Redirect output to the logger. Closes #3134.

Redirects:
    - the standard output
    - the standard error
    - the twisted log output
to the logger.

1 files changed, 59 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