Current File : //lib/python3/dist-packages/twisted/logger/test/test_format.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test cases for L{twisted.logger._format}.
"""
from typing import AnyStr, Dict, Optional, cast
try:
from time import tzset
# We should upgrade to a version of pyflakes that does not require this.
tzset
except ImportError:
tzset = None # type: ignore[assignment]
from twisted.python.failure import Failure
from twisted.python.test.test_tzhelper import addTZCleanup, mktime, setTZ
from twisted.trial import unittest
from twisted.trial.unittest import SkipTest
from .._format import (
eventAsText,
formatEvent,
formatEventAsClassicLogText,
formatTime,
formatUnformattableEvent,
formatWithCall,
)
from .._interfaces import LogEvent
from .._levels import LogLevel
class FormattingTests(unittest.TestCase):
"""
Tests for basic event formatting functions.
"""
def format(self, logFormat: AnyStr, **event: object) -> str:
"""
Create a Twisted log event dictionary from C{event} with the given
C{logFormat} format string, format it with L{formatEvent}, ensure that
its type is L{str}, and return its result.
"""
event["log_format"] = logFormat
result = formatEvent(event)
self.assertIs(type(result), str)
return result
def test_formatEvent(self) -> None:
"""
L{formatEvent} will format an event according to several rules:
- A string with no formatting instructions will be passed straight
through.
- PEP 3101 strings will be formatted using the keys and values of
the event as named fields.
- PEP 3101 keys ending with C{()} will be treated as instructions
to call that key (which ought to be a callable) before
formatting.
L{formatEvent} will always return L{str}, and if given bytes, will
always treat its format string as UTF-8 encoded.
"""
self.assertEqual("", self.format(b""))
self.assertEqual("", self.format(""))
self.assertEqual("abc", self.format("{x}", x="abc"))
self.assertEqual(
"no, yes.",
self.format(
"{not_called}, {called()}.", not_called="no", called=lambda: "yes"
),
)
self.assertEqual("S\xe1nchez", self.format(b"S\xc3\xa1nchez"))
self.assertIn("Unable to format event", self.format(b"S\xe1nchez"))
maybeResult = self.format(b"S{a!s}nchez", a=b"\xe1")
self.assertIn("Sb'\\xe1'nchez", maybeResult)
xe1 = str(repr(b"\xe1"))
self.assertIn("S" + xe1 + "nchez", self.format(b"S{a!r}nchez", a=b"\xe1"))
def test_formatMethod(self) -> None:
"""
L{formatEvent} will format PEP 3101 keys containing C{.}s ending with
C{()} as methods.
"""
class World:
def where(self) -> str:
return "world"
self.assertEqual(
"hello world", self.format("hello {what.where()}", what=World())
)
def test_formatAttributeSubscript(self) -> None:
"""
L{formatEvent} will format subscripts of attributes per PEP 3101.
"""
class Example(object):
config: Dict[str, str] = dict(foo="bar", baz="qux")
self.assertEqual(
"bar qux",
self.format(
"{example.config[foo]} {example.config[baz]}",
example=Example(),
),
)
def test_formatEventNoFormat(self) -> None:
"""
Formatting an event with no format.
"""
event = dict(foo=1, bar=2)
result = formatEvent(event)
self.assertEqual("", result)
def test_formatEventWeirdFormat(self) -> None:
"""
Formatting an event with a bogus format.
"""
event = dict(log_format=object(), foo=1, bar=2)
result = formatEvent(event)
self.assertIn("Log format must be str", result)
self.assertIn(repr(event), result)
def test_formatUnformattableEvent(self) -> None:
"""
Formatting an event that's just plain out to get us.
"""
event = dict(log_format="{evil()}", evil=lambda: 1 / 0)
result = formatEvent(event)
self.assertIn("Unable to format event", result)
self.assertIn(repr(event), result)
def test_formatUnformattableEventWithUnformattableKey(self) -> None:
"""
Formatting an unformattable event that has an unformattable key.
"""
event: LogEvent = {
"log_format": "{evil()}",
"evil": lambda: 1 / 0,
cast(str, Unformattable()): "gurk",
}
result = formatEvent(event)
self.assertIn("MESSAGE LOST: unformattable object logged:", result)
self.assertIn("Recoverable data:", result)
self.assertIn("Exception during formatting:", result)
def test_formatUnformattableEventWithUnformattableValue(self) -> None:
"""
Formatting an unformattable event that has an unformattable value.
"""
event = dict(
log_format="{evil()}",
evil=lambda: 1 / 0,
gurk=Unformattable(),
)
result = formatEvent(event)
self.assertIn("MESSAGE LOST: unformattable object logged:", result)
self.assertIn("Recoverable data:", result)
self.assertIn("Exception during formatting:", result)
def test_formatUnformattableEventWithUnformattableErrorOMGWillItStop(self) -> None:
"""
Formatting an unformattable event that has an unformattable value.
"""
event = dict(
log_format="{evil()}",
evil=lambda: 1 / 0,
recoverable="okay",
)
# Call formatUnformattableEvent() directly with a bogus exception.
result = formatUnformattableEvent(event, cast(BaseException, Unformattable()))
self.assertIn("MESSAGE LOST: unformattable object logged:", result)
self.assertIn(repr("recoverable") + " = " + repr("okay"), result)
class TimeFormattingTests(unittest.TestCase):
"""
Tests for time formatting functions.
"""
def setUp(self) -> None:
addTZCleanup(self)
def test_formatTimeWithDefaultFormat(self) -> None:
"""
Default time stamp format is RFC 3339 and offset respects the timezone
as set by the standard C{TZ} environment variable and L{tzset} API.
"""
if tzset is None:
raise SkipTest("Platform cannot change timezone; unable to verify offsets.")
def testForTimeZone(
name: str, expectedDST: Optional[str], expectedSTD: str
) -> None:
setTZ(name)
localSTD = mktime((2007, 1, 31, 0, 0, 0, 2, 31, 0))
self.assertEqual(formatTime(localSTD), expectedSTD)
if expectedDST:
localDST = mktime((2006, 6, 30, 0, 0, 0, 4, 181, 1))
self.assertEqual(formatTime(localDST), expectedDST)
# UTC
testForTimeZone(
"UTC+00",
None,
"2007-01-31T00:00:00+0000",
)
# West of UTC
testForTimeZone(
"EST+05EDT,M4.1.0,M10.5.0",
"2006-06-30T00:00:00-0400",
"2007-01-31T00:00:00-0500",
)
# East of UTC
testForTimeZone(
"CEST-01CEDT,M4.1.0,M10.5.0",
"2006-06-30T00:00:00+0200",
"2007-01-31T00:00:00+0100",
)
# No DST
testForTimeZone(
"CST+06",
None,
"2007-01-31T00:00:00-0600",
)
def test_formatTimeWithNoTime(self) -> None:
"""
If C{when} argument is L{None}, we get the default output.
"""
self.assertEqual(formatTime(None), "-")
self.assertEqual(formatTime(None, default="!"), "!")
def test_formatTimeWithNoFormat(self) -> None:
"""
If C{timeFormat} argument is L{None}, we get the default output.
"""
t = mktime((2013, 9, 24, 11, 40, 47, 1, 267, -1))
self.assertEqual(formatTime(t, timeFormat=None), "-")
self.assertEqual(formatTime(t, timeFormat=None, default="!"), "!")
def test_formatTimeWithAlternateTimeFormat(self) -> None:
"""
Alternate time format in output.
"""
t = mktime((2013, 9, 24, 11, 40, 47, 1, 267, -1))
self.assertEqual(formatTime(t, timeFormat="%Y/%W"), "2013/38")
def test_formatTimePercentF(self) -> None:
"""
"%f" supported in time format.
"""
self.assertEqual(formatTime(1000000.23456, timeFormat="%f"), "234560")
class ClassicLogFormattingTests(unittest.TestCase):
"""
Tests for classic text log event formatting functions.
"""
def test_formatTimeDefault(self) -> None:
"""
Time is first field. Default time stamp format is RFC 3339 and offset
respects the timezone as set by the standard C{TZ} environment variable
and L{tzset} API.
"""
if tzset is None:
raise SkipTest("Platform cannot change timezone; unable to verify offsets.")
addTZCleanup(self)
setTZ("UTC+00")
t = mktime((2013, 9, 24, 11, 40, 47, 1, 267, -1))
event = dict(log_format="XYZZY", log_time=t)
self.assertEqual(
formatEventAsClassicLogText(event),
"2013-09-24T11:40:47+0000 [-\x23-] XYZZY\n",
)
def test_formatTimeCustom(self) -> None:
"""
Time is first field. Custom formatting function is an optional
argument.
"""
def formatTime(t: Optional[float]) -> str:
return f"__{t}__"
event = dict(log_format="XYZZY", log_time=12345)
self.assertEqual(
formatEventAsClassicLogText(event, formatTime=formatTime),
"__12345__ [-\x23-] XYZZY\n",
)
def test_formatNamespace(self) -> None:
"""
Namespace is first part of second field.
"""
event = dict(log_format="XYZZY", log_namespace="my.namespace")
self.assertEqual(
formatEventAsClassicLogText(event),
"- [my.namespace\x23-] XYZZY\n",
)
def test_formatLevel(self) -> None:
"""
Level is second part of second field.
"""
event = dict(log_format="XYZZY", log_level=LogLevel.warn)
self.assertEqual(
formatEventAsClassicLogText(event),
"- [-\x23warn] XYZZY\n",
)
def test_formatSystem(self) -> None:
"""
System is second field.
"""
event = dict(log_format="XYZZY", log_system="S.Y.S.T.E.M.")
self.assertEqual(
formatEventAsClassicLogText(event),
"- [S.Y.S.T.E.M.] XYZZY\n",
)
def test_formatSystemRulz(self) -> None:
"""
System is not supplanted by namespace and level.
"""
event = dict(
log_format="XYZZY",
log_namespace="my.namespace",
log_level=LogLevel.warn,
log_system="S.Y.S.T.E.M.",
)
self.assertEqual(
formatEventAsClassicLogText(event),
"- [S.Y.S.T.E.M.] XYZZY\n",
)
def test_formatSystemUnformattable(self) -> None:
"""
System is not supplanted by namespace and level.
"""
event = dict(log_format="XYZZY", log_system=Unformattable())
self.assertEqual(
formatEventAsClassicLogText(event),
"- [UNFORMATTABLE] XYZZY\n",
)
def test_formatFormat(self) -> None:
"""
Formatted event is last field.
"""
event = dict(log_format="id:{id}", id="123")
self.assertEqual(
formatEventAsClassicLogText(event),
"- [-\x23-] id:123\n",
)
def test_formatNoFormat(self) -> None:
"""
No format string.
"""
event = dict(id="123")
self.assertIs(formatEventAsClassicLogText(event), None)
def test_formatEmptyFormat(self) -> None:
"""
Empty format string.
"""
event = dict(log_format="", id="123")
self.assertIs(formatEventAsClassicLogText(event), None)
def test_formatFormatMultiLine(self) -> None:
"""
If the formatted event has newlines, indent additional lines.
"""
event = dict(log_format='XYZZY\nA hollow voice says:\n"Plugh"')
self.assertEqual(
formatEventAsClassicLogText(event),
'- [-\x23-] XYZZY\n\tA hollow voice says:\n\t"Plugh"\n',
)
class FormatFieldTests(unittest.TestCase):
"""
Tests for format field functions.
"""
def test_formatWithCall(self) -> None:
"""
L{formatWithCall} is an extended version of L{str.format} that
will interpret a set of parentheses "C{()}" at the end of a format key
to mean that the format key ought to be I{called} rather than
stringified.
"""
self.assertEqual(
formatWithCall(
"Hello, {world}. {callme()}.",
dict(world="earth", callme=lambda: "maybe"),
),
"Hello, earth. maybe.",
)
self.assertEqual(
formatWithCall("Hello, {repr()!r}.", dict(repr=lambda: "repr")),
"Hello, 'repr'.",
)
class Unformattable:
"""
An object that raises an exception from C{__repr__}.
"""
def __repr__(self) -> str:
return str(1 / 0)
class CapturedError(Exception):
"""
A captured error for use in format tests.
"""
class EventAsTextTests(unittest.TestCase):
"""
Tests for L{eventAsText}, all of which ensure that the
returned type is UTF-8 decoded text.
"""
def test_eventWithTraceback(self) -> None:
"""
An event with a C{log_failure} key will have a traceback appended.
"""
try:
raise CapturedError("This is a fake error")
except CapturedError:
f = Failure()
event: LogEvent = {"log_format": "This is a test log message"}
event["log_failure"] = f
eventText = eventAsText(event, includeTimestamp=True, includeSystem=False)
self.assertIn(str(f.getTraceback()), eventText)
self.assertIn("This is a test log message", eventText)
def test_formatEmptyEventWithTraceback(self) -> None:
"""
An event with an empty C{log_format} key appends a traceback from
the accompanying failure.
"""
try:
raise CapturedError("This is a fake error")
except CapturedError:
f = Failure()
event: LogEvent = {"log_format": ""}
event["log_failure"] = f
eventText = eventAsText(event, includeTimestamp=True, includeSystem=False)
self.assertIn(str(f.getTraceback()), eventText)
self.assertIn("This is a fake error", eventText)
def test_formatUnformattableWithTraceback(self) -> None:
"""
An event with an unformattable value in the C{log_format} key still
has a traceback appended.
"""
try:
raise CapturedError("This is a fake error")
except CapturedError:
f = Failure()
event = {
"log_format": "{evil()}",
"evil": lambda: 1 / 0,
}
event["log_failure"] = f
eventText = eventAsText(event, includeTimestamp=True, includeSystem=False)
self.assertIsInstance(eventText, str)
self.assertIn(str(f.getTraceback()), eventText)
self.assertIn("This is a fake error", eventText)
def test_formatUnformattableErrorWithTraceback(self) -> None:
"""
An event with an unformattable value in the C{log_format} key, that
throws an exception when __repr__ is invoked still has a traceback
appended.
"""
try:
raise CapturedError("This is a fake error")
except CapturedError:
f = Failure()
event: LogEvent = {
"log_format": "{evil()}",
"evil": lambda: 1 / 0,
cast(str, Unformattable()): "gurk",
}
event["log_failure"] = f
eventText = eventAsText(event, includeTimestamp=True, includeSystem=False)
self.assertIsInstance(eventText, str)
self.assertIn("MESSAGE LOST", eventText)
self.assertIn(str(f.getTraceback()), eventText)
self.assertIn("This is a fake error", eventText)
def test_formatEventUnformattableTraceback(self) -> None:
"""
If a traceback cannot be appended, a message indicating this is true
is appended.
"""
event: LogEvent = {"log_format": ""}
event["log_failure"] = object()
eventText = eventAsText(event, includeTimestamp=True, includeSystem=False)
self.assertIsInstance(eventText, str)
self.assertIn("(UNABLE TO OBTAIN TRACEBACK FROM EVENT)", eventText)
def test_formatEventNonCritical(self) -> None:
"""
An event with no C{log_failure} key will not have a traceback appended.
"""
event: LogEvent = {"log_format": "This is a test log message"}
eventText = eventAsText(event, includeTimestamp=True, includeSystem=False)
self.assertIsInstance(eventText, str)
self.assertIn("This is a test log message", eventText)
def test_formatTracebackMultibyte(self) -> None:
"""
An exception message with multibyte characters is properly handled.
"""
try:
raise CapturedError("€")
except CapturedError:
f = Failure()
event: LogEvent = {"log_format": "This is a test log message"}
event["log_failure"] = f
eventText = eventAsText(event, includeTimestamp=True, includeSystem=False)
self.assertIn("€", eventText)
self.assertIn("Traceback", eventText)
def test_formatTracebackHandlesUTF8DecodeFailure(self) -> None:
"""
An error raised attempting to decode the UTF still produces a
valid log message.
"""
try:
# 'test' in utf-16
raise CapturedError(b"\xff\xfet\x00e\x00s\x00t\x00")
except CapturedError:
f = Failure()
event: LogEvent = {"log_format": "This is a test log message"}
event["log_failure"] = f
eventText = eventAsText(event, includeTimestamp=True, includeSystem=False)
self.assertIn("Traceback", eventText)
self.assertIn(r'CapturedError(b"\xff\xfet\x00e\x00s\x00t\x00")', eventText)
def test_eventAsTextSystemOnly(self) -> None:
"""
If includeSystem is specified as the only option no timestamp or
traceback are printed.
"""
try:
raise CapturedError("This is a fake error")
except CapturedError:
f = Failure()
t = mktime((2013, 9, 24, 11, 40, 47, 1, 267, -1))
event: LogEvent = {
"log_format": "ABCD",
"log_system": "fake_system",
"log_time": t,
}
event["log_failure"] = f
eventText = eventAsText(
event,
includeTimestamp=False,
includeTraceback=False,
includeSystem=True,
)
self.assertEqual(
eventText,
"[fake_system] ABCD",
)
def test_eventAsTextTimestampOnly(self) -> None:
"""
If includeTimestamp is specified as the only option no system or
traceback are printed.
"""
if tzset is None:
raise SkipTest("Platform cannot change timezone; unable to verify offsets.")
addTZCleanup(self)
setTZ("UTC+00")
try:
raise CapturedError("This is a fake error")
except CapturedError:
f = Failure()
t = mktime((2013, 9, 24, 11, 40, 47, 1, 267, -1))
event: LogEvent = {
"log_format": "ABCD",
"log_system": "fake_system",
"log_time": t,
}
event["log_failure"] = f
eventText = eventAsText(
event,
includeTimestamp=True,
includeTraceback=False,
includeSystem=False,
)
self.assertEqual(
eventText,
"2013-09-24T11:40:47+0000 ABCD",
)
def test_eventAsTextSystemMissing(self) -> None:
"""
If includeSystem is specified with a missing system [-#-]
is used.
"""
try:
raise CapturedError("This is a fake error")
except CapturedError:
f = Failure()
t = mktime((2013, 9, 24, 11, 40, 47, 1, 267, -1))
event: LogEvent = {
"log_format": "ABCD",
"log_time": t,
}
event["log_failure"] = f
eventText = eventAsText(
event,
includeTimestamp=False,
includeTraceback=False,
includeSystem=True,
)
self.assertEqual(
eventText,
"[-\x23-] ABCD",
)
def test_eventAsTextSystemMissingNamespaceAndLevel(self) -> None:
"""
If includeSystem is specified with a missing system but
namespace and level are present they are used.
"""
try:
raise CapturedError("This is a fake error")
except CapturedError:
f = Failure()
t = mktime((2013, 9, 24, 11, 40, 47, 1, 267, -1))
event: LogEvent = {
"log_format": "ABCD",
"log_time": t,
"log_level": LogLevel.info,
"log_namespace": "test",
}
event["log_failure"] = f
eventText = eventAsText(
event,
includeTimestamp=False,
includeTraceback=False,
includeSystem=True,
)
self.assertEqual(
eventText,
"[test\x23info] ABCD",
)
def test_eventAsTextSystemMissingLevelOnly(self) -> None:
"""
If includeSystem is specified with a missing system but
level is present, level is included.
"""
try:
raise CapturedError("This is a fake error")
except CapturedError:
f = Failure()
t = mktime((2013, 9, 24, 11, 40, 47, 1, 267, -1))
event: LogEvent = {
"log_format": "ABCD",
"log_time": t,
"log_level": LogLevel.info,
}
event["log_failure"] = f
eventText = eventAsText(
event,
includeTimestamp=False,
includeTraceback=False,
includeSystem=True,
)
self.assertEqual(
eventText,
"[-\x23info] ABCD",
)
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