daemon-application 0.5.5

A simple python package for creating daemon applications.

daemon-application

Description

A simple python package for creating daemon applications.

Notice:

• Runs the application in daemon mode on Linux only. On Windows, the application runs in foreground model.

Install

pip install daemon-application

Usage

Example for raw APIs

import time
import threading
import signal
from daemon_application import daemon_start

stopflag = False

def main():
    def on_exit(*args, **kwargs):
        with open("backgroud.log", "a", encoding="utf-8") as fobj:
            print("process got exit signal...", file=fobj)
            print(args, file=fobj)
            print(kwargs, file=fobj)
        global stopflag
        stopflag = True
    signal.signal(signal.SIGTERM, on_exit)
    signal.signal(signal.SIGINT, on_exit)
    while not stopflag:
        time.sleep(1)
        print(time.time())

if __name__ == "__main__":
    print("start background application...")
    daemon_start(main, "background.pid", True)

Example for DaemonApplication

import time
from daemon_application import DaemonApplication

class HelloApplication(DaemonApplication):
    def main(self):
        while True:
            print("hello")
            time.sleep(1)

controller = HelloApplication().get_controller()

if __name__ == "__main__":
    controller()

Example for DaemonApplication adding new global options

import time
import click
from daemon_application import DaemonApplication

class HelloApplication(DaemonApplication):

    def get_main_options(self):
        options = [
            click.option("-m", "--message", default="hello")
        ]
        return options + super().get_main_options()

    def main(self):
        while True:
            print(self.config["message"])
            time.sleep(1)

controller = HelloApplication().get_controller()

if __name__ == "__main__":
    controller()

The output of the command help that added a new global option

Usage: example.py [OPTIONS] COMMAND [ARGS]...

Options:
  --pidfile TEXT          pidfile file path.
  --workspace TEXT        Set running folder
  --daemon / --no-daemon  Run application in background or in foreground.
  -c, --config TEXT       Config file path. Application will search config
                          file if this option is missing. Use sub-command
                          show-config-fileapaths to get the searching tactics.

  -m, --message TEXT
  --help                  Show this message and exit.

Commands:
  restart                Restart Daemon application.
  show-config-filepaths  Print out the config searching paths.
  start                  Start daemon application.
  stop                   Stop daemon application.

Note

Logging is not enabled by default, you may need to enable it at the first line of the main function using logutils.setup(**self.config).

Release

v0.5.5

• Config in DaemonApplication is set to the dictutils.Object class for ease use while remaining compatible with all dict operations.

v0.5.4

• Doc update.

v0.5.3

• Add DaemonApplication.load_config, so that you can start DaemonApplication service directly by your code.
• Add stop_timeout for daemon_stop. If stop timeout, kill process tree by force.

v0.5.2

• Add global options: loglevel, logfile, logfmt.
• Update default_config override mechanism.

v0.4.4

• Fix the problem in sub-command stop.

v0.4.3

• Deps on pyyaml.

v0.4.2

• Remove a print() statement.

v0.4.1

• Fix documents URLs.

v0.4.0

• Remove fastutils deps.
• Add --config global command option for DaemonApplication.
• Provide a way to override the global options for subclass of DaemonApplication.
• The sub-command restart will do just start if the old application is not running or crashed.
• Use gitee.com source code hosting service.

v0.3.3

• Fix show-config-filepaths.

v0.3.2

• Add click deps in requirements.txt

v0.3.1

• Add DaemonApplication.

v0.3.0

• New wrapper.

v0.2.1

• Old releases.