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#!/usr/bin/env python3
"""A simple utility to unpickle some code, run it, and pickle the
results.
"""
import logging
import os
import signal
import threading
import sys
import time
import cloudpickle # type: ignore
import psutil # type: ignore
import argparse_utils
import bootstrap
import config
from thread_utils import background_thread
logger = logging.getLogger(__file__)
cfg = config.add_commandline_args(
f"Remote Worker ({__file__})",
"Helper to run pickled code remotely and return results",
)
cfg.add_argument(
'--code_file',
type=str,
required=True,
metavar='FILENAME',
help='The location of the bundle of code to execute.'
)
cfg.add_argument(
'--result_file',
type=str,
required=True,
metavar='FILENAME',
help='The location where we should write the computation results.'
)
cfg.add_argument(
'--watch_for_cancel',
action=argparse_utils.ActionNoYes,
default=False,
help='Should we watch for the cancellation of our parent ssh process?'
)
@background_thread
def watch_for_cancel(terminate_event: threading.Event) -> None:
p = psutil.Process(os.getpid())
while True:
saw_sshd = False
ancestors = p.parents()
for ancestor in ancestors:
name = ancestor.name()
if 'ssh' in name.lower():
saw_sshd = True
break
if not saw_sshd:
os.system('pstree')
os.kill(os.getpid(), signal.SIGTERM)
time.sleep(5.0)
os.kill(os.getpid(), signal.SIGKILL)
sys.exit(-1)
if terminate_event.is_set():
return
time.sleep(1.0)
@bootstrap.initialize
def main() -> None:
in_file = config.config['code_file']
out_file = config.config['result_file']
logger.debug(f'Reading {in_file}.')
try:
with open(in_file, 'rb') as rb:
serialized = rb.read()
except Exception as e:
logger.exception(e)
logger.critical(f'Problem reading {in_file}. Aborting.')
sys.exit(-1)
logger.debug(f'Deserializing {in_file}.')
try:
fun, args, kwargs = cloudpickle.loads(serialized)
except Exception as e:
logger.exception(e)
logger.critical(f'Problem deserializing {in_file}. Aborting.')
sys.exit(-1)
logger.debug('Invoking user code...')
start = time.time()
ret = fun(*args, **kwargs)
end = time.time()
logger.debug(f'User code took {end - start:.1f}s')
logger.debug('Serializing results')
try:
serialized = cloudpickle.dumps(ret)
except Exception as e:
logger.exception(e)
logger.critical(f'Could not serialize result ({type(ret)}). Aborting.')
sys.exit(-1)
logger.debug(f'Writing {out_file}.')
try:
with open(out_file, 'wb') as wb:
wb.write(serialized)
except Exception as e:
logger.exception(e)
logger.critical(f'Error writing {out_file}. Aborting.')
sys.exit(-1)
if __name__ == '__main__':
main()
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