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feat: Upgrade proginit to version 1.3.0

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This commit is contained in:
Sven Sager
2023-10-11 21:03:08 +02:00
parent 8c2f66b2b5
commit d2be450d98
3 changed files with 250 additions and 41 deletions
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14
src/revpicommander/__main__.py
View File

@@ -17,14 +17,14 @@ if __package__ == "":
if __name__ == "__main__":
import sys
if len(sys.argv) == 2 and "--version" in sys.argv:
# Catch --version, if this is the only argument (sys.argv[0] is always the script name)
from revpicommander import __version__
print(__version__)
sys.exit(0)
else:
try:
# Use absolut import in the __main__ module
from revpicommander.revpicommander import main
# Run the main application of this package
sys.exit(main())
except Exception as e:
sys.stdout.write(f"Can not start __main__ module: {e}")
sys.stdout.write("\n")
sys.exit(1)

271
src/revpicommander/proginit.py
View File

@@ -1,45 +1,118 @@
# -*- coding: utf-8 -*-
"""Global program initialization."""
# SPDX-FileCopyrightText: 2018-2023 Sven Sager
# SPDX-License-Identifier: LGPL-2.0-or-later
__author__ = "Sven Sager"
__copyright__ = "Copyright (C) 2023 Sven Sager"
__license__ = "GPLv2"
__copyright__ = "Copyright (C) 2018-2023 Sven Sager"
__license__ = "LGPL-2.0-or-later"
__version__ = "1.3.0"
import logging
import sys
from argparse import ArgumentParser
from configparser import ConfigParser
from os import R_OK, W_OK, access
from os.path import abspath, dirname, join
from os import R_OK, W_OK, access, environ, getpid, remove
from os.path import abspath, dirname, exists, join
from shutil import copy, move
from socket import AF_UNIX, SOCK_DGRAM, socket
from threading import Event
try:
# Import program version from meta data module of your program
from . import __version__ as external_version
except Exception:
external_version = None
# Program name
programname = "revpicommander"
program_version = external_version
# Set to True, if you want to save config file
conf_rw = False
conf_rw = False # If you want so save the configuration with .save_conf() set to True
conf_rw_save = False # Create new conf file in same directory and move to old one
conf_rw_backup = False # Keep a backup of old conf file [filename].bak
_extend_daemon_startup_timeout = 0.0 # Default startup timeout is 90 seconds
conf = ConfigParser()
logger = logging.getLogger()
pidfile = "/var/run/{0}.pid".format(programname)
_daemon_started_up = Event()
_daemon_main_pid = getpid()
_systemd_notify = environ.get("NOTIFY_SOCKET", None)
if _systemd_notify:
# Set up the notification socket for systemd communication
_systemd_socket = socket(family=AF_UNIX, type=SOCK_DGRAM)
if _extend_daemon_startup_timeout:
# Extend systemd TimeoutStartSec by defined timeout extension in micro seconds
_systemd_socket.sendto(
f"EXTEND_TIMEOUT_USEC={_extend_daemon_startup_timeout * 1000000}\n",
_systemd_notify,
)
def can_be_forked():
"""
Check the possibility of forking the process.
Under certain circumstances, a process cannot be forked. These include
certain build settings or packaging, as well as the missing function on
some operating systems.
:return: True, if forking is possible
"""
from sys import platform
# Windows operating system does not support the .fork() call
if platform.startswith("win"):
return False
# A PyInstaller bundle does not support the .fork() call
if getattr(sys, "frozen", False) and hasattr(sys, "_MEIPASS"):
return False
return True
def cleanup():
"""Clean up program."""
"""
Clean up before exit the program.
This function must be called at the end of the program. It flushes
the logging buffers and deletes the PID file in daemon mode.
"""
if pargs.daemon and exists(pidfile):
remove(pidfile)
# Shutdown logging system
logging.shutdown()
# Close logfile
if pargs.daemon:
sys.stdout.close()
def reconfigure_logger():
"""Configure logging module of program."""
# Clear all log handler
for lhandler in logger.handlers.copy():
lhandler.close()
logger.removeHandler(lhandler)
if pargs.daemon:
# Create daemon log file
fh_logfile = open("/var/log/{0}.log".format(programname), "a")
# Close stdout and use logfile
sys.stdout.close()
sys.stdout = fh_logfile
sys.stderr = sys.stdout
# Create new log handler
logformat = logging.Formatter(
"{asctime} [{levelname:8}] {message}",
datefmt="%Y-%m-%d %H:%M:%S", style="{"
)
if pargs.verbose > 2:
log_frm = "{asctime} [{levelname:8}] {name} {message}"
else:
log_frm = "{asctime} [{levelname:8}] {message}"
logformat = logging.Formatter(log_frm, datefmt="%Y-%m-%d %H:%M:%S", style="{")
lhandler = logging.StreamHandler(sys.stdout)
lhandler.setFormatter(logformat)
logger.addHandler(lhandler)
@@ -60,53 +133,187 @@ def reconfigure_logger():
logger.setLevel(loglevel)
def reload_conf():
"""Reload config file."""
if "conffile" in pargs:
def reload_conf(clear_load=False) -> None:
"""
Reload config file.
After successful reload, call set_startup_complete() function to inform
systemd that all functions are available again.
If keys are commented out in conf file, they will still be in the conf file.
To remove not existing keys set clear_load to True.
:param clear_load: Clear conf before reload
"""
if _systemd_notify:
# Inform systemd about reloading configuration
_systemd_socket.sendto(b"RELOADING=1\n", _systemd_notify)
# Reset started up event for the set_startup_complete function
_daemon_started_up.clear()
if "conffile" in pargs:
# Check config file
if not access(pargs.conffile, R_OK):
raise RuntimeError("can not access config file '{0}'".format(pargs.conffile))
if conf_rw:
if (conf_rw_save or conf_rw_backup) and not access(dirname(pargs.conffile), W_OK):
raise RuntimeError(
"can not access config file '{0}'".format(pargs.conffile)
)
if conf_rw and not access(pargs.conffile, W_OK):
raise RuntimeError(
"can not write to config file '{0}'".format(pargs.conffile)
"can not wirte to directory '{0}' to create files"
"".format(dirname(pargs.conffile))
)
if not access(pargs.conffile, W_OK):
raise RuntimeError("can not write to config file '{0}'".format(pargs.conffile))
# Create global config
global conf
if clear_load:
# Clear all sections and do not create a new instance
for section in conf.sections():
conf.remove_section(section)
# Read configuration
logger.info("loading config file: {0}".format(pargs.conffile))
conf.read(pargs.conffile)
def save_conf():
"""Save configuration."""
if not conf_rw:
raise RuntimeError("You have to set conf_rw to True.")
if "conffile" in pargs:
if conf_rw_backup:
copy(pargs.conffile, pargs.conffile + ".bak")
if conf_rw_save:
with open(pargs.conffile + ".new", "w") as fh:
conf.write(fh)
move(pargs.conffile + ".new", pargs.conffile)
else:
with open(pargs.conffile, "w") as fh:
conf.write(fh)
def startup_complete():
"""
Call this when the daemon is completely started.
When a daemon is started, it may take some time for everything to be
available. This function notifies the init system when all functions of
this daemon are available so that the starts of further daemons can be
properly timed.
The systemd unit file that is supposed to start this demon must be set
to 'Type=notify'. If the daemon supports reloading the settings,
'ExecReload=/bin/kill -HUP $MAINPID' must also be set. The daemon must
call this function again after the reload in order to signal systemd the
completed reload.
If systemd is available from version 250 and the daemon supports reloading
the settings, 'Type=notify-reload' can be used without 'ExecReload'. The
type 'notify-reload' is preferable if possible, as the reloading of the
daemon is also synchronized with systemd.
If the '--fork' parameter is used, the main process ends after calling
this function to prevent the further start of demons by other init systems.
"""
if _daemon_started_up.is_set():
# Everyone was notified about complete start, if set
return
if _systemd_notify:
# Inform systemd about complete startup of daemon process
_systemd_socket.sendto(b"READY=1\n", _systemd_notify)
if pargs.daemon:
from os import kill
# Send SIGTERM signal to main process
kill(_daemon_main_pid, 15)
_daemon_started_up.set()
# Generate command arguments of the program
parser = ArgumentParser(
prog=programname,
description="Program description"
# todo: Add program description for help
description="Program description",
)
parser.add_argument("--version", action="version", version=f"%(prog)s {program_version}")
parser.add_argument(
"-f",
"--logfile",
dest="logfile",
help="save log entries to this file",
)
parser.add_argument(
"-f", "--logfile", dest="logfile",
help="Save log entries to this file"
"-v",
"--verbose",
action="count",
dest="verbose",
default=0,
help="switch on verbose logging",
)
parser.add_argument(
"-v", "--verbose", action="count", dest="verbose", default=0,
help="Switch on verbose logging"
)
# The __main__ script will process the version number argument
parser.add_argument("--version", action="store_true", help="Print version number of program and exit")
# If packed with opensource licenses, add argument to print license information about bundled modules
open_source_licenses = join(dirname(__file__), "open-source-licenses", "open-source-licenses.txt")
if exists(open_source_licenses):
parser.add_argument(
"--open-source-licenses",
action="store_true",
dest="oss_licenses",
help="print packed open-source-licenses and exit",
)
pargs = parser.parse_args()
# Process open-source-licenses argument, if set (only affects bundled apps)
if "oss_licenses" in pargs and pargs.oss_licenses:
with open(open_source_licenses, "r") as fh:
sys.stdout.write(fh.read())
sys.exit(0)
# Check important objects and set to default if they do not exists
if "daemon" not in pargs:
pargs.daemon = False
if "verbose" not in pargs:
pargs.verbose = 0
# Check if the program should run as a daemon
if pargs.daemon:
# Check if daemon is already running
if exists(pidfile):
logger.error("Program already running as daemon. Check '{0}'".format(pidfile))
sys.exit(1)
# Fork to daemon
from os import fork
pid = fork()
if pid > 0:
# Main process waits for exit till startup is complete
from os import kill
from signal import SIGKILL, SIGTERM, signal
# Catch the TERM signal, which will be sent from the forked process after startup_complete
signal(SIGTERM, lambda number, frame: _daemon_started_up.set())
# Use the default timeout of 90 seconds from systemd also for the '--daemon' flag
if not _daemon_started_up.wait(90.0 + _extend_daemon_startup_timeout):
sys.stderr.write(
"Run into startup complete timout! Killing fork and exit main process\n"
)
kill(pid, SIGKILL)
sys.exit(1)
# Main process writes pidfile with pid of forked process
with open(pidfile, "w") as f:
f.write(str(pid))
sys.exit(0)
# Get absolute paths
pwd = abspath(".")
# Configure logger
if "logfile" in pargs and pargs.logfile is not None \
and dirname(pargs.logfile) == "":
if "logfile" in pargs and pargs.logfile is not None and dirname(pargs.logfile) == "":
pargs.logfile = join(pwd, pargs.logfile)
reconfigure_logger()

2
src/revpicommander/revpicommander.py
View File

@@ -90,6 +90,8 @@ class RevPiCommander(QtWidgets.QMainWindow, Ui_win_revpicommander):
self.setWindowFlag(QtCore.Qt.WindowMaximizeButtonHint, False)
pi.startup_complete()
def closeEvent(self, a0: QtGui.QCloseEvent) -> None:
log.debug("RevPiCommander.closeEvent")
helper.cm.pyload_disconnect()