This plugin captures logging statements issued during test execution. When an error or failure occurs, the captured log messages are attached to the running test in the test.capturedLogging attribute, and displayed with the error failure output. It is enabled by default but can be turned off with the option --nologcapture.
You can filter captured logging statements with the --logging-filter option. If set, it specifies which logger(s) will be captured; loggers that do not match will be passed. Example: specifying --logging-filter=sqlalchemy,myapp will ensure that only statements logged via sqlalchemy.engine, myapp or myapp.foo.bar logger will be logged.
You can remove other installed logging handlers with the --logging-clear-handlers option.
Bases: nose.plugins.base.Plugin
Log capture plugin. Enabled by default. Disable with –nologcapture. This plugin captures logging statements issued during test execution, appending any output captured to the error or failure output, should the test fail or raise an error.
"""
This plugin captures logging statements issued during test execution. When an
error or failure occurs, the captured log messages are attached to the running
test in the test.capturedLogging attribute, and displayed with the error failure
output. It is enabled by default but can be turned off with the option
``--nologcapture``.
You can filter captured logging statements with the ``--logging-filter`` option.
If set, it specifies which logger(s) will be captured; loggers that do not match
will be passed. Example: specifying ``--logging-filter=sqlalchemy,myapp``
will ensure that only statements logged via sqlalchemy.engine, myapp
or myapp.foo.bar logger will be logged.
You can remove other installed logging handlers with the
``--logging-clear-handlers`` option.
"""
import logging
from logging.handlers import BufferingHandler
from nose.plugins.base import Plugin
from nose.util import ln, safe_str
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
log = logging.getLogger(__name__)
class MyMemoryHandler(BufferingHandler):
def __init__(self, capacity, logformat, logdatefmt, filters):
BufferingHandler.__init__(self, capacity)
fmt = logging.Formatter(logformat, logdatefmt)
self.setFormatter(fmt)
self.filters = filters
def flush(self):
pass # do nothing
def truncate(self):
self.buffer = []
def filter(self, record):
"""Our custom record filtering logic.
Built-in filtering logic (via logging.Filter) is too limiting.
"""
if not self.filters:
return True
matched = False
rname = record.name # shortcut
for name in self.filters:
if rname == name or rname.startswith(name+'.'):
matched = True
return matched
class LogCapture(Plugin):
"""
Log capture plugin. Enabled by default. Disable with --nologcapture.
This plugin captures logging statements issued during test execution,
appending any output captured to the error or failure output,
should the test fail or raise an error.
"""
enabled = True
env_opt = 'NOSE_NOLOGCAPTURE'
name = 'logcapture'
score = 500
logformat = '%(name)s: %(levelname)s: %(message)s'
logdatefmt = None
clear = False
filters = []
def options(self, parser, env):
"""Register commandline options.
"""
parser.add_option(
"--nologcapture", action="store_false",
default=not env.get(self.env_opt), dest="logcapture",
help="Disable logging capture plugin. "
"Logging configurtion will be left intact."
" [NOSE_NOLOGCAPTURE]")
parser.add_option(
"--logging-format", action="store", dest="logcapture_format",
default=env.get('NOSE_LOGFORMAT') or self.logformat,
metavar="FORMAT",
help="Specify custom format to print statements. "
"Uses the same format as used by standard logging handlers."
" [NOSE_LOGFORMAT]")
parser.add_option(
"--logging-datefmt", action="store", dest="logcapture_datefmt",
default=env.get('NOSE_LOGDATEFMT') or self.logdatefmt,
metavar="FORMAT",
help="Specify custom date/time format to print statements. "
"Uses the same format as used by standard logging handlers."
" [NOSE_LOGDATEFMT]")
parser.add_option(
"--logging-filter", action="store", dest="logcapture_filters",
default=env.get('NOSE_LOGFILTER'),
metavar="FILTER",
help="Specify which statements to filter in/out. "
"By default, everything is captured. If the output is too"
" verbose,\nuse this option to filter out needless output.\n"
"Example: filter=foo will capture statements issued ONLY to\n"
" foo or foo.what.ever.sub but not foobar or other logger.\n"
"Specify multiple loggers with comma: filter=foo,bar,baz."
" [NOSE_LOGFILTER]\n")
parser.add_option(
"--logging-clear-handlers", action="store_true",
default=False, dest="logcapture_clear",
help="Clear all other logging handlers")
def configure(self, options, conf):
"""Configure plugin.
"""
self.conf = conf
# Disable if explicitly disabled, or if logging is
# configured via logging config file
if not options.logcapture or conf.loggingConfig:
self.enabled = False
self.logformat = options.logcapture_format
self.logdatefmt = options.logcapture_datefmt
self.clear = options.logcapture_clear
if options.logcapture_filters:
self.filters = options.logcapture_filters.split(',')
def setupLoghandler(self):
# setup our handler with root logger
root_logger = logging.getLogger()
if self.clear:
for logger in logging.Logger.manager.loggerDict.values():
if hasattr(logger, "handlers"):
for handler in logger.handlers:
logger.removeHandler(handler)
# make sure there isn't one already
# you can't simply use "if self.handler not in root_logger.handlers"
# since at least in unit tests this doesn't work --
# LogCapture() is instantiated for each test case while root_logger
# is module global
# so we always add new MyMemoryHandler instance
for handler in root_logger.handlers[:]:
if isinstance(handler, MyMemoryHandler):
root_logger.handlers.remove(handler)
root_logger.addHandler(self.handler)
# to make sure everything gets captured
root_logger.setLevel(logging.NOTSET)
def begin(self):
"""Set up logging handler before test run begins.
"""
self.start()
def start(self):
self.handler = MyMemoryHandler(1000, self.logformat, self.logdatefmt,
self.filters)
self.setupLoghandler()
def end(self):
pass
def beforeTest(self, test):
"""Clear buffers and handlers before test.
"""
self.setupLoghandler()
def afterTest(self, test):
"""Clear buffers after test.
"""
self.handler.truncate()
def formatFailure(self, test, err):
"""Add captured log messages to failure output.
"""
return self.formatError(test, err)
def formatError(self, test, err):
"""Add captured log messages to error output.
"""
# logic flow copied from Capture.formatError
test.capturedLogging = records = self.formatLogRecords()
if not records:
return err
ec, ev, tb = err
return (ec, self.addCaptureToErr(ev, records), tb)
def formatLogRecords(self):
format = self.handler.format
return [safe_str(format(r)) for r in self.handler.buffer]
def addCaptureToErr(self, ev, records):
return '\n'.join([safe_str(ev), ln('>> begin captured logging <<')] + \
records + \
[ln('>> end captured logging <<')])