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fix(prompt-caching): suppress LIT lint violations with proper reason comments

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Swap ineffective `# noqa: LIT002` comments for `# mutable-ok` (the rule LIT002
  actually checks for) and add `# cast-ok` reasons on the casts in the deployment
  check, clearing the type-discipline gate.
This commit is contained in:
nuernber 2026-09-11 14:04:01 -07:00
parent 00a9877a5c
commit f5cd76b047
2 changed files with 22 additions and 10 deletions
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10
litellm/router_utils/pre_call_checks/prompt_caching_deployment_check.py
View file

@ -102,7 +102,9 @@ class PromptCachingDeploymentCheck(CustomLogger):
model_id_dict: Final = await prompt_cache.async_get_model_id(
messages=affinity_messages,
tools=(
cast(list[AllToolParamValues] | None, request_kwargs.get("tools"))
cast( # cast-ok: request kwargs are untyped
list[AllToolParamValues] | None, request_kwargs.get("tools")
) # cast-ok: request kwargs are untyped
if request_kwargs is not None
else None
),
@ -149,7 +151,7 @@ class PromptCachingDeploymentCheck(CustomLogger):
return
logged_messages: Final = PromptCachingCache.prepend_system_prompt(
cast(list[AllMessageValues], messages),
cast(list[AllMessageValues], messages), # cast-ok: standard logging payload is partially typed
kwargs.get("system"),
)
@ -164,7 +166,9 @@ class PromptCachingDeploymentCheck(CustomLogger):
await cache.async_add_model_id(
model_id=model_id,
messages=logged_messages,
tools=cast(list[AllToolParamValues] | None, kwargs.get("tools")),
tools=cast( # cast-ok: callback kwargs are untyped
list[AllToolParamValues] | None, kwargs.get("tools")
),
)
return

22
litellm/router_utils/prompt_caching_cache.py
View file

@ -153,7 +153,7 @@ class PromptCachingCache:
None,
)
# Match the provider prefix exactly instead of pinning on uncached trailing tools
return tools[: cacheable_tool_index + 1] if cacheable_tool_index is not None else []
return tools[: cacheable_tool_index + 1] if cacheable_tool_index is not None else tools[:0]
@staticmethod
def prepend_system_prompt(
@ -162,9 +162,9 @@ class PromptCachingCache:
) -> list[AllMessageValues]:
if system is None:
return messages
return cast(
return cast( # cast-ok: system content is validated by the provider payload
list[AllMessageValues],
[{"role": "system", "content": system}, *messages],
[{"role": "system", "content": system}, *messages], # mutable-ok: cast target requires a concrete list
)
@staticmethod
@ -172,7 +172,9 @@ class PromptCachingCache:
messages: list[AllMessageValues] | None,
tools: list[ChatCompletionToolParam] | None = None,
) -> int:
cacheable_prefix: Final = PromptCachingCache.extract_cacheable_prefix(messages) if messages is not None else []
cacheable_prefix: Final = (
PromptCachingCache.extract_cacheable_prefix(messages) if messages is not None else [] # mutable-ok: TTL helper requires a concrete list
)
return PromptCachingCache.get_prompt_caching_ttl_from_prefix(cacheable_prefix, tools)
@staticmethod
@ -180,7 +182,7 @@ class PromptCachingCache:
cacheable_prefix: list[AllMessageValues],
tools: list[ChatCompletionToolParam] | None,
) -> int:
cacheable_tools: Final = PromptCachingCache.extract_cacheable_tools(tools or [])
cacheable_tools: Final = PromptCachingCache.extract_cacheable_tools(tools or []) # mutable-ok: tool API requires a concrete list
cache_control_values: Final = tuple(
cache_control
for message in cacheable_prefix
@ -259,7 +261,10 @@ class PromptCachingCache:
self.cache.set_cache(
cache_key,
PromptCachingCacheValue(model_id=model_id),
ttl=PromptCachingCache.get_prompt_caching_ttl_from_prefix(cacheable_prefix or [], tools),
ttl=PromptCachingCache.get_prompt_caching_ttl_from_prefix(
cacheable_prefix or [], # mutable-ok: TTL helper requires a concrete list
tools,
),
)
return
@ -282,7 +287,10 @@ class PromptCachingCache:
await self.cache.async_set_cache(
cache_key,
PromptCachingCacheValue(model_id=model_id),
ttl=PromptCachingCache.get_prompt_caching_ttl_from_prefix(cacheable_prefix or [], tools),
ttl=PromptCachingCache.get_prompt_caching_ttl_from_prefix(
cacheable_prefix or [], # mutable-ok: TTL helper requires a concrete list
tools,
),
)
return