e2bd400233
An HTTPError means the host answered — a 401 from a wrong API key must not be remembered as "unreachable" for the next 60s, or a user who fixes the key gets a cached empty catalog on the immediate re-probe. Connection-level failures (timeouts, refused, DNS) are the only thing the cache records. _probe_neg_key hand-rolled scheme/port defaulting that utils.base_url_origin already provides; use it.
453 lines
22 KiB
Python
453 lines
22 KiB
Python
"""Cache-contract tests for ``cached_fetch_api_models()``.
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Custom OpenAI-compatible endpoints (named ``custom_providers`` rows, bare
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``provider: custom``, and per-endpoint-map entries) previously called
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``fetch_api_models()`` directly with no disk cache, so the current custom
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endpoint's ``/v1/models`` got a live HTTP round-trip on literally every
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``/model`` open (#72762). ``cached_fetch_api_models()`` gives custom
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endpoints the same ``provider_models_cache.json`` TTL cache first-class
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providers already get via ``cached_provider_model_ids()``.
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These pin the cache contract directly (hit / stale / rotation / refresh /
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fallback), separate from ``test_model_switch_custom_providers.py``'s
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higher-level picker-shape tests.
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"""
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from __future__ import annotations
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import time
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from unittest.mock import patch
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import pytest
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class TestCachedFetchApiModels:
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def _entry(self, models, age_seconds, fp="fp"):
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return {"fp": fp, "at": time.time() - age_seconds, "models": list(models)}
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def test_fresh_entry_served_without_live_fetch(self):
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import hermes_cli.models as mod
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["m1", "m2"], age_seconds=10)}
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
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patch.object(mod, "_save_provider_models_cache") as save, \
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patch.object(mod, "fetch_api_models") as live:
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out = mod.cached_fetch_api_models("sk-key", "https://gw.example.com/v1")
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assert out == ["m1", "m2"]
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live.assert_not_called()
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save.assert_not_called()
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def test_cache_key_normalizes_trailing_slash_and_case(self):
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"""A saved entry for the lowercased/rstripped URL must be hit even
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when the caller passes a differently-cased URL with a trailing
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slash — config.yaml entries are not guaranteed to be normalized."""
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import hermes_cli.models as mod
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["m1"], age_seconds=10)}
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
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patch.object(mod, "fetch_api_models") as live:
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out = mod.cached_fetch_api_models("sk-key", "HTTPS://GW.example.com/v1/")
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assert out == ["m1"]
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live.assert_not_called()
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def test_expired_entry_triggers_live_fetch_and_is_persisted(self):
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import hermes_cli.models as mod
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# Beyond the stale-serve window, so the wrapper must block on a
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# live fetch (within the window it stale-serves + refreshes off
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# thread — covered in TestSalvageFollowups).
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too_old = mod._PROVIDER_MODELS_STALE_SERVE_MAX + 60
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["old"], age_seconds=too_old)}
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saved = {}
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
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patch.object(mod, "_save_provider_models_cache", side_effect=saved.update), \
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patch.object(mod, "fetch_api_models", return_value=["fresh-a", "fresh-b"]) as live:
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out = mod.cached_fetch_api_models(
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"sk-key", "https://gw.example.com/v1", ttl_seconds=3600
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)
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assert out == ["fresh-a", "fresh-b"]
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live.assert_called_once()
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assert saved["custom:https://gw.example.com/v1#fp"]["models"] == ["fresh-a", "fresh-b"]
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assert saved["custom:https://gw.example.com/v1#fp"]["fp"] == "fp"
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def test_rotated_api_key_busts_cache_even_when_fresh(self):
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"""A same-age entry with a DIFFERENT fingerprint (key rotated, or
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extra_headers edited) must not be served — it reflects the old
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credentials' catalog."""
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import hermes_cli.models as mod
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cache = {"custom:https://gw.example.com/v1#old-fp": self._entry(["old-key-models"], 10, fp="old-fp")}
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="new-fp"), \
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patch.object(mod, "_save_provider_models_cache"), \
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patch.object(mod, "fetch_api_models", return_value=["new-key-models"]) as live:
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out = mod.cached_fetch_api_models("sk-new-key", "https://gw.example.com/v1")
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assert out == ["new-key-models"]
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live.assert_called_once()
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def test_force_refresh_bypasses_fresh_cache(self):
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import hermes_cli.models as mod
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["stale-but-fresh"], age_seconds=5)}
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
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patch.object(mod, "_save_provider_models_cache"), \
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patch.object(mod, "fetch_api_models", return_value=["forced-live"]) as live:
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out = mod.cached_fetch_api_models(
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"sk-key", "https://gw.example.com/v1", force_refresh=True
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)
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assert out == ["forced-live"]
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live.assert_called_once()
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def test_live_failure_falls_back_to_stale_same_fingerprint_entry(self):
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"""Stale data beats no data when the endpoint is flaky (#72762
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proposed-fix: 'same stale-beats-nothing fallback as
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cached_provider_model_ids')."""
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import hermes_cli.models as mod
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["last-known-good"], age_seconds=99999, fp="fp")}
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
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patch.object(mod, "_save_provider_models_cache") as save, \
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patch.object(mod, "fetch_api_models", return_value=None):
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out = mod.cached_fetch_api_models("sk-key", "https://gw.example.com/v1")
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assert out == ["last-known-good"]
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save.assert_not_called() # nothing new to persist
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def test_live_failure_with_no_matching_entry_returns_live_value(self):
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import hermes_cli.models as mod
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with patch.object(mod, "_load_provider_models_cache", return_value={}), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
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patch.object(mod, "_save_provider_models_cache") as save, \
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patch.object(mod, "fetch_api_models", return_value=None):
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out = mod.cached_fetch_api_models("sk-key", "https://gw.example.com/v1")
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assert out is None
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save.assert_not_called()
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class TestCacheOnly:
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"""``cache_only=True`` is the non-blocking read used by picker opens that
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deliberately skip live probing. The caller's thread never fetches; a
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past-TTL entry is served AND revalidated off-thread so a newly loaded local
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model appears on a later open instead of hiding for the whole stale window."""
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def _entry(self, models, age_seconds, fp="fp"):
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return {"fp": fp, "at": time.time() - age_seconds, "models": list(models)}
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def _call(self, cache, *, fp="fp", expect_revalidate=False, **kwargs):
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import hermes_cli.models as mod
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value=fp), \
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patch.object(mod, "_save_provider_models_cache") as save, \
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patch.object(mod, "_spawn_swr_refresh") as swr, \
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patch.object(mod, "fetch_api_models") as live:
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out = mod.cached_fetch_api_models(
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"sk-key", "https://gw.example.com/v1", cache_only=True, **kwargs
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)
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live.assert_not_called() # the caller's thread never blocks on the network
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save.assert_not_called()
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assert swr.called == expect_revalidate
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return out
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def test_fresh_entry_is_served(self):
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["m1", "m2"], 10)}
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assert self._call(cache) == ["m1", "m2"]
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def test_entry_past_ttl_is_still_served_within_the_stale_window(self):
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"""The TTL governs when to *revalidate*, and cache_only cannot. Inside
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the stale-serve bound the entry is still the best answer available —
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collapsing to the config subset an hour in would reintroduce the bug."""
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import hermes_cli.models as mod
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age = mod._PROVIDER_MODELS_CACHE_TTL + 60
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["m1", "m2"], age)}
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assert self._call(cache, expect_revalidate=True) == ["m1", "m2"]
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def test_entry_beyond_the_stale_window_is_a_miss(self):
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import hermes_cli.models as mod
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age = mod._PROVIDER_MODELS_STALE_SERVE_MAX + 60
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["ancient"], age)}
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assert self._call(cache) is None
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def test_empty_cache_is_a_miss(self):
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assert self._call({}) is None
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def test_rotated_credentials_are_a_miss(self):
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cache = {"custom:https://gw.example.com/v1#old-fp": self._entry(["old"], 10, fp="old-fp")}
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assert self._call(cache, fp="new-fp") is None
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def test_force_refresh_is_a_miss_rather_than_a_live_fetch(self):
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"""cache_only outranks force_refresh: the caller has said no network,
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so an un-revalidatable entry is withheld instead of fetched."""
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["m1"], 10)}
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assert self._call(cache, force_refresh=True) is None
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def test_missing_base_url_is_a_miss_rather_than_a_live_fetch(self):
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import hermes_cli.models as mod
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with patch.object(mod, "fetch_api_models") as live:
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out = mod.cached_fetch_api_models("sk-key", "", cache_only=True)
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assert out is None
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live.assert_not_called()
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def test_empty_live_result_is_not_persisted(self):
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"""An empty list from a transient error must never pin an empty
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cache entry over real data on the next open."""
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import hermes_cli.models as mod
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with patch.object(mod, "_load_provider_models_cache", return_value={}), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
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patch.object(mod, "_save_provider_models_cache") as save, \
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patch.object(mod, "fetch_api_models", return_value=[]):
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out = mod.cached_fetch_api_models("sk-key", "https://gw.example.com/v1")
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assert out == []
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save.assert_not_called()
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def test_blank_base_url_skips_cache_entirely(self):
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"""No base_url means nothing to key the cache on — call straight
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through to fetch_api_models rather than caching under an empty key."""
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import hermes_cli.models as mod
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with patch.object(mod, "_load_provider_models_cache") as load, \
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patch.object(mod, "fetch_api_models", return_value=["x"]) as live:
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out = mod.cached_fetch_api_models("sk-key", "")
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assert out == ["x"]
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live.assert_called_once()
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load.assert_not_called()
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def test_fingerprint_ignores_timeout_but_reacts_to_headers(self):
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"""Sanity check on the real (non-mocked) fingerprint helper: it must
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not vary with call-only params like timeout, but must vary with the
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actual credential/header inputs."""
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import hermes_cli.models as mod
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fp_a = mod._custom_endpoint_fingerprint("sk-key", None, {"X-Tenant": "a"})
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fp_b = mod._custom_endpoint_fingerprint("sk-key", None, {"X-Tenant": "b"})
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fp_a_again = mod._custom_endpoint_fingerprint("sk-key", None, {"X-Tenant": "a"})
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assert fp_a != fp_b
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assert fp_a == fp_a_again
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class TestCachedFetchApiModelsDiskRoundTrip:
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"""End-to-end through the real (per-test-isolated) provider_models_cache.json
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disk file rather than mocked load/save, so a regression in the on-disk
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schema (e.g. a key collision with provider-slug entries) would show up
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here even if the mocked unit tests above stayed green."""
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def test_second_call_within_ttl_hits_disk_cache_no_live_fetch(self, monkeypatch):
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import hermes_cli.models as mod
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calls = []
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def fake_fetch(api_key, base_url, **kwargs):
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calls.append((api_key, base_url))
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return ["disk-cached-model"]
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monkeypatch.setattr(mod, "fetch_api_models", fake_fetch)
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first = mod.cached_fetch_api_models("sk-key", "https://gw.example.com/v1")
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second = mod.cached_fetch_api_models("sk-key", "https://gw.example.com/v1")
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assert first == ["disk-cached-model"]
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assert second == ["disk-cached-model"]
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assert len(calls) == 1, "second open must be served from disk, not a fresh live fetch"
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def test_custom_key_does_not_collide_with_provider_slug_cache(self, monkeypatch):
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"""A custom endpoint literally named e.g. 'openrouter' in its
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base_url must not read/write the same cache slot as the first-class
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'openrouter' provider slug used by cached_provider_model_ids()."""
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import hermes_cli.models as mod
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monkeypatch.setattr(
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mod, "fetch_api_models", lambda *a, **k: ["custom-endpoint-model"]
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)
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monkeypatch.setattr(
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mod, "provider_model_ids", lambda *a, **k: ["openrouter-curated-model"]
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)
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mod.cached_fetch_api_models("sk-key", "https://openrouter.ai/v1")
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mod.cached_provider_model_ids("openrouter")
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cache = mod._load_provider_models_cache()
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custom_rows = [v for k, v in cache.items() if k.startswith("custom:https://openrouter.ai/v1#")]
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assert [row["models"] for row in custom_rows] == [["custom-endpoint-model"]]
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assert cache["openrouter"]["models"] == ["openrouter-curated-model"]
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def test_same_url_distinct_credentials_keep_separate_rows(self, tmp_path, monkeypatch):
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"""N custom_providers rows sharing one proxy URL with different keys (#106184): a probe
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for key B must not evict key A's catalog, and a cache-only read for A must still hit."""
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import hermes_cli.models as mod
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monkeypatch.setenv("HERMES_HOME", str(tmp_path))
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monkeypatch.setattr(mod, "fetch_api_models", lambda key, *a, **k: [f"models-for-{key}"])
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url = "https://proxy.example.com/v1"
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assert mod.cached_fetch_api_models("sk-A", url) == ["models-for-sk-A"]
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assert mod.cached_fetch_api_models("sk-B", url) == ["models-for-sk-B"]
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monkeypatch.setattr(mod, "fetch_api_models", lambda *a, **k: pytest.fail("cache miss"))
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assert mod.cached_fetch_api_models("sk-A", url, cache_only=True) == ["models-for-sk-A"]
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assert mod.cached_fetch_api_models("sk-B", url, cache_only=True) == ["models-for-sk-B"]
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class TestSalvageFollowups:
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"""Follow-up behaviors added while salvaging PR #80740: SWR stale-serve
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parity with cached_provider_model_ids, and corrupt-cache degradation."""
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def _entry(self, models, age_seconds, fp="fp"):
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return {"fp": fp, "at": time.time() - age_seconds, "models": list(models)}
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def test_expired_entry_within_stale_window_is_served_and_refreshed_off_thread(self):
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"""TTL-expired (but < stale-serve max) entries must be served
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immediately — the picker never blocks on a live round-trip — while a
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background refresh is spawned for the next open."""
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import hermes_cli.models as mod
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["stale-ok"], age_seconds=7200)}
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
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patch.object(mod, "_spawn_swr_refresh") as spawn, \
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patch.object(mod, "fetch_api_models") as live:
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out = mod.cached_fetch_api_models(
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"sk-key", "https://gw.example.com/v1", ttl_seconds=3600
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)
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assert out == ["stale-ok"]
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live.assert_not_called()
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spawn.assert_called_once()
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assert spawn.call_args[0][0] == "custom:https://gw.example.com/v1#fp"
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def test_entry_beyond_stale_window_blocks_on_live_fetch(self):
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import hermes_cli.models as mod
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too_old = mod._PROVIDER_MODELS_STALE_SERVE_MAX + 60
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cache = {"custom:https://gw.example.com/v1#fp": self._entry(["ancient"], age_seconds=too_old)}
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
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patch.object(mod, "_save_provider_models_cache"), \
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patch.object(mod, "_spawn_swr_refresh") as spawn, \
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patch.object(mod, "fetch_api_models", return_value=["fresh"]) as live:
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out = mod.cached_fetch_api_models("sk-key", "https://gw.example.com/v1")
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assert out == ["fresh"]
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live.assert_called_once()
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spawn.assert_not_called()
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def test_swr_refresh_fn_writes_custom_entry_through_shared_scaffolding(self):
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"""The generalized _spawn_swr_refresh(key, refresh_fn) must persist a
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custom-endpoint entry via the shared inflight-dedupe machinery."""
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import threading as _threading
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import hermes_cli.models as mod
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done = _threading.Event()
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saved = {}
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def fake_save(data):
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saved.update(data)
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done.set()
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with patch.object(mod, "_load_provider_models_cache", return_value={}), \
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patch.object(mod, "_save_provider_models_cache", side_effect=fake_save):
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mod._spawn_swr_refresh(
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"custom:https://gw.example.com/v1#fp",
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lambda: {"fp": "fp", "at": time.time(), "models": ["refreshed"]},
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)
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assert done.wait(timeout=5), "background refresh did not complete"
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assert saved["custom:https://gw.example.com/v1#fp"]["models"] == ["refreshed"]
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assert "custom:https://gw.example.com/v1#fp" not in mod._swr_refresh_inflight
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def test_corrupt_at_field_degrades_to_live_fetch_instead_of_raising(self):
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"""provider_models_cache.json is user-editable; a corrupted 'at' must
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be a cache miss (live fetch), never an exception out of the wrapper."""
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import hermes_cli.models as mod
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cache = {
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"custom:https://gw.example.com/v1#fp": {
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"fp": "fp", "at": "yesterday", "models": ["corrupt-row"],
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}
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}
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with patch.object(mod, "_load_provider_models_cache", return_value=cache), \
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patch.object(mod, "_custom_endpoint_fingerprint", return_value="fp"), \
|
|
patch.object(mod, "_save_provider_models_cache"), \
|
|
patch.object(mod, "fetch_api_models", return_value=["live-models"]) as live:
|
|
out = mod.cached_fetch_api_models("sk-key", "https://gw.example.com/v1")
|
|
assert out == ["live-models"]
|
|
live.assert_called_once()
|
|
|
|
|
|
class TestProbeApiModelsNegativeCache:
|
|
"""#81123: a fully-failed /models probe must degrade fast, not re-burn
|
|
connect timeouts per URL candidate on every picker open."""
|
|
|
|
@pytest.fixture(autouse=True)
|
|
def _clear_probe_neg_cache(self):
|
|
import hermes_cli.models as mod
|
|
|
|
mod._probe_neg_cache.clear()
|
|
yield
|
|
mod._probe_neg_cache.clear()
|
|
|
|
def _fail(self, req, **kw):
|
|
raise TimeoutError("connect timed out")
|
|
|
|
def test_repeat_failure_within_ttl_skips_network(self, monkeypatch):
|
|
import hermes_cli.models as mod
|
|
|
|
monkeypatch.setattr(mod, "_urlopen_model_catalog_request", self._fail)
|
|
r1 = mod.probe_api_models("", "https://blackhole.invalid/v1", timeout=1.0)
|
|
calls = []
|
|
monkeypatch.setattr(
|
|
mod, "_urlopen_model_catalog_request",
|
|
lambda req, **kw: calls.append(req.full_url) or self._fail(req, **kw),
|
|
)
|
|
r2 = mod.probe_api_models("", "https://blackhole.invalid/v1/", timeout=1.0)
|
|
assert (r1["models"], r2["models"]) == (None, None)
|
|
assert calls == [] # /v1 + root share one host:port entry
|
|
assert r2["probed_url"] == "https://blackhole.invalid/v1/models"
|
|
|
|
def test_http_error_from_a_reachable_host_is_not_cached_as_unreachable(self, monkeypatch):
|
|
import urllib.error
|
|
|
|
import hermes_cli.models as mod
|
|
|
|
def _unauthorized(req, **kw):
|
|
raise urllib.error.HTTPError(req.full_url, 401, "Unauthorized", {}, None)
|
|
|
|
monkeypatch.setattr(mod, "_urlopen_model_catalog_request", _unauthorized)
|
|
assert mod.probe_api_models("bad-key", "https://reachable.invalid/v1", timeout=1.0)["models"] is None
|
|
# The host answered; a corrected key must probe again immediately.
|
|
assert "reachable.invalid:443" not in mod._probe_neg_cache
|
|
|
|
def test_expired_entry_reprobes_and_success_clears_it(self, monkeypatch):
|
|
import hermes_cli.models as mod
|
|
|
|
key = "blackhole.invalid:443"
|
|
old = time.monotonic() - mod._PROBE_NEG_TTL - 1
|
|
mod._probe_neg_cache[key] = old
|
|
monkeypatch.setattr(mod, "_urlopen_model_catalog_request", self._fail)
|
|
out = mod.probe_api_models("", "https://blackhole.invalid/v1", timeout=1.0)
|
|
assert out["models"] is None
|
|
assert mod._probe_neg_cache[key] > old # expiry re-probed and re-recorded
|
|
|
|
mod._probe_neg_cache[key] = old # expired again: the real probe runs
|
|
|
|
class _Resp:
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, *a):
|
|
return False
|
|
|
|
def read(self):
|
|
return b'{"data": [{"id": "m1"}]}'
|
|
|
|
monkeypatch.setattr(mod, "_urlopen_model_catalog_request", lambda req, **kw: _Resp())
|
|
ok = mod.probe_api_models("", "https://blackhole.invalid/v1", timeout=1.0)
|
|
assert ok["models"] == ["m1"]
|
|
assert key not in mod._probe_neg_cache # recovery is not masked by the stale entry
|