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authorTomás Touceda <chiiph@leap.se>2013-07-12 12:26:42 -0300
committerTomás Touceda <chiiph@leap.se>2013-07-12 12:26:42 -0300
commit55f7638041a66cfd94baf49df947e71e50bedd3a (patch)
treed2dbef6b15e5f95e59259a61d28ffce316cc75a8 /src/leap/util
parent0ba84b70e18450e13b9270b552def941fb5cb0d6 (diff)
parente008d98a9407f3cd2ac4cee88c78c5c577bfaffe (diff)
Merge remote-tracking branch 'ivan/feature/3134_redirect-output-to-logger' into develop
Diffstat (limited to 'src/leap/util')
-rw-r--r--src/leap/util/streamtologger.py59
-rw-r--r--src/leap/util/tests/test_streamtologger.py122
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)