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# Copyright (C) 2016. BMW Car IT GmbH. All rights reserved.
from multiprocessing import Queue as mp_queue
from queue import Empty, Queue
import time
import unittest
from dlt.dlt_broker_handlers import DLTContextHandler
from tests.utils import create_messages, stream_one, stream_multiple
class TestDLTContextHandler(unittest.TestCase):
def setUp(self):
self.filter_queue = mp_queue()
self.message_queue = mp_queue()
self.handler = DLTContextHandler(self.filter_queue, self.message_queue)
def test_init(self):
self.assertFalse(self.handler.stop_flag.is_set())
self.assertFalse(self.handler.is_alive())
self.assertTrue(self.handler.filter_queue.empty())
self.assertTrue(self.handler.message_queue.empty())
def test_register_no_filter(self):
queue = Queue()
queue_id = id(queue)
self.handler.register(queue)
# When no filter is specified, filter (None, None) should be
# added (ie: match all messages)
self.assertIn(queue_id, self.handler.context_map)
self.assertEqual(self.handler.context_map[queue_id], (queue, [(None, None)]))
self.assertEqual(self.handler.filter_queue.get(), (queue_id, [(None, None)], True))
def test_register_single_filter(self):
queue = Queue()
queue_id = id(queue)
filters = ("SYS", "JOUR")
self.handler.register(queue, filters)
# Specified, filter should be added to filter_queue
self.assertIn(queue_id, self.handler.context_map)
self.assertEqual(self.handler.context_map[queue_id], (queue, filters))
self.assertEqual(self.handler.filter_queue.get(), (queue_id, filters, True))
def test_register_similar_filters(self):
queue0 = Queue()
queue_id0 = id(queue0)
filters0 = ("SYS", "JOUR")
queue1 = Queue()
queue_id1 = id(queue1)
filters1 = ("SYS", "JOUR")
self.handler.register(queue0, filters0)
self.handler.register(queue1, filters1)
# Each queue should have a unique entry in the context_map and
# filter_queue (even if they have the same filter)
self.assertIn(queue_id0, self.handler.context_map)
self.assertIn(queue_id1, self.handler.context_map)
self.assertEqual(self.handler.context_map[queue_id0], (queue0, filters0))
self.assertEqual(self.handler.context_map[queue_id1], (queue1, filters1))
self.assertEqual(self.handler.filter_queue.get(), (queue_id0, filters0, True))
self.assertEqual(self.handler.filter_queue.get(), (queue_id1, filters1, True))
def test_unregister(self):
queue = Queue()
queue_id = id(queue)
filters = ("SYS", "JOUR")
self.handler.register(queue, filters)
self.assertIn(queue_id, self.handler.context_map)
self.assertEqual(self.handler.filter_queue.get(), (queue_id, filters, True))
self.handler.unregister(queue)
self.assertNotIn(queue_id, self.handler.context_map)
self.assertEqual(self.handler.filter_queue.get(), (queue_id, filters, False))
def test_run_no_messages(self):
try:
self.handler.start()
time.sleep(0.2)
self.handler.stop()
self.assertTrue(self.handler.stop_flag.is_set())
self.assertFalse(self.handler.is_alive())
except: # noqa: E722
self.fail()
def test_run_single_context_queue(self):
queue = Queue()
queue_id = id(queue)
filters = ("DA1", "DC1")
self.handler.register(queue, filters)
self.handler.start()
# - simulate feeding of messages into the message_queue
for _ in range(10):
self.handler.message_queue.put((queue_id, create_messages(stream_one)))
try:
for _ in range(10):
queue.get(timeout=0.01)
except Empty:
# - we should not get an Empty for exactly 10 messages
self.fail()
finally:
self.handler.stop()
def test_run_multiple_context_queue(self):
self.handler.start()
queue0 = Queue()
queue_id0 = id(queue0)
filters0 = ("DA1", "DC1")
self.handler.register(queue0, filters0)
queue1 = Queue()
queue_id1 = id(queue1)
filters1 = ("SYS", "JOUR")
self.handler.register(queue1, filters1)
# - queue with no filter
queue2 = Queue()
queue_id2 = id(queue2)
self.handler.register(queue2)
# - simulate feeding of messages into the message_queue
for _ in range(10):
for message in create_messages(stream_multiple, from_file=True):
queue_id = queue_id0 if message.apid == "DA1" else queue_id1
self.handler.message_queue.put((queue_id, message))
# - simulate feeding of all messages for the queue with
# no filter.
self.handler.message_queue.put((queue_id2, message))
try:
da1_messages = []
sys_messages = []
all_messages = []
for _ in range(10):
da1_messages.append(queue0.get(timeout=0.01))
sys_messages.append(queue1.get(timeout=0.01))
all_messages.append(queue2.get(timeout=0.01))
# these queues should not get any messages from other queues
self.assertTrue(all(msg.apid == "DA1" for msg in da1_messages))
self.assertTrue(all(msg.apid == "SYS" for msg in sys_messages))
# this queues should get all messages
self.assertFalse(
all(msg.apid == "DA1" for msg in all_messages) or all(msg.apid == "SYS" for msg in all_messages)
)
except Empty:
# - we should not get an Empty for at least 10 messages
self.fail()
finally:
self.handler.stop()
def test_run_unregister_with_unread_messages(self):
self.handler.start()
queue = Queue()
queue_id = id(queue)
filters = ("DA1", "DC1")
self.handler.register(queue, filters)
self.assertIn(queue_id, self.handler.context_map)
self.handler.unregister(queue)
# - simulate feeding of messages into the message_queue
for _ in range(3):
self.handler.message_queue.put((queue_id, create_messages(stream_one)))
try:
self.assertNotIn(queue_id, self.handler.context_map)
# allow some time for the thread to read all messages
time.sleep(0.5)
self.assertTrue(self.handler.message_queue.empty())
self.assertTrue(queue.empty())
finally:
self.handler.stop()
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