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from threading import Lock, Thread
from unittest.mock import patch
import pytest
from tests.testutils.handshake import Handshake
class Producer(Thread):
def __init__(self, exception=None):
super().__init__(daemon=True, name="ProducerThread")
self.handshake = Handshake()
self.lock = Lock()
self.value = 0
self.exception = exception
self.error = None
def run(self):
try:
for _ in range(2):
with self.handshake(self.exception):
with self.lock:
self.action()
except Exception as err:
self.error = err
def action(self):
self.value += 1
@pytest.fixture()
def producer(request):
thread = Producer(**getattr(request, "param", {}))
yield thread
thread.join(1)
assert not thread.is_alive()
class TestSynchronization:
def test_sync(self, producer: Producer):
assert not producer.handshake.wait_ready(0), "Producer is not yet ready"
assert not producer.handshake.wait_done(0), "Producer is not done"
producer.start()
assert producer.handshake.wait_ready(1), "Producer arrived in ready-state within at most 1 second"
assert not producer.handshake.wait_done(0), "Producer is not in done-state"
assert producer.value == 0
assert producer.handshake.step(1), "Producer manages to execute one iteration within at most 1 second"
assert not producer.handshake.wait_done(0), "Producer is not in done-state after completing one iteration"
assert producer.value == 1
assert producer.handshake.wait_ready(1), "Producer once again arrived in ready-state within at most 1 second"
# make producer and consumer threads increment the value independently
producer.handshake.go()
with producer.lock:
producer.value += 1
assert producer.handshake.wait_done(1), "Producer is done after at most 1 second"
assert producer.value == 3
assert not producer.handshake.wait_done(0), "Producer is not in done-state anymore"
assert not producer.handshake.wait_ready(0), "Producer's loop ended, not waiting in ready-state again"
@pytest.mark.trio()
async def test_async(self, producer: Producer):
assert not await producer.handshake.is_ready(0), "Producer is not yet ready"
assert not await producer.handshake.is_done(0), "Producer is not done"
producer.start()
assert await producer.handshake.is_ready(1), "Producer arrived in ready-state within at most 1 second"
assert not await producer.handshake.is_done(0), "Producer is not in done-state"
assert producer.value == 0
assert await producer.handshake.asyncstep(1), "Producer manages to execute one iteration within at most 1 second"
assert not await producer.handshake.is_done(0), "Producer is not in done-state after completing one iteration"
assert producer.value == 1
assert await producer.handshake.is_ready(1), "Producer once again arrived in ready-state within at most 1 second"
# make producer and consumer threads increment the value independently
producer.handshake.go()
is_done = producer.handshake.is_done(1)
with producer.lock:
producer.value += 1
assert await is_done, "Producer is done after at most 1 second"
assert producer.value == 3
assert not await producer.handshake.is_done(0), "Producer is not in done-state anymore"
assert not await producer.handshake.is_ready(0), "Producer's loop ended, not waiting in ready-state again"
class TestNoCaptureExceptions:
def test_sync(self, producer: Producer):
producer.start()
# doesn't catch exception and doesn't raise in consumer thread
with patch.object(producer, "action", side_effect=Exception):
assert producer.handshake.step(1), "Doesn't catch any exceptions, doesn't raise in consumer thread"
producer.join(1)
assert not producer.is_alive(), "Producer thread has raised exception and has terminated"
assert isinstance(producer.error, Exception)
@pytest.mark.trio()
async def test_async(self, producer: Producer):
producer.start()
# doesn't catch exception and doesn't raise in consumer thread
with patch.object(producer, "action", side_effect=Exception):
assert await producer.handshake.asyncstep(1), "Doesn't catch any exceptions, doesn't raise in consumer thread"
producer.join(1)
assert not producer.is_alive(), "Producer thread has raised exception and has terminated"
assert isinstance(producer.error, Exception)
class TestCaptureExceptions:
@pytest.mark.parametrize("producer", [{"exception": TypeError}], indirect=True)
def test_sync(self, producer: Producer):
producer.start()
# catches exception and raises in consumer thread
with patch.object(producer, "action", side_effect=TypeError):
with pytest.raises(TypeError):
producer.handshake.step(1)
assert not producer.handshake.wait_done(0), "Producer is not in done-state anymore after catching an exception"
assert producer.handshake.wait_ready(1), "Producer once again arrived in ready-state within at most 1 second"
with patch.object(producer, "action", side_effect=ValueError):
assert producer.handshake.step(1), "Doesn't catch different exceptions, doesn't raise in consumer thread"
producer.join(1)
assert not producer.is_alive(), "Producer thread has raised exception and has terminated"
assert isinstance(producer.error, ValueError)
@pytest.mark.trio()
@pytest.mark.parametrize("producer", [{"exception": TypeError}], indirect=True)
async def test_async(self, producer: Producer):
producer.start()
# catches exception and raises in consumer thread
with patch.object(producer, "action", side_effect=TypeError):
with pytest.raises(TypeError):
await producer.handshake.asyncstep(1)
assert not await producer.handshake.is_done(0), "Producer is not in done-state anymore after catching an exception"
assert await producer.handshake.is_ready(1), "Producer once again arrived in ready-state within at most 1 second"
with patch.object(producer, "action", side_effect=ValueError):
assert await producer.handshake.asyncstep(1), "Doesn't catch different exceptions, doesn't raise in consumer thread"
producer.join(1)
assert not producer.is_alive(), "Producer thread has raised exception and has terminated"
assert isinstance(producer.error, ValueError)
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