# DocuVault Load Tests

Phase 6 load test suite targeting the D-04/D-05/D-06 SLA requirements.

## Prerequisites

1. Install load-test dependencies (host or dedicated venv — **not** the production container):

   ```bash
   pip install -r backend/requirements-dev.txt
   ```

2. Start the full stack:

   ```bash
   docker compose up
   ```

   Backend, PostgreSQL, and MinIO must all be healthy before running.

## Running the load test

```bash
locust --headless \
       --users 50 \
       --spawn-rate 10 \
       --run-time 5m \
       --host http://localhost:8000 \
       --csv backend/load_tests/results \
       -f backend/load_tests/locustfile.py
```

Exit code `0` = SLA targets met. Exit code `1` = at least one threshold breached.

## Environment variables

| Variable | Default | Description |
|----------|---------|-------------|
| `LOAD_TEST_EMAIL` | `loadtest@example.com` | Email used to register/login the load-test user |
| `LOAD_TEST_PASSWORD` | `Loadtest123!@#` | Password for the load-test account (meets AUTH-01 strength rules) |

Override before running:

```bash
LOAD_TEST_EMAIL=mytest@staging.example.com \
LOAD_TEST_PASSWORD='MyS3cure!Pass' \
locust --headless ...
```

## SLA thresholds (D-06)

| Metric | Threshold | On breach |
|--------|-----------|-----------|
| p95 response time | < 200 ms | exit code 1 |
| p99 response time | < 500 ms | exit code 1 |
| Error ratio | ≤ 1% | exit code 1 |

## Task weights (D-05 realistic session)

| Task | Weight | Endpoint |
|------|--------|----------|
| List documents | 5 | `GET /api/documents/` |
| Get document | 3 | `GET /api/documents/{id}` |
| Upload document | 2 | `POST /api/documents/upload` (direct multipart, `target_backend=minio`) |
| Refresh token | 1 | `POST /api/auth/refresh` |

## Credential strategy

`on_start()` uses **self-bootstrapping** (Option A): it calls `POST /api/auth/register`
first (idempotent — 409 is silently ignored if the user already exists), then logs in.
No manual seeding step required.

## Cleanup

Remove the load-test user from the database when no longer needed:

```bash
docker compose exec postgres psql -U docuvault -c \
    "DELETE FROM users WHERE email='loadtest@example.com';"
```

## Results

CSV files are written to `backend/load_tests/results_*.csv` by the `--csv` flag.
These files are gitignored. To view a summary after a headless run, add `--html backend/load_tests/report.html`.

## Notes

- Load tests run **outside** the production container — install on the host or a test venv.
- Do **not** run against a production URL without an explicit `--host` override and stakeholder sign-off.
- The synthetic upload file (`_FAKE_PDF`) is a minimal valid PDF — it will be stored in MinIO during the run and cleared when the load-test user is deleted.
