o h"*@sdZddlZddlmZddlmZddlmZddlm Z m Z ddl Z ddl m Z mZddlmZdd lmZdd lmZdd lmZdd lmZmZmZddlmZdd lmZmZddl m!Z!m"Z"e#e$Z%GdddZ&dS)a SSE Server Transport Module This module implements a Server-Sent Events (SSE) transport layer for MCP servers. Example usage: ``` # Create an SSE transport at an endpoint sse = SseServerTransport("/messages/") # Create Starlette routes for SSE and message handling routes = [ Route("/sse", endpoint=handle_sse, methods=["GET"]), Mount("/messages/", app=sse.handle_post_message), ] # Define handler functions async def handle_sse(request): async with sse.connect_sse( request.scope, request.receive, request._send ) as streams: await app.run( streams[0], streams[1], app.create_initialization_options() ) # Return empty response to avoid NoneType error return Response() # Create and run Starlette app starlette_app = Starlette(routes=routes) uvicorn.run(starlette_app, host="127.0.0.1", port=port) ``` Note: The handle_sse function must return a Response to avoid a "TypeError: 'NoneType' object is not callable" error when client disconnects. The example above returns an empty Response() after the SSE connection ends to fix this. See SseServerTransport class documentation for more details. N)asynccontextmanager)Any)quote)UUIDuuid4)MemoryObjectReceiveStreamMemoryObjectSendStream)ValidationError)EventSourceResponse)Request)Response)ReceiveScopeSend)TransportSecurityMiddlewareTransportSecuritySettings)ServerMessageMetadataSessionMessagecseZdZUdZeed<eeee e Bfed<e ed<ddede dBddffd d Z ed ed ed efddZd ed ed eddfddZZS)SseServerTransporta SSE server transport for MCP. This class provides _two_ ASGI applications, suitable to be used with a framework like Starlette and a server like Hypercorn: 1. connect_sse() is an ASGI application which receives incoming GET requests, and sets up a new SSE stream to send server messages to the client. 2. handle_post_message() is an ASGI application which receives incoming POST requests, which should contain client messages that link to a previously-established SSE session. _endpoint_read_stream_writers _securityNendpointsecurity_settingsreturncsxtd|vs|dsd|vsd|vrtd|d|ds'd|}||_i|_t||_t d|d S) a Creates a new SSE server transport, which will direct the client to POST messages to the relative path given. Args: endpoint: A relative path where messages should be posted (e.g., "/messages/"). security_settings: Optional security settings for DNS rebinding protection. Note: We use relative paths instead of full URLs for several reasons: 1. Security: Prevents cross-origin requests by ensuring clients only connect to the same origin they established the SSE connection with 2. Flexibility: The server can be mounted at any path without needing to know its full URL 3. Portability: The same endpoint configuration works across different environments (development, staging, production) Raises: ValueError: If the endpoint is a full URL instead of a relative path z://z//?#zGiven endpoint: z] is not a relative path (e.g., '/messages/'), expecting a relative path (e.g., '/messages/')./z.SseServerTransport initialized with endpoint: N) super__init__ startswith ValueErrorrrrrloggerdebug)selfrr __class__O/var/www/html/openai_agents/venv/lib/python3.10/site-packages/mcp/server/sse.pyrPs "   zSseServerTransport.__init__scopereceivesendc s|ddkrtdtdt||}|jj|ddIdH}|r/||||IdHtdtdtd \}td \}t |j <td | d d }| d |j } t| djtjtttfd \fddt4IdH4} dtdtdtffdd } td| | |||td||fVWdIdHdS1IdHswYdS)Ntypehttpz%connect_sse received non-HTTP requestz)connect_sse can only handle HTTP requestsFis_postzRequest validation failedzSetting up SSE connectionrzCreated new session with ID: root_pathrz ?session_id=c std4IdH^4IdHAddIdHtd2z3dHW}td|d|jjddddIdHq)6WdIdHn 1IdHsZwYWdIdHdS1IdHspwYdS) NzStarting SSE writerr)eventdatazSent endpoint event: zSending message via SSE: messageT)by_alias exclude_none)r"r#r+r4model_dump_json)session_message)client_post_uri_datasse_stream_writerwrite_stream_readerr'r( sse_writers  Xz2SseServerTransport.connect_sse..sse_writerr)r*r+csLtd|||IdHIdHIdHtddS)z The EventSourceResponse returning signals a client close / disconnect. In this case we close our side of the streams to signal the client that the connection has been closed. )contentdata_sender_callableNzClient session disconnected )r acloseloggingr#)r)r*r+)read_stream_writer session_idsse_stream_readerr<r;r'r(response_wrappers  z8SseServerTransport.connect_sse..response_wrapperzStarting SSE response taskzYielding read and write streams)r"errorr!r rvalidate_requestr#anyiocreate_memory_object_streamrrgetrstriprrhexdictstrrcreate_task_grouprr r start_soon) r$r)r*r+requesterror_response read_stream write_streamr0full_message_path_for_clienttgrDr')r9rArBrCr:r<r;r( connect_sseys6      "   .zSseServerTransport.connect_ssec stdt||}|jj|ddIdH}|r!||||IdHS|jd}|dur?tdtddd}||||IdHSzt |d }td |Wn t yntd |td dd}||||IdHYSw|j |} | std |tddd}||||IdHS| IdH} td| zt j| } td| Wn/ty} z#tdtddd}||||IdH| | IdHWYd} ~ dSd} ~ wwt|d} t| | d}td|tddd}||||IdH| |IdHdS)NzHandling POST messageTr.rBz#Received request without session_idzsession_id is requiredi) status_code)rKzParsed session ID: zReceived invalid session ID: zInvalid session IDzCould not find session for ID: zCould not find sessionizReceived JSON: zValidated client message: zFailed to parse messagezCould not parse message)request_context)metadataz#Sending session message to writer: Accepted)r"r#r rrF query_paramsrIwarningr rr!rbodytypesJSONRPCMessagemodel_validate_jsonr exceptionr+rr)r$r)r*r+rPrQsession_id_paramresponserBwriterr^r4errrYr8r'r'r(handle_post_messagesV                z&SseServerTransport.handle_post_message)N)__name__ __module__ __qualname____doc__rM__annotations__rLrrr Exceptionrrrrrr rrVrg __classcell__r'r'r%r(r@s   )"Or)'rkr@ contextlibrtypingr urllib.parseruuidrrrGanyio.streams.memoryrrpydanticr sse_starletter starlette.requestsr starlette.responsesr starlette.typesr rr mcp.typesr_mcp.server.transport_securityrrmcp.shared.messagerr getLoggerrhr"rr'r'r'r(s$'