/usr/lib/python3/dist-packages/_pytest/logging.py is in python3-pytest 3.3.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import logging
from contextlib import closing, contextmanager
import sys
import six
import pytest
import py
DEFAULT_LOG_FORMAT = '%(filename)-25s %(lineno)4d %(levelname)-8s %(message)s'
DEFAULT_LOG_DATE_FORMAT = '%H:%M:%S'
def get_option_ini(config, *names):
for name in names:
ret = config.getoption(name) # 'default' arg won't work as expected
if ret is None:
ret = config.getini(name)
if ret:
return ret
def pytest_addoption(parser):
"""Add options to control log capturing."""
group = parser.getgroup('logging')
def add_option_ini(option, dest, default=None, type=None, **kwargs):
parser.addini(dest, default=default, type=type,
help='default value for ' + option)
group.addoption(option, dest=dest, **kwargs)
add_option_ini(
'--no-print-logs',
dest='log_print', action='store_const', const=False, default=True,
type='bool',
help='disable printing caught logs on failed tests.')
add_option_ini(
'--log-level',
dest='log_level', default=None,
help='logging level used by the logging module')
add_option_ini(
'--log-format',
dest='log_format', default=DEFAULT_LOG_FORMAT,
help='log format as used by the logging module.')
add_option_ini(
'--log-date-format',
dest='log_date_format', default=DEFAULT_LOG_DATE_FORMAT,
help='log date format as used by the logging module.')
add_option_ini(
'--log-cli-level',
dest='log_cli_level', default=None,
help='cli logging level.')
add_option_ini(
'--log-cli-format',
dest='log_cli_format', default=None,
help='log format as used by the logging module.')
add_option_ini(
'--log-cli-date-format',
dest='log_cli_date_format', default=None,
help='log date format as used by the logging module.')
add_option_ini(
'--log-file',
dest='log_file', default=None,
help='path to a file when logging will be written to.')
add_option_ini(
'--log-file-level',
dest='log_file_level', default=None,
help='log file logging level.')
add_option_ini(
'--log-file-format',
dest='log_file_format', default=DEFAULT_LOG_FORMAT,
help='log format as used by the logging module.')
add_option_ini(
'--log-file-date-format',
dest='log_file_date_format', default=DEFAULT_LOG_DATE_FORMAT,
help='log date format as used by the logging module.')
@contextmanager
def catching_logs(handler, formatter=None, level=logging.NOTSET):
"""Context manager that prepares the whole logging machinery properly."""
root_logger = logging.getLogger()
if formatter is not None:
handler.setFormatter(formatter)
handler.setLevel(level)
# Adding the same handler twice would confuse logging system.
# Just don't do that.
add_new_handler = handler not in root_logger.handlers
if add_new_handler:
root_logger.addHandler(handler)
orig_level = root_logger.level
root_logger.setLevel(min(orig_level, level))
try:
yield handler
finally:
root_logger.setLevel(orig_level)
if add_new_handler:
root_logger.removeHandler(handler)
class LogCaptureHandler(logging.StreamHandler):
"""A logging handler that stores log records and the log text."""
def __init__(self):
"""Creates a new log handler."""
logging.StreamHandler.__init__(self, py.io.TextIO())
self.records = []
def emit(self, record):
"""Keep the log records in a list in addition to the log text."""
self.records.append(record)
logging.StreamHandler.emit(self, record)
class LogCaptureFixture(object):
"""Provides access and control of log capturing."""
def __init__(self, item):
"""Creates a new funcarg."""
self._item = item
@property
def handler(self):
return self._item.catch_log_handler
@property
def text(self):
"""Returns the log text."""
return self.handler.stream.getvalue()
@property
def records(self):
"""Returns the list of log records."""
return self.handler.records
@property
def record_tuples(self):
"""Returns a list of a striped down version of log records intended
for use in assertion comparison.
The format of the tuple is:
(logger_name, log_level, message)
"""
return [(r.name, r.levelno, r.getMessage()) for r in self.records]
def clear(self):
"""Reset the list of log records."""
self.handler.records = []
def set_level(self, level, logger=None):
"""Sets the level for capturing of logs.
By default, the level is set on the handler used to capture
logs. Specify a logger name to instead set the level of any
logger.
"""
if logger is None:
logger = self.handler
else:
logger = logging.getLogger(logger)
logger.setLevel(level)
@contextmanager
def at_level(self, level, logger=None):
"""Context manager that sets the level for capturing of logs.
By default, the level is set on the handler used to capture
logs. Specify a logger name to instead set the level of any
logger.
"""
if logger is None:
logger = self.handler
else:
logger = logging.getLogger(logger)
orig_level = logger.level
logger.setLevel(level)
try:
yield
finally:
logger.setLevel(orig_level)
@pytest.fixture
def caplog(request):
"""Access and control log capturing.
Captured logs are available through the following methods::
* caplog.text() -> string containing formatted log output
* caplog.records() -> list of logging.LogRecord instances
* caplog.record_tuples() -> list of (logger_name, level, message) tuples
"""
return LogCaptureFixture(request.node)
def get_actual_log_level(config, *setting_names):
"""Return the actual logging level."""
for setting_name in setting_names:
log_level = config.getoption(setting_name)
if log_level is None:
log_level = config.getini(setting_name)
if log_level:
break
else:
return
if isinstance(log_level, six.string_types):
log_level = log_level.upper()
try:
return int(getattr(logging, log_level, log_level))
except ValueError:
# Python logging does not recognise this as a logging level
raise pytest.UsageError(
"'{0}' is not recognized as a logging level name for "
"'{1}'. Please consider passing the "
"logging level num instead.".format(
log_level,
setting_name))
def pytest_configure(config):
config.pluginmanager.register(LoggingPlugin(config),
'logging-plugin')
class LoggingPlugin(object):
"""Attaches to the logging module and captures log messages for each test.
"""
def __init__(self, config):
"""Creates a new plugin to capture log messages.
The formatter can be safely shared across all handlers so
create a single one for the entire test session here.
"""
self.log_cli_level = get_actual_log_level(
config, 'log_cli_level', 'log_level') or logging.WARNING
self.print_logs = get_option_ini(config, 'log_print')
self.formatter = logging.Formatter(
get_option_ini(config, 'log_format'),
get_option_ini(config, 'log_date_format'))
log_cli_handler = logging.StreamHandler(sys.stderr)
log_cli_format = get_option_ini(
config, 'log_cli_format', 'log_format')
log_cli_date_format = get_option_ini(
config, 'log_cli_date_format', 'log_date_format')
log_cli_formatter = logging.Formatter(
log_cli_format,
datefmt=log_cli_date_format)
self.log_cli_handler = log_cli_handler # needed for a single unittest
self.live_logs = catching_logs(log_cli_handler,
formatter=log_cli_formatter,
level=self.log_cli_level)
log_file = get_option_ini(config, 'log_file')
if log_file:
self.log_file_level = get_actual_log_level(
config, 'log_file_level') or logging.WARNING
log_file_format = get_option_ini(
config, 'log_file_format', 'log_format')
log_file_date_format = get_option_ini(
config, 'log_file_date_format', 'log_date_format')
self.log_file_handler = logging.FileHandler(
log_file,
# Each pytest runtests session will write to a clean logfile
mode='w')
log_file_formatter = logging.Formatter(
log_file_format,
datefmt=log_file_date_format)
self.log_file_handler.setFormatter(log_file_formatter)
else:
self.log_file_handler = None
@contextmanager
def _runtest_for(self, item, when):
"""Implements the internals of pytest_runtest_xxx() hook."""
with catching_logs(LogCaptureHandler(),
formatter=self.formatter) as log_handler:
item.catch_log_handler = log_handler
try:
yield # run test
finally:
del item.catch_log_handler
if self.print_logs:
# Add a captured log section to the report.
log = log_handler.stream.getvalue().strip()
item.add_report_section(when, 'log', log)
@pytest.hookimpl(hookwrapper=True)
def pytest_runtest_setup(self, item):
with self._runtest_for(item, 'setup'):
yield
@pytest.hookimpl(hookwrapper=True)
def pytest_runtest_call(self, item):
with self._runtest_for(item, 'call'):
yield
@pytest.hookimpl(hookwrapper=True)
def pytest_runtest_teardown(self, item):
with self._runtest_for(item, 'teardown'):
yield
@pytest.hookimpl(hookwrapper=True)
def pytest_runtestloop(self, session):
"""Runs all collected test items."""
with self.live_logs:
if self.log_file_handler is not None:
with closing(self.log_file_handler):
with catching_logs(self.log_file_handler,
level=self.log_file_level):
yield # run all the tests
else:
yield # run all the tests
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