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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
commit da0cf22355
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1 changed files with 286 additions and 173 deletions
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18
src/mcp/server/stdio.py
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@ -27,6 +27,7 @@ import anyio.lowlevel
from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
import mcp.types as types
from mcp.shared.message import SessionMessage
@asynccontextmanager
@ -47,11 +48,11 @@ async def stdio_server(
if not stdout:
stdout = anyio.wrap_file(TextIOWrapper(sys.stdout.buffer, encoding="utf-8"))
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)
@ -66,15 +67,18 @@ async def stdio_server(
await read_stream_writer.send(exc)
continue
await read_stream_writer.send(message)
session_message = SessionMessage(message)
await read_stream_writer.send(session_message)
except anyio.ClosedResourceError:
await anyio.lowlevel.checkpoint()
async def stdout_writer():
try:
async with write_stream_reader:
async for message in write_stream_reader:
json = message.model_dump_json(by_alias=True, exclude_none=True)
async for session_message in write_stream_reader:
json = session_message.message.model_dump_json(
by_alias=True, exclude_none=True
)
await stdout.write(json + "\n")
await stdout.flush()
except anyio.ClosedResourceError: