# -*- coding: utf-8 -*-
"""
sockjs.tornado.transports.eventsource
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
EventSource transport implementation.
"""
from tornado.web import asynchronous
from sockjs.tornado.transports import streamingbase
[docs]class EventSourceTransport(streamingbase.StreamingTransportBase):
name = 'eventsource'
@asynchronous
[docs] def get(self, session_id):
# Start response
self.preflight()
self.handle_session_cookie()
self.disable_cache()
self.set_header('Content-Type', 'text/event-stream; charset=UTF-8')
self.write('\r\n')
self.flush()
if not self._attach_session(session_id):
self.finish()
return
if self.session:
self.session.flush()
[docs] def send_pack(self, message, binary=False):
if binary:
raise Exception('binary not supported for EventSourceTransport')
msg = 'data: %s\r\n\r\n' % message
self.active = False
try:
self.notify_sent(len(msg))
self.write(msg)
self.flush(callback=self.send_complete)
except IOError:
# If connection dropped, make sure we close offending session instead
# of propagating error all way up.
self.session.delayed_close()
self._detach()