1a127bec6f
- Uses thread.capnp - Follows same format as thread_client.py/thread_server.py and async_client.py/async_server.py - Including a basic self signed certificate for testing convenience - Python 3.7 has a bug cleaning up SSL when using asyncio.run https://bugs.python.org/issue36709 Have a slightly more verbose workaround to do proper cleanup
104 lines
2.5 KiB
Python
Executable File
104 lines
2.5 KiB
Python
Executable File
#!/usr/bin/env python
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from __future__ import print_function
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import asyncio
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import argparse
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import threading
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import time
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import capnp
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import socket
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import ssl
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import thread_capnp
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capnp.remove_event_loop()
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capnp.create_event_loop(threaded=True)
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def parse_args():
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parser = argparse.ArgumentParser(usage='Connects to the Example thread server \
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at the given address and does some RPCs')
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parser.add_argument("host", help="HOST:PORT")
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return parser.parse_args()
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class StatusSubscriber(thread_capnp.Example.StatusSubscriber.Server):
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'''An implementation of the StatusSubscriber interface'''
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def status(self, value, **kwargs):
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print('status: {}'.format(time.time()))
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async def myreader(client, reader):
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while True:
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data = await reader.read(4096)
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client.write(data)
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async def mywriter(client, writer):
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while True:
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data = await client.read(4096)
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writer.write(data.tobytes())
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await writer.drain()
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async def background(cap):
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subscriber = StatusSubscriber()
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promise = cap.subscribeStatus(subscriber)
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await promise.a_wait()
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async def main(host):
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host = host.split(':')
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addr = host[0]
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port = host[1]
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# Setup SSL context
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ctx = ssl.create_default_context(ssl.Purpose.SERVER_AUTH, cafile='selfsigned.cert')
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# Handle both IPv4 and IPv6 cases
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try:
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print("Try IPv4")
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reader, writer = await asyncio.open_connection(
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addr, port,
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ssl=ctx,
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)
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except:
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print("Try IPv6")
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reader, writer = await asyncio.open_connection(
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addr, port,
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ssl=ctx,
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family=socket.AF_INET6
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)
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# Start TwoPartyClient using TwoWayPipe (takes no arguments in this mode)
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client = capnp.TwoPartyClient()
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cap = client.bootstrap().cast_as(thread_capnp.Example)
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# Assemble reader and writer tasks, run in the background
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coroutines = [myreader(client, reader), mywriter(client, writer)]
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asyncio.gather(*coroutines, return_exceptions=True)
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# Start background task for subscriber
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tasks = [background(cap)]
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asyncio.gather(*tasks, return_exceptions=True)
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# Run blocking tasks
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print('main: {}'.format(time.time()))
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await cap.longRunning().a_wait()
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print('main: {}'.format(time.time()))
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await cap.longRunning().a_wait()
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print('main: {}'.format(time.time()))
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await cap.longRunning().a_wait()
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print('main: {}'.format(time.time()))
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if __name__ == '__main__':
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# Using asyncio.run hits an asyncio ssl bug
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# https://bugs.python.org/issue36709
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#asyncio.run(main(parse_args().host), loop=loop, debug=True)
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loop = asyncio.get_event_loop()
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loop.run_until_complete(main(parse_args().host))
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