mirror of
https://github.com/aljazceru/mcp-python-sdk.git
synced 2025-12-19 06:54:18 +01:00
59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
import logging
|
|
from contextlib import asynccontextmanager
|
|
|
|
import anyio
|
|
from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
|
|
from starlette.types import Receive, Scope, Send
|
|
from starlette.websockets import WebSocket
|
|
|
|
from mcp_python.types import JSONRPCMessage
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
@asynccontextmanager
|
|
async def websocket_server(scope: Scope, receive: Receive, send: Send):
|
|
"""
|
|
WebSocket server transport for MCP. This is an ASGI application, suitable to be used with a framework like Starlette and a server like Hypercorn.
|
|
"""
|
|
|
|
websocket = WebSocket(scope, receive, send)
|
|
await websocket.accept(subprotocol="mcp")
|
|
|
|
read_stream: MemoryObjectReceiveStream[JSONRPCMessage | Exception]
|
|
read_stream_writer: MemoryObjectSendStream[JSONRPCMessage | Exception]
|
|
|
|
write_stream: MemoryObjectSendStream[JSONRPCMessage]
|
|
write_stream_reader: MemoryObjectReceiveStream[JSONRPCMessage]
|
|
|
|
read_stream_writer, read_stream = anyio.create_memory_object_stream(0)
|
|
write_stream, write_stream_reader = anyio.create_memory_object_stream(0)
|
|
|
|
async def ws_reader():
|
|
try:
|
|
async with read_stream_writer:
|
|
async for message in websocket.iter_json():
|
|
try:
|
|
client_message = JSONRPCMessage.model_validate(message)
|
|
except Exception as exc:
|
|
await read_stream_writer.send(exc)
|
|
continue
|
|
|
|
await read_stream_writer.send(client_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(by_alias=True, mode="json")
|
|
await websocket.send_json(obj)
|
|
except anyio.ClosedResourceError:
|
|
await websocket.close()
|
|
|
|
async with anyio.create_task_group() as tg:
|
|
tg.start_soon(ws_reader)
|
|
tg.start_soon(ws_writer)
|
|
yield (read_stream, write_stream)
|