rename mcp_python to mcp

src/mcp/shared/memory.py

@@ -0,0 +1,87 @@
+"""
+In-memory transports
+"""
+
+from contextlib import asynccontextmanager
+from datetime import timedelta
+from typing import AsyncGenerator
+
+import anyio
+from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
+
+from mcp.client.session import ClientSession
+from mcp.server import Server
+from mcp.types import JSONRPCMessage
+
+MessageStream = tuple[
+    MemoryObjectReceiveStream[JSONRPCMessage | Exception],
+    MemoryObjectSendStream[JSONRPCMessage],
+]
+
+
+@asynccontextmanager
+async def create_client_server_memory_streams() -> (
+    AsyncGenerator[tuple[MessageStream, MessageStream], None]
+):
+    """
+    Creates a pair of bidirectional memory streams for client-server communication.
+
+    Returns:
+        A tuple of (client_streams, server_streams) where each is a tuple of
+        (read_stream, write_stream)
+    """
+    # Create streams for both directions
+    server_to_client_send, server_to_client_receive = anyio.create_memory_object_stream[
+        JSONRPCMessage | Exception
+    ](1)
+    client_to_server_send, client_to_server_receive = anyio.create_memory_object_stream[
+        JSONRPCMessage | Exception
+    ](1)
+
+    client_streams = (server_to_client_receive, client_to_server_send)
+    server_streams = (client_to_server_receive, server_to_client_send)
+
+    async with (
+        server_to_client_receive,
+        client_to_server_send,
+        client_to_server_receive,
+        server_to_client_send,
+    ):
+        yield client_streams, server_streams
+
+
+@asynccontextmanager
+async def create_connected_server_and_client_session(
+    server: Server,
+    read_timeout_seconds: timedelta | None = None,
+    raise_exceptions: bool = False,
+) -> AsyncGenerator[ClientSession, None]:
+    """Creates a ClientSession that is connected to a running MCP server."""
+    async with create_client_server_memory_streams() as (
+        client_streams,
+        server_streams,
+    ):
+        client_read, client_write = client_streams
+        server_read, server_write = server_streams
+
+        # Create a cancel scope for the server task
+        async with anyio.create_task_group() as tg:
+            tg.start_soon(
+                lambda: server.run(
+                    server_read,
+                    server_write,
+                    server.create_initialization_options(),
+                    raise_exceptions=raise_exceptions,
+                )
+            )
+
+            try:
+                async with ClientSession(
+                    read_stream=client_read,
+                    write_stream=client_write,
+                    read_timeout_seconds=read_timeout_seconds,
+                ) as client_session:
+                    await client_session.initialize()
+                    yield client_session
+            finally:
+                tg.cancel_scope.cancel()