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import multiprocessing
import unittest
from unittest.mock import Mock, mock_open, patch
import psutil
from patroni.postgresql.postmaster import PostmasterProcess
class MockProcess:
def __init__(self, target, args):
self.target = target
self.args = args
def start(self):
self.target(*self.args)
def join(self):
pass
class TestPostmasterProcess(unittest.TestCase):
@patch('psutil.Process.__init__', Mock())
def test_init(self):
proc = PostmasterProcess(-123)
self.assertTrue(proc.is_single_user)
@patch('psutil.Process.create_time')
@patch('psutil.Process.__init__')
@patch.object(PostmasterProcess, '_read_postmaster_pidfile')
def test_from_pidfile(self, mock_read, mock_init, mock_create_time):
mock_init.side_effect = psutil.NoSuchProcess(123)
mock_read.return_value = {}
self.assertIsNone(PostmasterProcess.from_pidfile(''))
mock_read.return_value = {"pid": "foo"}
self.assertIsNone(PostmasterProcess.from_pidfile(''))
mock_read.return_value = {"pid": "123"}
self.assertIsNone(PostmasterProcess.from_pidfile(''))
mock_init.side_effect = None
with patch.object(psutil.Process, 'pid', 123), \
patch.object(psutil.Process, 'ppid', return_value=124), \
patch('os.getpid', return_value=125) as mock_ospid, \
patch('os.getppid', return_value=126):
self.assertIsNotNone(PostmasterProcess.from_pidfile(''))
mock_create_time.return_value = 100000
mock_read.return_value = {"pid": "123", "start_time": "200000"}
self.assertIsNone(PostmasterProcess.from_pidfile(''))
mock_read.return_value = {"pid": "123", "start_time": "foobar"}
self.assertIsNotNone(PostmasterProcess.from_pidfile(''))
mock_ospid.return_value = 123
mock_read.return_value = {"pid": "123", "start_time": "100000"}
self.assertIsNone(PostmasterProcess.from_pidfile(''))
@patch('psutil.Process.__init__')
def test_from_pid(self, mock_init):
mock_init.side_effect = psutil.NoSuchProcess(123)
self.assertEqual(PostmasterProcess.from_pid(123), None)
mock_init.side_effect = None
self.assertNotEqual(PostmasterProcess.from_pid(123), None)
@patch('psutil.Process.__init__', Mock())
@patch('psutil.wait_procs', Mock())
@patch('psutil.Process.suspend')
@patch('psutil.Process.children')
@patch('psutil.Process.kill')
def test_signal_kill(self, mock_kill, mock_children, mock_suspend):
proc = PostmasterProcess(123)
# all processes successfully stopped
mock_children.return_value = [Mock()]
mock_children.return_value[0].kill.side_effect = psutil.NoSuchProcess(123)
self.assertTrue(proc.signal_kill())
# postmaster has gone before suspend
mock_suspend.side_effect = psutil.NoSuchProcess(123)
self.assertTrue(proc.signal_kill())
# postmaster has gone before we got a list of children
mock_suspend.side_effect = psutil.AccessDenied()
mock_children.side_effect = psutil.NoSuchProcess(123)
self.assertTrue(proc.signal_kill())
# postmaster has gone after we got a list of children
mock_children.side_effect = psutil.AccessDenied()
mock_kill.side_effect = psutil.NoSuchProcess(123)
self.assertTrue(proc.signal_kill())
# failed to kill postmaster
mock_kill.side_effect = psutil.AccessDenied()
self.assertFalse(proc.signal_kill())
@patch('psutil.Process.__init__', Mock())
@patch('psutil.Process.send_signal')
@patch('psutil.Process.pid', Mock(return_value=123))
@patch('os.name', 'posix')
@patch('signal.SIGQUIT', 3, create=True)
def test_signal_stop(self, mock_send_signal):
proc = PostmasterProcess(-123)
self.assertEqual(proc.signal_stop('immediate'), False)
mock_send_signal.side_effect = [None, psutil.NoSuchProcess(123), psutil.AccessDenied()]
proc = PostmasterProcess(123)
self.assertEqual(proc.signal_stop('immediate'), None)
self.assertEqual(proc.signal_stop('immediate'), True)
self.assertEqual(proc.signal_stop('immediate'), False)
@patch('psutil.Process.__init__', Mock())
@patch('patroni.postgresql.postmaster.os')
@patch('subprocess.call', Mock(side_effect=[0, OSError, 1]))
@patch('psutil.Process.pid', Mock(return_value=123))
@patch('psutil.Process.is_running', Mock(return_value=False))
def test_signal_stop_nt(self, mock_os):
mock_os.configure_mock(name="nt")
proc = PostmasterProcess(-123)
self.assertEqual(proc.signal_stop('immediate'), False)
proc = PostmasterProcess(123)
self.assertEqual(proc.signal_stop('immediate'), None)
self.assertEqual(proc.signal_stop('immediate'), False)
self.assertEqual(proc.signal_stop('immediate'), True)
@patch('psutil.Process.__init__', Mock())
@patch('psutil.wait_procs')
def test_wait_for_user_backends_to_close(self, mock_wait):
c1 = Mock()
c1.cmdline = Mock(return_value=["postgres: startup process "])
c2 = Mock()
c2.cmdline = Mock(return_value=["postgres: postgres postgres [local] idle"])
c3 = Mock()
c3.cmdline = Mock(side_effect=psutil.NoSuchProcess(123))
c4 = Mock()
c4.cmdline = Mock(return_value=['postgres: slotsync worker '])
mock_wait.return_value = ([], [c2])
with patch('psutil.Process.children', Mock(return_value=[c1, c2, c3, c4])):
proc = PostmasterProcess(123)
self.assertIsNone(proc.wait_for_user_backends_to_close(1))
mock_wait.assert_called_with([c2], 1)
mock_wait.return_value = ([c2], [])
with patch('psutil.Process.children', Mock(return_value=[c1, c2, c3, c4])):
proc = PostmasterProcess(123)
proc.wait_for_user_backends_to_close(1)
with patch('psutil.Process.children', Mock(side_effect=psutil.NoSuchProcess(123))):
proc = PostmasterProcess(123)
self.assertIsNone(proc.wait_for_user_backends_to_close(None))
@patch('subprocess.Popen')
@patch('os.setsid', Mock(), create=True)
@patch('multiprocessing.Process', MockProcess)
@patch('multiprocessing.get_context', Mock(return_value=multiprocessing), create=True)
@patch.object(PostmasterProcess, 'from_pid')
@patch.object(PostmasterProcess, '_from_pidfile')
def test_start(self, mock_frompidfile, mock_frompid, mock_popen):
mock_frompidfile.return_value._is_postmaster_process.return_value = False
mock_frompid.return_value = "proc 123"
mock_popen.return_value.pid = 123
self.assertEqual(PostmasterProcess.start('true', '/tmp', '/tmp/test.conf', []), "proc 123")
mock_frompid.assert_called_with(123)
mock_frompidfile.side_effect = psutil.NoSuchProcess(123)
self.assertEqual(PostmasterProcess.start('true', '/tmp', '/tmp/test.conf', []), "proc 123")
mock_popen.side_effect = Exception
self.assertIsNone(PostmasterProcess.start('true', '/tmp', '/tmp/test.conf', []))
@patch('psutil.Process.__init__', Mock(side_effect=psutil.NoSuchProcess(123)))
def test_read_postmaster_pidfile(self):
with patch('builtins.open', Mock(side_effect=IOError)):
self.assertIsNone(PostmasterProcess.from_pidfile(''))
with patch('builtins.open', mock_open(read_data='123\n')):
self.assertIsNone(PostmasterProcess.from_pidfile(''))
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