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chat.py
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chat.py
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import re
import unicodedata
from socketio import socketio_manage
from socketio.namespace import BaseNamespace
from socketio.mixins import RoomsMixin, BroadcastMixin
from werkzeug.exceptions import NotFound
from gevent import monkey
from flask import Flask, Response, request, render_template, url_for, redirect
from flask.ext.sqlalchemy import SQLAlchemy
monkey.patch_all()
app = Flask(__name__)
app.debug = True
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/chat.db'
db = SQLAlchemy(app)
# models
class ChatRoom(db.Model):
__tablename__ = 'chatrooms'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(20), nullable=False)
slug = db.Column(db.String(50))
users = db.relationship('ChatUser', backref='chatroom', lazy='dynamic')
def __unicode__(self):
return self.name
def get_absolute_url(self):
return url_for('room', slug=self.slug)
def save(self, *args, **kwargs):
if not self.slug:
self.slug = slugify(self.name)
db.session.add(self)
db.session.commit()
class ChatUser(db.Model):
__tablename__ = 'chatusers'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(20), nullable=False)
session = db.Column(db.String(20), nullable=False)
chatroom_id = db.Column(db.Integer, db.ForeignKey('chatrooms.id'))
def __unicode__(self):
return self.name
# utils
def slugify(value):
value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore')
value = unicode(re.sub('[^\w\s-]', '', value).strip().lower())
return re.sub('[-\s]+', '-', value)
def get_object_or_404(klass, **query):
instance = klass.query.filter_by(**query).first()
if not instance:
raise NotFound()
return instance
def get_or_create(klass, **kwargs):
try:
return get_object_or_404(klass, **kwargs), False
except NotFound:
instance = klass(**kwargs)
instance.save()
return instance, True
def init_db():
db.create_all(app=app)
# views
@app.route('/')
def rooms():
"""
Homepage - lists all rooms.
"""
context = {"rooms": ChatRoom.query.all()}
return render_template('rooms.html', **context)
@app.route('/<path:slug>')
def room(slug):
"""
Show a room.
"""
context = {"room": get_object_or_404(ChatRoom, slug=slug)}
return render_template('room.html', **context)
@app.route('/create', methods=['POST'])
def create():
"""
Handles post from the "Add room" form on the homepage, and
redirects to the new room.
"""
name = request.form.get("name")
if name:
room, created = get_or_create(ChatRoom, name=name)
return redirect(url_for('room', slug=room.slug))
return redirect(url_for('rooms'))
class ChatNamespace(BaseNamespace, RoomsMixin, BroadcastMixin):
nicknames = []
def initialize(self):
self.logger = app.logger
self.log("Socketio session started")
def log(self, message):
self.logger.info(u"[{0}] {1}".format(self.socket.sessid, message))
def on_join(self, room):
self.room = room
self.join(room)
return True
def on_nickname(self, nickname):
self.log(u'Nickname: {0}'.format(nickname))
self.nicknames.append(nickname)
self.session['nickname'] = nickname
self.broadcast_event('announcement', '%s has connected' % nickname)
self.broadcast_event('nicknames', self.nicknames)
return True, nickname
def recv_disconnect(self):
# Remove nickname from the list.
self.log('Disconnected')
nickname = self.session['nickname']
self.nicknames.remove(nickname)
self.broadcast_event('announcement', '%s has disconnected' % nickname)
self.broadcast_event('nicknames', self.nicknames)
self.disconnect(silent=True)
return True
def on_user_message(self, msg):
self.log(u'User message: {0}'.format(msg))
self.emit_to_room(self.room, 'msg_to_room',
self.session['nickname'], msg)
return True
@app.route('/socket.io/<path:remaining>')
def socketio(remaining):
try:
socketio_manage(request.environ, {'/chat': ChatNamespace}, request)
except:
app.logger.error("Exception while handling socketio connection",
exc_info=True)
return Response()
if __name__ == '__main__':
app.run()