iJ*dZddlZddlmZddlmZddlmZddlm Z m Z ddl Z ddl m Z mZddlmZdd lmZdd lmZdd lmZdd lmZmZmZddlmZdd lmZmZddl m!Z!m"Z"ejFe$Z%GddZ&y)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)ServerMessageMetadataSessionMessageceZdZUdZeed<eeee e zfed<e ed<ddede dzddffd Z ed ed ed efd Zd ed ed eddfdZxZS)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_settingsreturnct|d|vs|jdsd|vsd|vrtd|d|jdsd|z}||_i|_t ||_tjd|y ) 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__s N/root/aria/mcps/aria-brain/venv/lib/python3.12/site-packages/mcp/server/sse.pyr"zSseServerTransport.__init__Ps.  H  3 3D 9SH_PSW_P_"8*-BB  ""3'X~H!$&!45FG EhZPQscopereceivesendcJ K|ddk7r tjdtdt||}|jj |dd{}|r||||d{tdtj dtjd \ }tjd \}t |j<tj d |jd d }|jd |jz} t| dj tjt t"t$fd \ fdtj&4d{} dt(dt*dt,f fd } tj d| j/| |||tj d||fdddd{y777|7 #1d{7swYyxYww)Ntypehttpz%connect_sse received non-HTTP requestz)connect_sse can only handle HTTP requestsFis_postzRequest validation failedzSetting up SSE connectionrzCreated new session with ID: root_pathr z ?session_id=c 2Ktjd4d{4d{jddd{tjd23d{}tjd|jd|jj dddd{Y777{7Z7 6dddd{7n#1d{7swYnxYwdddd{7y#1d{7swYyxYww) NzStarting SSE writerr)eventdatazSent endpoint event: zSending message via SSE: messageT)by_alias exclude_none)r%r&r-r8model_dump_json)session_messageclient_post_uri_datasse_stream_writerwrite_stream_readers r) sse_writerz2SseServerTransport.connect_sse..sse_writers LL. /(  *=  ',,zK_-`aaa 45I4JKL-@/LL#<_DDCDCCC%C)C *C-A C8C 9C>DDCCCC DCDC- !C$"C- )D0 D;C><DDD DDr+r,r-cKt|||d{jd{jd{tjdy7M777!w)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?s r)response_wrapperz8SseServerTransport.connect_sse..response_wrappersx f)2CZde7D)//111)00222 r@r?s @@@@@@@r) connect_ssezSseServerTransport.connect_sseys  =F " LL@ AHI I%)#~~>>wPU>VV  6 6 689 9 01+0*K*KA*N'K,1,M,Ma,P) )W 0B!!*- 4ZLAB IIk2. (1'7'7'H ?H#H# H# H#H H H H#ctKtjdt||}|jj |dd{}|r||||d{S|j j d}|4tjdtdd}||||d{S t| }tjd ||jj |} | s7tjd |tdd}||||d{S|jd{} tjd|  tjj| } tjd| t'|} t)| | }tjd|tdd}||||d{| j%|d{y777V#t$r;tjd |td d}||||d{7cYSwxYw7'7#t $rY} tj#dtdd}||||d{7| j%| d{7Yd} ~ yd} ~ wwxYw77­w)NzHandling POST messageTr1rGz#Received request without session_idzsession_id is requiredi) status_code)rPzParsed session ID: zReceived invalid session ID: zInvalid session IDzCould not find session for ID: zCould not find sessionizReceived JSON: zValidated client message: zFailed to parse messagezCould not parse message)request_context)metadataz#Sending session message to writer: Accepted)r%r&r rrK query_paramsrNwarningr rr$rbodytypesJSONRPCMessagemodel_validate_jsonr exceptionr-rr)r'r+r,r-rUrVsession_id_paramresponserGwriterrdr8errr_r<s r)handle_post_messagez&SseServerTransport.handle_post_messages| ,-%) $~~>>wPT>UU 'w== ="//33LA  # NN@ A 8cJH!%$77 7 8"23J LL.zl; < **..z: NN>tDG LL5gY? @)A(8D :?:KLMJC8ugt,,,kk/***WV= 8  8 NN:;K:LM N 4#FH!%$777 7 88#     6 7 9sKH5'40 0 0++c" " "    -*sAJ8G9J8G<AJ8)G?*J8/$HAJ8"I #J8:I ;J87IA J8J4J83J64J8<J8?J8;I=I>IJ8IJ8 J8 J1/J,J J,!J$"J,'J8,J11J86J8)N)__name__ __module__ __qualname____doc__rR__annotations__rQrr r Exceptionrrr"rrrrr[rm __classcell__)r(s@r)rr@s Nt%;NYrs`%N* R$-&(00E   8 $y+y+r*