diff options
Diffstat (limited to 'src/leap/util')
| -rw-r--r-- | src/leap/util/streamtologger.py | 59 | ||||
| -rw-r--r-- | src/leap/util/tests/test_streamtologger.py | 122 |
2 files changed, 181 insertions, 0 deletions
diff --git a/src/leap/util/streamtologger.py b/src/leap/util/streamtologger.py new file mode 100644 index 00000000..25a06718 --- /dev/null +++ b/src/leap/util/streamtologger.py @@ -0,0 +1,59 @@ +# -*- coding: utf-8 -*- +# streamtologger.py +# Copyright (C) 2013 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +""" +Stream object that redirects writes to a logger instance. +""" +import logging + + +class StreamToLogger(object): + """ + Fake file-like stream object that redirects writes to a logger instance. + + Credits to: + http://www.electricmonk.nl/log/2011/08/14/\ + redirect-stdout-and-stderr-to-a-logger-in-python/ + """ + def __init__(self, logger, log_level=logging.INFO): + """ + Constructor, defines the logger and level to use to log messages. + + :param logger: logger object to log messages. + :type logger: logging.Handler + :param log_level: the level to use to log messages through the logger. + :type log_level: int + look at logging-levels in 'logging' docs. + """ + self._logger = logger + self._log_level = log_level + + def write(self, data): + """ + Simulates the 'write' method in a file object. + It writes the data receibed in buf to the logger 'self._logger'. + + :param data: data to write to the 'file' + :type data: str + """ + for line in data.rstrip().splitlines(): + self._logger.log(self._log_level, line.rstrip()) + + def flush(self): + """ + Dummy method. Needed to replace the twisted.log output. + """ + pass diff --git a/src/leap/util/tests/test_streamtologger.py b/src/leap/util/tests/test_streamtologger.py new file mode 100644 index 00000000..4c98e562 --- /dev/null +++ b/src/leap/util/tests/test_streamtologger.py @@ -0,0 +1,122 @@ +# -*- coding: utf-8 -*- +# test_streamtologger.py +# Copyright (C) 2013 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +""" +tests for streamtologger +""" + +try: + import unittest2 as unittest +except ImportError: + import unittest + +import logging +import sys + +from leap.util.streamtologger import StreamToLogger +from leap.common.testing.basetest import BaseLeapTest + + +class SimpleLogHandler(logging.Handler): + """ + The simplest log handler that allows to check if the log was + delivered to the handler correctly. + """ + def __init__(self): + logging.Handler.__init__(self) + self._last_log = "" + self._last_log_level = "" + + def emit(self, record): + self._last_log = record.getMessage() + self._last_log_level = record.levelno + + def get_last_log(self): + """ + Returns the last logged message by this handler. + + :return: the last logged message. + :rtype: str + """ + return self._last_log + + def get_last_log_level(self): + """ + Returns the level of the last logged message by this handler. + + :return: the last logged level. + :rtype: str + """ + return self._last_log_level + + +class StreamToLoggerTest(BaseLeapTest): + """ + StreamToLogger's tests. + + NOTE: we may need to find a way to test the use case that an exception + is raised. I couldn't catch the output of an exception because the + test failed if some exception is raised. + """ + def setUp(self): + # Create the logger + level = logging.DEBUG + self.logger = logging.getLogger(name='test') + self.logger.setLevel(level) + + # Simple log handler + self.handler = SimpleLogHandler() + self.logger.addHandler(self.handler) + + # Preserve original values + self._sys_stdout = sys.stdout + self._sys_stderr = sys.stderr + + # Create the handler + sys.stdout = StreamToLogger(self.logger, logging.DEBUG) + sys.stderr = StreamToLogger(self.logger, logging.ERROR) + + def tearDown(self): + # Restore original values + sys.stdout = self._sys_stdout + sys.stderr = self._sys_stderr + + def test_logger_starts_empty(self): + self.assertEqual(self.handler.get_last_log(), '') + + def test_standard_output(self): + message = 'Test string' + print message + + log = self.handler.get_last_log() + log_level = self.handler.get_last_log_level() + + self.assertEqual(log, message) + self.assertEqual(log_level, logging.DEBUG) + + def test_standard_error(self): + message = 'Test string' + sys.stderr.write(message) + + log_level = self.handler.get_last_log_level() + log = self.handler.get_last_log() + + self.assertEqual(log, message) + self.assertEqual(log_level, logging.ERROR) + + +if __name__ == "__main__": + unittest.main(verbosity=2) |