openmedialibrary/oml/websocket.py

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# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
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from tornado.websocket import WebSocketHandler
from tornado.ioloop import IOLoop
import json
from oxtornado import json_dumps
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import state
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import logging
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logger = logging.getLogger('oml.websocket')
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class Handler(WebSocketHandler):
def check_origin(self, origin):
# allow access to websocket from site, installer and loader (local file)
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return self.request.host in origin or \
origin in (
'http://127.0.0.1:9841',
'http://127.0.0.1:9842',
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'file://',
'null'
)
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def open(self):
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if self.request.headers['origin'] not in ('null', 'http://127.0.0.1:9842') \
and self.request.host not in self.request.headers['origin']:
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logger.debug('reject cross site attempt to open websocket %s', self.request)
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self.close()
if self not in state.websockets:
state.websockets.append(self)
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#websocket calls
def on_message(self, message):
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action, data = json.loads(message)
if state.tasks:
state.tasks.queue(action, data)
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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()
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if self.ws_connection is None:
self.on_close()
else:
main.add_callback(lambda: self.write_message(message))
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def trigger_event(event, data):
if len(state.websockets):
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logger.debug('trigger event %s %s %s', event, data, len(state.websockets))
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for ws in state.websockets:
try:
ws.post(event, data)
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except:
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logger.debug('failed to send to ws %s %s %s', ws, event, data, exc_info=1)