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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
# optional, for better performance
try:
import uvloop
except ImportError:
uvloop = None
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
async def run_answer(pc, signaling, fp):
await signaling.connect()
@pc.on("datachannel")
def on_datachannel(channel):
start = time.time()
octets = 0
@channel.on("message")
async def on_message(message):
nonlocal octets
if message:
octets += len(message)
fp.write(message)
else:
elapsed = time.time() - start
print(
"received %d bytes in %.1f s (%.3f Mbps)"
% (octets, elapsed, octets * 8 / elapsed / 1000000)
)
# say goodbye
await signaling.send(BYE)
await consume_signaling(pc, signaling)
async def run_offer(pc, signaling, fp):
await signaling.connect()
done_reading = False
channel = pc.createDataChannel("filexfer")
def send_data():
nonlocal done_reading
while (
channel.bufferedAmount <= channel.bufferedAmountLowThreshold
) and not done_reading:
data = fp.read(16384)
channel.send(data)
if not data:
done_reading = True
channel.on("bufferedamountlow", send_data)
channel.on("open", send_data)
# 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 channel file transfer")
parser.add_argument("role", choices=["send", "receive"])
parser.add_argument("filename")
parser.add_argument("--verbose", "-v", action="count")
add_signaling_arguments(parser)
args = parser.parse_args()
if args.verbose:
logging.basicConfig(level=logging.DEBUG)
if uvloop is not None:
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
signaling = create_signaling(args)
pc = RTCPeerConnection()
if args.role == "send":
fp = open(args.filename, "rb")
coro = run_offer(pc, signaling, fp)
else:
fp = open(args.filename, "wb")
coro = run_answer(pc, signaling, fp)
# run event loop
loop = asyncio.get_event_loop()
try:
loop.run_until_complete(coro)
except KeyboardInterrupt:
pass
finally:
fp.close()
loop.run_until_complete(pc.close())
loop.run_until_complete(signaling.close())
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