1 files changed, 47 insertions, 8 deletions
diff --git a/gn_auth/__init__.py b/gn_auth/__init__.py
index 6e2a884..d03c9ef 100644
--- a/gn_auth/__init__.py
+++ b/gn_auth/__init__.py
@@ -1,6 +1,8 @@
 """Application initialisation module."""
 import os
 import sys
+import logging
+import warnings
 from pathlib import Path
 from typing import Optional, Callable
 
@@ -17,15 +19,22 @@ from gn_auth.auth.authentication.oauth2.server import setup_oauth2_server
 from . import settings
 from .errors import register_error_handlers
 
+## Configure warnings: ##
+# https://docs.python.org/3/library/warnings.html#the-warnings-filter
+# filters form: (action, message, category, module, lineno)
+warnings.filterwarnings(action="always", category=DeprecationWarning)
+
+
 class ConfigurationError(Exception):
     """Raised in case of a configuration error."""
 
+
 def check_mandatory_settings(app: Flask) -> None:
     """Verify that mandatory settings are defined in the application"""
     undefined = tuple(
         setting for setting in (
             "SECRET_KEY", "SQL_URI", "AUTH_DB", "AUTH_MIGRATIONS",
-            "OAUTH2_SCOPE")
+            "OAUTH2_SCOPES_SUPPORTED")
         if not ((setting in app.config) and bool(app.config[setting])))
     if len(undefined) > 0:
         raise ConfigurationError(
@@ -52,27 +61,57 @@ def load_secrets_conf(app: Flask) -> None:
         app.config.from_pyfile(secretsfile)
 
 
-def create_app(
-        config: Optional[dict] = None,
-        setup_logging: Callable[[Flask], None] = lambda appl: None
-) -> Flask:
+def dev_loggers(appl: Flask) -> logging.Logger:
+    """Setup the logging handlers."""
+    stderr_handler = logging.StreamHandler(stream=sys.stderr)
+    appl.logger.addHandler(stderr_handler)
+    appl.logger.setLevel(appl.config["LOGLEVEL"])
+
+    return appl.logger
+
+
+def gunicorn_loggers(appl: Flask) -> logging.Logger:
+    """Use gunicorn logging handlers for the application."""
+    logger = logging.getLogger("gunicorn.error")
+    appl.logger.handlers = logger.handlers
+    appl.logger.setLevel(logger.level)
+    return appl.logger
+
+
+def setup_logging(appl: Flask, loggable_modules: tuple[str, ...] = tuple()) -> None:
+    """
+    Setup the loggers according to the WSGI server used to run the application.
+    """
+    # https://datatracker.ietf.org/doc/html/draft-coar-cgi-v11-03#section-4.1.17
+    # https://wsgi.readthedocs.io/en/latest/proposals-2.0.html#making-some-keys-required
+    # https://peps.python.org/pep-3333/#id4
+    software, *_version_and_comments = os.environ.get(
+        "SERVER_SOFTWARE", "").split('/')
+    logger = gunicorn_loggers(appl) if bool(software) else dev_loggers(appl)
+    for _logger in (
+            item for item in logger.manager.loggerDict.values()
+            if isinstance(item, logging.Logger)):
+        _logger.addFilter(lambda record: record.name in loggable_modules)
+
+
+def create_app(config: Optional[dict] = None) -> Flask:
     """Create and return a new flask application."""
     app = Flask(__name__)
 
     # ====== Setup configuration ======
     app.config.from_object(settings) # Default settings
-    # Override defaults with startup settings
-    app.config.update(config or {})
     # Override app settings with site-local settings
     if "GN_AUTH_CONF" in os.environ:
         app.config.from_envvar("GN_AUTH_CONF")
 
     override_settings_with_envvars(app)
 
+    # Override defaults with startup settings
+    app.config.update(config or {})
     load_secrets_conf(app)
     # ====== END: Setup configuration ======
 
-    setup_logging(app)
+    setup_logging(app, tuple(app.config.get("LOGGABLE_MODULES", [])))
     check_mandatory_settings(app)
 
     setup_oauth2_server(app)