mirror of
https://github.com/PrefectHQ/fastmcp.git
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112 lines
3.4 KiB
Python
112 lines
3.4 KiB
Python
"""Tests for lifespan functionality in both low-level and FastMCP servers."""
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from collections.abc import AsyncIterator
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from contextlib import asynccontextmanager
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import anyio
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from mcp.types import (
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ClientCapabilities,
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Implementation,
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InitializeRequestParams,
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JSONRPCMessage,
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JSONRPCNotification,
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JSONRPCRequest,
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)
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from pydantic import TypeAdapter
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from fastmcp import Context, FastMCP
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async def test_fastmcp_server_lifespan():
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"""Test that lifespan works in FastMCP server."""
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@asynccontextmanager
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async def test_lifespan(server: FastMCP) -> AsyncIterator[dict]:
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"""Test lifespan context that tracks startup/shutdown."""
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context = {"started": False, "shutdown": False}
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try:
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context["started"] = True
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yield context
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finally:
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context["shutdown"] = True
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server = FastMCP("test", lifespan=test_lifespan)
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# Create memory streams for testing
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send_stream1, receive_stream1 = anyio.create_memory_object_stream(100)
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send_stream2, receive_stream2 = anyio.create_memory_object_stream(100)
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# Add a tool that checks lifespan context
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@server.tool()
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def check_lifespan(ctx: Context) -> bool:
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"""Tool that checks lifespan context."""
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assert isinstance(ctx.request_context.lifespan_context, dict)
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assert ctx.request_context.lifespan_context["started"]
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assert not ctx.request_context.lifespan_context["shutdown"]
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return True
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# Run server in background task
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async with (
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anyio.create_task_group() as tg,
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send_stream1,
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receive_stream1,
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send_stream2,
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receive_stream2,
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):
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async def run_server():
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await server._mcp_server.run(
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receive_stream1,
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send_stream2,
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server._mcp_server.create_initialization_options(),
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raise_exceptions=True,
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)
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tg.start_soon(run_server)
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# Initialize the server
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params = InitializeRequestParams(
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protocolVersion="2024-11-05",
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capabilities=ClientCapabilities(),
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clientInfo=Implementation(name="test-client", version="0.1.0"),
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)
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await send_stream1.send(
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JSONRPCMessage(
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root=JSONRPCRequest(
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jsonrpc="2.0",
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id=1,
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method="initialize",
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params=TypeAdapter(InitializeRequestParams).dump_python(params),
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)
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)
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)
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response = await receive_stream2.receive()
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# Send initialized notification
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await send_stream1.send(
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JSONRPCMessage(
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root=JSONRPCNotification(
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jsonrpc="2.0",
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method="notifications/initialized",
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)
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)
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)
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# Call the tool to verify lifespan context
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await send_stream1.send(
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JSONRPCMessage(
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root=JSONRPCRequest(
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jsonrpc="2.0",
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id=2,
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method="tools/call",
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params={"name": "check_lifespan", "arguments": {}},
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)
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)
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)
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# Get response and verify
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response = await receive_stream2.receive()
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assert response.root.result["content"][0]["text"] == "true"
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# Cancel server task
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tg.cancel_scope.cancel()
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