1 files changed, 63 insertions, 0 deletions
diff --git a/daemon_example.py b/daemon_example.py
new file mode 100755
index 0000000..0eb3a7f
--- /dev/null
+++ b/daemon_example.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""Example on how to create a daemon.
+
+If you are confused on how the daemon library works you can get some ideas
+from the tests.
+
+https://pagure.io/python-daemon/blob/master/f/test/test_runner.py
+"""
+from logging import FileHandler, Formatter, getLogger, info
+from os import fork, setsid, getpid
+from sys import exit
+from time import sleep
+
+
+class MyDaemon(object):
+    """Daemon class. Not for production use, example only."""
+
+    def __init__(self):
+        """Initialize the paths and the pidfile of the daemon."""
+        self.stdin_path = '/dev/null'
+        self.stdout_path = '/dev/null'
+        self.stderr_path = '/dev/null'
+        self.pidfile_path = '/var/run/python_daemon.pid'
+
+    def create_pidfile(self):
+        with open(self.pidfile_path, mode='w', encoding='utf-8') as a_file:
+            a_file.write(str('{}\n'.format(self.pid)))
+
+    def detach_process(self):
+        """Simple method for daemonizing process."""
+        newpid = fork()
+        if newpid > 0:
+            exit()
+        else:
+            setsid()
+            newpid = fork()
+            if newpid > 0:
+                exit()
+            else:
+                self.pid = getpid()
+                self.create_pidfile()
+                return
+
+    def run(self):
+        """Entrypoint for the daemon."""
+        self.detach_process()
+        # Setup logging
+        log = getLogger()
+        handler = FileHandler('/var/log/python_daemon.log')
+        formatter = Formatter('%(asctime)s %(levelname)s %(message)s')
+        handler.setFormatter(formatter)
+        log.addHandler(handler)
+        log.setLevel('INFO')
+        while True:
+            info('I am alive')
+            sleep(1)
+
+
+# run the daemon
+if __name__ == '__main__':
+    daemon = MyDaemon()
+    daemon.run()