CODEWITHSUNDEEP
pythongoogle-app-engine
probably at the beach
probably at the beach

Reputation: 15227

500 errors on appengine and console

I'm using Google Appengine in a production environment and we are currently getting 500 errors on both our website and console. Is there anything we can do to prevent these or handle them more gracefully?

EDIT: We're using python with Webapp

Upvotes: 2

Views: 345

Answers (1)

moraes
moraes

Reputation: 13649

  1. Setup error handlers: http://code.google.com/appengine/docs/python/config/appconfig.html#Custom_Error_Responses

  2. When the error occurs in the app, error handlers can't help. One solution is to wrap the application to handle uncaught exceptions:

    import logging

from google.appengine.ext import webapp
from google.appengine.ext.webapp import util

def error_handler_middleware(app):
    """Wraps the application to catch uncaught exceptions."""
    def wsgi_app(environ, start_response):
        try:
            return app(environ, start_response)
        except Exception, e:
            logging.exception(e)
            # ... display a custom error message ...
            response = webapp.Response()
            response.set_status(500)
            response.out.write('Ooops! An error occurred...')
            response.wsgi_write(start_response)
            return ['']

    return wsgi_app

app = webapp.WSGIApplication([...])
app = error_handler_middleware(app)

def main():
    util.run_wsgi_app(app)

if __name__ == '__main__':
    main()

  3. If you can, give webapp2 a try. You can set simple functions to handle app-wide exceptions.

Upvotes: 2

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