tornado-server-example.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import logging
from tornado import httpserver, ioloop, netutil, process, web, options

# app's title
__title__ = 'Example'

options.define('port', default=8080, help='run on the given port', type=int)
options.define('logfile', default='./python-tornado-webserver.log', help='file to write log', type=str)
options.define('verbosity', default='INFO', help='log verbosity : CRITICAL, ERROR, WARNING, INFO, DEBUG', type=str)
options.parse_command_line(final=False)
logging.basicConfig(filename=options.options.logfile, level=options.options.verbosity)
logger = logging.getLogger(__name__)


def start_http(app: web.Application, http_port: int):
    http_socket = netutil.bind_sockets(http_port)  # HTTP socket
    try:  # try to create threads
        process.fork_processes(0)  # fork
    except KeyboardInterrupt:  # except KeyboardInterrupt to "properly" exit
        ioloop.IOLoop.current().stop()
    except AttributeError:  # OS without fork() support ...
        logging.warning('Can\' fork, continuing with only one (the main) thread ...')
        pass  #  do nothing and continue without multi-threading
    # bind http port
    logger.info('Start an HTTP request handler on port : ' + str(http_port))
    httpserver.HTTPServer(app).add_sockets(http_socket)
    try:
        ioloop.IOLoop.current().start()  # loop forever to satisfy user's requests
    except KeyboardInterrupt:  # except KeyboardInterrupt to "properly" exit
        ioloop.IOLoop.current().stop()


def main():
    # create an app instance
    application = web.Application([
            (r'/()', web.StaticFileHandler, {'path': './index.html'}),  # serve 'index.html' file from current directory at root URI
            (r'/(.*)', web.StaticFileHandler, {'path': './'}),  # serve a file from current directory at defined URI
        ])
    start_http(application, options.options.port)  # launch it in a new http server


if __name__ == '__main__':
    main()