iomgaa
ab1c47ebcc
asdict keeps the enum and json.dumps writes it as a string because StrEnum is a str subclass, but nothing turns it back on the way in, so a cache hit returned a plain str where the annotation promised an enum. Verified end to end rather than assumed from the subclass relation. A value outside the domain now raises inside the existing guard and the call falls back to source, which is the right direction for a poisoned or stale cache entry. Entries written before this column existed still replay: the guard checks for the key first, and a test pins that, since turning it into an unconditional conversion would quietly turn every pre-upgrade entry into a permanent miss.
425 lines
17 KiB
Python
425 lines
17 KiB
Python
"""CacheMW 与缓存 key 公式测试(ARCH §7.5: 防毒化 key、命中重建、静默降级)。"""
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import dataclasses
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import hashlib
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import json
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import pytest
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from polygateway.backends.memory.cache import InMemoryCache
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from polygateway.errors import ResultInvalidError, TransientError
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from polygateway.middleware.cache import CacheMW, build_cache_key, digest_messages
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from polygateway.middleware.telemetry import TelemetryEmitter
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from polygateway.types import ChatRequest, LLMResponse, SourceConfig, ThinkingObservation
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_MSGS = [{"role": "user", "content": "hi"}]
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def _resp(content="cached", **overrides):
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base = {
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"content": content,
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"thinking": "",
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"model": "m",
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"provider": "p",
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"prompt_tokens": 1,
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"completion_tokens": 2,
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"latency_ms": 30,
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"ttft_ms": 5.0,
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"max_inter_token_ms": 2.0,
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"cache_hit": False,
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"call_id": "orig",
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"source_name": "s1",
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"usage_source": "measured",
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}
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base.update(overrides)
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return LLMResponse(**base)
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class TestKeyFormula:
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def test_same_request_same_key(self):
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k1 = build_cache_key("m", _MSGS, "proj", None)
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k2 = build_cache_key("m", _MSGS, "proj", None)
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assert k1 == k2 and k1.startswith("pgw:cache:")
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@pytest.mark.parametrize(
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("a", "b"),
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[
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(("m1", _MSGS, "proj", None), ("m2", _MSGS, "proj", None)),
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(("m", _MSGS, "proj", None), ("m", _MSGS, "tenant2", None)),
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(("m", _MSGS, "proj", None), ("m", _MSGS, "proj", "epoch2")),
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(("m", _MSGS, "proj", "s1"), ("m", _MSGS, "proj", "s2")),
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(("m", _MSGS, "proj", None), ("m", [{"role": "user", "content": "yo"}], "proj", None)),
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],
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)
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def test_any_dimension_change_changes_key(self, a, b):
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assert build_cache_key(*a) != build_cache_key(*b)
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def test_empty_sampling_keeps_legacy_key(self):
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"""空采样参数时键形逐字不变,存量缓存不被全量作废(issue #4 决策 C)。
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golden 值取自加 sampling 维度之前的实现,不得随实现漂移。
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"""
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assert build_cache_key("qwen-max", [{"role": "user", "content": "hi"}], "proj", None) == (
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"pgw:cache:c54544e8672f4c91373b4a72716a88497445b440b89445aa5379b356b228f58b"
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)
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assert build_cache_key("qwen-max", [{"role": "user", "content": "hi"}], "proj", "s1") == (
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"pgw:cache:eed9cd9cc06acc0dedf4f337b74e06ed3482afdc30fa2acedd194f6cc1df33bf"
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)
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def test_differing_seed_changes_key(self):
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"""issue #4 的直接回归: 5 个 seed 若共用一个 key,标准差会恒为 0。"""
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k1 = build_cache_key("m", _MSGS, "proj", None, sampling={"seed": 1})
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k2 = build_cache_key("m", _MSGS, "proj", None, sampling={"seed": 2})
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assert k1 != k2
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def test_sampling_key_order_irrelevant(self):
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k1 = build_cache_key("m", _MSGS, "proj", None, sampling={"seed": 1, "temperature": 0})
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k2 = build_cache_key("m", _MSGS, "proj", None, sampling={"temperature": 0, "seed": 1})
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assert k1 == k2
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def test_empty_sampling_equals_omitted(self):
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"""空 dict 与不传须同键,否则升级后存量缓存全部 miss。"""
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assert build_cache_key("m", _MSGS, "proj", None, sampling={}) == build_cache_key(
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"m", _MSGS, "proj", None
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)
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def test_multimodal_part_digested_not_inlined(self):
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big_b64 = "data:image/png;base64," + "A" * 1_000_000
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messages = [
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{
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"role": "user",
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"content": [
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{"type": "image_url", "image_url": {"url": big_b64}},
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{"type": "text", "text": "describe"},
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],
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}
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]
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digested = digest_messages(messages)
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payload = json.dumps(digested, ensure_ascii=False)
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assert len(payload) < 500 # 大图不进 canonical_json
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expected = hashlib.sha256(big_b64.encode()).hexdigest()
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assert expected in payload # 但字节变化仍改变 key
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# 图像字节变化 → key 变
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messages2 = [
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{
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"role": "user",
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"content": [
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{"type": "image_url", "image_url": {"url": big_b64[:-1] + "B"}},
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{"type": "text", "text": "describe"},
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],
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}
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]
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assert build_cache_key("m", messages, "p", None) != build_cache_key(
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"m", messages2, "p", None
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)
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class _Terminal:
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def __init__(self, response):
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self.response = response
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self.calls = 0
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async def __call__(self, request):
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self.calls += 1
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if isinstance(self.response, Exception):
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raise self.response
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return self.response
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def _mw(backend, **kwargs):
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defaults = {
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"backend": backend,
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"model_fingerprint": "m",
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"default_namespace": "proj",
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"ttl_s": 3600,
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}
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defaults.update(kwargs)
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return CacheMW(**defaults)
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class TestCacheFlow:
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async def test_miss_then_hit_with_fresh_call_id(self):
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backend = InMemoryCache()
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mw = _mw(backend)
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terminal = _Terminal(_resp())
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first = await mw(ChatRequest(messages=_MSGS), terminal)
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assert first.cache_hit is False and terminal.calls == 1
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second = await mw(ChatRequest(messages=_MSGS), terminal)
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assert second.cache_hit is True and second.latency_ms == 0
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assert second.content == "cached"
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assert second.call_id != first.call_id # 命中生成独立 cache_call_id
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assert terminal.calls == 1 # 未再触达内层
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async def test_differing_sampling_does_not_hit(self):
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"""issue #4 的中间件层回归: 逐 rollout 变 seed 必须回源,不得复用响应。"""
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backend = InMemoryCache()
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mw = _mw(backend)
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terminal = _Terminal(_resp())
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await mw(ChatRequest(messages=_MSGS, sampling={"seed": 1}), terminal)
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await mw(ChatRequest(messages=_MSGS, sampling={"seed": 2}), terminal)
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assert terminal.calls == 2 # 两次都回源
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# 同 seed 才命中
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third = await mw(ChatRequest(messages=_MSGS, sampling={"seed": 1}), terminal)
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assert third.cache_hit is True and terminal.calls == 2
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async def test_structured_injection_does_not_pollute_key(self):
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"""CacheMW 读 sampling 而非 overlay: 结构化注入不该改变缓存身份。"""
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backend = InMemoryCache()
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mw = _mw(backend)
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terminal = _Terminal(_resp())
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await mw(ChatRequest(messages=_MSGS, sampling={"seed": 1}), terminal)
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polluted = ChatRequest(
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messages=_MSGS,
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sampling={"seed": 1},
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overlay={"seed": 1, "response_format": {"type": "json_object"}},
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)
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assert (await mw(polluted, terminal)).cache_hit is True
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assert terminal.calls == 1
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async def test_per_call_namespace_overrides_default(self):
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backend = InMemoryCache()
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mw = _mw(backend)
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terminal = _Terminal(_resp())
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await mw(ChatRequest(messages=_MSGS, cache_namespace="tenant-a"), terminal)
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# 另一租户不得命中
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await mw(ChatRequest(messages=_MSGS, cache_namespace="tenant-b"), terminal)
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assert terminal.calls == 2
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async def test_failure_not_cached(self):
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backend = InMemoryCache()
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mw = _mw(backend)
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failing = _Terminal(TransientError("boom"))
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with pytest.raises(TransientError):
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await mw(ChatRequest(messages=_MSGS), failing)
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ok = _Terminal(_resp())
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await mw(ChatRequest(messages=_MSGS), ok)
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assert ok.calls == 1 # 失败未被固化,正常回源
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async def test_ttl_expiry(self):
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t = {"now": 0.0}
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backend = InMemoryCache(now=lambda: t["now"])
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mw = _mw(backend, ttl_s=100)
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terminal = _Terminal(_resp())
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await mw(ChatRequest(messages=_MSGS), terminal)
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t["now"] = 101.0
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await mw(ChatRequest(messages=_MSGS), terminal)
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assert terminal.calls == 2
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class TestObservabilityFieldsOnHit:
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"""issue #3 决策 B1: 命中行原样回放,与 model/prompt_tokens 同一口径。"""
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async def test_fields_replayed_on_hit(self):
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backend = InMemoryCache()
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mw = _mw(backend)
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terminal = _Terminal(
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_resp(cached_prompt_tokens=64, model_reported="MiniMax-Text-01-250321")
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)
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await mw(ChatRequest(messages=_MSGS), terminal)
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hit = await mw(ChatRequest(messages=_MSGS), terminal)
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assert hit.cache_hit is True
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assert hit.cached_prompt_tokens == 64
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assert hit.model_reported == "MiniMax-Text-01-250321"
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async def test_legacy_cache_entry_without_new_keys_rehydrates(self):
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"""旧格式条目(无这两个键)必须照常重建为 None,不得抛异常回源。"""
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backend = InMemoryCache()
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mw = _mw(backend)
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key = build_cache_key("m", _MSGS, "proj", None)
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legacy = {
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"content": "legacy",
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"thinking": "",
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"model": "m",
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"provider": "p",
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"prompt_tokens": 1,
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"completion_tokens": 2,
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"latency_ms": 30,
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"ttft_ms": 5.0,
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"max_inter_token_ms": 2.0,
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"cache_hit": False,
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"call_id": "orig",
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"source_name": "s1",
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"cost": None,
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"usage_source": "measured",
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}
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await backend.set(key, json.dumps(legacy), ttl_s=100)
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terminal = _Terminal(_resp())
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hit = await mw(ChatRequest(messages=_MSGS), terminal)
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assert hit.content == "legacy" and terminal.calls == 0 # 真的走了缓存
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assert hit.cached_prompt_tokens is None and hit.model_reported is None
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class TestThinkingObservationRehydration:
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"""issue #16/#17: 命中回放必须复活成枚举实例,而不是 JSON 里的裸 str。
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裸 str 与字段注解分叉,下游拿 `resp.thinking_observation is
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ThinkingObservation.OBSERVED` 判等会在缓存命中路径上静默为 False。
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"""
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async def test_hit_replays_enum_instance_not_bare_str(self):
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backend = InMemoryCache()
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mw = _mw(backend)
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terminal = _Terminal(_resp(thinking_observation=ThinkingObservation.OBSERVED))
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await mw(ChatRequest(messages=_MSGS), terminal)
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hit = await mw(ChatRequest(messages=_MSGS), terminal)
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assert hit.cache_hit is True and terminal.calls == 1
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assert isinstance(hit.thinking_observation, ThinkingObservation)
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assert hit.thinking_observation is ThinkingObservation.OBSERVED
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async def test_illegal_value_falls_back_to_source(self):
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"""污染值(旧版本写入或人为篡改)按未命中回源,不得复活出域外取值。"""
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backend = InMemoryCache()
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mw = _mw(backend)
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key = build_cache_key("m", _MSGS, "proj", None)
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poisoned = dataclasses.asdict(_resp(content="poisoned"))
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poisoned["thinking_observation"] = "bogus"
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poisoned.pop("structured_data", None)
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await backend.set(key, json.dumps(poisoned), 3600)
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terminal = _Terminal(_resp())
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resp = await mw(ChatRequest(messages=_MSGS), terminal)
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assert terminal.calls == 1 and resp.cache_hit is False
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assert resp.content == "cached" # 回源结果,不是被污染的那条
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async def test_legacy_entry_without_key_rehydrates_to_default(self):
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"""升级前写入的条目没有该键,必须照常复活并落到默认 UNKNOWN。"""
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backend = InMemoryCache()
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mw = _mw(backend)
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key = build_cache_key("m", _MSGS, "proj", None)
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legacy = dataclasses.asdict(_resp(content="legacy"))
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legacy.pop("thinking_observation")
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legacy.pop("structured_data", None)
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await backend.set(key, json.dumps(legacy), 3600)
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terminal = _Terminal(_resp())
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hit = await mw(ChatRequest(messages=_MSGS), terminal)
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assert hit.content == "legacy" and terminal.calls == 0
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assert hit.thinking_observation is ThinkingObservation.UNKNOWN
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class _BrokenBackend:
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async def get(self, key):
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raise ConnectionError("redis down")
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async def set(self, key, value, ttl_s):
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raise ConnectionError("redis down")
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class TestDegradation:
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async def test_backend_failure_degrades_silently(self):
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mw = _mw(_BrokenBackend())
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terminal = _Terminal(_resp())
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resp = await mw(ChatRequest(messages=_MSGS), terminal)
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assert resp.content == "cached" and terminal.calls == 1 # 读写全降级,调用照常
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async def test_corrupt_cache_value_treated_as_miss(self):
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backend = InMemoryCache()
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mw = _mw(backend)
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key = build_cache_key("m", _MSGS, "proj", None)
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await backend.set(key, "{not json", 3600)
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terminal = _Terminal(_resp())
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resp = await mw(ChatRequest(messages=_MSGS), terminal)
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assert terminal.calls == 1 and resp.cache_hit is False
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class _FakeStrategy:
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"""fake StructuredOutputStrategy(T2 冻结的 Protocol,不依赖 T11)。"""
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def request_overlay(self, schema):
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return {}
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def parse(self, text):
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data = json.loads(text) # 简化: 直接 json.loads
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if not isinstance(data, dict):
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raise ResultInvalidError("非对象", raw_text=text)
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return data
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class _StrictModel:
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"""鸭子型 pydantic 模型: model_validate 要求含 answer 键。"""
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@classmethod
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def model_validate(cls, data):
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if "answer" not in data:
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raise ValueError("missing answer")
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return {"validated": data["answer"]}
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class TestStructuredRehydration:
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async def test_hit_rebuilds_structured_data(self):
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backend = InMemoryCache()
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mw = _mw(backend, strategy=_FakeStrategy())
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terminal = _Terminal(_resp(content='{"answer": 42}'))
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req = ChatRequest(messages=_MSGS, structured=_StrictModel)
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await mw(req, terminal)
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hit = await mw(req, terminal)
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assert hit.cache_hit is True
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assert hit.structured_data == {"validated": 42}
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assert terminal.calls == 1
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async def test_schema_change_revalidation_failure_falls_back_to_source(self):
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backend = InMemoryCache()
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mw = _mw(backend, strategy=_FakeStrategy())
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terminal = _Terminal(_resp(content='{"other": 1}')) # 缓存内容不含 answer
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await mw(ChatRequest(messages=_MSGS), terminal) # 无 structured 写入
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# 换 schema 读: 重校验失败 → 按未命中回源
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again = await mw(ChatRequest(messages=_MSGS, structured=_StrictModel), terminal)
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assert terminal.calls == 2 and again.cache_hit is False
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async def test_structured_data_not_serialized_into_cache(self):
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backend = InMemoryCache()
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mw = _mw(backend, strategy=_FakeStrategy())
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terminal = _Terminal(
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dataclasses.replace(_resp(content='{"answer": 1}'), structured_data={"x": object()})
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)
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await mw(ChatRequest(messages=_MSGS), terminal) # 不可 JSON 的 structured_data 不阻塞写缓存
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key = build_cache_key("m", _MSGS, "proj", None)
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raw = await backend.get(key)
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assert raw is not None and "structured_data" not in json.loads(raw)
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class TestTelemetryCapDoesNotPoisonTheCacheKey:
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"""红线之一(issue #12): 遥测截断绝不能改到缓存 key。
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`digest_messages` 对 content 非 list 的消息**原样透传同一个 dict 对象**
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(本文件上方公式测试依赖的也是这份对象),遥测拿到的与算 key 用的是同一份。
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就地截断会让同一组 messages 在遥测前后算出两个不同的 key——全量 miss、
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且没有任何报错。故这里测的是"截断没有就地改掉调用方的对象",不只是
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"截断函数是纯的"。
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"""
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class _Rows:
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def __init__(self):
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self.rows = []
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async def record_llm_call(self, **fields):
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self.rows.append(fields)
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async def test_key_is_byte_identical_across_a_capped_emit(self):
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messages = [
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{"role": "user", "content": "合同正文" * 31},
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{"role": "user", "content": [{"type": "text", "text": "标书正文" * 30}]},
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]
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before = build_cache_key("m", messages, "proj", None)
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rec = self._Rows()
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await TelemetryEmitter(rec, text_cap=8).emit_attempt(
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request=ChatRequest(messages=messages),
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source=SourceConfig(
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name="s1",
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provider="p",
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base_url="https://gw.example/v1",
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api_key="sk",
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model="m",
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timeout_s=10.0,
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),
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call_id="c",
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latency_ms=1,
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response=_resp(),
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error=None,
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)
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# 截断确实发生了(否则本用例恒真)
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logged = json.loads(rec.rows[0]["messages"])
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assert "(略 116 字)" in logged[0]["content"]
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assert "(略 112 字)" in logged[1]["content"][0]["text"]
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assert build_cache_key("m", messages, "proj", None) == before
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