mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-11-22 20:31:31 +00:00
59 lines
2.0 KiB
Python
59 lines
2.0 KiB
Python
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from subprocess import PIPE, Popen
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from functools import partial
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from os import getpgid, killpg
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from os.path import join
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from signal import SIGTERM
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from secrets import token_urlsafe
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from threading import Thread
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from contextlib import suppress
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from pipe_io_server import terminate_process_on_failure
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from .pipe_io_handler import PipeIOHandler, DEFAULT_PERMISSIONS
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class CommandHandler(PipeIOHandler):
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def __init__(self, command, permissions=DEFAULT_PERMISSIONS):
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super().__init__(
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self._generate_tempfilename(),
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self._generate_tempfilename(),
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permissions
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)
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self._proc_stdin = open(self.pipe_io.out_pipe, 'rb')
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self._proc_stdout = open(self.pipe_io.in_pipe, 'wb')
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self._proc = Popen(
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command, shell=True, executable='/bin/bash',
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stdin=self._proc_stdin, stdout=self._proc_stdout, stderr=PIPE,
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start_new_session=True
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)
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self._monitor_proc_thread = self._start_monitor_proc()
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def _generate_tempfilename(self):
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# pylint: disable=no-self-use
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random_filename = partial(token_urlsafe, 10)
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return join('/tmp', f'{type(self).__name__}.{random_filename()}')
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def _start_monitor_proc(self):
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thread = Thread(target=self._monitor_proc, daemon=True)
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thread.start()
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return thread
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@terminate_process_on_failure
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def _monitor_proc(self):
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return_code = self._proc.wait()
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if return_code == -int(SIGTERM):
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# supervisord asked the program to terminate, this is fine
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return
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if return_code != 0:
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_, stderr = self._proc.communicate()
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raise RuntimeError(f'Subprocess failed ({return_code})! Stderr:\n{stderr.decode()}')
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def cleanup(self):
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with suppress(ProcessLookupError):
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process_group_id = getpgid(self._proc.pid)
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killpg(process_group_id, SIGTERM)
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self._proc_stdin.close()
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self._proc_stdout.close()
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super().cleanup()
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