perf: use frozenset for enum membership checks to avoid O(n) iteration

Replace O(n) list/enum iteration with O(1) frozenset lookups:
- route_checks.py: frozenset for LiteLLMRoutes._member_names_
- types/utils.py: cache DynamicPromptManagementParamLiteral.list_all_params()
- utils.py: use existing LlmProvidersSet instead of _member_map_.values()

litellm/proxy/auth/route_checks.py

@@ -12,6 +12,8 @@ from litellm.proxy._types import (
     UserAPIKeyAuth,
 )
 
+_LITELLM_ROUTES_MEMBER_NAMES: frozenset = frozenset(LiteLLMRoutes._member_names_)
+
 from .auth_checks_organization import _user_is_org_admin
 
 
@@ -61,11 +63,11 @@ class RouteChecks:
 
         ## check if 'allowed_route' is a field name in LiteLLMRoutes
         if any(
-            allowed_route in LiteLLMRoutes._member_names_
+            allowed_route in _LITELLM_ROUTES_MEMBER_NAMES
             for allowed_route in valid_token.allowed_routes
         ):
             for allowed_route in valid_token.allowed_routes:
-                if allowed_route in LiteLLMRoutes._member_names_:
+                if allowed_route in _LITELLM_ROUTES_MEMBER_NAMES:
                     if RouteChecks.check_route_access(
                         route=route,
                         allowed_routes=LiteLLMRoutes._member_map_[allowed_route].value,

litellm/types/utils.py

@@ -3430,7 +3430,12 @@ class DynamicPromptManagementParamLiteral(str, Enum):
 
     @classmethod
     def list_all_params(cls):
-        return [param.value for param in cls]
+        return _DYNAMIC_PROMPT_MANAGEMENT_PARAMS
+
+
+_DYNAMIC_PROMPT_MANAGEMENT_PARAMS: frozenset = frozenset(
+    param.value for param in DynamicPromptManagementParamLiteral
+)
 
 
 class CallbacksByType(TypedDict):

litellm/utils.py

@@ -3167,7 +3167,7 @@ def get_optional_params_embeddings(  # noqa: PLR0915
     optional_params = {}
     if (
         custom_llm_provider is not None
-        and custom_llm_provider in LlmProviders._member_map_.values()
+        and custom_llm_provider in LlmProvidersSet
     ):
         provider_config = ProviderConfigManager.get_provider_embedding_config(
             model=model,