Run code after flask application has started

by

If you need to execute some code after your flask application is started but strictly before the first request, not even be triggered by the execution of the first request as @app.before_first_request can handle, you should use Flask_Script, as CESCO said, but you could subclass the class Server and overwrite the __ call __ method, instead of overwriting the runserver command with @manager.command:

from flask import Flask
from flask_script import Manager, Server

def custom_call():
    #Your code
    pass

class CustomServer(Server):
    def __call__(self, app, *args, **kwargs):
        custom_call()
        #Hint: Here you could manipulate app
        return Server.__call__(self, app, *args, **kwargs)

app = Flask(__name__)
manager = Manager(app)

# Remeber to add the command to your Manager instance
manager.add_command('runserver', CustomServer())

if __name__ == "__main__":
    manager.run()

This way you don’t override default options of runserver command.

More Related Contents:

  1. How to return a dict as a JSON response from a Flask view?
  2. How to get POSTed JSON in Flask?
  3. Flask raises TemplateNotFound error even though template file exists
  4. Reference template variable within Jinja expression
  5. Is the server bundled with Flask safe to use in production?
  6. How many concurrent requests does a single Flask process receive?
  7. Handle Flask requests concurrently with threaded=True
  8. Make a POST request while redirecting in flask
  9. Saving upload in Flask only saves to project root
  10. redirect while passing arguments
  11. What is the purpose of Flask’s context stacks?
  12. error: [Errno 10053]
  13. Where should I place the secret key in Flask?
  14. Flask and uWSGI – unable to load app 0 (mountpoint=”) (callable not found or import error)
  15. RuntimeError: working outside of application context
  16. Flask throwing ‘working outside of request context’ when starting sub thread
  17. How to run Flask app with Tornado
  18. Get list of all routes defined in the Flask app
  19. Method Not Allowed flask error 405
  20. Extending Flask class as main App
  21. CSS Problems with Flask Web App
  22. Python Flask, how to set content type
  23. Flask URL Route: Route Several URLs to the same function
  24. how to get access to error message from abort command when using custom error handler
  25. Gunicorn can’t find app when name changed from “application”
  26. Flask(‘application’) versus Flask(__name__)
  27. Decoding base64 from POST to use in PIL
  28. ImportError: cannot import name ‘Markup’ from ‘jinja2’
  29. Handling large file uploads with Flask
  30. gcloud app deploy : This deployment has too many files

Leave a Comment