PLAT-1350 Log Python warnings in production

cms/wsgi.py

+"""
+WSGI config for CMS.
+
+This module contains the WSGI application used by Django's development server
+and any production WSGI deployments.
+It exposes a module-level variable named ``application``. Django's
+``runserver`` and ``runfcgi`` commands discover this application via the
+``WSGI_APPLICATION`` setting.
+"""
+from __future__ import absolute_import
+
+from openedx.core.lib.logsettings import log_python_warnings
+log_python_warnings()
+
 # Patch the xml libs before anything else.
 from safe_lxml import defuse_xml_libs
 defuse_xml_libs()

lms/wsgi.py

@@ -7,6 +7,10 @@ It exposes a module-level variable named ``application``. Django's
 ``runserver`` and ``runfcgi`` commands discover this application via the
 ``WSGI_APPLICATION`` setting.
 """
+from __future__ import absolute_import
+
+from openedx.core.lib.logsettings import log_python_warnings
+log_python_warnings()
 
 # Patch the xml libs
 from safe_lxml import defuse_xml_libs

lms/wsgi_apache_lms.py

@@ -4,6 +4,10 @@ Apache WSGI file for LMS
 This module contains the WSGI application used for Apache deployment.
 It exposes a module-level variable named ``application``.
 """
+from __future__ import absolute_import
+
+from openedx.core.lib.logsettings import log_python_warnings
+log_python_warnings()
 
 # Patch the xml libs before anything else.
 from safe_lxml import defuse_xml_libs

manage.py

@@ -10,15 +10,21 @@ by passing the --settings flag, you can specify what environment specific settin
 
 Any arguments not understood by this manage.py will be passed to django-admin.py
 """
+# pylint: disable=wrong-import-order, wrong-import-position
+from __future__ import absolute_import, print_function
+
+from openedx.core.lib.logsettings import log_python_warnings
+log_python_warnings()
 
 # Patch the xml libs before anything else.
 from safe_lxml import defuse_xml_libs
 defuse_xml_libs()
 
+import importlib
 import os
 import sys
-import importlib
 from argparse import ArgumentParser
+
 import contracts
 
 
@@ -82,8 +88,8 @@ def parse_args():
     edx_args, django_args = parser.parse_known_args()
 
     if edx_args.help:
-        print "edX:"
-        print edx_args.help_string
+        print("edX:")
+        print(edx_args.help_string)
 
     return edx_args, django_args
 
@@ -104,7 +110,7 @@ if __name__ == "__main__":
         contracts.disable_all()
 
     if edx_args.help:
-        print "Django:"
+        print("Django:")
         # This will trigger django-admin.py to print out its help
         django_args.append('--help')
 

openedx/core/lib/logsettings.py

 """Get log settings."""
 
+import logging
 import os
 import platform
 import sys
+import warnings
 from logging.handlers import SysLogHandler
 
 LOG_LEVELS = ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']
@@ -161,3 +163,15 @@ def get_logger_config(log_dir,
         })
 
     return logger_config
+
+
+def log_python_warnings():
+    """
+    Stop ignoring DeprecationWarning, ImportWarning, and PendingDeprecationWarning;
+    log all Python warnings to the main log file.
+
+    Not used in test runs, so pytest can collect the warnings triggered for
+    each test case.
+    """
+    warnings.simplefilter('default')
+    logging.captureWarnings(True)