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import asyncio
import socket
import time
from typing import Iterable
def is_connectable(host, port):
sock = None
try:
sock = socket.create_connection((host, port), timeout=1)
except socket.error:
return False
else:
return True
finally:
if sock is not None:
sock.close()
def wait_until_connectable(host, port, timeout=10):
count = 0
while not is_connectable(host=host, port=port):
if count >= timeout:
raise Exception(
f'The proxy server has not available by ({host}, {port}) in {timeout:d} seconds'
)
count += 1
time.sleep(1)
return True
def cancel_tasks(tasks: Iterable[asyncio.Task], loop: asyncio.AbstractEventLoop):
if not tasks:
return
for task in tasks:
task.cancel()
loop.run_until_complete(asyncio.gather(*tasks, return_exceptions=True))
for task in tasks:
if task.cancelled():
continue
if task.exception() is not None:
loop.call_exception_handler(
{
"message": "unhandled exception during asyncio.run() shutdown",
"exception": task.exception(),
"task": task,
}
)
def cancel_all_tasks(loop: asyncio.AbstractEventLoop):
tasks = [task for task in asyncio.all_tasks(loop) if not task.done()]
cancel_tasks(tasks=tasks, loop=loop)
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