)`i dZddlZddlmZddlZddlmZddlmZddl m Z m Z ddl m Z ddlmZdd lmZdd lmZmZdd lmZmZmZmZmZmZmZejeZGd d Z dS)a TaskResultHandler - Integrated handler for tasks/result endpoint. This implements the dequeue-send-wait pattern from the MCP Tasks spec: 1. Dequeue all pending messages for the task 2. Send them to the client via transport with relatedRequestId routing 3. Wait if task is not in terminal state 4. Return final result when task completes This is the core of the task message queue pattern. N)Any) ServerSession)McpError)RELATED_TASK_METADATA_KEY is_terminal)TaskMessageQueue)Resolver) TaskStore)ServerMessageMetadataSessionMessage)INVALID_PARAMS ErrorDataGetTaskPayloadRequestGetTaskPayloadResultJSONRPCMessageRelatedTaskMetadata RequestIdceZdZdZdedefdZdededdfd Z d e ded e de fd Z d eded e ddfdZd eddfdZd e deeefdefdZd e dedefdZdS)TaskResultHandleraW Handler for tasks/result that implements the message queue pattern. This handler: 1. Dequeues pending messages (elicitations, notifications) for the task 2. Sends them to the client via the response stream 3. Waits for responses and resolves them back to callers 4. Blocks until task reaches terminal state 5. Returns the final result Usage: # Create handler with store and queue handler = TaskResultHandler(task_store, message_queue) # Register it with the server @server.experimental.get_task_result() async def handle_task_result(req: GetTaskPayloadRequest) -> GetTaskPayloadResult: ctx = server.request_context return await handler.handle(req, ctx.session, ctx.request_id) # Or use the convenience method handler.register(server) storequeuec0||_||_i|_dSN)_store_queue_pending_requests)selfrrs /home/jaya/work/projects/VOICE-AGENT/VIET/agent-env/lib/python3.11/site-packages/mcp/server/experimental/task_result_handler.py__init__zTaskResultHandler.__init__?s   LNsessionmessagereturnNc@K||d{VdS)zp Send a message via the session. This is a helper for delivering queued task messages. N) send_message)rr!r"s rr%zTaskResultHandler.send_messageIs4""7+++++++++++r request request_idcK|jj} |j|d{V}|&t t t d|||||d{Vt|j r|j |d{V}t|}t| di}|J| d} | dpi} i| || d<tj| Stjd|iS||d{VE)ah Handle a tasks/result request. This implements the dequeue-send-wait loop: 1. Dequeue all pending messages 2. Send each via transport with relatedRequestId = this request's ID 3. If task not terminal, wait for status change 4. Loop until task is terminal 5. Return final result Args: request: The GetTaskPayloadRequest session: The server session for sending messages request_id: The request ID for relatedRequestId routing Returns: GetTaskPayloadResult with the task's final payload TNzTask not found: )coder")taskId)by_alias_meta)paramsr*rget_taskrrr _deliver_queued_messagesrstatus get_resultrr model_dumpgetrmodel_validate_wait_for_task_update) rr&r!r'task_idtaskresult related_taskrelated_task_meta result_data existing_metas rhandlezTaskResultHandler.handleUs0.' 6--g66666666D|+ <7 < <//*MM M M M M M M M4;'' Y#{55g>>>>>>>> 3'BBB 5NP\PgPgquPgPvPv4w!%"("3"3T"3"B"BK4?OOG4L4L4RPRM+Qm+Q?P+QK(/>{KKK+:GEV;WXXX,,W55 5 5 5 5 5 5 59 6r r6cK |j|d{V}|dS|jdkr|j|j}||j|j|<t d||jtt|j t|}| ||d{V)z Dequeue and send all pending messages for a task. Each message is sent via the session's write stream with relatedRequestId set so responses route back to this stream. TNr&z)Delivering queued message for task %s: %s)related_request_id)r"metadata) rdequeuetyperesolveroriginal_request_idrloggerdebugr rr"r r%)rr6r!r'r" original_idsession_messages rr/z*TaskResultHandler._deliver_queued_messagess > K//88888888G|y((W-=-I%9 *:A:JD*;7 LLDgw| \ \ \-&w77.*MMMO##G_== = = = = = = =' >r cKtj4d{Vdfd }dfd }||dddd{VdS#1d{VswxYwYdS)z Wait for task to be updated (status change or new message). Races between store update and queue message - first one wins. Nr#cK jd{Vn#t$rYnwxYwjdS#jwxYwr)rwait_for_update Exception cancel_scopecancelrr6tgsrwait_for_storez?TaskResultHandler._wait_for_task_update..wait_for_stores-+55g>>>>>>>>>> DO**,,,,,BO**,,,,! &A 3A3AA,cK jd{Vn#t$rYnwxYwjdS#jwxYwr)rwait_for_messagerLrMrNrOsrwait_for_queuez?TaskResultHandler._wait_for_task_update..wait_for_queues-+66w?????????? DO**,,,,,BO**,,,,rR)r#N)anyiocreate_task_group start_soon)rr6rQrUrPs`` @rr5z'TaskResultHandler._wait_for_task_updatesK *,, * * * * * * * - - - - - - - - - - - - - - - - MM. ) ) ) MM. ) ) )' * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *s;A-- A7:A7responsec|j|d}|+|s||dSdS)aM Route a response back to the waiting resolver. This is called when a response arrives for a queued request. Args: request_id: The request ID from the response response: The response data Returns: True if response was routed, False if no pending request NTF)rpopdone set_result)rr'rYrCs rroute_responsez TaskResultHandler.route_responsesM)--j$??        ) ) )4ur errorc|j|d}|8|s$|t |dSdS)a Route an error back to the waiting resolver. Args: request_id: The request ID from the error response error: The error data Returns: True if error was routed, False if no pending request NTF)rr[r\ set_exceptionr)rr'r_rCs r route_errorzTaskResultHandler.route_errorsS)--j$??      " "8E?? 3 3 34ur )__name__ __module__ __qualname____doc__r rrrr r%rrrr=strr/r5dictrboolr^rrbr rrr&sm0OO OOOO , ,  ,  , , , ,66&6666 66  66666666p>>> >  >>>>B*3*4****6d38nQU&i dr r)!rfloggingtypingrrVmcp.server.sessionrmcp.shared.exceptionsr%mcp.shared.experimental.tasks.helpersrr+mcp.shared.experimental.tasks.message_queuer&mcp.shared.experimental.tasks.resolverr #mcp.shared.experimental.tasks.storer mcp.shared.messager r mcp.typesr rrrrrr getLoggerrcrErrjr rrvsi   ,,,,,,******XXXXXXXXHHHHHH;;;;;;999999DDDDDDDD  8 $ $EEEEEEEEEEr