Index: twisted/python/logfile.py
===================================================================
--- twisted/python/logfile.py	(revision 18009)
+++ twisted/python/logfile.py	(working copy)
@@ -9,7 +9,7 @@
 """
 
 # System Imports
-import os, glob, string, time
+import os, glob, string, time, gzip
 
 # sibling imports
 
@@ -151,7 +151,41 @@
 
 threadable.synchronize(LogFile)
 
+class GzipLogFile(LogFile):
+    def rotate(self):
+        if not (os.access(self.directory, os.W_OK) and os.access(self.path, os.W_OK)):
+            return
+        logs = self.listLogs()
+        logs.reverse()
+        for i in logs:
+            os.rename("%s.%d.gz" % (self.path, i), "%s.%d.gz" % (self.path, i + 1))
+        self._file.close()
 
+        newpath = "%s.1" % self.path
+        os.rename(self.path, newpath)
+        gz = gzip.open("%s.gz" % newpath, "wb")
+        newfp = open(newpath)
+        for l in newfp:
+            gz.write(l)
+        gz.close()
+        newfp.close()
+        os.remove(newpath)
+
+        self._openFile()
+
+    def listLogs(self):
+        """Return sorted list of integers - the old logs' identifiers."""
+        result = []
+        for name in glob.glob("%s.*" % self.path):
+            try:
+                counter = int(string.split(name, '.')[-2])
+                if counter:
+                    result.append(counter)
+            except ValueError:
+                pass
+        result.sort()
+        return result
+
 class DailyLogFile(BaseLogFile):
     """A log file that is rotated daily (at or after midnight localtime)
     """
Index: twisted/test/test_logfile.py
===================================================================
--- twisted/test/test_logfile.py	(revision 18009)
+++ twisted/test/test_logfile.py	(working copy)
@@ -6,7 +6,7 @@
 from twisted.trial import unittest
 
 # system imports
-import os, shutil, time
+import os, shutil, time, gzip
 
 # twisted imports
 from twisted.python import logfile
@@ -23,7 +23,6 @@
     
     def tearDown(self):
         shutil.rmtree(self.dir)
-        pass
     
     def testWriting(self):
         log = logfile.LogFile(self.name, self.dir)
@@ -158,7 +157,51 @@
         # reset permission so tearDown won't fail
         os.chmod(self.dir, 0777)
 
+class GzipLogFileTestCase(unittest.TestCase):
+    """Test the compressed rotating log file."""
+
+    def setUp(self):
+        self.dir = self.mktemp()
+        os.makedirs(self.dir)
+        self.name = "test.log"
+        self.path = os.path.join(self.dir, self.name)
+    
+    def tearDown(self):
+        #shutil.rmtree(self.dir)
+        pass
+
+    def testRotation(self):
+        # this logfile should rotate every 10 bytes
+        log = logfile.GzipLogFile(self.name, self.dir, rotateLength=10)
         
+        # test automatic rotation
+        log.write("123")
+        log.write("4567890")
+        log.write("1" * 11)
+        self.assert_(os.path.exists("%s.1.gz" % self.path))
+        g = gzip.open("%s.1.gz" % self.path)
+        self.assertEquals(g.read(), "1234567890")
+        g.close()
+        self.assert_(not os.path.exists("%s.2.gz" % self.path))
+        log.write('')
+        self.assert_(os.path.exists("%s.1.gz" % self.path))
+        self.assert_(os.path.exists("%s.2.gz" % self.path))
+        g = gzip.open("%s.1.gz" % self.path)
+        self.assertEquals(g.read(), "1" * 11)
+        g.close()
+        self.assert_(not os.path.exists("%s.3.gz" % self.path))
+        log.write("3")
+        self.assert_(not os.path.exists("%s.3.gz" % self.path))
+        
+        # test manual rotation
+        log.rotate()
+        self.assert_(os.path.exists("%s.3.gz" % self.path))
+        self.assert_(not os.path.exists("%s.4.gz" % self.path))
+        log.close()
+
+        self.assertEquals(log.listLogs(), [1, 2, 3])
+    
+ 
 class RiggedDailyLogFile(logfile.DailyLogFile):
     _clock = 0.0