Max
672 lines
26 KiB
Python
672 lines
26 KiB
Python
"""Tests for StreamableHTTPSessionManager."""
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import json
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import logging
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from collections.abc import Iterator
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from typing import Any
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from unittest.mock import AsyncMock, patch
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import anyio
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import httpx2
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import pytest
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from mcp_types import INVALID_REQUEST, ListToolsResult, PaginatedRequestParams
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from starlette.types import Message, Scope
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from mcp import Client
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from mcp.client.streamable_http import streamable_http_client
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from mcp.server import Server, ServerRequestContext, streamable_http_manager
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from mcp.server.auth.middleware.bearer_auth import AuthenticatedUser
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from mcp.server.auth.provider import AccessToken
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from mcp.server.streamable_http import MCP_SESSION_ID_HEADER, StreamableHTTPServerTransport
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from mcp.server.streamable_http_manager import DEFAULT_MAX_REQUEST_BODY_SIZE, StreamableHTTPSessionManager
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@pytest.mark.anyio
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async def test_run_can_only_be_called_once():
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"""Test that run() can only be called once per instance."""
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app = Server("test-server")
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manager = StreamableHTTPSessionManager(app=app)
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# First call should succeed
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async with manager.run():
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pass
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# Second call should raise RuntimeError
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with pytest.raises(RuntimeError) as excinfo:
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async with manager.run():
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pass # pragma: no cover
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assert "StreamableHTTPSessionManager .run() can only be called once per instance" in str(excinfo.value)
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@pytest.mark.anyio
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async def test_run_prevents_concurrent_calls():
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"""Test that concurrent calls to run() are prevented."""
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app = Server("test-server")
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manager = StreamableHTTPSessionManager(app=app)
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errors: list[Exception] = []
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async def try_run():
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try:
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async with manager.run():
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# Simulate some work
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await anyio.sleep(0.1)
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except RuntimeError as e:
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errors.append(e)
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# Try to run concurrently
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async with anyio.create_task_group() as tg:
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tg.start_soon(try_run)
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tg.start_soon(try_run)
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# One should succeed, one should fail
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assert len(errors) == 1
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assert "StreamableHTTPSessionManager .run() can only be called once per instance" in str(errors[0])
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@pytest.mark.anyio
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async def test_handle_request_without_run_raises_error():
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"""Test that handle_request raises error if run() hasn't been called."""
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app = Server("test-server")
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manager = StreamableHTTPSessionManager(app=app)
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# Mock ASGI parameters
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scope: Scope = {"type": "http", "method": "POST", "path": "/test", "headers": []}
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async def receive() -> Message:
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return {"type": "http.request", "body": b""}
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async def send(message: Message): # pragma: no cover
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pass
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# Should raise error because run() hasn't been called
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with pytest.raises(RuntimeError) as excinfo:
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await manager.handle_request(scope, receive, send)
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assert "Task group is not initialized. Make sure to use run()." in str(excinfo.value)
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@pytest.mark.anyio
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async def test_oversized_content_length_is_rejected_before_body_read_or_session_creation() -> None:
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"""SDK-defined: an oversized declared body gets HTTP 413 before the server reads it or creates a session."""
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manager = StreamableHTTPSessionManager(app=Server("test-size-limit"), max_request_body_size=8)
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sent_messages: list[Message] = []
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receive = AsyncMock(return_value={"type": "http.request", "body": b"123456789", "more_body": False})
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async def send(message: Message) -> None:
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sent_messages.append(message)
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scope: Scope = {
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"type": "http",
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"method": "POST",
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"path": "/mcp",
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"headers": [(b"content-length", b"9")],
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}
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async with manager.run():
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await manager.handle_request(scope, receive, send)
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assert manager._server_instances == {}
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response_start = next(message for message in sent_messages if message["type"] == "http.response.start")
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assert response_start["status"] == 413
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receive.assert_not_awaited()
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@pytest.mark.anyio
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@pytest.mark.parametrize("headers", [[], [(b"content-length", b"invalid")], [(b"content-length", b"8")]])
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async def test_oversized_streamed_body_is_rejected_before_session_creation(
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headers: list[tuple[bytes, bytes]],
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) -> None:
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"""SDK-defined: streamed bodies enforce the limit with missing, invalid, or understated length."""
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manager = StreamableHTTPSessionManager(app=Server("test-streamed-size-limit"), max_request_body_size=8)
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sent_messages: list[Message] = []
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request_messages: Iterator[Message] = iter(
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[
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{"type": "http.request", "body": b"1234", "more_body": True},
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{"type": "http.request", "body": b"56789", "more_body": False},
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]
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)
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async def receive() -> Message:
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return next(request_messages)
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async def send(message: Message) -> None:
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sent_messages.append(message)
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scope: Scope = {"type": "http", "method": "POST", "path": "/mcp", "headers": headers}
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async with manager.run():
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await manager.asgi_app(scope, receive, send)
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assert manager._server_instances == {}
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response_start = next(message for message in sent_messages if message["type"] == "http.response.start")
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assert response_start["status"] == 413
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def test_request_body_limit_defaults_to_four_mib() -> None:
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"""SDK-defined: Streamable HTTP request bodies are limited to 4 MiB by default."""
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manager = StreamableHTTPSessionManager(app=Server("test-default-size-limit"))
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assert manager.max_request_body_size == DEFAULT_MAX_REQUEST_BODY_SIZE == 4 * 1024 * 1024
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@pytest.mark.parametrize("max_request_body_size", [0, -1])
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def test_request_body_limit_rejects_non_positive_values(max_request_body_size: int) -> None:
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"""SDK-defined: callers cannot disable request-size protection with a non-positive value."""
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with pytest.raises(ValueError) as exc_info:
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StreamableHTTPSessionManager(app=Server("test-invalid-size-limit"), max_request_body_size=max_request_body_size)
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assert str(exc_info.value) == "max_request_body_size must be a positive number of bytes"
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class TestException(Exception):
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__test__ = False # Prevent pytest from collecting this as a test class
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pass
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@pytest.fixture
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async def running_manager():
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app = Server("test-cleanup-server")
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# It's important that the app instance used by the manager is the one we can patch
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manager = StreamableHTTPSessionManager(app=app)
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async with manager.run():
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# Patch app.run here if it's simpler, or patch it within the test
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yield manager, app
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@pytest.mark.anyio
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async def test_stateful_session_cleanup_on_graceful_exit(running_manager: tuple[StreamableHTTPSessionManager, Server]):
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manager, _app = running_manager
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# The manager's `run_server` task drives `serve_loop` directly (the manager
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# owns lifespan); patch that seam so the loop returns immediately and we
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# can observe the cleanup that follows.
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mock_serve = AsyncMock(return_value=None)
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sent_messages: list[Message] = []
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async def mock_send(message: Message):
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sent_messages.append(message)
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scope = {
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"type": "http",
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"method": "POST",
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"path": "/mcp",
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"headers": [(b"content-type", b"application/json")],
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}
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async def mock_receive():
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return {"type": "http.request", "body": b"", "more_body": False}
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# Trigger session creation
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with patch("mcp.server.streamable_http_manager.serve_loop", mock_serve):
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await manager.handle_request(scope, mock_receive, mock_send)
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# Extract session ID from response headers
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session_id = None
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for msg in sent_messages: # pragma: no branch
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if msg["type"] == "http.response.start": # pragma: no branch
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for header_name, header_value in msg.get("headers", []): # pragma: no branch
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if header_name.decode().lower() == MCP_SESSION_ID_HEADER.lower():
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session_id = header_value.decode()
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break
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if session_id: # Break outer loop if session_id is found # pragma: no branch
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break
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assert session_id is not None, "Session ID not found in response headers"
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mock_serve.assert_called_once()
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# At this point, mock_serve has completed, and the finally block in
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# StreamableHTTPSessionManager's run_server should have executed.
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# To ensure the task spawned by handle_request finishes and cleanup occurs:
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# Give other tasks a chance to run. This is important for the finally block.
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await anyio.sleep(0.01)
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assert session_id not in manager._server_instances, (
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"Session ID should be removed from _server_instances after graceful exit"
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)
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assert not manager._server_instances, "No sessions should be tracked after the only session exits gracefully"
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@pytest.mark.anyio
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async def test_stateful_session_cleanup_on_exception(running_manager: tuple[StreamableHTTPSessionManager, Server]):
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manager, _app = running_manager
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mock_serve = AsyncMock(side_effect=TestException("Simulated crash"))
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sent_messages: list[Message] = []
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async def mock_send(message: Message):
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sent_messages.append(message)
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# If an exception occurs, the transport might try to send an error response
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# For this test, we mostly care that the session is established enough
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# to get an ID
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if message["type"] == "http.response.start" and message["status"] >= 500: # pragma: no cover
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pass # Expected if TestException propagates that far up the transport
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scope = {
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"type": "http",
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"method": "POST",
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"path": "/mcp",
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"headers": [(b"content-type", b"application/json")],
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}
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async def mock_receive():
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return {"type": "http.request", "body": b"", "more_body": False}
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# Trigger session creation
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with patch("mcp.server.streamable_http_manager.serve_loop", mock_serve):
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await manager.handle_request(scope, mock_receive, mock_send)
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session_id = None
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for msg in sent_messages: # pragma: no branch
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if msg["type"] == "http.response.start": # pragma: no branch
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for header_name, header_value in msg.get("headers", []): # pragma: no branch
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if header_name.decode().lower() == MCP_SESSION_ID_HEADER.lower():
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session_id = header_value.decode()
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break
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if session_id: # Break outer loop if session_id is found # pragma: no branch
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break
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assert session_id is not None, "Session ID not found in response headers"
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mock_serve.assert_called_once()
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# Give other tasks a chance to run to ensure the finally block executes
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await anyio.sleep(0.01)
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assert session_id not in manager._server_instances, (
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"Session ID should be removed from _server_instances after an exception"
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)
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assert not manager._server_instances, "No sessions should be tracked after the only session crashes"
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@pytest.mark.anyio
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async def test_stateless_requests_memory_cleanup():
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"""Test that stateless requests actually clean up resources using real transports."""
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app = Server("test-stateless-real-cleanup")
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manager = StreamableHTTPSessionManager(app=app, stateless=True)
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# Track created transport instances
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created_transports: list[StreamableHTTPServerTransport] = []
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# Patch StreamableHTTPServerTransport constructor to track instances
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original_constructor = StreamableHTTPServerTransport
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def track_transport(*args: Any, **kwargs: Any) -> StreamableHTTPServerTransport:
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transport = original_constructor(*args, **kwargs)
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created_transports.append(transport)
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return transport
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with patch.object(streamable_http_manager, "StreamableHTTPServerTransport", side_effect=track_transport):
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async with manager.run():
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# Send a simple request
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sent_messages: list[Message] = []
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async def mock_send(message: Message):
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sent_messages.append(message)
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scope = {
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"type": "http",
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"method": "POST",
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"path": "/mcp",
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"headers": [
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(b"content-type", b"application/json"),
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(b"accept", b"application/json, text/event-stream"),
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],
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}
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# Empty body to trigger early return
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async def mock_receive():
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return {
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"type": "http.request",
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"body": b"",
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"more_body": False,
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}
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# Send a request
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await manager.handle_request(scope, mock_receive, mock_send)
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# Verify transport was created
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assert len(created_transports) == 1, "Should have created one transport"
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transport = created_transports[0]
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# The key assertion - transport should be terminated
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assert transport._terminated, "Transport should be terminated after stateless request"
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# Verify internal state is cleaned up
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assert len(transport._request_streams) == 0, "Transport should have no active request streams"
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@pytest.mark.anyio
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async def test_unknown_session_id_returns_404(caplog: pytest.LogCaptureFixture):
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"""Test that requests with unknown session IDs return HTTP 404 per MCP spec."""
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app = Server("test-unknown-session")
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manager = StreamableHTTPSessionManager(app=app)
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async with manager.run():
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sent_messages: list[Message] = []
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response_body = b""
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async def mock_send(message: Message):
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nonlocal response_body
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sent_messages.append(message)
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if message["type"] == "http.response.body":
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response_body += message.get("body", b"")
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# Request with a non-existent session ID
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scope = {
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"type": "http",
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"method": "POST",
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"path": "/mcp",
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"headers": [
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(b"content-type", b"application/json"),
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(b"accept", b"application/json, text/event-stream"),
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(b"mcp-session-id", b"non-existent-session-id"),
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],
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}
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async def mock_receive():
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return {"type": "http.request", "body": b"{}", "more_body": False}
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with caplog.at_level(logging.INFO):
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await manager.handle_request(scope, mock_receive, mock_send)
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# Find the response start message
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response_start = next(
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(msg for msg in sent_messages if msg["type"] == "http.response.start"),
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None,
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)
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assert response_start is not None, "Should have sent a response"
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assert response_start["status"] == 404, "Should return HTTP 404 for unknown session ID"
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# Verify JSON-RPC error format
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error_data = json.loads(response_body)
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assert error_data["jsonrpc"] == "2.0"
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assert error_data["id"] is None
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assert error_data["error"]["code"] == INVALID_REQUEST
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assert error_data["error"]["message"] == "Session not found"
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assert "Rejected request with unknown or expired session ID: non-existent-session-id" in caplog.text
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@pytest.mark.anyio
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async def test_e2e_streamable_http_server_cleanup():
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host = "testserver"
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async def handle_list_tools(ctx: ServerRequestContext, params: PaginatedRequestParams | None) -> ListToolsResult:
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return ListToolsResult(tools=[])
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app = Server("test-server", on_list_tools=handle_list_tools)
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mcp_app = app.streamable_http_app(host=host)
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async with (
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mcp_app.router.lifespan_context(mcp_app),
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httpx2.ASGITransport(mcp_app) as transport,
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httpx2.AsyncClient(transport=transport) as http_client,
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Client(streamable_http_client(f"http://{host}/mcp", http_client=http_client), mode="legacy") as client,
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):
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await client.list_tools()
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class _IdleTimeoutObserver(logging.Handler):
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"""Resolves `reaped` when the manager logs that a session's idle timeout fired."""
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def __init__(self) -> None:
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super().__init__()
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self.reaped = anyio.Event()
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def emit(self, record: logging.LogRecord) -> None:
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if "idle timeout" in record.getMessage():
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self.reaped.set()
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@pytest.mark.anyio
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async def test_idle_session_is_reaped(caplog: pytest.LogCaptureFixture, request: pytest.FixtureRequest):
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"""After idle timeout fires, the session returns 404."""
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app = Server("test-idle-reap")
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manager = StreamableHTTPSessionManager(app=app, session_idle_timeout=0.05)
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# The reap is observed through the manager's own "idle timeout" log record: the manager pops
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# the session synchronously after emitting it, before its next await, so a waiter woken by
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# the record always finds the session gone. caplog.set_level enables INFO so it is created.
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observer = _IdleTimeoutObserver()
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manager_logger = logging.getLogger(streamable_http_manager.__name__)
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manager_logger.addHandler(observer)
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request.addfinalizer(lambda: manager_logger.removeHandler(observer))
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caplog.set_level(logging.INFO, logger=streamable_http_manager.__name__)
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async with manager.run():
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sent_messages: list[Message] = []
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async def mock_send(message: Message):
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sent_messages.append(message)
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scope = {
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"type": "http",
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"method": "POST",
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"path": "/mcp",
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"headers": [(b"content-type", b"application/json")],
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}
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async def mock_receive():
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return {"type": "http.request", "body": b"", "more_body": False}
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await manager.handle_request(scope, mock_receive, mock_send)
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session_id = None
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for msg in sent_messages: # pragma: no branch
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if msg["type"] == "http.response.start": # pragma: no branch
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for header_name, header_value in msg.get("headers", []): # pragma: no branch
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if header_name.decode().lower() == MCP_SESSION_ID_HEADER.lower():
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session_id = header_value.decode()
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break
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if session_id: # pragma: no branch
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break
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assert session_id is not None, "Session ID not found in response headers"
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# Wait for the 50ms idle timeout to fire and the session to be unregistered. Re-requesting
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# the session to poll for the 404 would push its idle deadline forward and keep it alive.
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with anyio.fail_after(5):
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await observer.reaped.wait()
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# Verify via public API: old session ID now returns 404
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response_messages: list[Message] = []
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async def capture_send(message: Message):
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response_messages.append(message)
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scope_with_session = {
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"type": "http",
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"method": "POST",
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"path": "/mcp",
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"headers": [
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(b"content-type", b"application/json"),
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(b"mcp-session-id", session_id.encode()),
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|
],
|
|
}
|
|
|
|
await manager.handle_request(scope_with_session, mock_receive, capture_send)
|
|
|
|
response_start = next(
|
|
(msg for msg in response_messages if msg["type"] == "http.response.start"),
|
|
None,
|
|
)
|
|
assert response_start is not None
|
|
assert response_start["status"] == 404
|
|
|
|
|
|
def test_session_idle_timeout_rejects_non_positive():
|
|
with pytest.raises(ValueError, match="positive number"):
|
|
StreamableHTTPSessionManager(app=Server("test"), session_idle_timeout=-1)
|
|
with pytest.raises(ValueError, match="positive number"):
|
|
StreamableHTTPSessionManager(app=Server("test"), session_idle_timeout=0)
|
|
|
|
|
|
def test_session_idle_timeout_rejects_stateless():
|
|
with pytest.raises(RuntimeError, match="not supported in stateless"):
|
|
StreamableHTTPSessionManager(app=Server("test"), session_idle_timeout=30, stateless=True)
|
|
|
|
|
|
def _user(client_id: str, subject: str | None = None, issuer: str | None = None) -> AuthenticatedUser:
|
|
"""Build the scope["user"] value that AuthenticationMiddleware would set for this principal."""
|
|
claims = {"iss": issuer} if issuer is not None else None
|
|
return AuthenticatedUser(AccessToken(token="token", client_id=client_id, scopes=[], subject=subject, claims=claims))
|
|
|
|
|
|
def _request_scope(
|
|
*, session_id: str | None = None, user: AuthenticatedUser | None = None, method: str = "POST"
|
|
) -> Scope:
|
|
"""Build an ASGI scope for a request to the MCP endpoint."""
|
|
headers = [
|
|
(b"content-type", b"application/json"),
|
|
(b"accept", b"application/json, text/event-stream"),
|
|
]
|
|
if session_id is not None:
|
|
headers.append((b"mcp-session-id", session_id.encode()))
|
|
scope: Scope = {
|
|
"type": "http",
|
|
"method": method,
|
|
"path": "/mcp",
|
|
"headers": headers,
|
|
}
|
|
if user is not None:
|
|
scope["user"] = user
|
|
return scope
|
|
|
|
|
|
async def _open_session(manager: StreamableHTTPSessionManager, user: AuthenticatedUser | None) -> str:
|
|
"""Create a new session as `user` and return its session ID."""
|
|
sent_messages: list[Message] = []
|
|
|
|
async def mock_send(message: Message) -> None:
|
|
sent_messages.append(message)
|
|
|
|
async def mock_receive() -> Message:
|
|
return {"type": "http.request", "body": b"", "more_body": False}
|
|
|
|
await manager.handle_request(_request_scope(user=user), mock_receive, mock_send)
|
|
|
|
response_start = next(msg for msg in sent_messages if msg["type"] == "http.response.start")
|
|
headers = dict(response_start.get("headers", []))
|
|
return headers[MCP_SESSION_ID_HEADER.encode()].decode()
|
|
|
|
|
|
async def _request_session(
|
|
manager: StreamableHTTPSessionManager, session_id: str, user: AuthenticatedUser | None, method: str = "POST"
|
|
) -> int:
|
|
"""Send a request for an existing session as `user` and return the response status."""
|
|
sent_messages: list[Message] = []
|
|
|
|
async def mock_send(message: Message) -> None:
|
|
sent_messages.append(message)
|
|
|
|
async def mock_receive() -> Message:
|
|
return {"type": "http.request", "body": b"", "more_body": False}
|
|
|
|
await manager.handle_request(
|
|
_request_scope(session_id=session_id, user=user, method=method), mock_receive, mock_send
|
|
)
|
|
|
|
response_start = next(msg for msg in sent_messages if msg["type"] == "http.response.start")
|
|
return response_start["status"]
|
|
|
|
|
|
@pytest.fixture
|
|
async def manager_with_live_session():
|
|
"""A running manager around a real `Server`. Sessions remain registered until
|
|
`manager.run()` exits because `Server.run` blocks waiting for an initialize message."""
|
|
manager = StreamableHTTPSessionManager(app=Server("test-session-credentials"))
|
|
async with manager.run():
|
|
yield manager
|
|
|
|
|
|
@pytest.mark.anyio
|
|
async def test_session_accepts_requests_from_the_credential_that_created_it(
|
|
manager_with_live_session: StreamableHTTPSessionManager,
|
|
) -> None:
|
|
"""Requests presenting the same credential as the one that created the session are served."""
|
|
manager = manager_with_live_session
|
|
session_id = await _open_session(manager, _user("client-a"))
|
|
|
|
status = await _request_session(manager, session_id, _user("client-a"))
|
|
|
|
# The request passes the manager's credential check and reaches the
|
|
# session's transport, instead of being answered with 404 by the manager.
|
|
assert status != 404
|
|
|
|
|
|
@pytest.mark.anyio
|
|
@pytest.mark.parametrize("method", ["POST", "GET", "DELETE"])
|
|
async def test_session_rejects_requests_from_a_different_credential(
|
|
manager_with_live_session: StreamableHTTPSessionManager, method: str
|
|
) -> None:
|
|
"""A session created by one credential cannot be used with another credential, whatever the method."""
|
|
manager = manager_with_live_session
|
|
session_id = await _open_session(manager, _user("client-a"))
|
|
|
|
assert await _request_session(manager, session_id, _user("client-b"), method) == 404
|
|
# The session is still registered and still serves its creator.
|
|
assert await _request_session(manager, session_id, _user("client-a")) != 404
|
|
|
|
|
|
@pytest.mark.anyio
|
|
async def test_session_rejects_requests_from_a_different_subject_of_the_same_client(
|
|
manager_with_live_session: StreamableHTTPSessionManager,
|
|
) -> None:
|
|
"""Two end-users that share an OAuth client cannot use each other's sessions."""
|
|
manager = manager_with_live_session
|
|
session_id = await _open_session(manager, _user("client-a", subject="alice"))
|
|
|
|
assert await _request_session(manager, session_id, _user("client-a", subject="bob")) == 404
|
|
assert await _request_session(manager, session_id, _user("client-a", subject=None)) == 404
|
|
assert await _request_session(manager, session_id, _user("client-a", subject="alice")) != 404
|
|
|
|
|
|
@pytest.mark.anyio
|
|
async def test_session_rejects_requests_with_the_same_subject_from_a_different_issuer(
|
|
manager_with_live_session: StreamableHTTPSessionManager,
|
|
) -> None:
|
|
"""A subject is unique only per issuer, so a colliding subject from a different issuer is not the same principal."""
|
|
manager = manager_with_live_session
|
|
creator = _user("client-a", subject="alice", issuer="https://issuer.one")
|
|
session_id = await _open_session(manager, creator)
|
|
|
|
other_issuer = _user("client-a", subject="alice", issuer="https://issuer.two")
|
|
assert await _request_session(manager, session_id, other_issuer) == 404
|
|
assert await _request_session(manager, session_id, _user("client-a", subject="alice")) == 404
|
|
assert await _request_session(manager, session_id, creator) != 404
|
|
|
|
|
|
@pytest.mark.anyio
|
|
async def test_session_rejects_unauthenticated_requests_for_an_authenticated_session(
|
|
manager_with_live_session: StreamableHTTPSessionManager,
|
|
) -> None:
|
|
"""A session created with a credential cannot be used without one."""
|
|
manager = manager_with_live_session
|
|
session_id = await _open_session(manager, _user("client-a"))
|
|
|
|
assert await _request_session(manager, session_id, None) == 404
|
|
|
|
|
|
@pytest.mark.anyio
|
|
async def test_session_rejects_authenticated_requests_for_an_anonymous_session(
|
|
manager_with_live_session: StreamableHTTPSessionManager,
|
|
) -> None:
|
|
"""A session created without a credential cannot be used with one."""
|
|
manager = manager_with_live_session
|
|
session_id = await _open_session(manager, None)
|
|
|
|
assert await _request_session(manager, session_id, _user("client-a")) == 404
|
|
|
|
|
|
@pytest.mark.anyio
|
|
async def test_anonymous_session_accepts_anonymous_requests(
|
|
manager_with_live_session: StreamableHTTPSessionManager,
|
|
) -> None:
|
|
"""Servers without authentication keep working: no credential on either side."""
|
|
manager = manager_with_live_session
|
|
session_id = await _open_session(manager, None)
|
|
|
|
assert await _request_session(manager, session_id, None) != 404
|