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# -*- coding: latin-1 -*-
#
# Copyright (C) AB Strakt
# Copyright (C) Jean-Paul Calderone
# See LICENSE for details.

"""
Simple SSL client, using blocking I/O
"""

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#!/usr/bin/env python
#coding=utf-8
import socket
import os
import errno
from tornado.ioloop import IOLoop
from tornado.platform.auto import set_close_exec

class UDPServer(object):
    def __init__(self, io_loop=None):

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import select
import datetime

import psycopg2
import psycopg2.extensions

from sqlalchemy import create_engine, text

engine = create_engine("postgresql+psycopg2://vagrant@/postgres")

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Asynchronous programming with Tornado

Asynchronous programming can be tricky for beginners, therefore I think it's useful to iron some basic concepts to avoid common pitfalls.

For an explanation about generic asynchronous programming, I recommend you one of the [many][2] [resources][3] [online][4].

I will focus on solely on asynchronous programming in [Tornado][1]. From Tornado's homepage:

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"""Demo of streaming requests with Tornado.

This script features a client using AsyncHTTPClient's body_producer
feature to slowly produce a large request body, and two server
handlers to receive this body (one is a proxy that forwards to the
other, also using body_producer).

It also demonstrates flow control: if --client_delay is smaller than
--server_delay, the client will eventually be suspended to allow the
server to catch up. You can see this in the logs, as the "client

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import tornado.ioloop
import tornado.web
from tornado.options import options, define
from tornado.netutil import bind_unix_socket

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")
 
application = tornado.web.Application([

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# vim: fileencoding=utf-8
import time, signal
from tornado import web, ioloop, options, httpserver

_SHUTDOWN_TIMEOUT = 30

def make_safely_shutdown(server):
    io_loop = server.io_loop or ioloop.IOLoop.instance()
    def stop_handler(*args, **keywords):
        def shutdown():

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#!/bin/bash
# Copyright 2016, Rackspace US, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software

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CREATE OR REPLACE FUNCTION accountlogin(varusername character varying, varpassword character varying)
  RETURNS integer AS
$BODY$
DECLARE
	res RECORD;
BEGIN
	SELECT INTO res password, authority FROM account WHERE username = varusername;
	IF FOUND = FALSE THEN
		RETURN 2;
	ELSEIF res.password <> varpassword THEN