Factorize application creation logic

ihatemoney/manage.py

@@ -5,7 +5,7 @@ from flask_script import Manager, Command
 from flask_migrate import Migrate, MigrateCommand
 from werkzeug.security import generate_password_hash
 
-from ihatemoney.run import app
+from ihatemoney.run import create_app
 from ihatemoney.models import db
 
 
@@ -16,16 +16,15 @@ class GeneratePasswordHash(Command):
         password = getpass(prompt='Password: ')
         print(generate_password_hash(password))
 
+
+def main():
+    app = create_app()
     migrate = Migrate(app, db)
 
     manager = Manager(app)
     manager.add_command('db', MigrateCommand)
     manager.add_command('generate_password_hash', GeneratePasswordHash)
-
-
-def main():
     manager.run()
 
-
 if __name__ == '__main__':
     main()

ihatemoney/run.py

@@ -4,20 +4,22 @@ import warnings
 
 from flask import Flask, g, request, session
 from flask_babel import Babel
+from flask_mail import Mail
 from flask_migrate import Migrate, upgrade, stamp
 from raven.contrib.flask import Sentry
 
-from ihatemoney.web import main, db, mail
 from ihatemoney.api import api
+from ihatemoney.models import db
 from ihatemoney.utils import PrefixedWSGI
-from ihatemoney.utils import minimal_round
+from ihatemoney.web import main as web_interface
 
 from ihatemoney import default_settings
 
-app = Flask(__name__, instance_path='/etc/ihatemoney', instance_relative_config=True)
 
+def setup_database(app):
+    """Prepare the database. Create tables, run migrations etc."""
 
-def pre_alembic_db():
+    def _pre_alembic_db():
         """ Checks if we are migrating from a pre-alembic ihatemoney
         """
         con = db.engine.connect()
@@ -25,8 +27,23 @@ def pre_alembic_db():
         alembic_setup = db.engine.dialect.has_table(con, 'alembic_version')
         return tables_exist and not alembic_setup
 
+    db.init_app(app)
+    db.app = app
 
-def configure():
+    Migrate(app, db)
+    migrations_path = os.path.join(app.root_path, 'migrations')
+
+    if _pre_alembic_db():
+        with app.app_context():
+            # fake the first migration
+            stamp(migrations_path, revision='b9a10d5d63ce')
+
+    # auto-execute migrations on runtime
+    with app.app_context():
+        upgrade(migrations_path)
+
+
+def load_configuration(app):
     """ A way to (re)configure the app, specially reset the settings
     """
     default_config_file = os.path.join(app.root_path, 'default_settings.py')
@@ -43,6 +60,9 @@ def configure():
         app.config.from_pyfile('ihatemoney.cfg', silent=True)
     app.wsgi_app = PrefixedWSGI(app)
 
+
+def validate_configuration(app):
+
     if app.config['SECRET_KEY'] == default_settings.SECRET_KEY:
         warnings.warn(
             "Running a server without changing the SECRET_KEY can lead to"
@@ -57,8 +77,8 @@ def configure():
             + " and will be removed in further version",
             UserWarning
         )
-        if not 'MAIL_DEFAULT_SENDER' in app.config:
+        if 'MAIL_DEFAULT_SENDER' not in app.config:
-            app.config['MAIL_DEFAULT_SENDER'] = DEFAULT_MAIL_SENDER
+            app.config['MAIL_DEFAULT_SENDER'] = default_settings.DEFAULT_MAIL_SENDER
 
     if "pbkdf2:sha256:" not in app.config['ADMIN_PASSWORD'] and app.config['ADMIN_PASSWORD']:
         # Since 2.0
@@ -71,41 +91,28 @@ def configure():
             UserWarning
         )
 
-configure()
 
-
+def create_app(instance_path='/etc/ihatemoney'):
-app.register_blueprint(main)
+    app = Flask(__name__, instance_path=instance_path,
+                instance_relative_config=True)
+    load_configuration(app)
+    validate_configuration(app)
+    app.register_blueprint(web_interface)
     app.register_blueprint(api)
 
-# custom jinja2 filters
+    # Configure the application
-app.jinja_env.filters['minimal_round'] = minimal_round
+    setup_database(app)
 
-# db
+    mail = Mail()
-db.init_app(app)
-db.app = app
-
-# db migrations
-migrate = Migrate(app, db)
-migrations_path = os.path.join(app.root_path, 'migrations')
-
-if pre_alembic_db():
-    with app.app_context():
-        # fake the first migration
-        stamp(migrations_path, revision='b9a10d5d63ce')
-
-# auto-execute migrations on runtime
-with app.app_context():
-    upgrade(migrations_path)
-
-# mail
     mail.init_app(app)
+    app.mail = mail
 
-# translations
+    # Error reporting
+    Sentry(app)
+
+    # Translations
     babel = Babel(app)
 
-# sentry
-sentry = Sentry(app)
-
     @babel.localeselector
     def get_locale():
         # get the lang from the session if defined, fallback on the browser "accept
@@ -114,7 +121,11 @@ def get_locale():
         setattr(g, 'lang', lang)
         return lang
 
+    return app
+
+
 def main():
+    app = create_app()
     app.run(host="0.0.0.0", debug=True)
 
 if __name__ == '__main__':

ihatemoney/web.py

@@ -13,10 +13,9 @@ from flask import (
     Blueprint, current_app, flash, g, redirect, render_template, request,
     session, url_for, send_file
 )
-from flask_mail import Mail, Message
+from flask_mail import Message
 from flask_babel import get_locale, gettext as _
-from werkzeug.security import generate_password_hash, \
+from werkzeug.security import check_password_hash
-     check_password_hash
 from smtplib import SMTPRecipientsRefused
 import werkzeug
 from sqlalchemy import orm
@@ -31,7 +30,6 @@ from ihatemoney.forms import (
 from ihatemoney.utils import Redirect303, list_of_dicts2json, list_of_dicts2csv
 
 main = Blueprint("main", __name__)
-mail = Mail()
 
 
 def requires_admin(f):
@@ -337,7 +335,7 @@ def invite():
                 body=message_body,
                 recipients=[email.strip()
                     for email in form.emails.data.split(",")])
-            mail.send(msg)
+            current_app.mail.send(msg)
             flash(_("Your invitations have been sent"))
             return redirect(url_for(".list_bills"))