chatdemo.py

#!/usr/bin/env python
#
# Copyright 2009 Facebook
#
# 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
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

import logging
import tornado.escape
import tornado.ioloop
import tornado.options
import tornado.web
import os.path
import uuid
from sina_auth import AuthLogoutHandler, AuthLoginHandler, AuthLoginCheckHandler, login_required
from tornado.options import define, options
from base import BaseHandler
import session

define("port", default=8000, help="run on the given port", type=int)
define("SINA_APP_KEY", default="3268956170", help="sina_app_key")
define("SINA_APP_SECRET", default="edb869b055dd6c3041999c30f4fbb6ed", help="SINA_APP_SECRET")


class Application(tornado.web.Application):
    def __init__(self):
        
        handlers = [
            (r"/", MainHandler),
            (r"/wblogin", AuthLoginHandler),
            (r"/wblogout", AuthLogoutHandler),
            (r"/wblogin_check", AuthLoginCheckHandler),
            (r"/a/message/new", MessageNewHandler),
            (r"/a/message/updates", MessageUpdatesHandler),
        ]
        settings = dict(
            cookie_secret="43oETzKXQAGaYdkL5gEmGeJJFuYh7EQnp2XdTP1o/Vo=",
            #login_url="/auth/login",
            session_secret='some secret password!!',
            session_dir='sessions',
            template_path=os.path.join(os.path.dirname(__file__), "templates"),
            static_path=os.path.join(os.path.dirname(__file__), "static"),
            xsrf_cookies=True,
        )
        tornado.web.Application.__init__(self, handlers, **settings)
        self.session_manager = session.TornadoSessionManager(settings["session_secret"], settings["session_dir"])


class MainHandler(BaseHandler):
    @login_required
    def get(self):
        self.render("index.html", messages=MessageMixin.cache)


class MessageMixin(object):
    waiters = []
    cache = []
    cache_size = 200

    def wait_for_messages(self, callback, cursor=None):
        cls = MessageMixin
        if cursor:
            index = 0
            for i in xrange(len(cls.cache)):
                index = len(cls.cache) - i - 1
                if cls.cache[index]["id"] == cursor: break
            recent = cls.cache[index + 1:]
            if recent:
                callback(recent)
                return
        cls.waiters.append(callback)

    def new_messages(self, messages):
        cls = MessageMixin
        logging.info("Sending new message to %r listeners", len(cls.waiters))
        for callback in cls.waiters:
            try:
                callback(messages)
            except:
                logging.error("Error in waiter callback", exc_info=True)
        cls.waiters = []
        cls.cache.extend(messages)
        if len(cls.cache) > self.cache_size:
            cls.cache = cls.cache[-self.cache_size:]


class MessageNewHandler(BaseHandler, MessageMixin):
    @login_required
    def post(self):
        message = {
            "id": str(uuid.uuid4()),
            "from": self.current_user,
            "image": self.get_user_image(),
            "body": self.get_argument("body"),
            "sina_url": self.get_user_url(),
        }
        message["html"] = self.render_string("message.html", message=message)
        if self.get_argument("next", None):
            self.redirect(self.get_argument("next"))
        else:
            self.write(message)
        self.new_messages([message])


class MessageUpdatesHandler(BaseHandler, MessageMixin):
    @login_required
    @tornado.web.asynchronous
    def post(self):
        cursor = self.get_argument("cursor", None)
        self.wait_for_messages(self.async_callback(self.on_new_messages),
                               cursor=cursor)

    def on_new_messages(self, messages):
        # Closed client connection
        print "waiters: ", self.waiters
        if self.request.connection.stream.closed():
            print "closed....", messages
            return
        self.finish(dict(messages=messages))




def main():
    tornado.options.parse_command_line()
    app = Application()
    app.listen(options.port)
    print "start on port %s..."%options.port
    tornado.ioloop.IOLoop.instance().start()


if __name__ == "__main__":
    main()