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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test cases for L{twisted.logger._logger}.
"""
from typing import List, Optional, Type, cast
from zope.interface import implementer
from constantly import NamedConstant
from twisted.trial import unittest
from .._format import formatEvent
from .._global import globalLogPublisher
from .._interfaces import ILogObserver, LogEvent
from .._levels import InvalidLogLevelError, LogLevel
from .._logger import Logger
class TestLogger(Logger):
"""
L{Logger} with an overridden C{emit} method that keeps track of received
events.
"""
def emit(
self, level: NamedConstant, format: Optional[str] = None, **kwargs: object
) -> None:
@implementer(ILogObserver)
def observer(event: LogEvent) -> None:
self.event = event
globalLogPublisher.addObserver(observer)
try:
Logger.emit(self, level, format, **kwargs)
finally:
globalLogPublisher.removeObserver(observer)
self.emitted = {
"level": level,
"format": format,
"kwargs": kwargs,
}
class LogComposedObject:
"""
A regular object, with a logger attached.
"""
log = TestLogger()
def __init__(self, state: Optional[str] = None) -> None:
self.state = state
def __str__(self) -> str:
return f"<LogComposedObject {self.state}>"
class LoggerTests(unittest.TestCase):
"""
Tests for L{Logger}.
"""
def test_repr(self) -> None:
"""
repr() on Logger
"""
namespace = "bleargh"
log = Logger(namespace)
self.assertEqual(repr(log), f"<Logger {repr(namespace)}>")
def test_namespaceDefault(self) -> None:
"""
Default namespace is module name.
"""
log = Logger()
self.assertEqual(log.namespace, __name__)
def test_namespaceOMGItsTooHard(self) -> None:
"""
Default namespace is C{"<unknown>"} when a logger is created from a
context in which is can't be determined automatically and no namespace
was specified.
"""
result: List[Logger] = []
exec(
"result.append(Logger())",
dict(Logger=Logger),
locals(),
)
self.assertEqual(result[0].namespace, "<unknown>")
def test_namespaceAttribute(self) -> None:
"""
Default namespace for classes using L{Logger} as a descriptor is the
class name they were retrieved from.
"""
obj = LogComposedObject()
expectedNamespace = "{}.{}".format(
obj.__module__,
obj.__class__.__name__,
)
self.assertEqual(cast(TestLogger, obj.log).namespace, expectedNamespace)
self.assertEqual(
cast(Type[TestLogger], LogComposedObject.log).namespace, expectedNamespace
)
self.assertIs(
cast(Type[TestLogger], LogComposedObject.log).source, LogComposedObject
)
self.assertIs(cast(TestLogger, obj.log).source, obj)
self.assertIsNone(Logger().source)
def test_descriptorObserver(self) -> None:
"""
When used as a descriptor, the observer is propagated.
"""
observed: List[LogEvent] = []
class MyObject:
log = Logger(observer=cast(ILogObserver, observed.append))
MyObject.log.info("hello")
self.assertEqual(len(observed), 1)
self.assertEqual(observed[0]["log_format"], "hello")
def test_sourceAvailableForFormatting(self) -> None:
"""
On instances that have a L{Logger} class attribute, the C{log_source}
key is available to format strings.
"""
obj = LogComposedObject("hello")
log = cast(TestLogger, obj.log)
log.error("Hello, {log_source}.")
self.assertIn("log_source", log.event)
self.assertEqual(log.event["log_source"], obj)
stuff = formatEvent(log.event)
self.assertIn("Hello, <LogComposedObject hello>.", stuff)
def test_basicLogger(self) -> None:
"""
Test that log levels and messages are emitted correctly for
Logger.
"""
log = TestLogger()
for level in LogLevel.iterconstants():
format = "This is a {level_name} message"
message = format.format(level_name=level.name)
logMethod = getattr(log, level.name)
logMethod(format, junk=message, level_name=level.name)
# Ensure that test_emit got called with expected arguments
self.assertEqual(log.emitted["level"], level)
self.assertEqual(log.emitted["format"], format)
self.assertEqual(log.emitted["kwargs"]["junk"], message)
self.assertTrue(hasattr(log, "event"), "No event observed.")
self.assertEqual(log.event["log_format"], format)
self.assertEqual(log.event["log_level"], level)
self.assertEqual(log.event["log_namespace"], __name__)
self.assertIsNone(log.event["log_source"])
self.assertEqual(log.event["junk"], message)
self.assertEqual(formatEvent(log.event), message)
def test_sourceOnClass(self) -> None:
"""
C{log_source} event key refers to the class.
"""
@implementer(ILogObserver)
def observer(event: LogEvent) -> None:
self.assertEqual(event["log_source"], Thingo)
class Thingo:
log = TestLogger(observer=observer)
cast(TestLogger, Thingo.log).info()
def test_sourceOnInstance(self) -> None:
"""
C{log_source} event key refers to the instance.
"""
@implementer(ILogObserver)
def observer(event: LogEvent) -> None:
self.assertEqual(event["log_source"], thingo)
class Thingo:
log = TestLogger(observer=observer)
thingo = Thingo()
cast(TestLogger, thingo.log).info()
def test_sourceUnbound(self) -> None:
"""
C{log_source} event key is L{None}.
"""
@implementer(ILogObserver)
def observer(event: LogEvent) -> None:
self.assertIsNone(event["log_source"])
log = TestLogger(observer=observer)
log.info()
def test_defaultFailure(self) -> None:
"""
Test that log.failure() emits the right data.
"""
log = TestLogger()
try:
raise RuntimeError("baloney!")
except RuntimeError:
log.failure("Whoops")
errors = self.flushLoggedErrors(RuntimeError)
self.assertEqual(len(errors), 1)
self.assertEqual(log.emitted["level"], LogLevel.critical)
self.assertEqual(log.emitted["format"], "Whoops")
def test_conflictingKwargs(self) -> None:
"""
Make sure that kwargs conflicting with args don't pass through.
"""
log = TestLogger()
log.warn(
"*",
log_format="#",
log_level=LogLevel.error,
log_namespace="*namespace*",
log_source="*source*",
)
self.assertEqual(log.event["log_format"], "*")
self.assertEqual(log.event["log_level"], LogLevel.warn)
self.assertEqual(log.event["log_namespace"], log.namespace)
self.assertIsNone(log.event["log_source"])
def test_logInvalidLogLevel(self) -> None:
"""
Test passing in a bogus log level to C{emit()}.
"""
log = TestLogger()
log.emit("*bogus*")
errors = self.flushLoggedErrors(InvalidLogLevelError)
self.assertEqual(len(errors), 1)
def test_trace(self) -> None:
"""
Tracing keeps track of forwarding to the publisher.
"""
@implementer(ILogObserver)
def publisher(event: LogEvent) -> None:
observer(event)
@implementer(ILogObserver)
def observer(event: LogEvent) -> None:
self.assertEqual(event["log_trace"], [(log, publisher)])
log = TestLogger(observer=publisher)
log.info("Hello.", log_trace=[])
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