From 30ed0c14b56f69113ef25909d5479854cde3769a Mon Sep 17 00:00:00 2001
From: KnyazSh <yuriy.shuyskiy@gmail.com>
Date: Wed, 8 Jul 2026 06:36:55 +0000
Subject: [PATCH] fix(lint) : resolve LIT006 violations

---
 .../gigachat/passthrough/transformation.py    |  5 ++--
 litellm/passthrough/main.py                   | 27 ++++++++++++++++---
 .../llm_passthrough_endpoints.py              |  8 +++++-
 3 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/litellm/llms/gigachat/passthrough/transformation.py b/litellm/llms/gigachat/passthrough/transformation.py
index 7f37fb91bf6..605037020e3 100644
--- a/litellm/llms/gigachat/passthrough/transformation.py
+++ b/litellm/llms/gigachat/passthrough/transformation.py
@@ -178,10 +178,9 @@ class GigaChatPassthroughConfig(BasePassthroughConfig):
             )
             translated_chunk = gigachat_iterator.chunk_parser(chunk=message)
 
-            if isinstance(translated_chunk, dict) and generic_chunk_has_all_required_fields(
-                cast(dict, translated_chunk)
-            ):
+            if isinstance(translated_chunk, dict) and generic_chunk_has_all_required_fields(translated_chunk):
                 chunk_obj = convert_generic_chunk_to_model_response_stream(
+                    # cast-ok: validated TypedDict
                     cast(GenericStreamingChunk, translated_chunk)
                 )
             elif isinstance(translated_chunk, ModelResponseStream):
diff --git a/litellm/passthrough/main.py b/litellm/passthrough/main.py
index 829aa769491..b3cfb4b61c6 100644
--- a/litellm/passthrough/main.py
+++ b/litellm/passthrough/main.py
@@ -10,8 +10,10 @@ from functools import partial
 from typing import (
     Any,
     AsyncGenerator,
+    AsyncIterator,
     Coroutine,
     Generator,
+    Iterator,
     List,
     cast,
 )
@@ -32,6 +34,16 @@ base_llm_http_handler = BaseLLMHTTPHandler()
 from .utils import BasePassthroughUtils
 
 
+async def _as_async_generator(iterable: AsyncIterator[bytes]) -> AsyncGenerator[bytes, Any]:
+    async for chunk in iterable:
+        yield chunk
+
+
+def _as_generator(iterable: Iterator[bytes]) -> Generator[bytes, Any, Any]:
+    for chunk in iterable:
+        yield chunk
+
+
 class AsyncPassthroughStreamingResponse(AsyncGenerator[Any, Any]):
     def __init__(
         self,
@@ -80,7 +92,7 @@ class AsyncPassthroughStreamingResponse(AsyncGenerator[Any, Any]):
                 self._initialized = True
                 try:
                     self._response.raise_for_status()
-                    self._iterator = cast(AsyncGenerator[bytes, Any], self._response.aiter_bytes())
+                    self._iterator = _as_async_generator(self._response.aiter_bytes())
                 except Exception:  # noqa: BLE001
                     try:
                         await self._response.aclose()
@@ -123,7 +135,7 @@ class AsyncPassthroughStreamingResponse(AsyncGenerator[Any, Any]):
         if not self._initialized:
             await self
         try:
-            chunk = await self._iterator.__anext__()
+            chunk = await anext(self._iterator)
             self._raw_bytes.append(chunk)
             return chunk
         except Exception:  # noqa: BLE001
@@ -148,6 +160,7 @@ class AsyncPassthroughStreamingResponse(AsyncGenerator[Any, Any]):
         self._start_flush()
         try:
             if self._initialized:
+                await self._iterator.aclose()
                 await self._response.aclose()
         except Exception:  # noqa: BLE001
             pass
@@ -165,7 +178,7 @@ class PassthroughStreamingResponse(Generator[Any, Any, Any]):
         self.status_code = response.status_code
         self._litellm_logging_obj = litellm_logging_obj
         self._provider_config = provider_config
-        self._iterator: Generator[bytes, Any, Any] = cast(Generator[bytes, Any, Any], response.iter_bytes())
+        self._iterator: Generator[bytes, Any, Any] = _as_generator(response.iter_bytes())
         self._raw_bytes: List[bytes] = []
         self._flush_scheduled = False
 
@@ -383,7 +396,13 @@ def llm_passthrough_route(
 
     _is_async = bool(kwargs.get("allm_passthrough_route", False))
 
-    litellm_logging_obj = cast(LiteLLMLoggingObj, kwargs.get("litellm_logging_obj"))
+    _raw_logging_obj = kwargs.get("litellm_logging_obj")
+    if not isinstance(_raw_logging_obj, LiteLLMLoggingObj):
+        raise TypeError(
+            "litellm_logging_obj is required and must be a LiteLLMLoggingObj instance; "
+            f"got {type(_raw_logging_obj).__name__}"
+        )
+    litellm_logging_obj: LiteLLMLoggingObj = _raw_logging_obj
 
     model, custom_llm_provider, api_key, api_base = get_llm_provider(
         model=model,
diff --git a/litellm/proxy/pass_through_endpoints/llm_passthrough_endpoints.py b/litellm/proxy/pass_through_endpoints/llm_passthrough_endpoints.py
index ad3f22af7a1..dca24203105 100644
--- a/litellm/proxy/pass_through_endpoints/llm_passthrough_endpoints.py
+++ b/litellm/proxy/pass_through_endpoints/llm_passthrough_endpoints.py
@@ -455,7 +455,13 @@ async def milvus_proxy_route(
     request_body = await get_request_body(request)
 
     # check collectionName
-    collection_name = cast(str | None, request_body.get("collectionName"))
+    _raw_collection_name = request_body.get("collectionName")
+    if _raw_collection_name is not None and not isinstance(_raw_collection_name, str):
+        raise HTTPException(
+            status_code=400,
+            detail=f"collectionName must be a string. Got {type(_raw_collection_name).__name__}",
+        )
+    collection_name: str | None = _raw_collection_name
     extra_headers = {}
     base_target_url: str | None = None
     if not collection_name: