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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import os
import signal
import asyncio
import asyncio.subprocess
import logging
import setproctitle
from .logging import get_logger
# =====
async def run_process(
cmd: list[str],
err_to_null: bool=False,
env: (dict[str, str] | None)=None,
) -> asyncio.subprocess.Process: # pylint: disable=no-member
return (await asyncio.create_subprocess_exec(
*cmd,
stdout=asyncio.subprocess.PIPE,
stderr=(asyncio.subprocess.DEVNULL if err_to_null else asyncio.subprocess.STDOUT),
preexec_fn=os.setpgrp,
env=env,
))
async def read_process(
cmd: list[str],
err_to_null: bool=False,
env: (dict[str, str] | None)=None,
) -> tuple[asyncio.subprocess.Process, str]: # pylint: disable=no-member
proc = await run_process(cmd, err_to_null, env)
(stdout, _) = await proc.communicate()
return (proc, stdout.decode(errors="ignore").strip())
async def log_process(
cmd: list[str],
logger: logging.Logger,
env: (dict[str, str] | None)=None,
prefix: str="",
) -> asyncio.subprocess.Process: # pylint: disable=no-member
(proc, stdout) = await read_process(cmd, env=env)
if stdout:
log = (logger.info if proc.returncode == 0 else logger.error)
if prefix:
prefix += " "
for line in stdout.split("\n"):
log("%s=> %s", prefix, line)
return proc
async def log_stdout_infinite(proc: asyncio.subprocess.Process, logger: logging.Logger) -> None: # pylint: disable=no-member
empty = 0
async for line_bytes in proc.stdout: # type: ignore
line = line_bytes.decode(errors="ignore").strip()
if line:
logger.info("=> %s", line)
empty = 0
else:
empty += 1
if empty == 100: # asyncio bug
raise RuntimeError("Asyncio process: too many empty lines")
async def kill_process(proc: asyncio.subprocess.Process, wait: float, logger: logging.Logger) -> None: # pylint: disable=no-member
if proc.returncode is None:
try:
proc.terminate()
await asyncio.sleep(wait)
if proc.returncode is None:
try:
os.killpg(os.getpgid(proc.pid), signal.SIGKILL)
except Exception:
if proc.returncode is not None:
raise
await proc.wait()
logger.info("Process killed: retcode=%d", proc.returncode)
except asyncio.CancelledError:
pass
except Exception:
if proc.returncode is None:
logger.exception("Can't kill process pid=%d", proc.pid)
else:
logger.info("Process killed: retcode=%d", proc.returncode)
def rename_process(suffix: str, prefix: str="kvmd") -> None:
setproctitle.setproctitle(f"{prefix}/{suffix}: {setproctitle.getproctitle()}")
def settle(name: str, suffix: str, prefix: str="kvmd") -> logging.Logger:
logger = get_logger(1)
logger.info("Started %s pid=%d", name, os.getpid())
os.setpgrp()
rename_process(suffix, prefix)
return logger
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