openmedialibrary/oml/websocket.py

49 lines
1.3 KiB
Python

# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from __future__ import division
from tornado.websocket import WebSocketHandler
from tornado.ioloop import IOLoop
import json
from oxtornado import json_dumps
import state
import logging
logger = logging.getLogger('oml.websocket')
class Handler(WebSocketHandler):
def open(self):
if self.request.host not in self.request.headers['origin']:
logger.debug('reject cross site attempt to open websocket %s', self.request)
self.close()
if self not in state.websockets:
state.websockets.append(self)
#websocket calls
def on_message(self, message):
action, data = json.load(message)
if state.tasks:
state.tasks.queue(action, data)
def on_close(self):
if self in state.websockets:
state.websockets.remove(self)
def post(self, event, data):
message = json_dumps([event, data])
main = IOLoop.instance()
main.add_callback(lambda: self.write_message(message))
def trigger_event(event, data):
if len(state.websockets):
logger.debug('trigger event %s %s %s', event, data, len(state.websockets))
for ws in state.websockets:
try:
ws.post(event, data)
except:
logger.debug('failed to send to ws %s %s %s', ws, event, data, exc_info=1)