run.py

import logging
import multiprocessing

import gunicorn.app.base
from gunicorn.six import iteritems

from app import configure, create_app
from app.config import parser, settings
from app.storage.mongo_storage import MongoStorage

gunicorn.SERVER_SOFTWARE = 'gunicorn'  # hide gunicorn version


class Application(gunicorn.app.base.BaseApplication):
    def __init__(self, app, options=None):
        self.options = options or {}
        self.application = app
        super(Application, 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 init_app():
    args = vars(parser.parse_args())
    configure(**args)
    return create_app()


def _post_fork(server=None, w=None):
    # Setup database connection
    # Connect to mongo_db after forking gunicorn
    MongoStorage(db_name=settings.get('db_name'), mongo_uri=settings.get('mongo_uri'))

    _config_logging()


def _config_logging():
    for logger in 'gunicorn.access', 'gunicorn.error':
        logging.getLogger(logger).propagate = True
        logging.getLogger(logger).handlers = []


if __name__ == '__main__':
    app = init_app()
    env_name = settings.get("ENV_NAME")
    default_workers = (multiprocessing.cpu_count() * 2) + 1
    opts = {
        "accesslog": settings.get("ACCESS_LOG"),
        "access_log_format": settings.get("ACCESS_LOG_FORMAT"),
        "bind": settings.get("BIND"),
        "errorlog": settings.get("ERROR_LOG"),
        "keepalive": settings.get("KEEP_ALIVE"),
        "post_fork": _post_fork,
        "proc_name": settings.get("APP_NAME"),
        "max_requests": settings.get("MAX_REQUESTS"),
        "max_requests_jitter": settings.get("MAX_REQUESTS_JITTER"),
        "worker_class": settings.get("WORKER_CLASS"),
        "workers": settings.get("WORKERS") or (1 if env_name == "LOCAL"
                                               else default_workers),
        # DEV configuration
        "reload": settings.get("RELOAD"),
        "timeout": settings.get("TIMEOUT"),
        "graceful-timeout": settings.get("GRACEFUL-TIMEOUT")
    }
    Application(app, opts).run()