Issue 5013: Fixed bug in FileHandler when delay was set - added fix for...

Issue 5013: Fixed bug in FileHandler when delay was set - added fix for RotatingFileHandler and changed header comment slightly.

Lib/logging/__init__.py

@@ -18,7 +18,7 @@
 Logging package for Python. Based on PEP 282 and comments thereto in
 comp.lang.python, and influenced by Apache's log4j system.
 
-Copyright (C) 2001-2008 Vinay Sajip. All Rights Reserved.
+Copyright (C) 2001-2009 Vinay Sajip. All Rights Reserved.
 
 To use, simply 'import logging' and log away!
 """
@@ -43,8 +43,8 @@ except ImportError:
 
 __author__  = "Vinay Sajip <vinay_sajip@red-dove.com>"
 __status__  = "production"
-__version__ = "0.5.0.6"
-__date__    = "03 December 2008"
+__version__ = "0.5.0.7"
+__date__    = "20 January 2009"
 
 #---------------------------------------------------------------------------
 #   Miscellaneous module data
@@ -737,7 +737,6 @@ class StreamHandler(Handler):
         if strm is None:
             strm = sys.stderr
         self.stream = strm
-        self.formatter = None
 
     def flush(self):
         """
@@ -792,10 +791,12 @@ class FileHandler(StreamHandler):
         self.mode = mode
         self.encoding = encoding
         if delay:
+            #We don't open the stream, but we still need to call the
+            #Handler constructor to set level, formatter, lock etc.
+            Handler.__init__(self)
             self.stream = None
         else:
-            stream = self._open()
-            StreamHandler.__init__(self, stream)
+            StreamHandler.__init__(self, self._open())
 
     def close(self):
         """
@@ -827,8 +828,7 @@ class FileHandler(StreamHandler):
         constructor, open it before calling the superclass's emit.
         """
         if self.stream is None:
-            stream = self._open()
-            StreamHandler.__init__(self, stream)
+            self.stream = self._open()
         StreamHandler.emit(self, record)
 
 #---------------------------------------------------------------------------

Lib/logging/handlers.py

@@ -19,9 +19,9 @@ Additional handlers for the logging package for Python. The core package is
 based on PEP 282 and comments thereto in comp.lang.python, and influenced by
 Apache's log4j system.
 
-Copyright (C) 2001-2008 Vinay Sajip. All Rights Reserved.
+Copyright (C) 2001-2009 Vinay Sajip. All Rights Reserved.
 
-To use, simply 'import logging' and log away!
+To use, simply 'import logging.handlers' and log away!
 """
 
 import logging, socket, os, pickle, struct, time, re
@@ -112,7 +112,7 @@ class RotatingFileHandler(BaseRotatingHandler):
         """
         Do a rollover, as described in __init__().
         """
-
+        if self.stream:
             self.stream.close()
         if self.backupCount > 0:
             for i in range(self.backupCount - 1, 0, -1):
@@ -138,6 +138,8 @@ class RotatingFileHandler(BaseRotatingHandler):
         Basically, see if the supplied record would cause the file to exceed
         the size limit we have.
         """
+        if self.stream is None:                 # delay was set...
+            self.stream = self._open()
         if self.maxBytes > 0:                   # are we rolling over?
             msg = "%s\n" % self.format(record)
             self.stream.seek(0, 2)  #due to non-posix-compliant Windows feature
@@ -302,6 +304,7 @@ class TimedRotatingFileHandler(BaseRotatingHandler):
         then we have to get a list of matching filenames, sort them and remove
         the one with the oldest suffix.
         """
+        if self.stream:
             self.stream.close()
         # get the time that this sequence started at and make it a TimeTuple
         t = self.rolloverAt - self.interval

Misc/NEWS

@@ -137,6 +137,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #5013: Fixed a bug in FileHandler which occurred when the delay
+  parameter was set.
+
 - Issue #4842: Always append a trailing 'L' when pickling longs using
   pickle protocol 0.  When reading, the 'L' is optional.