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test_server.py
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from ctypes import c_char
import gc
import logging
import pytest
import unittest
from threading import Thread
from unittest import mock
from snap7.error import server_errors, error_text
from snap7.server import Server
from snap7.type import SrvEvent, mkEvent, mkLog, SrvArea, Parameter
logging.basicConfig(level=logging.WARNING)
@pytest.mark.server
class TestServer(unittest.TestCase):
def setUp(self) -> None:
self.server = Server()
self.server.start(tcp_port=1102)
def tearDown(self) -> None:
self.server.stop()
self.server.destroy()
def test_register_area(self) -> None:
db1_type = c_char * 1024
self.server.register_area(SrvArea.DB, 3, db1_type())
def test_error(self) -> None:
for error in server_errors:
error_text(error, context="client")
def test_event(self) -> None:
event = SrvEvent()
self.server.event_text(event)
def test_get_status(self) -> None:
server, cpu, num_clients = self.server.get_status()
def test_get_mask(self) -> None:
self.server.get_mask(mkEvent)
self.server.get_mask(mkLog)
# invalid kind
self.assertRaises(Exception, self.server.get_mask, 3)
def test_lock_area(self) -> None:
area = SrvArea.DB
index = 1
db1_type = c_char * 1024
# we need to register first
self.server.register_area(area, index, db1_type())
self.server.lock_area(area=area, index=index)
def second_locker() -> None:
self.server.lock_area(area=area, index=index)
self.server.unlock_area(area=area, index=index)
thread = Thread(target=second_locker)
thread.daemon = True
thread.start()
thread.join(timeout=1)
self.assertTrue(thread.is_alive())
self.server.unlock_area(area=area, index=index)
thread.join(timeout=1)
self.assertFalse(thread.is_alive())
def test_set_cpu_status(self) -> None:
self.server.set_cpu_status(0)
self.server.set_cpu_status(4)
self.server.set_cpu_status(8)
self.assertRaises(ValueError, self.server.set_cpu_status, -1)
def test_set_mask(self) -> None:
self.server.set_mask(kind=mkEvent, mask=10)
def test_unlock_area(self) -> None:
area_code = SrvArea.DB
index = 1
db1_type = c_char * 1024
# we need to register first
self.assertRaises(Exception, self.server.lock_area, area_code, index)
self.server.register_area(area_code, index, db1_type())
self.server.lock_area(area_code, index)
self.server.unlock_area(area_code, index)
def test_unregister_area(self) -> None:
area_code = SrvArea.DB
index = 1
db1_type = c_char * 1024
self.server.register_area(area_code, index, db1_type())
self.server.unregister_area(area_code, index)
def test_events_callback(self) -> None:
def event_call_back(event: str) -> None:
logging.debug(event)
self.server.set_events_callback(event_call_back)
def test_read_events_callback(self) -> None:
def read_events_call_back(event: str) -> None:
logging.debug(event)
self.server.set_read_events_callback(read_events_call_back)
def test_pick_event(self) -> None:
event = self.server.pick_event()
self.assertEqual(type(event), SrvEvent)
event = self.server.pick_event()
self.assertFalse(event)
def test_clear_events(self) -> None:
self.server.clear_events()
self.assertFalse(self.server.clear_events())
def test_start_to(self) -> None:
self.server.start_to("0.0.0.0") # noqa: S104
self.assertRaises(ValueError, self.server.start_to, "bogus")
def test_get_param(self) -> None:
# check the defaults
self.assertEqual(self.server.get_param(Parameter.LocalPort), 1102)
self.assertEqual(self.server.get_param(Parameter.WorkInterval), 100)
self.assertEqual(self.server.get_param(Parameter.MaxClients), 1024)
# invalid param for server
self.assertRaises(Exception, self.server.get_param, Parameter.RemotePort)
@pytest.mark.server
class TestServerBeforeStart(unittest.TestCase):
"""
Tests for server before it is started
"""
def setUp(self) -> None:
self.server = Server()
def test_set_param(self) -> None:
self.server.set_param(Parameter.LocalPort, 1102)
@pytest.mark.server
class TestLibraryIntegration(unittest.TestCase):
def setUp(self) -> None:
# replace the function load_library with a mock
self.loadlib_patch = mock.patch("snap7.server.load_library")
self.loadlib_func = self.loadlib_patch.start()
# have load_library return another mock
self.mocklib = mock.MagicMock()
self.loadlib_func.return_value = self.mocklib
# have the Srv_Create of the mock return None
self.mocklib.Srv_Create.return_value = None
self.mocklib.Srv_Destroy.return_value = None
def tearDown(self) -> None:
# restore load_library
self.loadlib_patch.stop()
def test_create(self) -> None:
server = Server(log=False)
del server
gc.collect()
self.mocklib.Srv_Create.assert_called_once()
def test_context_manager(self) -> None:
with Server(log=False) as _:
pass
if __name__ == "__main__":
import logging
logging.basicConfig()
unittest.main()