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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/client/stdio/__init__.py
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@ -11,6 +11,7 @@ from anyio.streams.text import TextReceiveStream
from pydantic import BaseModel, Field
import mcp.types as types
from mcp.shared.message import SessionMessage
from .win32 import (
create_windows_process,
@ -98,11 +99,11 @@ async def stdio_client(server: StdioServerParameters, errlog: TextIO = sys.stder
Client transport for stdio: this will connect to a server by spawning a
process and communicating with it over stdin/stdout.
"""
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)
@ -143,7 +144,8 @@ async def stdio_client(server: StdioServerParameters, errlog: TextIO = sys.stder
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()
@ -152,8 +154,10 @@ async def stdio_client(server: StdioServerParameters, errlog: TextIO = sys.stder
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 process.stdin.send(
(json + "\n").encode(
encoding=server.encoding,