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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test cases for L{twisted.logger._io}.
"""
import sys
from typing import List, Optional
from zope.interface import implementer
from constantly import NamedConstant # type: ignore[import]
from twisted.trial import unittest
from .._interfaces import ILogObserver, LogEvent
from .._io import LoggingFile
from .._levels import LogLevel
from .._logger import Logger
from .._observer import LogPublisher
@implementer(ILogObserver)
class TestLoggingFile(LoggingFile):
"""
L{LoggingFile} that is also an observer which captures events and messages.
"""
def __init__(
self,
logger: Logger,
level: NamedConstant = LogLevel.info,
encoding: Optional[str] = None,
) -> None:
super().__init__(logger=logger, level=level, encoding=encoding)
self.events: List[LogEvent] = []
self.messages: List[str] = []
def __call__(self, event: LogEvent) -> None:
self.events.append(event)
if "log_io" in event:
self.messages.append(event["log_io"])
class LoggingFileTests(unittest.TestCase):
"""
Tests for L{LoggingFile}.
"""
def setUp(self) -> None:
"""
Create a logger for test L{LoggingFile} instances to use.
"""
self.publisher = LogPublisher()
self.logger = Logger(observer=self.publisher)
def test_softspace(self) -> None:
"""
L{LoggingFile.softspace} is 0.
"""
self.assertEqual(LoggingFile(self.logger).softspace, 0)
warningsShown = self.flushWarnings([self.test_softspace])
self.assertEqual(len(warningsShown), 1)
self.assertEqual(warningsShown[0]["category"], DeprecationWarning)
deprecatedClass = "twisted.logger._io.LoggingFile.softspace"
self.assertEqual(
warningsShown[0]["message"],
"%s was deprecated in Twisted 21.2.0" % (deprecatedClass),
)
def test_readOnlyAttributes(self) -> None:
"""
Some L{LoggingFile} attributes are read-only.
"""
f = LoggingFile(self.logger)
self.assertRaises(AttributeError, setattr, f, "closed", True)
self.assertRaises(AttributeError, setattr, f, "encoding", "utf-8")
self.assertRaises(AttributeError, setattr, f, "mode", "r")
self.assertRaises(AttributeError, setattr, f, "newlines", ["\n"])
self.assertRaises(AttributeError, setattr, f, "name", "foo")
def test_unsupportedMethods(self) -> None:
"""
Some L{LoggingFile} methods are unsupported.
"""
f = LoggingFile(self.logger)
self.assertRaises(IOError, f.read)
self.assertRaises(IOError, f.next)
self.assertRaises(IOError, f.readline)
self.assertRaises(IOError, f.readlines)
self.assertRaises(IOError, f.xreadlines)
self.assertRaises(IOError, f.seek)
self.assertRaises(IOError, f.tell)
self.assertRaises(IOError, f.truncate)
def test_level(self) -> None:
"""
Default level is L{LogLevel.info} if not set.
"""
f = LoggingFile(self.logger)
self.assertEqual(f.level, LogLevel.info)
f = LoggingFile(self.logger, level=LogLevel.error)
self.assertEqual(f.level, LogLevel.error)
def test_encoding(self) -> None:
"""
Default encoding is C{sys.getdefaultencoding()} if not set.
"""
f = LoggingFile(self.logger)
self.assertEqual(f.encoding, sys.getdefaultencoding())
f = LoggingFile(self.logger, encoding="utf-8")
self.assertEqual(f.encoding, "utf-8")
def test_mode(self) -> None:
"""
Reported mode is C{"w"}.
"""
f = LoggingFile(self.logger)
self.assertEqual(f.mode, "w")
def test_newlines(self) -> None:
"""
The C{newlines} attribute is L{None}.
"""
f = LoggingFile(self.logger)
self.assertIsNone(f.newlines)
def test_name(self) -> None:
"""
The C{name} attribute is fixed.
"""
f = LoggingFile(self.logger)
self.assertEqual(f.name, "<LoggingFile twisted.logger.test.test_io#info>")
def test_close(self) -> None:
"""
L{LoggingFile.close} closes the file.
"""
f = LoggingFile(self.logger)
f.close()
self.assertTrue(f.closed)
self.assertRaises(ValueError, f.write, "Hello")
def test_flush(self) -> None:
"""
L{LoggingFile.flush} does nothing.
"""
f = LoggingFile(self.logger)
f.flush()
def test_fileno(self) -> None:
"""
L{LoggingFile.fileno} returns C{-1}.
"""
f = LoggingFile(self.logger)
self.assertEqual(f.fileno(), -1)
def test_isatty(self) -> None:
"""
L{LoggingFile.isatty} returns C{False}.
"""
f = LoggingFile(self.logger)
self.assertFalse(f.isatty())
def test_writeBuffering(self) -> None:
"""
Writing buffers correctly.
"""
f = self.observedFile()
f.write("Hello")
self.assertEqual(f.messages, [])
f.write(", world!\n")
self.assertEqual(f.messages, ["Hello, world!"])
f.write("It's nice to meet you.\n\nIndeed.")
self.assertEqual(
f.messages,
[
"Hello, world!",
"It's nice to meet you.",
"",
],
)
def test_writeBytesDecoded(self) -> None:
"""
Bytes are decoded to text.
"""
f = self.observedFile(encoding="utf-8")
f.write(b"Hello, Mr. S\xc3\xa1nchez\n")
self.assertEqual(f.messages, ["Hello, Mr. S\xe1nchez"])
def test_writeUnicode(self) -> None:
"""
Unicode is unmodified.
"""
f = self.observedFile(encoding="utf-8")
f.write("Hello, Mr. S\xe1nchez\n")
self.assertEqual(f.messages, ["Hello, Mr. S\xe1nchez"])
def test_writeLevel(self) -> None:
"""
Log level is emitted properly.
"""
f = self.observedFile()
f.write("Hello\n")
self.assertEqual(len(f.events), 1)
self.assertEqual(f.events[0]["log_level"], LogLevel.info)
f = self.observedFile(level=LogLevel.error)
f.write("Hello\n")
self.assertEqual(len(f.events), 1)
self.assertEqual(f.events[0]["log_level"], LogLevel.error)
def test_writeFormat(self) -> None:
"""
Log format is C{"{message}"}.
"""
f = self.observedFile()
f.write("Hello\n")
self.assertEqual(len(f.events), 1)
self.assertEqual(f.events[0]["log_format"], "{log_io}")
def test_writelinesBuffering(self) -> None:
"""
C{writelines} does not add newlines.
"""
# Note this is different behavior than t.p.log.StdioOnnaStick.
f = self.observedFile()
f.writelines(("Hello", ", ", ""))
self.assertEqual(f.messages, [])
f.writelines(("world!\n",))
self.assertEqual(f.messages, ["Hello, world!"])
f.writelines(("It's nice to meet you.\n\n", "Indeed."))
self.assertEqual(
f.messages,
[
"Hello, world!",
"It's nice to meet you.",
"",
],
)
def test_print(self) -> None:
"""
L{LoggingFile} can replace L{sys.stdout}.
"""
f = self.observedFile()
self.patch(sys, "stdout", f)
print("Hello,", end=" ")
print("world.")
self.assertEqual(f.messages, ["Hello, world."])
def observedFile(
self,
level: NamedConstant = LogLevel.info,
encoding: Optional[str] = None,
) -> TestLoggingFile:
"""
Construct a L{LoggingFile} with a built-in observer.
@param level: C{level} argument to L{LoggingFile}
@param encoding: C{encoding} argument to L{LoggingFile}
@return: a L{TestLoggingFile} with an observer that appends received
events into the file's C{events} attribute (a L{list}) and
event messages into the file's C{messages} attribute (a L{list}).
"""
# Logger takes an observer argument, for which we want to use the
# TestLoggingFile we will create, but that takes the Logger as an
# argument, so we'll use an array to indirectly reference the
# TestLoggingFile.
loggingFiles: List[TestLoggingFile] = []
@implementer(ILogObserver)
def observer(event: LogEvent) -> None:
loggingFiles[0](event)
log = Logger(observer=observer)
loggingFiles.append(TestLoggingFile(logger=log, level=level, encoding=encoding))
return loggingFiles[0]
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