101 lines
2.7 KiB
Python
101 lines
2.7 KiB
Python
"""Like source.py, but uses streams."""
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from __future__ import print_function
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import argparse
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import sys
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from trollius import *
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from trollius import test_utils
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ARGS = argparse.ArgumentParser(description="TCP data sink example.")
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ARGS.add_argument(
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'--tls', action='store_true', dest='tls',
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default=False, help='Use TLS')
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ARGS.add_argument(
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'--iocp', action='store_true', dest='iocp',
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default=False, help='Use IOCP event loop (Windows only)')
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ARGS.add_argument(
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'--stop', action='store_true', dest='stop',
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default=False, help='Stop the server by sending it b"stop" as data')
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ARGS.add_argument(
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'--host', action='store', dest='host',
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default='127.0.0.1', help='Host name')
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ARGS.add_argument(
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'--port', action='store', dest='port',
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default=1111, type=int, help='Port number')
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ARGS.add_argument(
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'--size', action='store', dest='size',
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default=16*1024, type=int, help='Data size')
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class Debug:
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"""A clever little class that suppresses repetitive messages."""
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overwriting = False
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label = 'stream1:'
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def print_(self, *args):
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if self.overwriting:
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print(file=sys.stderr)
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self.overwriting = 0
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print(self.label, *args, file=sys.stderr)
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def oprint(self, *args):
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self.overwriting += 1
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end = '\n'
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if self.overwriting >= 3:
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if self.overwriting == 3:
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print(self.label, '[...]', file=sys.stderr)
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end = '\r'
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print(self.label, *args, file=sys.stderr, end=end)
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sys.stdout.flush()
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@coroutine
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def start(loop, args):
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d = Debug()
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total = 0
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sslctx = None
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if args.tls:
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d.print_('using dummy SSLContext')
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sslctx = test_utils.dummy_ssl_context()
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r, w = yield From(open_connection(args.host, args.port, ssl=sslctx))
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d.print_('r =', r)
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d.print_('w =', w)
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if args.stop:
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w.write(b'stop')
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w.close()
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else:
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size = args.size
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data = b'x'*size
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try:
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while True:
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total += size
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d.oprint('writing', size, 'bytes; total', total)
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w.write(data)
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f = w.drain()
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if f:
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d.print_('pausing')
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yield From(f)
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except (ConnectionResetError, BrokenPipeError) as exc:
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d.print_('caught', repr(exc))
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def main():
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global args
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args = ARGS.parse_args()
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if args.iocp:
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from trollius.windows_events import ProactorEventLoop
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loop = ProactorEventLoop()
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set_event_loop(loop)
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else:
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loop = get_event_loop()
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try:
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loop.run_until_complete(start(loop, args))
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finally:
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loop.close()
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if __name__ == '__main__':
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main()
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