bitbake: toaster: SQL query logging

We add a logger, enabled through the settings.py, that
logs all SQL queries, with timestamp and duration, to console.

This is helpful in profiling the SQL queries.

The facility is disabled by default.

(Bitbake rev: 54fd0a76fa3154adfab5688ecc96963f42cded11)

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/toastermain/settings.py

@@ -24,6 +24,10 @@
 DEBUG = True
 TEMPLATE_DEBUG = DEBUG
 
+# Set to True to see the SQL queries in console
+SQL_DEBUG = False
+
+
 ADMINS = (
     # ('Your Name', 'your_email@example.com'),
 )
@@ -276,11 +280,21 @@ LOGGING = {
             '()': 'django.utils.log.RequireDebugFalse'
         }
     },
+    'formatters': {
+        'datetime': {
+            'format': 'DB %(asctime)s %(message)s'
+        }
+    },
     'handlers': {
         'mail_admins': {
             'level': 'ERROR',
             'filters': ['require_debug_false'],
             'class': 'django.utils.log.AdminEmailHandler'
+        },
+        'console': {
+            'level': 'DEBUG',
+            'class': 'logging.StreamHandler',
+            'formatter': 'datetime',
         }
     },
     'loggers': {
@@ -292,6 +306,13 @@ LOGGING = {
     }
 }
 
+if DEBUG and SQL_DEBUG:
+    LOGGING['loggers']['django.db.backends'] = {
+            'level': 'DEBUG',
+            'handlers': ['console'],
+        }
+
+
 # If we're using sqlite, we need to tweak the performance a bit
 from django.db.backends.signals import connection_created
 def activate_synchronous_off(sender, connection, **kwargs):