anti
f1e14280c0
Locust hit /health and /config on every @task(3), so each request was firing repo.get_total_logs() and two repo.get_state() calls against aiosqlite — filling the driver queue for data that changes on the order of seconds, not milliseconds. Both caches follow the shape already used by the existing Docker cache: - asyncio.Lock with double-checked TTL so concurrent callers collapse into one DB hit per 1s window. - _reset_* helpers called from tests/api/conftest.py::setup_db so the module-level cache can't leak across tests. tests/test_health_config_cache.py asserts 50 concurrent callers produce exactly 1 repo call, and the cache expires after TTL.
68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
"""
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TTL-cache contract: under concurrent load, N callers collapse to 1 repo hit
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per TTL window. Tests use fake repo objects — no real DB.
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"""
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import asyncio
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from unittest.mock import patch
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import pytest
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from decnet.web.router.health import api_get_health
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from decnet.web.router.config import api_get_config
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class _FakeRepo:
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def __init__(self):
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self.total_logs_calls = 0
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self.state_calls = 0
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async def get_total_logs(self):
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self.total_logs_calls += 1
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return 0
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async def get_state(self, name: str):
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self.state_calls += 1
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return {"name": name}
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@pytest.mark.asyncio
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async def test_db_cache_collapses_concurrent_calls():
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api_get_health._reset_db_cache()
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fake = _FakeRepo()
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with patch.object(api_get_health, "repo", fake):
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results = await asyncio.gather(*[api_get_health._check_database_cached() for _ in range(50)])
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assert all(r.status == "ok" for r in results)
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assert fake.total_logs_calls == 1
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@pytest.mark.asyncio
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async def test_db_cache_expires_after_ttl(monkeypatch):
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api_get_health._reset_db_cache()
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monkeypatch.setattr(api_get_health, "_DB_CHECK_INTERVAL", 0.05)
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fake = _FakeRepo()
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with patch.object(api_get_health, "repo", fake):
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await api_get_health._check_database_cached()
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await asyncio.sleep(0.1)
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await api_get_health._check_database_cached()
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assert fake.total_logs_calls == 2
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@pytest.mark.asyncio
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async def test_config_state_cache_collapses_concurrent_calls():
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api_get_config._reset_state_cache()
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fake = _FakeRepo()
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with patch.object(api_get_config, "repo", fake):
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results = await asyncio.gather(*[api_get_config._get_state_cached("config_limits") for _ in range(30)])
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assert all(r == {"name": "config_limits"} for r in results)
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assert fake.state_calls == 1
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@pytest.mark.asyncio
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async def test_config_state_cache_per_key():
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api_get_config._reset_state_cache()
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fake = _FakeRepo()
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with patch.object(api_get_config, "repo", fake):
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await api_get_config._get_state_cached("config_limits")
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await api_get_config._get_state_cached("config_globals")
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assert fake.state_calls == 2
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