bpo-30520: Implemented pickling for loggers. (#1956)

Implemented pickling for loggers.

1 files changed, 13 insertions, 2 deletions

diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py
index 4920383..64e24ee 100644
--- a/Lib/logging/__init__.py
+++ b/Lib/logging/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2001-2016 by Vinay Sajip. All Rights Reserved.
+# Copyright 2001-2017 by Vinay Sajip. All Rights Reserved.
 #
 # Permission to use, copy, modify, and distribute this software and its
 # documentation for any purpose and without fee is hereby granted,
@@ -18,7 +18,7 @@
 Logging package for Python. Based on PEP 282 and comments thereto in
 comp.lang.python.
 
-Copyright (C) 2001-2016 Vinay Sajip. All Rights Reserved.
+Copyright (C) 2001-2017 Vinay Sajip. All Rights Reserved.
 
 To use, simply 'import logging' and log away!
 """
@@ -1570,6 +1570,14 @@ class Logger(Filterer):
         level = getLevelName(self.getEffectiveLevel())
         return '<%s %s (%s)>' % (self.__class__.__name__, self.name, level)
 
+    def __reduce__(self):
+        # In general, only the root logger will not be accessible via its name.
+        # However, the root logger's class has its own __reduce__ method.
+        if getLogger(self.name) is not self:
+            import pickle
+            raise pickle.PicklingError('logger cannot be pickled')
+        return getLogger, (self.name,)
+
 
 class RootLogger(Logger):
     """
@@ -1583,6 +1591,9 @@ class RootLogger(Logger):
         """
         Logger.__init__(self, "root", level)
 
+    def __reduce__(self):
+        return getLogger, ()
+
 _loggerClass = Logger
 
 class LoggerAdapter(object):