', async () => {

dashboards/tracker-web/src/app/api/health/route.ts

@@ -7,6 +7,7 @@ interface Check {
 }
 
 const REQUIRED_ENV = ['PLATFORM_API_URL', 'JWT_SECRET', 'DEFAULT_PRODUCT_ID'];
+const PLATFORM_HEALTH_TIMEOUT_MS = 2_000;
 
 function checkEnvVars(): Check {
   const missing = REQUIRED_ENV.filter(key => !process.env[key]);
@@ -16,10 +17,42 @@ function checkEnvVars(): Check {
   return { name: 'env', status: 'pass', message: `${REQUIRED_ENV.length} required vars set` };
 }
 
+async function checkPlatformService(): Promise<Check> {
+  const baseUrl = process.env.PLATFORM_API_URL;
+  if (!baseUrl) {
+    return { name: 'platform-service', status: 'fail', message: 'PLATFORM_API_URL missing' };
+  }
+
+  const controller = new AbortController();
+  const timeout = setTimeout(() => controller.abort(), PLATFORM_HEALTH_TIMEOUT_MS);
+  try {
+    const res = await fetch(new URL('/health', baseUrl).toString(), {
+      cache: 'no-store',
+      signal: controller.signal,
+    });
+    if (!res.ok) {
+      return { name: 'platform-service', status: 'fail', message: `HTTP ${res.status}` };
+    }
+    return { name: 'platform-service', status: 'pass', message: 'healthy' };
+  } catch (err) {
+    return {
+      name: 'platform-service',
+      status: 'fail',
+      message: err instanceof Error ? err.message : 'health check failed',
+    };
+  } finally {
+    clearTimeout(timeout);
+  }
+}
+
 export async function GET() {
   const checks: Check[] = [];
 
-  checks.push(checkEnvVars());
+  const envCheck = checkEnvVars();
+  checks.push(envCheck);
+  if (envCheck.status === 'pass') {
+    checks.push(await checkPlatformService());
+  }
 
   const overall = checks.every(c => c.status === 'pass') ? 'ok' : 'degraded';