Refactor application startup.

Use Flask app config and remove package singletons

src/stacosys/interface/__init__.py

@@ -7,7 +7,6 @@ import background
 from flask import Flask
 
 from stacosys.db import dao
-from stacosys.service import config, mailer
 from stacosys.service.configuration import ConfigParameter
 
 app = Flask(__name__)
@@ -20,7 +19,7 @@ logger = logging.getLogger(__name__)
 
 @background.task
 def submit_new_comment(comment):
-    site_url = config.get(ConfigParameter.SITE_URL)
+    site_url = app.config['CONFIG'].get(ConfigParameter.SITE_URL)
     comment_list = (
         f"Web admin interface: {site_url}/web/admin",
         "",
@@ -35,9 +34,9 @@ def submit_new_comment(comment):
     email_body = "\n".join(comment_list)
 
     # send email to notify admin
-    site_name = config.get(ConfigParameter.SITE_NAME)
+    site_name = app.config['CONFIG'].get(ConfigParameter.SITE_NAME)
     subject = f"STACOSYS {site_name}"
-    if mailer.send(subject, email_body):
+    if app.config['MAILER'].send(subject, email_body):
         logger.debug("new comment processed")
         # save notification datetime
         dao.notify_comment(comment)

src/stacosys/interface/form.py

@@ -6,7 +6,6 @@ from flask import abort, redirect, request
 
 from stacosys.db import dao
 from stacosys.interface import app, submit_new_comment
-from stacosys.service import config
 from stacosys.service.configuration import ConfigParameter
 
 logger = logging.getLogger(__name__)
@@ -47,7 +46,7 @@ def new_form_comment():
     # send notification e-mail asynchronously
     submit_new_comment(comment)
 
-    return redirect(config.get(ConfigParameter.SITE_REDIRECT), code=302)
+    return redirect(app.config['CONFIG'].get(ConfigParameter.SITE_REDIRECT), code=302)
 
 
 def check_form_data(posted_comment):

src/stacosys/interface/web/admin.py

@@ -8,7 +8,6 @@ from flask import flash, redirect, render_template, request, session
 
 from stacosys.db import dao
 from stacosys.interface import app
-from stacosys.service import config, rss
 from stacosys.service.configuration import ConfigParameter
 
 logger = logging.getLogger(__name__)
@@ -25,8 +24,8 @@ def index():
 def is_login_ok(username, password):
     hashed = hashlib.sha256(password.encode()).hexdigest().upper()
     return (
-        config.get(ConfigParameter.WEB_USERNAME) == username
+        app.config['CONFIG'].get(ConfigParameter.WEB_USERNAME) == username
-        and config.get(ConfigParameter.WEB_PASSWORD) == hashed
+        and app.config['CONFIG'].get(ConfigParameter.WEB_PASSWORD) == hashed
     )
 
 
@@ -42,7 +41,7 @@ def login():
         flash("Identifiant ou mot de passe incorrect")
         return redirect("/web/login")
     # GET
-    return render_template("login_" + config.get(ConfigParameter.LANG) + ".html")
+    return render_template("login_" + app.config['CONFIG'].get(ConfigParameter.LANG) + ".html")
 
 
 @app.route("/web/logout", methods=["GET"])
@@ -55,7 +54,7 @@ def logout():
 def admin_homepage():
     if not (
         "user" in session
-        and session["user"] == config.get(ConfigParameter.WEB_USERNAME)
+        and session["user"] == app.config['CONFIG'].get(ConfigParameter.WEB_USERNAME)
     ):
         # TODO localization
         flash("Vous avez été déconnecté.")
@@ -63,9 +62,9 @@ def admin_homepage():
 
     comments = dao.find_not_published_comments()
     return render_template(
-        "admin_" + config.get(ConfigParameter.LANG) + ".html",
+        "admin_" + app.config['CONFIG'].get(ConfigParameter.LANG) + ".html",
         comments=comments,
-        baseurl=config.get(ConfigParameter.SITE_URL),
+        baseurl=app.config['CONFIG'].get(ConfigParameter.SITE_URL),
     )
 
 
@@ -77,7 +76,7 @@ def admin_action():
         flash("Commentaire introuvable")
     elif request.form.get("action") == "APPROVE":
         dao.publish_comment(comment)
-        rss.generate()
+        app.config['RSS'].generate()
         # TODO localization
         flash("Commentaire publié")
     else:

src/stacosys/run.py

@@ -9,55 +9,34 @@ import sys
 from stacosys.db import database
 from stacosys.interface import api, app, form
 from stacosys.interface.web import admin
-from stacosys.service import config, mailer, rss
+from stacosys.service.mail import Mailer
-from stacosys.service.configuration import ConfigParameter
+from stacosys.service.rssfeed import Rss
+from stacosys.service.configuration import Config, ConfigParameter
 
 
 # configure logging
-def configure_logging(level):
+def configure_logging() -> logging.Logger:
-    root_logger = logging.getLogger()
+    logging.basicConfig(level=logging.INFO, format="[%(asctime)s] %(name)s %(levelname)s %(message)s")
-    root_logger.setLevel(level)
-    handler = logging.StreamHandler()
-    handler.setLevel(level)
-    formatter = logging.Formatter("[%(asctime)s] %(name)s %(levelname)s %(message)s")
-    handler.setFormatter(formatter)
-    root_logger.addHandler(handler)
-
-
-def stacosys_server(config_pathname):
-    # configure logging
     logger = logging.getLogger(__name__)
-    configure_logging(logging.INFO)
     logging.getLogger("werkzeug").level = logging.WARNING
+    return logger
 
-    # check config file exists
+
+def load_and_validate_config(config_pathname: str, logger: logging.Logger) -> Config:
     if not os.path.isfile(config_pathname):
         logger.error("Configuration file '%s' not found.", config_pathname)
-        sys.exit(1)
+        raise FileNotFoundError(f"Configuration file '{config_pathname}' not found.")
 
-    # load and check config
+    config = Config()
     config.load(config_pathname)
-    is_config_ok, config_error = config.check()
+    if not config.check():
-    if not is_config_ok:
+        raise ValueError(f"Invalid configuration '{config_pathname}'")
-        logger.error("Invalid configuration '%s'", config_error)
+    logger.info("Configuration loaded successfully.")
-        sys.exit(1)
+    return config
-    logger.info(config)
-
-    # initialize database
-    database.configure(config.get(ConfigParameter.DB))
 
-    logger.info("Start Stacosys application")
-
-    # generate RSS
-    rss.configure(
-        config.get(ConfigParameter.RSS_FILE),
-        config.get(ConfigParameter.SITE_NAME),
-        config.get(ConfigParameter.SITE_PROTO),
-        config.get(ConfigParameter.SITE_URL),
-    )
-    rss.generate()
 
-    # configure mailer
+def configure_and_validate_mailer(config, logger):
+    mailer = Mailer()
     mailer.configure_smtp(
         config.get(ConfigParameter.SMTP_HOST),
         config.get_int(ConfigParameter.SMTP_PORT),
@@ -68,10 +47,34 @@ def stacosys_server(config_pathname):
     if not mailer.check():
         logger.error("Email configuration not working")
         sys.exit(1)
+    return mailer
 
-    logger.info("start interfaces %s %s %s", api, form, admin)
 
-    # start Flask
+def configure_rss(config):
+    rss = Rss()
+    rss.configure(
+        config.get(ConfigParameter.RSS_FILE),
+        config.get(ConfigParameter.SITE_NAME),
+        config.get(ConfigParameter.SITE_PROTO),
+        config.get(ConfigParameter.SITE_URL),
+    )
+    rss.generate()
+    return rss
+
+
+def main(config_pathname):
+    logger = configure_logging()
+    config = load_and_validate_config(config_pathname, logger)
+    database.configure(config.get(ConfigParameter.DB))
+
+    logger.info("Start Stacosys application")
+    rss = configure_rss(config)
+    mailer = configure_and_validate_mailer(config, logger)
+
+    logger.info("start interfaces %s %s %s", api, form, admin)
+    app.config['CONFIG'] = config
+    app.config['MAILER'] = mailer
+    app.config['RSS'] = rss
     app.run(
         host=config.get(ConfigParameter.HTTP_HOST),
         port=config.get_int(ConfigParameter.HTTP_PORT),
@@ -84,4 +87,8 @@ if __name__ == "__main__":
     parser = argparse.ArgumentParser()
     parser.add_argument("config", help="config path name")
     args = parser.parse_args()
-    stacosys_server(args.config)
+    try:
+        main(args.config)
+    except Exception as e:
+        logging.error(f"Failed to start application: {e}")
+        sys.exit(1)

src/stacosys/service/__init__.py

@@ -1,10 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-from .configuration import Config
-from .mail import Mailer
-from .rssfeed import Rss
-
-config = Config()
-mailer = Mailer()
-rss = Rss()