Add a selective filter for leap logs.

Closes: #3504

2 files changed, 98 insertions, 0 deletions

diff --git a/src/leap/bitmask/util/leap_log_handler.py b/src/leap/bitmask/util/leap_log_handler.py
index 9adb21a5..98924c12 100644
--- a/src/leap/bitmask/util/leap_log_handler.py
+++ b/src/leap/bitmask/util/leap_log_handler.py
@@ -90,6 +90,9 @@ class HandlerAdapter(object):
     def setLevel(self, *args, **kwargs):
         return self._handler.setLevel(*args, **kwargs)
 
+    def addFilter(self, *args, **kwargs):
+        return self._handler.addFilter(*args, **kwargs)
+
     def handle(self, *args, **kwargs):
         return self._handler.handle(*args, **kwargs)
 
diff --git a/src/leap/bitmask/util/log_silencer.py b/src/leap/bitmask/util/log_silencer.py
new file mode 100644
index 00000000..09aa2cff
--- /dev/null
+++ b/src/leap/bitmask/util/log_silencer.py
@@ -0,0 +1,95 @@
+# -*- coding: utf-8 -*-
+# log_silencer.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/>.
+"""
+Filter for leap logs.
+"""
+import logging
+import os
+import re
+
+from leap.common.config import get_path_prefix
+
+
+class SelectiveSilencerFilter(logging.Filter):
+    """
+    Configurable filter for root leap logger.
+
+    If you want to ignore components from the logging, just add them,
+    one by line, to ~/.config/leap/leap.dev.conf
+    """
+    # TODO we can augment this by properly parsing the log-silencer file
+    # and having different sections: ignore, levels, ...
+
+    # TODO use ConfigParser to unify sections [log-ignore] [log-debug] etc
+
+    CONFIG_NAME = "leap.dev.conf"
+
+    # Components to be completely silenced in the main bitmask logs.
+    # You probably should think twice before adding a component to
+    # the tuple below. Only very well tested components should go here, and
+    # only in those cases in which we gain more from silencing them than from
+    # having their logs into the main log file that the user will likely send
+    # to us.
+    SILENCER_RULES = (
+        'leap.common.events',
+    )
+
+    def __init__(self, standalone=False):
+        """
+        Tries to load silencer rules from the default path,
+        or load from the SILENCER_RULES tuple if not found.
+        """
+        self.standalone = standalone
+        self.rules = None
+        if os.path.isfile(self._rules_path):
+            self.rules = self._load_rules()
+        if not self.rules:
+            self.rules = self.SILENCER_RULES
+
+    @property
+    def _rules_path(self):
+        """
+        The configuration file for custom ignore rules.
+        """
+        return os.path.join(
+            get_path_prefix(standalone=self.standalone),
+            "leap", self.CONFIG_NAME)
+
+    def _load_rules(self):
+        """
+        Loads a list of paths to be ignored from the logging.
+        """
+        lines = open(self._rules_path).readlines()
+        return map(lambda line: re.sub('\s', '', line),
+                   lines)
+
+    def filter(self, record):
+        """
+        Implements the filter functionality for this Filter
+
+        :param record: the record to be examined
+        :type record: logging.LogRecord
+        :returns: a bool indicating whether the record should be logged or not.
+        :rtype: bool
+        """
+        if not self.rules:
+            return True
+        logger_path = record.name
+        for path in self.rules:
+            if logger_path.startswith(path):
+                return False
+        return True