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#!/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.auth
import tornado.escape
import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web
import os.path
import uuid
from tornado.options import define, options
define("port", default=8888, help="run on the given port", type=int)
class Application(tornado.web.Application):
def __init__(self):
handlers = [
(r"/", MainHandler),
(r"/auth/login", AuthLoginHandler),
(r"/auth/logout", AuthLogoutHandler),
(r"/a/message/new", MessageNewHandler),
(r"/a/message/updates", MessageUpdatesHandler),
]
settings = dict(
cookie_secret="43oETzKXQAGaYdkL5gEmGeJJFuYh7EQnp2XdTP1o/Vo=",
login_url="/auth/login",
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)
class BaseHandler(tornado.web.RequestHandler):
def get_current_user(self):
user_json = self.get_secure_cookie("user")
if not user_json: return None
return tornado.escape.json_decode(user_json)
class MainHandler(BaseHandler):
@tornado.web.authenticated
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):
@tornado.web.authenticated
def post(self):
message = {
"id": str(uuid.uuid4()),
"from": self.current_user["first_name"],
"body": self.get_argument("body"),
}
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):
@tornado.web.authenticated
@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
if self.request.connection.stream.closed():
return
self.finish(dict(messages=messages))
class AuthLoginHandler(BaseHandler, tornado.auth.GoogleMixin):
@tornado.web.asynchronous
def get(self):
if self.get_argument("openid.mode", None):
self.get_authenticated_user(self.async_callback(self._on_auth))
return
self.authenticate_redirect(ax_attrs=["name"])
def _on_auth(self, user):
if not user:
raise tornado.web.HTTPError(500, "Google auth failed")
self.set_secure_cookie("user", tornado.escape.json_encode(user))
self.redirect("/")
class AuthLogoutHandler(BaseHandler):
def get(self):
self.clear_cookie("user")
self.write("You are now logged out")
def main():
tornado.options.parse_command_line()
http_server = tornado.httpserver.HTTPServer(Application())
http_server.listen(options.port)
tornado.ioloop.IOLoop.instance().start()
if __name__ == "__main__":
main()
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