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Wrap JSONRPC messages with SessionMessage for metadata support (#590)

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ihrpr
2025-05-02 14:29:00 +01:00
committed by GitHub
parent 3978c6e1b9
commit da0cf22355
22 changed files with 286 additions and 173 deletions
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18
src/mcp/server/websocket.py
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@@ -8,6 +8,7 @@ from starlette.types import Receive, Scope, Send
from starlette.websockets import WebSocket
import mcp.types as types
from mcp.shared.message import SessionMessage
logger = logging.getLogger(__name__)
@@ -22,11 +23,11 @@ async def websocket_server(scope: Scope, receive: Receive, send: Send):
websocket = WebSocket(scope, receive, send)
await websocket.accept(subprotocol="mcp")
read_stream: MemoryObjectReceiveStream[types.JSONRPCMessage | Exception]
read_stream_writer: MemoryObjectSendStream[types.JSONRPCMessage | Exception]
read_stream: MemoryObjectReceiveStream[SessionMessage | Exception]
read_stream_writer: MemoryObjectSendStream[SessionMessage | Exception]
write_stream: MemoryObjectSendStream[types.JSONRPCMessage]
write_stream_reader: MemoryObjectReceiveStream[types.JSONRPCMessage]
write_stream: MemoryObjectSendStream[SessionMessage]
write_stream_reader: MemoryObjectReceiveStream[SessionMessage]
read_stream_writer, read_stream = anyio.create_memory_object_stream(0)
write_stream, write_stream_reader = anyio.create_memory_object_stream(0)
@@ -41,15 +42,18 @@ async def websocket_server(scope: Scope, receive: Receive, send: Send):
await read_stream_writer.send(exc)
continue
await read_stream_writer.send(client_message)
session_message = SessionMessage(client_message)
await read_stream_writer.send(session_message)
except anyio.ClosedResourceError:
await websocket.close()
async def ws_writer():
try:
async with write_stream_reader:
async for message in write_stream_reader:
obj = message.model_dump_json(by_alias=True, exclude_none=True)
async for session_message in write_stream_reader:
obj = session_message.message.model_dump_json(
by_alias=True, exclude_none=True
)
await websocket.send_text(obj)
except anyio.ClosedResourceError:
await websocket.close()