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import asyncio
import sys
import threading
from unittest.mock import MagicMock
import pytest
from loguru import logger
from loguru._contextvars import load_contextvar_class
def test_contextualize(writer):
logger.add(writer, format="{message} {extra[foo]} {extra[baz]}")
with logger.contextualize(foo="bar", baz=123):
logger.info("Contextualized")
assert writer.read() == "Contextualized bar 123\n"
def test_contextualize_as_decorator(writer):
logger.add(writer, format="{message} {extra[foo]} {extra[baz]}")
@logger.contextualize(foo=123, baz="bar")
def task():
logger.info("Contextualized")
task()
assert writer.read() == "Contextualized 123 bar\n"
def test_contextualize_in_function(writer):
logger.add(writer, format="{message} {extra}")
def foobar():
logger.info("Foobar!")
with logger.contextualize(foobar="baz"):
foobar()
assert writer.read() == "Foobar! {'foobar': 'baz'}\n"
def test_contextualize_reset():
contexts = []
output = []
def sink(message):
contexts.append(message.record["extra"])
output.append(str(message))
logger.add(sink, format="{level} {message}")
logger.info("A")
with logger.contextualize(abc="def"):
logger.debug("B")
logger.warning("C")
logger.info("D")
assert contexts == [{}, {"abc": "def"}, {"abc": "def"}, {}]
assert output == ["INFO A\n", "DEBUG B\n", "WARNING C\n", "INFO D\n"]
@pytest.mark.xfail(sys.version_info < (3, 5, 3), reason="ContextVar backport not supported")
def test_contextualize_async(writer):
logger.add(writer, format="{message} {extra[i]}", catch=False)
async def task():
logger.info("Start")
await asyncio.sleep(0.1)
logger.info("End")
async def worker(i):
with logger.contextualize(i=i):
await task()
async def main():
workers = [worker(i) for i in range(5)]
await asyncio.gather(*workers)
await logger.complete()
asyncio.run(main())
assert sorted(writer.read().splitlines()) == ["End %d" % i for i in range(5)] + [
"Start %d" % i for i in range(5)
]
def test_contextualize_thread(writer):
logger.add(writer, format="{message} {extra[i]}")
def task():
logger.info("Processing")
def worker(entry_barrier, exit_barrier, i):
with logger.contextualize(i=i):
entry_barrier.wait()
task()
exit_barrier.wait()
entry_barrier = threading.Barrier(5)
exit_barrier = threading.Barrier(5)
threads = [
threading.Thread(target=worker, args=(entry_barrier, exit_barrier, i)) for i in range(5)
]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
assert sorted(writer.read().splitlines()) == ["Processing %d" % i for i in range(5)]
def test_contextualize_before_bind(writer):
logger.add(writer, format="{message} {extra[foobar]}")
logger_2 = logger.bind(foobar="baz")
with logger.contextualize(foobar="baz_2"):
logger.info("A")
logger_2.info("B")
logger_2.info("C")
assert writer.read() == "A baz_2\nB baz\nC baz\n"
def test_contextualize_after_bind(writer):
logger.add(writer, format="{message} {extra[foobar]}")
with logger.contextualize(foobar="baz"):
logger_2 = logger.bind(foobar="baz_2")
logger.info("A")
logger_2.info("B")
logger_2.info("C")
assert writer.read() == "A baz\nB baz_2\nC baz_2\n"
def test_contextualize_using_bound(writer):
logger.add(writer, format="{message} {extra[foobar]}")
logger_2 = logger.bind(foobar="baz")
with logger_2.contextualize(foobar="baz_2"):
logger.info("A")
logger_2.info("B")
logger_2.info("C")
assert writer.read() == "A baz_2\nB baz\nC baz\n"
def test_contextualize_before_configure(writer):
logger.add(writer, format="{message} {extra[foobar]}")
logger.configure(extra={"foobar": "baz"})
with logger.contextualize(foobar="baz_2"):
logger.info("A")
logger.info("B")
assert writer.read() == "A baz_2\nB baz\n"
def test_contextualize_after_configure(writer):
logger.add(writer, format="{message} {extra[foobar]}")
with logger.contextualize(foobar="baz"):
logger.configure(extra={"foobar": "baz_2"})
logger.info("A")
logger.info("B")
assert writer.read() == "A baz\nB baz_2\n"
def test_nested_contextualize(writer):
logger.add(writer, format="{message} {extra[foobar]}")
with logger.contextualize(foobar="a"):
with logger.contextualize(foobar="b"):
logger.info("B")
logger.info("A")
with logger.contextualize(foobar="c"):
logger.info("C")
assert writer.read() == "B b\nA a\nC c\n"
def test_context_reset_despite_error(writer):
logger.add(writer, format="{message} {extra}")
try:
with logger.contextualize(foobar=456):
logger.info("Division")
1 / 0 # noqa: B018
except ZeroDivisionError:
logger.info("Error")
assert writer.read() == "Division {'foobar': 456}\nError {}\n"
# There is not CI runner available for Python 3.5.2. Consequently, we are just
# verifying third-library is properly imported to reach 100% coverage.
def test_contextvars_fallback_352(monkeypatch):
mock_module = MagicMock()
with monkeypatch.context() as context:
context.setattr(sys, "version_info", (3, 5, 2))
context.setitem(sys.modules, "contextvars", mock_module)
assert load_contextvar_class() == mock_module.ContextVar
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