rtcllm/rtcllm/rtc.py

import asyncio
import json
from functools import partial

from appPublic.dictObject import DictObject
from aiortc import MediaStreamTrack, RTCPeerConnection, RTCSessionDescription, RTCIceCandidate
from aiortc.contrib.media import MediaBlackhole, MediaPlayer, MediaRecorder, MediaRelay

# from websockets.asyncio.client import connect
from websockets.asyncio.client import connect
import websockets

from vad import AudioTrackVad

class RTCLLM:
	def __init__(self, ws_url, iceServers):
		self.ws_url = ws_url
		self.iceServers = iceServers
		self.peers = DictObject()
		self.info = {
			'id':'rtcllm_agent',
			'name':'rtcllm_agent'
		}
		self.dc = None

	def get_pc(self, data):
		return self.peers[data['from'].id].pc

	async def run(self):
		async with  connect(self.ws_url) as self.ws:
			await self.login()
			while True:
				msg = await self.ws.recv()
				data = DictObject(**json.loads(msg))
				d = data.data
				print(f'ws recv(): {d.type=}')
				func = self.handlers.get(d.type)
				if func:
					f = partial(func, self)
					await f(d)
			self.ws.close()

	async def login(self):
		await self.ws.send(json.dumps({
			'type':'login',
			'info':self.info
		}))

	async def on_icecandidate(self, pc, candidate):
		print('on_icecandidate()', self, pc, candidate)
		if candidate:
			await self.ws.send(json.dumps({
				"type":"candidate",
				"candidate":candidate,
			}))

	async def save_onlineList(self, data):
		print(f'{self}, {type(self)}')
		self.onlineList = data.onlineList
	
	async def vad_voiceend(self, fn):
		print(f'vad_voiceend():{fn=}')

	async def auto_accept_call(self, data):
		opts = DictObject(iceServers=self.iceServers)
		pc = RTCPeerConnection(opts)
		self.peers[data['from'].id] = DictObject(**{
			'info':data['from'],
			'pc':pc
		})
		print(f'{opts=}, {pc=}, {pc.myconfiguration=}')
		await self.ws.send(json.dumps({'type':'callAccepted', 'to':data['from']}))
	
	async def pc_track(self, peerid, track):
		peer = self.peers[peerid]
		pc = peer.pc
		if track.kind == 'audio':
			vadtrack = AudioTrackVad(track, stage=3, onvoiceend=self.vad_voiceend)
			peer.vadtrack = vadtrack
			vadtrack.start_vad()

	async def pc_connectionState_changed(self, peerid):
		peer = self.peers[peerid]
		pc = peer.pc
		print(f'************************************{pc.connectionState=}')
		if pc.connectionState == 'connected':
			peer.dc = await pc.createDataChannel(peer.info.name)
			return
		if pc.connectionState == 'closed':
			await pc.close()
			if peer.dc:
				await peer.dc.close()

			peers = {
				k:v for k,v in self.peers.items() if k != peerid
			}
			self.peers = peers
			if len([k for k in self.peers.keys()]) == 0:
				await self.ws.close()

	async def response_offer(self, data):
		pc = self.get_pc(data)
		if pc is None:
			print(f'{self.peers=}, {data=}')
			return
		pc.on("connectionstate", partial(self.pc_connectionState_changed, data['from'].id))
		pc.on('track', partial(self.pc_track, data['from'].id))
		pc.on('icecandidate', partial(self.on_icecandidate, pc))
		offer = RTCSessionDescription(** data.offer)
		await pc.setRemoteDescription(offer)
		answer = await pc.createAnswer()
		await pc.setLocalDescription(answer)
		await self.ws.send(json.dumps({
			'type':'answer',
			'answer':{'type':pc.localDescription.type, 'sdp':pc.localDescription.sdp},
			'to':data['from']
		}))
	
	async def accept_answer(self, data):
		pc = self.get_pc(data)
		answer = RTCSessionDescription(data.answer);
		pc.setRemoteDescription(answer)
	
	async def accept_iceCandidate(self, data):
		pc = self.get_pc(data)
		candidate = data.candidate
		ip = candidate['candidate'].split(' ')[4]
		port = candidate['candidate'].split(' ')[5]
		protocol = candidate['candidate'].split(' ')[7]
		priority = candidate['candidate'].split(' ')[3]
		foundation = candidate['candidate'].split(' ')[0]
		component = candidate['candidate'].split(' ')[1]
		type = candidate['candidate'].split(' ')[7]
		rtc_candidate = RTCIceCandidate(
			ip=ip,
			port=port,
			protocol=protocol,
			priority=priority,
			foundation=foundation,
			component=component,
			type=type,
			sdpMid=candidate['sdpMid'],
			sdpMLineIndex=candidate['sdpMLineIndex']
		)
		await pc.addIceCandidate(rtc_candidate)
		print('addIceCandidate ok')

	handlers = {
		'onlineList':save_onlineList,
		'callRequest':auto_accept_call,
		'offer':response_offer,
		'answer':accept_answer,
		'iceCandidate':accept_iceCandidate,
	}

async def main():
	agent = RTCLLM(ws_url='wss://sage.opencomputing.cn/wss/ws/rtc_signaling.ws',
					iceServers=[{
						'urls':'stun:stun.opencomputing.cn'},{
						'urls':'turn:stun.opencomputing.cn',
						'username':'turn',
						'credential':'server'
					}])
	print('running ...')
	await agent.run()

if __name__ == '__main__':
	asyncio.run(main())