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import itertools
import time
from threading import Barrier, Thread
from loguru import logger
class NonSafeSink:
def __init__(self, sleep_time, stop_time=0):
self.sleep_time = sleep_time
self.stop_time = stop_time
self.written = ""
self.stopped = False
def write(self, message):
if self.stopped:
raise RuntimeError("Can't write on stopped sink")
length = len(message)
self.written += message[:length]
time.sleep(self.sleep_time)
self.written += message[length:]
def stop(self):
time.sleep(self.stop_time)
self.stopped = True
def test_safe_logging():
barrier = Barrier(2)
counter = itertools.count()
sink = NonSafeSink(1)
logger.add(sink, format="{message}", catch=False)
def threaded():
barrier.wait()
logger.info("___{}___", next(counter))
threads = [Thread(target=threaded) for _ in range(2)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
logger.remove()
assert sink.written in ("___0___\n___1___\n", "___1___\n___0___\n")
def test_safe_adding_while_logging(writer):
barrier = Barrier(2)
counter = itertools.count()
sink_1 = NonSafeSink(1)
sink_2 = NonSafeSink(1)
logger.add(sink_1, format="{message}", catch=False)
def thread_1():
barrier.wait()
logger.info("aaa{}bbb", next(counter))
def thread_2():
barrier.wait()
time.sleep(0.5)
logger.add(sink_2, format="{message}", catch=False)
logger.info("ccc{}ddd", next(counter))
threads = [Thread(target=thread_1), Thread(target=thread_2)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
logger.remove()
assert sink_1.written == "aaa0bbb\nccc1ddd\n"
assert sink_2.written == "ccc1ddd\n"
def test_safe_removing_while_logging(capsys):
barrier = Barrier(2)
counter = itertools.count()
sink = NonSafeSink(1)
i = logger.add(sink, format="{message}", catch=False)
def thread_1():
barrier.wait()
logger.info("aaa{}bbb", next(counter))
def thread_2():
barrier.wait()
time.sleep(0.5)
logger.remove(i)
logger.info("ccc{}ddd", next(counter))
threads = [Thread(target=thread_1), Thread(target=thread_2)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
out, err = capsys.readouterr()
assert out == ""
assert err == ""
assert sink.written == "aaa0bbb\n"
def test_safe_removing_all_while_logging(capsys):
barrier = Barrier(2)
for _ in range(1000):
logger.add(lambda _: None, format="{message}", catch=False)
def thread_1():
barrier.wait()
logger.remove()
def thread_2():
barrier.wait()
for _ in range(100):
logger.info("Some message")
threads = [Thread(target=thread_1), Thread(target=thread_2)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
out, err = capsys.readouterr()
assert out == ""
assert err == ""
def test_safe_slow_removing_all_while_logging(capsys):
barrier = Barrier(2)
for _ in range(10):
sink = NonSafeSink(0.1, 0.1)
logger.add(sink, format="{message}", catch=False)
def thread_1():
barrier.wait()
logger.remove()
def thread_2():
barrier.wait()
time.sleep(0.5)
logger.info("Some message")
threads = [Thread(target=thread_1), Thread(target=thread_2)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
out, err = capsys.readouterr()
assert out == ""
assert err == ""
def test_safe_writing_after_removing(capsys):
barrier = Barrier(2)
logger.add(NonSafeSink(1), format="{message}", catch=False)
i = logger.add(NonSafeSink(1), format="{message}", catch=False)
def write():
barrier.wait()
logger.info("Writing")
def remove():
barrier.wait()
time.sleep(0.5)
logger.remove(i)
threads = [Thread(target=write), Thread(target=remove)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
logger.remove()
out, err = capsys.readouterr()
assert out == ""
assert err == ""
def test_heavily_threaded_logging(capsys):
logger.remove()
def function():
i = logger.add(NonSafeSink(0.1), format="{message}", catch=False)
logger.debug("AAA")
logger.info("BBB")
logger.success("CCC")
logger.remove(i)
threads = [Thread(target=function) for _ in range(10)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
logger.remove()
out, err = capsys.readouterr()
assert out == ""
assert err == ""
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