Simplify custom logging classes

No need to use meta programming to support dedent of text blocks on
message emission for simpler log messages.

Change-Id: Icacb1c2f422cb6035b6b93a21c90b8896f0ac79c

git_upstream/log.py

@@ -24,12 +24,9 @@ functions for verbose/quiet CLI args to retreive the appropriate level
 for logging output to the console.
 """
 
-from functools import wraps
 import logging
 import textwrap
 
-import six
-
 
 # Add new NOTICE logging level
 NOTICE = (logging.INFO + logging.WARN) // 2
@@ -37,17 +34,6 @@ logging.NOTICE = NOTICE
 logging.addLevelName(NOTICE, "NOTICE")
 
 
-def notice(self, msg, *args, **kwargs):
-    """
-    Supports same arguments as default methods available from
-    logging.Logger class
-    """
-    if self.isEnabledFor(NOTICE):
-        self._log(NOTICE, msg, args, **kwargs)
-
-logging.Logger.notice = notice
-
-
 def get_logger(name=None):
     """
     Wrapper for standard logging.getLogger that ensures all loggers in this
@@ -96,53 +82,21 @@ class LevelFilterIgnoreBelow(logging.Filter):
         return record.levelno >= self.level
 
 
-class DedentLoggerMeta(type):
-    """
-    Meta class to wrap all level functions in logging interface with dedent
-
-    Classes created from this should be derived from the logging.Logger class
-    as otherwise they will not contain the correct methods to be wrapped and
-    trying to pass them as the default class to create Loggers from will fail.
-    """
-
-    def __new__(cls, name, bases, dict):
-        # provide a more intelligent error instead of waiting for
-        # setattr/getattr adding of a wrapper function to fail
-        if logging.Logger not in bases:
-            raise TypeError("%s not derived from logging.Logger" % name)
-
-        obj = super(DedentLoggerMeta, cls).__new__(cls, name, bases, dict)
-        for levelalias in _levels:
-            level = levelalias[0]
-            aliases = levelalias[1:]
-            setattr(obj, level, cls.wrap()(getattr(obj, level)))
-            for alias in aliases:
-                setattr(obj, alias, getattr(obj, level))
-        setattr(obj, 'log', cls.wrap(True)(getattr(obj, 'log')))
-        return obj
-
-    @staticmethod
-    def wrap(with_level=False):
-        def dedentlog(func):
-            if with_level:
-                def _dedent_log(self, level, msg, *args, **kwargs):
-                    dedent = kwargs.pop('dedent', True)
-                    if dedent:
-                        msg = textwrap.dedent(msg.lstrip('\n'))
-                    func(self, level, msg, *args, **kwargs)
-            else:
-                def _dedent_log(self, msg, *args, **kwargs):
-                    dedent = kwargs.pop('dedent', True)
-                    if dedent:
-                        msg = textwrap.dedent(msg.lstrip('\n'))
-                    func(self, msg, *args, **kwargs)
-            return wraps(func)(_dedent_log)
-        return dedentlog
-
-
-@six.add_metaclass(DedentLoggerMeta)
 class DedentLogger(logging.Logger):
-    pass
+
+    def _log(self, level, msg, args, **kwargs):
+        dedent = kwargs.pop('dedent', True)
+        if dedent:
+            msg = textwrap.dedent(msg.lstrip('\n'))
+        super(DedentLogger, self)._log(level, msg, args, **kwargs)
+
+    def notice(self, msg, *args, **kwargs):
+        """
+        Supports same arguments as default methods available from
+        logging.Logger class
+        """
+        if self.isEnabledFor(NOTICE):
+            self._log(NOTICE, msg, args, **kwargs)
 
 
 # override default logger class for everything that imports this module
@@ -152,10 +106,10 @@ logging.setLoggerClass(DedentLogger)
 class LogDedentMixin(object):
 
     def __init__(self, *args, **kwargs):
-        self.__log = get_logger('%s.%s' % (__name__, self.__class__.__name__))
+        self._log = get_logger('%s.%s' % (__name__, self.__class__.__name__))
 
         super(LogDedentMixin, self).__init__(*args, **kwargs)
 
     @property
     def log(self):
-        return self.__log
+        return self._log