Using configparser instead of dynaconf to manage the settings

Makefile

@@ -8,14 +8,13 @@ local/install: generate-default-env-file
 	poetry install
 
 local/tests:
-	poetry run pytest --cov-report=html --cov-report=term --cov . 
+	poetry run pytest -s --cov-report=html --cov-report=term --cov . 
 
 local/lint:
 	poetry run ruff check .
-	poetry run ruff . --fix --exit-non-zero-on-fix
-
+
 local/lint/fix:
-	poetry run black .
+	poetry run ruff . --fix --exit-non-zero-on-fix
 
 local/run:
 	poetry run python src/main.py

README.md

@@ -9,7 +9,6 @@ A python boilerplate project using poetry
 - [Docker Compose](https://docs.docker.com/compose/) - **pre-requisite**
 - [Poetry](https://python-poetry.org/) - **pre-requisite**
 - [Ruff](https://github.com/astral-sh/ruff)
-- [Dynaconf](https://www.dynaconf.com/)
 
 *Please pay attention on **pre-requisites** resources that you must install/configure.*
 
@@ -40,3 +39,7 @@ run | `make docker/run` | `make local/run` | to run the project
 ## Logging
 
 This project uses a simple way to configure the log with [logging.conf](logging.conf) to show the logs on the container output console.
+
+## Settings
+
+This project uses a simple way to manage the settings with [settings.conf](settings.conf) and [ConfigParser](https://docs.python.org/3/library/configparser.html) using a [config class](./src/config/settings.py).

pyproject.toml

@@ -7,7 +7,6 @@ license = "MIT"
 
 [tool.poetry.dependencies]
 python = "^3.11"
-dynaconf = "3.2.3"
 
 [tool.poetry.dev-dependencies]
 pytest = "7.4.3"
@@ -16,6 +15,7 @@ ruff = "^0.0.291"
 
 [tool.pytest.ini_options]
 testpaths = ["tests",]
+pythonpath = ["src",]
 
 [tool.coverage.run]
 branch = true

settings.toml → settings.conf

@@ -1,4 +1,5 @@
 [default]
+app_name=python-boilerplate-project
 
 [development]
 

src/config/settings.py

@@ -1,8 +1,24 @@
-from dynaconf import Dynaconf
-
-settings = Dynaconf(
-    settings_files=["./settings.toml"],
-    environments=True,
-    load_dotenv=True,
-    env_switcher="ENV",
-)
+from configparser import ConfigParser
+from os import getenv
+from typing import Any
+
+
+class Settings:
+    __slots__ = ['config_parser', 'env']
+    config_parser: ConfigParser
+    env: str
+
+    def __init__(self, file: str = 'settings.conf'):
+        self.config_parser = ConfigParser()
+        self.config_parser.read(file)
+        self.env = getenv('ENV', 'development')
+
+    def get(self, name: str, default_value: Any = None) -> Any:
+        return self._get_from_section(self.env, name) or self._get_from_section('default', name) or default_value
+
+    def _get_from_section(self, section: str, var: str) -> Any:
+        if section in self.config_parser and var in self.config_parser[section]:
+            return self.config_parser[section][var]
+        return None
+
+settings = Settings()

src/main.py

@@ -1,12 +1,14 @@
 from logging import getLogger
 from logging.config import fileConfig as logConfig
 
+from config.settings import settings
+
 logConfig("./logging.conf", disable_existing_loggers=False)
 logger = getLogger(__name__)
 
 
 def hello() -> str:
-    logger.info("Hello")
+    logger.info(f"Hello from {settings.get('app_name')}")
     return "Hello"
 
 

tests/config/settings_to_test.conf

@@ -0,0 +1,17 @@
+[default]
+app_name=app-name
+app_var=default-app-var
+sample_of_int_var=10
+sample_of_float_var=10.10
+
+[development]
+app_var=development-app-var
+
+[test]
+app_var=test-app-var
+
+[qa]
+app_var=qa-app-var
+
+[prod]
+app_var=prod-app-var

tests/config/test_settings.py

@@ -0,0 +1,41 @@
+import os
+from unittest import TestCase, mock
+
+from src.config.settings import Settings
+
+
+class SettingsTest(TestCase):
+    def setUp(self) -> None:
+        self.settings = Settings(file='./tests/config/settings_to_test.conf')
+
+    def test_get_setting_value_with_success(self):
+        self.assertEqual(self.settings.get('app_name'), 'app-name')
+
+    def test_get_default_value_when_setting_not_found_with_success(self):
+        self.assertEqual(self.settings.get('not_found_var', 'default_value'), 'default_value')
+
+    def test_get_setting_int_value_with_success(self):
+        self.assertEqual(int(self.settings.get('sample_of_int_var')), 10)
+
+    def test_get_setting_float_value_with_success(self):
+        self.assertEqual(float(self.settings.get('sample_of_float_var')), 10.10)
+
+    @mock.patch.dict(os.environ, {'ENV': 'prod'}, clear=True)
+    def test_get_setting_value_from_production_env_with_success(self):
+        prod_settings = Settings(file='./tests/config/settings_to_test.conf')
+        self.assertEqual(prod_settings.get('app_var'), 'prod-app-var')
+
+    @mock.patch.dict(os.environ, {'ENV': 'qa'}, clear=True)
+    def test_get_setting_value_from_qa_env_with_success(self):
+        qa_settings = Settings(file='./tests/config/settings_to_test.conf')
+        self.assertEqual(qa_settings.get('app_var'), 'qa-app-var')
+
+    @mock.patch.dict(os.environ, {'ENV': 'test'}, clear=True)
+    def test_get_setting_value_from_test_env_with_success(self):
+        test_settings = Settings(file='./tests/config/settings_to_test.conf')
+        self.assertEqual(test_settings.get('app_var'), 'test-app-var')
+
+    @mock.patch.dict(os.environ, {'ENV': 'development'}, clear=True)
+    def test_get_setting_value_from_development_env_with_success(self):
+        dev_settings = Settings(file='./tests/config/settings_to_test.conf')
+        self.assertEqual(dev_settings.get('app_var'), 'development-app-var')