test(load): k6 smoke for 100 wave listeners and 20 rps suggest (M7)

Three minutes of wave sessions with stream starts, play events and next batches
alongside a steady suggest load; thresholds follow the documented p95 targets.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/load/smoke.js

@@ -0,0 +1,115 @@
+// Нагрузочный smoke перед релизом (docs/testing.md#нагрузочный-smoke): 100 одновременных слушателей волны
+// и 20 запросов подсказок поиска в секунду в течение 3 минут; пороги — цели из docs/api.md и
+// docs/recommendations.md. Запуск (k6 ≥ 0.50):
+//   k6 run -e BASE_URL=https://music.example.com -e PIPU_USER=loadtest -e PIPU_PASSWORD=… tests/load/smoke.js
+// Пользователь — обычный (role=user), заведённый для теста: его история и лайки засоряются.
+import { check, sleep } from 'k6';
+import http from 'k6/http';
+
+const BASE = (__ENV.BASE_URL || 'http://localhost:8080').replace(/\/$/, '');
+const DURATION = __ENV.DURATION || '3m';
+const LISTENERS = Number(__ENV.LISTENERS || 100);
+const SUGGEST_RPS = Number(__ENV.SUGGEST_RPS || 20);
+
+export const options = {
+  scenarios: {
+    listeners: { executor: 'constant-vus', vus: LISTENERS, duration: DURATION, exec: 'listen' },
+    suggest: {
+      executor: 'constant-arrival-rate',
+      rate: SUGGEST_RPS,
+      timeUnit: '1s',
+      duration: DURATION,
+      preAllocatedVUs: 10,
+      maxVUs: 40,
+      exec: 'suggest',
+    },
+  },
+  thresholds: {
+    'http_req_duration{name:suggest}': ['p(95)<50'],
+    'http_req_duration{name:wave_next}': ['p(95)<150'],
+    'http_req_duration{name:wave_start}': ['p(95)<300'],
+    'http_req_duration{name:stream}': ['p(95)<300'], // первые 64 КБ — время до начала звука
+    'http_req_duration{name:events}': ['p(95)<100'],
+    http_req_failed: ['rate<0.01'],
+    checks: ['rate>0.99'],
+  },
+};
+
+const json = (token) => ({
+  headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${token}` },
+});
+
+export function setup() {
+  const res = http.post(
+    `${BASE}/api/v1/auth/login`,
+    JSON.stringify({
+      username: __ENV.PIPU_USER,
+      password: __ENV.PIPU_PASSWORD,
+      client_type: 'android',
+      device_name: 'k6 load smoke',
+    }),
+    { headers: { 'Content-Type': 'application/json' } },
+  );
+  if (res.status !== 200) throw new Error(`login: ${res.status} ${res.body}`);
+  return { token: res.json('access_token') };
+}
+
+function uuid() {
+  // v4 — для id событий (дубли отбрасываются сервером, поэтому уникальность важна)
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+    const r = (Math.random() * 16) | 0;
+    return (c === 'x' ? r : (r & 0x3) | 0x8).toString(16);
+  });
+}
+
+// Слушатель: волна → по каждому треку начало потока и события → следующая пачка с отзывами.
+export function listen(data) {
+  const p = json(data.token);
+  const start = http.post(`${BASE}/api/v1/wave/sessions`, JSON.stringify({}), { ...p, tags: { name: 'wave_start' } });
+  if (!check(start, { 'wave started': (r) => r.status === 200 || r.status === 201 })) {
+    sleep(5);
+    return;
+  }
+  const session = start.json('session_id');
+  let tracks = start.json('tracks') || [];
+  for (let batch = 0; batch < 3 && tracks.length > 0; batch++) {
+    const feedback = [];
+    for (const t of tracks) {
+      const s = http.get(`${BASE}${t.stream_url}`, { headers: { Range: 'bytes=0-65535' }, tags: { name: 'stream' } });
+      check(s, { 'stream starts': (r) => r.status === 206 || r.status === 200 });
+      const now = new Date();
+      const outcome = Math.random() < 0.3 ? 'skip_early' : 'complete';
+      const played = outcome === 'complete' ? 180000 : 8000;
+      const ev = http.post(
+        `${BASE}/api/v1/events`,
+        JSON.stringify({
+          events: [
+            { id: uuid(), type: 'play_start', track_id: t.id, occurred_at: new Date(now - played).toISOString(), position_ms: 0, context_type: 'wave', context_id: session },
+            { id: uuid(), type: 'play_end', track_id: t.id, occurred_at: now.toISOString(), position_ms: played, played_ms: played, context_type: 'wave', context_id: session },
+          ],
+        }),
+        { ...p, tags: { name: 'events' } },
+      );
+      check(ev, { 'events accepted': (r) => r.status === 200 });
+      feedback.push({ track_id: t.id, outcome });
+      sleep(1 + Math.random() * 2); // «слушает» — запросы реального клиента редкие
+    }
+    const next = http.post(`${BASE}/api/v1/wave/sessions/${session}/next`, JSON.stringify({ feedback }), {
+      ...p,
+      tags: { name: 'wave_next' },
+    });
+    if (!check(next, { 'wave next': (r) => r.status === 200 })) break;
+    tracks = next.json('tracks') || [];
+  }
+}
+
+const QUERIES = ['ки', 'кино', 'mo', 'mozart', 'the', 'love', 'ghbdtn', 'a', 'нау', 'rock', 'би', 'queen', 'ле', 'jazz'];
+
+export function suggest(data) {
+  const q = QUERIES[Math.floor(Math.random() * QUERIES.length)];
+  const r = http.get(`${BASE}/api/v1/search/suggest?q=${encodeURIComponent(q)}`, {
+    headers: { Authorization: `Bearer ${data.token}` },
+    tags: { name: 'suggest' },
+  });
+  check(r, { 'suggest ok': (x) => x.status === 200 });
+}