From bfaf5d881f93446ccd14c9566a7c30b08eb26aa2 Mon Sep 17 00:00:00 2001
From: Benjamin Dauvergne <bdauvergne@entrouvert.com>
Date: Wed, 22 Jul 2015 13:45:16 +0200
Subject: [PATCH] add a custom logger class to make log level dynamic in
 LOGGING (fixes #7906)

A new logger class named DjangoLogger is created in hobo.logger, a
DebugLogLevel subclass of `int` is used to mark log level which should
change based upong a boolean Django setting. In
DjangoLogger.getEffectiveLevel() if the level found is a DebugLogLevel,
the corresponding setting is checked and if it is True, the DEBUG level
is returned.
---
 debian/debian_config_common.py |  9 ++++++---
 hobo/logger.py                 | 22 ++++++++++++++++++++++
 hobo/wsgi.py                   |  3 +++
 manage.py                      |  3 +++
 4 files changed, 34 insertions(+), 3 deletions(-)
 create mode 100644 hobo/logger.py

diff --git a/debian/debian_config_common.py b/debian/debian_config_common.py
index 6e1668c..aab7184 100644
--- a/debian/debian_config_common.py
+++ b/debian/debian_config_common.py
@@ -11,6 +11,8 @@
 import os
 from django.conf import global_settings
 
+import hobo.logger
+
 DEBUG = False
 TEMPLATE_DEBUG = False
 
@@ -40,7 +42,7 @@ LOGGING = {
     },
     'handlers': {
         'syslog': {
-            'level': 'INFO',
+            'level': 'DEBUG',
             'address': '/dev/log',
             'class': 'logging.handlers.SysLogHandler',
             'formatter': 'syslog',
@@ -58,7 +60,8 @@ LOGGING = {
     'loggers': {
         'django.db': {
             # even when debugging seeing SQL queries is too much
-            'level': 'INFO',
+            'level': hobo.logger.DebugLogLevel('INFO',
+                                               django_setting='DEBUG_DB'),
         },
         'django.request': {
             'level': 'ERROR',
@@ -71,7 +74,7 @@ LOGGING = {
             'propagate': False,
         },
         '': {
-            'level': 'INFO',
+            'level': hobo.logger.DebugLogLevel('INFO'),
             'handlers': ['syslog'],
         },
     },
diff --git a/hobo/logger.py b/hobo/logger.py
new file mode 100644
index 0000000..6b6d719
--- /dev/null
+++ b/hobo/logger.py
@@ -0,0 +1,22 @@
+import logging
+
+class DebugLogLevel(int):
+    def __new__(cls, level, django_setting='DEBUG'):
+        return super(DebugLogLevel, cls).__new__(cls, getattr(logging, level))
+
+    def __init__(self, level, django_setting='DEBUG'):
+        self.django_setting = django_setting
+        super(DebugLogLevel, self).__init__(getattr(logging, level))
+
+class DjangoLogger(logging.getLoggerClass()):
+    def getEffectiveLevel(self):
+        level = super(DjangoLogger, self).getEffectiveLevel()
+        if isinstance(level, DebugLogLevel):
+            from django.conf import settings
+            debug = getattr(settings, level.django_setting, False)
+            if debug:
+                return logging.DEBUG
+        return level
+
+logging.setLoggerClass(DjangoLogger)
+
diff --git a/hobo/wsgi.py b/hobo/wsgi.py
index 62ba97e..1365b21 100644
--- a/hobo/wsgi.py
+++ b/hobo/wsgi.py
@@ -10,5 +10,8 @@ https://docs.djangoproject.com/en/1.6/howto/deployment/wsgi/
 import os
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "hobo.settings")
 
+# set the LoggerClass to DjangoLogger
+import hobo.logger
+
 from django.core.wsgi import get_wsgi_application
 application = get_wsgi_application()
diff --git a/manage.py b/manage.py
index c84d3a0..984c4e0 100755
--- a/manage.py
+++ b/manage.py
@@ -2,6 +2,9 @@
 import os
 import sys
 
+# set the LoggerClass to DjangoLogger
+import hobo.logger
+
 if __name__ == "__main__":
     os.environ.setdefault("DJANGO_SETTINGS_MODULE", "hobo.settings")
 
-- 
2.1.4