k i &dZddlZddlmZmZmZmZmZmZm Z ddl m Z m Z m Z ddlmZddlmZddlmZddlmZmZdd lmZd d lmZd d lmZejeZ ee ee!efgee fZ"Gd deZ#dS)aSemantic router middleware for intent-based routing. This module provides a middleware that routes requests based on semantic similarity to predefined intents using Redis and vector embeddings. Compatible with LangChain's AgentMiddleware protocol for use with create_agent. N)Any AwaitableCallableDictListOptionalUnion)ModelCallResult ModelRequest ModelResponse) ToolMessage)ToolCallRequest)Command) RoutingConfigSemanticRouter)Route)AsyncRedisMiddleware)SemanticRouterConfigc veZdZUdZeed<eed<eee fed<deddffd Z dd Z d e e eeefefdefd Zd edeefd Z ddedee dee ge ffdZdedeegeefdefdZdedeegee eeffde eeffdZxZS)SemanticRouterMiddlewareakMiddleware that routes requests based on semantic similarity. Uses redisvl.extensions.router.SemanticRouter to classify user intents and route requests to appropriate handlers. This is useful for: - Directing queries to specialized agents - Triggering specific workflows based on intent - Adding routing metadata for downstream processing Example: ```python from langgraph.middleware.redis import ( SemanticRouterMiddleware, SemanticRouterConfig, ) routes = [ {"name": "greeting", "references": ["hello", "hi", "hey"]}, {"name": "support", "references": ["help", "issue", "problem"]}, ] config = SemanticRouterConfig( redis_url="redis://localhost:6379", routes=routes, ) middleware = SemanticRouterMiddleware(config) # Register custom handler for greeting route @middleware.register_route_handler("greeting") async def handle_greeting(request, route_match): return {"content": "Hello! How can I help you today?"} ``` _router_config_route_handlersconfigreturnNcft|||_i|_dS)z}Initialize the semantic router middleware. Args: config: Configuration for the semantic router. N)super__init__rr)selfr __class__s C:\Users\Dell Inspiron 16\Desktop\tws\AgrotaPowerBi\back-agrota-powerbi\mcp-client-agrota\venv\Lib\site-packages\langgraph/middleware/redis/semantic_router.pyrz!SemanticRouterMiddleware.__init__Fs2     !cKg}|jjD]T}|d|dd}|d |d|d<td i|}||Ut |jj|jj}|jj||d}|jj r|jj |d<n|jj r|jj |d <|jj |jj |d <td i||_ dS) aSet up the SemanticRouter instance. Note: SemanticRouter from redisvl uses synchronous Redis operations internally, so we must provide redis_url and let it manage its own sync connection rather than passing our async client. name references)r%r&distance_thresholdN)max_kaggregation_method)r%routesrouting_config redis_urlconnection_kwargs vectorizer)rr*getrappendrr(r)r%r,connection_argsr.rr)r r* route_config route_kwargsrouter+ router_kwargss r" _setup_asyncz%SemanticRouterMiddleware._setup_asyncPsB L/ ! !L$V,*<8,,L  455A5ABV5W 12))L))E MM% ',$#|>    L%,) )  < ! N)-)?M+ & & \ ) N151MM- . < " .*.,*AM, '%66 66 r#messagesc8|sdSt|D]}t|tr5|dd}|dkr|ddcSLt |ddpt |dd}|dvrt |ddcSdS)zExtract the query to use for routing. Args: messages: List of messages from the request. Returns: The extracted query string. roleusercontenttypeN)r<human)reversed isinstancedictr0getattr)r r8messager;msg_types r"_extract_queryz'SemanticRouterMiddleware._extract_query|s 2 )) ; ;G'4(( ;{{62..6>>";;y"55555"#7FD99WVT>>000"7Ir:::::1rr#queryc4|sdS||S)zGet the matching route for a query. Args: query: The user query to route. Returns: The route match object, or None if no match. N)r)r rGs r" _get_routez#SemanticRouterMiddleware._get_routes# 4||E"""r# route_namehandlercNdtdtffd }| ||S|S)aRegister a handler for a specific route. Can be used as a decorator or called directly. Args: route_name: The name of the route to handle. handler: Optional handler function. If not provided, returns a decorator. Returns: The handler function, or a decorator if handler not provided. Example: ```python # As decorator @middleware.register_route_handler("greeting") async def handle_greeting(request, route_match): return {"content": "Hello!"} # Direct registration middleware.register_route_handler("greeting", handle_greeting) ``` fnrc|j<|SN)r)rMrJr s r" decoratorzBSemanticRouterMiddleware.register_route_handler..decorators/1D  ,Ir#) RouteHandler)r rJrKrPs`` r"register_route_handlerz/SemanticRouterMiddleware.register_route_handlersS6 , <         9W%% %r#requestcK|d{Vt|tr|dg}nt |dg}||}|s||d{VSd} ||}n<#t$r/}|jst d|Yd}~nd}~wwxYw||j }||j vr1|t |ddd}|j |||d{VSt|tr.d|vri|d<||dd<t |dd|dd<||d{VS) aTWrap a model call with semantic routing. This method is part of the LangChain AgentMiddleware protocol. Determines the route based on the user's message and either: - Calls a registered route handler if one exists - Adds routing info to the request and calls the default handler Args: request: The model request containing messages. handler: The async function to call the model. Returns: The model response. Raises: Exception: If graceful_degradation is False and routing fails. Nr8z Router failed, passing through: distance)r%rUruntimer5route_distance) _ensure_initialized_asyncrArBr0rCrFrI Exception_graceful_degradationloggerwarningr%r) r rSrKr8rG route_matcherJ route_infos r"awrap_model_callz)SemanticRouterMiddleware.awrap_model_calls,,,......... gt $ $ 8{{:r22HHw B77H##H-- * )))))))) )  C//%00KK C C C-  NNAaAA B B B B B B B B C  "$)JT111& ' Z F F >T1*=gzRRRRRRRRR'4(( G++)+GI&.8 "7+7>T88 "#34WW%%%%%%%%%sB C%%CCc(K||d{VS)avPass through tool calls without routing. This method is part of the LangChain AgentMiddleware protocol. Semantic router only applies to model calls, not tool calls. Args: request: The tool call request. handler: The async function to execute the tool. Returns: The tool result from the handler. Nr/)r rSrKs r"awrap_tool_callz(SemanticRouterMiddleware.awrap_tool_call s*&WW%%%%%%%%%r#)rNrO)__name__ __module__ __qualname____doc__r__annotations__rrstrrQrr7rr rBrrFrrIrrRr rr r r`rLangChainToolMessagerrb __classcell__)r!s@r"rrs  D !!!!#|+,,,,"3"""""""*7*7*7*7XtE$sCx.#2E,F'GC6 # # # # # #BF!!!(0(>! <.,. /!!!!F@&@&<.)M*BBC@&  @&@&@&@&D& &  y/CW/L)MN N & #W, - &&&&&&&&r#r)$rfloggingtypingrrrrrrr !langchain.agents.middleware.typesr r r langchain_core.messagesr rilanggraph.prebuilt.tool_noderlanggraph.typesrredisvl.extensions.routerrr redisvl.extensions.router.schemaraiortypesr getLoggerrcr[rhrQrr/r#r"rvs}HHHHHHHHHHHHHHHHHH HGGGGG888888######CCCCCCCC222222%%%%%%''''''  8 $ $tCH~6 /8RRS }&}&}&}&}&3}&}&}&}&}&r#