From 77524a333bf992a5691a573dbde68ca22d3712f0 Mon Sep 17 00:00:00 2001
From: Henrik Levkowetz <henrik@levkowetz.com>
Date: Fri, 12 Jun 2020 15:00:15 +0000
Subject: [PATCH] Added a management command to list registered loggers, in
 order to see which can be configured in settings_local with the
 UTILS_LOGGER_LEVELS settings.  - Legacy-Id: 17974

---
 ietf/utils/management/commands/showloggers.py | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 ietf/utils/management/commands/showloggers.py

diff --git a/ietf/utils/management/commands/showloggers.py b/ietf/utils/management/commands/showloggers.py
new file mode 100644
index 000000000..6f04dd454
--- /dev/null
+++ b/ietf/utils/management/commands/showloggers.py
@@ -0,0 +1,47 @@
+# Copyright The IETF Trust 2020, All Rights Reserved
+# -*- coding: utf-8 -*-
+
+import logging_tree
+import os
+
+from textwrap import dedent
+
+from django.core.management.base import BaseCommand
+
+import debug                            # pyflakes:ignore
+
+class Command(BaseCommand):
+    """
+    Display a list or tree representation of python loggers.<BR>
+
+    Add a UTILS_LOGGER_LEVELS setting in settings_local.py to configure
+    non-default logging levels for any registered logger, for instance:
+
+    UTILS_LOGGER_LEVELS = {
+        'oicd_provider': 'DEBUG',
+        'urllib3.connection': 'DEBUG',
+    }
+
+    """
+
+    help = dedent(__doc__).strip()
+
+    def add_arguments(self, parser):
+        parser.add_argument('--tree', action="store_true", default=False,
+            help='Only list loggers found, without showing the full tree.')
+
+    def handle(self, *filenames, **options):
+        if options.get('tree'):
+            self.stdout.write(logging_tree.format.build_description(node=None))
+        else:
+            self.stdout.write("Registered logging.Logger instances by name:")
+            def show(node):
+                if len(node) == 3:
+                    name, logger, nodes = node
+                    self.stdout.write("   %s" % (name or ''))
+                    for node in nodes:
+                        show(node)
+                else:
+                    self.stdout.write('Node: %s' % node)
+            show(logging_tree.tree())
+            self.stdout.write("\nUse '%s --tree' to show the full logger tree" % os.path.splitext(os.path.basename(__file__))[0])