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#!/usr/bin/env python
#
# This file is part of pySerial-asyncio - Cross platform serial port support for Python
# (C) 2016 pySerial-team
#
# SPDX-License-Identifier: BSD-3-Clause
"""\
Test asyncio related functionality.
To run from the command line with a specific port with a loop-back,
device connected, use:
$ cd pyserial-asyncio
$ python -m test.test_asyncio SERIALDEVICE
"""
import os
import unittest
import asyncio
from typing import Optional
import serial_asyncio_fast
HOST = "127.0.0.1"
_PORT = 8888
# on which port should the tests be performed:
PORT = "socket://%s:%s" % (HOST, _PORT)
@unittest.skipIf(os.name != "posix", "asyncio not supported on platform")
class Test_asyncio(unittest.TestCase):
"""Test asyncio related functionality"""
def setUp(self):
self.loop = asyncio.get_event_loop()
# create a closed serial port
def tearDown(self):
self.loop.close()
def test_asyncio(self):
TEXT = b"Hello, World!"
COUNT = 1024
COMPLETE_MESSAGE = TEXT * COUNT + b"\n"
received = []
actions = []
done = asyncio.Event()
class Input(asyncio.Protocol):
def __init__(self):
super().__init__()
self._transport = None
def connection_made(self, transport: serial_asyncio_fast.SerialTransport):
self._transport = transport
def data_received(self, data):
self._transport.write(data)
class Output(asyncio.Protocol):
def __init__(self):
super().__init__()
self._transport: Optional[serial_asyncio_fast.SerialTransport] = None
def connection_made(self, transport: serial_asyncio_fast.SerialTransport):
self._transport = transport
actions.append("open")
for _ in range(COUNT):
transport.write(TEXT)
transport.write(b"\n")
def data_received(self, data):
received.append(data)
if b"\n" in data:
self._transport.close()
def connection_lost(self, exc):
actions.append("close")
done.set()
def pause_writing(self):
actions.append("pause")
print(self._transport.get_write_buffer_size())
def resume_writing(self):
actions.append("resume")
print(self._transport.get_write_buffer_size())
if PORT.startswith("socket://"):
coro = self.loop.create_server(Input, HOST, _PORT)
self.loop.run_until_complete(coro)
client = serial_asyncio_fast.create_serial_connection(self.loop, Output, PORT)
self.loop.run_until_complete(client)
self.loop.run_until_complete(done.wait())
pending = asyncio.all_tasks(self.loop)
self.loop.run_until_complete(asyncio.gather(*pending))
for _ in range(1024):
self.loop.run_until_complete(asyncio.sleep(0))
all_data = b"".join(received)
self.assertEqual(all_data, COMPLETE_MESSAGE)
self.assertEqual(actions, ["open", "close"])
if __name__ == "__main__":
import sys
sys.stdout.write(__doc__)
if len(sys.argv) > 1:
PORT = sys.argv[1]
sys.stdout.write("Testing port: %r\n" % PORT)
sys.argv[1:] = ["-v"]
# When this module is executed from the command-line, it runs all its tests
unittest.main()
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