mirror of
https://github.com/PrefectHQ/fastmcp.git
synced 2026-08-09 15:19:10 +02:00
117 lines
3.9 KiB
Python
117 lines
3.9 KiB
Python
import inspect
|
|
|
|
import pytest
|
|
|
|
from fastmcp import Client
|
|
from fastmcp.client.transports import PythonStdioTransport, StdioTransport
|
|
|
|
|
|
class TestKeepAlive:
|
|
# https://github.com/jlowin/fastmcp/issues/581
|
|
|
|
@pytest.fixture
|
|
def stdio_script(self, tmp_path):
|
|
script = inspect.cleandoc('''
|
|
import os
|
|
from fastmcp import FastMCP
|
|
|
|
mcp = FastMCP()
|
|
|
|
@mcp.tool
|
|
def pid() -> int:
|
|
"""Gets PID of server"""
|
|
return os.getpid()
|
|
|
|
if __name__ == "__main__":
|
|
mcp.run()
|
|
''')
|
|
script_file = tmp_path / "stdio.py"
|
|
script_file.write_text(script)
|
|
return script_file
|
|
|
|
async def test_keep_alive_default_true(self):
|
|
client = Client(transport=StdioTransport(command="python", args=[""]))
|
|
|
|
assert client.transport.keep_alive is True
|
|
|
|
async def test_keep_alive_set_false(self):
|
|
client = Client(
|
|
transport=StdioTransport(command="python", args=[""], keep_alive=False)
|
|
)
|
|
assert client.transport.keep_alive is False
|
|
|
|
async def test_keep_alive_maintains_session_across_multiple_calls(
|
|
self, stdio_script
|
|
):
|
|
client = Client(transport=PythonStdioTransport(script_path=stdio_script))
|
|
assert client.transport.keep_alive is True
|
|
|
|
async with client:
|
|
result1 = await client.call_tool("pid")
|
|
pid1 = int(result1[0].text) # type: ignore[attr-defined]
|
|
|
|
async with client:
|
|
result2 = await client.call_tool("pid")
|
|
pid2 = int(result2[0].text) # type: ignore[attr-defined]
|
|
|
|
assert pid1 == pid2
|
|
|
|
async def test_keep_alive_false_starts_new_session_across_multiple_calls(
|
|
self, stdio_script
|
|
):
|
|
client = Client(
|
|
transport=PythonStdioTransport(script_path=stdio_script, keep_alive=False)
|
|
)
|
|
assert client.transport.keep_alive is False
|
|
|
|
async with client:
|
|
result1 = await client.call_tool("pid")
|
|
pid1 = int(result1[0].text) # type: ignore[attr-defined]
|
|
|
|
async with client:
|
|
result2 = await client.call_tool("pid")
|
|
pid2 = int(result2[0].text) # type: ignore[attr-defined]
|
|
|
|
assert pid1 != pid2
|
|
|
|
async def test_keep_alive_starts_new_session_if_manually_closed(self, stdio_script):
|
|
client = Client(transport=PythonStdioTransport(script_path=stdio_script))
|
|
assert client.transport.keep_alive is True
|
|
|
|
async with client:
|
|
result1 = await client.call_tool("pid")
|
|
pid1 = int(result1[0].text) # type: ignore[attr-defined]
|
|
|
|
await client.close()
|
|
|
|
async with client:
|
|
result2 = await client.call_tool("pid")
|
|
pid2 = int(result2[0].text) # type: ignore[attr-defined]
|
|
|
|
assert pid1 != pid2
|
|
|
|
async def test_keep_alive_maintains_session_if_reentered(self, stdio_script):
|
|
client = Client(transport=PythonStdioTransport(script_path=stdio_script))
|
|
assert client.transport.keep_alive is True
|
|
|
|
async with client:
|
|
result1 = await client.call_tool("pid")
|
|
pid1 = int(result1[0].text) # type: ignore[attr-defined]
|
|
|
|
async with client:
|
|
result2 = await client.call_tool("pid")
|
|
pid2 = int(result2[0].text) # type: ignore[attr-defined]
|
|
|
|
result3 = await client.call_tool("pid")
|
|
pid3 = int(result3[0].text) # type: ignore[attr-defined]
|
|
|
|
assert pid1 == pid2 == pid3
|
|
|
|
async def test_close_session_and_try_to_use_client_raises_error(self, stdio_script):
|
|
client = Client(transport=PythonStdioTransport(script_path=stdio_script))
|
|
assert client.transport.keep_alive is True
|
|
|
|
async with client:
|
|
await client.close()
|
|
with pytest.raises(RuntimeError, match="Client is not connected"):
|
|
await client.call_tool("pid")
|