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app.py
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app.py
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# coding=UTF-8
# General modules.
import os, os.path
import logging
import sys
from threading import Timer
import string
import random
# Tornado modules.
import tornado.ioloop
import tornado.web
import tornado.websocket
import tornado.auth
import tornado.options
import tornado.escape
from tornado import gen
# Redis modules.
import brukva
# Import application modules.
from base import BaseHandler
from auth import LoginHandler
from auth import LogoutHandler
# Import Bot.
from bot import Bot
import feedparser
import urllib
import urllib2
import requests
from lxml import html
import duckduckgo
# Define port from command line parameter.
tornado.options.define("port", default=8888, help="run on the given port", type=int)
class MainHandler(BaseHandler):
"""
Main request handler for the root path and for chat rooms.
"""
@tornado.web.asynchronous
def get(self, room=None):
if not room:
self.redirect("/room/main")
return
# Set chat room as instance var (should be validated).
self.room = str(room)
# Get the current user.
self._get_current_user(callback=self.on_auth)
def on_auth(self, user):
if not user:
# Redirect to login if not authenticated.
self.redirect("/login")
return
# Load 50 latest messages from this chat room.
if self.room != 'help':
self.application.client.lrange(self.room, -50, -1, self.on_conversation_found)
else:
content = ('<h2>Instructions</h2>'
+ '<div>'
+ '<p>There are 3 base rooms in Chat: Main, Rooms, Help. You can`t write in Rooms and Help.</p>'
+ '<p>If you want to change/create room you have to change url in your browser, after "http..../room/newroom"</p>'
+ '<p>There is command Bot in Chat. You can`t take name "Bot" but can give him commands.</p>'
+ '<p>!news - Bot will write 10 last news from news.ycombinator.com</p>'
+ '<p>!duck word - write 10 search resuts this word by duckduckgo</p>'
+ '<p>!sum numb1 numb2 ... - write sum=numb1+numb2...</p>'
+ '<p>!mean numb1 numb2 ... - write mean of this numbers</p>'
+ '</div>')
self.render_default("index.html", content=content)
def on_conversation_found(self, result):
if isinstance(result, Exception):
raise tornado.web.HTTPError(500)
# JSON-decode messages.
messages = []
for message in result:
messages.append(tornado.escape.json_decode(message))
# Render template and deliver website.
content = self.render_string("messages.html", messages=messages)
self.render_default("index.html", content=content, chat=1)
class ChatSocketHandler(tornado.websocket.WebSocketHandler):
"""
Handler for dealing with websockets. It receives, stores and distributes new messages.
TODO: Not proper authentication handling!
"""
@gen.engine
def open(self, room='root'):
"""
Called when socket is opened. It will subscribe for the given chat room based on Redis Pub/Sub.
"""
# Check if room is set.
if not room:
self.write_message({'error': 1, 'textStatus': 'Error: No room specified'})
self.close()
return
self.room = str(room)
self.new_message_send = False
# Create a Redis connection.
self.client = redis_connect()
# Subscribe to the given chat room.
self.client.subscribe(self.room)
self.subscribed = True
self.client.listen(self.on_messages_published)
logging.info('New user connected to chat room ' + room)
if room != 'main' and room != 'rooms':
message = {
'_id': ''.join(random.choice(string.ascii_uppercase) for i in range(12)),
'from': 'Bot',
'body': self.application.usernames[self.get_secure_cookie('user')] + ' went to ' + room,
}
try:
# Convert to JSON-literal.
message_encoded = tornado.escape.json_encode(message)
# Persistently store message in Redis.
self.application.client.rpush('rooms', message_encoded)
# Publish message in Redis channel.
self.application.client.publish('rooms', message_encoded)
except Exception, err:
e = str(sys.exc_info()[0])
#Send an error back to client.
self.write_message({'error': 1, 'textStatus': 'Error writing to database: ' + str(err)})
return
# Send message through the socket to indicate a successful operation.
self.write_message(message)
return
def on_messages_published(self, message):
"""
Callback for listening to subscribed chat room based on Redis Pub/Sub. When a new message is stored
in the given Redis chanel this method will be called.
"""
# Decode message
m = tornado.escape.json_decode(message.body)
# Send messages to other clients and finish connection.
self.write_message(dict(messages=[m]))
def on_message(self, data):
"""
Callback when new message received vie the socket.
"""
logging.info('Received new message %r', data)
#noone can write in the "rooms"
if self.room == 'rooms' or self.room == 'help':
return
try:
# Parse input to message dict.
datadecoded = tornado.escape.json_decode(data)
message = {
'_id': ''.join(random.choice(string.ascii_uppercase) for i in range(12)),
#'from': self.get_secure_cookie('user', str(datadecoded['user'])),
'from': self.application.usernames[self.get_secure_cookie('user')],
'body': tornado.escape.linkify(datadecoded["body"]),
}
if not message['from']:
logging.warning("Error: Authentication missing")
message['from'] = 'Guest'
if str(message['body'])[0] == '!':
box_bot = Bot(self)
box_bot.makeBot(message)
return
except Exception, err:
# Send an error back to client.
self.write_message({'error': 1, 'textStatus': 'Bad input data ... ' + str(err) + data})
return
self.send_massage(message)
def send_massage(self, message):
# Save message and publish in Redis.
try:
# Convert to JSON-literal.
message_encoded = tornado.escape.json_encode(message)
# Persistently store message in Redis.
self.application.client.rpush(self.room, message_encoded)
# Publish message in Redis channel.
self.application.client.publish(self.room, message_encoded)
except Exception, err:
e = str(sys.exc_info()[0])
# Send an error back to client.
self.write_message({'error': 1, 'textStatus': 'Error writing to database: ' + str(err)})
return
# Send message through the socket to indicate a successful operation.
self.write_message(message)
return
def on_close(self):
"""
Callback when the socket is closed. Frees up resource related to this socket.
"""
logging.info("socket closed, cleaning up resources now")
if hasattr(self, 'client'):
# Unsubscribe if not done yet.
if self.subscribed:
self.client.unsubscribe(self.room)
self.subscribed = False
# Disconnect connection after delay due to this issue:
# https://github.com/evilkost/brukva/issues/25
t = Timer(0.1, self.client.disconnect)
t.start()
class Application(tornado.web.Application):
"""
Main Class for this application holding everything together.
"""
def __init__(self):
# Handlers defining the url routing.
handlers = [
(r"/", MainHandler),
(r"/room/([a-zA-Z0-9]*)$", MainHandler),
(r"/login", LoginHandler),
(r"/logout", LogoutHandler),
(r"/socket", ChatSocketHandler),
(r"/socket/([a-zA-Z0-9]*)$", ChatSocketHandler),
]
# Settings:
settings = dict(
cookie_secret = "43osdETzKXasdQAGaYdkL5gEmGeJJFuYh7EQnp2XdTP1o/Vo=",
login_url = "/login",
template_path=os.path.join(os.path.dirname(__file__), "templates"),
static_path=os.path.join(os.path.dirname(__file__), "static"),
xsrf_cookies= True,
autoescape="xhtml_escape",
# Set this to your desired database name.
db_name = 'chat',
# apptitle used as page title in the template.
apptitle = 'Chat example: Tornado, Redis',
)
# Call super constructor.
tornado.web.Application.__init__(self, handlers, **settings)
# Stores user names.
self.usernames = {}
# Connect to Redis.
self.client = redis_connect()
def redis_connect():
"""
Established an asynchronous resi connection.
"""
# Get Redis connection settings for Heroku with fallback to defaults.
redistogo_url = os.getenv('REDISTOGO_URL', None)
if redistogo_url == None:
REDIS_HOST = 'localhost'
REDIS_PORT = 6379
REDIS_PWD = None
REDIS_USER = None
else:
redis_url = redistogo_url
redis_url = redis_url.split('redis://')[1]
redis_url = redis_url.split('/')[0]
REDIS_USER, redis_url = redis_url.split(':', 1)
REDIS_PWD, redis_url = redis_url.split('@', 1)
REDIS_HOST, REDIS_PORT = redis_url.split(':', 1)
client = brukva.Client(host=REDIS_HOST, port=int(REDIS_PORT), password=REDIS_PWD)
client.connect()
return client
def main():
"""
Main function to run the chat application.
"""
# This line will setup default options.
tornado.options.parse_command_line()
# Create an instance of the main application.
application = Application()
# Start application by listening to desired port and starting IOLoop.
application.listen(tornado.options.options.port)
tornado.ioloop.IOLoop.instance().start()
if __name__ == "__main__":
main()