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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.
"""Simplified chat demo for websockets.
Authentication, error handling, etc are left as an exercise for the reader :)
"""
import os.path
import uuid
import sys
import time
from collections import defaultdict
from twisted.python import log
from twisted.internet import reactor, task
import cyclone.escape
import cyclone.web
import cyclone.websocket
class Application(cyclone.web.Application):
def __init__(self):
stats = Stats()
handlers = [
(r"/", MainHandler, dict(stats=stats)),
(r"/stats", StatsPageHandler),
(r"/statssocket", StatsSocketHandler, dict(stats=stats)),
(r"/chatsocket", ChatSocketHandler, dict(stats=stats)),
]
settings = dict(
cookie_secret="43oETzKXQAGaYdkL5gEmGeJJFuYh7EQnp2XdTP1o/Vo=",
template_path=os.path.join(os.path.dirname(__file__), "templates"),
static_path=os.path.join(os.path.dirname(__file__), "static"),
xsrf_cookies=True,
autoescape=None,
)
cyclone.web.Application.__init__(self, handlers, **settings)
class MainHandler(cyclone.web.RequestHandler):
def initialize(self, stats):
self.stats = stats
def get(self):
self.stats.newVisit()
self.render("index.html", messages=ChatSocketHandler.cache)
class ChatSocketHandler(cyclone.websocket.WebSocketHandler):
waiters = set()
cache = []
cache_size = 200
def initialize(self, stats):
self.stats = stats
def connectionMade(self):
ChatSocketHandler.waiters.add(self)
self.stats.newChatter()
def connectionLost(self, reason):
ChatSocketHandler.waiters.remove(self)
self.stats.lostChatter()
@classmethod
def update_cache(cls, chat):
cls.cache.append(chat)
if len(cls.cache) > cls.cache_size:
cls.cache = cls.cache[-cls.cache_size:]
@classmethod
def send_updates(cls, chat):
log.msg("sending message to %d waiters" % len(cls.waiters))
for waiter in cls.waiters:
try:
waiter.sendMessage(chat)
except Exception, e:
log.err("Error sending message. %s" % str(e))
def messageReceived(self, message):
log.msg("got message %s" % message)
parsed = cyclone.escape.json_decode(message)
chat = {
"id": str(uuid.uuid4()),
"body": parsed["body"],
}
chat["html"] = self.render_string("message.html", message=chat)
ChatSocketHandler.update_cache(chat)
ChatSocketHandler.send_updates(chat)
class StatsSocketHandler(cyclone.websocket.WebSocketHandler):
def initialize(self, stats):
self.stats = stats
self._updater = task.LoopingCall(self._sendData)
def connectionMade(self):
self._updater.start(2)
def connectionLost(self, reason):
self._updater.stop()
def _sendData(self):
data = dict(visits=self.stats.todaysVisits(),
chatters=self.stats.chatters)
self.sendMessage(cyclone.escape.json_encode(data))
class Stats(object):
def __init__(self):
self.visits = defaultdict(int)
self.chatters = 0
def todaysVisits(self):
today = time.localtime()
key = time.strftime('%Y%m%d', today)
return self.visits[key]
def newChatter(self):
self.chatters += 1
def lostChatter(self):
self.chatters -= 1
def newVisit(self):
today = time.localtime()
key = time.strftime('%Y%m%d', today)
self.visits[key] += 1
class StatsPageHandler(cyclone.web.RequestHandler):
def get(self):
self.render("stats.html")
def main():
reactor.listenTCP(8888, Application())
reactor.run()
if __name__ == "__main__":
log.startLogging(sys.stdout)
main()
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