Running Flask with Gunicorn

flask_gunicorn_app.py

# coding: utf-8

# This gist shows how to integrate Flask into a 
# custom Gunicorn-WSGI application described
# here: http://docs.gunicorn.org/en/stable/custom.html

from __future__ import unicode_literals
import multiprocessing
import gunicorn.app.base
from gunicorn.six import iteritems
from gunicorn import util

import flask_app  
# # flask_app.py
# 
# import logging
# from flask import Flask
# 
# app = Flask(__name__)
# logger = logging.getLogger('gunicorn.error')
# stdout_handler = logging.StreamHandler()
# logger.addHandler(stdout_handler)
# 
# @app.route('/')
# def this_app():
#      return "<h3>Hello</h3>"
#
# if __name__ == '__main__':
#     app.run()


def number_of_workers():
    return (multiprocessing.cpu_count() * 2) + 1


class StandaloneApplication(gunicorn.app.base.BaseApplication):

    def __init__(self, app, options=None):
        self.options = options or {}
        self.application = app
        super(StandaloneApplication, self).__init__()

    def load_config(self):
        config = dict([(key, value) for key, value in iteritems(self.options)
                       if key in self.cfg.settings and value is not None])
        for key, value in iteritems(config):
            self.cfg.set(key.lower(), value)

    def load(self):
        return self.application

    def run(self):
        if self.cfg.daemon:
            util.daemonize(self.cfg.enable_stdio_inheritance)
        super(StandaloneApplication, self).run()

        
if __name__ == '__main__':
    log_format = logging.Formatter('%(asctime)s : %(message)s')
    
    file_handler = RotatingFileHandler('/var/log/gapi.log', maxBytes=2000, backupCount=5)
    file_handler.setFormatter(log_format)
    flask_app.logger.addHandler(file_handler)
    
    options = {
        'certfile': '/var/log/cert.crt',
        'keyfile': '/var/log/cert.key', 
        'workers': number_of_workers(),
        'bind': '%s:%s' % ('127.0.0.1', '35080'),
        'daemon': False,
    }
    
    app = flask_app.app
    StandaloneApplication(app, options).run()