add support for logging configuration using a ini file. It uses the

standard Python logging's module Configuration file format
(http://docs.python.org/library/logging.html#configuration-file-format)
and allows anyone to use his custom file handler. Fix issues #117 and #111.

examples/logging.conf

@@ -0,0 +1,33 @@
+[loggers]
+keys=root, gunicorn
+
+[handlers]
+keys=console, file
+
+[formatters]
+keys=generic
+
+[logger_root]
+level=INFO
+handlers=console
+
+[logger_gunicorn]
+level=DEBUG
+handlers=file
+propagate=1
+qualname=gunicorn
+
+[handler_console]
+class=StreamHandler
+formatter=generic
+args=(sys.stdout, )
+
+[handler_file]
+class=logging.FileHandler
+formatter=generic
+args=('/tmp/test.log',)
+
+[formatter_generic]
+format="%(asctime)s [%(process)d] [%(levelname)s] %(message)s"
+datefmt="%Y-%m-%d %H:%M:%S"
+class=logging.Formatter

gunicorn/app/base.py

@@ -5,6 +5,7 @@
 
 import errno
 import logging
+import logging.config
 import os
 import sys
 import traceback
@@ -136,19 +137,25 @@ class Application(object):
         """
         self.logger = logging.getLogger('gunicorn')
 
-        handlers = []
-        if self.cfg.logfile != "-":
-            handlers.append(logging.FileHandler(self.cfg.logfile))
-        else:
-            handlers.append(logging.StreamHandler())
-
-        loglevel = self.LOG_LEVELS.get(self.cfg.loglevel.lower(), logging.INFO)
-        self.logger.setLevel(loglevel)
-        
-        format = r"%(asctime)s [%(process)d] [%(levelname)s] %(message)s"
+        fmt = r"%(asctime)s [%(process)d] [%(levelname)s] %(message)s"
         datefmt = r"%Y-%m-%d %H:%M:%S"
-        for h in handlers:
-            h.setFormatter(logging.Formatter(format, datefmt))
-            self.logger.addHandler(h)
+        if not self.cfg.logconfig:
+            handlers = []
+            if self.cfg.logfile != "-":
+                handlers.append(logging.FileHandler(self.cfg.logfile))
+            else:
+                handlers.append(logging.StreamHandler())
+
+            loglevel = self.LOG_LEVELS.get(self.cfg.loglevel.lower(), logging.INFO)
+            self.logger.setLevel(loglevel)
+            for h in handlers:
+                h.setFormatter(logging.Formatter(fmt, datefmt))
+                self.logger.addHandler(h)
+        else:
+            if os.path.exists(self.cfg.logconfig):
+                logging.config.fileConfig(self.cfg.logconfig)
+            else:
+                raise RuntimeError("Error: logfile '%s' not found." %
+                        self.cfg.logconfig)
 
 

gunicorn/config.py

@@ -548,6 +548,18 @@ class Loglevel(Setting):
         * error
         * critical
         """
+class LogConfig(Setting):
+    name = "logconfig"
+    section = "Logging"
+    cli = ["--log-config"]
+    meta = "FILE"
+    validator = validate_string
+    default = None 
+    desc = """\
+        The log config file to use. Gunicorn uses the standard Python \
+logging module's Configuration file format.
+        """
+
 
 class Procname(Setting):
     name = "proc_name"