Configure logging settings with environment variable and .ini config file.

Author: cc-wong

config.ini

@@ -0,0 +1,3 @@
+[Logging]
+log_level = INFO
+format = [%%(asctime)s] %%(levelname)s in %%(module)s: %%(message)s

flaskapp/.env

@@ -0,0 +1,2 @@
+LOG_LEVEL=DEBUG
+#LOG_LEVEL=WARN

flaskapp/__init__.py

@@ -1,27 +1,40 @@
 from flask import Flask
 from logging.config import dictConfig
 
+import configparser
+from dotenv import load_dotenv
+import os
+
 
 def create_app():
     """
     The application factory.
     """
 
+    load_dotenv()
+
+    config = configparser.ConfigParser()
+    config.read('config.ini')
+
+    log_level = os.environ.get('LOG_LEVEL', config['Logging'].get('log_level'))
+    log_format = config['Logging'].get('format')
+
     dictConfig({
         'version': 1,
         'formatters': {'default': {
-            'format': '[%(asctime)s] %(levelname)s in %(module)s: %(message)s',
+            'format': log_format,
         }},
         'handlers': {'wsgi': {
             'class': 'logging.StreamHandler',
             'stream': 'ext://flask.logging.wsgi_errors_stream',
             'formatter': 'default'
         }},
         'root': {
-            'level': 'INFO',
+            'level': log_level,
             'handlers': ['wsgi']
         }
     })
 
     app = Flask(__name__)
+    app.logger.debug(f'Configurations:-\nLog level: {log_level}\nLog format: {log_format}')
     return app

requirements.txt

@@ -9,4 +9,5 @@ MarkupSafe==2.1.3
 psycopg2-binary==2.9.6
 Werkzeug==2.3.6
 swagger-ui-py==23.9.23
-gunicorn==21.0.1
+gunicorn==21.0.1
+python_dotenv==1.0.1