Cezary Wagner <[email protected]> added the comment:
Another code try - this time I am using task:
import asyncio
import sys
async def process_line_reader(process, on_line=None, on_eof=None):
while not process.stdout.at_eof():
# BUG? after first line it becomes dead
line = await process.stdout.readline()
if on_line is not None:
on_line(line.decode())
if on_eof is not None:
on_eof()
print('eof')
async def run_stockfish():
STOCKFISH_PATH = r'C:\root\chess\stockfish\stockfish
10\stockfish_10_x64_bmi2.exe'
stockfish = await asyncio.subprocess.create_subprocess_exec(
STOCKFISH_PATH,
stdin=asyncio.subprocess.PIPE,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.PIPE)
stockfish.stdin.write('uci'.encode())
task = asyncio.create_task(process_line_reader(
process=stockfish, on_line=lambda line: print(f'{line}')
))
# await task
await stockfish.wait()
if sys.platform == "win32":
asyncio.set_event_loop_policy(
asyncio.WindowsProactorEventLoopPolicy())
asyncio.run(run_stockfish(), debug=True)
print('done')
All is blocked after first line (no print of eof or done):
C:\root\Python37-64\python.exe "C:/Users/Cezary
Wagner/PycharmProjects/cw_chess_uci/sandbox/async_proxy/s02_async_stockfish.py"
Stockfish 10 64 BMI2 by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
----------
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Python tracker <[email protected]>
<https://bugs.python.org/issue35268>
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