How to use only 'flask run' command in terminal and add default config variables in code i-CodePudding

I would like to start my Flask application with just flask run with these config informations: host = 0.0.0.0, port = 443 & cert = adhoc. If I wanted to run this through command I would have executed the code below instead:

flask run --host=0.0.0.0 --port=443 --cert=adhoc

But then I have to tell all my group mates and my professor to do it too when they check on my code. So I tried to work around this by using the code below in my app:

werkzeug.serving.run_simple("0.0.0.0", 443, app, ssl_context='adhoc')

However when I try to close my server with CTRL C, it starts another server that actually would start if I didn't have any config informations. So I was wondering is there any way to go around this? Either it is to continue using werkzeug or to change it to something else.

Here is a shorten version of my code that includes how I have built my app. Tried to include what's just needed. If there's anything I should include more just tell me. Any help is appreciated. Thank you!

def create_app(test_config=None):
    # create and configure the app
    app = Flask(__name__, instance_relative_config=True)

    app.config.from_mapping(
        SECRET_KEY='env',
        DATABASE=os.path.join(app.instance_path, 'flaskr.sqlite'),
    )    

    app.app_context().push()

    if test_config is None:
        # load the instance config, if it exists, when not testing
        app.config.from_pyfile('config.py', silent=True)
    else:
        # load the test config if passed in
        app.config.from_mapping(test_config)

    # ensure the instance folder exists
    try:
        os.makedirs(app.instance_path)
    except OSError:
        pass
   
    serving.run_simple("0.0.0.0", 443, app, ssl_context='adhoc')
    return app

CodePudding user response：

Environment variables would probably be the correct way to provide these values to the flask run command.

You never mentioned your platform, but on Linux, something like:

export FLASK_RUN_PORT=9999

Causes the dev sever to launch on port 9999 when launched with just flask run

You could also put these values in the file .flaskenv:

FLASK_RUN_PORT=9999
FLASK_RUN_HOST=0.0.0.0

flask run should then autoload these values.

By the way official documentation misses these values out, I had to look on issue 2661

Seems FLASK_RUN_CERT=adhoc is also a valid one, as per issue 3105.

Not sure if there's an extensive list of these anywhere.