test_188_concurrency.py•1.3 kB
import anyio
import pytest
from pydantic import AnyUrl
from mcp.server.fastmcp import FastMCP
from mcp.shared.memory import (
create_connected_server_and_client_session as create_session,
)
_sleep_time_seconds = 0.01
_resource_name = "slow://slow_resource"
@pytest.mark.anyio
async def test_messages_are_executed_concurrently():
server = FastMCP("test")
@server.tool("sleep")
async def sleep_tool():
await anyio.sleep(_sleep_time_seconds)
return "done"
@server.resource(_resource_name)
async def slow_resource():
await anyio.sleep(_sleep_time_seconds)
return "slow"
async with create_session(server._mcp_server) as client_session:
start_time = anyio.current_time()
async with anyio.create_task_group() as tg:
for _ in range(10):
tg.start_soon(client_session.call_tool, "sleep")
tg.start_soon(client_session.read_resource, AnyUrl(_resource_name))
end_time = anyio.current_time()
duration = end_time - start_time
assert duration < 3 * _sleep_time_seconds
print(duration)
def main():
anyio.run(test_messages_are_executed_concurrently)
if __name__ == "__main__":
import logging
logging.basicConfig(level=logging.DEBUG)
main()