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import argparse
import asyncio
import logging
import time
from aiortc import RTCIceCandidate, RTCPeerConnection, RTCSessionDescription
from aiortc.contrib.signaling import BYE, add_signaling_arguments, create_signaling
def channel_log(channel, t, message):
print("channel(%s) %s %s" % (channel.label, t, message))
def channel_send(channel, message):
channel_log(channel, ">", message)
channel.send(message)
async def consume_signaling(pc, signaling):
while True:
obj = await signaling.receive()
if isinstance(obj, RTCSessionDescription):
await pc.setRemoteDescription(obj)
if obj.type == "offer":
# send answer
await pc.setLocalDescription(await pc.createAnswer())
await signaling.send(pc.localDescription)
elif isinstance(obj, RTCIceCandidate):
await pc.addIceCandidate(obj)
elif obj is BYE:
print("Exiting")
break
time_start = None
def current_stamp():
global time_start
if time_start is None:
time_start = time.time()
return 0
else:
return int((time.time() - time_start) * 1000000)
async def run_answer(pc, signaling):
await signaling.connect()
@pc.on("datachannel")
def on_datachannel(channel):
channel_log(channel, "-", "created by remote party")
@channel.on("message")
def on_message(message):
channel_log(channel, "<", message)
if isinstance(message, str) and message.startswith("ping"):
# reply
channel_send(channel, "pong" + message[4:])
await consume_signaling(pc, signaling)
async def run_offer(pc, signaling):
await signaling.connect()
channel = pc.createDataChannel("chat")
channel_log(channel, "-", "created by local party")
async def send_pings():
while True:
channel_send(channel, "ping %d" % current_stamp())
await asyncio.sleep(1)
@channel.on("open")
def on_open():
asyncio.ensure_future(send_pings())
@channel.on("message")
def on_message(message):
channel_log(channel, "<", message)
if isinstance(message, str) and message.startswith("pong"):
elapsed_ms = (current_stamp() - int(message[5:])) / 1000
print(" RTT %.2f ms" % elapsed_ms)
# send offer
await pc.setLocalDescription(await pc.createOffer())
await signaling.send(pc.localDescription)
await consume_signaling(pc, signaling)
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Data channels ping/pong")
parser.add_argument("role", choices=["offer", "answer"])
parser.add_argument("--verbose", "-v", action="count")
add_signaling_arguments(parser)
args = parser.parse_args()
if args.verbose:
logging.basicConfig(level=logging.DEBUG)
signaling = create_signaling(args)
pc = RTCPeerConnection()
if args.role == "offer":
coro = run_offer(pc, signaling)
else:
coro = run_answer(pc, signaling)
# run event loop
loop = asyncio.get_event_loop()
try:
loop.run_until_complete(coro)
except KeyboardInterrupt:
pass
finally:
loop.run_until_complete(pc.close())
loop.run_until_complete(signaling.close())
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