Catch errors when connecting to database with Django loggers - django

Question

I wan't to log errors related to failed connection to the database. For example if I provide it an invalid URL I get the error
Traceback (most recent call last):
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
self.connect()
File "/home/vagrant/venv/lib/python3.6/site-packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 200, in connect
self.connection = self.get_new_connection(conn_params)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 187, in get_new_connection
connection = Database.connect(**conn_params)
File "/home/vagrant/venv/lib/python3.6/site-packages/psycopg2/__init__.py", line 122, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: could not translate host name "wrong-url.com" to address: Name or service not known
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
self.run()
File "/usr/lib/python3.6/threading.py", line 864, in run
self._target(*self._args, **self._kwargs)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/utils/autoreload.py", line 64, in wrapper
fn(*args, **kwargs)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 121, in inner_run
self.check_migrations()
File "/home/vagrant/venv/lib/python3.6/site-packages/django/core/management/base.py", line 486, in check_migrations
executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/migrations/executor.py", line 18, in __init__
self.loader = MigrationLoader(self.connection)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/migrations/loader.py", line 53, in __init__
self.build_graph()
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/migrations/loader.py", line 220, in build_graph
self.applied_migrations = recorder.applied_migrations()
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/migrations/recorder.py", line 77, in applied_migrations
if self.has_table():
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/migrations/recorder.py", line 55, in has_table
with self.connection.cursor() as cursor:
File "/home/vagrant/venv/lib/python3.6/site-packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 259, in cursor
return self._cursor()
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 235, in _cursor
self.ensure_connection()
File "/home/vagrant/venv/lib/python3.6/site-packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
self.connect()
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/utils.py", line 90, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
self.connect()
File "/home/vagrant/venv/lib/python3.6/site-packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 200, in connect
self.connection = self.get_new_connection(conn_params)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/home/vagrant/venv/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 187, in get_new_connection
connection = Database.connect(**conn_params)
File "/home/vagrant/venv/lib/python3.6/site-packages/psycopg2/__init__.py", line 122, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError: could not translate host name "wrong-url.com" to address: Name or service not known
For loggers I defined the following
"handlers": {
"console": {"level": "DEBUG", "class": "logging.StreamHandler", "formatter": "console"},
},
"loggers": {
"django": {"handlers": ["console"], "level": "INFO", "propagate": True},
"django.db": {"handlers": ["console"], "level": "INFO", "propagate": True},
"django.db.backends": {"handlers": ["console"], "level": "INFO", "propagate": True},
},
But sadly this doesn't capture exceptions when connecting to the database.
Sidenote: If I set level to DEBUG on the loggers, it does log all SQL queries so it's not a problem with the handler I believe.