diff --git a/sylk/applications/webrtcgateway/handler.py b/sylk/applications/webrtcgateway/handler.py index b28a3b6..e8a219f 100644 --- a/sylk/applications/webrtcgateway/handler.py +++ b/sylk/applications/webrtcgateway/handler.py @@ -1,1312 +1,1313 @@ import hashlib import json import random import re import time import uuid from application.python import Null, limit from application.python.weakref import defaultweakobjectmap from application.system import makedirs from collections import OrderedDict 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 call_in_green_thread, run_in_green_thread from twisted.internet import reactor from sylk.applications.webrtcgateway.configuration import GeneralConfig, get_room_config from sylk.applications.webrtcgateway.janus.backend import JanusError from sylk.applications.webrtcgateway.logger import ConnectionLogger, VideoroomLogger 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?:') sylkrtc_models = {model.sylkrtc.value: model for model in vars(sylkrtc).values() if hasattr(model, 'sylkrtc') and issubclass(model, sylkrtc.SylkRTCRequestBase)} 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 @property def user_data(self): return dict(username=self.uri, display_name=self.display_name, user_agent=self.user_agent, ha1_secret=self.password) class SessionPartyIdentity(object): def __init__(self, uri, display_name=''): self.uri = uri self.display_name = display_name # todo: might need to replace this auto-resetting descriptor with a timer in case we need to know when the slow link state expired # class SlowLinkState(object): def __init__(self): self.slow_link = False self.last_reported = 0 class SlowLinkDescriptor(object): __timeout__ = 30 # 30 seconds def __init__(self): self.values = defaultweakobjectmap(SlowLinkState) def __get__(self, instance, owner): if instance is None: return self state = self.values[instance] if state.slow_link and time.time() - state.last_reported > self.__timeout__: state.slow_link = False return state.slow_link def __set__(self, instance, value): state = self.values[instance] if value: state.last_reported = time.time() state.slow_link = bool(value) def __delete__(self, instance): raise AttributeError('Attribute cannot be deleted') class SIPSessionInfo(object): slow_download = SlowLinkDescriptor() slow_upload = SlowLinkDescriptor() 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.slow_download = False self.slow_upload = 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.id = random.getrandbits(32) # janus needs numeric room names self.uri = uri self.config = get_room_config(uri) self.log = VideoroomLogger(self) self._active_participants = [] self._sessions = set() self._id_map = {} # map session.id -> session and session.publisher_id -> session if self.config.record: makedirs(self.config.recording_dir, 0o755) self.log.info('created (recording on)') else: self.log.info('created') @property def active_participants(self): return self._active_participants @active_participants.setter def active_participants(self, participant_list): unknown_participants = set(participant_list).difference(self._id_map) if unknown_participants: raise ValueError('unknown participant session id: {}'.format(', '.join(unknown_participants))) if self._active_participants != participant_list: self._active_participants = participant_list self.log.info('active participants: {}'.format(', '.join(self._active_participants) or None)) self._update_bitrate() def add(self, session): assert session not in self._sessions assert session.publisher_id is not None assert session.publisher_id not in self._id_map and session.id not in self._id_map self._sessions.add(session) self._id_map[session.id] = self._id_map[session.publisher_id] = session self.log.info('{session.account_id} has joined the room'.format(session=session)) self._update_bitrate() if self._active_participants: session.owner.notify(sylkrtc.VideoRoomConfigurationEvent(session=session.id, active_participants=self._active_participants, originator='videoroom')) def discard(self, session): if session in self._sessions: self._sessions.discard(session) self._id_map.pop(session.id, None) self._id_map.pop(session.publisher_id, None) self.log.info('{session.account_id} has left the room'.format(session=session)) if session.id in self._active_participants: self._active_participants.remove(session.id) self.log.info('active participants: {}'.format(', '.join(self._active_participants) or None)) for session in self._sessions: session.owner.notify(sylkrtc.VideoRoomConfigurationEvent(session=session.id, active_participants=self._active_participants, originator='videoroom')) self._update_bitrate() def remove(self, session): self._sessions.remove(session) self._id_map.pop(session.id) self._id_map.pop(session.publisher_id) self.log.info('{session.account_id} has left the room'.format(session=session)) if session.id in self._active_participants: self._active_participants.remove(session.id) self.log.info('active participants: {}'.format(', '.join(self._active_participants) or None)) for session in self._sessions: session.owner.notify(sylkrtc.VideoRoomConfigurationEvent(session=session.id, active_participants=self._active_participants, originator='videoroom')) self._update_bitrate() def clear(self): for session in self._sessions: self.log.info('{session.account_id} has left the room'.format(session=session)) self._active_participants = [] self._sessions.clear() self._id_map.clear() def allow_uri(self, uri): config = self.config if config.access_policy == 'allow,deny': return config.allow.match(uri) and not config.deny.match(uri) else: return not config.deny.match(uri) or config.allow.match(uri) def _update_bitrate(self): if self._sessions: if self._active_participants: # todo: should we use max_bitrate / 2 or max_bitrate for each active participant if there are 2 active participants? active_participant_bitrate = self.config.max_bitrate // len(self._active_participants) other_participant_bitrate = 100000 self.log.info('participant bitrate is {} (active) / {} (others)'.format(active_participant_bitrate, other_participant_bitrate)) for session in self._sessions: if session.id in self._active_participants: bitrate = active_participant_bitrate else: bitrate = other_participant_bitrate if session.bitrate != bitrate: session.bitrate = bitrate data = dict(request='configure', room=self.id, bitrate=bitrate) session.owner.protocol.backend.janus_message(session.owner.janus_session_id, session.janus_handle_id, data) else: bitrate = self.config.max_bitrate // limit(len(self._sessions) - 1, min=1) self.log.info('participant bitrate is {}'.format(bitrate)) for session in self._sessions: if session.bitrate != bitrate: session.bitrate = bitrate data = dict(request='configure', room=self.id, bitrate=bitrate) session.owner.protocol.backend.janus_message(session.owner.janus_session_id, session.janus_handle_id, data) # todo: make VideoRoom be a context manager that is retained/released on enter/exit and implement __nonzero__ to be different from __len__ # todo: so that a videoroom is not accidentally released by the last participant leaving while a new participant waits to join # todo: this needs a new model for communication with janus and the client that is pseudo-synchronous (uses green threads) def __len__(self): return len(self._sessions) def __iter__(self): return iter(self._sessions) def __getitem__(self, key): return self._id_map[key] def __contains__(self, item): return item in self._id_map or item in self._sessions class PublisherFeedContainer(object): """A container for the other participant's publisher sessions that we have subscribed to""" def __init__(self): self._publishers = set() self._id_map = {} # map publisher.id -> publisher and publisher.publisher_id -> publisher def add(self, session): assert session not in self._publishers assert session.id not in self._id_map and session.publisher_id not in self._id_map self._publishers.add(session) self._id_map[session.id] = self._id_map[session.publisher_id] = session def discard(self, item): # item can be any of session, session.id or session.publisher_id session = self._id_map[item] if item in self._id_map else item if item in self._publishers else None if session is not None: self._publishers.discard(session) self._id_map.pop(session.id, None) self._id_map.pop(session.publisher_id, None) def remove(self, item): # item can be any of session, session.id or session.publisher_id session = self._id_map[item] if item in self._id_map else item self._publishers.remove(session) self._id_map.pop(session.id) self._id_map.pop(session.publisher_id) def pop(self, item): # item can be any of session, session.id or session.publisher_id session = self._id_map[item] if item in self._id_map else item self._publishers.remove(session) self._id_map.pop(session.id) self._id_map.pop(session.publisher_id) return session def clear(self): self._publishers.clear() self._id_map.clear() def __len__(self): return len(self._publishers) def __iter__(self): return iter(self._publishers) def __getitem__(self, key): return self._id_map[key] def __contains__(self, item): return item in self._id_map or item in self._publishers class VideoRoomSessionInfo(object): slow_download = SlowLinkDescriptor() slow_upload = SlowLinkDescriptor() def __init__(self, id, owner): self.id = id self.owner = owner 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.bitrate = None self.parent_session = None self.slow_download = False self.slow_upload = False self.feeds = PublisherFeedContainer() # keeps references to all the other participant's publisher feeds that we subscribed to def initialize(self, account_id, type, room): assert type in ('publisher', 'subscriber') self.account_id = account_id self.type = type self.room = room self.bitrate = room.config.max_bitrate 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 SessionContainer(object): def __init__(self): self._sessions = set() self._id_map = {} # map session.id -> session and session.janus_handle_id -> session def add(self, session): assert session not in self._sessions assert session.id not in self._id_map and session.janus_handle_id not in self._id_map self._sessions.add(session) self._id_map[session.id] = self._id_map[session.janus_handle_id] = session def discard(self, item): # item can be any of session, session.id or session.janus_handle_id session = self._id_map[item] if item in self._id_map else item if item in self._sessions else None if session is not None: self._sessions.discard(session) self._id_map.pop(session.id, None) self._id_map.pop(session.janus_handle_id, None) def remove(self, item): # item can be any of session, session.id or session.janus_handle_id session = self._id_map[item] if item in self._id_map else item self._sessions.remove(session) self._id_map.pop(session.id) self._id_map.pop(session.janus_handle_id) def pop(self, item): # item can be any of session, session.id or session.janus_handle_id session = self._id_map[item] if item in self._id_map else item self._sessions.remove(session) self._id_map.pop(session.id) self._id_map.pop(session.janus_handle_id) return session def clear(self): self._sessions.clear() self._id_map.clear() def __len__(self): return len(self._sessions) def __iter__(self): return iter(self._sessions) def __getitem__(self, key): return self._id_map[key] def __contains__(self, item): return item in self._id_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.device_id = hashlib.md5(protocol.peer).digest().encode('base64').rstrip('=\n') self.janus_session_id = None self.accounts_map = {} # account ID -> account self.account_handles_map = {} # Janus handle ID -> account self.sip_sessions = SessionContainer() # keeps references to all the SIP sessions created or received by this device self.videoroom_sessions = SessionContainer() # keeps references to all the videoroom sessions created by this participant (as publisher and subscriber) self.ready_event = GreenEvent() self.resolver = DNSLookup() self.proc = proc.spawn(self._operations_handler) self.operations_queue = coros.queue() self.log = ConnectionLogger(self) def start(self): self._create_janus_session() def stop(self): if self.proc is not None: # Kill the operation's handler proc first, in order to not have any operations active while we cleanup. self.proc.kill() # Also proc.kill() will switch to another green thread, which is another reason to do it first so that self.proc = None # we do not switch to another green thread in the middle of the cleanup with a partially deleted handler if self.ready_event.is_set(): assert self.janus_session_id is not None for account_info in self.accounts_map.values(): handle_id = account_info.janus_handle_id if handle_id is not None: self.protocol.backend.janus_detach(self.janus_session_id, handle_id) self.protocol.backend.janus_set_event_handler(handle_id, None) for session in self.sip_sessions: handle_id = session.janus_handle_id if handle_id is not None: self.protocol.backend.janus_detach(self.janus_session_id, handle_id) self.protocol.backend.janus_set_event_handler(handle_id, None) for session in self.videoroom_sessions: handle_id = session.janus_handle_id if handle_id is not None: self.protocol.backend.janus_detach(self.janus_session_id, handle_id) self.protocol.backend.janus_set_event_handler(handle_id, None) session.room.discard(session) session.feeds.clear() self.protocol.backend.janus_stop_keepalive(self.janus_session_id) self.protocol.backend.janus_destroy_session(self.janus_session_id) # cleanup self.ready_event.clear() self.accounts_map.clear() self.account_handles_map.clear() self.sip_sessions.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: self.log.error('could not get WebSocket message type') return self.ready_event.wait() try: model = sylkrtc_models[request_type] except KeyError: self.log.error('unknown WebSocket request type: %s' % request_type) return try: request = model(**data) request.validate() except Exception as e: self.log.error('%s: %s' % (request_type, e)) transaction = data.get('transaction') # we cannot rely on request.transaction as request may not have been created if transaction: self._send_response(sylkrtc.ErrorResponse(transaction=transaction, error=str(e))) return op = Operation(request_type, request) self.operations_queue.send(op) def handle_conference_invite(self, originator, room, invited_uris): for account_id in set(self.accounts_map).intersection(invited_uris): data = dict(sylkrtc='account_event', event='conference_invite', account=account_id, data=dict(originator=dict(uri=originator.id, display_name=originator.display_name), room=room.uri)) room.log.info('invitation from %s for %s', originator.id, account_id) self.log.info('received an invitation from %s for %s to join video room %s', originator.id, account_id, room.uri) self._send_data(json.dumps(data)) def notify(self, event): event.validate() self._send_data(json.dumps(event.to_struct())) # 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): self.protocol.sendMessage(data) def _cleanup_session(self, session): # should only be called from a green thread. if self.janus_session_id is None: # The connection was closed, there is noting to do return if session in self.sip_sessions: self.sip_sessions.remove(session) 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) def _cleanup_videoroom_session(self, session): # should only be called from a green thread. if self.janus_session_id is None: # The connection was closed, there is noting to do return if session in self.videoroom_sessions: self.videoroom_sessions.remove(session) if session.type == 'publisher': session.room.discard(session) session.feeds.clear() 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._maybe_destroy_videoroom(session.room) else: session.parent_session.feeds.discard(session.publisher_id) 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) def _maybe_destroy_videoroom(self, videoroom): # should only be called from a green thread. if self.protocol is None or self.janus_session_id is None: # The connection was closed, there is nothing to do return if videoroom in self.protocol.factory.videorooms and not videoroom: 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 = dict(request='destroy', room=videoroom.id) try: block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data)) except JanusError: pass block_on(self.protocol.backend.janus_detach(self.janus_session_id, handle_id)) self.protocol.backend.janus_set_event_handler(handle_id, None) videoroom.log.info('destroyed') @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 as e: self.log.warning('could not create 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, uri): # 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: sip_uri = SIPURI(host=proxy.host, port=proxy.port, parameters={'transport': proxy.transport}) else: sip_uri = SIPURI.parse('sip:%s' % uri) settings = SIPSimpleSettings() try: routes = self.resolver.lookup_sip_proxy(sip_uri, settings.sip.transport_list).wait() except DNSLookupError as e: raise DNSLookupError('DNS lookup error: {exception!s}'.format(exception=e)) if not routes: raise DNSLookupError('DNS lookup error: no results found') route = random.choice([r for r in routes if r.transport == routes[0].transport]) self.log.debug('DNS lookup for SIP proxy for {} yielded {}'.format(uri, route)) # Build a proxy URI Sofia-SIP likes return 'sips:{route.address}:{route.port}'.format(route=route) if route.transport == 'tls' else str(route.uri) def _handle_janus_event_sip(self, handle_id, event_type, event): # TODO: use a model self.log.debug('janus SIP event: type={event_type} handle_id={handle_id} event={event}'.format(event_type=event_type, handle_id=handle_id, event=event)) 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 self.log.debug('janus video room event: type={event_type} handle_id={handle_id} event={event}'.format(event_type=event_type, handle_id=handle_id, event=event)) 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 as e: self.log.exception('unhandled exception in operation {operation.name!r}: {exception!s}'.format(operation=op, exception=e)) del op, handler def _OH_account_add(self, request): try: if request.account in self.accounts_map: raise APIError('Account {request.account} already added'.format(request=request)) # check if domain is acceptable domain = request.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(request.account, request.password, request.display_name, request.user_agent) self.accounts_map[account_info.id] = account_info except APIError as e: self.log.error('account-add: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) else: self.log.info('added account {request.account} using {request.user_agent}'.format(request=request)) self._send_response(sylkrtc.AckResponse(transaction=request.transaction)) def _OH_account_remove(self, request): try: try: account_info = self.accounts_map.pop(request.account) except KeyError: raise APIError('Unknown account specified: {request.account}'.format(request=request)) # cleanup in case the client didn't unregister before removing the 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, JanusError) as e: self.log.error('account-remove: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) else: self.log.info('removed account {request.account}'.format(request=request)) self._send_response(sylkrtc.AckResponse(transaction=request.transaction)) def _OH_account_register(self, request): try: try: account_info = self.accounts_map[request.account] except KeyError: raise APIError('Unknown account specified: {request.account}'.format(request=request)) proxy = self._lookup_sip_proxy(request.account) 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 = dict(request='register', proxy=proxy, **account_info.user_data) block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data)) except (APIError, DNSLookupError, JanusError) as e: self.log.error('account-register: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) else: self._send_response(sylkrtc.AckResponse(transaction=request.transaction)) def _OH_account_unregister(self, request): try: try: account_info = self.accounts_map[request.account] except KeyError: raise APIError('Unknown account specified: {request.account}'.format(request=request)) 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, JanusError) as e: self.log.error('account-unregister: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) else: self.log.info('unregistered {request.account} from receiving incoming calls'.format(request=request)) self._send_response(sylkrtc.AckResponse(transaction=request.transaction)) def _OH_account_devicetoken(self, request): try: if request.account not in self.accounts_map: raise APIError('Unknown account specified: {request.account}'.format(request=request)) storage = TokenStorage() if request.old_token is not None: storage.remove(request.account, request.old_token) self.log.debug('removed token {request.old_token} for {request.account}'.format(request=request)) if request.new_token is not None: storage.add(request.account, request.new_token) self.log.debug('added token {request.new_token} for {request.account}'.format(request=request)) except APIError as e: self.log.error('account-devicetoken: {exception!s}'.format(exception=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): handle_id = None try: if request.session in self.sip_sessions: raise APIError('Session ID {request.session} already in use'.format(request=request)) try: account_info = self.accounts_map[request.account] except KeyError: raise APIError('Unknown account specified: {request.account}'.format(request=request)) proxy = self._lookup_sip_proxy(request.uri) # 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) data = dict(request='register', send_register=False, proxy=proxy, **account_info.user_data) block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data)) data = dict(request='call', uri='sip:%s' % SIP_PREFIX_RE.sub('', request.uri), srtp='sdes_optional') jsep = dict(type='offer', sdp=request.sdp) block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data, jsep)) session_info = SIPSessionInfo(request.session) session_info.janus_handle_id = handle_id session_info.init_outgoing(request.account, request.uri) self.sip_sessions.add(session_info) except (APIError, DNSLookupError, JanusError) as e: self.log.error('session-create: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) 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) else: self.log.info('created outgoing session {request.session} from {request.account} to {request.uri}'.format(request=request)) self._send_response(sylkrtc.AckResponse(transaction=request.transaction)) def _OH_session_answer(self, request): try: try: session_info = self.sip_sessions[request.session] except KeyError: raise APIError('Unknown session specified: {request.session}'.format(request=request)) if session_info.direction != 'incoming': raise APIError('Cannot answer outgoing session {request.session}'.format(request=request)) if session_info.state != 'connecting': raise APIError('Invalid state for answering session {session.id}: {session.state}'.format(session=session_info)) data = dict(request='accept') jsep = dict(type='answer', sdp=request.sdp) block_on(self.protocol.backend.janus_message(self.janus_session_id, session_info.janus_handle_id, data, jsep)) except (APIError, JanusError) as e: self.log.error('session-answer: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) else: self.log.info('answered incoming session {session.id}'.format(session=session_info)) self._send_response(sylkrtc.AckResponse(transaction=request.transaction)) def _OH_session_trickle(self, request): try: try: session_info = self.sip_sessions[request.session] except KeyError: raise APIError('Unknown session specified: {request.session}'.format(request=request)) if session_info.state == 'terminated': raise APIError('Session {request.session} is terminated'.format(request=request)) candidates = [c.to_struct() for c in request.candidates] block_on(self.protocol.backend.janus_trickle(self.janus_session_id, session_info.janus_handle_id, candidates)) except (APIError, JanusError) as e: self.log.error('session-trickle: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) else: if not candidates: self.log.debug('session {session.id} negotiated ICE'.format(session=session_info)) self._send_response(sylkrtc.AckResponse(transaction=request.transaction)) def _OH_session_terminate(self, request): try: try: session_info = self.sip_sessions[request.session] except KeyError: raise APIError('Unknown session specified: {request.session}'.format(request=request)) if session_info.state not in ('connecting', 'progress', 'accepted', 'established'): raise APIError('Invalid state for terminating session {session.id}: {session.state}'.format(session=session_info)) if session_info.direction == 'incoming' and session_info.state == 'connecting': data = dict(request='decline', code=486) else: data = dict(request='hangup') block_on(self.protocol.backend.janus_message(self.janus_session_id, session_info.janus_handle_id, data)) except (APIError, JanusError) as e: self.log.error('session-terminate: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) else: self.log.info('requested termination for session {session.id}'.format(session=session_info)) self._send_response(sylkrtc.AckResponse(transaction=request.transaction)) def _OH_videoroom_join(self, request): videoroom = None handle_id = None try: if request.session in self.videoroom_sessions: raise APIError('Session ID {request.session} already in use'.format(request=request)) try: account_info = self.accounts_map[request.account] except KeyError: raise APIError('Unknown account specified: {request.account}'.format(request=request)) try: videoroom = self.protocol.factory.videorooms[request.uri] except KeyError: videoroom = VideoRoom(request.uri) self.protocol.factory.videorooms.add(videoroom) if not videoroom.allow_uri(request.account): raise APIError('{request.account} is not allowed to join room {request.uri}'.format(request=request)) 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 config = videoroom.config data = dict(request='create', room=videoroom.id, publishers=10, bitrate=config.max_bitrate, videocodec=config.video_codec, record=config.record, rec_dir=config.recording_dir) try: block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data)) except JanusError as e: if e.code != 427: # 427 means room already exists raise # join the room data = dict(request='joinandconfigure', room=videoroom.id, ptype='publisher', audio=True, video=True) if account_info.display_name: data.update(display=account_info.display_name) jsep = dict(type='offer', sdp=request.sdp) block_on(self.protocol.backend.janus_message(self.janus_session_id, handle_id, data, jsep)) videoroom_session = VideoRoomSessionInfo(request.session, owner=self) videoroom_session.janus_handle_id = handle_id videoroom_session.initialize(request.account, 'publisher', videoroom) self.videoroom_sessions.add(videoroom_session) except (APIError, JanusError) as e: self.log.error('videoroom-join: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) 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._maybe_destroy_videoroom(videoroom) else: self.log.info('created session {request.session} from account {request.account} to video room {request.uri}'.format(request=request)) 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): try: option_name = request.option.replace('-', '_') if getattr(request, option_name) is None: raise APIError('missing {!r} field in request'.format(option_name)) sub_handler = getattr(self, '_OH_videoroom_ctl_{}'.format(option_name)) sub_handler(request) except (APIError, JanusError) as e: self.log.error('videoroom-ctl: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) else: self._send_response(sylkrtc.AckResponse(transaction=request.transaction)) def _OH_videoroom_ctl_configure_room(self, request): try: videoroom_session = self.videoroom_sessions[request.session] except KeyError: raise APIError('configure-room: unknown video room session: {request.session}'.format(request=request)) videoroom = videoroom_session.room + # todo: should we send out events if the active participant list did not change? try: videoroom.active_participants = request.configure_room.active_participants except ValueError as e: raise APIError('configure-room: {exception!s}'.format(exception=e)) for session in videoroom: session.owner.notify(sylkrtc.VideoRoomConfigurationEvent(session=session.id, active_participants=videoroom.active_participants, originator=request.session)) def _OH_videoroom_ctl_feed_attach(self, request): if request.feed_attach.session in self.videoroom_sessions: raise APIError('feed-attach: video room session ID {request.feed_attach.session} already in use'.format(request=request)) # 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: {request.session}'.format(request=request)) # get the publisher's session try: publisher_session = base_session.room[request.feed_attach.publisher] except KeyError: raise APIError('feed-attach: unknown publisher video room session to attach to: {request.feed_attach.publisher}'.format(request=request)) if publisher_session.publisher_id is None: raise APIError('feed-attach: video room session {session.id} does not have a publisher ID'.format(session=publisher_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) # join the room as a listener try: data = dict(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)) except JanusError: try: block_on(self.protocol.backend.janus_detach(self.janus_session_id, handle_id)) except JanusError: pass self.protocol.backend.janus_set_event_handler(handle_id, None) raise videoroom_session = VideoRoomSessionInfo(request.feed_attach.session, owner=self) 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.add(publisher_session) def _OH_videoroom_ctl_feed_answer(self, request): try: videoroom_session = self.videoroom_sessions[request.feed_answer.session] except KeyError: raise APIError('feed-answer: unknown video room session: {request.feed_answer.session}'.format(request=request)) data = dict(request='start', room=videoroom_session.room.id) jsep = dict(type='answer', sdp=request.feed_answer.sdp) block_on(self.protocol.backend.janus_message(self.janus_session_id, videoroom_session.janus_handle_id, data, jsep)) def _OH_videoroom_ctl_feed_detach(self, request): try: videoroom_session = self.videoroom_sessions[request.feed_detach.session] except KeyError: raise APIError('feed-detach: unknown video room session to detach: {request.feed_detach.session}'.format(request=request)) if videoroom_session.parent_session.id != request.session: raise APIError('feed-detach: {request.feed_detach.session} is not an attached feed of {request.session}'.format(request=request)) data = dict(request='leave') block_on(self.protocol.backend.janus_message(self.janus_session_id, videoroom_session.janus_handle_id, data)) self._cleanup_videoroom_session(videoroom_session) def _OH_videoroom_ctl_invite_participants(self, request): 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: {request.session}'.format(request=request)) for protocol in self.protocol.factory.connections.difference([self.protocol]): protocol.connection_handler.handle_conference_invite(account_info, base_session.room, request.invite_participants.participants) def _OH_videoroom_ctl_trickle(self, request): session = request.trickle.session or request.session try: videoroom_session = self.videoroom_sessions[session] except KeyError: raise APIError('trickle: unknown video room session: {session}'.format(session=session)) candidates = [c.to_struct() for c in request.trickle.candidates] block_on(self.protocol.backend.janus_trickle(self.janus_session_id, videoroom_session.janus_handle_id, candidates)) if not candidates and videoroom_session.type == 'publisher': self.log.debug('video room session {session.id} negotiated ICE'.format(session=videoroom_session)) def _OH_videoroom_ctl_update(self, request): try: videoroom_session = self.videoroom_sessions[request.session] except KeyError: raise APIError('update: unknown video room session: {request.session}'.format(request=request)) update_data = request.update.to_struct() if update_data: data = dict(request='configure', room=videoroom_session.room.id, **update_data) block_on(self.protocol.backend.janus_message(self.janus_session_id, videoroom_session.janus_handle_id, data)) modified = ', '.join('{}={}'.format(key, update_data[key]) for key in update_data) self.log.info('updated video room session {request.session} with {modified}'.format(request=request, modified=modified)) def _OH_videoroom_terminate(self, request): try: try: videoroom_session = self.videoroom_sessions[request.session] except KeyError: raise APIError('Unknown video room session: {request.session}'.format(request=request)) data = dict(request='leave') block_on(self.protocol.backend.janus_message(self.janus_session_id, videoroom_session.janus_handle_id, data)) except (APIError, JanusError) as e: self.log.error('videoroom-terminate: {exception!s}'.format(exception=e)) self._send_response(sylkrtc.ErrorResponse(transaction=request.transaction, error=str(e))) else: self.log.info('requesting termination for video room session {request.session}'.format(request=request)) 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)) # safety net in case we do not get any answer for the leave request # todo: to be adjusted later after pseudo-synchronous communication with janus is implemented reactor.callLater(2, call_in_green_thread, self._cleanup_videoroom_session, videoroom_session) # 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.sip_sessions[handle_id] except KeyError: self.log.warning('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)) self._send_data(json.dumps(data)) # TODO: SessionEvent model self.log.debug('{session.direction} session {session.id} state: {session.state}'.format(session=session_info)) self.log.info('established WEBRTC connection for session {session.id}'.format(session=session_info)) elif event_type == 'hangup': try: session_info = self.sip_sessions[handle_id] except KeyError: return if session_info.state != 'terminated': session_info.state = 'terminated' self.log.debug('{session.direction} session {session.id} state: {session.state}'.format(session=session_info)) reason = event.get('reason', 'reason unspecified') 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.log.info('{session.direction} session {session.id} terminated ({reason})'.format(session=session_info, reason=reason)) self._cleanup_session(session_info) elif event_type in ('media', 'detached'): # ignore pass elif event_type == 'slowlink': try: session_info = self.sip_sessions[handle_id] except KeyError: self.log.warning('could not find session for handle ID %s' % handle_id) return try: uplink = data['event']['uplink'] except KeyError: self.log.warning('could not find uplink in slowlink event data') return if uplink: # uplink is from janus' point of view if not session_info.slow_download: self.log.info('poor download connectivity for session {session.id}'.format(session=session_info)) session_info.slow_download = True else: if not session_info.slow_upload: self.log.info('poor upload connectivity for session {session.id}'.format(session=session_info)) session_info.slow_upload = True else: self.log.warning('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 = plugin_data['data'] assert event_data.get('sip') == 'event' if 'result' not in event_data: self.log.warning('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: self.log.warning('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.sip_sessions.add(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'])) self.log.info('received incoming session {session.id} from {session.remote_identity.uri!s} to {session.local_identity.uri!s}'.format(session=session)) 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': registration_data['reason'] = reason = '{0[code]} {0[reason]}'.format(event_data) self.log.info('registration for {account.id} failed: {reason}'.format(account=account_info, reason=reason)) elif registration_state == 'registered': self.log.info('registered {account.id} to receive incoming calls'.format(account=account_info)) 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'): # session event try: session_info = self.sip_sessions[handle_id] except KeyError: self.log.warning('could not find session for handle ID %s' % handle_id) return state_map = dict(calling='progress', accepted='accepted') session_info.state = state_map[event_type] self.log.debug('{session.direction} session {session.id} state: {session.state}'.format(session=session_info)) data = dict(sylkrtc='session_event', session=session_info.id, event='state', data=dict(state=session_info.state)) if session_info.state == 'accepted' and session_info.direction == 'outgoing': assert jsep is not None data['data']['sdp'] = jsep['sdp'] self._send_data(json.dumps(data)) # TODO: SessionEvent model elif event_type == 'hangup': # session hangup event try: session_info = self.sip_sessions[handle_id] except KeyError: return if session_info.state != 'terminated': session_info.state = 'terminated' self.log.debug('{session.direction} session {session.id} state: {session.state}'.format(session=session_info)) code = event_data.get('code', 0) reason = '%d %s' % (code, event_data.get('reason', 'Unknown')) data = dict(sylkrtc='session_event', session=session_info.id, event='state', data=dict(state=session_info.state, reason=reason)) self._send_data(json.dumps(data)) # TODO: SessionEvent model if session_info.direction == 'incoming' and code == 487: # check if missed incoming call data = dict(sylkrtc='account_event', account=session_info.account_id, event='missed_session', data=dict(originator=session_info.remote_identity.__dict__)) self._send_data(json.dumps(data)) # TODO: AccountEvent model if code >= 300: self.log.info('{session.direction} session {session.id} terminated ({reason})'.format(session=session_info, reason=reason)) else: self.log.info('{session.direction} session {session.id} terminated'.format(session=session_info)) self._cleanup_session(session_info) elif event_type == 'missed_call': try: account_info = self.account_handles_map[handle_id] except KeyError: self.log.warning('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__)) self.log.info('missed incoming call from {originator.uri}'.format(originator=originator)) # TODO: AccountEvent model self._send_data(json.dumps(data)) elif event_type in ('ack', 'declining', 'hangingup', 'proceeding'): pass # ignore else: self.log.warning('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: self.log.warning('could not find video room session for handle ID %s during webrtcup event' % handle_id) return if videoroom_session.type == 'publisher': self.log.info('established WEBRTC connection for session {session.id}'.format(session=videoroom_session)) data = dict(sylkrtc='videoroom_event', session=videoroom_session.id, event='state', data=dict(state='established')) else: data = dict(sylkrtc='videoroom_event', session=videoroom_session.parent_session.id, event='feed_established', data=dict(state='established', subscription=videoroom_session.id)) self._send_data(json.dumps(data)) elif event_type == 'hangup': try: videoroom_session = self.videoroom_sessions[handle_id] except KeyError: return self._cleanup_videoroom_session(videoroom_session) elif event_type in ('media', 'detached'): pass elif event_type == 'slowlink': try: videoroom_session = self.videoroom_sessions[handle_id] except KeyError: self.log.warning('could not find video room session for handle ID %s during slowlink event' % handle_id) return try: uplink = data['event']['uplink'] except KeyError: self.log.error('could not find uplink in slowlink event data') return if uplink: # uplink is from janus' point of view if not videoroom_session.slow_download: self.log.info('poor download connectivity to video room {session.room.uri} with session {session.id}'.format(session=videoroom_session)) videoroom_session.slow_download = True else: if not videoroom_session.slow_upload: self.log.info('poor upload connectivity to video room {session.room.uri} with session {session.id}'.format(session=videoroom_session)) videoroom_session.slow_upload = True else: self.log.warning('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: self.log.warning('could not find video room session for handle ID %s during joined event' % handle_id) return self.log.info('joined video room {session.room.uri} with session {session.id}'.format(session=videoroom_session)) videoroom_session.publisher_id = event_data['id'] room = videoroom_session.room 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 publisher in event_data['publishers']: publisher_id = publisher['id'] try: publisher_session = room[publisher_id] except KeyError: self.log.warning('could not find matching session for publisher %s during joined event' % publisher_id) continue publishers.append(dict(id=publisher_session.id, uri=publisher_session.account_id, display_name=publisher.get('display', ''))) data = dict(sylkrtc='videoroom_event', session=videoroom_session.id, event='initial_publishers', data=dict(publishers=publishers)) self._send_data(json.dumps(data)) room.add(videoroom_session) # adding the session to the room might also trigger sending an event with the active participants which must be sent last elif event_type == 'event': if 'publishers' in event_data: try: videoroom_session = self.videoroom_sessions[handle_id] except KeyError: self.log.warning('could not find video room session for handle ID %s during publishers event' % handle_id) return room = videoroom_session.room # send information about new publishers publishers = [] for publisher in event_data['publishers']: publisher_id = publisher['id'] try: publisher_session = room[publisher_id] except KeyError: self.log.warning('could not find matching session for publisher %s during publishers event' % publisher_id) continue publishers.append(dict(id=publisher_session.id, uri=publisher_session.account_id, display_name=publisher.get('display', ''))) 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: janus_publisher_id = event_data['leaving'] # janus_publisher_id == 'ok' when the event is about ourselves leaving the room try: base_session = self.videoroom_sessions[handle_id] except KeyError: if janus_publisher_id != 'ok': self.log.warning('could not find video room session for handle ID %s during leaving event' % handle_id) return if janus_publisher_id == 'ok': self.log.info('left video room {session.room.uri} with session {session.id}'.format(session=base_session)) self._cleanup_videoroom_session(base_session) return try: publisher_session = 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_session.id])) self._send_data(json.dumps(data)) elif {'started', 'unpublished', 'left', 'configured'}.intersection(event_data): pass else: self.log.warning('received unexpected video room plugin event: type={} data={}'.format(event_type, event_data)) elif event_type == 'attached': # sent when a feed is subscribed for a given publisher try: videoroom_session = self.videoroom_sessions[handle_id] except KeyError: self.log.warning('could not find video room session for handle ID %s during attached event' % handle_id) return # get the session which originated the subscription base_session = videoroom_session.parent_session jsep = event.get('jsep', None) assert base_session is not 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: self.log.warning('received unexpected video room plugin event: type={} data={}'.format(event_type, event_data))