baseimage-tutorial-framework/tfw/internals/networking/test_networking.py

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# pylint: disable=redefined-outer-name
from os.path import join
from secrets import token_urlsafe
from random import randint
from tempfile import TemporaryDirectory
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from contextlib import suppress
import pytest
from tornado.ioloop import IOLoop
from tfw.internals.networking import ZMQListener, ZMQConnector, Scope, Intent
@pytest.fixture
def _listener_and_connector():
with TemporaryDirectory() as tmpdir:
down_sock = join(tmpdir, 'down')
up_sock = join(tmpdir, 'up')
server_downlink = f'ipc://{down_sock}'
server_uplink = f'ipc://{up_sock}'
listener = ZMQListener(server_downlink, server_uplink)
connector = ZMQConnector(server_uplink, server_downlink)
yield listener, connector
listener.close()
connector.close()
@pytest.fixture
def zmq_listener(_listener_and_connector):
listener, _ = _listener_and_connector
yield listener
@pytest.fixture
def zmq_connector(_listener_and_connector):
_, connector = _listener_and_connector
yield connector
def run_ioloop_once():
# Hack: we have to wait for the messages to get through
# the network stack of the OS while the IOLoop is waiting
# for them via select/epoll/kqueue.
# This is an inherent race condition, but solving this
# problem properly would make the test code difficult
# to understand, so we use this half measure.
IOLoop.current().call_later(0.1, IOLoop.current().stop)
IOLoop.current().start()
@pytest.fixture
def test_messages():
random_str = lambda: token_urlsafe(randint(4, 8))
yield [
{
'key': random_str(),
random_str(): randint(8192, 16384),
random_str(): random_str(),
random_str(): {
random_str(): random_str(),
random_str(): {random_str(): random_str()}
},
random_str(): [random_str(), random_str()]
}
for _ in range(randint(8, 16))
]
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def wait_until_subscriber_connects(listener, connector):
# Warning: you are better off without comprehending how this works
# Reference: ZMQ PUB-SUB slow joiner problem
connector.subscribe('-', '_')
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# Wait until something can go through the connection
dummy = {'key': '-'}
while True:
listener.send_message(dummy)
with suppress(IOError):
if connector.recv_message(block=False) == dummy:
break
# Throw away leftover messages from last while loop
sentinel = {'key': '_'}
listener.send_message(sentinel)
while True:
with suppress(IOError):
if connector.recv_message(block=False) == sentinel:
break
connector.unsubscribe('-', '_')
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def test_server_downlink(zmq_listener, zmq_connector, test_messages):
messages = []
zmq_listener.register_callback(messages.append)
for message in test_messages:
zmq_connector.send_message(message)
run_ioloop_once()
assert messages == test_messages
def test_connector_default_scope_is_zmq(zmq_listener, zmq_connector):
messages = []
zmq_listener.register_callback(messages.append)
zmq_connector.send_message({'key': 'cica'})
run_ioloop_once()
assert messages[0]['scope'] == Scope.ZMQ.value
def test_connector_preserves_scope(zmq_listener, zmq_connector):
messages = []
zmq_listener.register_callback(messages.append)
zmq_connector.send_message({'key': 'cica', 'scope': Scope.WEBSOCKET.value})
run_ioloop_once()
assert messages[0]['scope'] == Scope.WEBSOCKET.value
def test_connector_scope_overrides_message_scope(zmq_listener, zmq_connector):
messages = []
zmq_listener.register_callback(messages.append)
zmq_connector.send_message(
{'key': 'cica', 'scope': Scope.WEBSOCKET.value},
scope=Scope.ZMQ
)
run_ioloop_once()
assert messages[0]['scope'] == Scope.ZMQ.value
def test_connector_adds_intent(zmq_listener, zmq_connector):
messages = []
zmq_listener.register_callback(messages.append)
zmq_connector.send_message(
{'key': 'cica'},
intent=Intent.EVENT
)
run_ioloop_once()
assert messages[0]['intent'] == Intent.EVENT.value
def test_connector_preserves_intent(zmq_listener, zmq_connector):
messages = []
zmq_listener.register_callback(messages.append)
zmq_connector.send_message({'key': 'cica', 'intent': Intent.EVENT.value})
run_ioloop_once()
assert messages[0]['intent'] == Intent.EVENT.value
def test_server_uplink(zmq_listener, zmq_connector, test_messages):
zmq_connector.subscribe('')
wait_until_subscriber_connects(zmq_listener, zmq_connector)
messages = []
zmq_connector.register_callback(messages.append)
for message in test_messages:
zmq_listener.send_message(message)
run_ioloop_once()
assert messages == test_messages
def test_connector_downlink_subscribe(zmq_listener, zmq_connector):
key1_messages = [{'key': '1', 'data': i} for i in range(randint(128, 256))]
key2_messages = [{'key': '2', 'data': i} for i in range(randint(128, 256))]
all_messages = key1_messages + key2_messages
zmq_connector.subscribe('1')
wait_until_subscriber_connects(zmq_listener, zmq_connector)
messages = []
zmq_connector.register_callback(messages.append)
for message in all_messages:
zmq_listener.send_message(message)
run_ioloop_once()
assert messages == key1_messages
assert all((msg not in messages for msg in key2_messages))
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def test_listener_sync_recv(zmq_listener, zmq_connector, test_messages):
for message in test_messages:
zmq_connector.send_message(message)
assert zmq_listener.recv_message() == message
def test_connector_sync_recv(zmq_listener, zmq_connector, test_messages):
zmq_connector.subscribe('')
wait_until_subscriber_connects(zmq_listener, zmq_connector)
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for message in test_messages:
zmq_listener.send_message(message)
assert zmq_connector.recv_message() == message
def test_sync_recv_raises_if_callback_is_registered(zmq_listener, zmq_connector):
zmq_listener.register_callback(lambda msg: None)
zmq_connector.register_callback(lambda msg: None)
with pytest.raises(RuntimeError):
zmq_listener.recv_message()
with pytest.raises(RuntimeError):
zmq_connector.recv_message()