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100 lines
3.1 KiB
Python
100 lines
3.1 KiB
Python
"""限流计数后端契约测试(不连 Redis)。
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锁定两条必须成立的语义:
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1. 正常路径:窗口内计数递增,并把"剩余窗口秒数"作为 `Retry-After` 的来源返回;
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键首次创建(`TTL` 为 -1)时补一次过期,避免出现永不过期的脏计数键。
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2. **降级路径**:Redis 构造失败或命令失败一律返回 `None`(=无法判定),由调用方放行。
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限流是保护措施,不能因为 Redis 故障把正常请求全部拒掉——这条如果回归,故障时
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整个平台会 429 全灭。
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"""
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from typing import Any
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from app.infrastructure.rate_limiter import RedisCounterBackend
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class FakePipeline:
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def __init__(self, client: "FakeRedis") -> None:
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self._client = client
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async def __aenter__(self) -> "FakePipeline":
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return self
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async def __aexit__(self, *exc: object) -> bool:
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return False
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def incr(self, key: str) -> "FakePipeline":
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self._client.incr_keys.append(key)
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return self
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def ttl(self, key: str) -> "FakePipeline":
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self._client.ttl_keys.append(key)
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return self
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async def execute(self) -> list[Any]:
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if self._client.fail:
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raise ConnectionError("redis unavailable")
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self._client.count += 1
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return [self._client.count, self._client.ttl_value]
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class FakeRedis:
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def __init__(self, *, fail: bool = False, ttl_value: int = 42) -> None:
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self.fail = fail
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self.ttl_value = ttl_value
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self.count = 0
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self.incr_keys: list[str] = []
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self.ttl_keys: list[str] = []
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self.expired: list[tuple[str, int]] = []
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def pipeline(self, transaction: bool = False) -> FakePipeline:
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del transaction
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return FakePipeline(self)
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async def expire(self, key: str, seconds: int) -> bool:
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self.expired.append((key, seconds))
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return True
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def backend(client: Any) -> RedisCounterBackend:
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return RedisCounterBackend(
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"redis://unused", connect_timeout_seconds=0.1, client_factory=lambda: client
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)
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async def test_first_request_counts_one_and_reports_remaining_window() -> None:
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client = FakeRedis(ttl_value=42)
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result = await backend(client).increment("k", 60)
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assert result == (1, 42)
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assert client.incr_keys == ["k"]
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async def test_missing_ttl_is_repaired_with_window_expiry() -> None:
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"""`TTL` 为 -1 说明键没有过期时间:必须补一次,否则计数永远不归零。"""
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client = FakeRedis(ttl_value=-1)
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result = await backend(client).increment("k", 60)
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assert result == (1, 60)
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assert client.expired == [("k", 60)]
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async def test_redis_command_failure_degrades_to_unknown() -> None:
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client = FakeRedis(fail=True)
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assert await backend(client).increment("k", 60) is None
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async def test_client_construction_failure_degrades_to_unknown() -> None:
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def exploding_factory() -> Any:
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raise RuntimeError("redis not installed")
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instance = RedisCounterBackend(
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"redis://unused", connect_timeout_seconds=0.1, client_factory=exploding_factory
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)
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assert await instance.increment("k", 60) is None
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