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	diff --git a/sylk/applications/webrtcgateway/handler.py b/sylk/applications/webrtcgateway/handler.py
	index e85e166..2ad0225 100644
	--- a/sylk/applications/webrtcgateway/handler.py
	+++ b/sylk/applications/webrtcgateway/handler.py
	@@ -1,1335 +1,1341 @@
	import json
	import os
	import random
	import re
	import uuid
	import weakref

	from application.python import Null
	from application.system import makedirs
	from eventlib import coros, proc
	from eventlib.twistedutil import block_on
	from sipsimple.configuration.settings import SIPSimpleSettings
	from sipsimple.core import SIPURI
	from sipsimple.lookup import DNSLookup, DNSLookupError
	from sipsimple.threading.green import run_in_green_thread
	from sipsimple.util import ISOTimestamp
	from twisted.internet import reactor

	from sylk.applications.webrtcgateway.configuration import GeneralConfig, get_room_config
	from sylk.applications.webrtcgateway.logger import log
	from sylk.applications.webrtcgateway.models import sylkrtc
	from sylk.applications.webrtcgateway.storage import TokenStorage
	from sylk.applications.webrtcgateway.util import GreenEvent

	SIP_PREFIX_RE = re.compile('^sips?:')

	class ACLValidationError(Exception): pass

	sylkrtc_models = {
	# account management
	'account-add' : sylkrtc.AccountAddRequest,
	'account-remove' : sylkrtc.AccountRemoveRequest,
	'account-register' : sylkrtc.AccountRegisterRequest,
	'account-unregister' : sylkrtc.AccountUnregisterRequest,
	'account-devicetoken' : sylkrtc.AccountDeviceTokenRequest,
	# session management
	'session-create' : sylkrtc.SessionCreateRequest,
	'session-answer' : sylkrtc.SessionAnswerRequest,
	'session-trickle' : sylkrtc.SessionTrickleRequest,
	'session-terminate' : sylkrtc.SessionTerminateRequest,
	# video conference management
	'videoroom-join' : sylkrtc.VideoRoomJoinRequest,
	'videoroom-ctl' : sylkrtc.VideoRoomControlRequest,
	'videoroom-terminate' : sylkrtc.VideoRoomTerminateRequest,
	}


	class AccountInfo(object):
	def __init__(self, id, password, display_name=None, user_agent=None):
	self.id = id
	self.password = password
	self.display_name = display_name
	self.user_agent = user_agent
	self.registration_state = None
	self.janus_handle_id = None

	@property
	def uri(self):
	return 'sip:%s' % self.id


	class SessionPartyIdentity(object):
	def __init__(self, uri, display_name=''):
	self.uri = uri
	self.display_name = display_name


	class SIPSessionInfo(object):
	def __init__(self, id):
	self.id = id
	self.direction = None
	self.state = None
	self.account_id = None
	self.local_identity = None # instance of SessionPartyIdentity
	self.remote_identity = None # instance of SessionPartyIdentity
	self.janus_handle_id = None
	self.trickle_ice_active = False

	def init_outgoing(self, account_id, destination):
	self.account_id = account_id
	self.direction = 'outgoing'
	self.state = 'connecting'
	self.local_identity = SessionPartyIdentity(account_id)
	self.remote_identity = SessionPartyIdentity(destination)

	def init_incoming(self, account_id, originator, originator_display_name=''):
	self.account_id = account_id
	self.direction = 'incoming'
	self.state = 'connecting'
	self.local_identity = SessionPartyIdentity(account_id)
	self.remote_identity = SessionPartyIdentity(originator, originator_display_name)


	class VideoRoom(object):
	def __init__(self, uri):
	self.config = get_room_config(uri)
	self.uri = uri
	self.record = self.config.record
	self.rec_dir = os.path.join(GeneralConfig.recording_dir, '%s/' % uri)
	self.id = random.getrandbits(32) # janus needs numeric room names
	self.destroyed = False
	self._session_id_map = weakref.WeakValueDictionary()
	self._publisher_id_map = weakref.WeakValueDictionary()

	if self.record:
	makedirs(self.rec_dir, 0755)
	log.msg('Video room %s created with recording in %s' % (self.uri, self.rec_dir))
	else:
	log.msg('Video room %s created without recording' % self.uri)

	def add(self, session):
	assert session.publisher_id is not None
	assert session.id not in self._session_id_map
	assert session.publisher_id not in self._publisher_id_map
	self._session_id_map[session.id] = session
	self._publisher_id_map[session.publisher_id] = session
	log.msg('Video room %s: added session %s for %s' % (self.uri, session.id, session.account_id))

	def __getitem__(self, key):
	try:
	return self._session_id_map[key]
	except KeyError:
	return self._publisher_id_map[key]

	def __len__(self):
	return len(self._session_id_map)


	class VideoRoomSessionInfo(object):
	def __init__(self, id):
	self.id = id
	self.account_id = None
	self.type = None # publisher / subscriber
	self.publisher_id = None # janus publisher ID for publishers / publisher session ID for subscribers
	self.janus_handle_id = None
	self.room = None
	self.parent_session = None
	self.feeds = {} # janus publisher ID -> our publisher ID
	self.trickle_ice_active = False

	def initialize(self, account_id, type, room):
	assert type in ('publisher', 'subscriber')
	self.account_id = account_id
	self.type = type
	self.room = room
	log.msg('Video room %s: new session %s initialized by %s' % (self.room.uri, self.id, self.account_id))


	def __repr__(self):
	return '<%s: id=%s janus_handle_id=%s type=%s>' % (self.__class__.__name__, self.id, self.janus_handle_id, self.type)


	class VideoRoomSessionContainer(object):
	def __init__(self):
	self._sessions = set()
	self._janus_handle_map = weakref.WeakValueDictionary()
	self._id_map = weakref.WeakValueDictionary()

	def add(self, session):
	assert session not in self._sessions
	assert session.janus_handle_id not in self._janus_handle_map
	assert session.id not in self._id_map
	self._sessions.add(session)
	self._janus_handle_map[session.janus_handle_id] = session
	self._id_map[session.id] = session

	def remove(self, session):
	self._sessions.discard(session)

	def count(self):
	return len(self._sessions)

	def clear(self):
	self._sessions.clear()

	def __len__(self):
	return len(self._sessions)

	def __iter__(self):
	return iter(self._sessions)

	def __getitem__(self, key):
	try:
	return self._id_map[key]
	except KeyError:
	return self._janus_handle_map[key]

	def __contains__(self, item):
	return item in self._id_map or item in self._janus_handle_map or item in self._sessions


	class Operation(object):
	__slots__ = ('name', 'data')

	def __init__(self, name, data):
	self.name = name
	self.data = data


	class APIError(Exception):
	pass


	class ConnectionHandler(object):
	def __init__(self, protocol):
	self.protocol = protocol
	self.janus_session_id = None
	self.accounts_map = {} # account ID -> account
	self.account_handles_map = {} # Janus handle ID -> account
	self.sessions_map = {} # session ID -> session
	self.session_handles_map = {} # Janus handle ID -> session
	self.videoroom_sessions = VideoRoomSessionContainer() # session ID / janus handle ID -> session
	self.ready_event = GreenEvent()
	self.resolver = DNSLookup()
	self.proc = proc.spawn(self._operations_handler)
	self.operations_queue = coros.queue()

	@property
	def end_point_address(self):
	return self.protocol.peer

	def start(self):
	self._create_janus_session()

	def stop(self):
	if self.ready_event.is_set():
	assert self.janus_session_id is not None
	self.protocol.backend.janus_stop_keepalive(self.janus_session_id)
	self.protocol.backend.janus_destroy_session(self.janus_session_id)
	if self.proc is not None:
	self.proc.kill()
	self.proc = None
	# cleanup
	self.ready_event.clear()
	self.accounts_map.clear()
	self.account_handles_map.clear()
	self.sessions_map.clear()
	self.session_handles_map.clear()
	self.videoroom_sessions.clear()
	self.janus_session_id = None
	self.protocol = None

	def handle_message(self, data):
	try:
	request_type = data.pop('sylkrtc')
	except KeyError:
	log.warn('Error getting WebSocket message type')
	return
	self.ready_event.wait()
	try:
	model = sylkrtc_models[request_type]
	except KeyError:
	log.warn('Unknown request type: %s' % request_type)
	return
	try:
	request = model(**data)
	+ except Exception, e:
	+ log.error('%s: %s' % (request_type, e))
	+ return
	+
	+ try:
	request.validate()
	except Exception, e:
	log.error('%s: %s' % (request_type, e))
	if request.transaction:
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	return
	+
	op = Operation(request_type, request)
	self.operations_queue.send(op)

	def validate_acl(self, room_uri, from_uri):
	cfg = get_room_config(room_uri)
	if cfg.access_policy == 'allow,deny':
	if cfg.allow.match(from_uri) and not cfg.deny.match(from_uri):
	return
	raise ACLValidationError
	else:
	if cfg.deny.match(from_uri) and not cfg.allow.match(from_uri):
	raise ACLValidationError

	# internal methods (not overriding / implementing the protocol API)

	def _send_response(self, response):
	response.validate()
	self._send_data(json.dumps(response.to_struct()))

	def _send_data(self, data):
	if GeneralConfig.trace_websocket:
	self.protocol.factory.ws_logger.msg("OUT", ISOTimestamp.now(), data)
	self.protocol.sendMessage(data, False)

	def _cleanup_session(self, session):
	@run_in_green_thread
	def do_cleanup():
	if self.janus_session_id is None:
	# The connection was closed, there is noting to do here
	return
	self.sessions_map.pop(session.id)
	if session.direction == 'outgoing':
	# Destroy plugin handle for outgoing sessions. For incoming ones it's the
	# same as the account handle, so don't
	block_on(self.protocol.backend.janus_detach(self.janus_session_id, session.janus_handle_id))
	self.protocol.backend.janus_set_event_handler(session.janus_handle_id, None)
	self.session_handles_map.pop(session.janus_handle_id)

	# give it some time to receive other hangup events
	reactor.callLater(2, do_cleanup)

	def _cleanup_videoroom_session(self, session):
	@run_in_green_thread
	def do_cleanup():
	if self.janus_session_id is None:
	# The connection was closed, there is noting to do here
	return
	if session in self.videoroom_sessions:
	self.videoroom_sessions.remove(session)
	block_on(self.protocol.backend.janus_detach(self.janus_session_id, session.janus_handle_id))
	self.protocol.backend.janus_set_event_handler(session.janus_handle_id, None)

	# give it some time to receive other hangup events
	reactor.callLater(2, do_cleanup)

	def _maybe_destroy_videoroom(self, videoroom):
	if videoroom is None:
	return

	@run_in_green_thread
	def f():
	if self.protocol is None:
	# The connection was closed
	return
	# destroy the room if empty
	if not videoroom and not videoroom.destroyed:
	videoroom.destroyed = True
	self.protocol.factory.videorooms.remove(videoroom)

	# create a handle to do the cleanup
	handle_id = block_on(self.protocol.backend.janus_attach(self.janus_session_id, 'janus.plugin.videoroom'))
	self.protocol.backend.janus_set_event_handler(handle_id, self._handle_janus_event_videoroom)

	data = {'request': 'destroy',
	'room': videoroom.id}
	try:
	block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data))
	except Exception:
	pass
	block_on(self.protocol.backend.janus_detach(self.janus_session_id, handle_id))
	self.protocol.backend.janus_set_event_handler(handle_id, None)

	log.msg('Video room %s destroyed' % videoroom.uri)

	# don't destroy it immediately
	reactor.callLater(5, f)

	@run_in_green_thread
	def _create_janus_session(self):
	if self.ready_event.is_set():
	self._send_response(sylkrtc.ReadyEvent())
	return
	try:
	self.janus_session_id = block_on(self.protocol.backend.janus_create_session())
	self.protocol.backend.janus_start_keepalive(self.janus_session_id)
	except Exception, e:
	log.warn('Error creating session, disconnecting: %s' % e)
	self.protocol.disconnect(3000, unicode(e))
	return
	self._send_response(sylkrtc.ReadyEvent())
	self.ready_event.set()

	def _lookup_sip_proxy(self, account):
	sip_uri = SIPURI.parse('sip:%s' % account)

	# The proxy dance: Sofia-SIP seems to do a DNS lookup per SIP message when a domain is passed
	# as the proxy, so do the resolution ourselves and give it pre-resolver proxy URL. Since we use
	# caching to avoid long delays, we randomize the results matching the highest priority route's
	# transport.
	proxy = GeneralConfig.outbound_sip_proxy
	if proxy is not None:
	proxy_uri = SIPURI(host=proxy.host,
	port=proxy.port,
	parameters={'transport': proxy.transport})
	else:
	proxy_uri = SIPURI(host=sip_uri.host)
	settings = SIPSimpleSettings()
	routes = self.resolver.lookup_sip_proxy(proxy_uri, settings.sip.transport_list).wait()
	if not routes:
	raise DNSLookupError('no results found')

	# Get all routes with the highest priority transport and randomly pick one
	route = random.choice([r for r in routes if r.transport == routes[0].transport])

	# Build a proxy URI Sofia-SIP likes
	return '%s:%s:%d%s' % ('sips' if route.transport == 'tls' else 'sip',
	route.address,
	route.port,
	';transport=%s' % route.transport if route.transport != 'tls' else '')

	def _handle_conference_invite(self, originator, room_uri, participants):
	for p in participants:
	try:
	account_info = self.accounts_map[p]
	except KeyError:
	continue
	data = dict(sylkrtc='account_event',
	account=account_info.id,
	event='conference_invite',
	data=dict(originator=dict(uri=originator.id, display_name=originator.display_name),
	room=room_uri))
	log.msg('Video room %s: invitation from %s to %s' % (room_uri, originator.id, account_info.id))
	self._send_data(json.dumps(data))

	def _handle_janus_event_sip(self, handle_id, event_type, event):
	# TODO: use a model
	op = Operation('janus-event-sip', data=dict(handle_id=handle_id, event_type=event_type, event=event))
	self.operations_queue.send(op)

	def _handle_janus_event_videoroom(self, handle_id, event_type, event):
	# TODO: use a model
	op = Operation('janus-event-videoroom', data=dict(handle_id=handle_id, event_type=event_type, event=event))
	self.operations_queue.send(op)

	def _operations_handler(self):
	while True:
	op = self.operations_queue.wait()
	handler = getattr(self, '_OH_%s' % op.name.replace('-', '_'), Null)
	try:
	handler(op.data)
	except Exception:
	log.exception('Unhandled exception in operation "%s"' % op.name)
	del op, handler

	def _OH_account_add(self, request):
	# extract the fields to avoid going through the descriptor several times
	account = request.account
	password = request.password
	display_name = request.display_name
	user_agent = request.user_agent

	try:
	if account in self.accounts_map:
	raise APIError('Account %s already added' % account)

	# check if domain is acceptable
	domain = account.partition('@')[2]
	if not {'*', domain}.intersection(GeneralConfig.sip_domains):
	raise APIError('SIP domain not allowed: %s' % domain)

	# Create and store our mapping
	account_info = AccountInfo(account, password, display_name, user_agent)
	self.accounts_map[account_info.id] = account_info
	except APIError, e:
	log.error('account_add: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	log.msg('Account %s added using %s at %s' % (account, user_agent, self.end_point_address))
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))

	def _OH_account_remove(self, request):
	# extract the fields to avoid going through the descriptor several times
	account = request.account

	try:
	try:
	account_info = self.accounts_map.pop(account)
	except KeyError:
	raise APIError('Unknown account specified: %s' % account)

	handle_id = account_info.janus_handle_id
	if handle_id is not None:
	block_on(self.protocol.backend.janus_detach(self.janus_session_id, handle_id))
	self.protocol.backend.janus_set_event_handler(handle_id, None)
	self.account_handles_map.pop(handle_id)
	except APIError, e:
	log.error('account_remove: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	log.msg('Account %s removed' % account)
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))

	def _OH_account_register(self, request):
	# extract the fields to avoid going through the descriptor several times
	account = request.account

	try:
	try:
	account_info = self.accounts_map[account]
	except KeyError:
	raise APIError('Unknown account specified: %s' % account)

	try:
	proxy = self._lookup_sip_proxy(account)
	except DNSLookupError:
	raise APIError('DNS lookup error')

	handle_id = account_info.janus_handle_id
	if handle_id is not None:
	# Destroy the existing plugin handle
	block_on(self.protocol.backend.janus_detach(self.janus_session_id, handle_id))
	self.protocol.backend.janus_set_event_handler(handle_id, None)
	self.account_handles_map.pop(handle_id)
	account_info.janus_handle_id = None

	# Create a plugin handle
	handle_id = block_on(self.protocol.backend.janus_attach(self.janus_session_id, 'janus.plugin.sip'))
	self.protocol.backend.janus_set_event_handler(handle_id, self._handle_janus_event_sip)
	account_info.janus_handle_id = handle_id
	self.account_handles_map[handle_id] = account_info

	data = {'request': 'register',
	'username': account_info.uri,
	'display_name': account_info.display_name,
	'user_agent': account_info.user_agent,
	'ha1_secret': account_info.password,
	'proxy': proxy}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data))
	except APIError, e:
	log.error('account-register: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	log.msg('Account %s will register using %s' % (account, account_info.user_agent))
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))

	def _OH_account_unregister(self, request):
	# extract the fields to avoid going through the descriptor several times
	account = request.account

	try:
	try:
	account_info = self.accounts_map[account]
	except KeyError:
	raise APIError('Unknown account specified: %s' % account)

	handle_id = account_info.janus_handle_id
	if handle_id is not None:
	block_on(self.protocol.backend.janus_detach(self.janus_session_id, handle_id))
	self.protocol.backend.janus_set_event_handler(handle_id, None)
	account_info.janus_handle_id = None
	self.account_handles_map.pop(handle_id)
	except APIError, e:
	log.error('account-unregister: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	log.msg('Account %s will unregister' % account)
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))

	def _OH_account_devicetoken(self, request):
	# extract the fields to avoid going through the descriptor several times
	account = request.account
	old_token = request.old_token
	new_token = request.new_token

	try:
	try:
	account_info = self.accounts_map[account]
	except KeyError:
	raise APIError('Unknown account specified: %s' % account)

	storage = TokenStorage()
	if old_token is not None:
	storage.remove(account, old_token)
	log.msg('Removed device token %s... for account %s', (old_token[:5], account))
	if new_token is not None:
	storage.add(account, new_token)
	log.msg('Added device token %s... for account %s', (new_token[:5], account))
	except APIError, e:
	log.error('account-devicetoken: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))

	def _OH_session_create(self, request):
	# extract the fields to avoid going through the descriptor several times
	account = request.account
	session = request.session
	uri = request.uri
	sdp = request.sdp

	try:
	try:
	account_info = self.accounts_map[account]
	except KeyError:
	raise APIError('Unknown account specified: %s' % account)

	if session in self.sessions_map:
	raise APIError('Session ID (%s) already in use' % session)

	# Create a new plugin handle and 'register' it, without actually doing so
	handle_id = block_on(self.protocol.backend.janus_attach(self.janus_session_id, 'janus.plugin.sip'))
	self.protocol.backend.janus_set_event_handler(handle_id, self._handle_janus_event_sip)
	try:
	proxy = self._lookup_sip_proxy(account_info.id)
	except DNSLookupError:
	block_on(self.protocol.backend.janus_detach(self.janus_session_id, handle_id))
	self.protocol.backend.janus_set_event_handler(handle_id, None)
	raise APIError('DNS lookup error')
	data = {'request': 'register',
	'username': account_info.uri,
	'display_name': account_info.display_name,
	'user_agent': account_info.user_agent,
	'ha1_secret': account_info.password,
	'proxy': proxy,
	'send_register': False}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data))

	session_info = SIPSessionInfo(session)
	session_info.janus_handle_id = handle_id
	session_info.init_outgoing(account, uri)
	# TODO: create a "SessionContainer" object combining the 2
	self.sessions_map[session_info.id] = session_info
	self.session_handles_map[handle_id] = session_info

	data = {'request': 'call', 'uri': 'sip:%s' % SIP_PREFIX_RE.sub('', uri), 'srtp': 'sdes_optional'}
	jsep = {'type': 'offer', 'sdp': sdp}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data, jsep))
	except APIError, e:
	log.error('session-create: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	log.msg('Outgoing session %s from %s to %s created using %s from %s' % (session, account, uri, account_info.user_agent, self.end_point_address))
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))

	def _OH_session_answer(self, request):
	# extract the fields to avoid going through the descriptor several times
	session = request.session
	sdp = request.sdp

	try:
	try:
	session_info = self.sessions_map[session]
	except KeyError:
	raise APIError('Unknown session specified: %s' % session)

	if session_info.direction != 'incoming':
	raise APIError('Cannot answer outgoing session')
	if session_info.state != 'connecting':
	raise APIError('Invalid state for session answer')

	data = {'request': 'accept'}
	jsep = {'type': 'answer', 'sdp': sdp}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, session_info.janus_handle_id, data, jsep))
	except APIError, e:
	log.error('session-answer: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	log.msg('%s answered session %s' % (session_info.account_id, session))
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))

	def _OH_session_trickle(self, request):
	# extract the fields to avoid going through the descriptor several times
	session = request.session
	candidates = [c.to_struct() for c in request.candidates]

	try:
	try:
	session_info = self.sessions_map[session]
	except KeyError:
	raise APIError('Unknown session specified: %s' % session)
	if session_info.state == 'terminated':
	raise APIError('Session is terminated')

	try:
	account_info = self.accounts_map[session_info.account_id]
	except KeyError:
	raise APIError('Unknown account specified: %s' % session_info.account_id)

	block_on(self.protocol.backend.janus_trickle(self.janus_session_id, session_info.janus_handle_id, candidates))
	except APIError, e:
	log.error('session-trickle: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:

	if candidates:
	if not session_info.trickle_ice_active:
	log.msg('Session %s: ICE negotiation started by %s using %s' % (session_info.id, session_info.account_id, account_info.user_agent))
	session_info.trickle_ice_active = True
	else:
	log.msg('Session %s: ICE negotiation ended by %s using %s' % (session_info.id, session_info.account_id, account_info.user_agent))
	session_info.trickle_ice_active = False
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))

	def _OH_session_terminate(self, request):
	# extract the fields to avoid going through the descriptor several times
	session = request.session

	try:
	try:
	session_info = self.sessions_map[session]
	except KeyError:
	raise APIError('Unknown session specified: %s' % session)

	if session_info.state not in ('connecting', 'progress', 'accepted', 'established'):
	raise APIError('Invalid state for session terminate: \"%s\"' % session_info.state)

	if session_info.direction == 'incoming' and session_info.state == 'connecting':
	data = {'request': 'decline', 'code': 486}
	else:
	data = {'request': 'hangup'}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, session_info.janus_handle_id, data))
	except APIError, e:
	log.error('session-terminate: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	log.msg('%s terminated session %s' % (session_info.account_id, session))
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))

	def _OH_videoroom_join(self, request):
	account = request.account
	session = request.session
	uri = request.uri
	sdp = request.sdp
	videoroom = None

	try:
	try:
	self.validate_acl(uri, account)
	except ACLValidationError:
	raise APIError('%s is not allowed to join room %s' % (account, uri))

	try:
	account_info = self.accounts_map[account]
	except KeyError:
	raise APIError('Unknown account specified: %s' % account)

	if session in self.videoroom_sessions:
	raise APIError('Video room session ID (%s) already in use' % session)

	handle_id = block_on(self.protocol.backend.janus_attach(self.janus_session_id, 'janus.plugin.videoroom'))
	self.protocol.backend.janus_set_event_handler(handle_id, self._handle_janus_event_videoroom)

	# create the room if it doesn't exist

	try:
	videoroom = self.protocol.factory.videorooms[uri]
	except KeyError:
	videoroom = VideoRoom(uri)
	self.protocol.factory.videorooms.add(videoroom)

	data = {'request': 'create',
	'room': videoroom.id,
	'publishers': 10,
	'record': videoroom.record,
	'rec_dir': videoroom.rec_dir
	}
	try:
	block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data))
	except Exception, e:
	code = getattr(e, 'code', -1)
	if code != 427: # 417 == room exists
	block_on(self.protocol.backend.janus_detach(self.janus_session_id, handle_id))
	self.protocol.backend.janus_set_event_handler(handle_id, None)
	raise APIError(str(e))

	# join the room
	data = {'request': 'joinandconfigure',
	'room': videoroom.id,
	'ptype': 'publisher',
	'audio': True,
	'video': True
	}
	if account_info.display_name:
	data['display'] = account_info.display_name
	jsep = {'type': 'offer', 'sdp': sdp}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data, jsep))

	videoroom_session = VideoRoomSessionInfo(session)
	videoroom_session.janus_handle_id = handle_id
	videoroom_session.initialize(account, 'publisher', videoroom)
	self.videoroom_sessions.add(videoroom_session)
	except APIError, e:
	log.error('videoroom-join: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	self._maybe_destroy_videoroom(videoroom)
	else:
	log.msg('Video room %s: joined by %s using %s (%d participants present) from %s' % (videoroom.uri, account, account_info.user_agent, self.videoroom_sessions.count(), self.end_point_address))
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))
	data = dict(sylkrtc='videoroom_event',
	session=videoroom_session.id,
	event='state',
	data=dict(state='progress'))
	self._send_data(json.dumps(data))

	def _OH_videoroom_ctl(self, request):
	if request.option == 'trickle':
	trickle = request.trickle
	if not trickle:
	log.error('videoroom-ctl: missing field')
	return
	candidates = [c.to_struct() for c in trickle.candidates]
	session = trickle.session or request.session
	try:
	try:
	videoroom_session = self.videoroom_sessions[session]
	except KeyError:
	raise APIError('trickle: unknown video room session ID specified: %s' % session)

	try:
	account_info = self.accounts_map[videoroom_session.account_id]
	except KeyError:
	raise APIError('Unknown account specified: %s' % videoroom_session.account_id)

	block_on(self.protocol.backend.janus_trickle(self.janus_session_id, videoroom_session.janus_handle_id, candidates))
	except APIError, e:
	log.error('videoroom-ctl: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	if candidates:
	if not videoroom_session.trickle_ice_active:
	log.msg('Video room %s: ICE negotiation started by %s using %s' % (videoroom_session.room.uri, videoroom_session.account_id, account_info.user_agent))
	videoroom_session.trickle_ice_active = True
	else:
	log.msg('Video room %s: ICE negotiation ended by %s using %s' % (videoroom_session.room.uri, videoroom_session.account_id, account_info.user_agent))
	videoroom_session.trickle_ice_active = False

	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))
	elif request.option == 'feed-attach':
	feed_attach = request.feed_attach
	if not feed_attach:
	log.error('videoroom-ctl: missing field')
	return
	try:
	if feed_attach.session in self.videoroom_sessions:
	raise APIError('feed-attach: video room session ID (%s) already in use' % feed_attach.session)

	# get the 'base' session, the one used to join and publish
	try:
	base_session = self.videoroom_sessions[request.session]
	except KeyError:
	raise APIError('feed-attach: unknown video room session ID specified: %s' % request.session)

	# get the publisher's session
	try:
	publisher_session = base_session.room[feed_attach.publisher]
	except KeyError:
	raise APIError('feed-attach: unknown publisher video room session ID specified: %s' % feed_attach.publisher)
	if publisher_session.publisher_id is None:
	raise APIError('feed-attach: video room session ID does not have a publisher ID' % feed_attach.publisher)

	handle_id = block_on(self.protocol.backend.janus_attach(self.janus_session_id, 'janus.plugin.videoroom'))
	self.protocol.backend.janus_set_event_handler(handle_id, self._handle_janus_event_videoroom)

	# join the room as a listener
	data = {'request': 'join',
	'room': base_session.room.id,
	'ptype': 'listener',
	'feed': publisher_session.publisher_id}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data))

	videoroom_session = VideoRoomSessionInfo(feed_attach.session)
	videoroom_session.janus_handle_id = handle_id
	videoroom_session.parent_session = base_session
	videoroom_session.publisher_id = publisher_session.id
	videoroom_session.initialize(base_session.account_id, 'subscriber', base_session.room)
	self.videoroom_sessions.add(videoroom_session)
	base_session.feeds[publisher_session.publisher_id] = publisher_session.id
	except APIError, e:
	log.error('videoroom-ctl: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	log.msg('Video room %s: %s attached to %s' % (base_session.room.uri, base_session.account_id, feed_attach.publisher))
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))
	elif request.option == 'feed-answer':
	feed_answer = request.feed_answer
	if not feed_answer:
	log.error('videoroom-ctl: missing field')
	return
	try:
	try:
	videoroom_session = self.videoroom_sessions[request.feed_answer.session]
	except KeyError:
	raise APIError('feed-answer: unknown video room session ID specified: %s' % feed_answer.session)
	data = {'request': 'start',
	'room': videoroom_session.room.id}
	jsep = {'type': 'answer', 'sdp': feed_answer.sdp}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, videoroom_session.janus_handle_id, data, jsep))
	except APIError, e:
	log.error('videoroom-ctl: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))
	elif request.option == 'feed-detach':
	feed_detach = request.feed_detach
	if not feed_detach:
	log.error('videoroom-ctl: missing field')
	return
	try:
	try:
	base_session = self.videoroom_sessions[request.session]
	except KeyError:
	raise APIError('feed-detach: unknown video room session ID specified: %s' % request.session)
	try:
	videoroom_session = self.videoroom_sessions[feed_detach.session]
	except KeyError:
	raise APIError('feed-detach: unknown video room session ID specified: %s' % feed_detach.session)
	data = {'request': 'leave'}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, videoroom_session.janus_handle_id, data))
	except APIError, e:
	log.error('videoroom-ctl: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))
	block_on(self.protocol.backend.janus_detach(self.janus_session_id, videoroom_session.janus_handle_id))
	self.protocol.backend.janus_set_event_handler(videoroom_session.janus_handle_id, None)
	self.videoroom_sessions.remove(videoroom_session)
	try:
	janus_publisher_id = next(k for k, v in base_session.feeds.iteritems() if v == videoroom_session.publisher_id)
	except StopIteration:
	pass
	else:
	base_session.feeds.pop(janus_publisher_id)
	elif request.option == 'invite-participants':
	invite_participants = request.invite_participants
	if not invite_participants:
	log.error('videoroom-ctl: missing field')
	return
	try:
	try:
	base_session = self.videoroom_sessions[request.session]
	account_info = self.accounts_map[base_session.account_id]
	except KeyError:
	raise APIError('invite-participants: unknown video room session ID specified: %s' % request.session)
	except APIError, e:
	log.error('videoroom-ctl: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))
	for conn in self.protocol.factory.connections.difference([self]):
	if conn.connection_handler:
	conn.connection_handler._handle_conference_invite(account_info, base_session.room.uri, invite_participants.participants)
	else:
	log.error('videoroom-ctl: unsupported option: %s' % request.option)

	def _OH_videoroom_terminate(self, request):
	session = request.session

	try:
	try:
	videoroom_session = self.videoroom_sessions[session]
	except KeyError:
	raise APIError('Unknown video room session ID specified: %s' % session)
	data = {'request': 'leave'}
	block_on(self.protocol.backend.janus_message(self.janus_session_id, videoroom_session.janus_handle_id, data))
	except APIError, e:
	log.error('videoroom-terminate: %s' % e)
	self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e)))
	else:
	log.msg('Video room %s: %s left the room (%d participants present)' % (videoroom_session.room.uri, videoroom_session.account_id, self.videoroom_sessions.count()))
	self._send_response(sylkrtc.AckResponse(transaction=request.transaction))
	data = dict(sylkrtc='videoroom_event',
	session=videoroom_session.id,
	event='state',
	data=dict(state='terminated'))
	self._send_data(json.dumps(data))
	self._cleanup_videoroom_session(videoroom_session)
	self._maybe_destroy_videoroom(videoroom_session.room)

	# Event handlers

	def _OH_janus_event_sip(self, data):
	handle_id = data['handle_id']
	event_type = data['event_type']
	event = data['event']

	if event_type == 'event':
	self._janus_event_plugin_sip(data)
	elif event_type == 'webrtcup':
	try:
	session_info = self.session_handles_map[handle_id]
	except KeyError:
	log.msg('Could not find session for handle ID %s' % handle_id)
	return
	session_info.state = 'established'
	data = dict(sylkrtc='session_event',
	session=session_info.id,
	event='state',
	data=dict(state=session_info.state))
	direction = session_info.direction.title()
	log.msg('%s session %s from %s to %s state: %s' % (direction,
	session_info.id,
	session_info.local_identity.uri if direction == 'Outgoing' else session_info.remote_identity.uri,
	session_info.remote_identity.uri if direction == 'Outgoing' else session_info.local_identity.uri,
	session_info.state))

	# TODO: SessionEvent model
	self._send_data(json.dumps(data))
	elif event_type == 'hangup':
	try:
	session_info = self.session_handles_map[handle_id]
	except KeyError:
	log.msg('Could not find session for handle ID %s' % handle_id)
	return
	if session_info.state != 'terminated':
	session_info.state = 'terminated'
	code = event.get('code', 0)
	reason = event.get('reason', 'Unknown')
	reason = '%d %s' % (code, reason)
	data = dict(sylkrtc='session_event',
	session=session_info.id,
	event='state',
	data=dict(state=session_info.state, reason=reason))
	# TODO: SessionEvent model
	self._send_data(json.dumps(data))
	self._cleanup_session(session_info)
	direction = session_info.direction.title()
	log.msg('%s session %s from %s to %s terminated (%s)' % (direction,
	session_info.id,
	session_info.local_identity.uri if direction == 'Outgoing' else session_info.remote_identity.uri,
	session_info.remote_identity.uri if direction == 'Outgoing' else session_info.local_identity.uri,
	reason))
	elif event_type in ('media', 'detached'):
	# ignore
	pass
	elif event_type == 'slowlink':
	# TODO something
	pass
	else:
	log.warn('Received unexpected event type: %s' % event_type)

	def _janus_event_plugin_sip(self, data):
	handle_id = data['handle_id']
	event = data['event']
	plugin_data = event['plugindata']
	assert(plugin_data['plugin'] == 'janus.plugin.sip')
	event_data = event['plugindata']['data']
	assert(event_data.get('sip', '') == 'event')

	if 'result' not in event_data:
	log.warn('Unexpected event: %s' % event)
	return

	event_data = event_data['result']
	jsep = event.get('jsep', None)
	event_type = event_data['event']
	if event_type in ('registering', 'registered', 'registration_failed', 'incomingcall'):
	# skip 'registered' events from session handles
	if event_type == 'registered' and event_data['register_sent'] in (False, 'false'):
	return
	# account event
	try:
	account_info = self.account_handles_map[handle_id]
	except KeyError:
	log.warn('Could not find account for handle ID %s' % handle_id)
	return
	if event_type == 'incomingcall':
	originator_uri = SIP_PREFIX_RE.sub('', event_data['username'])
	originator_display_name = event_data.get('displayname', '').replace('"', '')
	jsep = event.get('jsep', None)
	assert jsep is not None
	session_id = uuid.uuid4().hex
	session = SIPSessionInfo(session_id)
	session.janus_handle_id = handle_id
	session.init_incoming(account_info.id, originator_uri, originator_display_name)
	self.sessions_map[session_id] = session
	self.session_handles_map[handle_id] = session
	data = dict(sylkrtc='account_event',
	account=account_info.id,
	session=session_id,
	event='incoming_session',
	data=dict(originator=session.remote_identity.__dict__, sdp=jsep['sdp']))
	log.msg('Incoming session %s from %s to %s created' % (session.id,
	session.remote_identity.uri,
	session.local_identity.uri))
	else:
	registration_state = event_type
	if registration_state == 'registration_failed':
	registration_state = 'failed'
	if account_info.registration_state == registration_state:
	return
	account_info.registration_state = registration_state
	registration_data = dict(state=registration_state)
	if registration_state == 'failed':
	code = event_data['code']
	reason = event_data['reason']
	registration_data['reason'] = '%d %s' % (code, reason)
	log.msg('Account %s registration failed: %s (%s)' % (account_info.id, code, reason))
	elif registration_state == 'registered':
	log.msg('Account %s registered using %s from %s' % (account_info.id, account_info.user_agent, self.end_point_address))
	data = dict(sylkrtc='account_event',
	account=account_info.id,
	event='registration_state',
	data=registration_data)
	# TODO: AccountEvent model
	self._send_data(json.dumps(data))
	elif event_type in ('calling', 'accepted', 'hangup'):
	# session event
	try:
	session_info = self.session_handles_map[handle_id]
	except KeyError:
	log.warn('Could not find session for handle ID %s' % handle_id)
	return
	if event_type == 'hangup' and session_info.state == 'terminated':
	return
	if event_type == 'calling':
	session_info.state = 'progress'
	elif event_type == 'accepted':
	session_info.state = 'accepted'
	elif event_type == 'hangup':
	session_info.state = 'terminated'
	data = dict(sylkrtc='session_event',
	session=session_info.id,
	event='state',
	data=dict(state=session_info.state))
	direction = session_info.direction.title()
	log.msg('%s session %s from %s to %s state: %s' % (direction,
	session_info.id,
	session_info.local_identity.uri if direction == 'Outgoing' else session_info.remote_identity.uri,
	session_info.remote_identity.uri if direction == 'Outgoing' else session_info.local_identity.uri,
	session_info.state))
	if session_info.state == 'accepted' and session_info.direction == 'outgoing':
	assert jsep is not None
	data['data']['sdp'] = jsep['sdp']
	elif session_info.state == 'terminated':
	code = event_data.get('code', 0)
	reason = event_data.get('reason', 'Unknown')
	reason = '%d %s' % (code, reason)
	data['data']['reason'] = reason
	# TODO: SessionEvent model
	self._send_data(json.dumps(data))
	if session_info.state == 'terminated':
	self._cleanup_session(session_info)
	direction = session_info.direction.title()
	log.msg('%s session %s from %s to %s terminated (%s)' % (direction,
	session_info.id,
	session_info.local_identity.uri if direction == 'Outgoing' else session_info.remote_identity.uri,
	session_info.remote_identity.uri if direction == 'Outgoing' else session_info.local_identity.uri,
	reason))
	# check if missed incoming call
	if session_info.direction == 'incoming' and code == 487:
	data = dict(sylkrtc='account_event',
	account=session_info.account_id,
	event='missed_session',
	data=dict(originator=session_info.remote_identity.__dict__))
	log.msg('Incoming session from %s to %s was not answered ' % (session_info.remote_identity.uri, session_info.local_identity.uri))
	# TODO: AccountEvent model
	self._send_data(json.dumps(data))
	elif event_type == 'missed_call':
	try:
	account_info = self.account_handles_map[handle_id]
	except KeyError:
	log.warn('Could not find account for handle ID %s' % handle_id)
	return
	originator_uri = SIP_PREFIX_RE.sub('', event_data['caller'])
	originator_display_name = event_data.get('displayname', '').replace('"', '')
	# We have no session, so create an identity object by hand
	originator = SessionPartyIdentity(originator_uri, originator_display_name)
	data = dict(sylkrtc='account_event',
	account=account_info.id,
	event='missed_session',
	data=dict(originator=originator.__dict__))
	log.msg('Incoming session from %s missed' % originator.uri)
	# TODO: AccountEvent model
	self._send_data(json.dumps(data))
	elif event_type in ('ack', 'declining', 'hangingup', 'proceeding'):
	# ignore
	pass
	else:
	log.warn('Unexpected SIP plugin event type: %s' % event_type)

	def _OH_janus_event_videoroom(self, data):
	handle_id = data['handle_id']
	event_type = data['event_type']

	if event_type == 'event':
	self._janus_event_plugin_videoroom(data)
	elif event_type == 'webrtcup':
	try:
	videoroom_session = self.videoroom_sessions[handle_id]
	except KeyError:
	log.warn('Could not find videoroom session for handle ID %s' % handle_id)
	return
	base_session = videoroom_session.parent_session
	if base_session is None:
	data = dict(sylkrtc='videoroom_event',
	session=videoroom_session.id,
	event='state',
	data=dict(state='established'))
	else:
	# this is a subscriber session
	data = dict(sylkrtc='videoroom_event',
	session=base_session.id,
	event='feed_established',
	data=dict(state='established', subscription=videoroom_session.id))
	log.msg('Video room %s: session established to %s' % (videoroom_session.room.uri, videoroom_session.account_id))
	self._send_data(json.dumps(data))
	elif event_type == 'hangup':
	try:
	videoroom_session = self.videoroom_sessions[handle_id]
	except KeyError:
	log.warn('Could not find video room session for handle ID %s' % handle_id)
	return
	log.msg('Video room %s: session terminated to %s' % (videoroom_session.room.uri, videoroom_session.account_id))
	self._cleanup_videoroom_session(videoroom_session)
	self._maybe_destroy_videoroom(videoroom_session.room)
	elif event_type in ('media', 'detached'):
	# ignore
	pass
	elif event_type == 'slowlink':
	try:
	videoroom_session = (session_info for session_info in self.videoroom_sessions if session_info.janus_handle_id == handle_id).next()
	except StopIteration:
	log.warn('Could not find video room session for Janus handle ID %s' % handle_id)
	else:

	try:
	account_info = self.accounts_map[videoroom_session.account_id]
	except KeyError:
	raise APIError('Unknown account specified: %s' % videoroom_session.account_id)

	try:
	uplink = data['event']['uplink']
	except KeyError:
	log.warn('Could not find uplink in slowlink event data')
	else:
	if uplink:
	log.msg('Video room %s: %s has poor download connection on %s' % (videoroom_session.room.uri, videoroom_session.account_id, account_info.user_agent))
	else:
	log.msg('Video room %s: %s has poor upload connection on %s' % (videoroom_session.room.uri, videoroom_session.account_id, account_info.user_agent))

	else:
	log.warn('Received unexpected event type %s: data=%s' % (event_type, data))

	def _janus_event_plugin_videoroom(self, data):
	handle_id = data['handle_id']
	event = data['event']
	plugin_data = event['plugindata']
	assert(plugin_data['plugin'] == 'janus.plugin.videoroom')
	event_data = event['plugindata']['data']
	assert 'videoroom' in event_data

	event_type = event_data['videoroom']
	if event_type == 'joined':
	# a join request succeeded, this is a publisher
	try:
	videoroom_session = self.videoroom_sessions[handle_id]
	except KeyError:
	log.warn('Could not find video room session for handle ID %s' % handle_id)
	return
	room = videoroom_session.room
	videoroom_session.publisher_id = event_data['id']
	room.add(videoroom_session)
	jsep = event.get('jsep', None)
	assert jsep is not None
	data = dict(sylkrtc='videoroom_event',
	session=videoroom_session.id,
	event='state',
	data=dict(state='accepted', sdp=jsep['sdp']))
	self._send_data(json.dumps(data))
	# send information about existing publishers
	publishers = []
	for p in event_data['publishers']:
	publisher_id = p['id']
	publisher_display = p.get('display', '')
	try:
	publisher_session = room[publisher_id]
	except KeyError:
	log.warn('Could not find matching session for publisher %s' % publisher_id)
	continue
	item = {
	'id': publisher_session.id,
	'uri': publisher_session.account_id,
	'display_name': publisher_display,
	}
	publishers.append(item)
	data = dict(sylkrtc='videoroom_event',
	session=videoroom_session.id,
	event='initial_publishers',
	data=dict(publishers=publishers))
	self._send_data(json.dumps(data))
	elif event_type == 'event':
	if 'publishers' in event_data:
	try:
	videoroom_session = self.videoroom_sessions[handle_id]
	except KeyError:
	log.warn('Could not find videoroom session for handle ID %s' % handle_id)
	return
	room = videoroom_session.room
	# send information about new publishers
	publishers = []
	for p in event_data['publishers']:
	publisher_id = p['id']
	publisher_display = p.get('display', '')
	try:
	publisher_session = room[publisher_id]
	except KeyError:
	log.warn('Could not find matching session for publisher %s' % publisher_id)
	continue
	item = {
	'id': publisher_session.id,
	'uri': publisher_session.account_id,
	'display_name': publisher_display,
	}
	publishers.append(item)
	data = dict(sylkrtc='videoroom_event',
	session=videoroom_session.id,
	event='publishers_joined',
	data=dict(publishers=publishers))
	self._send_data(json.dumps(data))
	elif 'leaving' in event_data:
	try:
	base_session = self.videoroom_sessions[handle_id]
	except KeyError:
	log.warn('Could not find video room session for handle ID %s' % handle_id)
	return
	janus_publisher_id = event_data['leaving']
	try:
	publisher_id = base_session.feeds.pop(janus_publisher_id)
	except KeyError:
	return
	data = dict(sylkrtc='videoroom_event',
	session=base_session.id,
	event='publishers_left',
	data=dict(publishers=[publisher_id]))
	self._send_data(json.dumps(data))
	elif {'started', 'unpublished', 'left'}.intersection(event_data):
	# ignore
	pass
	else:
	log.warn('Received unexpected plugin "event" event')
	elif event_type == 'attached':
	# sent when a feed is subscribed for a given publisher
	try:
	videoroom_session = self.videoroom_sessions[handle_id]
	except KeyError:
	log.warn('Could not find videoroom session for handle ID %s' % handle_id)
	return
	# get the session which originated the subscription
	base_session = videoroom_session.parent_session
	assert base_session is not None
	jsep = event.get('jsep', None)
	assert jsep is not None
	assert jsep['type'] == 'offer'
	data = dict(sylkrtc='videoroom_event',
	session=base_session.id,
	event='feed_attached',
	data=dict(sdp=jsep['sdp'], subscription=videoroom_session.id))
	self._send_data(json.dumps(data))
	elif event_type == 'slow_link':
	pass
	else:
	log.warn('Received unexpected plugin event type %s: plugin_data=%s, event_data=%s' % (event_type, plugin_data, event_data))

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