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import logging
from django.template import Context, Engine, Variable, VariableDoesNotExist
from django.test import SimpleTestCase, ignore_warnings
from django.utils.deprecation import RemovedInDjango21Warning
class TestHandler(logging.Handler):
def __init__(self):
super().__init__()
self.log_record = None
def emit(self, record):
self.log_record = record
class BaseTemplateLoggingTestCase(SimpleTestCase):
def setUp(self):
self.test_handler = TestHandler()
self.logger = logging.getLogger('django.template')
self.original_level = self.logger.level
self.logger.addHandler(self.test_handler)
self.logger.setLevel(self.loglevel)
def tearDown(self):
self.logger.removeHandler(self.test_handler)
self.logger.level = self.original_level
class VariableResolveLoggingTests(BaseTemplateLoggingTestCase):
loglevel = logging.DEBUG
def test_log_on_variable_does_not_exist_silent(self):
class TestObject:
class SilentDoesNotExist(Exception):
silent_variable_failure = True
@property
def template_name(self):
return "template_name"
@property
def template(self):
return Engine().from_string('')
@property
def article(self):
raise TestObject.SilentDoesNotExist("Attribute does not exist.")
def __iter__(self):
return iter(attr for attr in dir(TestObject) if attr[:2] != "__")
def __getitem__(self, item):
return self.__dict__[item]
Variable('article').resolve(TestObject())
self.assertEqual(
self.test_handler.log_record.getMessage(),
"Exception while resolving variable 'article' in template 'template_name'."
)
self.assertIsNotNone(self.test_handler.log_record.exc_info)
raised_exception = self.test_handler.log_record.exc_info[1]
self.assertEqual(str(raised_exception), 'Attribute does not exist.')
def test_log_on_variable_does_not_exist_not_silent(self):
with self.assertRaises(VariableDoesNotExist):
Variable('article.author').resolve({'article': {'section': 'News'}})
self.assertEqual(
self.test_handler.log_record.getMessage(),
"Exception while resolving variable 'author' in template 'unknown'."
)
self.assertIsNotNone(self.test_handler.log_record.exc_info)
raised_exception = self.test_handler.log_record.exc_info[1]
self.assertEqual(
str(raised_exception),
"Failed lookup for key [author] in {'section': 'News'}"
)
def test_no_log_when_variable_exists(self):
Variable('article.section').resolve({'article': {'section': 'News'}})
self.assertIsNone(self.test_handler.log_record)
class IncludeNodeLoggingTests(BaseTemplateLoggingTestCase):
loglevel = logging.WARN
@classmethod
def setUpClass(cls):
super().setUpClass()
cls.engine = Engine(loaders=[
('django.template.loaders.locmem.Loader', {
'child': '{{ raises_exception }}',
}),
], debug=False)
def error_method():
raise IndexError("some generic exception")
cls.ctx = Context({'raises_exception': error_method})
def test_logs_exceptions_during_rendering_with_debug_disabled(self):
template = self.engine.from_string('{% include "child" %}')
template.name = 'template_name'
with ignore_warnings(category=RemovedInDjango21Warning):
self.assertEqual(template.render(self.ctx), '')
self.assertEqual(
self.test_handler.log_record.getMessage(),
"Exception raised while rendering {% include %} for template "
"'template_name'. Empty string rendered instead."
)
self.assertIsNotNone(self.test_handler.log_record.exc_info)
self.assertEqual(self.test_handler.log_record.levelno, logging.WARN)
def test_logs_exceptions_during_rendering_with_no_template_name(self):
template = self.engine.from_string('{% include "child" %}')
with ignore_warnings(category=RemovedInDjango21Warning):
self.assertEqual(template.render(self.ctx), '')
self.assertEqual(
self.test_handler.log_record.getMessage(),
"Exception raised while rendering {% include %} for template "
"'unknown'. Empty string rendered instead."
)
self.assertIsNotNone(self.test_handler.log_record.exc_info)
self.assertEqual(self.test_handler.log_record.levelno, logging.WARN)
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