litellm/tests/unit/test_router
devin-ai-integration[bot] e136e91273
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fix(router): keep the prompt caching affinity pin alive as long as the prefix's cache_control ttl (#46084)
* fix(router): keep the prompt caching affinity pin alive as long as the prefix's cache_control ttl

A prefix marked cache_control ttl 1h lost its pinned deployment after the fixed 300 s, so the next request went to another deployment and paid a cold cache. The pin TTL now follows the longest ephemeral breakpoint in the cacheable prefix, tools included: 3600 s for a 1h breakpoint and 300 s otherwise.

* fix(router): give prompt cache pins their own tier and honour any declared ttl

Pins now live in a DualCache of their own instead of the router's 200-slot
in-memory tier, so an hour-long pin no longer evicts cooldowns and rate windows.
The pin lifetime follows any <n>s|m|h cache_control ttl, floored at 300 s, not
only the literal "1h".

* fix(router): hash the pin ttl off the event loop and flush prompt cache pins with the router cache

Compute the cache_control ttl scan through offload_token_count beside the
prefix hash, clear the dedicated pin cache in Router.flush_cache, and point
the order-fallback and priority-group pin tests at the pin cache they read

* fix(router): pin 1h prefixes only on 1h-capable models, cap the pin at 1h, and give pins 10k in-memory slots

* fix(router): match the 1h pin gate to what Bedrock forwards

Bedrock deployments now decide the 1h pin with is_claude_4_5_on_bedrock,
the same check that decides whether the 1h ttl reaches Bedrock, so an
application inference profile ARN keeps a 5 minute pin whatever its
base_model prices

* test(router): give the anthropic_messages pin fixture its provider

* fix(router): let each pin write set its own lifetime and require a positive 1h price

In a group mixing 1h and 5m deployments the in-memory pin kept the lifetime of its first write, so a 5m deployment could hold an hour-long pin. Each write now clears the in-memory entry first, matching Redis. The Bedrock gate uses supports_bedrock_prompt_cache_ttl after #46058, and a zero 1h price no longer counts as 1h support.

* test(router): integration cells for the one-hour prompt cache pin lifetime

Cover every surface the pin lifetime touches: chat and /v1/messages through
both SDKs, the responses bridge, response-cache hits, each provider family's
1h gate, malformed and duplicated ttl values, rewrites of one prefix, mixed
and cross-group routing, concurrency, every Redis attach path, the in-memory
slot pressure without Redis reads, a Redis outage and a killed worker

* fix(caching): bound the in-memory expiry heap and count prompt cache pins in the memory debug routes

* test(integration): cover prompt cache pins in the memory debug routes and the bounded expiration heap

* fix(caching): serialize in-memory cache writes so a heap rebuild cannot lose another thread's expiry entry

* fix(caching): keep the in-memory cache bounded when entries have no usable expiry

* test(caching): cover the response cache bound when cached entries have no usable ttl

---------

Co-authored-by: mateo-berri <277851410+mateo-berri@users.noreply.github.com>
2026-10-14 21:10:09 -07:00
..
__init__.py test: add __init__.py to every tests/unit directory phase 16 touches 2026-09-20 11:52:38 +00:00
test_enforce_model_rate_limits.py test: migrate phase 16 legacy tests to tests/unit 2026-09-20 10:59:02 +00:00
test_io_token_rate_limits.py test: migrate phase 16 legacy tests to tests/unit 2026-09-20 10:59:02 +00:00
test_router.py fix(router): keep the prompt caching affinity pin alive as long as the prefix's cache_control ttl (#46084) 2026-10-14 21:10:09 -07:00
test_router_callback_hook_sequence.py test: replace 61 live logging and otel tests with offline unit and integration coverage (#45362) 2026-10-08 15:55:57 -07:00
test_router_endpoints.py test: move the unit half of 126 mixed legacy files into tests/unit (#45090) 2026-10-07 14:07:43 -07:00
test_router_fallbacks.py test: move routing, caching and callback tests out of local_testing (#45761) 2026-10-10 09:33:09 -07:00
test_router_get_deployments.py test: move routing, caching and callback tests out of local_testing (#45761) 2026-10-10 09:33:09 -07:00
test_router_helper_utils.py feat(dashscope): add Wan 3.0, Wan 2.7 and HappyHorse video generation via /v1/videos (#43706) 2026-10-14 10:10:07 -07:00
test_router_max_parallel_requests.py test: move routing, caching and callback tests out of local_testing (#45761) 2026-10-10 09:33:09 -07:00
test_router_provider_endpoints.py test: make 77 legacy live tests offline in litellm_utils, router_unit and responses dirs (#45298) 2026-10-08 02:37:55 -07:00
test_router_retries.py test: move routing, caching and callback tests out of local_testing (#45761) 2026-10-10 09:33:09 -07:00
test_router_timeout.py test: move routing, caching and callback tests out of local_testing (#45761) 2026-10-10 09:33:09 -07:00
test_router_vector_store_endpoints.py test: migrate SDK and proxy-booting legacy CircleCI tests to their tiers (#45758) 2026-10-11 00:17:21 -07:00