modelcontextprotocol/python-sdk
Watch
1
0
Fork
You've already forked python-sdk
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Propagate contextvars.Context through anyio streams without modifying SessionMessage (#2298)

Browse source
This commit is contained in:
Marcelo Trylesinski 2026-03-31 12:49:38 -04:00 • committed by GitHub
commit e6235d1667
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 310 additions and 94 deletions
Download patch file Download diff file Expand all files Collapse all files

18
src/mcp/server/streamable_http.py
View file

@ -25,6 +25,8 @@ from starlette.responses import Response
from starlette.types import Receive, Scope, Send
from mcp.server.transport_security import TransportSecurityMiddleware, TransportSecuritySettings
from mcp.shared._context_streams import ContextReceiveStream, ContextSendStream, create_context_streams
from mcp.shared._stream_protocols import ReadStream, WriteStream
from mcp.shared.message import ServerMessageMetadata, SessionMessage
from mcp.shared.version import SUPPORTED_PROTOCOL_VERSIONS
from mcp.types import (
@ -119,10 +121,10 @@ class StreamableHTTPServerTransport:
"""
# Server notification streams for POST requests as well as standalone SSE stream
_read_stream_writer: MemoryObjectSendStream[SessionMessage | Exception] | None = None
_read_stream: MemoryObjectReceiveStream[SessionMessage | Exception] | None = None
_write_stream: MemoryObjectSendStream[SessionMessage] | None = None
_write_stream_reader: MemoryObjectReceiveStream[SessionMessage] | None = None
_read_stream_writer: ContextSendStream[SessionMessage | Exception] | None = None
_read_stream: ContextReceiveStream[SessionMessage | Exception] | None = None
_write_stream: ContextSendStream[SessionMessage] | None = None
_write_stream_reader: ContextReceiveStream[SessionMessage] | None = None
_security: TransportSecurityMiddleware
def __init__(
@ -954,8 +956,8 @@ class StreamableHTTPServerTransport:
self,
) -> AsyncGenerator[
tuple[
MemoryObjectReceiveStream[SessionMessage | Exception],
MemoryObjectSendStream[SessionMessage],
ReadStream[SessionMessage | Exception],
WriteStream[SessionMessage],
],
None,
]:
@ -967,8 +969,8 @@ class StreamableHTTPServerTransport:
# Create the memory streams for this connection
read_stream_writer, read_stream = anyio.create_memory_object_stream[SessionMessage | Exception](0)
write_stream, write_stream_reader = anyio.create_memory_object_stream[SessionMessage](0)
read_stream_writer, read_stream = create_context_streams[SessionMessage | Exception](0)
write_stream, write_stream_reader = create_context_streams[SessionMessage](0)
# Store the streams
self._read_stream_writer = read_stream_writer