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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| # -*- coding: utf-8 -*- | ||
| """ | ||
| Python daemon implementation from: | ||
| http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/ | ||
| """ | ||
| import atexit | ||
| import os | ||
| import sys | ||
| import time | ||
| from signal import SIGTERM | ||
|
|
||
|
|
||
| class Daemon: | ||
| """ A generic daemon class | ||
| Usage: subclass the Daemon class and override the run() method | ||
| """ | ||
| def __init__(self, pidfile, stdin='/dev/null', | ||
| stdout='/dev/null', stderr='/dev/null'): | ||
| """ Constructor """ | ||
| self.stdin = stdin | ||
| self.stdout = stdout | ||
| self.stderr = stderr | ||
| self.pidfile = pidfile | ||
|
|
||
| def daemonize(self): | ||
| """ Do the UNIX double-fork magic | ||
| See Stevens' "Advanced Programming in the UNIX Environment" for | ||
| details (ISBN 0201563177) | ||
| http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16 | ||
| """ | ||
| try: | ||
| pid = os.fork() | ||
| if pid > 0: | ||
| # exit first parent | ||
| sys.exit(0) | ||
| except OSError as err: | ||
| sys.stderr.write( | ||
| "fork #1 failed: %d (%s)\n" % (err.errno, err.strerror)) | ||
| sys.exit(1) | ||
|
|
||
| # decouple from parent environment | ||
| os.chdir("/") | ||
| os.setsid() | ||
| os.umask(0) | ||
|
|
||
| # do second fork | ||
| try: | ||
| pid = os.fork() | ||
| if pid > 0: | ||
| # exit from second parent | ||
| sys.exit(0) | ||
| except OSError as err: | ||
| sys.stderr.write( | ||
| "fork #2 failed: %d (%s)\n" % (err.errno, err.strerror)) | ||
| sys.exit(1) | ||
|
|
||
| # redirect standard file descriptors | ||
| sys.stdout.flush() | ||
| sys.stderr.flush() | ||
| si = file(self.stdin, 'r') | ||
| so = file(self.stdout, 'a+') | ||
| se = file(self.stderr, 'a+', 0) | ||
| os.dup2(si.fileno(), sys.stdin.fileno()) | ||
| os.dup2(so.fileno(), sys.stdout.fileno()) | ||
| os.dup2(se.fileno(), sys.stderr.fileno()) | ||
|
|
||
| # write pidfile | ||
| atexit.register(self.delpid) | ||
| pid = str(os.getpid()) | ||
| file(self.pidfile, 'w+').write("%s\n" % pid) | ||
|
|
||
| def delpid(self): | ||
| os.remove(self.pidfile) | ||
|
|
||
| def start(self, *args, **kwargs): | ||
| """ Start the daemon """ | ||
| # Check for a pidfile to see if the daemon already runs | ||
| try: | ||
| pf = file(self.pidfile, 'r') | ||
| pid = int(pf.read().strip()) | ||
| pf.close() | ||
| except IOError: | ||
| pid = None | ||
|
|
||
| if pid: | ||
| message = "pidfile %s already exist. Daemon already running?\n" | ||
| sys.stderr.write(message % self.pidfile) | ||
| sys.exit(1) | ||
|
|
||
| # Start the daemon | ||
| self.daemonize() | ||
| self.run(*args, **kwargs) | ||
|
|
||
| def stop(self): | ||
| """ Stop the daemon """ | ||
| # Get the pid from the pidfile | ||
| try: | ||
| pf = file(self.pidfile, 'r') | ||
| pid = int(pf.read().strip()) | ||
| pf.close() | ||
| except IOError: | ||
| pid = None | ||
|
|
||
| if not pid: | ||
| sys.stderr.write( | ||
| "pidfile {0} does not exist. Daemon not running?\n".format( | ||
| self.pidfile)) | ||
| return # not an error in a restart | ||
|
|
||
| # Try killing the daemon process | ||
| try: | ||
| while 1: | ||
| os.kill(pid, SIGTERM) | ||
| time.sleep(0.1) | ||
| except OSError, err: | ||
| err = str(err) | ||
| if err.find("No such process") > 0: | ||
| if os.path.exists(self.pidfile): | ||
| os.remove(self.pidfile) | ||
| else: | ||
| print str(err) | ||
| sys.exit(1) | ||
|
|
||
| def restart(self): | ||
| """ Restart the daemon """ | ||
| self.stop() | ||
| self.start() | ||
|
|
||
| def run(self, check_interval=1): | ||
| """ | ||
| You should override this method when you subclass Daemon. | ||
| It will be called after the process has been | ||
| daemonized by start() or restart(). | ||
| """ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| [general] | ||
| version: 0.1.0 | ||
| version: 0.2.0 |